US3844108A - Mechanical watch movement - Google Patents

Mechanical watch movement Download PDF

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Publication number
US3844108A
US3844108A US00465664A US46566474A US3844108A US 3844108 A US3844108 A US 3844108A US 00465664 A US00465664 A US 00465664A US 46566474 A US46566474 A US 46566474A US 3844108 A US3844108 A US 3844108A
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United States
Prior art keywords
wheel
plate
bridge
click
ratchet
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Expired - Lifetime
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US00465664A
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English (en)
Inventor
P 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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Application filed by Ebauches Bettlach SA filed Critical Ebauches Bettlach SA
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Publication of US3844108A publication Critical patent/US3844108A/en
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Expired - Lifetime legal-status Critical Current

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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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/02—Devices allowing the motion of a rotatable part in only one direction
    • G04B11/022—Devices allowing the motion of a rotatable part in only one direction with a ratchet which makes contact with the rotating member by means of teeth
    • G04B11/024—Devices allowing the motion of a rotatable part in only one direction with a ratchet which makes contact with the rotating member by means of teeth rotatable about a fixed axis by means of spring action

Definitions

  • This invention relates to a mechanical watchmovement comprising a mainspring fitted in a barreldrum rotating around a barrel-arbor, an inner member to which the mainspring is hooked, a ratchet-wheel integral in rotation with the inner member, a base-plate and a bridge supporting the two ends of the barrelarbor, severalpillars connecting the base-plate to the bridge and fixing them with respect to one another, a click for retaining'the ratchebwheel, and a resilient element acting upon the click.
  • Watch movements of this type are known to be generally of a simplified construction and are so designed as to make possible mass-production at a minimum cost price.
  • both the base-plate and the bridges of pillar movements are for the most part blanked flat plates having no recesses in their thickness.
  • the retainingclick is generally mounted on a pin fixed in the inner face of the bridge or the base-plate, and the resilient element which acts upon it is a spring wire, likewise fastened at one end to the inner face of the bridge of the base-plate.
  • Certain timers equipped with a clockworkmovement in which the mainspring is connected to a motor which is started periodically in order to keep the movement running continuously, comprise a barrel with a drum having a toothing connected by a geartrain to the winding motor, on the one hand, and a wolf-tooth toothing cooperating with a retaining-click, on the other hand, so that the drum acts as the ratchetwheel.
  • the barrel-arbor carries the first wheel which drives the gear-train of the movement.
  • the retaining-click pivots around a cylindrical bearing surface of one of the pillars, and the resilient element which keeps it engaged with the wolf-tooth toothing is a spring wire coiled around the aforementioned cylindrical bearing surface.
  • This arrangement which is suitable for timers, could not be used to advantage in a watch because of the difficulties which would be encountered in fitting the click and the coil-spring. It would not represent any simplification as compared with the arrangements used heretofore.
  • the object of the present invention to provide a simplified mechanical watch movement in which the device which prevents the ratchet-wheel from turning in the direction which allows the mainspring to unwind is composed of a minimum number of parts capable of being manufactured and assembled efficiently, and in which the aforementioned device performs its assigned functions reliably and with a minimum of friction.
  • a mechanical watch movement of the type initially described wherein the ratchet-wheel extends between the bridge and the barrel-drum, the click is a blanked flat plate having an arcuate indentation in one of its edges, the said indentation is engaged on a cylindrical bearing surface of one of the pillars at the level of the ratchet-wheel, and the said resilient element is an arm blanked in a plate integral with the frame of the movement.
  • FIG. 1 is a top plan view of a preferred embodiment
  • FIG. 2 is a section taken on the line llll of FIG. 1.
  • the watch movement shown in the drawing is designed so that it can be manufactured by the fastest and most efficient possible means. To this end, all the elements of this movement have been simplified, they have been reduced in number, and their form has been so chosen as to facilitate both their manufacture and their assembly.
  • the movement comprises a base-plate l, a barrel-and wheel-train bridge 2, a balance-cock 3, and between these frame elements, the members of the wheel-train, viz., a barrel 4 (FIG. 2), an eccentric center-wheel 5, a third wheel 6, a central fourth wheel 7, an escape wheel 8, a pallet 9, and an oscillating system with balance and balance-spring 10.
  • the dial-train will be described further on.
  • the winding and setting mechanism comprises a sliding crown-wheel 11 which rests on the balance-cock 3, placed a little lower than the bridge 2, a stem 12 machined with a pinion toothing l3, and a setting-wheel (not shown in FIG. l) which pivots on the lower face of the base-plate l.
  • the stem is held in place by a resilient plate 14 which partly extends under the balancecock 3 and which is fastened around a cylindrical bearing surface of one of the pillars supporting the balancecock 3.
  • the bridge 2 is fastened to the base-plate 1 by three pillars 16a, 16b, 160 which are riveted t0 the base-plate l and to the bridge 2, as can be seen in FIG. 2.
  • the cylindrical ends of the pillars are engages in circular openings cut out of the base-plate l and the bridge 2 and are then turned back laterally over the outer surfaces of those frame elements, thus ensuring the rigid and permanent attachment of those elements tov the frame of the movement described.
  • the base-plate 1 takes the form of a square with rounded corners. it is blanked according to the outline shown in the drawing and has in one of its straight sides a positioning notch 17 serving for various machining operations.
  • the base-plate 1 is also lathe-turned so as to have projecting edges 18 which are formed out of part of its thickness and which serve to support the movement in the watch-case or on the fitting-ring.
  • Holes 19 and 20 serve for the engagement and fastening of the dial-feet. It will be noted that they are situated in a region of the plate which is completely outside the central circular zone occupied by the parts of the movement and covered by bridges 2 and 3. This arrangement of the base-plate in itself makes possible a simplification of manufacture.
  • part-holder For in order to fasten the base-plate on the lathe used to form the peripheral grooves of the edges 18, part-holder can be used which are adjusted to the distance between the parallel straight sides of the base-plate, no matter what the diameter of the rounding at the corners of the baseplate may be. These same part-holders may therefore be used for base-plates where the diameter of the rounding corresponds to calibers of various sizes.
  • the rounded corners of the base-plate 1 may be blanked and turned to dimensions corresponding to a 13" or a 12" caliber. The same wheel-trains and the same bridges will be used for both these calibers.
  • a square hole 21 in bridge 2 corresponds to two square holes in the base-plate l, and these holes serve to fasten apartial stem cock on which the crown-wheel ll pivots.
  • a similar partial stem cock 22 is held in place between a notch in the balance-cock 3 and a rectangular hole in the base-plate lin the vicinity of the straight side turned toward 3 oclock.
  • the dial-train presents a particularity which-greatly simplifies its manufacture.
  • the pillar 16a which connects the base-plate l to the bridge 2, the central fourth wheel 7 with its spindle passing through a pipe 23 fastened to the center of the base-plate 1, and the barreldrum 4.
  • the latter has a toothing 24 which is engaged with the pinion of the eccentric center-wheel 5.
  • the drum 4 is further provided with a tubular central hub extending inside the drum in the form of a cylindrical bushing 25, on the'one hand, and outside the drum into the vicinity of the base-plate l in the form of a sleeve, on the other hand.
  • the outer portion 26 of the sleeve has an annular groove 27, the bottom of which is broken through along a portion of its periphery so as to form a slot 27a.
  • abarrel-arbor 28 fitted freely to the inside dimensions of the hub.
  • the arbor 28 passes through two openings 29 and 30 in the bridge 2and in the base-plate 1, respectively, thus enabling the barrel 4 to pivot.
  • the arbor 28 also has a groove 31 with a trapezoidal profile, in the bottom of which rests one of the arms of a bolt 32, the outer arm of which is engaged in the groove 27.
  • This bolt 32 of a hairpin shape, forms a friction coupling between the arbor 28 and the barrel 4.
  • the arbor 28 fixes the arbor 28 axially.
  • the arbor 28 can thus slide axially and be removed.
  • the bolt 32 is placed on the barrel 4 before the latter is fittedin the movement, and it resiliently presses the arbor 28 against the inner surface of the hub 25, 26.
  • the inner edge of its arm which is in contact with the bottom of the groove 27 has a concave rounding, while the inner edge of the other arm is straight and rests against the arbor 28 through the opening in groove 27.
  • the arbor 28 has a frustoconical head 33 provided with a slot. It can be grasped by this head and extracted from the movement, thus enabling the barrel 4 to be removed laterally for repair or overhaul.
  • a tubular core 34 Engaged on the bushing 25 which extends inside the drum 4 is a tubular core 34. It is provided'with a stophook 35 for the inner end of the mainspring, and a ratchet-wheel 36 is driven onto the upper end of it.
  • the ratchet-wheel 36 acts as a cover for the barrel 4 and extends immediately beneath the bridge 2.
  • the length of the core 34 is very slightly less than that of the bushing 25 which, with the sleeve 26, determines the axial shake of the barrel assembly on arbor 28.
  • the arbor 28 has a square 37 which projects from the outer face of the base-plate 1 in a thinner portion of this frame element.
  • the square 37 serves as a connection element between the arbor 28 and a minute-wheel mounted on the outer face of the base-plate 1.
  • This minute-wheel is composed of a pinion 38 and a toothed disc 39.
  • the pinion 38 is made by blanking from a circular disc with a square center hole adjusted to the dimensions of the square 37.
  • the toothed disc 39 has a center opening adjusted to the dimensions of this imaginary cylindrical surface, and it is driven onto the pinion 38. Since it is thinner than the pinion 38, it leaves a sufficient portion of the thickness of the teeth alongside it to ensure the meshing of the pinion 38 with an hour-wheel 41, as will be'seen in the drawing.
  • the hour-wheel 41 is itself mounted on acannonpinion 40 which pivots on the pipe 23 and meshes with the peripheral toothing of the disc 39.
  • the toothed disc 39 will be engaged with a settingwheel, likewise pivoting on the outer face of the baseplate and cooperating with the member of the setting mechanism.
  • the same constituent elements of the minute-wheel may be used.
  • the pinion 38 rather than being milled with all its teeth truncated, will have a certain number of full teeth regularly distributed around its periphery.
  • the outside diameter of the toothing of the hour-wheel will be slightly less than in the case described above, so that only the full teeth of the minute-wheel pinion mesh with its toothing.
  • the hour-wheel will normally be kept in a fixed position, e.g., by a jumper-spring, and will move by l/l2 of a revolution per hour, driven by one of the full teeth of the minute-wheel pinion.
  • the center opening of the disc 39 will be blanked with notches corresponding to the full teeth of the pinion 38 so that this disc may be driven onto the pinion. Provision might also be made to let the full teeth of the pinion 38 remain only for a portion of their thickness, the disc 39 then having a circular opening driven onto the portions of truncated teeth.
  • This simplified minute-wheel drives the moving parts 40 and 41 under conditions corresponding to conventional conditions. In particular, despite the fact that the teeth of the pinion 38 are truncated for about half of their height, an hour-wheel with a conventional toothing, such as wheel 41, meshes with them perfectly.
  • the arrangement of a click 42 for retaining the ratchet-wheel 36 can be seen in FIG. 1.
  • the click 42 is a blanked flat plate having an indentation 43 in the form of an arc of about 220'? along one of its edges.
  • the plate 42 On the edge of it opposite the indentation 43, the plate 42 has a beak 44 which is slightly inclined with respect to the radial direction determined by the center of the indentation 43 and the end of the beak 44.
  • Two wings, 45 and 46 extend on either side of this beak 44, the wing 46 being limited by a straight edge which comes to rest against the toothing of the ratchet-wheel 36, while the wing 45 extends beyond the edge of the bridge 2.
  • the pillar 16a has a first shoulder 47 which serves to position the bridge 2 with respect to the base-plate l and, starting at the edge of this shoulder 47, a cylindrical bearing surface 48 limited axially by a second shoulder 49. It is on the cylindrical bearing surface 48 that the indentation 43 of the click 42 is engaged, so that the latter is held axially in place between the inner face of the bridge 2 and the shoulder 49.
  • the beak 44 is engaged in the toothing of the ratchet-wheel 36, and normally, the action of the mainspring presses the wing 46 against this same toothing, so that the ratchet-wheel 36 is blocked. However, if pressure is applied to the wing 45 which projects beyond the bridge 2, the beak 44 is disengaged from the toothing of the ratchet-wheel 36, which allows the mainspring to be let down.
  • a hole 51 made in the bridge 2 makes it possible to verify whether the click is in place and whether it is properly resting against the ratchet-wheel.
  • a mechanical watch movement comprising a mainspring fitted in a barrel-drum rotating around a barrel-arbor, an inner member to which the mainspring is hooked, a ratchet-wheel integral in rotation with the inner member, a base-plate and a bridge supporting the two ends of the barrel-arbor, several pillars connecting the base-plate to the bridge and fixing them with respect to one another, a click for retaining the ratchetwheel, and a resilient element acting upon the click, wherein the ratchet-wheel extends between the bridge and the barrel-drum, the click is a blanked flat plate having an arcuate indentation in one of its edges, the said indentation is engaged on a cylindrical bearing surface of one of the pillars at the level of the ratchetwheel, and the said resilient element is an arm blanked in a plate integral with the frame of the movement.
  • the said one of the pillars comprises a shoulder which, together with the bridge, determines the axial position of the said click, the said shoulder being adjacent to the said cylindrical bearing surface on which the said indentation is engaged.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Toys (AREA)
US00465664A 1973-05-11 1974-04-30 Mechanical watch movement Expired - Lifetime US3844108A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH672973A CH582370B5 (de) 1973-05-11 1973-05-11

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US3844108A true US3844108A (en) 1974-10-29

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US00465664A Expired - Lifetime US3844108A (en) 1973-05-11 1974-04-30 Mechanical watch movement

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US (1) US3844108A (de)
JP (1) JPS579032B2 (de)
CH (2) CH582370B5 (de)
DE (1) DE2422051C2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130283615A1 (en) * 2012-04-25 2013-10-31 Eta Sa Manufacture Horlogere Suisse Barrel arbour and mainspring
EP2899193B1 (de) 2008-01-21 2018-03-14 Esteve Química, S.A. Kristalline Form von im Wesentlichen lösungsmittelfreiem Abacavir
EP3285123B1 (de) * 2016-08-15 2021-04-14 Rolex Sa Vorrichtung zum aufziehen eines uhrwerks
US20210302912A1 (en) * 2020-03-31 2021-09-30 Eta Sa Manufacture Horlogère Suisse Stop pawl for horological movement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6874341B2 (ja) * 2016-11-22 2021-05-19 セイコーエプソン株式会社 時計用駆動機構、機械式時計およびゼンマイの操作方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758489A (en) * 1950-05-15 1956-08-14 Bulova Watch Co Inc Automatic winding mechanism for wrist watches

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH354389A (fr) * 1958-05-08 1961-05-15 Ebosa Sa Montre à encliquetage
DE1984988U (de) * 1968-01-20 1968-05-02 Foerster Bernhard Fa Federhaus fuer uhrwerke.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758489A (en) * 1950-05-15 1956-08-14 Bulova Watch Co Inc Automatic winding mechanism for wrist watches

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2899193B1 (de) 2008-01-21 2018-03-14 Esteve Química, S.A. Kristalline Form von im Wesentlichen lösungsmittelfreiem Abacavir
US20130283615A1 (en) * 2012-04-25 2013-10-31 Eta Sa Manufacture Horlogere Suisse Barrel arbour and mainspring
US9317013B2 (en) * 2012-04-25 2016-04-19 Eta Sa Manufacture Horlogère Suisse Method of producing drive element for a timepiece barrel including a barrel arbor and mainspring
RU2609397C2 (ru) * 2012-04-25 2017-02-01 Эта Са Мануфактюр Орложэр Сюис Вал барабана и ходовая пружина
EP3285123B1 (de) * 2016-08-15 2021-04-14 Rolex Sa Vorrichtung zum aufziehen eines uhrwerks
US20210302912A1 (en) * 2020-03-31 2021-09-30 Eta Sa Manufacture Horlogère Suisse Stop pawl for horological movement
US11789406B2 (en) * 2020-03-31 2023-10-17 Eta Sa Manufacture Horlogère Suisse Stop pawl for horological movement

Also Published As

Publication number Publication date
CH672973A4 (de) 1976-05-14
CH582370B5 (de) 1976-11-30
DE2422051A1 (de) 1974-11-28
JPS5054355A (de) 1975-05-14
DE2422051C2 (de) 1983-07-28
JPS579032B2 (de) 1982-02-19

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