Buckles – buttons – clasps – etc. – Bale and package ties – hose clamps – With tighteners
Patent
1998-08-05
1999-11-23
Brittain, James R.
Buckles, buttons, clasps, etc.
Bale and package ties, hose clamps
With tighteners
24279, F16L 3308, B65D 6300
Patent
active
059877138
DESCRIPTION:
BRIEF SUMMARY
The subject of the present invention relates to improvements made in the construction of metal clips or clamps with tightening screw for securing them.
This type of clip is known at present, the clips being essentially constituted by a metal strip having permanently joined to one of its ends a tunnel-like body to house the screw.
The metal strip constituting the clip has near the opposite end to that described a multiplicity of transverse, inclined slots, parallel to one another, which do not reach the edges of the longitudinal sides of the strip and act as the teeth of a rack.
Such clips are assembled by coiling the metal strip onto itself, forming a loop, and the free end of the strip is inserted into the space existing between the open base of the body of the tunnel and the surface of the end to which the tunnel carrying the tightening screw is permanently joined.
By means of this insertion, the helical threads of the screw, projecting through the open base of the tunnel, mesh rotationally in the inclined transverse slots, parallel to one another, of the inserted free end of the strip, and on turning the screw in its tightening movement they push the intermediate walls between two slots and thus the end of the strip is pulled or pushed, depending on the direction in which the screw is turned, and by this means the constriction or loosening of the loop is effected.
The separation between juxtaposed slots of the free end of the metal strip coincides with the pitch of the screw threads of the screw.
Near the lower edges of the major sides of the sheet from which the tunnel carrying the screw is formed there are two longitudinal slots parallel to the said edges for the purpose of narrowing at the said point the amplitude of the separation existing between the descending walls of the tunnel, bringing them closer to the body of the screw, and also in order to provide greater resistance to negative warping thereof.
The head of the screw inserted inside the tunnel body is arranged on the outside of the inner chamber which the latter forms for housing the body of the tunnel screw, the said head bearing against the forward edge of the fixing transverse member placed on the inlet opening of the said chamber.
The fixing transverse member is constituted by two limbs sharply bent in a direction towards each other and their free faces are opposed, touching each other.
These bent limbs start perpendicularly from the minor lateral ends of the stamped metal strip which forms the tunnel body for housing the tightening screw, and they are then sharply bent.
In order to achieve the above-mentioned advance of the free end of the metal strap of the clip, it is necessary to apply the couple of force to the head of the screw, located outside the housing chamber, in a clockwise direction, so that the rear surface of the said head presses firmly against the edge of the fixing transverse member of the screw housing, and at the same time entrains, with its helical screw threads, the end of the metal strip.
With the strong transverse pressure of the rear part of the outer head of the screw which has its body housed inside the chamber during the tightening phase, it often occurs that the ends of the transverse limbs, sharply bent towards each other, which constitute the fixing transverse member, are forcibly displaced laterally, which is detrimental to the proper functioning of the device.
It is a consequence of its narrowness that it offers insufficient resistance to the strong perpendicular thrust of the rear part of the head of the screw.
The negative lateral displacement of the ends of the bent limbs prevents the correct rotational coaxial sliding of the screw as it moves forwards or backwards, resulting in lateral deviation of the screw from the coaxial line of its housing, and as a consequence of this all the force of the load applied against the fixing transverse member is converted into an asymmetrical force, and therefore there arises the negative deviation from the parallel of the body of the screw in relation to the inner
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Brittain James R.
Mikalor, S.A.
Sandy Robert J.
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