Patent GB-322290-A (GB)
Title: Improvements in electric blasting fuzes
IPC: F42B3/18
Filed: 1928-10-17
Abstract: 322,290. Nottingham Co-operative. Society, Ltd., and Plumb, A. J. Sept. 27,1928. Trusses comprise one or more pads and one or more retaining straps, a member slidable on one or more of the pads and connected to one end of the strap or straps, the other end being connected to the pad, and a spring tending to draw the ends of the straps together. A small, hinged plate for applying an upward pressure in the crutch may be attached to a pad. An appliance, Figs. 1 and 3, for a single rupture comprises an adjustable body belt 1 and pad 2; the pad being preferably formed with a concave inner face but of any usual construction, such as a core 2b of sponge rubber surrounded by two layers of felt 2a and a velvet cover 3, and fixed by adhesive or other means to a metal plate 4 which is also preferably covered with velvet 3<a>. A screw 5 passing through the plate 4 has a headed sleeve 5a which forms the pivot for the metal plate- 6, covered on one face with velvet 3b and on the other with leather 6a, and a plate 7 to the extremities of which one end of the belt 1 is attached by studs 8 or other means. One end of a spring 9 is connected to the sleeve 5a and the other end to a bolt 10 on the other extremity of the belt 1. A rivet 12, anchored to the plate 6, passes through V-shaped slots 11 in the end of the belt and the metal strengthening plate 13 respectively, and can also slide in the slot 15 in a plate 14 mounted on the exterior of the belt and positioned by the screw 10, this end of the belt being covered by leather 16 or other material. The arrangement of bolts and spring allows longitudinal and pivotal movement of one end of the belt and pivotal movement of the other. A crutch strap 17 may be provided. The plate 4 may be formed with a hinged, downwardly projecting, metal tongue, fastened to the strap 17 so as to give an upward pressure in the crutch. In the application of the invention to trusses for double rupture, the spring and resilient connecting means may be located between the two pads, or an adjustable strap or hinge between the pads is connected to them by spring means. In a modified method of mounting the springs, the screw 5 is provided with a sleeve and a screwed head, and through this latter passes a bolt at right angles to the length of the screw 5. The spring is assembled upon the bolt and enclosed within a sleeve connected to the belt or associated part serving to compress the spring. A construction suitable for use a kidney support, Fig. 8, comprises a plate. 31 attached to one extremity of the body belt by the pivotal member 7 and studs 8, and connected by springs 9 to an intermediate plate 32 which, in its turn, is connected by adjustable straps 33 to another plate 30 affixed to the other extremity of the belt. One end of each spring 9 is anchored to members 34 on the plate 31, the members 34 sliding in slots 35 in the metal plates 36; these latter plates and the other end of each spring being connected to the plate 32. The pad 2 is anchored at one end to the outer end of plate 31 and, at the other, it is attached by means such as a rubber band to the end of plate 30 to which the belt is attached. In the Provisional Specification, it is stated that the straps are of inextensible material such as webbing and the body belt has extensions of leather, the shorter of the extensions being connected by a buckle and attached to the plate 7. In the case of the double-rupture truss, either or both end straps may be buckled to the belt webbing, and each may be formed in two parts and connected together by a coiled spring in a sleeve or socket. The extension of the spring is limited by a slotted plate extending from the end of one strap and accommodating a pin on the other.