Patent GB-442218-A (GB)
Title: Improvements in or relating to target indicators
IPC: F41J5/04
Filed: 1934-07-26
Abstract: 442,218. Electric signalling systems. GRIGORIU, C., 46, Tepes-Voda, Bucharest. July 26, 1934, No. 21919. Convention date, Feb. 9, 1934. [A Specification was laid open to inspection under Sect. 91 of the Acts, Jan. 28, 1935.] [Class 40 (i)] [See also Groups X and XIX] In a system for automatically recording the hits on a target of the type comprising two series of electric circuits representing co-ordinates of the point hit by the shot, each circuit including an electromagnet and the actuation of an electromagnet in each series causing corresponding deflections of a pivoted arm to produce co-ordinate movements of a marking pin, the pivoted arms are directly operated by the electromagnets. As shown in Fig. 4, two sets of electromagnets 45, 46 are adapted to be actuated by the recoil sections of the target, the armatures coacting with levers 31, 32 which move through variable arcs according to the recoil section struck and actuate through linkwork 36, 37 two slides 38, 39 so that a needle 16 carried by the slide 38 is given the combined movement and perforates a record sheet 17 carried on a frame 40. In the event of two adjacent plates of the target being actuated by a single bullet, two electromagnets in each system are actuated, so that collars 58 on their armatures actuate contact rods 60 which cause energizing of further electromagnets 54, 55 thus causing the record carrier 40 to be moved through a distance corresponding to one half the width of a recording section before the sheet is punctured. The slides are spring actuated for return. The marking pin is secured to the slide 38 by a helical spring and when moved by the electromagnets 45, 46 merely slides over the surface of the paper. As soon as the magnets are de-energized, however, the direction of the slides is reversed and the paper is punctured during the change of movement of the spring. The target, Figs. 2 and 3, comprises a round or square plate 1 secured in a frame, and square recoil sections 5 arranged in rows behind the plate ; each section is provided with four contact pins 8 which establish connection between adjacent members of horizontal and vertical circuits 9, 10, two horizontal and two vertical wires being provided for each row of sections. Each circuit is in electrical connection with an electromagnet, which is energized when a target section recoils and operates means to indicate on a recording sheet the position at which the bullet strikes the target. The Specification as open to inspection under Sect. 91 also describes a form of signalling device, Fig. 3b and 4 (Cancelled) wherein two series of electromagnets 14, 15 are disposed at right angles, one electromagnet for each pair of wires behind the target, and a perforating needle 16 for each electromagnet, so that two needles are actuated to perforate a record sheet, whence the position of the target section struck can be computed. The perforating needles are pivotally mounted on shafts 19, Fig. 4 (Cancelled), supported on levers 14a which are actuated by the electromagnets 14 and after each perforation the positions of the perforating needles is adjusted by means of a pawl-andratchet actuated by an electromagnet 21 in series with the electromagnets 14, a stop 23 preventing movement of the needle-carrying lever 22 during one movement of the electromagnet armature which is spring retracted. At the end of a session the needles can be restored to their original position by release of the stop which is actuated by the raising of the shutter 18 of the indicator when renewing the record sheet, the stop being spring retracted. Two alternative forms of perforating needle 16 are shown in Figs. 6a and 7a (Cancelled), the former showing a needle 16 carried by a helical spring on a carrier 38 and the latter a needle mounted at the end of a lever 48 pivoted to a carrier, a trip pawl 50 and rack 51 causing the puncturing movement of the needle. This Specification also described a system in which a selector mechanism is employed at the target position to transmit the result through a single pair of wires for each series of electromagnets. The selector, Fig. 8 (Cancelled), comprises two opposed sets of electromagnets 72, 73 the armatures of which are adapted to actuate the odd numbers of a series of contacts 65, 66 supported in frames 67, 68, and to push these contacts into the paths of toothed discs 63 mounted on a shaft 64, the number of teeth on each disc corresponding to the position of the wires behind the target. A further series of electromagnets 75 are connected in series with the electromagnets 72, 73 and these are adapted to release a detent 76 so that the disc shaft 64 can be rotated by a weight 81. The contacts 65, 66 are thus actuated by the respective teeth on the discs to transmit the corresponding numbers of impulses through contacts 71 to a line leading to the firing position, this line being connected to an indicator. The contacts 65, 66 are reset by means of an electromagnet 80 which is actuated at each rotation of the disc shaft by contacts on a disc 74 on the shaft. In the event of more than one target section recoiling then the cross-shaped even numbered contacts 69 are pushed bodily forward by the electromagnets 72 instead of being oscillated and the corresponding numbers of impulses are transmitted by the corresponding toothed discs on the shaft. An alternative form of indicator is shown in Fig. 10 (Cancelled) and comprises two slides 38, 39 adapted to move in direction at right angles under the influence of the transmitted impulses from the selector, these impulses actuating pawls and racks 84, 85 attached to the respective slides, through electromagnets, the slides are spring retracted. This subject-matter does not appear in the Specification as accepted.