Buckles – buttons – clasps – etc. – Cord and rope holders – Sliding part or wedge
Reexamination Certificate
2000-01-14
2001-09-04
Brittain, James R. (Department: 3626)
Buckles, buttons, clasps, etc.
Cord and rope holders
Sliding part or wedge
C024S1320AA
Reexamination Certificate
active
06282759
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an automatic cable clamping vice e.g. of steel or another material depending on the classifying part of claim
1
.
Numerous vices designed to grasp a cable by friction are known.
Essentially vices exerting for example through bolts a constant pressure on the cable and vices with automatic operation in which tightening is related to cable traction which is converted by mechanisms for example wedge-like or with lever in a pressure on the cable are distinguished. Because of the considerable forces due to coupling and friction the mechanisms used heretofore in automatic operation vices were relatively complicated and heavy. Conceptually the tightening can be provided with a system closed around the cable or a system open on the side. In the case of the closed system the stress is relatively favorable because the tightening forces are transmitted symmetrically by the upper tightening member to the lower one but on the other hand there arises the problem that the cable must be threaded by a free end into the closed system which is a requirement limiting use.
In side opening system the cable can be inserted at any point creating however a strong bending moment in the side connection between the tightening members and then having to make use of heavier structures.
Another disadvantage of numerous automatic operation vices is that once the vice is tightened it cannot be opened easily and especially at high traction values when opening even requires hammer blows.
The purpose of the present invention is to remedy the above mentioned shortcomings of the prior art by making available a vice which would have a considerably lighter structure, would have the highest operating safety and be easy to remove after use.
This purpose is achieved by the invention of a vice with characteristics in accordance with the characterizing part of claim
1
.
SUMMARY OF THE INVENTION
The present invention thus concerns an automatic vice providing a tightening unit closed during operation but rapidly openable for insertion or removal of the cable from the side i.e. with no need of inserting the cable end. The vice in accordance with the present invention also permits easy removal of the cable even after strong tightening.
The vice in accordance with the present invention virtually provides two tightening members connected to each other laterally through a hinge operation system. To insert the cable the tightening system can be opened by simply pulling the pin out of one of the hinges and rotating one tightening member with respect to the other.
Tightening after insertion and tensioning of the cable takes place due to the fact that the hinge axis has an inclination &agr; with respect to the cable axis and that the hinges, in addition to rotary motion, also permit a certain longitudinal shifting of one tightening member with respect to the other.
Longitudinal shifting of a tightening member with respect to the other caused by the cable traction given the inclination &agr; of the hinge also causes a closing of the tightening members and therewith tightening of the interposed cable.
REFERENCES:
patent: 1114235 (1914-10-01), De Carteret
patent: 1159616 (1915-11-01), Swisher
patent: 1507316 (1924-09-01), Kemper et al.
patent: 1564382 (1925-12-01), Treiman
patent: 1607332 (1926-11-01), Adams
patent: 1903148 (1933-03-01), Swisher
patent: 1945000 (1934-01-01), Sharar
patent: 2077386 (1937-04-01), Bairley
patent: 2700808 (1955-02-01), Wells
patent: 2849772 (1958-09-01), Bukowski
patent: 3470528 (1969-09-01), Farrington Jr. et al.
patent: 4428100 (1984-01-01), Apperson
patent: 4600264 (1986-07-01), Counsel
Brittain James R.
Shlesinger Fitzsimmons & Shlesinger
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