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* GB784798 (A)

Description: GB784798 (A) ? 1957-10-16

Improvements in or relating to guide assemblies for lift cars orcounterweights

Description of GB784798 (A)

PATENT SPECIFICATION Inventor:-JOHN HARCOURT BILLINGTON. Date of filing Complete Specification: March 16, 1956. Application Date: March 17, 1955 No 7834/55. Complete Specification Published: Oct 16, 1957. Index at Acceptance:-Class 78 ( 3), L. International Classification:-B 66 b. COMPLETE SPECIFICATION. Improvements in or relating to Guide Assemblies for Lift Cars or Counterweights. We, THE EXPRESS LIFT COMPANY LIMITED, of Greycoat Street, Westminster, London, S.W 1, a British 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 guide assemblies for lift cars or counterweights. Guide assemblies for lift cars or counterweights are provided for co-operating with guide rails to guide a lift car or counterweight as it ascends and descends a lift shaft In conventional lift installations it is usual to have two guide rails disposed down the length of the lift shaft and fixed in opposite side walls of the shaft With this arrangement a lift car has two guide assemblies co-operating with each of the guide rails, one of the two assemblies being mounted on the roof of the lift car and the other on the bottom of the lift car. It is desirable that guide assemblies should run along the guide rails with the minimum transmission of noise and vibration to the lift car and one object of the present invention is the provision of a guide assembly which substantially meets these requirements. According to the present invention, in a guide assembly adapted to be secured to a lift car or counterweight and arranged to co-operate with a vertical guide rail, at least one guide shoe or roller is mounted in the frame of the assembly through a rubber or rubber-like body, in such manner that the guide shoe or roller is capable of displacement in a vertical plane perpendicular to the engaged surface of the guide rail relatively to the lift car or counterweight against lPrice 4-6 dl force developed by said body due to said displacement and acting on one side of a horizontal plane perpendicular to the guide rail and either substantially bisecting the guiding surface 6 f the guide shoe or passing through the point of contact of the guide roller with the guide rail, the said force being assisted af least for one sense of displacement by force acting on the other side of said plane and developed in a spring mounted between said frame and said shoe or roller and isolated from said frame by rubber or rubber-like material. The force developed by the rubber or rubber-like body is preferably a torsional force. The or each guide shoe or roller of the assembly may be mounted on an arm. secured at one end to the assembly through a rubber or rubber-like body so that the arm is rotatable about the secured end against the action of torsional force developed by the said rubber or rubber-like body Preferably, the arm is provided at the secured end with a shaft perpendicular to the arm, the said shaft being bonded into a rubber bush which is bonded to the frame at its outer surface. The end of the arm which is not associated with the rubber or rubber-like body may be arranged between two stops on a shaft fixed at one end into a block member which is secured to the frame through a rubber or rubber-like material One of the stops may be movable in one direction along the shaft against spring action so that abutment of the arm against this stop due to displacement of the guide shoe or roller causes the spring to provide a force which assists the force developed by the rubber or rubber-like 784,798 784,798 body at the secured end of the arm One of the stops may be fixed to the shaft so that abutment of the arm against this stop causes the rubber or rubber-like material through which the block member is mounted to the frame to provide a force to assist the force developed by the rubber or rubberlike body at the end of the arm. A guide shoe of the assembly may be a carbon shoe adapted to slide along the surface of the guide rail In guide assemblies where three guide shoes or rollers are provided, two being arranged in alignment and the third being perpendicular to the other two, they may be three guide rollers or three carbon shoes Alternatively the two aligned ones may be rollers and the third a carbon shoe or the two aligned ones may be carbon shoes and the third a roller. Two guide assemblies in accordance with the present invention and for a lift car will now be described by way of example with reference to the four Figures of the drawings accompanying the Provisional Specification. In the drawings:Figure 1 shows a part sectional side elevation of one guide assembly; Figure 2 shows a part sectional top plan view of the same assembly; Figure 3 shows a sectional view on the line Ill-III of Figure 1; and Figure 4 is a part sectional side elevation of another guide assembly. Referring now to Figures 1 to 3 of the drawings, the guide assembly comprises three identical guide rollers 1 mounted in a frame member 2 which is fixed to the lift car (not shown) by fixing nuts 3 (Figure 2) screwed on to bolts 4 attached to the lift car The guide rollers 1 co-operate with a vertically disposed guide rail 5 which is fixed centrally in one of the side walls of the lift shaft In order to provide good frictional grip between the rollers 1 and the guide rail 5 and to aid 4.5 silent running, the rollers are each provided with a rubber tyre 6 of known rubber composition. Two of the guide rollers 1 are arranged in alignment parallel to a side of the lift car c 0 and co-operate with side surfaces 7 and 8 of the guide rail 5 The remaining guide roller is mounted perpendicular to and slightly above the other two guide rollers and cooperates with the edge 9 of the guide rail 5. a Each roller 1 is mounted on ball bearings (Figure 2) carried by a horizontal shaft 11 which is fixed between a pair of parallel members forming an arm 12 The parallel members of each arm 12 are joined at their 0 lower end by a shaft 13 which is fixed to the frame member 2 through a rubber bush 14 The rubber bush 14 has metal sleeves and 16 bonded to its inner and outer surfaces respectively The sleeve 15 is a force fit on the shaft 13 and the sleeve 16 is a force fit in the frame member 2 so that rotation of the arm 12 in a vertical plane about the axis of the shaft 13 is permitted by the resilience of the rubber bush 14 70 The upper ends of each pair of parallel members forming an arm 12 are joined by a cross-member 17 which has a cylindrical hole 32 therethrough A horizontal shaft 18, screwed at one end and provided with a 75 knurled bead 19 at the other passes through the hole 32 in the cross-member 17, the cross-member 17 resting on a sleeve 20 which is keyed to the shaft 18 by a pin 21. The shaft 18 is screwed into a block mem 80 ber 22 which is fixed to the frame member 2 through rubber bushes 23 and 24 Stops and 26 are provided on the shaft 18 for limiting free movement of the cross-member 17 along the sleeve 20 the stop 25 being 85 formed as a flange on the sleeve 20 and the stop 26 being of disc form The stop 26 is held against the sleeve 20 by a compression spring 27 fitted on the shaft 18 between the knurled head 19 and the stop 26 90) The block member 22 has two projections 28 and 29, in which are screwed the shafts 18 associated with each of the aligned guide rollers 1 The rubber bushes 23 and 24, similar to the bushes 14, fix the block 95 member 22 to bolts 30 screwed into the frame member 2 The block member 22 is so fixed to the frame member 2 through the rubber bushes 23 and 24 that when the assembly is in co-operation with the guide D 00 rail 5, the axes of the rubber bushes 23 and 24 are at equal distances from the vertical cen-r Lal plane of the guide rail 5, and the Projections 28 and 29 extend below the block member 22 and the shafts 18 associ 105 ated with the aligned guide rollers are screwed into the projections 28 and 29 at their lower extension The shaft 18 associated -with the third guide roller 1 is screwed into the block member 22 centrally of the 110 two bushes 23 and 24 and on the opposite side of the block member 22 to the projections 28 and 29. In construction of the guide assembly the guide rollers 1 are mounted in the assembly 115 so that, when the assembly is fitted to the lift car, they will co-operate with the surfaces of the guide rail 5 either without biasing forces being provided by the rubber bushes 14 or with very slight biasing forces 120 in the direction of the guide rail 5 The spring 27 is pre-loaded by positioning the sleeve 20 on the shaft to give the desired compressing on the spring 27 Adjustment of each of the guide shoe assemblies when 125 it is in co-operation with the guide rail 5, is made by turning the knurled head 19 of the associated shaft 18 after having loosened lock nut 31 The effect of turning the knurled head 19 is to screw the shaft 18 into 13 ') 784,798 the block member 22 and thus alter the position of the stops 25 and 26 The small clearance