Locks – Special application – For control and machine elements
Patent
1991-04-03
1994-01-18
Gall, Lloyd A.
Locks
Special application
For control and machine elements
70233, 70386, 280279, 280280, 403374, B62H 504, E05B 7100
Patent
active
052791378
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to an anti-theft device.
FIELD OF THE INVENTION
In particular the present invention is particularly intended to use with a bicycle especially a bicycle, though it is to be understood that the invention is of general applicability.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention there is provided an anti-theft device comprising a pair of members concentrically rotatable with respect to each other, one member having an aperture, the other member having a recess, a rolling body carried in the aperture, said recess and aperture being capable of being aligned on relative rotation between said members whereby the rolling body is receivable in both the aperture and recess, a locking means having a locked mode at which the locking means engages said rolling body to maintain said rolling body in engagement with the aperture and recess, the locking means having an unlocked mode at which the rolling body is freely movable into and out of engagement with the recess when the aperture and recess are aligned and a fixing means to fix the anti-theft device to the steering mechanism of a vehicle.
In accordance with a further aspect of the present invention there is provided a vehicle fitted with an anti-theft device in accordance with the present invention.
In accordance with another aspect of the present invention there is provided a bicycle fitted with an anti-theft device in accordance with the present invention.
In accordance with yet another aspect of the present invention there is provided a bicycle head stem fitted with an anti-theft device in accordance with the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a side view of a bicycle head stem incorporating the anti-theft device of the present invention;
FIG. 2 is a sectional side view of the bicycle head stem of FIG. 1; and
FIG. 3 is a sectional plan view of the bicycle head stem of FIG. 2.
FIG. 4 is a side view showing the invention as mounted on the frame headstock of a bicycle headstock, the bicycle having a wheel on a fork, rotatable on an axis for steering the bicycle and releasable according to the invention to disable steering control.
DESCRIPTION OF THE INVENTION
Shown in FIGS. 1 to 3 is a bicycle head stem 10 having fixing means in the form of a clamp 12 to secure a handle bar (not shown). The clamp means 12 is spaced apart from a first tube member 16 having an inner surface 17, by means of a bridge member 18. Rotatable within the first tube member 16 is a second tube member 20 which has one end 21 located within the first tube member 16 and another end 22 located externally of the first tube member 16.
The end 22 has a securing means broadly designated by the numeral 24 arranged to secure the head stem 10 into the fork steering post of a bicycle. The securing means 24 comprises a threaded bolt 26 arranged to move a tapered plug 28 which is provided with an inclined face 30. The bolt 26 has a head which rests on an internal shoulder 27 of the second tube member 20. The end 22 may also have an inclined face 31 which in use is arranged to bear against the face 30 of the plug 28 in known manner. As a result of the inclined faces 30 and 31, when the bolt 26 is rotated, the plug 28 is forced outwardly against the headstock of the bicycle and thereby secures the stem 10. Such securing means 24 are well known in the art of bicycles.
Shown in FIG. 3 is an anti-theft device broadly designated by the numeral 32 and comprising a plurality of equi-angularly spaced radial recesses 36 on the inner surface 17 of the first tube member 16.
The second tube member 20 is provided with a plurality of equi-angularly spaced apertures 38 extending therethrough. The number of recesses provided in the first tube member 16 equals the number of apertures provided in the second tube member 20. A rolling body in the form of a cylindrical roller 40 is carried in each a
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patent: 1623455 (1927-04-01), Andrew
patent: 2139984 (1938-12-01), Southwell et al.
patent: 3785676 (1974-01-01), Klein, Jr.
patent: 4030321 (1977-06-01), Kenyon
patent: 4901544 (1990-02-01), Jang
patent: 5085063 (1992-02-01), Van Dyke et al.
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