US1493125A - Stop watch - Google Patents

Stop watch Download PDF

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Publication number
US1493125A
US1493125A US340639A US34063919A US1493125A US 1493125 A US1493125 A US 1493125A US 340639 A US340639 A US 340639A US 34063919 A US34063919 A US 34063919A US 1493125 A US1493125 A US 1493125A
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US
United States
Prior art keywords
arbor
stop
wheel
cam
bearing
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
US340639A
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English (en)
Inventor
Pastor Thomas
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.)
STERLING WATCH Co Inc
STERLING WATCH COMPANY Inc
Original Assignee
STERLING WATCH Co Inc
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 STERLING WATCH Co Inc filed Critical STERLING WATCH Co Inc
Priority to US340639A priority Critical patent/US1493125A/en
Priority to CH92437D priority patent/CH92437A/de
Priority to GB33193/20A priority patent/GB154220A/en
Application granted granted Critical
Publication of US1493125A publication Critical patent/US1493125A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0866—Special arrangements
    • G04F7/0876—Split-time function, e.g. rattrappante
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0842—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms
    • G04F7/0857—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms with single push-button or actuation member for start-stop and reset
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0866—Special arrangements
    • G04F7/088—Special arrangements with display of fraction of seconds, e.g. foudroyante

Definitions

  • This invention relates to that class of chronometers generally designated as stop watches and has for its object to provide a simple, durable, and eflicient mechanism that can be cheaply manufactured and readily attached to the popular low-priced watch now on the market, so that a stop watch may be sold at a price within the reach of students, sportsmen, factory foremen and inspectors, and all who may desire to time acts or movements to the fraction of a second.
  • This invention makes use of some old and well known principles heretofore utilized in this art to procure the same end, effects a change in relationship of parts to produce a simple, compact, and yet effective train of operative mechanism, and improves certain elements in the train to make a more positive, accurate, and durable movement than has heretofore been effected with so simple and cheaply manufactured a structure.
  • Figure 1 is a view of the face of alowpriced watch equipped with a stop hand.
  • the stop hand is at 12 in the inoperative position.
  • Figure 2 is a view of the back of the watch with the back of the watch case removed. The stop movement is in the inoperative position.
  • Figure 3 is a view of the stop movement similar to that of the preceding figure, but with the actuating cam removed and the L shaped bell-crank lever shown in dotted lines. The stop movement is in operative position.
  • Figure 4 is an enlarged section through the watch from back to front, with the back of the watch case and the watch crystal re moved, showing the central arbor, which carries the stop hand, in operative position.
  • Figure 5 is a section similar to that in the preceding figure showing .the arbor in slightly exaggerated inoperative position.
  • the dial of the ordinary watch comprises hour and minute hands that rotate about the center of the dial.
  • the circumference of the outer edge of the dial is graduated into sixty equal divisions or minutes.
  • the second hand is placed off-center on the dial a separate scale is necessary to indicate the seconds, but it is obvious that if the second hand rotated on the axis of the dial the minute graduations on the circumference of the dial would also indicate the seconds.
  • the supplemental second or stop hand which is to be used to indicate the time interval in seconds, is mounted on an arbor that projects through the center of the dial and rotates over the hour and minute hands between the latter and the watch crystal. Supplemental graduations of the minute divisions into fifths, or any desired fraction, are made to facilitate readings in fractions of seconds. In the inoperative position this stop hand rests at 12.
  • FIG. 2 the watch has been turned over and the back of the watch case removed, and an analysis of the structure of the present invention is now possible.
  • the back plate of the watch movement is shown diagrammatically and is designated by the reference character A. Parts of the watch movement are ordinarily exposed but in order not to divert the attention from the structure of the stop movement the plate A is shown as a solid disc.
  • a push pin 11 On the edge of the watch case, conveniently removed from the stem, is a push pin 11, having a rounded head adapted for actuation by a finger or thumb to start the movement of the stop hand, to stop the movement of the stop hand, and to return the stop hand to the initial position over the 12, successively, by pushing on the pin 11 and withdrawing the pressure, three times.
  • the wheel 1 is mounted to rotate continuously on the axis of the third wheel of the watch movement, which wheel is designated by watchmakers as the seconds wheel or third pinion.
  • the periphery of this wheel is provided with fine teeth, which in manufacture may be impressed by rolling. These teeth are adapted to mesh with the teeth of a small pinion 2 fast on the arbor 15, which carries the stop hand 19, when the stop movement is in operative position.
  • the relative number of teeth on the wheel 1 and the pinion 2 are determined by anyone skilled in the art by consulting proper tables prepared for the purpose.
  • the L-shaped bell-crank lever 3 is mounted to oscillate on a screw stud secured to the back plate A at a point above the wheel 1 and to the left of a geometrical line through the push pin 11 and the center of the watch.
  • a cylindrical aperture In the short arm of the L-shaped bell-crank lever 3 is a cylindrical aperture to provide a bearing for the upper end of the stop-hand arbor 15, and the end of the long arm of the L-shaped bell-crank lever is in contact with the cam 4.
  • the movement of the arbor 15 through the small space sufficient to disengage the teeth of the pinion 2 from the teeth of the pinion 1 is practically in a straight line perpendicular to the tangent at the point of contact between the wheel 1 and the pinion 2, and that this line coincides with the geometrical diameter through the push pin 11.
  • the L-shaped bell-crank lever 3 is the element of the stop movement most elevated above the back plate A and substantially entirely disposed in a central zone on the back plateA.
  • the cam 4 is mounted to rotate on a stud screwed into the back plate A at a point to the left of the geometrical diameter through the push pin 11.
  • the cam 4 is in the form of a circular disc, the circumference of which is intercepted by three concavities the centers of which are 120 degrees from each other, so that the cam 4'consists of three cam surfaces each of which is effective through eighty degrees or two-ninths of the circumference, or in one complete rotation of the cam 4 the surfaces are effective three times, each through two-ninths of one rota tion, and. the concavities are effective as stops three times, each every third of a rota,
  • cam disk 4 is equal to the sum of the bell-crank lever 3 and the stop-resetting lever 12.
  • the stop-resetting lever 12 is mounted on a stud to the right of the line through the center of the back plate and the push pin 11.
  • the stud is screwed into the back plate A and is provided with a suitable screw cap at the proper elevation from the back plate.
  • the stud acts as a pivot for a coil spring 13, one end of which is secure in the back plate and the other end fastened to a pin on the lower side of the lever 12. This spring 13 tends to swing the lever 12 in a clockwise direction toward the arbor 15 and the cam 4.
  • the stop-resetting lever is provided with a thumb 12 adapted for continuous contact with the surfaces of the earn 4, and a finger 12 adapted for intermittent contact with the heart cam 14 which is of usual construction, well known to those skilled in the art.
  • the heart cam 14 is fixed to the arbor .15, which carries the stop hand 19.
  • the stop hand is so positioned on the end of the arbor that when the finger 12 of the stop lever is in contact with the concavity of the heart cam, that is, the point of contact at which there exists stability of the heart cam on its pivot, the stop hand registers 12 or the zero point on the minute scale of the watch dial.
  • the slide 7 is provided with a slot 8.
  • a stud passed through the slot secures the slide to the back plate on which it is adapted to slide and oscillate slightly to the left and right about the stud.
  • An exten sion from the slide (not shown) passes through an aperture in the plate somewhat larger than the extension and is engaged by the push pin 11.
  • the slide 7 is-provided with a thumb 7 the inner surface of which is engaged by a spring 10 suitably secured to the back plate and adapted to exert pressure radially outwardly.
  • a ratchet wheel 6 which is provided with nine ratchet teeth, is engaged on the right side by the finger of the slide 7 which is adapted to actuate it in a clockwise direction, one-ninth of a complete rotation upon each full inward move-' ment of the slide 7 or the push pin 11 which actuates the slide, and is engaged on the left side by the end of a spring that engages the ratchet and holds it positively against counterclockwise movement and resiliently and frictionally against clockwise movement.
  • This ratchet wheel 6 is secured to the cam 4 and therefore moves with and controls the movement of the cam.
  • This cam 4 might be called a clover-leaf cam and the ratchet wheel 6 associated therewith having in the present case nine teeth is so constructed as to have a definite ratio, that is, three to one between the number of its teeth and the number of leaves to the cam.
  • the stop-resetting lever 12 is shown in retracted position as if the thumb 12 were bearing on one of the three cam surfaces of the cam 4.
  • the L-shaped bellcrank lever is shown in dotted lines as if the end of the longer arm were in engagement with one of the three concavities in the cam 4.
  • the pinion 2 is in operative engagement with the wheel 1 and the stop hand or auxiliary second hand 19 rotates about the dial of the watch case once in each sixty seconds.
  • This spring is formed from a flat strip bent at suitably removed points to form loops.
  • the loop at one end has a small extension.
  • This loop is adapted to surround the arbor and provides a stop, for the pinion 2 is fast on the arbor 15, against downward movement of the arbor, as clearly shown in Figures 4 and 5.
  • the loop on the right side has a longer extension so that not only is a pivotal bearing on the back plate afforded for the spring but the extension affords a ready means of adjustment of the tension of the spring as a whole, the extension being adapted to bear near its end against a stop in the plate.
  • the loop of spring 16 about the arbor 15 has an important function in that it prevents vibration of the stop head 19 upon starting or stopping in the inoperative position of gears 1 and 2 or immediately before or after they are interacting in the operative position of the stop attachment.
  • the width of the flat strip is such that the spring lies entirely beneath the plane of movement of the stop-resetting lever 12, which is in turn beneath the plane of movement of the bell-crank lever 3.
  • the center wheel 17 is shown mounted in the plates A and B of the watch move ment.
  • the center wheel 17 is provided with an axial cylindrical bore extending through the wheel.
  • the arbor 15 is a cylindrical pin of steel having near its lower end a disk 18. This disc 18 and the approximate wall of the bore form a bearing for one end of the arbor 15.
  • the first push on the push pin 11 throws the thumb 12 from the concavity of cam 4 so that the finger 12 is released from the heart cam 14. Simultaneously the end of the long arm of the bell-crank lever 3 sinks in a concavity in the cam 4, permitting movement of the lever on its pivot brought about by pressure of the main spring 16 on the arbor 15 which has a bearing in the short arm of the bell-crank lever 3, in this manner bringing the pinion 2 into mesh with the Wheel 1.
  • the stop hand 19 commences to rotate from zero position over 12, and traverses the circumference of the dial once in each sixty seconds.
  • the second push on the push pin 11 throws the long arm of the bell-crank lever out of the concavity in the cam 4 and carries the short arm, and together with itthe arbor 15 and pinion 2 directly away from wheel 1.
  • the lever 12 is still held by the cam surface in retracted position, its finger 12 removed from the heart cam 14. Upon the second push therefore the stop hand ceases to move and a reading on the dial may be made.
  • the third push on the push pin 11 permits the spring 13 to throw the lever 12 in a clockwise direction and to bring the thumb 12 into the next concavity in the cam 4,
  • the stop hand is re set at the initial or zero position over 12 on the dial.
  • a center wheel having a cylindrical bore extending therethrough, an arbor adapted to extend through said bore and carry a stop hand on its outer end, means forming a bearing for moving the inner end of the arbor into inoperative position, a spring bearing .on said arbor and tending to move said arbor into operative position, and a circular disc fast on said arbor near its lower end and disposed within said cylindrical bore.
  • a center wheel having a cylindrical bore extending therethrough, an arbor adapted to extend through said bore and carry a stop hand on'its outer end, means forming a bearing for moving the inner end of the arbor into inoperative position, a spring bearing on said arbor and tending to move said arbor into operative position, and means for adjusting the tension of said spring, and a. circular disc fast on said arbor near its lower end and disposed within said cylindrical bore.
  • a center wheel having a cylindrical bore extending there: through, an arbor adapted to extend through said bore and carry a stop hand on its outer end, means forming a bearing for moving the inner end of the arbor into inoperative position, a spring bearing on said arbor and tending toimove said arbor into operative position, said spring having an extension whereby the tension of the spring on the arbor may be adjusted and a circular disc fast on said arbor near its lower end and disposed within said cylindrical bore.
  • a center wheel having a cylindrical bore extending therethrough, an arbor adapted to extend through said bore and carry a stop hand on its outer end, means forming a bearing for moving the inner end of said arbor, into inoperative position, a spring having a loo-p about and bearing on said arbor and tending to move said arbor into operative position, and a circular disk fast on said arbor near its lower end and disposed within said bore.
  • a stop-watch having a split-seconds hand adapted to turn over the dial of the watch, in combination a center wheel provided with a cylindrical bore, an arbor having a part adapted to form a bearing on the inner wall of said bore, and a spring mounted on the back-plate and looped about the arbor so as to provide suiiicient friction to prevent the turning of the arbor in the bearing while the center wheel is turning.
  • a stop movement for low-priced watches comprising in combination a center wheel having a cylindrical bore extending there through, and an arbor extending through said bore and having on one end a removably mounted stop hand, said arbor comprising a cylindrical pin of steel which has a disc fixed thereto that is adapted to form with the bore a bearing for the arbor.
  • a center wheel having a cylindrical bore extending therethro-ugh, an arbor extending through said bore, said arbor having a disc secured thereto, the disk forming with said bore a bearing for the arbor near one end, a fine-tooth pinion fast on said arbor and adapted to mesh with a fine-tooth wheel mounted to turn with the third wheel of a watch movement, and an L-shaped bellcrank lever adapted to throw said pinion into and out of mesh with said wheel, the short arm of said bell-crank lever having a bore to provide a bearing for the other end of said arbor.
  • a center wheel having a cylindrical bore extending therethrough, an arbor extending through said bore, said arbor having a disc secured thereto, the disk forming with said bore a bearing for the arbor near one end, a fine-tooth pinion fast on said arbor and adapted to mesh with a fine-tooth wheel mounted to turn with the third wheel of a watch movement, a spring adapted to hold said arbor in operative position, said spring having a loop about said arbor which acts as a stop against downward movement of said arbor, and an Lshaped bell-crank lever adapted to throw said pinion into and out of mesh with said wheel, the short arm of said bell-crank lever having a bore for the end of said arbor adjacent the pinion.
  • a split-seconds hand in combination a spring-retracted push-pin, a combined ratchet wheel and circular cam pivotally mounted on the back-plate of the watch and adapted to be rotated by said push-pin, a finger pivotally mounted at one side of the cam and having a resilient contact with the said side of the cam, an L-shaped bellcrank lever pivotally mounted on another side of the cam and having its long arm positioned to be actuated by the cam, and the short arm adapted to form a bearing for an arbor on the other end of which the split-seconds hand is mounted, and a spring bearing on the arbor and tending to bring said long arm of the bell-crank lever in contact with said cam.
  • a stop movement for low-priced Watches comprising in combination a push pin mounted in the edge of the watch case and engaging an extension on a spring retracted slide mounted for radial and slight lateral movement on a stud secured to the back plate of a watch movement, a ninetooth ratchet wheel mounted to rotate on another stud and held in position by a spring after movement by the slide through one ninth of a circumference, a cam secured to the ratchet wheel, said cam having three surfaces in the same circumference separated each from the other by a curved depression, each of said cam surfaces being effective through two-ninths of a circumference, an arbor adapted to swing out of the axial line of its bottom bearing an Lshaped bellcrank lever mounted on a stud centrally disposed on the back plate, the end of the long arm of said lever being adapted to engage said cam surfaces, and the short arm of said lever providing a bearing for the top of said arbor which carries a stop hand on the other end thereof.
  • a stop movement for low-priced watches comprising a fine-tooth wheel mounted on the back plate of a watch movement to turn with the third wheel of the movement, a push pin mounted diametrically opposite said wheel, a slide mounted to move on said diameter, a ratchet Wheel in the path of said slide adapted to be actuated thereby, a cam above said ratchet and se cured thereto, a stop-resetting lever on' one side of said diameter having a thumb adapted to engage said cam, a coil spring fixed to said lever and said back plate serving to press said lever toward said diameter, an L- shape bell-crank lever mounted on the opposite side of said diameter, said bellcrank lever being adapted to oscillate in a plane above said stop-resetting lever, a spring mounted on said back plate beneath said lever and adapted to engage said ratchet, an arbor carrying a stop hand and having a bearing in the short arm of said bell-crank lever, said arbor being adapted to swing in a line approximately coincident with the diameter,
  • a stop Watch in combination, an arbor bearing a sweep-second hand, a center wheel provided with an axial core, said arbor having a bearing within said core, the opposite end of said arbor having a bearing in a laterally movable lever, a pinion mounted on the arbor for turning the arbor, a gear mounted on the seconds wheel, and means for preventing vibration and downward movement of the arbor as said gears intermesh or unmesh.
  • an arbor bearing a sweep second hand, a center wheel provided with an axial core, said arbor having a bearing within said core, the opposite end of said arbor having a bearing in a laterally movable lover, a gear mounted on the arbor for turning the arbor, a gear mounted on the seconds wheel, and a spring looped about the arbor for preventing vibration of the arbor as said gears intermesh or unmesh.
  • an arbor bearing a sweep second hand, a center wheel provided with an axial core, said arbor having a bearing within said core, the opposite end of said arborhaving a bearing in a laterally movable lever, a gear mounted on the arbor for turning the arbor, a gear mounted on the seconds wheel, and a spring looped about the arbor and bearing upon the arbor from opposite sides for preventing vibration of the arbor as said gears intermesh or unmesh.
  • a stop movement for low priced watches comprising in combination a push pin mounted in the edge of the watch case and engaging an extension on a spring retracted slide mounted for radial and slight lateral movement over a stud secured to the back plate of a watch movement, a ratchet wheel mounted to rotate on another stud, a clover-leaf cam secured to the ratchet wheel, said ratchet wheel having teeth proportionate in number to depressions on the periphery of said cam, said ratchet wheel being held in position by a spring after movement by said slide through a definite angular travel, and an L-shaped bell-crank lever mounted on a stud centrally disposed on the back plate, the end of the long arm of said lever being adapted to engage said cam surfaces, and the short arm of said lever providing a bearing for the top of an arbor which carries a stop hand on the other end thereof, a looped spring enveloping said arbor, and frictionally holding the same against vibration said L-shaped lever being pivoted at the union
  • a center wheel having a cylindrical core extending therethrough, an arbor adapted to extend through said core and carry a stop hand at its outer end, means forming a bearing on said arbor near its lower end and disposed within said cylindrical core, means forming a second second bearing being adapted to move said arbor laterally into inoperative position, a spring adapted to prevent downward movement bearing on said arbor tending to move said arbor laterally into operative position, and apinion on said arbor adapted to be moved to or out of operative position with a driving wheel due to lateral movement of said arbor.
  • a split second arbor carrying a hand at one end, a bearing. mountedon said arbor near said hand, a second bearing near the other end of said arbor, means for moving said and a driven pinion on said arbor adapted to be carried into and out of mesh with the driving pinion as said bearing is moved laterally.
  • a center wheel having a bore therein, an arbor extending through said bore and journaled therein, a fine-toothed pinion fast on said arbor and adapted to -1nesl1 with a fine-toothed wheel mounted to turn with the third wheel of a watch movement, a spring adapted to hold said arbor in operative position and against downward movement, and an L-shaped bell-crank lever adapted to throw said pinion into and out of mesh with said wheel, one arm of said bell-crank lever having a bore for the end of saidarbor adjacent the pinion.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Measurement Of Distances Traversed On The Ground (AREA)
US340639A 1919-11-25 1919-11-25 Stop watch Expired - Lifetime US1493125A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US340639A US1493125A (en) 1919-11-25 1919-11-25 Stop watch
CH92437D CH92437A (de) 1919-11-25 1920-10-30 Chronograph.
GB33193/20A GB154220A (en) 1919-11-25 1920-11-24 Improvements in stop watches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US340639A US1493125A (en) 1919-11-25 1919-11-25 Stop watch

Publications (1)

Publication Number Publication Date
US1493125A true US1493125A (en) 1924-05-06

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ID=23334303

Family Applications (1)

Application Number Title Priority Date Filing Date
US340639A Expired - Lifetime US1493125A (en) 1919-11-25 1919-11-25 Stop watch

Country Status (3)

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US (1) US1493125A (de)
CH (1) CH92437A (de)
GB (1) GB154220A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505237A (en) * 1943-08-18 1950-04-25 Yale & Towne Mfg Co Rate of load change measuring instrument
US3823612A (en) * 1971-08-20 1974-07-16 Smiths Industries Ltd Trip mechanisms

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505237A (en) * 1943-08-18 1950-04-25 Yale & Towne Mfg Co Rate of load change measuring instrument
US3823612A (en) * 1971-08-20 1974-07-16 Smiths Industries Ltd Trip mechanisms

Also Published As

Publication number Publication date
GB154220A (en) 1921-09-29
CH92437A (de) 1922-01-02

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