Patent GB-467459-A (GB)
Title: Improvements in artificial limbs
IPC: A61F2/60
Filed: 1936-08-25
Abstract: 467,459. Artificial legs. BARGHAUSEN, L. H. Aug. 25, 1936, No. 23344. Convention date, Aug. 26, 1935. [Class 81 (ii)] In an artificial leg, the knee includes a pivot bolt, a knee plate disposed in a plane including the bolt axis and formed with bearings for the bolt, an opening for accommodating a control device being disposed in the plate, a shallow cylindrical collar upstanding from the plate and flange equipment in the plane of the plate external to the collar forming an end abutment for the thigh section. In Figs. 1 and 2, the cylindrical collar 53 formed on the knee plate 52 is provided with slightlyyieldable extensions 55 over which the thigh section 47 is placed, abutting against a flange 78 and being secured by screws 83. The knee plate is also formed with lateral and posterior flanges The knee plate includes a pair of half-cylindrical recesses 56 which with members 60 form a bearing for the bolt. Lugs 59 on the members 60 engage sockets 58 on the plate at the front, and at the back the members are connected to the plate by adjustment screws 63. The bearing is lined with raw hide, and the frictional engagement with the bolt is adjusted by the screws 63, the heads of which are cross slotted for engagement of spring locking fingers 64. The bolt 49 passes through side arms 50 riveted to the shank portion 48. The central part of the plate is cut out to accommodate the hub portion 68 of the knee check 73 which surrounds the knee bolt. The check lug portion 69 includes a bracket carrying a roller 71 under which the control strap 7 passes. The body portion of the knee check is secured to the shank by screw 74. The check lug 69 engages a check bumper 75 preferably composed of a rubber block covered with raw hide and mounted in an undercut recessed seat formed in the flange 78. The ends of the leather may be tacked to the thigh. The thigh section may be shortened or tilted by applying the end thereof to a sand wheel 82 (Fig. 10). A knee cap 85 comprising two half shells secured together at 92 and forming a slot for movement therein of the knee check 73 is screwed. to the knee plate, and surrounds the knee plate flanges to form a neat joint with the thigh section. The knee plate and cap may be formed of Dow metal, or the knee cap may be formed of synthetic resin, celluloid, wood, hard rubber, &c. The supporting and controlling equipment (Fig. 15) comprises an adjustable hip belt 99 which includes a light metal shaped hip plate 101 hinged at 104. Fig. 14 shows a cross section of the belt in the region of the hip plate, the belt comprising two non- elastic bands 105, 106 sewn together and riveted to the hip plate, and a pad 108 and a cover 109. The hinge pin of the hip plate is tapered, and works in a tapered bushing, so that wear can be taken up. The thigh section is pivoted at 115 to an arm 113 secured to the hip plate. The ends of the knee check control strap are formed as elastic straps 117, 118, the latter being connected to the belt by adjustable lacing 119. An adjusting buckle 122 is also provided on the strap. The Specification as open to inspection under Sect. 91 comprises also a knee joint, Fig. 1 (Cancelled), similar to that of Fig. 1 except in the following respects:-a single flange 13 replaces the yieldable extensions 55; the lower halves 17 of the bearings are cast integrally with the knee plate at the back, and are adjusted by screws 20 working in tapped bores in the knee plate ; the knee check is formed with a forwardly extending bracket 28 screwed to the front wall of the shank; the knee cap 35 is formed in one piece, and does not surround the knee plate flanges, but is formed with a bevelled edge 37 engaging a corresponding groove in the knee plate. The knee cap is secured to the plate by long screws 38. In Fig. 5 (Cancelled), a metal thigh section 45 is welded to the upstanding collar 44 of the knee plate. This subject-matter does not appear in the Specification as accepted.