GB411387A - Improvements in and relating to time-lag devices of the dash-pot and plunger type - Google Patents

Improvements in and relating to time-lag devices of the dash-pot and plunger type

Info

Publication number
GB411387A
GB411387A GB3471933A GB3471933A GB411387A GB 411387 A GB411387 A GB 411387A GB 3471933 A GB3471933 A GB 3471933A GB 3471933 A GB3471933 A GB 3471933A GB 411387 A GB411387 A GB 411387A
Authority
GB
United Kingdom
Prior art keywords
arm
switch
spring
pin
plunger
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
Application number
GB3471933A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3471933A priority Critical patent/GB411387A/en
Publication of GB411387A publication Critical patent/GB411387A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G04HOROLOGY
    • G04FTIME-INTERVAL MEASURING
    • G04F1/00Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

411,387. Retractive switches; snapaction switches ; retarding action of switches; hydraulic springs. HAMILTON, W., Woodlands, Wadhurst, Sussex. Dec. 9, 1933, No. 34719. [Class 38 (v).] A quick-action retractive switch with a dashpot time delay device, comprises a switch arm 8 pivoted at 9 and provided with a member 10 for bridging a pair of contacts 11. The arm 8 is connected by a spring 12, which can act both as a tension or a compression spring, to an arm 1 of a bell crank lever pivoted at 3, the other arm 2 of which bears a pin 6, adapted to engage a ramp 7 on the switch arm 8. The cone 1 is shown in an intermediate position in which the spring 12 is not under tension. If the arm 1 is turned in a clockwise direction, the spring 12 is tensioned but the switch arm 8 is restrained until the pin 6 passes off the end of the ramp 7 to allow the switch arm to open rapidly. From this position, if the arm 1 is turned anti-clockwise the pin 6 rests under the ramp 7 and prevents the arm 8 from moving down under the compression of the spring 12 until the pin 6 passes off the right hand end of the ramp 7 and the switch closes rapidly. To enable the switch to be closed for certain intervals, a dashpot 13 is provided with a plunger 14 moving in a viscous liquid such as glycerine, the hollow plunger rod 15 being slotted at its upper end to receive the arm 1 which is connected to the plunger 14 by a compression spring 19. A powerful spring 20 is fixed on a stud 21 and has one arm 22 held by a pin 24. The other arm 23 engages a pawl 16 pivoted at 17 to the arm 1 to bias it and the arm 1 in a clockwise direction. When the handle 5 is sharply depressed the switch is closed as described, and the arm 1 is held by the engagement of the hooked end 25A of the pawl 16 under a fixed abutment 28. The plunger 14 then slowly moves down under the action of the spring 19 until a pin 18 or the forked rod 15 trips the pawl 16. The spring 20 then moves the arm 1 and the plunger slowly upwards to open the switch as described. In a modification the cone 2 is loosely coupled to the arm 1 so that the switch can be opened again quickly independently of the dashpot. Specification 395,801 is referred to.
GB3471933A 1933-12-09 1933-12-09 Improvements in and relating to time-lag devices of the dash-pot and plunger type Expired GB411387A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3471933A GB411387A (en) 1933-12-09 1933-12-09 Improvements in and relating to time-lag devices of the dash-pot and plunger type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3471933A GB411387A (en) 1933-12-09 1933-12-09 Improvements in and relating to time-lag devices of the dash-pot and plunger type

Publications (1)

Publication Number Publication Date
GB411387A true GB411387A (en) 1934-06-07

Family

ID=10369127

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3471933A Expired GB411387A (en) 1933-12-09 1933-12-09 Improvements in and relating to time-lag devices of the dash-pot and plunger type

Country Status (1)

Country Link
GB (1) GB411387A (en)

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