US3703838A - An improved pawl - Google Patents

An improved pawl Download PDF

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Publication number
US3703838A
US3703838A US110958A US3703838DA US3703838A US 3703838 A US3703838 A US 3703838A US 110958 A US110958 A US 110958A US 3703838D A US3703838D A US 3703838DA US 3703838 A US3703838 A US 3703838A
Authority
US
United States
Prior art keywords
ratchet wheel
jewel
fingers
arm
wheel
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
US110958A
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English (en)
Inventor
Yuki Tsuruishi
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 US3703838A publication Critical patent/US3703838A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/02—Devices allowing the motion of a rotatable part in only one direction
    • G04B11/04—Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets
    • Y10T74/2141—Sliding pawls

Definitions

  • Electric watches using a tuning fork or a counter are particularly subject to mechanical shock because the rigidity of the drive assembly is low. Special protection is therefore necessary against even small shocks where such mechanisms are involved.
  • Yet another object is to provide firm support for the pallet jewel in a direction transverse to the plane of the ratchet wheel which the pawl engages.
  • FIG. 1 is a perspective view of a conventional ratchet wheel and pallet jewel
  • FIG. 2 is a plan view of a ratchet wheel device in accordance with the invention.
  • FIG. 3 is a perspective view of a pallet jewel and support arm on which are mounted fingers for preventing disengagement between the jewel and the wheel.
  • FIG. 1 shows a ratchet wheel device of conventional construction in which an arm 3 holds a pallet jewel 2 in contact with a ratchet wheel 1.
  • the thickness of the jewel 2 in the direction transverse to the plane of the ratchet wheel. is great enough so that a small shock in the direction of the axis of the wheel will not cause the arm 3 to flex enough to permit the jewel to rise completely above the wheel or to fall completely below the wheel. If the arm 3 flexed enough to allow the jewel to move either completely above or completely below the wheel, then the arm, due to the way in which it is biased, would move the jewel toward the axis of the wheel and the timepiece would stop.
  • FIG. 1 shows a ratchet wheel device of conventional construction in which an arm 3 holds a pallet jewel 2 in contact with a ratchet wheel 1.
  • the thickness of the jewel 2 in the direction transverse to the plane of the ratchet wheel. is great enough so that a small shock in the direction of the axis of the wheel will not cause the arm
  • the support arm 3 is supplied with at least one finger 4.
  • the finger 4 is mounted on the arm 3 so that there is clearance between the finger 4 and the ratchet wheel 1.
  • the finger 4 does not drag upon the ratchet wheel 1.
  • the finger 4 would engage with the ratchet wheel 1 and prevent the excursion of the jewel from being great enough to disengage the jewel from the wheel.
  • FIG. 3 shows a pair of fingers 4A and 4B mounted on the arm 3, where the fingers 4A. and 4B constitute extensions of the arm 3.
  • the fingers 4A and 43 may take a variety of forms.
  • the fingers 4A and 4B' can be mounted on the arm 3 by welding, by soldering, or by other suitable means.
  • the spacing between the fingers 4A and 4B issuch that disengagement of the jewel from the ratchet wheel is prevented regardless of the direction or magnitude of the mechanical shock. After mechanical shock the arm 3 returns to the normal position in which neither of the fingers makes contact with the ratchet wheel.
  • An improved pawl for driving a ratchet wheel comprising a pallet jewel for engaging said ratchet wheel, the thickness of said pallet jewel in the direction parallel to the axis of said ratched wheel being greater than that of said ratchet wheel, a flexible arm supporting said pallet jewel and urging said pallet jewel against said ratchet wheel, and two fingers extending from said arm, each of said fingers flanking with clearance one face of said ratchet wheel, said fingers thereby serving to prevent disengagement of said pallet jewel from said ratchet wheel by accidental shock in a direction transverse to the plane of said ratchet wheel and to hold said jewel firmly in place in said arm.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adornments (AREA)
  • Transmission Devices (AREA)
  • Electromechanical Clocks (AREA)
US110958A 1970-02-02 1971-01-29 An improved pawl Expired - Lifetime US3703838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP857170 1970-02-02

Publications (1)

Publication Number Publication Date
US3703838A true US3703838A (en) 1972-11-28

Family

ID=11696723

Family Applications (1)

Application Number Title Priority Date Filing Date
US110958A Expired - Lifetime US3703838A (en) 1970-02-02 1971-01-29 An improved pawl

Country Status (4)

Country Link
US (1) US3703838A (enrdf_load_stackoverflow)
CH (2) CH570643B5 (enrdf_load_stackoverflow)
DE (1) DE2103819A1 (enrdf_load_stackoverflow)
GB (1) GB1300181A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196690A (en) * 1978-07-21 1980-04-08 Carlo Alinari Device for indicating the maximum reading of a measuring instrument

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029636A (en) * 1932-10-13 1936-02-04 Western Union Telegraph Co Selective signaling device
GB648555A (en) * 1947-09-13 1951-01-10 Philips Nv Improvements in and relating to click mechanisms
US2868026A (en) * 1957-08-22 1959-01-13 Mallory & Co Inc P R Intermittent driving mechanism
FR1400990A (fr) * 1964-07-16 1965-05-28 Omega Brandt & Freres Sa Louis Transmission de mouvement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029636A (en) * 1932-10-13 1936-02-04 Western Union Telegraph Co Selective signaling device
GB648555A (en) * 1947-09-13 1951-01-10 Philips Nv Improvements in and relating to click mechanisms
US2868026A (en) * 1957-08-22 1959-01-13 Mallory & Co Inc P R Intermittent driving mechanism
FR1400990A (fr) * 1964-07-16 1965-05-28 Omega Brandt & Freres Sa Louis Transmission de mouvement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196690A (en) * 1978-07-21 1980-04-08 Carlo Alinari Device for indicating the maximum reading of a measuring instrument

Also Published As

Publication number Publication date
CH570643B5 (enrdf_load_stackoverflow) 1975-12-15
DE2103819B2 (enrdf_load_stackoverflow) 1975-08-21
DE2103819A1 (de) 1971-08-12
CH143271A4 (enrdf_load_stackoverflow) 1975-07-15
GB1300181A (en) 1972-12-20

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