US3888077A - Mechanical watch movement - Google Patents

Mechanical watch movement Download PDF

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Publication number
US3888077A
US3888077A US465077A US46507774A US3888077A US 3888077 A US3888077 A US 3888077A US 465077 A US465077 A US 465077A US 46507774 A US46507774 A US 46507774A US 3888077 A US3888077 A US 3888077A
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United States
Prior art keywords
wheel
pinion
minute
teeth
hour
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
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US465077A
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English (en)
Inventor
Peter Bachmann
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.)
Ebauches Bettlach SA
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Ebauches Bettlach SA
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/02—Back-gearing arrangements between gear train and hands
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/027—Wheels; Pinions; Spindles; Pivots planar toothing: shape and design

Definitions

  • a mechanical watch movement comprising a minute wheel and pinion, a cannon pinion with a toothing which meshes with that of the minute-wheel and an hour-wheel coaxial with the cannon-pinion and cooperating with the minute-wheel pinion, wherein the minutewheel pinion is thicker than the minute-wheel, the minute-wheel pinion further comprises teeth each having for at least a portion of its thickness a lateral face in the form of an arc of a cylinder coaxial with the minute-wheel pinion whereas some of the teeth each have a point extending beyond the lateral face said lateral face thus being thinner than the minutewheel pinion, the minute-wheel is driven onto the lateral faces and the outside diameter of the toothing of the hour-whee] is such that only the points cooperate with the hour-wheel toothing.
  • the cannon-pinion bears a minute-hand at the end of its pipe, while the hour-wheel itself bears an hour-hand.
  • the pipe of the cannon-pinion and that of the hourwheel pass through a central opening in the dial. the latter being placed directly against the outer face of the base plate.
  • the reduction ratios between the cannon-pinion and the minute wheel on the one hand. and between the cannon-pinion and the minute-wheel on the one hand, and between the minute-wheel pinion and the hour-wheel on the other hand. must he such that their product equals 12.
  • the minutewheel and pinion constitute the driving members of the dial-train; and when the minute-wheel and pinion are directly coupled to the barrel-drum. the movement must be designed in such a way that the barrel-drum rotates at a speed determined by the said reduction ratios.
  • Watch movements are also known in which the cannon-pinion and the hour-wheel carry discs entirely cov ered by the dial. These discs bear minuteand hourindications which appear in an aperture in the dial.
  • the hour-wheel is generally driven by jumps of one-twelfth of a revolution per hour, whereas the cannon-pinion is driven in continuous mo tion.
  • the minute-wheel and pinion of mechanical watch movements often comprise a pinion which is thicker than the wheel, the latter being driven onto a cylindrical bearing surface produced by lathe-turning on a portion of the thickness of the pinion.
  • the teeth of the pinion are eliminated, and its hub is reduced in diameter for as much of its thickness as is necessary for driving on the minute-wheel.
  • the minute-wheel and pinion are intended to drive a jumping hour-wheel. on the other hand.
  • different designs are used. with the minute-wheel and pinion comprising a twoor three-tooth star in the center.
  • a more particular object is to enable the production of both movements with hourand minute-hands and movements equipped with hourand minute-indicating discs starting from the same caliber and using the same elements to the greatest extent possible.
  • the minute-wheel pinion is thicker than the minute-wheel, and the minutewheel is driven onto the teeth of the minute-wheel pinion.
  • FIG. 1 is a partial axial section of the first embodiment.
  • FIG. 2 is a partial top plan view on a larger scale of the minutewheel and pinion of the movement shown in FIG. 1.
  • FIG. 3 is a partial section analogous to that of FIG. 1. showing the second embodiment
  • FIG. 4 is a top plan view of the hounwheel and the minute-wheel and pinion in the second embodiment
  • the movement partially illustrated in FIG. I is of simplified construction. It comprises a frame consisting of a hase-plate l. a wheel-train bridge 2, and a balance cock (not shown). these various elements being fus tened to one another by pillars. such as pillar 3, riveted to the base-plate 1 and to one of the bridges.
  • a mainspring is fitted in a harreLdrum 4 situated between the bridge 2 and the baseplate l and mounted on a detachable arbor 5 which is axially fastened by a bolt 6 mak ing it axially integral with the hub of the drum 4.
  • a ratchet-wheel 7 integral with a sleeve 8 which is situated in side the drum 4 and serves to hook the inner end of the mainspring.
  • the arbor 5 pivots in an opening in the bridge 2 and a corresponding opening in the base-plate I. It projects into a recess 9 in the outer face of the base-plate l and is provided with a square 10 at the end of it.
  • Engaged on the square 10 is a non-circular central opening of a minute-wheeLand-pinion assembly ll which is fitted in the recess 9 and which rotates with the barrel-drum 4.
  • the minute-wheel 12 of this assembly 11 meshes with a cannon-pinion 13.
  • the cannon-pinion 13 is mounted on an inner pipe 16 integral with the baseplate I.
  • the Cannon'pinion pipe proper and the pipe of the hour-wheel 15 pass through a central opening in a dial (not shown) and bear a minute-hand and an hourhand. respectively. at their ends.
  • the movement described further comprises a fourth-wheel-and-secondpinion assembly 17. the arbor of which is engaged in the inner pipe 16; this assembly 17 forms part of the wheel-train connecting the barrel-drum 4 to an escapement (not shown).
  • the ratchetwheel 7 is blocked by a click l8 actuated by a spring (not shown) and pivoting on a cylindrical bearing surface of the pillar 3.
  • the gear ratios between the wheel 12 and the cannon-pinion 13 on the one hand. and between the pinion l4 and the wheel 15 on the other hand, must be such that the cannonpinion 13 rotates at the rate of one revolution per hour. while the wheel 15 rotates at the rate of one revolution every twelve hours. Moreover. for reasons which will become apparent later on. the speed of rotation selected for the barrel 4 is one revolution every 4 hours. As a result, the gearratio between the wheel 12 and the cannon-pinion 13 is 4:1. while the reduction-ration between the pinion 14 and the wheel 15 is 1:3.
  • the structural details of the minutc-wheel-andpinion assembly 11 are shown in FIG. 2.
  • the pinion 14 has a peripheral toothing made up of 12 teeth 19. the tracing of which is visible in FIG. 2. This tracing is that ofa standard toothing, the teeth of which are cut off at approximately half their height by lateral faces 20 in the form of portions of a cylindrical surface coaxial with the pinion 14. Thus all the teeth 19 are cut off at the same height. and the lateral faces 20 define an imaginary cylindrical surface which constitutes the envelope of the pinion I4.
  • the wheel 12 has a circular central opening 21. the diameter of which is the same as that of the imaginary cylindrical surface defined by the lateral faces 20.
  • the wheel I2 is driven directly onto the teeth I) and extends between the middle of the thickness of the pinion I4 and one of its frontal faces, so that the truncated teeth I9 are free for approximately half the thickness of the pinion I4.
  • the hour-wheel has a lib-tooth toothing 22 with a normal tracing and a module equal to that of the toothing I9. These standard-profile teeth mesh with the teeth I) even though the latter are truncated at mid-height, as may be seen in FIG. 2, so that the pinion described drives the wheel I5. which rotates continuously, completing one revolution every l2 hours.
  • the assembly I1 is completely sunk into the recess 9.
  • the wheel 12 is engaged with a scttingwheel (not shown) which cooperates with the other members of the setting mechanism and which likewise pivots on the outer face of the baseplate I.
  • the minutc-wheel and pinion may be dismantled very easily, and after they have been removed, it is possible to extract the arbor 5 by grasping it by a projecting head 23, which enables the barrel to be taken out laterally.
  • FIGS. 3 and 4 The second embodiment, shown in FIGS. 3 and 4, is based on an identical caliber to that of FIG. 1.
  • FIG. 3 again shows the base-plate l with its recess 9 and the barreLarbor 5.
  • the barrel 4 and the elements of the wheel train are also identical.
  • the barrel 4 and the arbor 5 likewise rotate at a speed of one revolution every four hours.
  • a minutewheel-and-pinion assembly 24 is composed here of a toothed disc, identical to that of the first embodiment and accordingly designated by the reference numeral 12, and a pinion 25 of a slightly different design.
  • This pinion 25 is of the same thickness as the pinion 14, and its central opening is likewise of the same size and shape.
  • its toothing differs in that it comprises eight teeth 26 identical to the teeth 19, i.e., laterally limited by lateral faces in the form of cylindrical portions coaxial with the pinion, and four teeth 27 which, as may be seen in FIG. 3, have a lateral face 28, in the form of a portion of a cylindrical surface of the same diameter as the faces 20, for about half of their thickness.
  • the diameter of the circle defined by the apexes of the teeth 30 is such that the wheel 29 can rotate freely without coming into contact with the teeth 26 of the pinion 25 but is caught by the points 27a of LII the teeth 27.
  • the dimensions are such that each point 271: can displace the wheel 29 by an angle sufficient for the apex 32 of the point of the jumper 31 to pass over the apex of one of the teeth 30.
  • advances the wheel 29 to the position shown by the dash-line in FIG. 4, where the two flanks ofthc jumper 31 are simultaneously in contact with two of the teeth 30.
  • the pinion 25 ad vances the hounwheel 29 by jumps of one twelfth of a revolution every time the pinion 25 rotates
  • the pipes (not shown) of the cannon-pinion 33 and of the wheel 29 will be shorter than in the first embodiment, and they carry a minutedisc and an hour-disc (not shown), respectively.
  • These discs will be situated between the base-plate l and the dial (not shown), and the minute' and hour-indications printed along the peripheries ofthe discs will appear in an aperture in the dial.
  • the fourth wheel-and-second-pinion assembly 17 will not comprise any pivot intended to receive the seconds-hand. and the dial need not have a central opening.
  • the teeth 27 might also be full for their entire thickness. In that case, the central opening of the disc 12 will be blanked with notches corresponding to the teeth 27 so that this disc can be driven onto the pinion.
  • the pinion 14 can be made either by blanking from a circular disc or by milling a standard toothing at the periphery of the disc, then lathe-turning the teeth to the diameter defined by the faces 20, the pinion 25 will preferably ba made by milling the teeth 26 and 27, then lathe turning the lateral faces 28 and the lateral faces 20 to a thickness corresponding to that of the faces 28, the piece in which the teeth 26 and 27 are milled being initially blanked so that the teeth 26 are truncated as shown in FIG. 4.
  • minute'wheels and pinions such as those described above, and particularly such as the assembly 24, of simplified construction, drive the cannon-pinion and the hour-wheel under conditions corresponding to conventional conditions.
  • an hourwheel with a conventional toothing such as wheel I5
  • wheel I5 meshes perfectly with them.
  • the star 29 will have a slightly smaller diameter than the wheel 15. Moreover, it will have only one-third as many teeth.
  • a mechanical watch movement comprising:
  • a minute-wheel pinion having a plurality of teeth each having a lateral face portion in the form of a cylinderical arc coaxial with said minute-wheel pinion, at least some of said teeth having a further substantially pointed portion which extends from and beyond said arcuate face portion;
  • toothed minute-wheel having a thickness which is less than the thickness of said minute-wheel pinion and fixed to said arcuate lateral face portions of said minute-wheel pinion;
  • said minutewheel is situated on the outer face of a baseplate of the movement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gears, Cams (AREA)
  • Electromechanical Clocks (AREA)
  • Retarders (AREA)
US465077A 1973-05-11 1974-04-29 Mechanical watch movement Expired - Lifetime US3888077A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH673273A CH582376B5 (zh) 1973-05-11 1973-05-11

Publications (1)

Publication Number Publication Date
US3888077A true US3888077A (en) 1975-06-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US465077A Expired - Lifetime US3888077A (en) 1973-05-11 1974-04-29 Mechanical watch movement

Country Status (4)

Country Link
US (1) US3888077A (zh)
JP (1) JPS5711029B2 (zh)
CH (2) CH673273A4 (zh)
DE (1) DE2422055C2 (zh)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991556A (en) * 1974-06-12 1976-11-16 Societe Jaz S.A. Clock or watch movement
US4250576A (en) * 1977-07-15 1981-02-10 Quarz-Zeit Ag Electric clock
EP1046964A1 (en) * 1998-01-07 2000-10-25 Seiko Instruments Inc. Transmission gear, method of manufacturing the same, and automatically wound gear train structure
US9999555B2 (en) 2013-02-27 2018-06-19 Ferno-Washington, Inc. Powered roll-in cots having wheel alignment mechanisms
US10736798B2 (en) 2010-01-13 2020-08-11 Ferno-Washington, Inc. Powered roll-in cots
US10925781B2 (en) 2014-04-04 2021-02-23 Ferno-Washington, Inc. Methods and systems for automatically articulating cots

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US338959A (en) * 1886-03-30 Geoege e
US2589052A (en) * 1944-01-05 1952-03-11 Chiffelle Eugene Alexandre Watch winding and setting mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US338959A (en) * 1886-03-30 Geoege e
US2589052A (en) * 1944-01-05 1952-03-11 Chiffelle Eugene Alexandre Watch winding and setting mechanism

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991556A (en) * 1974-06-12 1976-11-16 Societe Jaz S.A. Clock or watch movement
US4250576A (en) * 1977-07-15 1981-02-10 Quarz-Zeit Ag Electric clock
EP1046964A1 (en) * 1998-01-07 2000-10-25 Seiko Instruments Inc. Transmission gear, method of manufacturing the same, and automatically wound gear train structure
EP1046964A4 (en) * 1998-01-07 2001-04-04 Seiko Instr Inc TRANSMISSION GEAR, ITS MANUFACTURING METHOD AND AUTOMATIC SELF-WINDING GEARBOX STRUCTURE
US6422348B1 (en) 1998-01-07 2002-07-23 Seiko Instruments Inc. Transmission wheel, method for manufacturing transmission wheel and self-winding wheel train structure having transmission wheel
US10736798B2 (en) 2010-01-13 2020-08-11 Ferno-Washington, Inc. Powered roll-in cots
US11376171B2 (en) 2010-01-13 2022-07-05 Ferno-Washington, Inc. Powered roll-in cots
US9999555B2 (en) 2013-02-27 2018-06-19 Ferno-Washington, Inc. Powered roll-in cots having wheel alignment mechanisms
US10391006B2 (en) 2013-02-27 2019-08-27 Ferno-Washington, Inc. Powered roll-in cots having wheel alignment mechanisms
US10925781B2 (en) 2014-04-04 2021-02-23 Ferno-Washington, Inc. Methods and systems for automatically articulating cots

Also Published As

Publication number Publication date
DE2422055A1 (de) 1974-11-28
CH582376B5 (zh) 1976-11-30
CH673273A4 (zh) 1976-06-30
JPS5054358A (zh) 1975-05-14
DE2422055C2 (de) 1983-07-07
JPS5711029B2 (zh) 1982-03-02

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