US3668863A

US3668863A - Jumper member construction in a calendar watch

Info

Publication number: US3668863A
Application number: US166531A
Authority: US
Inventors: Mamoru Miyasaka
Original assignee: Suwa Seikosha KK
Current assignee: Suwa Seikosha KK
Priority date: 1970-07-30
Filing date: 1971-07-27
Publication date: 1972-06-13
Anticipated expiration: 1989-06-13
Also published as: DE2138226C3; DE2138226A1; GB1356424A; HK41176A; DE2138226B2

Abstract

In a calendar watch, a jumper mechanism for operating with a toothed member such as a calendar wheel comprises a thin plate connected to a jumper by means of a flexible arm. The plate is mounted above a base plate in a construction such that the jumper lies out of the plane of the thin plate between the thin plate and the base plate.

Description

United States Patent Miyasaka 51 June 13, 1972 JUMPER MEMBER CONSTRUCTION IN [56] References Cited A CALENDAR WATCH UNITED STATES PATENTS [72] Inventor: Mnmoru Miylsakn, Shimosuwa, Japan 3,495,395 2/ i970 Fehrenbach et al. ..58/58 [73] Assignee: Knbushikl Knish: Suwa Seikosha, Tokyo, FOREIGN PATENTS ()R APPLICATIONS J an 285,530 9/1952 Switzerland ..58/58 [22] Filed: July 27, 197i Primary .raminerRichard B. Wilkinson [2]] Appl' 166531 Assistant ExaminerGeorge H. Miller. Jr.

Attorney-Alex Friedman, et al. [30] Foreign Application Priority Data [57] ABSTRACT July 30, 1970 Japan 4505484 In a calendar watch. a jumper mechanism for operating with a [52] [1.8.0 ..58/58 toothed member Such as a Calendar whee] comprises a thin [5 U Int Cl G04. 9/24 plate connected to a jumper by means of a flexible arm. The l 58] i M 5 58 1 plate is mounted above a base plate in a construction such that the jumper lies out of the plane of the thin plate between the thin plate and the base plate.

3 Clairm, 3 Drawing Figures PATENTEDJUH 13 I972 FIG. 2

L E\TOR. MAMORU MQYASAKA BY a,

ATTORNEYS JUMPER MEMBER CONSTRUCTION IN A CALENDAR WATCH BACKGROUND OF THE INVENTION In a conventional calendar watch, a jumper is pressed against a date wheel by a spring and is mounted to a plate by means of a jumper holder. However, in the process of assembly, and during repair work, it is difficult to assemble the parts due to the fact that the spring must be mounted in stressed conditions in a hollow, and that the number of parts which must be handled simultaneously is inconvenient, especially with respect to mass production.

SUMMARY OF THE INVENTION A date wheel holder is connected by a flexible arm to a jumper, the three parts being cut from a single thin plate. The date wheel holder is mounted above a base plate. In operating position, the jumper, on its flexible arm, is bent so that it lies between the date wheel holder and the base plate. Flexing of the arm provides the force needed for rapid intermittent motion of the date wheel.

Accordingly, an object of the present invention is to provide a jumper, biased by a spring, and a date wheel holder in one piece.

Another object of the invention is to decrease the number of parts required in connection with a date wheel in a calendar watch.

A further object of the invention is a date wheel mechanism which is easier to assemble than the present constructions and which is less expensive.

Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification.

The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the invention will be indicated in the claims.

BRIEF DESCRIPTION OF THE DRAWING For a fuller understanding of the invention, reference is had to the following description taken in connection with the accompanying drawing, in which:

FIG. 1 is an enlarged plan view of a spring member in accordance with the present invention;

FIG. 2 is an enlarged partial plan view of a watch showing the spring member ofFIG. I in place; and

FIG. 3 is an enlarged cross-sectional view taken along the lines 33 of FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT In accordance with the present invention, a one-piece spring member consists of a date wheel holder 11 and a jumper I2 connected to the date wheel holder 11 by a jumper spring 13. The jumper spring I3 is separated from the date wheel holder 11 by a space 14, the flexibility of the jumper spring I3 being such that the jumper I2 can be moved across the space 14 and bent transversely of the plane of the date wheel holder 11 so that the jumper 12 can be disposed below the plane of the spring member.

In the calendar watch are a base plate I5 (FIGS. 2 and 3) and a date wheel 16. The plate I5 has a recess 17 into which the date wheel 16 fits. Also, it has a recess 18 which is bridged by the date wheel holder 11. The jumper 12, during assembly is pushed toward and under the date wheel holder II, against the force exerted by the stressed jumper spring I3. The jumper is held in this position by the date wheel 16. The edge of the jumper 12 which is pressed against the teeth of date wheel I6 is V-shaped to provide a desired cam-action. The action results in the slow movement of the date wheel until a tooth passes over the apex of the V, at which point the jumper causes the tooth, and thereby the date wheel, to advance rapidly. The desired sudden, intermittent motion of the date wheel is achieved by this means, and the components of the mechanism are so located that the sudden motion occurs at l2 o'clock.

It will thus be seen that the objects set forth above, among those made apparent from the preceding description, are effciently attained and, since certain changes may be made in the above construction without departing from the spirit and scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

What is claimed is:

I. In a watch, a jumper construction comprising a base plate having a wall, a toothed member adjacent said base plate and a one-piece spring member secured to said base plate above said wall, and serving to hold said toothed member in place, said spring member including a jumper part engaging said toothed member and a spring part urging said jumper against said toothed member, said jumper member lying between said spring member and said wall of said base plate and being limited with respect to movement by said spring member and said wall of said base plate.

2. The jumper construction as defined in claim I, wherein said wall is recessed in that portion adjacent said spring part and said jumper part, saidjumper member lying in said recess.

3. The jumper construction as defined in claim I, wherein said toothed member is a date wheel.

Claims

1. In a watch, a jumper construction comprising a base plate having a wall, a toothed member adjacent said base plate and a one-piece spring member secured to said base plate above said wall, and serving to hold said toothed member in place, said spring member including a jumper part engaging said toothed member and a spring part urging said jumper against said toothed member, said jumper member lying between said spring member and said wall of said base plate and being limited with respect to movement by said spring member and said wall of said base plate.

2. The jumper construction as defined in claim 1, wherein said wall is recessed in that portion adjacent said spring part and said jumper part, said jumper member lying in said recess.

3. The jumper construction as defined in claim 1, wherein said toothed member is a date wheel.