Patent GB-622860-A (GB)
Title: Improvements in or relating to a chair or similar article of furniture
IPC: A47C1/024
Filed: 1947-04-08
Abstract: 622.860. Seats. WARREN McARTHUR CORPORATION. April 8, 1947, No. 9294. Convention date, April 23, 1946. [Class 52 (ii)] A chair comprises a support frame provided with a seat frame or back frame or both movable with respect thereto and a control mechanism, carried by the support and cooperating with the movable frame, which mechanism includes a rotatable device, for locking or permitting movement of the movable frame or frames in one or both directions. Fig. 1 shows a chair in which a seat frame 30 is adjustable longitudinally in respect to the support 20 and is pivoted to the lower end of the back frame 26 whereby the latter is also adjustable. In a modification the back frame may be fixed in which case the rear end of the seat frame slides in fixed guides, which in a further modification the seat frame may be fixed and the back 'frame provided with a pivoted horizontal part analogous to the seat for co-operation with the control mechanism on the support frame 20. The support frame 20 includes a front transverse member 25, Figs. 5 and 9, having secured to it at one or each side a bracket 43 for the control mechanism. As shown the bracket 43 carries a rotatable spindle 48 haying at one end a drum 39 having a loose split sleeve and at the other end a pinion 58 which meshes with a rack 42 carried by a bracket 35 fixed to the side member 32 of the movable frame which may be the seat frame. Below the spindle 48 is provided a fixed bolt 54 having rotatable thereon a grooved wheel 56 to serve as a guide to a depending flange 38 on the movable frame side bracket 35. Also mounted on the bracket 43 is the operating lever 61 which has a horizontal part 62 rotatable in'the bracket and carries a stud 66 bearing a rotatable grooved pully 68. A cable 71 is secured at one end to the bolt: 54, passes several times around the drum 59, around the grooved pulley 68 and is secured at its other end to a shackle 74 carried by an adjusting screw 75 guided in a guide 79 and operated by an elongated nut 76. The control mechanism is duplicated at the other side of the support frame except for the handle portion 63 of the operating lever 61. A spring 80, Fig. 9, is provided to keep the horizontal part 62 of the operating lever 61 in such a position that the grooved pulley 68 keeps the cable tautened to bind on the drum 59 and so lock the movable frame, rotary movement of the part 62 by the handle 63 moving the pulley 68 into a position allowing the cable, to slacken and permit movement of the movable frame. More than one. cable maybe wrapped around the drum to lock the movable frame in both directions of movement. The front member 34 of the movable frame is provided with a spring-pressed bolt 86 which forms an abutment limiting the rearward movement of the movable frame, the rack 42 and pinion being arranged to prevent separation of the movable frame froin the support frame. When however the bolt 86 is withdrawn the movable frame may be moved into a slightly more rearward position so that the pinion 58 no longer engages the rack 42 so permitting the movable frame 32 to be separated from the support frame.