Presses – Binding – Binder applying
Patent
1982-11-03
1985-04-02
Wilhite, Billy J.
Presses
Binding
Binder applying
100 31, 140119, B65B 1328
Patent
active
045080305
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a device for twisting together the two ends of a metal binding wire.
Many devices for this purpose are already known. The state of the art in this area may be illustrated by the following patents: DE No. 1 511 828--U.S. Pat. No. 3,470,813--U.S. Pat. No. 4,252,157--FR No. 1 576 602.
With most of the known devices, the loads on the two ends of the binding wire during twisting are different, with the result that the twist is asymmetrical and the strength is reduced. Also, these devices comprise clamps for holding the ends of the binding wire disposed on the opposite side of the twist to the object which is bound, so that forming the twist often results in stretching of the wire, which may be excessive and result in constriction and further reduction in strength.
Also, as the wire ends are held in the clamps, it is necessary to bend them down against the object which has been bound after forming the twist.
Finally, the binding wire is necessarily longer than the length strictly required for forming the twist itself.
A principal objective of the invention is to provide a device for twisting together the two ends of a metal binding wire without further stretching same, using only the length of wire strictly required, and eliminating any necessity to bend down the ends of the twisted wire or the twist itself.
In a device for twisting together the two ends of a wire binding an object, comprising a grooved wire guide having a fixed part containing a rotatable twisting head having two oppositely-disposed inclined passages communicating with a lateral surface of the head and aligned with the groove when the head is in a stopped position, in accordance with the invention two oppositely-disposed clamps are adapted to immobilize respective wire ends in the wire guide close to the head and the head has a central recess open in the direction towards the inside of the wire guide and into which the oppositely-disposed passages open, the central recess having an internal configuration appropriate to the twist to be effected.
An abutment member is disposed opposite the external opening of one passage and cutting means are disposed symmetrically thereto in correspondence with the external opening of the opposite passage.
The lengths of said passages are preferably such that the wire is cut to the exact length required to form the twist.
In one embodiment of the invention, the cutting means comprise a fixed part of the wire guide in which is formed a wire guide channel in alignment with the corresponding passage, and each clamp is respectively constituted by the fixed part of the wire guide and a movable jaw adapted to immobilize the wire in the groove of the wire guide.
In a preferred embodiment of the invention, the central recess is generally cylindrical with a flat transverse base surface and has a diameter equal to that of the twist to be formed and a depth equal to the length of the twist to be formed; the inclined passages are widened in the direction towards the wire guide before reaching the central recess by virtue of internal recesses which permit the ends of the wire to lie in a transverse plane when they are urged against the flat transverse base surface; and the central recess is widened on the side corresponding to each passage and in the direction opposite to the direction of rotation of the head by a lateral recess having a base which is directed upwardly from the flat transverse base surface towards the wire guide so as to push back each end of the wire in such a way as to twist it in the opposite direction.
A preferred embodiment of the invention will now be described by way of non-limiting example and with reference to the accompanying drawings, in which:
FIG. 1 is a view of the twisting device in accordance with the invention, in cross-section on the line I--I in FIG. 2,
FIG. 2 is a view along the axis of the twisting head, in the direction of arrow B in FIG. 1, the clamps not being shown,
FIGS. 3a and 3b show the position of the wire after the twisting member has rotated through appr
REFERENCES:
patent: 2346209 (1944-04-01), De Wald
patent: 3470813 (1969-10-01), Nomm
patent: 3557684 (1971-01-01), Glasson
patent: 3929063 (1975-12-01), Stromberg et al.
patent: 4252157 (1981-02-01), Ohnishi
patent: 4301720 (1981-11-01), Elineau
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