US3623316A - Clubtooth lever escapement - Google Patents

Clubtooth lever escapement Download PDF

Info

Publication number
US3623316A
US3623316A US25717A US3623316DA US3623316A US 3623316 A US3623316 A US 3623316A US 25717 A US25717 A US 25717A US 3623316D A US3623316D A US 3623316DA US 3623316 A US3623316 A US 3623316A
Authority
US
United States
Prior art keywords
escapement
anchor
escape wheel
length
clubtooth
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
US25717A
Other languages
English (en)
Inventor
Kenji Abe
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.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
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 Suwa Seikosha KK filed Critical Suwa Seikosha KK
Application granted granted Critical
Publication of US3623316A publication Critical patent/US3623316A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • G04B15/00—Escapements
    • G04B15/06—Free escapements
    • G04B15/08—Lever escapements
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/04—Wing frames not characterised by the manner of movement
    • E06B3/06—Single frames
    • E06B3/08—Constructions depending on the use of specified materials

Definitions

  • the present invention relates toan improved clubtooth lever escapement for a timepiece, and more particularly to the transmission efficiency of the escapement.
  • the length of the respective impulse faces of the escape wheel tooth, the entry pallet jewel and exit pallet jewel are determined in accordance with a fixed relationship to increase the transmission efficiency of the whole escapement.
  • FIG. 1 is a plan view of a conventional clubtooth lever escapement
  • FIG. 2 shows the operating relationship between the driving part (hereinafter referred to as an escape wheel portion) and the driven part (hereinafter referred to as an anchor portion) when they rotate in one direction;
  • FIGS. 3 and 4 show the operating relationship between an escape wheel tooth and an entry pallet jewel
  • FIG. 5 shows the operating relationship between an escape wheel portion and an anchor portion when the latter rotates in the opposite direction
  • FIG. 6 is a graph showing the relationship between the 'mainspring torque and the amplitude of the balance in a conventional escapement and also in an escapement according to the present invention.
  • FIG. 7 is a graph showing the relationship between the frequency and the transmission efiiciency in a conventional escapement and also in an escapement according to the present invention.
  • a clubtooth lever escapement is composed of an escape wheel 1, an anchor 2 and a roller table 3 of a balance.
  • the roller table 3 is coaxially mounted on a balance staflf 13.
  • a roller jewel 12 strikes against a horn 11 of the anchor. This permits an entry pallet jewel 7 to leave its lock face 8.
  • the escape wheel 1 rotates in the direction of the arrow 14
  • the anchor 2 receives rotation torque in the direction of the arrow 15 and transmits the energy through the horn 11 of the anchor and the roller jewel 12 to the balance.
  • An exit pallet jewel 7 then locks an escape wheel tooth against rotation and at the same time the anchor 2 is pressed against a banking pin '10. While the balance rotates in the opposite direction to the arrow 1l6, said exit pallet jewel takes the same actions as said entry pallet jewel.
  • the escape wheel tooth is provided with a lock face 5 and an impulse face 6.
  • the entry pallet jewel 7 of the anchor is provided with a lock face 8 and an impulse face 9, while the exit pallet jewel 7 is provided with a lock face 8 and an impulse 9. Therefore, the energy transmission from the escape wheel 7 to the anchor 2 is accomplished at the impulse faces thereof.
  • the purpose of the present invention is to provide extremely high accuracy to a time piece by maintaining the relationship between the impulse face of the escape wheel tooth and that of the pallet jewel so as to obtain a high efliciency of the escapement.
  • the high transmission efficiency of the whole escapement can be obtained by improving the efficiency of the entry pallet and the exit pallet separately. In other words, if either of the above-mentioned relations is satisfied, the efficiency can also be improved to some extent. But it is preferable to design an escapement so as to satisfy both relations above.
  • the escape wheel portion which rotates on an axis of O in the direction of the arrow rotates the anchor portion on an axis of 0 by the force F passing through the point of contact C.
  • F represents the force without friction.
  • on represents a friction angle.
  • P and P is the length of a perpendicular line drawn on the extension line of the force F from O and 0 respectively.
  • P and P is also the length of a perpendicular line drawn on the extension line of the force F.
  • a and B represent the distance between 0, and C, or between O and C, respectively.
  • L represents the length between 0- and 0 a is CO O 0 is O CO and [3 is (18OCO O
  • A is an angle formed with a segment of a line 0 C and F. and represent angles in polar coordinates where 0 and 0 are the origin thereof correspondingly.
  • Equation 1 and 2 lead to:
  • FIG. 3 shows the operating relationship in which the impulse face of the entry pallet jewel is lifted by the locking corner 17 of the escape wheel tooth.
  • the marks employed in FIG. 3 mean the same as those in FIG. 2.
  • R is the length between 0 and the locking corner 17 of the escape wheel tooth.
  • R is the length between 0 and the leaving corner 18 of the escape wheel tooth.
  • Act is an angle formed with the segments of lines R and R S is the length between 0 and the locking corner 19 of the anchor.
  • S is the length between 0 and the leaving corner 20 of the anchor.
  • Afr is an angle formed with the segments of lines S and S
  • FIG. 5 shows the operating relationship in which the escape wheel tooth is impelled against the exit pallet jewel.
  • the total transmission efliciency 1 of the exit pallet side can be calculated in approximately the same manner as calculated in the case of the entry pallet side, by employing the following Therefore the transmission efficiency 1 between the escape wheel and the anchor is given:
  • L /S +S -2S S cos A13 is the impulse face length of the entry pallet jewel (length between 19 and 20 in FIG. 3);
  • L /S +S 2S S cos A 6 is the impulse face length of the exit pallet jewel.
  • S S and AB (not shown) of the exit pallet jewel correspond to S S and AB of the entry pallet jewel respectively.
  • the Width of the pallet jewel must be made small or with the conventional pallet jewel the width of the escape Wheel tooth must be made fairly large. Therefore if the conventional escape wheel and the anchor are employed with only a slight change it requires the following ratios i.e. L /L and L /L less than 1.0 respectively. Even if the width is less than 1.0 the transmission efiiciency can be increased more than 20 to 30% compared with that of the conventional escapement. It is also economical since great change in design or structure is not required for the conventional watch parts.
  • Minimization of the pallet jewel in width makes it difiicult to cut or polish rubies which are used as the materials for pallet jewels.
  • the length of the impulse face of the escape wheel tooth is fairly shorter than that of the anchor.
  • the improvement of the escapement efiiciency can be performed by keeping the relations among L L and L satisfactorily.
  • the conventional escapement has L /L -0.5 and L /L -0.5
  • the escapement according to the invention has L /L -0.9 and L /L -0.9.
  • FIG. 6 shows the relationship between the amplitude and the torque in the horizontal and vertical position in the conventional escapement and the escapement according to the invention.
  • the ratio of the mainspring torque to the same amplitude of 210 between the conventional escapement having the torque of 120 gem. and the escapement having the torque of 100 gcrn. according to the invention is 120/ 100:1.2. Thatis, the transmission efiiciency in the escapement according to the invention can be increased by 20%.
  • the transmission efiiciency of the train wheels is generally 70% and Q value of the balance is approximately 300
  • the transmission efliciency of the escapement can be calculated from Table I. Namely, the transmission efliciency of the conventional escapement is 31%, while that of the escapement according to the invention is 37%. In other words, the transmission efliciency of the escapement according to the invention can be increased by about 1.2 times as that of the conventional escapement.
  • FIG. 7 shows the transmission efficiency of the timepieces having the different frequency.
  • the transmission efficiency of the escapement according to the invention is far higher than that of the conventional escapement, making it possible to decrease the isochronism error caused by a hairspring, positional error and escapement error and thus insuring the production of timepieces with extremely high frequency.
  • a clubtooth lever escapement with high transmission efficiency comprising an escape wheel having a plurality of teeth, each of said teeth having an impulse face; and an anchor having an entry pallet jewel and an exit pallet jewel, each of said entry and exit pallet jewels being formed with an impulse face for cooperative engagement with said escape wheel teeth for the transmission of energy from said escape wheel to said anchor, and wherein 1.0 L /L 20.85, where L is the length of the impulse face of the escape wheel teeth, and L is the length of the impulse face of the entry pallet jewel of the anchor.
  • a clubtooth lever escapement with high transmission efliciency comprising an escape wheel having a plurality of teeth, each of said teeth having an impulse face; and an anchor having an entry pallet jewel and an exit pallet jewel, each of said entry and exit pallet jewels being formed with an impulse face for cooperative engagement with said escape wheel teeth for the transmission of energy from said escape wheel to said anchor, and wherein 1.0 L /L 20.85, where L is the length of the impulse face of the escape wheel teeth and L is the length of the impulse face of the exit pallet jewel of the anchor.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wing Frames And Configurations (AREA)
  • Vehicle Waterproofing, Decoration, And Sanitation Devices (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Refrigerator Housings (AREA)
  • Adornments (AREA)
US25717A 1969-04-16 1970-04-06 Clubtooth lever escapement Expired - Lifetime US3623316A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2897269 1969-04-16
DE7146101 1971-12-07

Publications (1)

Publication Number Publication Date
US3623316A true US3623316A (en) 1971-11-30

Family

ID=25946837

Family Applications (1)

Application Number Title Priority Date Filing Date
US25717A Expired - Lifetime US3623316A (en) 1969-04-16 1970-04-06 Clubtooth lever escapement

Country Status (7)

Country Link
US (1) US3623316A (xx)
BE (1) BE792417A (xx)
CH (2) CH558870A4 (xx)
FR (1) FR2162414B1 (xx)
GB (1) GB1417417A (xx)
IT (1) IT1018051B (xx)
NL (1) NL7216518A (xx)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3024555A1 (de) * 1980-06-28 1982-01-21 Dynamit Nobel Ag, 5210 Troisdorf Schiebefenster
GB2153419B (en) * 1984-01-25 1988-06-29 Bkl Extrusions Ltd Window or door frame members
GB2169336B (en) * 1985-01-05 1988-05-11 Regency Plastics Limited Window
GB2245924B (en) * 1990-07-11 1993-12-15 Scholes Ernest M H Extruded section for window or door frame
GB2284003A (en) * 1993-11-03 1995-05-24 Fios Window Systems Ltd Doors

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1542949A (fr) * 1966-12-24 1968-10-18 Châssis, en particulier pour fenêtre
FR1574316A (xx) * 1968-07-08 1969-07-11

Also Published As

Publication number Publication date
IT1018051B (it) 1977-09-30
NL7216518A (xx) 1973-06-12
FR2162414A1 (xx) 1973-07-20
FR2162414B1 (xx) 1974-08-02
CH558870A4 (fr) 1973-02-15
GB1417417A (en) 1975-12-10
CH558870A (de) 1975-02-14
BE792417A (fr) 1973-03-30

Similar Documents

Publication Publication Date Title
US20190243308A1 (en) Rotating resonator with flexure bearing maintained by a detached lever escapement
US8500323B2 (en) Timepiece including a high frequency mechanical movement
US8480293B2 (en) Timepiece
US3623316A (en) Clubtooth lever escapement
US3538705A (en) Escapement
US3628325A (en) Self-winding watch
US3628327A (en) Clubtooth lever escapement
US2669089A (en) Anchor escapement
US3704582A (en) Indexing mechanism for horological instrument
US3818689A (en) Digital display mechanism for a time-keeper
US11846913B2 (en) Escapement mechanism with locking anchor and timepiece provided with such an escapement mechanism
US2765679A (en) Unidirectional driving gear
US3670493A (en) Indexing mechanism for electric/electronic timepieces
US3901018A (en) Timepiece
US3685282A (en) Watch escapement mechanism
US3576100A (en) Date-watch
US2728187A (en) Watch with indirectly driven minute hand
US3312053A (en) Step by step drvie mechanism for timepiece
US20190332056A1 (en) Timepiece regulating mechanism with articulated resonators
US3713287A (en) Calendar-watch
US3608305A (en) Coordinated combined releasable day and date jumper mechanism for calendar timepieces
US3053041A (en) Vibration-resistant escapements
US20230418225A1 (en) Horological movement comprising a chronograph mechanism
US3603076A (en) Timepiece comprising an optical means for indicating the beat of the seconds
US2725716A (en) Cylinder escapement for watchmaking parts