US3712036A - Cam wheel mechanism for watches - Google Patents

Cam wheel mechanism for watches Download PDF

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Publication number
US3712036A
US3712036A US00075028A US3712036DA US3712036A US 3712036 A US3712036 A US 3712036A US 00075028 A US00075028 A US 00075028A US 3712036D A US3712036D A US 3712036DA US 3712036 A US3712036 A US 3712036A
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US
United States
Prior art keywords
cam wheel
wheel
cam
lever
watch
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
US00075028A
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English (en)
Inventor
K Morita
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 US3712036A publication Critical patent/US3712036A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G04F7/0842—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms
    • G04F7/0847—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms with column wheel
    • 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

Definitions

  • An cam wheel mechanism adapted for application to stopwatch or chronograph arrangements in watches having a ratchet wheel superposed on and tightly fixed to a cam wheel for rotation about a common axis, An operating lever is positioned for engagement with a tooth of the ratchet wheel for the incremental rotation of said ratchet wheel and cam wheel.
  • the cam wheel is formed with alternating projections and recesses in the periphery thereof dimensioned for engagement or receipt of a corresponding projection on a start and stop lever biased against said cam wheel.
  • the projection on the start and stop lever, and the projections and recesses on said cam wheel cooperating to position the start and stop lever and the cam wheel between operative displacements of said operating lever without the use of a cam wheel spring.
  • This invention relates to a cam wheel mechanism particularly adapted for application to stopwatch or chronograph mechanisms.
  • the invention relates to a cam wheel adapted to control a start and stop lever without the use ofa cam wheel spring.
  • a push button is provided extending to the outside of the watch case, and operatively coupled with an operating lever, for the slidable displacement of said operating lever when said push button is pushed.
  • the inner end of said operating lever engages with a ratchet formed at the periphery of a column wheel. Pushing said push button serves to index the ratchet by one pitch, said ratchet then being positioned by a separate column wheel spring.
  • Said prior art column wheel is also provided with a plurality of columns projecting in substantially parallel relation from one face thereof. Each of said columns is radially spaced from the axis of rotation of the column wheel and circumferentially spaced from the other of said columns.
  • a start and stop lever is provided positioned so that when one end thereof engages the side surface of one of the columns, the other end thereof engages the side surface of the balance wheel, in the case of a stopwatch, or operates the clutch mechanism of a chronograph. This arrangement serves to stop the oscillation of the balance wheel or to operate the clutch of a chronograph to cut off said chronograph.
  • a cam wheel mechanism for a stopwatch or chronograph including a watch case, a push button projecting outside of said watch case, an operating lever positioned within said watch case for operative displacement by said push button, a ratchet wheel having a plurality of teeth, a cam wheel formed with a plurality of alternating radially extending projections and recesses in the periphery thereof, said cam wheel being superposed on and fixed to said ratchet wheel for rotation about a common axis, said ratchet wheel and cam wheel being positioned within said watch case with said ratchet teeth in the path of displacement of said operating lever for incremental rotation of said ratchet wheel and cam wheel in response to the displacement of said operating lever, and a start and stop lever pivotably mounted within said watch case and formed with a projection positioned and dimensioned for alternate engagement against said cam wheel projections and receipt within said cam wheel recesses for pivotably positioning said start and stop lever and for
  • FIG. 1 is a top plan view ofa portion of a watch construction incorporating the cam wheel mechanism according to the invention, the start and stop lever thereof being out of engagement with the balance wheel;
  • FIG. 2 is a top plan view of the embodiment of FIG. 1, the start and stop lever being positioned to stop the balance wheel;
  • FIG. 3 is a fragmentary top plan view of the cam wheel mechanism according to the invention as applied to a hand return mechanism.
  • the cam wheel construction according to the invention includes a push button 2 mounted on a watchcase 1.
  • An operating lever 3 having a elongated narrow slot 3a is mounted within said watchcase. Specifically, a pin 5 projecting perpendicularly from a frame plate 4 is received within slot 3a. End 3c of operating lever 3 is positioned in close proximity to the bottom of push button 2 due to the biasing force of operating lever spring 6 which engages a pin 3b mounted on said operating lever.
  • Operating lever 6 is formed with two apertures therethrough in the region thereof spaced from said operating lever, one of said openings being dimensioned to receive a pin 7 projecting perpendicularly from frame plate 4, the other of said openings receiving a screw 8 which secures said operating lever spring to said frame plate.
  • a cam wheel 10 having a plurality of projections 10a alternating with a plurality of recesses 10b is superposed on and tightly fixed to ratchet wheel 9 for rotation about a common axis 19 mounted on frame plate 4.
  • Cam wheel 10 has, for example, four projections and four recesses.
  • a start and stop lever 11 is pivotably mounted to frame plate 4 by means of a focrum l2. Said start and stop lever is biased against cam wheel 10 by means of a start and stop lever spring 13, which is also formed with two openings in a region thereof spaced from said start and stop lever. One of said openings is inserted in a pin 14 extending perpendicularly from frame plate 4, the other of said openings receiving a screw 15 securing said start and stop lever spring to said frame plate.
  • This method of mounting the springs of the construction according to the invention serves to substantially lessen the time for assembling and disassembling the components thereof.
  • Start and stop lever 11 is formed with a projection 11a positioned and dimensioned for receipt within the recesses 10b, as shown in FIG. 1, or engagement against projections 10a.
  • projection 11a serves to retain and position the assembly of said cam wheel and ratchet wheel between displacement of operating lever 3.
  • the frictional engagement between projection 11a and projection 10a is sufficient to retain said cam wheel and ratchet wheel assembly in position, despite the application of shocks to the watch.
  • Frame plate 4 is formed with a cut-out region 4a, a pin 16 being mounted at the end of start and stop lever 11 so as to project through said cut'out portion toward the inside of the watch movement.
  • the pin 16 serves to start or stop the balance wheel 17 by engaging against the side surface thereof.
  • a fixing pin 18 extends perpendicularly from frame plate 4 for the purpose of limiting the range of movement of lever 11.
  • ratchet wheel 9 is incrementally rotated by another pitch, in the manner described above, so that projection 11a engages with a projection 10a of cam wheel 10 to position said start and stop lever as shown in FIG. 1, whereby the balance wheel is restarted due to the frictional engagement between pin 16 and the side surface of said balance wheel during the disengagement thereof.
  • start and stop lever 11 serves to control the operation of a balance wheel
  • said start and stop lever may operate other mechanisms of the watch, if desired.
  • said lever may operate the clutch of a chronograph (not shown).
  • the cam wheel mechanism according to the invention is reference numerals 3', 5, 6', 9' and 20' are applied to components which correspond to like components in the embodiment of FIGS. 1 and 2.
  • a hammer 20 is pivotably mounted on the frame plate by means of a focrum 21, and is formed with a projection 20a.
  • Projection 20a is engaged against cam wheel 10 by hammer spring 22, which is secured to the frame plate in the manner described above in connection with spring 13.
  • a heart-shaped cam 23 would be mounted within the watch case and fixed to the second hand axis.
  • a device actuating lever coupled with a cam wheel may be provided for application with any of a number of watch devices, such as the balance wheel, a clutch mechanism, or a hand return mechanism.
  • a cam wheel mechanism for the selective operation of watch devices comprising a watch case; a push button projecting outside of said watch case; an operating lever positioned within said watch case for operative displacement by said push button; a ratchet wheel having a plurality of teeth; a cam wheel formed with a plurality of alternating radially extending projections and recesses in.
  • said cam wheel being superposed on and fixed to said ratchet wheel for rotation about a common axis, said ratchet wheel and cam wheel being positioned within said watch case with said ratchet wheel in the path of displacement of said operating lever for the incremental rotation of said ratchet wheel and cam wheel in response to the displacement of said operating lever; a device actuating lever pivotably mounted within said watch case and formed with a projection positioned for alternate engagement against said cam wheel projection and receipt within said cam wheel recesses, said device actuating lever projection and cam wheel being correspondingly dimensioned for the pivotable positioning of said device actuating lever and for retaining said cam wheel and ratchet wheel between operative displacements of said operating lever without the use ofa spring detent engaging said cam wheel; and spring means for biasing said device actuating lever against said cam wheel, said device actuating lever being positioned for operative cooperation with said watch device in response to the pivotable displacement of said device actuating ver in response to the displacement of said push button.
  • said heart-shaped cam being positioned for engagement by said hammer at one of the two pivotal positions thereof for rotatably positioning said heartshaped cam and shaft.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
US00075028A 1969-10-03 1970-09-24 Cam wheel mechanism for watches Expired - Lifetime US3712036A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1969094116U JPS4825156Y1 (fr) 1969-10-03 1969-10-03

Publications (1)

Publication Number Publication Date
US3712036A true US3712036A (en) 1973-01-23

Family

ID=14101448

Family Applications (1)

Application Number Title Priority Date Filing Date
US00075028A Expired - Lifetime US3712036A (en) 1969-10-03 1970-09-24 Cam wheel mechanism for watches

Country Status (4)

Country Link
US (1) US3712036A (fr)
JP (1) JPS4825156Y1 (fr)
CH (1) CH1463170A4 (fr)
GB (2) GB1311929A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823612A (en) * 1971-08-20 1974-07-16 Smiths Industries Ltd Trip mechanisms
EP1031896A1 (fr) * 1998-09-10 2000-08-30 Seiko Epson Corporation Dispositif de mesure du temps
US20110164477A1 (en) * 2002-02-01 2011-07-07 Lvmh Swiss Manufactures Sa Device comprising a clock movement and a chronograph module

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6466518B1 (en) * 1998-04-21 2002-10-15 Seiko Epson Corporation Time measurement device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US793320A (en) * 1902-01-16 1905-06-27 New Haven Clock Co Stop-watch.
US1851593A (en) * 1930-02-03 1932-03-29 Pastor Thomas Stop watch
CH285850A (fr) * 1950-07-31 1952-09-30 Excelsior Park Les Fils De Jea Pièce d'horlogerie.
US3045418A (en) * 1960-06-07 1962-07-24 Ed Heuer & Co Sa Time meter
GB994871A (en) * 1960-09-19 1965-06-10 Smith & Sons Ltd S Improvements in or relating to stop watches

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US793320A (en) * 1902-01-16 1905-06-27 New Haven Clock Co Stop-watch.
US1851593A (en) * 1930-02-03 1932-03-29 Pastor Thomas Stop watch
CH285850A (fr) * 1950-07-31 1952-09-30 Excelsior Park Les Fils De Jea Pièce d'horlogerie.
US3045418A (en) * 1960-06-07 1962-07-24 Ed Heuer & Co Sa Time meter
GB994871A (en) * 1960-09-19 1965-06-10 Smith & Sons Ltd S Improvements in or relating to stop watches

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823612A (en) * 1971-08-20 1974-07-16 Smiths Industries Ltd Trip mechanisms
EP1031896A1 (fr) * 1998-09-10 2000-08-30 Seiko Epson Corporation Dispositif de mesure du temps
EP1031896A4 (fr) * 1998-09-10 2000-11-02 Seiko Epson Corp Dispositif de mesure du temps
US6567345B1 (en) 1998-09-10 2003-05-20 Seiko Epson Corporation Clocking device
US20110164477A1 (en) * 2002-02-01 2011-07-07 Lvmh Swiss Manufactures Sa Device comprising a clock movement and a chronograph module
US20110164474A1 (en) * 2002-02-01 2011-07-07 Lvmh Swiss Manufactures Sa Device comprising a clock movement and a chronograph module
US8182138B2 (en) * 2002-02-01 2012-05-22 Lvmh Swiss Manufactures Sa Device comprising a clock movement and a chronograph module
US8308345B2 (en) 2002-02-01 2012-11-13 Lvmh Swiss Manufactures Sa Device comprising a clock movement and a chronograph module

Also Published As

Publication number Publication date
CH1463170A4 (fr) 1975-06-30
GB1311929A (en) 1973-03-28
GB1313089A (en) 1973-04-11
JPS4825156Y1 (fr) 1973-07-23

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