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Publication numberUS355858 A
Publication typeGrant
Publication dateJan 11, 1887
Filing dateSep 3, 1880
Publication numberUS 355858 A, US 355858A, US-A-355858, US355858 A, US355858A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
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US 355858 A
Abstract  available in
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Description  (OCR text may contain errors)

I I (No Model.)

F. R. BRAINARD.

ELECTRIC PUSH BUTTON. 7 No. 355,858. Patented'Jan. 11, 1887.

- WITNESSES: I [MENTOR QQ f41'- Y By &flrml .mal

ATTORNEY N. PETERS. rmldfimcgraphen Washinglom D. C.

FRED R. BRAINARD, OF ANNAPOLIS, MARYLAND,

ELECTRIC PUSHHBUTTON.

SPECIFICATION forming part of Letters Patent No. 355,858, dated January 11, 1887.

Application filed September 3, 1886. Serial No. 212,576. I (No model.)

State of Maryland, have invented certain new and useful Improvements in Electric Push- Buttons, of which the following is a specification. In many places the ordinary electric pushbutton cannot be used, as the action of moist salt-air or other corrosive atmospheric influences destroys the action of the ordinary pushbutton in a short time.

The object of my invention is to provide a new and improved push-button which cannot be affected by atmospheric ,or like influences, and which is simple in construction.

The invention consists in a casing fastened by a serew, to which one wire is connected, and a rubber or like expansible diaphragm held in the casing, and to which another wire is connected, whereby when the diaphragm is pressed downward the fastening devices of this "wire are brought in contact with the above mentioned screw and the circuit is closed.

In the accompanying drawings, Figure 1 is, a cross-sectional view of my improved pushbutton. Fig. 2 is a side view of the same, and

Fig. 3 is a top view.

Similar letters of reference indicate corresponding parts.

A circuit block or gasing, A, of rubber or other insulating material, is fastened by means of the screw B, in the countersink of which I one end of the wire 0 is passed, whereby the said wire is held in contact with the head of the screw, the .wire being passed through an aperture, D, in the block A. The block A is provided with an upwardly-projecting externallyscrew-th readed neck, on the top of which a plate'or diaphragm, E, of rubber or other "like expansible material, is placed, and on said neck of the block A a cap, F, is screwed,

which is provided'with an upwardly-projecting flange, which presses on the top of the diaphragm and presses said diaphragm firmly on the top edges of the neck, and thereby a firm and absolutely 'air and moisture tight joint is obtained. The other conducting-wire G is held by the screw II on the under side of the diaphragm or plate E, which screw is passed through the diaphragm and screws in a plate, J, on the upper surface of the diaphragm.

By pressing the diaphragm downward the screws H and B are brought in contact and the circuit closed, As soon as the pressure is removed from the diaphragm the spring-pressure of the diaphragm causes it to rise, thus breaking the circuit. The wires G and O are preferably twisted togcth er and passed through the apertures D, said wires being suitably insulated.

The push-button is simple in construction,

cheap, and can be more easily applied than.

the usual push-button.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a push-button, the combination, with a block having an upwardly-projecting screwneck, of a rubber plate or diaphragm placed on the top of the screw-neck, a cap screwed on the screw-neck and holding the rubber plate in place, a-contact-piece on the block, with which one of the connecting-wires is in contact, and a contact-piece on the under side of the diaphragm, substantially as shown and described.

2. In an electric push-button, the combination, with a block having an externallythreaded screw-neck, of a screw for holding the block in place, with which screw one of the wires is connected, a rubber plate on the top of the neck, a screw-cap screwed on the neck and holding the rubber plate in place, a plate on the top of the rubber, and held in place on the same by a screw projecting from the bottom surface of the rubber plate, to which screw the other connecting-wire is fast ened, substantially as shown and described.

In testimony that I claim the foregoing as myinvention I have signed my name in presence of two subscribing Witnesses.

FRED It! BRAINARD.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3699294 *May 18, 1971Oct 17, 1972Flex Key CorpKeyboard, digital coding, switch for digital logic, and low power detector switches
US4481815 *Dec 23, 1982Nov 13, 1984Overton Kenneth JTactile sensor
Classifications
Cooperative ClassificationH01H9/04