Patent GB-663480-A (GB)
Title: Adjustable locking device
IPC: F16B1/04
Filed: 1949-05-25
Abstract: 663,480. Locking levers & rods. TRIGGS, W. W. (Deal Slide-Lock Devices, Inc.). May 25, 1949, No. 13948/49. Class 80 (iii) An adjustable lock for levers and the like comprises a guideway 8, Fig. 1, in which resides a flexible member 26 connected therewith at spaced positions, a number of wedge-like holding members 10, 11, 12, in the guideway and engageable with opposite surfaces of the flexible member 26, and means connected with the holding members for adjustment thereof along the guideway, the holding members providing a plurality of pairs of wedging surfaces. In the embodiment shown in Fig. 1, a flexible strip 26 is secured at its ends to the channelsectioned guideway 8 and passes between inclined surfaces 10a, 12a, and 11b, 12b, of holding members 10, 11, 12. The outer members 10, 11 are normally pressed towards the inner one 12 to cause lateral spreading and therefore locking, of the members, by springs 18, housed in recesses in member 12, the inner ends being engaged by downwardly projecting portions 22 on connecting members 21. The opposite ends of members 21 are secured by pins 23 to the members 10, 11. The part to be controlled is connected to an extension 4, Fig. 2, of a plate 28, the latter being screwed at 29 to the central member 12. To move the controlled part to a new position, a U-shaped plate 34 is slid longitudinally by an extension 5 actuated by lever, or other means, so that one of the inner edges of a pair of elongated slots 35, 36, engages a pin 31 or 32, connected to the members 10, 11. This releases an outer wedge from the central one and the others follow the first wedge because of the connecting members 21. In the embodiment shown in Fig. 8, a tubular guideway of rectangular cross-section is employed, the strip 43 being secured thereto by inturned ends 69, 70. The controlled member is connected by members 50, 45, and pin 46 to the central wedge 40, which is locked by wedges 41, 42, which are pressed towards it by springs 58, 59, housed in apertures 61, 62, of the wedges and abutting upstanding ends 64, 65, of the unlocking member 52. On moving member 52 in either direction a pin 53 or 54 thereon coacts with an edge of elongated slots 56, 57 in the wedges to move them in the appropriate direction. In a modification, Fig. 14 (not shown) the outer wedges are connected directly by springs to the inner one. In an embodiment for locking a throttle lever 88, Fig. 11, or the like, the lever is pivoted at 89 to a casing 86 with its upper end offset to lie in a recess 96 of a control lever 94 and apertured to receive a pin 91 on the central wedge. The lever 94, also pivoted at 89, has curved surfaces 98, 99, to co-operate with projections 101, 102, on the outer wedge members to move them when the lever is rotated. The outer wedges may be pressed towards the central one by springs and connecting members similar to those in Figs. 1 and 2, or a cover member, slotted to pass the flanges of a channel guide member may have downturned ends acting on springs arranged as in Fig. 8. In a modification, Fig. 15, in which the wedges 116, 117, 118 move in a curved guide 114, springs 125 are anchored by pins 123, 124 to the wedges 116, 117, and also to projections 127 of an extension arm 128 pivoted by a bolt 130 to the plate 126. The arm 128 is connected by a lever portion 131 or otherwise to the controlled member, is screwed at 129 to the central wedge 118 and its upper end 132 lies in an opening of a control arm 134. On moving arm 134 about its pivot 130, the edges of elongated apertures 140 in extending portions 137, 138, thereof coact with pins 123, 124, fixed to the outer wedges to release the lock. In any of the embodiments, the wedges may be solid or formed from laminations secured together. Specifications 452,626 and 569,723, [Group XXV], are referred to.