Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Comprising a thread lock
Patent
1994-03-15
1996-07-30
Redman, Jerry
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Comprising a thread lock
403370, F16B 3922
Patent
active
055405290
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an internal or external locking member and more exactly a locking member or a locking nut for an internal or external threaded or non-threaded surface.
PRIOR ART
Within mechanical engineering there is a great demand of locking members in the form of locking nuts. Locking nuts are normally available in two different applications, partly in a so called self-locking application and partly in an application having a mechanically influenced device to lock the nut in a certain fixed position. A self-locking nut may normally be used one time only, while the other type of nut is intended to be used a number of times still having adequate locking capacity.
Prior art presents numerous locking elements of the latter type. In GB-A-2 221 506 is disclosed a lockable threaded member for axial adjustment. The member presents radial slots dividing the member into thick and thin cantilevered portions. The thin cantilevered portions, generally of a number of two, may each axially be displaced relative to the thick portion by means of a pulling screw. A disadvantage with this type of locking is that when releasing a locked member, the member must be knocked free to cause the thin cantilevered portions to return to neutral positions after the screw is released. As in the demonstrated embodiment this member demands a special pinned tool for each dimension of such a locknut to be able to convey it an or off a thread. Furthermore the design also implies that the number of locking means will be limited.
In a Swedish document SE 431 011 is disclosed another variant of a lockable nut comprising two annular portions connected by preferably elastic means. Locking occurs by tightening of a screw arranged i one of the portions of the nut and resting against the other portion of the nut. The design has the known disadvantage that it generally will tilt somewhat on the thread due to that the principle of locking is based on a tilt of one portion in relation to the other portion. Additionally the manufacturing is unnecessary complicated due to that, except the locking screw itself, the locking nut comprises a number of separate different elements. Also here is generally needed a special tool for each dimension of the nut to tighten the nut and dependent of if the nut is provided with a female or male thread.
In a German document DE-2 228 062 from 1972 is additionally disclosed a locknut having a wedge-shaped cut permitting the nut to be clamped by means of a screw. This nut then also suffers from the same disadvantage of not locking flat with the thread by becoming unsymmetrical in the axial direction from the way it is being clamped upon locking. Furthermore such a nut may be hard to release as it simply may damage the threads by being deformed upon locking. An almost identical solution having the same disadvantage is also disclosed in the document FR 668 722 dated Jul. 22, 1929.
In GB-1 392 182 is also disclosed a design having a rigid collar and a member having a cylindrical passage for a shaft, whereby it is provided with means for tilting of the rigid collar relative to the member at a position to get a misalignment between the collar and the member to achieve a locking operation.
Additionally in GB-A-2 177 178 is disclosed an adjustable locknut being adjusted by a radially inserted locking screw. The drawback of this design is that it is only applicable where a peripheral access of the nut always is possible. The design furthermore is only applicable for a locking against a male thread.
A British document GB-1 296 887 and a French document FR-2 407 385 discloses a locknut for internal respective external locking. Both designs rely on a partly conical shape of a part the threaded portion of the element, which has a drawback that these nuts show a large friction when used and will consequently wear the thread of the corresponding element where the locking is performed.
Finally from U.S. Pat. No. 3,168,228 is known a device to render a clamping action by means of a number of bolts clamping a member wh
REFERENCES:
patent: 171898 (1876-01-01), Wiles
patent: 2409204 (1946-10-01), Gall
patent: 3168228 (1965-02-01), Lewis
patent: 3443432 (1969-10-01), Joy
patent: 3664692 (1972-05-01), Spieth
patent: 4043692 (1977-08-01), Hund
patent: 4452547 (1984-06-01), Thiel et al.
patent: 4557652 (1985-12-01), Lundgren
patent: 4622730 (1986-11-01), Steinbock
Derwent's abstract, No. 88-262 545/37, SU 1 375 873, publ. week 8837, 1 page.
Jansson Borje
Jansson Stefan
INA Walzlager Schaeffler KG
Redman Jerry
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