5091 5095.output

* GB785498 (A)

Description: GB785498 (A) ? 1957-10-30

Spray booth

Description of GB785498 (A)

PATENT SPECIFICATION -78 t 1 Date of Application and filing Complete Specification: September 13, 1955. No 26236/55 Application made in Sweden on September 14, 1954. Complete Specification Published: October 30, 1957. Index at acceptance:-Class 95, B 2 H. International Classification:-BOS. COMPLETE SPECIFICATION Spray Booth We, SVENSKA LUFTFILTER AKTIEBOLAGET, of Skoldingevigen 12, Alvasjd, Sweden, a Swedish Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:This invention relates to a spray booth of the kind from which ventilation air is exhausted and which for the purpose of retaining and removing excess paint is provided with overflow devices, nozzles or the like in known manner The spray booth according to the invention is characterised by means for conveyance by the exhausted air of water as drops or droplets from the bottom of the booth to retainers situated in an exhaust air duct above said overflow devices or nozzles, from which retainers the water flows by gravity to said overflow devices or nozzles. This construction has many advantages. A circulation pump for the water is not necessary Due to the pneumatic transport of the water, which should be effected through ducts of much greater section than the tubes for a circulation pump for the water, the danger of clogging from the paint in the water is almost eliminated. These and other advantages of the invention and the characteristics thereof will be clear from the following description of an embodiment,

mainly in connection with the accompanying drawings, as follows: Fig 1 shows a vertical middle section of a spray booth according to the invention, taken along the line I of Fig 2. Fig 2 is a front view of the booth with the front cover removed. Fig 3 shows a vertical section taken along the line III of Fig 1. Fig 4 shows a section similar to that of Fig 1 with a modified embodiment of the upper part of the booth. Fig 5 shows essentially the same section as Fig 1 with an indication of the movements of air and water and the levels of the water during operation. In all the figures corresponding parts have 50 the same reference numerals In Fig 5 the reference numerals principally refer to the air and the water, whereas the reference numerals of the parts are omitted with a few exceptions for the sake of clearness, 55 and also some parts of the booth which have no direct influence on its operation. With reference to Figs 1 3, the spray booth comprises a chamber 1 2, the upper part 1 of which is the paint-spraying cham 60 ber, and the lower part 2 essentially forms the water basin The latter, however, can be made as a separate bottom part upon which the booth can be erected. The chambers 1 2 are formed by a rear 65 wall 3, two side walls 4 and 5, a bottom 6 with a foot frame 7 and a cover 8 A lower part 9 of the front side is inclined and forms the front side of the basin 2. Above this front side 9 is a detachable 70 front cover 10, and above this cover is the operating opening 11, which is suitably surrounded by a profiled frame 12, having an edge directed inwardly The frame 12 should be inclined somewhat backwards ac 75 cording to the drawing; this inclination gives a certain advantage which will be described later. For the objects to be sprayed the chamber 1 has a mounting table 13, the size of 80 which can be adapted to the objects to be sprayed It can be made as a plate resting on bars or tubes connecting the side walls 4 and 5, or in known manner it can be entirely or partly constructed as a turntable 85 From the upper part of the rear side 3 there is a plate 14 extending downwards with a slight inclination inwards Most of the water flows down this plate Above the operating chamber 1 there are a first water 90 5,498 785,498 collecting chamber 15 and a second water collecting chamber 16 By means of a duct 17 at the rear of the rear wall the first collecting chamber 15 is in communication with the chambers i 2 On its rear side the duct 17 is provided with inspection and cleaning doors 18 At the bottom the duct 17 turns upwards at 19 passing the rear wall 3 and terminates inside the booth in an opening 20 Inside the booth the duct 17 is provided with a horizontal slot 21 on its rear side, the lower edge of which

essentially corresponds with the water surface in the basin 2 In front of the opening 20 of the duct 17 there is a screen 22, which extends between the side walls 4 and 5. The upper part of the screen is curved backwards and has a depending edge, as shown in the drawing Between the rear edge of the screen 22 and the rear wall 3 there is a slot 23, through which the air can be exhausted from the operating chamber 1. At the top the duct 17 terminates in the first collecting chamber 15 in an opening 24 (See also Fig 3) The collecting chamber 15 has a bottom 25, part of which is inclined as shown in the drawing A water baffle 26 is contained in this chamber, which baffle separates and retains the droplets which may remain suspended in the air and returns this water to the chamber 15 The space behind the baffle 26 is connected to an exhaust duct 27, which may be connected to an exhaust fan 28 (Fig 5). The front side of the first collecting chamber 15 has an inspection door 29 The bottom 25 is apertured for an overflow 30, and according to the drawing it consists of a vertical tube with a cap above it. The second collecting chamber 16 is in direct communication with the operating chamber 1, as will be understood from the drawing and the following description, and even when the booth is in operation there is no air pressure difference between the chambers 16 and 1. The chamber 16 may also be in direct communication with the surrounding air in such manner that the rear wall 3 ends in front of the bottom 25 forming openings 31 at each side of the duct 17 as shown by dot and dash lines in Fig 3 These openings may be covered by easily detachable lids or doors. The bottom of the second collecting chamber 16-is formed by a collecting trough 32 with turned-down overflow edges 33. Between the outer boundary 34 of the edge and the upper part of the plate 14 (Fig 1) and the walls 4 and 5 (Fig 3) communication is provided by a slot 35 through which the water can flow The trough 32 is suspended by bars 36 from the bottom and fixed at the front side of the chamber 15 by fixing means 37 The latter may be adjustable for adjusting the breadth of the different parts of the slot 35. For emptying the chamber 15 and the trough 32 draining plugs 38 are provided. The basin 2 is provided with a drain open 70 ing 39 at the bottom and an overflow 40 at the surface of the water For the supply of water from the main a float valve 41 may be used, indicated by dot and dash lines in Fig 3 As a complement to the 75 float valve a hand valve tap for rapidly filling the basin can be provided These details being well known to those skilled in the art are not shown in the drawings. The construction according to fig 4 dif 80 fers from that according to

Fig 1 3 only in the size of the chambers 15 and 16. According to Fig 4 these chambers cover the whole upper side of the booth, permitting a greater part of the side walls to be 85 made wet than in the construction according to Figs 1 3 However, by connecting lateral gutters to the trough 32 in this latter construction it is possible for the front parts of the side walls 4 and 5 to be made wet 90 The operation of the spray booth is shown in Fig 5, in which the path of the air is indicated by full, even lines 42 with arrow points, showing the direction of travel of the air Collected water is indicated by hori 95 zontal dashes, partly in the basin, 43, partly in the first and second collecting chambers, 44 and 45 and partly in the overflow, 55. Water in jets or in greater or smaller drops and water conveyed pneumatically by 100 the air flow is indicated by small rings 4650, 53, 54 and water pouring along the surfaces in films by irregular wavy lines 51 and 52. When the booth is to be used for the first 105 time, the basin 2 is filled with water to the level determined by the float valve and the overflow During normal operation the water loss is very small and consists mainly of the quantity of water required for hum 110 idifying the exhaust air A float valve for the make up water may therefore be of small dimensions. In the trough 32 water 45 is filled until its surface is slightly above the under edge 115 of the overflow 30, making a water lock. For this filling the booth is provided with a filling pipe for the trough 32, which pipe is not shown in the drawing. When the fan 28 is started, air streams 120 into the booth by the opening 11 as shown by the three lines 42 The air passes further through the opening between the lower edge of the plate 14 and the screen 22 and through the slot between the rear edge of 125 the screen 22 and the rear wall 3 The space behind the screen 22 forms a suction chamber, from which the air streams into the duct 19, 17 through its opening 20 At the same time the air draws water 47 from 130 Depending on the kind of paint the impur 60 ities can either form as sediment on the bottom of the basin 2 or agglomerate on the water surface The screen 22 prevents such agglomerations from entering the duct 17 The spray booth can be combined with 65 other means for purifying the water. The sloping of the front side frame 12 of the operating opening 11 mentioned above makes for a uniform air velocity through the operating chamber 1 With a vertical 70 frame the path of air is greater upwards than downwards from the opening to the passage below the plate 14 In booths with a ver tical opening and suction on the bottom the upper part of the operating chamber is bad 75 ly ventilated.

The embodiment according to the foregoing description can be modified in many ways. The slots 21 and 35 can be replaced by 80 other kinds of apertures. The screen 22 can be extended downwards towards the bottom 6 or down to the bottom, part of it being provided with a net work for retaining the impurities 85 The overflow 30 may be constructed in many different ways as known by those skilled in the art. The first chamber 15 can be equipped with a water filling pipe, whereby the two 90 chambers 15 and 16 can be supplied simultaneously. The duct 17 need not necessarily have a bend at the bottom It can pass through the rear wall 3 from above and have its 95 lower end immersed in the water 43 If so, the duct walls should be provided with apertures at the end, the size of which apertures should increase downwards. Instead of or together with overflows such 100 as those described above, nozzles and the like can be used for wetting in known manner Nozzles, however, require higher water pressure for proper operation than overflows, and the higher pressure can be obtain 105 ed by placing the devices for retaining the suspended water drops in the exhaust air above the booth.

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* GB785499 (A)

Description: GB785499 (A) ? 1957-10-30

A framing of beams of concrete and a method of manufacturing the saidframing


PATEN SPECFCATION

785 Date of Application and filing Complete Specification: ' fi | September 14, 1955. No 26344/55. Application made in Sweden on September 17, 1954. Complete Specification Published: October 30, 1957. 4 A 99 Index at acceptance:-Class 20 ( 4), D(I 1: 18). International C Iagsfication:-E 14 f. COMPLETE SPECIFICATION A Framing of Beams of Concrete and a Method of Manufacturing the said Framing I, Fome FREDRIK BRODEN, a subject of the King of Sweden, of 11, Hoganasvagen, Johaneshov, Sweden, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to concrete structures which are supported by or having reinforced concrete beams as part of the structure and arranged at suitable intervals. The present invention is concerned with the form of reinforcement and is characterised in that the reinforcement of the concrete beams consists of longitudinally extending reinforcement elements centrally arranged respectively at the top and the bottom of the beam, the said reinforcement elements being inter-connected by means of vertical or substantially vertical members placed at suitable intervals, each of the said members having a portion extending below the lower reinforcement element. The invention also relates to a method of manufacturing a beam supported concrete structure in which the individual beams are each provided with the said reinforcement. The method of this invention is characterised in that the longitudinal reinforcements, of which the upper one preferably consists of a T-shaped or other section girder and the lower one of round bars, are suspended in position for the fraining to be set up, and that a support-board or like shuttering material is applied on a wedge going through the extended portion of the vertical reinforcement member, after which insulating slabs, which are somewhat smaller than the distance separating said members, are placed on the support-board, and that concrete or the like is cast between the insulating slabs and on the insulating slabs and the beams, suitable additional reinforcement wires being applied on the insulating slabs and the beams. According to the invention an additional support or wedge is provided above the wedge in the extended portion of the vertical reinforcement element, against which 50 support the upper side of the carrying slab rests, so that the slab is pressed against the support, when the wedge is forced into position. The invention is illustrated in the accom 55 panying drawing in

which:Figure 1 is a transverse sectional view of a concrete structure or frame work provided at intervals with reinforced concrete beams, two such beams being shown in the draw 60 ing. Figure 2 is a side elevation showing separately the reinforcement means for the individual beam structures. In the drawing there is shown at S part 65 of a concrete structure e g a floor or roof provided at intervals with supporting beams, also of concrete, suitably reinforced and two of which beams indicated at B, B', are shown in Figure 1, these beams B, B' be 70 ing formed integrally with the structure S. The present invention is concerned with the reinforcement of the support beams B, B' and consists of a metal girder or strip indicated at 2 which conveniently is of T 75 section In addition to the upper reinforcement 2 there are provided two reinforcing rods 3 arranged in a plane parallel to the horizontal plane of the T girder and arranged symmetrically beneath the same 80 The upper and lower reinforcements 2 and 3 respectively are interconnected by means of vertically arranged metal plates or strips 4 which are arranged at intervals along the length of the concrete beam and 85 may be provided at the same or varying intervals as indicated at 4, 4 ', 4 " The metal blades or bands 4, 4 ' are united, such as by welding to the web of the T girder 2 and on their opposite sides to the rods 3 The 90 2 785,499 length of the bands 4 is such that they project below the underside of the concrete beam B (when finished) so as to provide an extension 5, the extension 5 having slots to receive a wedge member 6 to support a longitudinally extending piece of boarding or shuttering 7 It wvill be understood that the slot in the extension 5 is spaced from the round bars 3 a distance sufficient to ensure that when the concreting has been finished, the rods 3 are properly embedded in the concrete and an appreciable distance from the face of the mould board 7 which determines the underside of the beam B. In order to brace the board 7 the hole for the wedge 6 may be elongated so that an additional wedge or support 8 (see Figure 2) can be introduced into the slot on the upper side of the board 7, so that the latter when the wedge is driven into the slot, is pressed against the upper wedge or support 8. When the boards 7 are in position they provide a support for a slab 9 of insulating material which may be formed e g of wood wool It will be noted that the outermost sides of the slabs are bevelled so as to provide a tapering surfaces to fit snugly against the concrete beam structure B In practice the panels 9 may be held in position by a suitable support. It will be appreciated that the floor structure S may be suitably reinforced and certain of the reinforcement rods or metal work are carried lengthwise throughout the entire structure where they may be

located directly above the T section metal girders 2 as indicated at 11 After the shuttering including the support-board 7 and insulating slabs 9 is finally positioned the concrete is run into the shuttering so as to fill up the voids and thus produce the complete concrete structure, S, and its reinforcement beams B, B' as indicated in Figure 1. When the concrete has hardened sufficiently in order to remove the boards 7, (when the framing has been finished) it is sufficient to loosen the wedge 6 The end portion 5 of the band iron can now be cut off, and finally the concrete surface between the insulating slabs 9 is polished, if necessary. The invention is not restricted to the embodiment shown, but the details may be varied within the scope of the invention. The longitudinal reinforcing irons may have any cross-section The support 8 may be dispensed with The vertical reinforcement bands may be interconnected, for example by means of diagonal stays The lower portion of the band may be replaced by 60 staples or the like attached to the band iron or the reinforcing irons.


* GB785500 (A)

Description: GB785500 (A) ? 1957-10-30

Improvements relating to multi-twist textile cabling spindle with doublingflyer


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BE539688 (A) CH333872 (A) DE962411 (C) NL94201 (C)

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The EPO does not accept any responsibility for the accuracy of data and information originating from other authorities than the EPO; in particular, the EPO does not guarantee that they are complete, up-to-date or fit for specific purposes.

PATENT SPECIFICATION 785,500 Date of Application and filing Complete Specification: September 15, 1954. No 26458/55. Application made in Germany on September 18, 1954. Complete Specification Published: October 30, 1957. Index at acceptance:-Class 120 ( 2), D 2 B 2, D 2 G( 3 A 1: 3 D: 3 F 3: SC: SE). International Classification:-DO 2 d,. COMPLETE SPECIFICATION Improvements relating to Multi-twist Textile Cabling Spindle with Doubling Flyer We, BARMER MASCHINENFABRIK ATKIENGESELLSCHAFT, of Wuppertal-Elberfeld, Germany, a body corporate organised under the laws of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to a multi-twist textile cabling spindle which is adapted for use in the manufacture of multi-twist yarn, for example cord-twist yarn, and has a rotatable doubling flyer arranged above the supply bobbin and adapted to be entrained by the yarn. Multi-twist textile cabling spindles with such doubling flyers are known The doubling flyer has an eye projecting beyond the withdrawal diameter of the supply bobbin and this causes a better detachment of the individual yarns to be twisted (which in many cases have already been initially twist ed) from the bobbin than is otherwise possible and, in addition, satisfactorily compensates for the fluctuations in tension which result from the angle formation in the run of the yarn, caused by its lag However, defects in the twist or cabling are frequently found, particularly in the production of strong multiple twists, this often being the case with high bobbins and with overhead withdrawal; these defects are caused by the fact that the individual doubled yarns are not always juxtaposed in the same manner prior to

the twisting, as occasionally one yarn jumps over the yarn preceding or following it, and thus causes subsequent irregular twisting leading to non-uniform yarn strength With high bobbins, the position is aggravated by the fact that the doubled yarns easily roll relatively to one another when withdrawn from the lowest layers so that a changing false twist is superimposed on the cable formation; this also results in (Price 3 s 6 d) defective quality. An object of the present invention is to obviate the defects hereinbefore set forth. The invention provides a multi-twist textile cabling spindle with a rotatable doub 50 ling flyer arranged above a supply bobbin, wherein there is arranged between a threadguiding eye of the doubling flyer and a yam run-in section of the spindle a tension compensating member over which yarns with 55 drawn from the supply bobbin can be individually guided separately from one another The doubling flyer is preferably double-sided and provided on each side with a compensating member which projects into 60 the path of the thread between the yarnguiding eye of the doubling flyer and the yarn inlet into the spindle The threads are reliably guided and the compensating member is so shaped that several yarns are 65 guided in position spaced from one another. The compensating member is extremely inexpensive to manufacture and simple to manipulate. A preferred embodiment of the invention 70 is shown in the accompanying drawings in which: Figure 1 illustrates a doubling flyer of a multi-twist cabling spindle with a bowshaped compensating member arranged on 75 it, Figure 2 is a view of the bow-shaped compensating member in elevation transversely of the path of the yarn, Figure 3 is a side elevation of the same 80 compensating member, and Figure 4 is a fragmentary elevation in the direction of the arrow A (Figure 1). As shown in the drawing, three yarns 1, 2 and 3 withdrawn from a supply bobbin 85 4 travel together in a yarn-guiding eye 5, of a doubling flyer 6 and are thereafter guided out of the normal axis 7 of the yarn on the path between the thread-guiding eye 5 and the yarn passage of a yarn run-in sec 90 785,500 tion 8 of the spindle by means of a bowshaped compensating member 9 which is preferably of hard chromium plated and polished steel wire, each separate yarn being laid over the compensating member in such manner that the yarns are always arranged in the same relation to one another. For this purpose, the compensating member 9 comprises two inwardly bowed portions 10 and 11 and one outwardly bowed portion 12 on which the yarns 1, 2, and 3 bear as shown in Figure 2 Where there is a possibility of the yarn 3 slipping off, another inwardly bowed portion

may be provided in place of the outwardly bowed portion 12. It is also possible for the supporting bows to be replaced by straight supports if the distance between the yarn-guiding eye 5 and yarn run-in section 8 is sufficiently small in relation to the spacing of the three straight supports from the yarn axis 7 that the possibility of one individual yarn running over into the zone of the adjacent yarn is avoided Supporting arms 13 of the compensating member 9 are fixed on the doubling flyer 6 by means of a clip 14 and a screw 15 in such manner that the radial position of the compensating member 9 with respect to the axis of the spindle can be adjusted. When the tension of one of the yarns, for example, the yarn 3, is temporarily lower than that of the other two yarns 1 and 2, it will slide on the portion 12 towards the left or right of the position shown in Figure 2, depending on direction or rotation. As a result of this movement, it assumes a longer path between the eye 5 and the runin section 8 and it is thus as before sufficiently tensioned for a smooth run-in into the section 8 A similar action can also occur with the yarns 1 and 2, except that these yarns slide downwardly of the position shown in Figure 2 as the length increases. This change in the tension differences of the yarns is always only temporary and is generally of comparatively short duration Each of the three yarns will participate in these fluctuations of tension Since however all yarns are wound from the supply position with the same length, no separate yarn residue will remain after such a supply bobbin has become exhausted The temporary differences in length and tension are therefore compensated for by bow-shaped member 9 and a smooth run into the section 8 is obtained. It is obviously possible to make the compensating member of a material other than steel wire It can also have a different form, for example, that of a flat structure and can also be fixed in a different manner If it is a flat structure it may, for example, be constructed as a triangular surface with an edge fitting of porcelain, glass, wear-resisting plastics or other suitable material The 65 compensating member may instead of being secured to the doubling flyer by the screw 15, be a push fit thereon or may be soldered, or brazed The compensating member may also be used when twisting only two 70 or four, five or more yarns The number of bearing bowed surfaces or straight surfaces depends on the number of threads.

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* GB785501 (A)

Description: GB785501 (A) ? 1957-10-30

Improvements relating to a fan provided with a diffuser


PATENT SPECIFICATION Date of Application and filing Complete Specification: September 16, 1955. No 26537/55. Application made in Hungary on December 22, 1954. Application made in Hungary on March 1, 1955. Complete Specification Published: October 30, 1957. 785501 Index at acceptance:-Classes 4, R; and 110 ( 1), 12 J. International Classification:-F 04 d. COMPLETE SPECIFICATION Improvements relating to a Fan provided with a Diffuser We, 'LICENCIA" TALALMANYOKAT ERTEKESITO VALLALAT, of 10, J Mzsef nddor-tdr, Budapest V, Hungary, a Hungarian body corporate, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- With machines operating with gases or liquids having a high velocity of flow, such, for instance, as turbines, fans and the like, it is known to use on the outflow side pipe lines, the cross section or diameter of which is greater than the cross section or diameter of the outlet aperture of the machine In order to diminish the outlet losses caused by the kinetic energy of the operative medium leaving the machine, it has already been proposed to provide diffusers, that is pipe lines widening in the direction of flow between the said outlet apertures of smaller cross section and the leading away pipe lines of greater cross section. It is also known that the aperture angle of such diffusers may not exceed 8 to 12 ' for the purpose of ensuring a still admissible

efficiency Such small angles, however, necessitate a correspondingly great length of the diffuser, if the outlet loss is to be reduced within a practically sufficient amount. If, however, for any reason the use of a long diffuser is not permissible, it will then be necessary either to reduce its outlet cross section or to enlarge the aperture angle One of these two expedients must be adopted in those cases, in which for technical reasons a short diffuser pipe must be used Through the reduction of the outlet cross-section the outlet losses are increases and the enlargement of the aperture angle above 12 has the disadvantage, that the flowing medium will not fill the diffuser completely and will break away from its walls, so that the desired reduction of the velocity of flow will not take place In order to avoid this disadvantage, it has already been proposed to suck the boundary layer from the diffuser wall or to provide guiding surfaces or guiding rings in the diffuser. The invention is characterised by the 50 feature, that the diffuser is constructed as a double-walled hollow body, the hollow space of which connects the pressure space of the fan with its suction space by way of openings formed in the inner wall of the 55 diffuser, which are suitable for conveying away the boundary layer This arrangement provides this advantage among others, that no separate fan has to be provided for sucking off the boundary 60 layer attaching itself to the inner wall of the diffuser. Three constructional examples of the invention are illustrated in the accompanying drawing, in which 65 Figs 1 and 2 are each an axial section of a constructional form together with the fan and Fig 3 shows an axial section through the diffuser only 70 In all the Figures the same constructional parts bear the same reference numeral. In the constructional form according to Fig 1 of the drawing 1 is a fan which delivers the air in the direction of the arrow 75 2 is the inner wall of the diffuser, the outer wall of which is formed by a casing 4 which is arranged at such a distance from the inner wall 2 that between the two walls a hollow space 5 is left free, which acts 80 as an offtake channel This hollow space 5 is in communication by way of annular slits 3 in the inner wall 2 with the pressure space and by way of its lower open end 22 with the suction space of the fan 1 By this 85 means there is created in the hollow space a flow of air directed in the sense of the arrow 21 through the fan 1 itself, which conveys the air, and the boundary layer forming at the inner wall of the diffuser is con 90 795,501 tinuously removed through the slits 3. For enabling the amount of air drawn by suction from the diffuser through the hollow space 5 to be regulated, there is provided in the constructional form illustrated in Fig.

1 at the lower end of the diffuser body 2 in a circular groove 23 an annular body 6 which can be raised and lowered by means of adjusting members (not shown), whereby the free cross-section of the hollow space 5 can be enlarged or diminished at the place 7. In order with fans of large dimensions to prevent or reduce the detrimental eddy formation produced behind the fan hub, it is known to provide behind the hub a spinnerlike extension which consists substantially of a hollow body of streamlined shape At this extension as well a boundary layer forms from the through-flowing air, which must also be removed For this purpose, according to the invention there are provided in the wall of the hollow hub extension apertures which connect the pressure space behind the fan by way of channels in the fan hub with the suction space in front of the fan. In the constructional example according to Fig 1 there is provided in the direction of flow of the air conveyed by the fan behind the hub of the fan an extension 9 which has the form of a streamlined hollow body The wall of the extension 9 is divided up by coaxial slits 10, the separate parts being held together by ribs 11 which are fixed to the separate sections of the extension. In the constructional forms of the arrangement according to the invention illustrated in Figs 1 and 2 the extension in the form of a hollow body is rigidly connected to an annular part 13 of the fan, so that the extension 9 will rotate with the fan By this means, in contradistinction to the known arrangements with an extension connected to the diffuser, the advantage is obtained, that the supporting elements connecting the extension with the diffuser which are costly parts of an installation and heavily stress the diffuser wall are eliminated Consequently, in arrangements according to the invention the wall of the diffuser can be made relatively thin. is the fan shaft, on which the fan 1 is mounted by means of hub ring 12 or the like with a driving fit Between this inner hub ring 12 and the outer ring 13 supporting the hollow extension 9 and the fan vanes spokes 14 are provided as connecting members of the two rings The channels between the spokes 14 guide the air from the interior of the hollow extension 9 to a slit 17 which is formed below the fan hub between a tubular, stationary part 16 of the fan and the outer ring 13 and is in communication with the suction space of the fan. The air sucked off the outer wall of the hollow extension 9 flows in the direction of the arrows 24 In order to be able to regulate the amount of air sucked off in this 70 manner, there is provided in the interior of the stationary part 16 of the fan an anular regulating member 18 which can be raised and lowered by an adjusting mechanism (not shown in the drawing) whereby the free 75 cross-section of the slot 17 can be diminished or increased.

The constructional form shown in Fig. 2 differs from that of Fig 1 in this, that in the diffuser wall in place of the slits 3 80 there are provided as sucking off apertures for the material forming the boundary layer coaxially arranged rows of holes 27 The air passes through these holes into the hollow space 5 and thence through the aper 85 ture 8 into the suction space in front of the fan The freci cross-section of the aperture 8 into the lower end of the diffuser 2 can be regulated by means of one or more segments 25 which are adjustable by hand 90 levers 26. In the diffuser widening in the direction of flow the pressure of the flowing medium increases with the distance from the fan. Consequently, the pressure difference be 95 tween these pressures and the pressure on the suction side of the fan will also increase in the axial direction with the distance from the fan In order, nevertheless, to keep the quantity of sucked away air at a constant 100 most favourable value, to be ascertained by experiments, it is of advantage to let the free cross-section of the sucking off openings decrease in the direction of flow, that is to reduce the diameter of the holes 105 (Fig 2) or the number of the sucking off apertures. With the same object, in the constructional form according to Fig 1 the width of slit of the apertures 3 in the diffuser wall 110 may be diminished as the distance from the fan increases. In the constructional form according to Fig 3 the outer wall 4 of the diffuser is composed of concrete, whilst the inner wall 115 2 consists of perforated sheet metal and is anchored in the concrete wall by means of stay bolts 19 which also act as distance pieces In general it is of advantage to construct a casing of the double walled dif 120 fuser out of sheet metal The solid framework is then formed by the second casing made of concrete or the like, which carries or supports the first casing. The invention makes possible the con 125 struction of short diffusers, operating however with good efficiency with an aperture angle up to about 90-180 The invention is thus applicable with advantage in the case of fan installations of very great dimensions, 130 dimensions, characterised by the feature that one of the two walls forming the double walled diffuser is constructed of sheet metal.


* GB785502 (A)

Description: GB785502 (A) ? 1957-10-30

Spring group and damping mechanism assembly


PATENT SPECIFICATION Date of Application and filing Comnplete Specification October 7, 1955. No 28649155. Application mzade in United States of Anierica on January 31, 1955. Com 7 plete Specification Published: October 30, 1957. Index at acceptance:-Classes 103 ( 6), B 5 C( 2 D: 3: X); and 108 ( 3), 510 A. International Classification:-B 61 f F 06 f. COMPLETE SPECIFICATION Sprinlg Group aid dam-iping Mechiaiiismi Assembly -W r PATE 1 NTS ACTJI 94 l -cnnd meniber in SPECIFICATION h'O 785, 50 p In pursuance of Section 8 of the Patents Act, 1949, the Specification has been amended in the following manner:Page 4, after line 74, insert "The subject-matter of claim 1 of our Specification No 771,642, whvlich was published after the date of filing the present Complete Specification comprises a combined spring group and damping mechanism for a railway car truck having load supporting springs between a first and second mnamber and a damnping mnecllhaism arranged Intermediate said springs characterized by a post extending from the first member having a substantially vertical friction face thereon, walls on the second member receiving said post therebetween, a horizontally disposed plate connecting said walls having a central Inclined surface converging towards said friction face, a web having an incl ined surface thereon displaced from and parallel to the first inclined surface, another weob having an inclined surface thereon displaced from and parallel to the first Inclined surface, Inner edges of said webs spaced from each other providing an unobstructed area between said plate and said friction face, a wedge having a face lying along and engaging said friction face, a sloping central surface on said

wedge lying along and engaging said central inclined surface said wedge having a sloping surface at each side thereof each lying along and engaging one of the Inclined surfaces of said webs, a coil spring disposed in said area compressed between the wedge and the second member urging the sloping surfaces of the wedge Into engagement with said inclined surfaces and the face of the wedge into engagement with said friction face, and abutment means acting against the post preventing lateral shifting of the first member In response to the action of the wedge and is to be regardeq as excluded from the scope of our present claims.


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