Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1994-12-21
1996-03-19
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Machine
811801, B25B 3300
Patent
active
054995540
DESCRIPTION:
BRIEF SUMMARY
The present invention is directed to a nut wrench device, especially for loosening or tightening wheel nuts or similar, comprising an input axle having operating means, an output axle having actuating means disposed at one of its ends, which actuating means has a non-round peg on which a nut socket or the like is non-rotatably secured for wrenching said nut, a force transmission mechanism which links the input axle with the output axle, and anchoring means to anchor the nut wrench device adjacent a second wheel nut spaced from said nut, whereby a force applied to the operating means is transmitted as a torque to the nut which is to be wrenched.
More particularly, the invention is primarily directed to a manual device for initially loosening a nut or bolt which is hard to budge, for example due to it having been tightened too hard or to its threads having stuck in its receiving thread because of corrosion, material migration, mechanical damage or similar. When the jammed thread engagement has been released, the nut or bolt can afterwards be loosened with a socket wrench, a cross-shaped wheel wrench or the like, or by also using the device of the invention thereafter. Conversely, a jammed (hard tightened) receiving thread can also be obtained with a final tightening with the device according to the invention.
Devices for tightening or loosening nuts or bolts have been previously described in many variations and a device which is particularly suited to wheel nuts is shown in Swedish patent specification no. 8400756-6 (publication no. 446 700), which comprises a gear mechanism disposed in a housing, an output axle disposed on one side of the housing, an adjustable anchoring means disposed on the same side, and an input axle disposed on the opposite side of the housing. The anchoring means comprises a peg set fast on a sliding body which is axially translatable along, and in profile-bound sliding engagement with, a guide rail. Although this device functions as intended, it is, however, beset with certain drawbacks. The sprocket mechanism to provide the mechanical advantage is an unnecessarily expensive and complicated solution, additionally requiring an enclosed and protective housing which also serves as the supporting means for the incorporated components. This leads to the device being comparatively heavy, requiring relatively large storage and working spaces and above all to the housing, during use, covering the wheel nuts and consequently obstructing threading of the wheel nut sockets onto the associated wheel nuts or bolts. Additionally, the device is difficult to use on vehicles having double wheel-sets, such as the rear wheels of trucks and similar.
The object of the present invention is thus to provide a nut device of low weight, which is easy to apply and operate and which requires minimal storage space.
A further object of the invention is to provide a nut wrench device which is simple and cheap to produce, and in which the incorporated components are supported by each other and by the relevant wheel nut, respectively.
These objects are achieved in accordance with the invention in a nut wrench device as defined above, which is characterized in that the anchoring means is disposed at one end of the input axle and the operating means is disposed at its second end, and the force transmitting mechanism comprises a link member which is connected to the input axle via its first end and connected to the output axle via its second end, the link member being disposed substantially at right angles to both the input axle and the output axle.
Further refinements of the invention will be apparent from the features specified in the subsidiary claims.
Preferred embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which:
FIG. 1 is a front view showing an embodiment of the nut wrench device of the invention;
FIG. 2 shows a side view of the device in FIG. 1;
FIG. 3 is a view similar to that in FIG. 1, showing an alternative embodiment of the nut wrenc
REFERENCES:
patent: 3392608 (1968-07-01), Schanen et al.
patent: 4104936 (1978-08-01), Sjostrom
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