Wireworking – Implements – Stretchers
Reexamination Certificate
1998-10-23
2001-03-20
Larson, Lowell A. (Department: 3725)
Wireworking
Implements
Stretchers
C254S216000
Reexamination Certificate
active
06202706
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a cable tie installation tool and more particularly to an improved tensioning mechanism which utilizes a gripper gear having a recessed portion.
BACKGROUND OF THE INVENTION
Many different tools for applying individual cable ties around a bundle of elongated objects are known in the art. Many incorporate a tensioning mechanism having some form of gripper gear, and others have some form of gripping device, which slightly penetrates the strap with teeth extending therefrom in order to achieve sufficient traction for tensioning the cable tie to the desired tension. The gear teeth of the prior art,
FIG. 3
, extend completely across the gripping face of the gear, normal to the direction of rotation. This orientation and configuration causes the tool to be unable to achieve the desired elevated tensions commonly used because the strap cross-section is so sizably decreased by tooth penetrations or deformations. The result when this full-width gear tooth is used to tension the cable tie results in a cable tie which is pulled apart at one of the gear teeth penetrations due to the substantially reduced cross-sectional area, since the strength of the cable tie strap is directly related to this area. Accordingly, it would be desirable to fabricate a tensioning mechanism having a gripper gear which can be reliably and consistently tension a cable tie strap to an elevated tension, as is commonly now required without the strap separation or shearing before reaching the desired tension level.
SUMMARY OF THE INVENTION
It is therefore, an object of the present invention to provide an improved cable tie installation tool.
It is a further object of the present invention to provide a cable tie installation tool which has the ability to reliably and consistently tension bundles of elongated objects to elevated levels.
It is a still further object of the present invention to provide a cable tie installation tool which has a tensioning assembly that increases the cross-sectional area of the cable tie strap during tensioning.
In general, the cable tie installation tool of the present invention can be used to advance and fasten an individual cable around a bundle of elongated objects. Normally, a cable tie includes a strap and a strap-locking head. Also included in the tool, among various other subassemblies, is a tensioning mechanism which has a rotary driven gripper gear member for developing a desired tension in the cable tie. Disposed about the circumferential edges of the cylindrical shaped gear member are a plurality of radially extending teeth. A recessed portion is located between the two parallel rows of teeth.
REFERENCES:
patent: 2638314 (1953-05-01), McFerren et al.
patent: 3327619 (1967-06-01), Sellman
patent: 3660869 (1972-05-01), Caveney et al.
patent: 3946769 (1976-03-01), Caveney et al.
patent: 4498506 (1985-02-01), Moody et al.
patent: 5205328 (1993-04-01), Johnson et al.
patent: 5595220 (1997-01-01), Leban et al.
Larson Lowell A.
McCann Robert A.
Panduit Corp.
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