Method and an apparatus for twisting and tightening a wire
OwnerKim M Jensen, Per B Jenseninventors
Life of this patent
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Abstract
A method and apparatus for twisting and tightening a wire with a free end portion around at least two objects, e.g. iron bars for reinforced concrete, for binding the objects together. The method and apparatus enables a tighter and stronger binding to be performed even by means of a portable device and with the use of less binding wire than required by conventional devices.
Claims27
A method for twisting and tightening a wire with a free end portion around at least two objects for binding the objects together, the method comprising:
- arranging the two objects in close contact,
- placing a twisting member in a position next to the objects, the twisting member having a surface facing the objects,
- guiding the free end portion through a hole or groove in the twisting member,
- guiding the free end portion in a path at least one time around the objects, so as to wind a wire portion in at least one loop around the objects,
- guiding the free end portion through or into the twisting member whereby the wire forms a closed loop and defines an intersection of two wire portions, so that said surface of the twisting member is between the intersection and the objects,
- gripping the end of the free end portion of the wire,
- tightening the wire by pulling,
- turning the twisting member, so as to twist the wire, characterised in that the wire is cut by a cutting edge of the twisting member.
An apparatus (1) for twisting and tightening a wire around two objects and comprising:
- a twisting member (9)(44) having a surface (64) facing the objects, the twisting member being mounted in such a way that said surface may contact or be in close contact with the two objects,
- two jaws (7) adapted to encircle the two objects, the jaws being arranged opposite to each other and facing each other in a loop-shaped configuration, each of the jaws having one free end portion and one end pivotally mounted near the twisting member,
- power-driven means (17) for feeding a wire through a first hole (53) in the twisting member and along guiding means (56a,58) In a first one of the two jaws to the free end portion of that jaw and further to the free end portion of the second jaw and therefrom along guiding means (56b,58) in the second jaw and further through a second hole (53) In the twisting member, so as to wind a portion of the wire at least one time around the objects;
- whereby the wire forms a loop and defines an intersection (28) of two wire portions, so that said surface of the twisting member is between the intersection and the objects,
- gripping means (36, 61) for gripping a free end portion of the wire when the wire has been fed around the objects,
- tightening means (29) for tightening the wire when gripped by the gripping means,
- power-driven means (12) for rotating the twisting member, so as to twist two portions of the tightened wire around each other, characterised in that the twisting member defines a cutting edge which is adapted to cut the wire when the twisting member is rotated.
An apparatus according to any of claims 2-4 or 9, wherein the means for rotating the twisting member comprises pneumatically driven means.
An apparatus according to any of claims 2-11, wherein the same electrically driven motor is used for twisting and feeding.
Dependencies are inferred from the claim text.