US3518826A - Return mechanism for stopwatches - Google Patents

Return mechanism for stopwatches Download PDF

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Publication number
US3518826A
US3518826A US741595A US3518826DA US3518826A US 3518826 A US3518826 A US 3518826A US 741595 A US741595 A US 741595A US 3518826D A US3518826D A US 3518826DA US 3518826 A US3518826 A US 3518826A
Authority
US
United States
Prior art keywords
hammer
base plate
minute
adjusting plate
heart
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US741595A
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English (en)
Inventor
Naoki Takashina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Application granted granted Critical
Publication of US3518826A publication Critical patent/US3518826A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/04—Measuring, counting, calibrating, testing or regulating apparatus for gearwork
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0804—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms
    • G04F7/0814—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms with double hammer, i.e. one hammer acts on two counters

Definitions

  • a return mechanism for stopwatches including a hammer pivotaly mounted on the base of said stopwatch and formed with acting surfaces adapted to operatively engage the minute heart and second heart respectively and means for displacing the point of pivotable mounting of the hammer along the base plate so that said hammer acting surfaces will operatively engage both the minute and second hearts at the zero position thereof.
  • This invention relates generally to the return mechanism of stopwatches.
  • the return of both the minute and second hands of a stopwatch to zero is accomplished by means of a hammer provided with two acting surfaces which operatively engage a minute heart and a second heart respectively set on the minute hand arbor and the second hand arbor.
  • minor errors in each part of the mechanism inevitably result in a small interstice between one of the acting surfaces of the hammer and the face of either the minute heart or second heart. This results in the failure of either the minute or second hands to precisely return to the zero position.
  • the known method of correcting the aforedescribed condition consists of filing down the acting surface in contact with one of the two hearts until both acting surfaces are in contact with their respective heart cam.
  • a return mechanism for stopwatches having a hammer pivotally mounted on the base plate of said stopwatch and formed with acting surfaces adapted to operatively engage the minute heart and second heart respectively, is provided with means for displacing the point of pivotable mounting of said hammer along said base plate so that said hammer acting surfaces will operatively engage both said minute and second hearts at the zero position thereof.
  • the displacing means preferably comprises two spaced pins extending from the base plate and an adjusting plate having the hammer pivotably mounted thereon and having a plurality of sets of correspondingly spaced apertures formed therein, each of said sets of apertures being adapted to receive the pins therein to firmly maintain the adjusting plate relative to the base plate.
  • the adjusting plate upon which the hammer is pivotably mounted is formed with at least two uniformly spaced internal cam surfaces adapted to engage spaced pins upstanding from the base plate to firmly maintain the adjusting plate relative to said base plate in a plurality of positions.
  • a third embodiment of the invention consists of an adjusting plate pivotably mounted on the base plate, the hammer being pivotably mounted on said adjusting plate at a point spaced from the point of pivotable mounting of said adjusting plate, and means for fixing the adjusting plate is a plurality of positions about the point of pivotal mounting thereof.
  • Another object of the invention is to provide a return mechanism for stopwatches which is readily adjustable without requiring filing of the acting surfaces of the hammer.
  • FIG. 1 is a plan view of the first embodiment
  • FIG. .2 is a cross-section of the principal part of the first embodiment
  • FIG. 3 is a plan view of the principal part of the first embodiment
  • FIG. 4 is a plan view of the principal part of the second embodiment
  • FIG. 5 is a plan view of the principal part of the third embodiment.
  • FIG. 6 is a cross-section of the principal part of the third embodiment.
  • FIGS. 1-3 wherein the embodiment according to the invention is shown.
  • the hammer 1 is provided with two acting surfaces 2 and 3, a projection 4 which touches projection 21 of the operating lever 18, an aperture 5 and a projection 7 which is pressed by a spring 13 and is turned clockwise under the action of said spring.
  • the minute heart 10, operatively engaged by the acting surface 2 is carried on the minute hand arbor 9 and the second heart 12, operatively engaged by the acting surface 3, is carried on the second hand arbor 11.
  • a projection 8 touches a pillar wheel (not shown in the drawings) to check the turning of this hammer, but also the hammer to turn clockwise due to the turning of said pillar wheel when both the minute and second hands stand still.
  • the adjusting plate 14 is, at the center, provided with a pivot 15 which holds said hammer 1 by a hole 6 and is provided with apertures or setting holes A-A', B-B', CC', and D-D which face each other respectively.
  • the space between the setting holes comprising each set of facing setting holes is equally to that between the two supporting pins 16 and 16' upstanding from the base plate 17.
  • segments of a line are a 3 and each difference is of the 7 two pins 16 and 16 serve as supports for the adjusting plate 14 to firmly maintain said adjusting plate relative to base plate 17 when the pins are receivedwithin one of the sets of setting holes A-A, B-B', C-C' and D-D'.
  • Operating lever 18 is fitted on pivot 19 of base plate 17 and is provided with an operating face 20 and a projection 22 which is pressed by the spring 23, the action of which turns lever 18 couterclockwise.
  • any slight clearance between the heart cam and the hammer is easily correctable by providing emans for displacing the point of pivotal mounting of hammer 1 along base plate 17.
  • the adjusting plate 14 is so positioned that one of the sets of setting holes AA, B-B', C-C', D-D thereof is fitted to the pins 16 and 16' of the base plate 17, to receive said pins therein to firmly maintain and support said adjusting plate relative to said base plate.
  • the point of pivotable mounting of hammer 1 may be displaced by removing said adjusting plate so that another of said sets of setting holes is fitted to said pins.
  • said adjusting plate is formed with two uniformly spaced cam surfaces 24 and 25 which define a plurality of sets of center points E-E','F-F', G-G', H-H' and I-I which are adapted to receive pins 16 and 16' upstanding from 'base plate 17.
  • adjusting plate 14 is so positioned that one of said sets of center points is fitted to said pins, said adjusting plate is firmly maintained and supported relative to base plate 17.
  • the point of pivotable mounting 15 of hammer 1 may be displaced by removing adjusting plate 14 and fitting another of said sets of center points to said pins.
  • the adjusting plate 14 is provided with a setting hole 26 and an arcuate slot 27 uniformly spaced along its length from setting hole 16.
  • the pivot 15 is located between said setting hole and slot.
  • Setting hole 26 isfitted to a supporting pin 16 upstanding from base plate 17.
  • the point of pivotable mounting of hammer 1 may be displaced by pivoting the adjusting plate 14 about support pin 16.
  • means are provided for fastening the adjusting plate 14 to base plate 17 such as screw 16 which extends-through slot 27 to said base plate.
  • the return mechanism forstopwatches according to the invention oifers substantial advantages over the known arrangements in that it permits,' by means of a simple adjustment, the elimination of .any clearance between the operating surfaces of the hammer and the respective second and minute heart cams at their zero positions. Further, despite the ease of adjustment, the adjusting plate, having the hamer pivotably mountedthereon, is very securely fastened to the base plate, so that the adjustment is not disturbed despite the pressure of the various springs.
  • the improvement which comprises means for displacing the point of pivotable mounting of said hammer along said base plate so that said hammer acting surfaces will operatively engage both said minute andsecond hearts at the zero position thereof, said displacing means comprising at least two spaced pins upstanding from said base plate and an adjusting plate having a plurality of sets of corresponding spaced apertures therein, each of said sets of apertures being adapted to receive said pins therein to firmly maintain said adjusting plate relative to said base plate, said hammer being pivotably mounted on said adjusting plate, whereby the point of pivotable mounting of said hammer is displaced along said base plate when said adjusting plate disposed so that said pins received in one of said sets of apertures, is moved so that said pins are received in
  • the improvement which comprises means for displacing the point of pivotable mounting of said hammer along said base plate so that said hammer acting surfaces will operatively engage both said minute and second hearts at the zero position thereof, said displacing means comprising at least two spaced pins upstanding from said base plate and an adjusting plate having said hammer pivotably mounted thereon'and having at least two internal cam surfaces formed therein, said cam surfaces being spaced and adapted to receive and retain said pins therebetween at each of a plurality of distinct positions to maintain said adjusting plate relative to said base plate, whereby the point of pivotable mounting of said hammer is displaced along said base plate when said adjusting plate, disposed so that said pins received by said internal cam 6 surfaces at one of said positions, is moved so that said

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Electromechanical Clocks (AREA)
US741595A 1967-08-21 1968-07-01 Return mechanism for stopwatches Expired - Lifetime US3518826A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5330167 1967-08-21

Publications (1)

Publication Number Publication Date
US3518826A true US3518826A (en) 1970-07-07

Family

ID=12938886

Family Applications (1)

Application Number Title Priority Date Filing Date
US741595A Expired - Lifetime US3518826A (en) 1967-08-21 1968-07-01 Return mechanism for stopwatches

Country Status (4)

Country Link
US (1) US3518826A (de)
DE (1) DE1773368C3 (de)
FR (1) FR1572002A (de)
GB (1) GB1180366A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3701250A (en) * 1970-12-28 1972-10-31 Xerox Corp Adjustable return mechanism for a watch
US3796041A (en) * 1971-08-20 1974-03-12 Smiths Industries Ltd Reset mechanisms
US20080043576A1 (en) * 2006-08-15 2008-02-21 Karl-Friedrich Scheufele Zero-resetting device for a timepiece
US20080291785A1 (en) * 2005-11-24 2008-11-27 Laurent Perret Timepiece Hammer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH271999A (fr) * 1948-04-21 1950-11-30 Vve James Aubert & Cie Chronographe.
CH279962A (fr) * 1949-11-26 1951-12-31 D Horlogerie Minerva Sport S A Compteur de temps.
CH285850A (fr) * 1950-07-31 1952-09-30 Excelsior Park Les Fils De Jea Pièce d'horlogerie.
DE1003141B (de) * 1952-10-30 1957-02-21 Jeanneret & Co R Stoppuhr

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH271999A (fr) * 1948-04-21 1950-11-30 Vve James Aubert & Cie Chronographe.
CH279962A (fr) * 1949-11-26 1951-12-31 D Horlogerie Minerva Sport S A Compteur de temps.
CH285850A (fr) * 1950-07-31 1952-09-30 Excelsior Park Les Fils De Jea Pièce d'horlogerie.
DE1003141B (de) * 1952-10-30 1957-02-21 Jeanneret & Co R Stoppuhr

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3701250A (en) * 1970-12-28 1972-10-31 Xerox Corp Adjustable return mechanism for a watch
US3796041A (en) * 1971-08-20 1974-03-12 Smiths Industries Ltd Reset mechanisms
US20080291785A1 (en) * 2005-11-24 2008-11-27 Laurent Perret Timepiece Hammer
US7553067B2 (en) * 2005-11-24 2009-06-30 Vaucher Manufacture Fleurier S.A. Timepiece Hammer
CN101313258B (zh) * 2005-11-24 2010-11-03 弗勒里耶沃谢制造股份有限公司 钟表锤
US20080043576A1 (en) * 2006-08-15 2008-02-21 Karl-Friedrich Scheufele Zero-resetting device for a timepiece
US7422364B2 (en) * 2006-08-15 2008-09-09 Chopard Manufacture S.A. Zero-resetting device for a timepiece

Also Published As

Publication number Publication date
DE1773368B2 (de) 1973-12-20
FR1572002A (de) 1969-06-20
DE1773368C3 (de) 1974-07-11
GB1180366A (en) 1970-02-04
DE1773368A1 (de) 1971-02-18

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