GB280014A - Improvements in counting apparatus - Google Patents

Abstract

280,014. Cooch, H. Oct. 12, 1926. Counters actuated by electric and magnetic means. - The movements to be counted cause alternate excitation of two electromagnets the common armature of which controls an escapement mechanism, the arrangement being such that the escape wheel receives impulses from the ratchet pawls to supplement the action of its spring. The escapement mechanism consists of a ratchet wheel 6 geared with the index hand 7 and engaged by linked pawls 5 one of which is pin-and-slot connected to an armature 3 pivoted at 4. The electromagnets 1, 2 are in circuit with contacts 24, 25 alternately engaged by a switch arm 17 reciprocated by the moving part. The index hand tends to turn clockwise under the action of a spiral spring 13, and when the armature oscillates the pawls act to release, impel, and hold the ratchet wheel. The apparatus may be applied to machine guns for counting the rounds remaining in the magazine, the switch arm 17 being actuated by the recoil. The construction permits of the hand being set back to any desired number and this may be effected by an external handle adapted to be put in gear with one of the wheels of the reducing train, 10, 11.