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Publication numberUS3389236 A
Publication typeGrant
Publication dateJun 18, 1968
Filing dateJun 30, 1966
Priority dateJun 30, 1966
Publication numberUS 3389236 A, US 3389236A, US-A-3389236, US3389236 A, US3389236A
InventorsGuthart Leo A
Original AssigneeAlarm Device Mfg Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Vibration actuated contact switch
US 3389236 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

- June 18, 1968 L. A. GUTHART VIBRATION ACTUATED CONTACT SWITCH Filed June 30, 1966 M m" A frim w 3 Pk 1 7 l r 7 Ill/17 zVA/A /1/6 7111/ By ATTORNEY UnitedStates Patent 3,389,236 Patented June 18, 1968 VIBRATION ACTUATED CONTACT SWITCH Leo A. Guthart, Old Westbury, N.Y., assignor to Alarm Device Manufacturing Company, a Division of Pittsburgh Railways Company, Inc., Carle Place, N.Y., a

corporation of Pennsylvania Filed June 30, 1966, Ser. No. 561,977 4 Claims. (Cl. Nil-61.48)

This invention relates to a vibration actuated switch incorporating novel means for securing the switch in unitary transversely keyed relation to a planar surface and for actuating the same on vibration of said planar surface. The switch thus actuates an electrical circuit, to signal acts such as for example, the applying of tools to the planar surface, or breaking or cutting the surface, forced entry, or otherwise vibrating the surface.

The switch is provided with parallel transverse serrations formed on the rear surface thereof to be thereby secured in keyed relation to the planar surface to be monitored and is sealed by a cover readily applied thereto, sealing the contacts and other parts thereof.

The switch is effective and reliable in operation, easy to install and rugged and durable in use.

The drawings, illustrating procedures and devices useful in carrying out the invention, and the description below, are exemplary only of the invention, which shall be deemed to cover all other devices and procedures coming within the scope and purview of the appended claims.

In the drawings, wherein similar reference characters indicate like parts:

FIG. 1 is a perspective view of a vibration actuated contact switch embodying the invention, shown secured to a planar surface whose vibration is to be monitored thereby, and showing also the leads to a signaling circuit controlled by the switch,

FIG. 2 is a transverse, vertical, sectional view thereof taken at line 2-2 of FIG. 1,

FIG. 3 is an enlarged, fragmentary, sectional view of parts thereof correspondingly shown in FIG. 2,

FIG. 4 is a top plan view thereof, taken at line 4-4 of FIG. 2, and

FIG. 5 is a bottom plan view thereof, taken at line 55 of FIG. 2.

As shown in the drawings, the switch of this invention comprises an elongated base member (FIGS. 2, 3) having formed coextensive with the outer planar face 16 thereof, a plurality of transverse serrations 19 formed transversely of the longitudinal axis of the face 16 and substantially coextensive therewith, for adhering contact with the planar plate surface 17 (FIGS. 1 and 3) to be monitored by the switch, as, for example, by an adhesive 18 applied (FIG. 2) to surface 16 so as to fill the interstices between the transverse serrations 19 and extending therebeyond, for transversely locking and keying the switch to the planar surface 17. To that end adhesive 18 may have readily evaporating volatile solvents. The adhesive layer, after application, dries to form the switch body and planar surface 17 into a solid, homogeneous unit with a plurality of related or parallel transverse key ing interstices thus assuring essentially integral direct transmission of the vibrations of surface 17 along the transverse serrations 19, actuating the switch as below set forth. Leads 20 (FIG. 1) are connected to the switch contact 34 (through 28, 25, 29) and contact 31 (through 33 FIG. 2) as below described. On vibration of the planar surface 17 as below described, the switch is actuated to control a circuit into which the leads 20 are cut, for actuating a warning signal or other electrical apparatus.

An elongated bracket (FIG. 3) is secured at one end, as at 26, to the base member 15 interiorly of the switch and opposite the transversely serrated outer face 16 thereof. The bracket 25 has an opposite free end 27, preferably offset therefrom. An elongated, flexible, vibratory strip 28 is fixed, at one end, to the interior of the base member in electrical contact with the end of the bracket, as through means 29, said strip having a free end 30 extending beyond the opposite end 27 of the bracket and in line with and spaced from a first contact 31, secured to the elongated base member 15 as at 32 (FIG. 2). A second contact 34 is secured to the flexible vibratory strip 28, as shown in FIG. 3, in line with the said first contact 31. Contacts 31, 24 may be of silver or other corrosion-resistant materials. A weight 35 may be secured to the flexible strip 28 at the said free end 30 thereof, for enhancing the pendulum reciprocation action of strip 28 on vibration of the surface 17, enhancing the switch-closing action on vibration of the switch. Adjustable means, such as screw 37, may be secured to the free end 27 of bracket 25, to contact and move the vibratory strip 28 to a precisely desired position, to thereby predetermine the exact spacing of the contacts 34 and 31 and thus the degree of vibration necessary to close the switch (dotted lines, FIG. 3).

The switch may be scaled by a cover 38, bolt 39 passing through the cover and engaging a threaded socket 41 or the like in the base member 15 (FIGS. 3 and 2).

The cover 38 is thus closed tightly and in dust-sealing relation to the switch body, effectively sealing the contact points against contamination. Said serrations 19 define, in use, a plurality of related, keying, interstices with which the adhesive 18 interlocks, keying the switch to surface 17. To that end the serrations 19 are interrelated in an arrangement to assure the elfective keying action described. Dne example of such arrangement is shown in FIG. 5 wherein the serrations 19 are arranged in parallel, spaced relation. They may be spaced in an arrangement other than parallel, as may be desired, to define interstices for achieving the adhesive keying action above noted. The example of transverse spaced parallel serrations 19 above noted is thus intended to illustrate a convenient form of carrying out the invention, which is not limited thereto and may be embodied in other forms pursuant to and embodying the invention.

While the foregoing disclosure of exemplary embodiments is made in accordance with the Patent Statutes, it is to be understood that the invention is not limited thereto or thereby, the inventive scope being defined in the appended claims.

I claim:

1. A vibration actuated contact switch comprising an elongated base member having an outer planar surface, serrations formed on said surface in relation to a planar plate surface for adhering keying contact therewith so that the vibration of said plate surface will be monitored by said switch, a bracket secured to the interior on the base member opposite and in parallel spaced relation to said serrated surface, a contact mounted in said switch, an elongated flexible strip fixed at one end to the interior of the base member with the other end being free, and freely movably extending in line with and spaced from said contact, means engaging the bracket and flexible strip for adjusting the position of the latter relative to said contact, whereby, on positioning the switch with said serrated face adhered to a planar surface to be monitored, and connecting said switch contact and flexible strip with a circuit, vibration of said planar surface will correspondingly vibrate the switch and thus said flexible strip will flex into engagement with said contact, actuating said circuit.

2. In a vibration actuated contact switch for connection with a circuit to be controlled thereby as set forth in claim 1, a second contact, fixed to the said free end of the flexible strip, for engagement with the first menticned contact on so flexing the strip.

3. In a vibration actuated contact switch for connection with a circuit to be controlled thereby as set forth in claim 1, a weight fixed to said flexible strip to enhance reciprocating pendulum movement thereof on vibration of said switch.

4. In a vibration actuated contact switch for connection with a circuit to be controlled thereby as set forth in claim 1, a second contact fixed to the flexible strip in line with the first mentioned contact for closing thereon on said flexing of the flexible strip, and a weight fixed to the free end of the flexible strip to enhance the reciproeating pendulum movement thereof.

References Cited UNITED STATES PATENTS 10 ROBERT K. SCHAEFER, Primary Examiner.

M. GINSBURG, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2741675 *Oct 22, 1952Apr 10, 1956Holmes Electric Protective ComVibration detecting device
US2942456 *Sep 10, 1954Jun 28, 1960Robertshaw Fulton Controls CoAcceleration responsive devices
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3671690 *Mar 16, 1971Jun 20, 1972Alarm Products Int IncVibrating switch
US3700841 *Apr 19, 1971Oct 24, 1972Wernig James HA switch for sensing displacement
US4249046 *Jun 11, 1979Feb 3, 1981General Motors CorporationInertia sensor switch
US4458241 *Sep 1, 1981Jul 3, 1984Psi LimitedDevice for protecting works of art
US4496809 *Oct 17, 1983Jan 29, 1985A B C Auto Alarms, Inc.Vibration sensitive trip switch for vehicle alarm system of the like
US4855544 *Sep 1, 1988Aug 8, 1989Honeywell Inc.Multiple level miniature electromechanical accelerometer switch
U.S. Classification200/61.48
International ClassificationH01H35/14
Cooperative ClassificationH01H35/144
European ClassificationH01H35/14C