GB897185A - Improvements in or relating to fuze spinning apparatus - Google Patents

Abstract

897,185. Testing clockwork fuzes. AVIATION, MINISTER OF. June 14, 1960 [June 17, 1959], No. 20764/59. Class 9(1). Apparatus for testing time fuzes, more particularly clockwork mechanisms 17, comprises one or more motor-driven rotor shafts 2, each with a head 6 to receive the mechanism undergoing test, and a safety cover 36. Closure of the cover 36 automatically starts the drive of the shaft and, at a predetermined speed, the fuze timing mechanism 68 is automatically started along with time-recording means, which indicates the interval between starting of the fuze mechanism and release of the fuze firing pin 70. When the pin 70 is freed, the timerecording means is locked and the head 6 brought to rest. The head 6 comprises a member 12 which receives the clockwork 17 and a closure 15 in which is a replica 18 of the handrace part of the fuze. The cap 23 at the top of the closure 15 houses a slidable plunger 24 from which depends a striker pin 33 aligned with a trigger 34 locking the hand 35 of the clockwork. A cabinet 5 housing the apparatus has a bed-plate 14 through which protrudes the closure 15 enclosed by the cover 36, Fig. 4, the cover being pivoted on the bedplate 14 and locked by a spring-catch 44 until released by means of a handle 45. Secured to the pivot is a contact 47 which, when the cover is closed, engages a contact 48 to operate an electric relay, which starts the motor driving the shafts 2. When the shaft 2 is rotating at a predetermined speed, a valve (not shown) opens to admit air to a cylinder 59 and so move a slider block 61. A lever 62 depending from the block then forces a plunger 51 downwardly, so depressing the plunger 24 and causing the pin 33 to release the hand 35. At the same time, the block 61 strikes a contact 67 and starts the timing mechanism 68. When the hand 35 has moved into alignment with a gap 69, the pin 70 is released and hits a contact pin 71, thus operating a relay which stops the timing mechanism. Simultaneously electrodynamic braking is applied to the shaft assembly and when the head 6 comes to rest the cover 36 may be released either manually, by means of device 44, or by electromagnetic means operating automatically. The forked end 76 of a lever (not shown) bears against a sleeve 75 connected to a plate 19 beneath the mechanism, so that by depressing the lever, the mechanism is raised and can be removed from the housing 15. Coloured lights 85, 86, 87 in a panel 83 flash-up to indicate each stage of the test-cycle and a panel 84 is provided with illuminated counter dials showing the time which elapses in the test. 897,280. Earth-excavating cutter tool mounts. CLEVELAND TRENCHER CO. Feb. 7, 1961 [Oct. 28, 1960], No. 4539/61. Class 68(1). The inter-engaging parts of a replaceable chisel-like cutting tool and a base member 21 by which the tool can be mounted on the excavating structure of an earth excavator are such that the tool can be selectively orientated about the axis of the tool into one of a number of positions. The parts preferably are a shank co-engaging in a socket 24, the shank and socket having complementary polygonal cross-sections.