GB2331784A - Cog wheel cam for lock cylinders - Google Patents

Cog wheel cam for lock cylinders Download PDF

Info

Publication number
GB2331784A
GB2331784A GB9725096A GB9725096A GB2331784A GB 2331784 A GB2331784 A GB 2331784A GB 9725096 A GB9725096 A GB 9725096A GB 9725096 A GB9725096 A GB 9725096A GB 2331784 A GB2331784 A GB 2331784A
Authority
GB
United Kingdom
Prior art keywords
cog wheel
wheel cam
cam
key
lock cylinders
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.)
Withdrawn
Application number
GB9725096A
Other versions
GB9725096D0 (en
Inventor
Simon Napthine
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 GB9725096A priority Critical patent/GB2331784A/en
Publication of GB9725096D0 publication Critical patent/GB9725096D0/en
Publication of GB2331784A publication Critical patent/GB2331784A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B17/00—Accessories in connection with locks
    • E05B17/04—Devices for coupling the turning cylinder of a single or a double cylinder lock with the bolt operating member
    • E05B17/042—Devices for coupling the turning cylinder of a single or a double cylinder lock with the bolt operating member using toothed wheels or geared sectors
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
    • E05B15/004—Lost motion connections

Landscapes

  • Transmission Devices (AREA)
  • Gears, Cams (AREA)

Abstract

A cog wheel cam 1 which allows a degree of lost motion in the drive mechanism between a lock cylinder key and the cog wheel cam. This allows the cog wheel cam to rotate less than the 360‹ rotated by the cylinder key.

Description

G i 2331784 COG WHEEL CAM WITH REDUCED ROTATION FOR LOCK CYLINDERS This
invention relates to a means of reducing the angle of rotation of a cog wheel cam.
Standard lock cylinders are used for operating many different types of locks. In some, the operation is as follows. The key is inserted into the cylinder and must then be rotated through 3600 before the key can be removed. This rotation operates the lock mechanism, to which the cylinder is fitted, via the cylinder cam. Cylinder cams are sometimes in the form of a pinion and are known as 'cog wheel cams'. These are used to operate locks on the "rack and pinion" principles.
It follows that the cog wheel cam fitted to the cylinder must move the rack a distance equivalent to the effective circumference of the cog wheel cam during one rotation of the key. It may sometimes be desirable to reduce the distance to which the rack is moved.
One method of reducing the movement of the rack is to employ a pinion of smaller circumference, but this method has limitations due to the drive mechanism required within the pinion.
According to the present invention means are provided in the drive mechanism between a cylinder key and a cog wheel cam which provide an amount of free rotation between the key and the cog wheel cam. This allows the cog wheel cam to rotate less than the 3601 rotated by the cylinder key.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:- Figure 1 shows in perspective one type of lock cylinder fitted with a cog wheel cam.
Figure 2 is a section through a cog wheel cam showing one means of providing the "free movement" refered to above.
Refering to figure 2, the drive dog 2 is rotated by the key and in turn rotates the cog wheel cam 1. 3 is the space in which the drive dog 2 is free to rotate before it begins to rotate the cog wheel cam 1.
0 2

Claims (1)

  1. A means is provided in the drive mechanism between a cylinder key and a cog wheel cam which provide an amount of free movement between the key and the cog wheel cam. This allows the cog wheel cam to rotate less than the 3600 rotated by the cylinder key.
    A means according to claim 1 in which an amount of free movement is provided between a cylinder key and the drive dog which operates the cog wheel cam.
    A means according to claim 1 in which an amount of free movement is provided between the drive dog and the cog wheel cam.
GB9725096A 1997-11-28 1997-11-28 Cog wheel cam for lock cylinders Withdrawn GB2331784A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9725096A GB2331784A (en) 1997-11-28 1997-11-28 Cog wheel cam for lock cylinders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9725096A GB2331784A (en) 1997-11-28 1997-11-28 Cog wheel cam for lock cylinders

Publications (2)

Publication Number Publication Date
GB9725096D0 GB9725096D0 (en) 1998-01-28
GB2331784A true GB2331784A (en) 1999-06-02

Family

ID=10822729

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9725096A Withdrawn GB2331784A (en) 1997-11-28 1997-11-28 Cog wheel cam for lock cylinders

Country Status (1)

Country Link
GB (1) GB2331784A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114909035B (en) * 2022-06-02 2024-06-14 曹县精锐机械锁业有限公司 Anti-theft mechanical lock core, mechanical lock and key

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041217A1 (en) * 1980-06-04 1981-12-09 Gretsch-Unitas GmbH Baubeschlagfabrik Drive for at least one bolt
GB2179091A (en) * 1985-08-06 1987-02-25 Hardware & Systems Patents Ltd Fastener

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041217A1 (en) * 1980-06-04 1981-12-09 Gretsch-Unitas GmbH Baubeschlagfabrik Drive for at least one bolt
GB2179091A (en) * 1985-08-06 1987-02-25 Hardware & Systems Patents Ltd Fastener

Also Published As

Publication number Publication date
GB9725096D0 (en) 1998-01-28

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)