US3747325A - Pivoting device for a horology movement including a synthetic bearing - Google Patents

Pivoting device for a horology movement including a synthetic bearing Download PDF

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Publication number
US3747325A
US3747325A US00294510A US3747325DA US3747325A US 3747325 A US3747325 A US 3747325A US 00294510 A US00294510 A US 00294510A US 3747325D A US3747325D A US 3747325DA US 3747325 A US3747325 A US 3747325A
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United States
Prior art keywords
bed
pivot
frustrum
bearing
cone
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Expired - Lifetime
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US00294510A
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English (en)
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J Schneider
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Tissot SA
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Tissot 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/02—Shock-damping bearings
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • G04B31/016—Plastic bearings

Definitions

  • ABSTRACT A pivoting device for a wheel-and-pinion used in bowlogy including an elastically deformable, synthetic bearing.
  • a pivot point penetrates into and presses against the bottom of a bed in the bearing to limit the axial clearance of the wheel-and-pinion.
  • the lateral surface of the bed includes two frustrum-of-a-cone surfaces that are coaxial and of different angles and that fit together along a circular edge.
  • the lateral surface of the pivot includes a frustrum-of-a-cone surface that extends on either side of the circular edge so that the free annular space between the lateralsurfaces of the pivot and the bed is a minimum width at the top of the edge.
  • pivoting devices are known in which part of the device is made of plastic substances that may elastically deform so as to soften the impacts.
  • the bearing is provided with a bed of a plastic material and is fastened to that structural component to insure wheel-and-pinion pivoting. Then, the pivot is generally rigidly connected to the cated above.
  • the bearing is provided with, a bed ,of which the lateral wall is bounded by an inner collar, so that the point of the pivot will enter the bed beyond said collar.
  • such constructions make use of metallic parts/One cannotconceive of constructing them in a plastic substance.
  • Pivoting devices are also known in which a plastic pivot of cylindral-conical shape enters-a bed which is bounded by an inner collar that guides the pivot lateral side. Thepivot is fixed whereas the bearing is fastened to the arbor of the wheel-and-pinion. In this case, however, the axial stop is achieved by shoulders that are provided around the pivot and in the outer lateral side of the wheel-and-pinion arbor.
  • the purpose of the present invention is to achieve a pivoting device for a horology wheel-and-pinion in which-the bearing is made of a synthetic substance which may elastically deform so as to dampen impact and in which the drawback mentioned above is eliminated due to an arrangement that also allows a simplification of the wheel-and-pinion manufacture.
  • the pivot comprises a synthetic bearing that will elastically deform and has a bed into which penetrates a pivot with the point of the pivot pressing against the bottom of the bed in order to limit the axial clearance of the wheel-and-pinion.
  • the lateral surface of the bed comprises two frustrum-of-a-cone surfaces that are coaxial and that are of different angles, fitting together along a circular edge.
  • the lateral surface of the pivot comprises a frustrum-of-a-cone surface that extends on either side of said edge, the free annular space between said lateral surfaces being of minimum width at the height of said edge.
  • frustrum-ofa-cone surface also encompasses the particular case where the apex of said surface lies at infinity, that is, for the case of a right cylindrical surface segment.
  • FIG. 1 is a section in diagrammatic form showing the essential characteristics of the pivoting device described below.
  • FIGS. 2 and 3 are axial sections of two horology balances provided with pivoting devices according to two different forms of embodiments of the invention.
  • organ 1 is ametal pivoting capsule made by profile-turning.
  • This part may be a fixed part which is force-fitted into an opening of a structural element of a horology movement or it may be a movable part which is fastened to the arbor of a rotational organ of that movement;
  • Organ 2 which constitutes the bearing, either is a movable piece or a fixed piece. It may be seen that bearing 2, which may be achieved by synthetic injection, is provided on its side facing pivot 1 with bed 3.
  • the lateral surface of bed 3 which surface is a revolution about its axis, comprises a cylindrical part 4 bounded'by a plane base 5, forming the bottom of the bed, and by a frustrum-of-a-cone part 6 that forms its entry stretches to a frontal surface of the hearing.
  • the two coaxial frustrum-of-a-cone surfaces fit together along a circular edge 7.
  • Capsule 1 comprises a pivot 8 the shape of which is slightly of a frustrum-of-a-cone and the height of which is larger than that of cylindrical surface 4 which makes up the bottom of bed 3. Beyond pivot 8, there is a reinforcing zone 9 which is also in the shape of a frustrumof-a-cone but of a larger opening. Reinforcing zone 9 stretches to the collar 10 which is of circular form and through capsule 1 fastens to its supporting organ.
  • the bottom 5 of bed 3 extends to within a very small distance (a few hundredths of a mm) of side 11 of the bearing, so that these two surfaces bound a thin veil 12 that makes up the bottom substance of bed 3.
  • a metallic part 13 with a plane side will be placed against surface 11 and thus any plastic deformation of veil 12 will be suppressed when the point of pivot 8 does press against this latter part of bearing 2.
  • the device as described and specified provides the following advantage.
  • the annular space between pivot 8 and the inner surfaces of bed 3 is of minimum width at the height of edge 7, so that even if perfect coaxial alignment between pivot l and bearing 2 is not realized, that is, even if one of those axes should be oblique with respect to the other, the part of pivot 8 whichwill touch the flank of bed 3 will be an areaof the lateral surface of pivot 8 that is located at the height of edge 7, and this area will come intocontact with edge 7. In this manner one avoids the pivot edge, having a hard substance, from touching and marring the lateral surface of bed 3.
  • the pivot point does not require the pivot point to be slightly in the shape of a frustrum-of-a-cone or the bottom of the bed to be cylindrical.
  • the pivot point may be cylindrical if that part forming the bottom of the bed is in the shape of a frustrum-of-a-cone with an opening directed inversely to the direction of entry 6.
  • a bed be manufactured having a bot- .tom which is cylindrical and which is emplaced in a bearing obtained by injection.
  • FIGS. 2 and 3 show two embodiments of horology balances which are provided with pivoting devices according to the principle shown in FIG. l.'ln those two forms of embodiments, the pivoting capsules 1 are fixed and attached to components of the structure 14 and 15 which constitute the bottom plate and a horology movement bridge.
  • one of thebearings 2 is molded in one piece with a central part 16 and with the arms of the balance.
  • the central part 16 is provided on its side opposite to bearing 2 with a cylindrical bed 17 into which penetrates an end from a cylindrical arbor component 18.
  • the extreme side of arbor 18 makes up the metallic surface 13 that extends slightly from the bottom of bed 3 of the bearing.
  • arbor l8 penetrates in the same manner into a bed 17 which is fashioned in a part of synthetic substance 20 in the shape of a cap or chape.
  • Synthetic substance 20 comprises the balance roller having a projection 21 constituting the roller pin and an end cylindrical part in which has been fashioned an entry hollow of the guard pin and a bed 3 which is identical with the one in the central bulge of part 16.
  • a collet 22 which accepts the inner end of the balancespring.
  • the arbor component 18 is provided with a semi-flat part 19 in order to allow evacuation of the air from the beds 17 when the balance is being assembled.
  • the two bearings 23 are provided with bed 3 identical to that used in the bearings 2. They are fastened to both ends of a cylindrical arbor component 24 by means of a central part 26 of a balance and by means of roller 27. These two parts are metallic and have been provided with axial reaming which was fitted to the bearings 23 and to arbor 24. They are partly force-fitted to arbor 24 and to the central part of bearings 23 after engaging collet 25 on the central part of arbor 24. 7
  • FIGS. 2 and 3 insure good concentricity for the rim and for the roller pin with respect to the axis of the de vice.
  • the beds 3 and 17 of parts 16 and 20 be coaxial for all the components of the balance, once they have been assembled, to be perfectly concentric.
  • arbors 18 and 24 do not require any other manufacturing operation than cutting to the desired length from a bar ofsuitable diameter.
  • the balance of FIG. 2 requires only grinding of the semi-flat part 19.
  • the two embodiments described above comprise pivoting capsules which are fixed and bearings which are fastened to the movable part
  • the inverse arrangement may also be achieved.
  • the reinforcing zone 9 and point 8 of the capsule 1 may be directly fashioned at the ends of the arbor, with. the bearings which are similar to the bearing 23 beingfixed in beds fashioned in the structural components in such a case.
  • the beds for accepting the hearings will be blind so that the thin film of substance remaining below the bottom of beds 3 will be supported by the metal or by the rigid substance of the component.
  • a pivoting device for a horology wheel-and-pinion comprising a bearing having a bed, of a synthetic, elastically deformable material; and a pivot which penetrates into the bed, the point of which presses against the bottom of the bed in order to limit the axial clearance of the wheel-and-pinion; said bed comprising a first lateral surface having two surfaces, one of which is a frustrum-of-a-cone, the other being a cylinder, both surfaces being coaxial with one another and joined together along a circular edge; said pivot comprising a second lateral surface having a frustrum-of-a-cone surface that extends on either side of said edge, the free of different angles and join together along a circular edge; said pivot comprising a second lateral surface having a frustrum-of-a-cone surface that extends on either side of said edge, the free annular space between said first and second lateral surfaces being of minimum width at the height of said edge.
  • bearing bed comprises an entry bounded by a frustrum-of-acone surface and by a bottom laterally limited by a cylindrical surface.
  • a device wherein the bearing is fastened to the arbor of the horology wheel-andpinion, the latter comprising the balance of a watch movement, and wherein the pivot is made of one piece with a collar and is fastened to a structural component of said movement.
  • a device according to claim 1 wherein the pivot comprises a collar, a reinforcing zone in the shape of i a frustrum-of-a-cone and a point limited by said frustrum-of-a-cone surface of the pivot, the angles sub-' projects from a collar which is made of one single piece with the pivot, said collar being cylindrical in shape and being of a diameter larger than that of the pivot base so that it may be force-fitted into an opening of said structural element.
  • a device wherein the bottom of the bed of the bearing is axially supported by a metallic part which has a planesurface touching the side of the bearing that is opposite to the bed so as to allow only a veil of synthetic substance between the bottom of the bed and that plane side.
  • a device according to claim 9 wherein the bearing is molded in one piece with another part of the wheel-and-pinion.
  • a device comprising a component of an arbor mounted in a cylindrical bed which is fashioned in another part of the wheel-and-pinion.
  • a watch movement balance comprising a metallic arbor; bearings of an elastically deformable synthetic substance, fastened to the two ends of said arbor, each said bearing being provided with a bed of cylindrical-conical shape, said bearings being pivoted between two structural components each provided with a pivoting capsule, each capsule being provided with a pivot penetrating into one of said beds, said pivot being provided with a frustrum-of-a-cone lateral side at its end which extends on either side of the edge which bounds the cylindrical part of the frustrum-of-a-cone part of the bed.
US00294510A 1971-10-08 1972-10-03 Pivoting device for a horology movement including a synthetic bearing Expired - Lifetime US3747325A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1473771 1971-10-08

Publications (1)

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US3747325A true US3747325A (en) 1973-07-24

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US (1) US3747325A (de)
JP (1) JPS5323100B2 (de)
CH (2) CH547519A (de)
DE (1) DE2248515C3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942848A (en) * 1973-04-06 1976-03-09 Seitz S.A. Shock absorbing pivot bearing for rotary watch parts
US20020114225A1 (en) * 2001-02-15 2002-08-22 Konrad Damasko Clockwork
CN103890666A (zh) * 2011-10-24 2014-06-25 劳力士有限公司 用于钟表机芯的振荡器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1927358A1 (de) * 1969-05-29 1970-12-03 Karl Gruttmann Stosssicherndes Kunststofflager,insbesondere fuer Uhren

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1927358A1 (de) * 1969-05-29 1970-12-03 Karl Gruttmann Stosssicherndes Kunststofflager,insbesondere fuer Uhren

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942848A (en) * 1973-04-06 1976-03-09 Seitz S.A. Shock absorbing pivot bearing for rotary watch parts
US20020114225A1 (en) * 2001-02-15 2002-08-22 Konrad Damasko Clockwork
US6755566B2 (en) * 2001-02-15 2004-06-29 Konrad Damasko Clockwork
CN103890666A (zh) * 2011-10-24 2014-06-25 劳力士有限公司 用于钟表机芯的振荡器
US9740170B2 (en) 2011-10-24 2017-08-22 Rolex Sa Oscillator for a clock movement
CN103890666B (zh) * 2011-10-24 2017-10-13 劳力士有限公司 用于钟表机芯的振荡器

Also Published As

Publication number Publication date
CH547519A (de) 1974-03-29
DE2248515C3 (de) 1975-05-15
DE2248515B2 (de) 1974-10-03
DE2248515A1 (de) 1973-04-12
CH1473771A4 (de) 1973-08-15
JPS5323100B2 (de) 1978-07-12
JPS4847360A (de) 1973-07-05

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