baber/WOPTO huggingface dataset:
Patent GB-1330356-A (GB)
Title: Photographic light-sensitive materials
IPC: G03C1/38
Filed: 1970-11-19
Abstract: 1330356 N<SP>1</SP>-Methylated perfluoro heptane carboxylic acid amino-propylamide FUJI PHOTO FILM CO Ltd 19 Nov 1970 [24 Nov 1969] 55099/70 Heading C2C [Also in Division G2] The compound of the formula is made by treating (perfluoroheptane) carboxylic acid ethyl ester with N : N-dimethyltrimethylene diamine in ether and reacting the product, N - (perfluoroheptanoyl) - N<SP>1</SP> : N<SP>1</SP>- dimethyl-trimethylene diamine, with methyl iodide. The first compound above is used in photography.
Patent GB-1451487-A (GB)
Title: Rotary fluid-pressure machine
IPC: F01C1/10
Filed: 1973-11-28
Abstract: 1451487 Rotary positive-displacement fluidmachines DANFOSS AS 28 Nov 1973 [2 Dec 1972] 55205/73 Heading F1F In a gerotor-type machine, which may be a pump or a motor, the teeth of a fixed ring 6 co-operating with a planetary toothed wheel 12 are constituted by rollers 15, which engage with recesses 28 in a member 13, the line of contact Y between each roller and the wheel being co-linear with the line of contact X between the roller and the said member. This arrangement is said to reduce wear. A shaft 16 coupling the wheel 12 to an input, or output, shaft 9 has a splined head 17 and strip-like portion 16 engaging with an opening 20 in the wheel. A bore 30 may be provided in the member 13 so as to accommodate an end 19 of the shaft portion 16.
Patent GB-1209617-A (GB)
Title: Improved method of, and means for, manufacturing gullies
Inventor: CHERRY GEORGE JOSEPH NALL
IPC: E02B11/00
Filed: 1967-12-05
Abstract: 1,209,617. Moulding gullies. G. J. N. CHERRY and J. D. CHERRY. 27 Nov., 1968 [5 Dec., 1967], No. 55209/67. Heading B5A. In a method of making a gully from a preformed open-ended barrel member the barrel member 1 is located on a stationary former 2, Fig. 1, and the ends are bent over either by the shaping elements 9, Fig. 2, carried by a rotating shaft 7 or by a rotating die member. The barrel members 1 may be carried by pellets which move on a conveyer to a station to receive the former movable upwardly by a ram. The end of the barrel may only be partially closed in which case closure is completed by a patch.
Patent GB-1403272-A (GB)
Title: Track for a vehicle having a linear electric motor
IPC: E01B25/10
Filed: 1972-11-30
Abstract: 1403272 Rail fastenings; rail joints CEGEDUR SOC DE TRANSFORMATION DE L'ALUMINIUM PECHINEY 30 Nov 1972 [1 Dec 1971] 55412/72 Heading E1G [Also in Division H2] In a linear motor secondary member (see Division H2) comprising elongate rails joined together end to end, each rail, e.g. 11, comprises a base portion 111, a cavitied vertical portion 112 and a tubular portion 113 fixed to the top of the vertical portion. Two rails 11, 12 are joined together by fish plates 221 and 222 and by a unit 21 comprising a central limb 210 of the same cross-section as the vertical portion of the rails, the limb 210 carrying resilient protuberances e.g. 2111, 2112, engaging some of the cavities in the rails. The fish plate 221 is mounted in the cavities 1123 and 1223, is fixed to the rail 12 by a stud 2211 and carries a further stud 2212 slidably engaged in a slot 11231 in the rail 11. The fish plate 222 is mounted in similar fashion in the tubular portions 113 and 123 of the rails 11 and 12. Fig. 8 illustrates how the base portion 111 of rail 11 may be secured to support 30 by bolts 3341 and rigid rail clips 332. 331 is a packing piece and 333 is a guard member to prevent the heel of the rail clip from biting into the support 30 on the packing piece 331. In a modification, Fig. 11, bolts 3361 associated with the rail clips engage a packing piece 3370 located in a recess in support 30. Packing piece 3370 is welded to C-shaped members 3371, 3372 embedded in the support.
Patent GB-1285278-A (GB)
Title: Vehicle for transporting containerized freight
Inventor: MISCHEK HUGO
IPC: B60P1/64
Filed: 1970-11-21
Abstract: 1285278 Vehicles for handling containers; load handling SILER AG 21 Nov 1970 55451/70 Headings B8H and B8Q A vehicle for the transport of a freight container 6 comprises a closed frame 1 formed with an opening for receiving the container and having transport wheels 11 at one end, a jacking arrangement 16 intermediate the ends of the frame 1 for pivoting the frame upwardly to facilitate entry of the container into the frame opening when the frame is moved towards the container, and means 19, 20 on the frame for lifting the container clear of the ground ready for transport once the frame 1 has been lowered. The jacking arrangement comprises an hydraulic ram 16 at each side of the frame 1, and each universally mounted at its top 17 to a structure 30 on the frame 1, and at its bottom 18 to one arm 9 of a U-shaped frame 7 pivoted at 27 to the frame 1. A wheel 10 at the end of each arm 9 engages the ground to support the frame 1 when elevated. The lifting means 19, 20 comprise hydraulic jacks having feet rotatable within recesses in the container for locking engagement therebetween. In the embodiment of Fig. 2 (not shown) the transport wheels are formed by wheels at the end of arms pivoted to the underside of the closed frame, the elevating jacks therefor being positioned at the elevatable end of the frame and pivoted to the wheel arms. Holes in the sides of the closed frame facilitate bolting the container to the frame when elevated, to relieve the load on the container jacks.
Patent GB-554589-A (GB)
Abstract: 554,589. Magnets. SANGAMO WESTON, Ltd. June 26, 1942, No. 8785. Convention date, Oct. 23, 1941. [Class 35)] [Also in Group XXXVI] In a moving coil D.C. instrument the permanent magnet field structure with a view to obtaining high flux density and small flux leakage comprises a pair of symmetrically arranged permanent magnets 6 curved towards each other and spanned by a segmental yoke 7 of high permeability material, the pole pieces 3 also of high permeability material being secured to the free ends of the permanent magnets 6. The parts 3, 6, 7 are secured to each other by bolts or by welding or brazing. The outer surface of the magnetic assembly may be cylindrical as shown. The inner surfaces 6i of the permanent magnets are also cylindrical with the same radius of curvature r as the outer surface 6‹. The inner length I of each permanent magnet is therefore equal to the outer length O and the cross sectional area is constant throughout its length.
Patent GB-1173760-A (GB)
Title: Improvements relating to the Welding of Terminals to Capacitors
IPC: H01G13/00
Filed: 1966-12-14
Abstract: 1,173,760. Welding by pressure. MIAL S.p.A. 14 Dec., 1966 [30 Dec., 1965], No. 55943/66. Heading B3R. In resistance welding a metal terminal to the metal foil of a capacitor the terminal is supported on an electrically insulating member, the foil is brought into contact with the terminal, a pair of spaced apart electrodes are brought into contact with the foil and current is passed between the electrodes. The copper, bronze or tinned brass blade terminal 3 is placed on an insulating support 5, the aluminium foil 4 of a paper capacitor is placed on the terminal and a pair of electrodes 1, 2 are engaged with the foil. Current passed between the electrodes welds the foil to the terminal. A prior art method is described in which the foil is placed on the support with the electrodes in contact with the terminal.
Patent GB-1114693-A (GB)
Title: Phenthiazine-10-carboxylic acid esters
Inventor: JUCKER ERNST
IPC: C07D471/10
Filed: 1965-06-29
Abstract: Compounds of the general formula <FORM:1114693/C2/1> and their acid addition salts wherein R1 is H or halogen, CF3, C1- 4 alkoxy, C1- 4 alkylthio, C1- 4-acyl or CN; R2 is C1- 4 alkyl or aralkyl; R3 =H or C1- 4 alkyl; and R4 is HaCH3 are prepared by reacting an acid chloride of the formula <FORM:1114693/C2/2> with a compound of the formula <FORM:1114693/C2/3>
Patent GB-1136172-A (GB)
Title: High speed hammer
Inventor: BITTEL KARL
IPC: B21J7/24
Filed: 1966-12-16
Abstract: 1,136,172. Power hammers. MAGDEBUR. GER ARMATURENWERKE "KARL MARX" " VEB. 16 Dec., 1966, No. 56478/66. Heading B3H. A high speed power hammer comprises a piston 3 guided in one end of a housing 1 containing a first chamber 2 supplied with pressure fluid through a non-return valve 11, and a second chamber 4 adapted to receive through a gasket 5 the larger diameter free end 3b of the piston, which end is separated by a collar 3a from the main part 3 thereof, the second chamber being connected with the first chamber through a conduit 7 and releasable non-return valve 8. The piston 3 is retracted by external means during which time a releasable non-return valve 9 allows escape of hydraulic fluid through pipe 10. A breather valve 13, biased open by a spring 14, prevents pressure build up in chamber 4. The chamber 2 is then pressurized by an hydraulic pump. To initiate the working stroke, valve 13 is closed and valve 8 is opened by mechanical, electrical or hydraulic means, thereby causing downward movement of the piston under differential pressure until the end 3b moves out of chamber 4 to provide a sudden acceleration of the piston. A recess 2a co-operates with the collar 3a to cushion the end of the stroke. In an alternative method of operation the valve 9 is held closed during retraction of the piston which thus pressurizes the chamber 2.
Patent GB-1410364-A (GB)
Title: Aerosol dispensers
IPC: B01J4/00
Filed: 1972-12-11
Abstract: 1410364 Spray producers CIBA-GEIGY AG 11 Dec 1972 [9 Dec 1971] 57050/72 Heading B2F An aerosol dispenser comprising a piston pump 15 for generating compressed air as a propellant, a product container 2 separate and remote from the pump, flow paths 10, 25 for product and compressed air, respectively, valves 11, 20 associated with the flow paths 10, 25, and an abutment 31 in the pump for opening the compressed - air valve 20 at or near the end of a compression stroke, the product valve 11 being caused to open in response to the opening of the compressed-air valve 20, and the product container 2, a spray nozzle 5 and product valve 11 constituting a single unit detachably secured to the piston 18. Upon opening the valve 20 compressed air flows through the Venturi nozzle 5 and aspirates product from the container 2 via a slotted membrane valve 11. Alternatively, the valve 20 may be provided with an extension rod (48) Figure 7 (not shown), which abuts against a product valve member (45) to mechanically open the product valve simultaneously with the compressed-air valve 20. The piston is detachably mounted in the cylinder by means of a bayonet joint (Figure 4 not shown). Various forms of product flow-controlling valves are described.
Patent GB-1460304-A (GB)
Title: Herbicidal composition for soybeans
IPC: A01P13/00
Filed: 1973-12-10
Abstract: 1460304 Herbicidal compositions ELI LILLY & CO 10 Dec 1973 [11 Dec 1972] 57231/73 Heading A5E [Also in Division C2] Herbicidal compositions comprise (a) an inert carrier, (b) 0.05 to 2.0 parts of a triazinone of formula: wherein Q represents phenyl, C 3 -C 8  cycloalkyl or C 1 -C 6  alkyl and (c) 0.25 to 4.0 parts of a 2, 6-dinitroaniline of formula: wherein R<SP>1</SP> is C 2 -C 6  alkyl optionally substituted with Cl, Br, F or methoxy, C 3 -C 6  alkenyl optionally substituted with C1, cyclopropylmethyl or cyclopropy ethyl; R<SP>2</SP> is hydrogen or as defined for R<SP>1</SP>, provided that when R<SP>2</SP> is hydrogen, R<SP>1</SP> is C 3 -C 6  sec-alkyl, or R<SP>1</SP> and R<SP>2</SP> together with the N atom to which they are attached form a C 3 -C 8  polymethyleneimino ring; R<SP>3</SP> is halogen, C 1 -C 3 , alkoxy, cyano, C 1 -C 4  alkyl, F 1 -F 3 , fluoromethyl, C 1 -C 2  alkoxy- C 1 -C 2  alkyl, optionally substituted with Cl, C 2 -C 4  alkenyl optionally substituted with Cl, C 1 -C 2  alkylsulphonyl or -SO 2 R<SP>4</SP>. Wherein R<SP>4</SP> is amino, azido, wherein R<SP>5</SP> and R<SP>6</SP> are C 1 -C 3 , alkyl or together are a tetramethylene chain; m is 0 to 2; n is 3 to 5; R<SP>7</SP> is C 1 -C 2  alkyl; X is H, CH 3 , C 1 -C 2  alkoxy, Cl or amino optionally substituted with C 1 -C 2  alkyl. A preferred composition comprises 0.25 to 2.0 parts of 3- methylthio-4-amino-6-t-butyl-1, 2, 4-triazin-5- one and 0.5 to 2.0 parts of 2, 6-dinitro-N, N- dipropyl-α, α, α-trifluoro-p-toluidine (trifluralin). A method of inhibiting the growth of weeds in soy bean cropland comprises applying the compositions to the soil and incorporating them in the top two to six inches thereof.
Patent GB-1159767-A (GB)
Title: Storage Cask for Use with Apparatus Laying Material of Rope-Like Form.
IPC: B21C47/14
Filed: 1967-12-18
Abstract: 1,159,767. Coiling rope. KABEL-UND METALLWERKE GUTEHOFFNUNGSHUTTE A.G. 18 Dec., 1967 [21 Dec., 1966], No. 57290/67. Heading D1T. An apparatus for coiling material of ropelike form into a storage cask having upwardly extending grid bars defining the vertical wall of the cask is characterized in that the storage cask is provided with an inner spiral single- or multi-thread slide path secured to said grid bars, the direction of rotation of which is which opposite to that of the spiral passed through by the material as it is laid in the storage cask. The slide path is formed by a metal or plastics band. The spiral is stated to prevent the material being coiled from passing outwards through the grid bars.
Patent GB-1192819-A (GB)
Title: Improvements in or relating to Mould Inserts
IPC: B22D7/10
Filed: 1967-12-19
Abstract: 1,192,819. Hot tops; treating castings. MANNESMANN A.G. 19 Dec., 1967 [20 Dec., 1966], No. 57489/67. Heading B3F. In order that an ingot may be stripped from its mould for air-cooling and yet retain top insulation, heat-insulating panels 2 are mounted in the mould to form a hot top at a selected height and each panel includes a steel plate 6 at its outer face with either the plates 6 extending below the panels 2 as shown or metal studs 7 extending from the plates, or both, so as to become welded to the ingot. The hot top thus remains on the ingot during stripping, aircooling, re-heating and, finally, rolling. Each panel 2 has secured to it a suspensory strip 3 with a line of apertures for hanging the panel on a rod 4 laid across the mould top, the selection of aperture depending on the ingot weight required. Corner pieces (5) hold the panels 2 in position. The mould is stripped, while the ingot still has a fluid core, and after cooling, the ingot, with hot top, is brought to rolling temperature in a soaking pit.
Patent GB-1207139-A (GB)
Title: Method of making transparencies and apparatus therefor
IPC: G03G15/20
Filed: 1967-12-19
Abstract: 1,207,139. Fixing toner images. RANK XEROX Ltd. Dec. 19, 1967 [Dec. 19, 1966], No. 57506/67. Heading G2H. A method of making transparencies includes fixing an image of light-absorbing thermoplastic particles to a substrate by irradiating the particles through substrate by a lower lamp 23 and reflector 22 so as to melt the particles and fix them to the substrate. An upper lamp 23 and reflector 22 may also be provided. The lamps 23 may be xenan lamps which have a pulse duration of from ¢ to 1 millisecond. A transparent endless band conveyer 42 conveys the substrate part the lamps 23.
Patent GB-1412980-A (GB)
Title: Reinforcement of polyamide moulding compositions
IPC: B29B9/14
Filed: 1972-12-14
Abstract: 1412980 Polyamide moulding composition DYNAMIT NOBEL AG 14 Dec 1972 [14 Dec 1971] 57787/72 Heading C3R A polyamide moulding composition comprises a homogeneous blend of a polyamide having a reduced specific viscosity (0À005 ml./g. in mcresol at 25‹ C.) of 116 to 150 produced from the dimethyl ester of terephthalic acid and 2,2,4- and/or 2,4,4-trimethylhexamethylene diamine and glass fibre and/or glass powder, e.g. chopped strands of 1 to 3 mm. average length or 5 to 50 Á powder. The glass may be sized and the composition may also include pigments, flame-proofers, e.g. pentabromodiphenyl ether and antimony trioxide, or mould-releasers, e.g. butyrolactone. The specified polyamide may be prepared by the process of Specification 1,328,523. Details are given of methods of incorporating glass fibres in the polyamide and properties of the composition are contrasted with those of compositions wherein the polymer is one of reduced specific viscosity 100 prepared from terephthalic acid. Reference has been directed by the Comptroller to Specifications 1,212,776 and 1,049,987.
Patent GB-1247810-A (GB)
Title: Fastening elements
IPC: F16B43/00
Filed: 1969-11-28
Abstract: 1,247,810. Fastening element. ILLINOIS TOOL WORKS Inc. 28 Nov., 1969 [29 Nov., 1968], No. 58329/69. Heading F2H. A fastening element comprises a nut 3 with a skirt 14 extending from a clamping face 4 and a washer rotatably carried on the skirt and retained by an outward lip 15 on the skirt, the washer consisting of radially inner and outer flat annular parts 10, 11 and a conical intermediate part 12, the bore of the washer having cylindrical portions 7, 6 with an annular inwardly extending bead 8 between, the diameter of the portion 7 adjacent the clamping face of the nut being less than that of the other cylindrical portion 6.
Patent GB-1373384-A (GB)
Title: Applicators or dispensers for adhesive tape
IPC: B65H35/00
Filed: 1971-12-16
Abstract: 1373384 Tape dispensers H ROTHENBERGER 16 Dec 1971 [17 Dec 1970] 58543/71 Heading A4G [Also in Division B8]  A portable adhesive tape dispenser has a leaf spring 14 which is deflected to the chain dotted position by the tension in the tape when it is applied to a surface by pressure roller and which serves to clamp the tape against an abutment 15  when the tape is not being applied. On completion of a tape application, the dispenser is pivoted anti-clockwise and the tape cut by an angled serrated blade 11 whereupon the spring 14 clamps the tape and causes its free end to withdraw onto the roller 9.
Patent GB-1206300-A (GB)
Title: Improvements relating to platen heat exchangers for steam generators
IPC: F22B37/14
Filed: 1967-12-27
Abstract: 1,206,300. Steam generators. SULZER BROS. Ltd. 27 Dec., 1967 [29 Dec., 1966], No. 58678/67. Heading F4A. The part 6b<SP>1</SP> of the outermost tube 6b of a superheater platen 3 exposed to the severest radiation is connected by at least one additional feed tube 6a<SP>1</SP> to the inlet header 4 and/or by at least one additional discharge tube 6a<SP>11</SP> to the outlet header 5. In Fig. 3 (not shown), the outer tube is provided with two additional feed tubes (6a<SP>1</SP>) and/or additional discharge tubes arranged between the outer tube (6b) and the next inner tube (6c).
Patent GB-1271709-A (GB)
Title: Dithiocarbamic acid esters and process for their manufacture
IPC: C07D235/06
Filed: 1969-12-02
Abstract: 1,271,709. Dithiocarbamic acid esters containing the benzimidazole nucleus. FARBWERKE HOECHST A.G. 2 Dec., 1969 [2 Dec., 1968], No. 58792/69. Heading C2C. Novel compounds I (including etherates thereof): where R<SP>1</SP> is H, Cl, Br, CF 3 , NO 2  or CN, R<SP>2</SP> is H, Cl, Br, CF 3  or NO 2 , R<SP>3</SP> is H or C 1-6  alkyl and R<SP>4</SP> and R<SP>5</SP> are H, Cl, Br, I, CF 3  or C 1-6  alkyl, are made by reacting a dithiocarbamic acid salt, R 4 R 5 .C 6 H 3 NHCS 2 M (M is a cation; prepared, e.g., by reacting an amine with CS 2  in the presence of ammonia to form the ammonium salts) with an appropriate 2-halomethylbenzimidazole. Pharmaceutical preparations exhibiting, in particular, anthelmintic properties, contain (I) as active ingredient; administration is, e.g., orally or subcutaneously.
Patent GB-596138-A (GB)
Abstract: 596,138. Tobacco pipes. HARRIS, W., and HARRIS. E. Aug. 3, 1945, No. 19992. [Class 130] A tobacco pipe comprises a body 1 having a screwed-on rim 4 both of thermo-setting plastic material, a bowl 5 of non-ligneous material, e.g. clay, fixed to the rim 4 and a filter 2 of ceramic material. Passages 6, 8 are provided for the smoke. Specification 596,101 is referred to.
Patent GB-1217269-A (GB)
Title: Improvements in and relating to spark ion sources for mass spectrometers
Inventor: VIERECKL FRANZ
IPC: H01J49/18
Filed: 1968-12-16
Abstract: 1,217,269. Supply systems for ion sources. DEUTSCHE AKADEMIE DER WISSENSOHAFTEN ZU BERLIN. 16 Dec., 1968, No. 59760/68. Heading H2H. A spark ion source 6 for a mass spectrometer is supplied by a circuit which includes a thyristor 3 and a pulse transformer 4. Initially, a trigger pulse is applied to the gate terminal 1 of the thyristor, allowing current to flow from a D.C. source to build up a field in the transformer primary. The thyristor is now cut off, and the field collapses, giving rise to a high induced voltage in the secondary winding which has a large number of turns and a high resistance. The induced voltage initiates a discharge across electrodes 5, and this discharge is sustained at a low voltage, the main part of the voltage drop being across the secondary winding. A further D.C. source applies an accelerating potential between the electrodes 5 and the wall of the ion source 6.
Patent GB-1200008-A (GB)
Title: Packaging of polyamides
IPC: B65B31/00
Filed: 1968-12-23
Abstract: 1,200,008. Packaging polyamides. E. I. DU PONT DE NEMOURS & CO. 23 Dec., 1968 [29 Dec., 1967], No. 60933/68. Heading B8C. A sealed package contains polyamide pellets in which the voids surrounding the pellets are filled with an inert gas, i.e. a gas which contains less than 5% of oxygen by volume and which does not react with polyamide. Preferably the gas contains less than 1% of oxygen by volume. Such gases as nitrogen, the gaseous products of the burning of natural gas, helium, neon, argon, krypton, xenon, radon and carbon dioxide may be used. This type of packaging effectively counters the discoloration of polyamides. Examples are given of discolorations of polyamide in inert gas and air. The invention also relates to a process for packaging polyamide pellets.
Patent GB-1276710-A (GB)
Title: Low molecular weight isocyanates which contain epoxide groups and a process for their production
Inventor: QUIRINO BERND
IPC: C07D303/24
Filed: 1969-12-31
Abstract: 1276710 Epoxyisocyanato siloxanes FARBENFABRIKEN BAYER AG 31 Dec 1969 [10 Jan 1969] 63421/69 Heading C3S [Also in Division C2] Epoxide-containing isocyanates of the general formula (in which R 1 , R 2  and R 3  each represent hydrogen atoms or substituted or unsubstituted C 1-18  alkyl, C 4-14  cycloalkyl or C 7-24  aralkyl radicals which may be interrupted by -O-; or R 1  and R 3  and the linking C atoms may form a hydrocarbon ring; R 4  denotes a divalent radical of molecular weight up to 1200 and consisting of C 1-18  alkylene, C 4-14  cycloalkylene, or C 7-40  aralkylene radicals which may be interrupted by -O-, -S-, and/or silicon, or may be linked together and/or may contain -O-, -S-, or silicon in the ring; R 5  represents C 1-12  alkylene, C 4-14  cycloalkylene which may be interrupted by a C 1-4  alkylene group or a hetero atom, a C 7-20  aralkylene radical or a C 6-14  arylene radical) are prepared by reacting an epoxy alcohol of the general formula with a di-isocyanate OCN. R 5  - NCO, at least one mol of di-isocyanate being used/mol of hydroxyl groups in the epoxy alcohol, and freeing the resultant compound of general formula (in which R 6 , R 7  and R 8  are the same as R1, R 2  and R 3  except that any hydroxyl group in the latter radicals is replaced by the grouping D) from unreacted di-isocyanate by throughflow or thin layer distillation at 80-200‹ C. Among specified alcohols, tetramethyl dimethylol disiloxane is mentioned, and specified products include
Patent GB-2000561-A (GB)
Title: Springs for brake shoes
IPC: F16D65/09
Filed: 1978-06-22
Abstract: A spring assembly for preventing a brake shoe from floating or departing off a backing plate, which shoe is pivoted to the backing plate. This spring assembly includes a shoe-hold-down plate spring of 'U' shaped cross section, and a shoe-hold-down pin extending through the opposed portions 48 of the 'U' so as to hold the aforenoted plate spring in position. Furthermore, stoppers 52 are provided on at least one of the opposed portions of the plate spring in the direction to face the other of the opposed portions, for preventing the plate spring from being deformed beyond its yielding point upon the assembling of the spring assembly. <IMAGE>