US3823612A - Trip mechanisms - Google Patents

Trip mechanisms Download PDF

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Publication number
US3823612A
US3823612A US00279400A US27940072A US3823612A US 3823612 A US3823612 A US 3823612A US 00279400 A US00279400 A US 00279400A US 27940072 A US27940072 A US 27940072A US 3823612 A US3823612 A US 3823612A
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US
United States
Prior art keywords
lever
plunger
operating
positions
cap
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
US00279400A
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English (en)
Inventor
C Boult
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Application granted granted Critical
Publication of US3823612A publication Critical patent/US3823612A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G04F7/0852—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms with member having a rotational two-way movement, e.g. navette
    • 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
    • Y10T74/18—Mechanical movements
    • Y10T74/18888—Reciprocating to or from oscillating
    • Y10T74/18896—Snap action
    • 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
    • Y10T74/18—Mechanical movements
    • Y10T74/18888—Reciprocating to or from oscillating
    • Y10T74/18896—Snap action
    • Y10T74/18904—Plate spring

Definitions

  • a trip mechanism for a stop-watch has a pivotally mounted operating lever movable between two operative positions to inhibit or enable movement of the hands of the watch.
  • An engagement member engageable with the operating lever to switch it between its two positions is in the form of a unitary plunger having a bifurcated end so as to provide two parts each for engaging a distinct one of two elements, or notches, of the lever in accordance with the position of the lever when the mechanism is operated.
  • a spring is coupled to the lever and acts to bias the lever in the manner of an over-centre toggle into its two operative, positions.
  • the plunger extends from its bifurcated end into abutment with the interior of a hollow pushbutton cap, and is acted upon by a spring to maintain this abutment and at the same time spring bias the push-button into the rest position. Depression of the push-button displaces the plunger longitudinally towards the lever so as to bring about the appropriate engagement of the bifurcated end with the lever notches.
  • This invention relates to trip mechanisms and is more particularly, although not exclusively, concerned with the provision of such mechanisms for controlling the movement of the hands of a stop-watch.
  • One form of trip mechanism in use at present includes a turret wheel which is rotatable about its axis in a number of predetermined angular steps under the influence of a push rod.
  • the push rod is associated with a push-button and whenever that button is depressed, acts on the turret wheel so as to rotate it.
  • the turret wheel moves one end of an operating lever between two or more, positions. In moving between these positions the lever effects the desired control, for example in a stop-watch the lever may urge a stop-pin end of spring 17 bears against a ledge 18 formed on the inner wall of the sleeve 15, and the lip 14 engages an inner rim-surface 19 of the casing so as to retain the button 13 and the plunger 16.
  • the operating plunger 16 has a bifurcated lower end 21 and terminates in two wedges 22 and 23 engageable with notches 24 and 25 into engagement ,with the balance wheel thereby stopping the watch.
  • An object of this invention is to substantially alleviate or overcome some or all of the above disadvantages.
  • a trip mechanism has 'a pivotally-mounted operating-lever which is movable about the axis of its pivotal mounting between first and second positions, and an engagement member which is operable to move towards the lever and engage therewith for switching the lever from one to the other of its first and second positions, the engagement member when operated as aforesaid with the lever in its said first position engaging with a first of two distinct elements of the lever to pivot the lever into its said second position, and when operated as aforesaid with the lever in its said second position engaging with the second of the two elements of the lever to pivot the lever .into its said first position.
  • FIG. 1 is a rear view of the stop-watch with the casing partially broken away to show part of the trip mechamsm
  • FIGS. 2, 3 and 4 are schematic representations of the trip mechanism that serve to illustrate its operation.
  • the casing 10 of the stop-watch houses a movement 11 only part of which is shown.
  • a reset and winding button 12 which may be operated both to wind the watch and to reset its hands to zero, is carried by the movement 11 to extend through a hole in the casing 10.
  • the reset mechanism may conveniently comprise a mechanism such as is described in my co-pending US. Pat. Application Ser. No. 279,401, filed Aug. 10, 1972).
  • Also passing through a hole in the casing is a stop-start, or brake button 13 for controlling the movement of the hands of the watch.
  • the button 13 is in the form of a hollow cup having a lip 14 formed at its open end, and is slidably mounted on a hollow sleeve 15 carried by the casing 10.
  • An operating plunger 16 is located within the hollow sleeve 15 and its upper end, which is in the form of a pad, is urged against the inside upper end of the button 13 by a spring 17.
  • the lower respectively formed on a rocker lever 26.
  • the rocker lever 26 (not shown in FIG. 1) is pivotally mounted at 27 in support plates 28 carried by the casing 10. This lever carries a pin 29 located in the bifurcated end of a brake lever 30 pivotally mounted, at 31, on the movement 11.
  • Levers 26 and 30 are movable under the influence of plunger 16 between first and second positions shown respectively in FIGS. 2 and 4.
  • Attached to the other end of the brake lever 30 is one end of a brake rod 32, the other end of which is fixed to the movement 11 as indicated.
  • a stop pin 34 is carried by the'brake lever 30 and is engageable with the balance wheel of the watch in a known way. Movement of the brake lever 30 about its pivot 31 moves the brake rod 32 and stop pin 34 into and out of engagement with respectively a brake drum 33 mounted on the drive shaft'(not shown) of the hands of the watch and the balance wheel 35.
  • a stop 36 is formed on the brake lever 30 and is operative, as will be described more fully below, to prevent the hands of the watch being accidentally reset while in motion.
  • a spring 37 which is attached to a pin 38 in one ofthe support plates in the casing 10 and to the pin 29 acts to locate the lever 26 in each of its two operative positions following movement of it, in the manner of an overcentre toggle.
  • the button 13 is depressed against the-action of spring 17 and this acts to move the plunger 16 inwardly toward the lever 26. As shown in FIG. 2, this will'cause the wedge 23 to engage the surface-25 and move the operating end of the plunger 16 sideways. Further depression of the button 13 will push the surface 25 inwardly of the watch and rotate the lever 26 about the pivot 27. During this operation the axis of plunger 16 will be displaced angularly relative to the axis of the stop/start button 13, as shown in'FIG. 3.
  • the spring 37 will, once the lever 26 is past its central position, force the lever 26 to its second operative position (that shown in FIG. 4).
  • the button 13 When it is desired to stop the hands of the watch, the button 13 is again depressed and it will be seen that on this occasion the wedge 22 engages the surface 24 and rocks the lever 26 back into the position shown in FIG. 2. Again the spring 37 causes this action to take place with a snap.
  • the pin 29 causes the brake lever 30 to rotate about pivot 31 in a counter-clockwise sense, and the brake pin 34 engages the balance wheel 35 stopping the watch at the same time as the brake rod 32 engages the drum 33.
  • the stop 36 is also moved out of engagement with the lip 39 so that the button 12 may now be depressed to reset the hands of the watch to zero.
  • the purpose of brake rod 32 and brake drum 33 is to lock the spindle carrying the seconds hand so that the effect of backlash in the gear train is eliminated when the hands are reset to zero.
  • the hands of the watch need not be reset to zero but may be merely restarted, by operation of button 13, and in this way the watch may be used, for example as a match-timer.
  • a trip "mechanism comprising an operating-lever having first and second parts rigidly interconnected with oneanother, means mounting the operating-lever on an axis for pivotal movement between first and second positions about said axis, said pivotal axis being located intermediate said first and second parts on said operating-lever, and actuation means which is depressable to effect switching of said lever from one to the other of said first and second positions, said actuation means comprising a unitary plunger member of elongate form, said plunger member having first and second elements thereof spaced from one another transversely of the plunger for engagement with said first and second parts respectively of said lever, means mounting the plunger member for longitudinal displacement from a rest position towards said lever upon each depression of said actuation means to engage said first element of the plunger member with said first part ofthe lever when said lever is in said first position and said second element of the plunger member with said second part of the lever when said lever is in said second position, the said engagement of said first element with Y 4 said first part urging said lever into
  • a trip mechanism comprising an operating-lever having first and second parts spaced from one another,
  • said actuation means comprising a hollow push-button cap mounted for selective depression from a rest position, a plunger having a bifurcated end to provide first and second elements spaced from one another for engagement with said first and second parts respectively of said lever, said plunger extending from said bifurcated end into said ,hollow cap to abut with the interior of the cap so that depression of said cap from its restposition depresses the plunger to engage said first element with said first part of the lever when said lever is in said first position and said second element with said second part of the lever when said lever is in said second position, the said engagement of said first element with said first part urging said lever into said second position and of said second element with said second part
  • a trip mechanism as claimed in claim 1 including spring means coupled to the said operating-lever to provide an over-centre toggle action by which the operating-lever is biased into one or other of its said first and second positions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Braking Arrangements (AREA)
  • Mechanical Control Devices (AREA)
US00279400A 1971-08-20 1972-08-10 Trip mechanisms Expired - Lifetime US3823612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3908871A GB1405102A (en) 1971-08-20 1971-08-20 Stop watches

Publications (1)

Publication Number Publication Date
US3823612A true US3823612A (en) 1974-07-16

Family

ID=10407568

Family Applications (1)

Application Number Title Priority Date Filing Date
US00279400A Expired - Lifetime US3823612A (en) 1971-08-20 1972-08-10 Trip mechanisms

Country Status (9)

Country Link
US (1) US3823612A (enrdf_load_stackoverflow)
JP (1) JPS5613274B2 (enrdf_load_stackoverflow)
AT (1) AT335919B (enrdf_load_stackoverflow)
AU (1) AU468534B2 (enrdf_load_stackoverflow)
CA (1) CA974372A (enrdf_load_stackoverflow)
CH (2) CH585431B5 (enrdf_load_stackoverflow)
DE (1) DE2240080A1 (enrdf_load_stackoverflow)
FR (1) FR2150388B1 (enrdf_load_stackoverflow)
GB (1) GB1405102A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927519A (en) * 1973-12-07 1975-12-23 Suisse Horlogerie Timepiece movement with a timer mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1550012B8 (fr) 2002-10-07 2010-05-19 CompliTime SA Montre de type chronographe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US448549A (en) * 1891-03-17 Stop-watch
US995681A (en) * 1910-03-16 1911-06-20 Howard H Kanagy Electric lamplighting device for automobiles.
US1493125A (en) * 1919-11-25 1924-05-06 Sterling Watch Company Inc Stop watch
US1540247A (en) * 1922-11-08 1925-06-02 Charles L Bowman Clutch-shifting device
US1658511A (en) * 1924-11-13 1928-02-07 Bruynis Carel Switch
US3712036A (en) * 1969-10-03 1973-01-23 Daini Seikosha Koto Ku Tokyo K Cam wheel mechanism for watches

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US448549A (en) * 1891-03-17 Stop-watch
US995681A (en) * 1910-03-16 1911-06-20 Howard H Kanagy Electric lamplighting device for automobiles.
US1493125A (en) * 1919-11-25 1924-05-06 Sterling Watch Company Inc Stop watch
US1540247A (en) * 1922-11-08 1925-06-02 Charles L Bowman Clutch-shifting device
US1658511A (en) * 1924-11-13 1928-02-07 Bruynis Carel Switch
US3712036A (en) * 1969-10-03 1973-01-23 Daini Seikosha Koto Ku Tokyo K Cam wheel mechanism for watches

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927519A (en) * 1973-12-07 1975-12-23 Suisse Horlogerie Timepiece movement with a timer mechanism

Also Published As

Publication number Publication date
FR2150388B1 (enrdf_load_stackoverflow) 1976-06-11
ATA707672A (de) 1976-07-15
AT335919B (de) 1977-04-12
CH1227172A4 (enrdf_load_stackoverflow) 1976-09-15
CA974372A (en) 1975-09-16
JPS4830464A (enrdf_load_stackoverflow) 1973-04-21
AU468534B2 (en) 1976-01-15
JPS5613274B2 (enrdf_load_stackoverflow) 1981-03-27
GB1405102A (en) 1975-09-03
AU4576572A (en) 1974-02-21
DE2240080A1 (de) 1973-02-22
CH585431B5 (enrdf_load_stackoverflow) 1977-02-28
FR2150388A1 (enrdf_load_stackoverflow) 1973-04-06

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