GB851500A - Improvements in or relating to step-by-step driving devices - Google Patents

Improvements in or relating to step-by-step driving devices

Info

Publication number
GB851500A
GB851500A GB39490/57A GB3949057A GB851500A GB 851500 A GB851500 A GB 851500A GB 39490/57 A GB39490/57 A GB 39490/57A GB 3949057 A GB3949057 A GB 3949057A GB 851500 A GB851500 A GB 851500A
Authority
GB
United Kingdom
Prior art keywords
pawl
wheel
spring
loaded
pivoted
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
GB39490/57A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB851500A publication Critical patent/GB851500A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H31/00—Other gearings with freewheeling members or other intermittently driving members
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Telephone Set Structure (AREA)
  • Transmission Devices (AREA)

Abstract

851,500. Ratchet gearing. PHILIPS ELECTRICAL INDUSTRIES Ltd. Dec. 19, 1957 [Dec. 22, 1956], No. 39490/57. Class 80 (3). In ratchet mechanism, particularly for automatic telephone systems, wherein in order to prevent over-run the end 9 of a pawl 8 driving a ratchet wheel 12 engages a stationary guide surface 13 extending parallel to the. rest position of the adjacent tooth surface 17, the pawl end 9 is formed as two concentric arcuate surfaces, preferably of different radii, contacting respectively the tooth surface 17 and the guide surface 13. Thus as the pawl 8 moves to the left it can move angularly relatively to the parallel surfaces 17, 13 while still maintaining constant the distance between the surfaces, and hence still preventing over-run of the wheel 12. As shown the pawl 8 is pivoted to the spring- loaded pivoted armature of an electromagnet 2 and is loaded by a blade spring 21. A spring- loaded pivoted pawl 18 prevents backrunning of the wheel 12. The pawl 8 is preferably made of nylon.
GB39490/57A 1956-12-22 1957-12-19 Improvements in or relating to step-by-step driving devices Expired GB851500A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL851500X 1956-12-22

Publications (1)

Publication Number Publication Date
GB851500A true GB851500A (en) 1960-10-19

Family

ID=19847115

Family Applications (1)

Application Number Title Priority Date Filing Date
GB39490/57A Expired GB851500A (en) 1956-12-22 1957-12-19 Improvements in or relating to step-by-step driving devices

Country Status (1)

Country Link
GB (1) GB851500A (en)

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