Patent GB-459077-A (GB)
Title: Improvements relating to apparatus for use in shooting practice
IPC: F41G3/26
Filed: 1935-06-27
Abstract: 459,077. Shooting-practise apparatus. COOKE, G. H., 28, Dalmeny Avenue, Tufnell Park, London. June 27, 1935, No. 18463. [Class 119] [See also Groups XXXV, XXXVII, and XXXVIII] An apparatus for producing a momentary electrical impulse to produce a flash of light from an electric lamp or operate a bell or electromagnetic indicator comprises a resistance 2, Fig. 1, in parallel with the lamp or other signalling or indicating device 1, and in series with these a hold-on switch 4, across the electro - magnet 3 of which a short-circuiting switch 5 is provided. An additional signalling circuit 8 may be connected across this apparatus. A switch 6 is also provided across the contacts 4 of the hold-on switch to close the circuit of the electromagnet and resistance across terminals 7 of a source of given voltage to close the hold-on switch, after which the switch 6 is opened to leave the apparatus in readiness to operate as follows : The drop of potential in the electromagnet 3 leaves insufficient potential to operate the lamp 1. When, however, the switch 5 is closed and short-circuits the electromagnet 3, the full voltage is applied to the lamp 1, which then flashes during the short time the hold-on switch takes to break the circuit at the contacts 4 due to the short-circuiting of the electromagnet. This apparatus may be used for photographic exposures, for example, in connection with cameras used on aircraft and arranged to record the time when exposures are made by simultaneously photographing the dial of a clock illuminated by the flash. The apparatus may also be used in connection with shooting-practise apparatus, by causing the trigger of a dummy rifle to operate the switch 5. In the apparatus shown in Fig. 4, several lamps 1 are provided, one of which is put in circuit according to the position of a selector switch 9 operated by a rifle 11, for example, as described in Specification 459,075, so that when the trigger is pulled and closes the switch 5, the particular lamp 1 that lights up indicates the direction of the rifle. A contact device 10 may be inserted in series with the switch 5 and connected to the rifle so as to become closed only when the rifle is not correctly pointed. A lamp 12 may be connected across the contact device 10 to light up when the switch 5 is closed if the contact device 10 is open. The coil of a hold-on switch 14 may also be connected across the the contact device 10 to close the additional circuit 8 containing a lamp 13 when the switch 5 is closed and the contact device 10 is open. A third hold-on switch 16 may be added to maintain the circuit of the lamp 13 closed after the switch 5 is opened. A switch 15 is then provided to break this circuit, and this switch is operated by hand, or may be connected to the means for adjusting the sensitivity of the shooting- practise apparatus described in Specification 459,075 aforesaid, so as to be opened whenever an adjustment is made. The dummy rifle 11 mav be mounted in the manner described in Specification 459,076 on a casing 17, Fig. 5, supporting a target representation 18 surrounded by the ring of lamps 1, above which are two lamps 13 in series and the device 19 for adjusting the sensitivity of the apparatus. The switch 5 referred to above may be constructed as part of the trigger device of the rifle as shown in Fig. 6, wherein the toe 22 of the trigger 20 pivoted at 21 co-operates with a leaf spring 23 on the dummy hammer 24 to cock and release the hammer when the trigger is pulled, a spring 25 being provided to operate the hammer. The completion of the pull of the trigger causes a finger 26 on the trigger to press a spring blade 27 into contact with a metal strip 28, the parts 27, 28 acting as the contacts of the switch 5 aforesaid.