Improvements in coin-actuated medical batteries / [Nelson Marshall Watson].

  • Watson, Nelson Marshall.
Date:
1902
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in coin-actuated medical batteries / [Nelson Marshall Watson]. Source: Wellcome Collection.

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    Watson's Improvements in Coin-actuated Medical Batteries. Mounted upon the shaft and attached at one end thereto is a coiled spring, whose opposite end is attached to the base and whose tension is exerted to return the shaft and handle to their normal position after an operation. When the handle is released by the operator, said spring returns it and at the same time the arm mounted upon the shaft and adapted to move in frictional contact therewith, engages the end of 5 the bellcrank lever, extending into the path of said arm and actuates said lever to carry the opposite end thereof from contact with the spring terminal and break the electric circuit, the shute being restored to its normal position by the spring adjacent thereto. To provide an intermittent current, when the handles are placed in circuit with 1() the battery, a conductor is employed, which is connected with the coil of the electro¬ magnet and leads to a'binding screw connected with a contact arm, carrying an adjustable contact screw, whose point stands adjacent to a vibrator, in circuit with the metal base and in the field of said electro-magnet, so that upon the closing of the main circuit, or contact terminal, the circuit is also closed through said vibrator, 15 thereby putting said vibrator in operation. To provide for regulating the current which flows through the handles of the machine and to the operator grasping said handles, the core of the electro-magnet is covered by a movable sleeve, which embraces said core and which is connected by means of a pin with a bracket mounted upon a vertically movable rod, which is 20 provided at its lower end with a rack which meshes with a pinion on the shaft, whereby when said shaft is rotated through the handle the rod is raised carrying upward the sleeve embracing the core of the magnet and effecting a proportional increase in the flow of current. In order to register the amount of current being used, there is mounted in a bracket and movable therewith, a rack bar, whose upper 25 end engages a pinion mounted on the shaft of a movable hand, adapted to sweep the graduated face of a dial, whereby as said rack bar is carried upward with the opera¬ tion of withdrawing the sleeve from the core of the magnet, it causes the indicating hand to register the amount of current on said graduated scale. When the crank, or handle, has been caused to make nearly a complete revolution considerable tension is placed upon a spring, which upon the release of the handle will return said handle with a force liable to cause injury to the parts. To obviate a foiced letuin of the handle upon its lelease, the lower end of a vertically movable rod is provided with a piston, which is adapted to reciprocate in a closed air cvlinder and which is drawn upward as said rod is raised to actuate the sleeve of the core and the hand of the dial, so that said piston upon the release of the handle after an operation of the machine is at the top of the cylinder whereby an air cushion is formed in said cylinder below the piston which prevents a sudden return of the handle, but allows said parts to gradually resume their former or normal position. In the face of the case is a coin opening, which directs the coin to the shute. In the operation of this device, a coin is placed in said opening and is conveyed by the shute to the curved beveled face of the bell crank lever, when the operator grasps the handles and moves one of them so as to cause the pivoted shute to force the com against the beveled face of the bellcrank lever and carry the point of said ever into contact with the terminal, thereby placing the handles in circuit with'the 45 battery and the vibrator through the electro-magnet. The initial current is com- ' paratiyely weak, owing to the fact that the sleeve covers the core of the magnet After the handles have been placed m circuit however, any desired increase in the flow of current may be effected by rotating the movable handle so as to withdraw the sleeve from the core of the magnet, as before described. When the coin is forced IL i m u v of,theJbellcrank leverit l^ses from the shute, so that when mthW f ueen released anad thfi Parts restored to the normal position, the machine cannot be again operated until another coin is inserted. 30 35 40 50 Dated this 14th day of June, 1901. WHEATLEY & MACKENZIE 40 Chancery Lane, London, W.C, Agents 55