GB478905A - Improvements in or relating to electric medical appliances - Google Patents

Abstract

478,905. Induction coils. SCHOLL MANUFACTURING CO., Ltd., and NORRIS, G. THORNTON-. Nov. 30, 1936, No. 32811. [Class 38 (ii)] [Also in Group VI] In a medical induction coil having a movable core connected to means, such as an electric, clockwork, or fluid motor, which reciprocate it in the coil to produce surges in the treatment current, the driving means is such as to produce instrokes and outstrokes of differing mean speeds. As shown, a pair of coils 16, mounted side by side on a sub-panel 14 connected to the main panel 1 of the apparatus, each contain a core 17 connected by a yoke 18 slidably mounted on a guide rod 19. An electric motor 22 mounted beneath panel 14 has a shaft 23, Fig. 3, carrying a pinion 24 meshing with a pinion. 25. A crank-pin 27 on pinion 25 engages a slot 28 in a lever 29 having a pin-and-slot connection 31 to a bracket 21 on yoke 18 whereby the cores 17 are reciprocated with a slow outstroke and quick return or vice versa according to the direction of rotation of the motor or reversing mechanism which may be included in gearing train. The motor speed may be controlled electrically or by brake mechanism operated by a spindle 39 carrying a slotted link 40 engaged by an arm 43 on a spindle 41, the spindle carrying a control knob 10, Fig. 2, above panel 1 and also carrying a segment 42 having a flat 47 and adapted: on moving from the position shown to close the motor switch 46. The motor is preferably energized from the mains through terminal sockets on the panel 1, and the coils from batteries carried in the casing housing the apparatus.