Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Structure is coaxial – distinct member that restricts nut piece
Patent
1994-02-24
1995-10-24
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Structure is coaxial, distinct member that restricts nut piece
411254, 411317, 411950, F16B 3910, F16B 39284
Patent
active
054604672
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Many types of nuts with positive locking are already known, the most common one is the castellated nut associated with a pin installed in a hole of the shaft on which the nut is screwed and which extends at one and the same time in this hole and in two crenels of the nut.
This particular type of nut has some disadvantages inherent to its structure, particularly an insufficient strength, a poor reaction to the vibrations and a limited effectiveness.
It has been improved by introducing a locking device in the nut with positive locking. This type of nut is particularly described in the documents FR-A-2 358 580 and U.S. Pat. No. 4,328,720.
Document EP-0 102 898 describes a particular example of a nut device with positive automatic locking intended to be fixed in rotation on the shaft and having a locking element.
In this document, the locking element has the shape of a threaded ring confined in a counterbore of the nut with which it is associated in rotation. The ring has serrations along its internal thread intended to cooperate with the complementary serrations of the threaded portion of the shaft when both threads of the ring and the nut are in phase.
Nevertheless, the effectiveness of such a nut may be compromised under the effect of vibrations.
Document FR-A-2 321 625 describes a lock nut comprising mainly a ring with internal serrations and an opened toric ring lodged in a circular groove located on the external part of this ring. One should note on the one hand that this ring is made in one piece, and on the other hand that this ring is in this case, acting as a retainer circular clip in the said nut to lock.
Document GB-A-547 624 mentions the possibility of a locking obtained by the pressure of the threads of the nut on those of the shaft, pressure obtained by a resilient toric opened ring pressing radially a rear and solidary skirt of the nut partially made malleable by radial millings. It will also be noted that the artificial segmentation obtained by millings in the nut is integrally making part of the nut. From another side, the obtained locking is a limited locking totally dependant of the friction capacities of the thread of the nut in relation to the thread of the screw.
SUMMARY OF THE INVENTION
The present invention provides an improved nut that may be locked surely and efficiently on a shaft, without the drawbacks of the nuts of the prior art, the locking being of positive automatic type.
In particular, the present invention aims at providing an improved nut intended for applications located in high vibrations levels. The nut according to the present invention will even have propensity to absorb and reduce the vibrations to which it is submitted.
The present invention concerns an automatic positive locking nut intended to be screwed onto a shaft having a serrated thread, said nut comprising a locking element with serrations on its internal diameter intended to fix the nut in rotation on the shaft, this locking element being confined in a counterbore of the nut and being axially movable in said counterbore between a first locking position and a second unlocking position characterized in that the locking element comprises a segmented, radially expandable serrated ring, the segmented ring being engaged by a generally coaxial resilient member which biases the serrated ring segments radially toward the axis of the nut.
The said locking position corresponds to the position for which the serrations of each segment of the locking element cooperate perfectly with the complementary serrations along the thread of the shaft, and the said unlocking position corresponds to the position in which the serrations of each segment of the locking element are totally disengaged from the serrations along the thread of the shaft.
The present invention also concerns a device to lock and unlock the nut on the shaft in accordance with the present invention characterized in that it comprises a hollow socket delimiting a housing adapted to receive the nut according to the present invention.
REFERENCES:
patent: 692572 (1902-02-01), Wilcox
patent: 830787 (1906-09-01), Hill
patent: 1414761 (1922-05-01), Thamann
patent: 1555576 (1925-09-01), Hokanson
patent: 3167105 (1965-01-01), Rosan
patent: 3422869 (1969-01-01), Lanius, Jr.
patent: 5215336 (1993-06-01), Worthing
European Locking Devices S.A.
Wilson Neill R.
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