Buckles – buttons – clasps – etc. – Bale and package ties – hose clamps – With tighteners
Patent
1993-02-19
1994-06-28
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Bale and package ties, hose clamps
With tighteners
24280, A44B 1100
Patent
active
053235150
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a clamping device for tightening a clamping strip, comprising two working mechanism parts whereof each has an operating end meshing with the other part's operating end, and whereof each has an inner surface abutting against the material about which the mechanism is to be clamped with the mechanism, whereof the first mechanism part in its meshing end section has an inner thread wherein a tightening screw is secured in a lengthwise extendable or retractable manner, and the second mechanism part in its meshing section has an operating part meshing with the tightening screw in such a way that the clamping strip is tightened and loosened when the tightening screw is screwed in through, respectively out through, the inner thread.
It is known a clamping strip equipped with a tightening mechanism of the mentioned type, wherein two mechanism parts at their meshing ends are equipped with a cross-piece extending from the inner section of each mechanism part, and whereof both are equipped with a centre hole through which a common tightening screw is passed and being equipped with a counter-nut at its free threaded part When the screw is screwed into the counter-nut, this will, in engaging action against the one cross-piece, displace this in the direction towards the second cross-piece against which the head of the tightening screw is engaged. Thus the clamping strip is tightened around the material around which it is wanted to clamp the clamping device equipped with the tightening mechanism. A significant disadvantage with this arrangement is that the part of the material being present between the cross-pieces of the mechanism parts vis-a-vis the handle of the tightening screw during the tightening operation, has a tendency to form a local bulge which partly prevents the cross-pieces to be tightened further together and partly causes a local leakage under the bulge, if the material is a hose to be secured about a connecting piece.
It has been attempted to alleviate this drawback by placing between the cross-pieces at their bottom parts a protecting plate secured to one of the cross-pieces to prevent the mentioned bulging. It has, however, been found that such a protecting plate can not prevent the mentioned bulging of the material since the protecting plate itself participates in the bulging if it is produced in the same material thickness and material type as the two mechanism parts.
It is the purpose of the invention to produce a clamping mechanism of the above mentioned kind wherein risk for lokal bulging of the material, around which the clamping strip is to be tightened, is avoided in a simple fashion.
This is achieved with a clamping mechanism being characterized in that the said meshing part on the second mechanism part is formed as a cup with a outer bottom being present in and constituting the end of a strip-shaped part, wherein the first mechanism part close to the inner threads has an opening through which the second strip-shaped section of the mechanism part runs so that the two mechanism parts cross each other via this opening, and that the free threaded end of the tightening screw abuts against the inner surface of the cup when the clamping strip is tightened by rotating the tightening screw through the inner threads. Thus it is completely avoided a lokal bulging at the tightening mechanism of the material about which the clamping strip is to be tightened, and as a consequence thereof it becomes possible to transfer, via the clamping mechanism, far greater tightening forces to the clamping strip than what has previously been possible with similar known clamping mechanisms. As a result of the fact that the meshing part is formed as a cup in the end of the strip-formed part, it is achieved partly that the free threaded end of the screw is kept in place in the interior of the cup, and partly that the shape of the cup gives the end of the strip-shaped part a great stiffness of form so that even greater pressure forces from the free end of the screw may be assimilated in the cup
REFERENCES:
patent: 912097 (1909-02-01), Erickson
patent: 1070952 (1913-08-01), Erickson
patent: 1252323 (1918-01-01), Cooper
patent: 1272541 (1918-07-01), Scott
patent: 1479679 (1924-01-01), Sandholm
patent: 1678915 (1928-07-01), Riddle
patent: 1782476 (1930-01-01), Parker
patent: 3407448 (1968-10-01), Tetzlaff et al.
Exportservice AS
Sakran Victor N.
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