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Publication numberUS3063234 A
Publication typeGrant
Publication dateNov 13, 1962
Filing dateFeb 26, 1957
Priority dateFeb 26, 1957
Publication numberUS 3063234 A, US 3063234A, US-A-3063234, US3063234 A, US3063234A
InventorsDetwiler Harry S
Original AssigneeHamilton Watch Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric timepiece contact bridge
US 3063234 A
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Description  (OCR text may contain errors)

Nov. 13, 1962 H. s. DETWILER 3,063,234

ELECTRIC TIMEPIECE CONTACT BRIDGE Filed Feb. 25, 1957 INVENTOR HARRY S. DETWILER ATTORNEY United States Patent 3,063,234 ELECTRIC TIMEPIECE CONTACT BRIDGE Harry S. Detwiler, Lancaster, Pa., assignor to Hamilton Watch Company, Lancaster, Pa., a corporation of Pennsylvania Filed Feb. 26, 1957, Ser. No. 642,541 11 Claims. (Cl. 58--28) This invention relates to a contact system supported on a bridge for an electric watch.

In electric watches where one side of the circuit is grounded, it is necessary to have the contact system completely insulated from the pillar plate and the remaining works of the watch and yet so positioned that it may be quickly accessible for adjustment or replacement.

It is an object of this invention to provide a bridge which can be quickly and easily removed and which supports the contact system, insulated from the bridge and the remainder of the watch in such a manner that it is easily accessible for adjustment or replacement.

It is a further object of the present invention to provide a bridge, supporting a pair of vertically adjustable frictionally held posts adapted to support adjustably rotatable collets carrying the contact making springs, and to support said posts in a manner so as to prevent shortcircuiting the contact system carried by the posts.

The invention is illustrated in the accompanying draw ing, in which:

FIGURE 1 is a top plan view of the bridge showing a portion of the carrying contact.

FIGURE 2 is a section on line 2-2 of FIGURE 1.

The bridge 12 is illustrated as substantially triangular shaped having a pair of pins 14 for locating and positioning the bridge on the watch proper, and a hole 15 receiving a hole down screw (not shown). The pins are friction fitted into holes 16. Substantially central of the bridge are a pair of holes 18 carrying insulated bushings 20 in which are mounted posts 22 and 24.

These posts are formed with shoulders 26 and 28 respectively on which are seated collets 30 and 32. The collet 30 has a rectangular shaped slot 34 for the reception of a rectangular shaped (in cross-section) contact spring 36. The collet 32 is similarly formed with a rectangular groove 38 for the reception of a trip spring member 40.

At a point in the length of the contact spring 36 and the trip spring member 40 the contact spring 36 and the spring member 40 contact each other. At that point a retainer 42 carried by the trip spring 40 encloses the contact spring 36. This engagement places stress on each of these members and this amount of stress is exceptionally important in making the correct contact pressure for the operation of the watch. It is therefore necessary to adjust the relative positions of the contact spring 36 and the trip spring member 40 by turning the collets 30 and 32 on the pins 22 or 24 respectively. Slot 31 and 33 in the collets 30 and 32 respectively are adapted to receive a screw-driver so they may be readily turned. This adjustment is extremely critical to the proper function and smooth performance of the watch.

There is another adjustment necessary to keep the contacts in position which is made by bending the pins 22 and 24. This adjustment is to maintain the contacts so that the longer vertical portion (cross-section) of the contact spring member and the longer vertical portion (cross-section) of the trip spring member remain substantially parallel to each other. To provide for this adjustment the post 22 is provided with an extension 48 projecting above the collet 30 for the reception of a socket member which can be put over the end 48 and by exerting sidewise pressure, bend the post 22 to provide for the substantially parallel arrangement of the long ice sides of springs 36 and 40. The extension 48 is formed with a groove 50 for the positive, insulated wire from a battery not shown, the negative side of the battery being grounded to the watch.

The bridge 12 must be capable of supporting the posts 22 and 24 in upright position and frictionally holding the bushings 20- and yet permit the rotation of the friction fitting collets 30 and 32 and the bending of the post 22. The tolerance maintained must be in the nature of .0001".

The bridge 12 is fitted into place and a screw in the hole 15 holds it securely. The posts 22 and 24 are vertically adjusted in the bushings 20 to align the contact spring and the trip spring at the proper height to engage the contact carried by the balance wheel. The collets are then rotated to cause the contact spring and trip spring to engage each other with the proper stress so that the pressure beween the balance wheel carried contact and the end of the spring contact will be equal during the contact making period. The contact spring and the trip spring are aligned so that their long sides are parallel. These adjustments are extremely critical.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by the United States Letters Patent is:

1. In a battery operated electric watch, a contact supporting bridge comprising a body portion, insulating means carried by said body portion, vertically adjustable supports mounted in said insulating means, a first contact spring carrier on one of said supports, a second spring carrier on the other of said supports, a first contact spring carried by said first contact spring carrier and a second spring engageable with said first contact spring carried by said second spring carrier.

2. A battery operated electric watch according to claim 1 in which the first contact spring carrier and the second spring carrier are rotatably adjustable to adjust the contact pressure between said first contact spring and said second spring.

3. In a battery operated electric watch, a contact sup porting bridge comprising a substantially triangular shaped body portion, means positioning said body portion in proper location to the rest of the watch, insulating bushings carried by said body portion, posts frictionally held in said bushing to permit vertical adjustment, collets car ried by said posts, means providing rotational adjustment of said collets on said posts, a first spring contact carried by one of said collets and a second spring engageable with said first spring contact carried by the other of said collets.

4. An electric timepiece including a contact-supporting bridge; a plurality of electrically insulating supports frie tionally mounted on said bridge; a contact spring carried by one of said supports; a second spring engageable with said contact spring and carried by a second one of said supports; the friction mounting of said supports permitting longitudinal adjustment of said supports in a direction normal to said bridge to permit variation in the distance separating said springs and said bridge.

5. An electric timepiece as defined in claim 4 wherein said friction mounting of said supports also permits their rotation about their longitudinal axes to permit variation of the tension upon said contact spring.

6. A contact system for an electric timepiece comprising a contact-supporting bridge; a plurality of electrically insulating supports frictionally mounted on said bridge; a contact spring carried by one of said supports; a second spring engageable with said contact spring and carried by a second one of said supports; the friction mounting of said supports permitting longitudinal adjustment of said supports in a direction normal to said bridge to permit variation in the distance separating said springs and said bridge.

7. An electric timepiece including a contact-supporting bridge; a plurality of electrically insulating supports carried by said bridge; each of said electrically insulating supports comprising an insulating bushing mounted on said bridge, a post frictionally mounted in said insulating bushing, and a mounting sleeve secured on said post; an elongated contact spring supported by one of said mounting sleeves in substantially parallel relationship to said bridge; a second elongated spring engageable with said contact spring and carried by a second one of said mounting sleeves in substantially parallel relationship to said contact spring; said supports being vertically adjustable relative to said bridge to permit adjustment in the distance betwen said bridge and said springs; and at least one of said electrically insulating supports being rotatable about its longitudinal axis to permit variation in the tension upon said contact spring.

8. A timepiece as defined in claim 7 wherein said mounting sleeves are slotted to provide means to rotate them about the longitudinal axis of said posts.

9. An electric timepiece including a contact-supporting bridge; an elongated contact spring; a second elongated spring engageable with said contact spring; electrically insulating support means supporting said contact spring and said second spring on said bridge and in substantially parallel relationship to said bridge and to one another; the portion of at least one of said contact and second springs which is attached to said support means being pivotable about a vertical axis to permit variation of the Lat tension upon said contact spring; said contact and second springs being further adjustable in a direction normal to said bridge to permit adjustment in the distance between said bridge and said springs.

10. A timepiece as defined in claim 9 wherein said electrically insulating support means includes two posts, on

one of which said contact spring is mounted and on the other of which said second spring is mounted; said posts being constructed of readily bendable material to permit them to be bent transversely of their longitudinal axes for varying the position of said springs.

11. A contact system for an electric timepiece comprising a contact-supporting bridge; an elongated contact spring; a second elongated spring engageable with said contact spring; electrically insulating support means supporting said contact spring and said second spring on said bridge and in substantially parallel relationship to said bridge and to one another; the portion of at least one of said contact and second springs which is attached to said support means being pivotable about a vertical axis to permit variation of the tension upon said contact spring; said contact and second springs being further adjustable in a direction normal to said bridge to permit adjustment in the distance between said bridge and said springs.

References Cited in the file of this patent UNITED STATES PATENTS 632,128 Krahenbuhl Aug. 29, 1899 2,377,276 Sperry et a1 May 29, 1945 2,685,164 Grillet et a1 Aug. 3, 1954 2,806,908 Van Horn et al Sept. 17, 1957 2,883,827 Ensign et al Apr. 28, 1959 FOREIGN PATENTS 549,785 France Nov. 28, 1922 165,203 Switzerland Feb. 1, 1934

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US632128 *Jun 16, 1896Aug 29, 1899Ernest KrahenbuhlWatch-plate.
US2377276 *Nov 22, 1941May 29, 1945Waltham Watch CoElectric clock
US2685164 *May 5, 1952Aug 3, 1954Grillet Antoine CFrame for timing movements and instruments and method of assembling
US2806908 *Jan 27, 1954Sep 17, 1957Hamilton Watch CoContact mechanism for battery operated watch
US2883827 *Aug 4, 1953Apr 28, 1959Elgin Nat Watch CoElectrically actuated horological instrument
CH165203A * Title not available
FR549785A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3937002 *Aug 20, 1974Feb 10, 1976Bulova Watch Company, Inc.Solid state, battery operated electronic watch having arm-actuated battery switch
Classifications
U.S. Classification368/164, 200/19.1, 200/281, 368/177, 968/470
International ClassificationG04C3/00, G04C3/06
Cooperative ClassificationG04C3/06
European ClassificationG04C3/06