Wireworking – Joining wire – Implements
Patent
1989-02-17
1990-07-17
Larson, Lowell A.
Wireworking
Joining wire
Implements
140 57, B21F 1504
Patent
active
049415158
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a lashing machine for lashing together mutually crossing elongated members with the aid of U-shaped wire ties, and particularly, although not exclusively, for lashing together concrete reinforcement rods, said machine including a tie magazine, means for dispensing the ties singly from the magazine in a manner such that each tie is caused to engage over two mutually intersecting elongated members at their point of intersection, and a lashing head for receiving, holding and twisting together the limbs of respective U-shaped ties.
Reinforcement rods, bars, etc., are traditionally lashed together to form tied mesh reinforcements, with the aid of simple, manually manipulated tools. This method is extremely time consuming, and therewith expensive. The work involved is also laborious and is highly likely to result in, inter alia, wear damage. This is due to the fact that when lashing together concrete reinforcement rods, tied mesh reinforcements for concrete slabs, concrete floor structures, vault structures, and like structures, with the aid of present day tools, the workman concerned is required to stoop for considerable lengths of time, resulting in considerable strain on the spine.
When lashing reinforcement rods, the wire ties are normally placed manually around the rods at the various cross-over points thereof and the ends of the ties twisted or twined together with the aid of pliers or like tools, so that the reinforcement rods are firmly held together. Conventional lashing methods of this kind are also extremely hazardous, particularly when working on roof structures, bridges and the like, due to the fact that the workman concerned must adopt a stooping position, which inter alia increases the risk of accidents. Furthermore, when practising conventional lashing methods, the ends of the wire ties are twisted together on the upper side of the tied mesh reinforcement, therewith forming sharp, upstanding points which are also liable to result in injury to those workmen concerned with the construction work.
The present invention is based on the realization that the work of lashing together reinforcement rods could be made more effective and the aforesaid injury hazards eliminated, or greatly reduced, if access could be had to an automatically operating lashing or tying machine so constructed as to enable the workman to stand upright during a lashing operation and such as to enable the ends of the wire ties to be twisted together on the underside of the reinforcement rods or tied mesh reinforcement.
An automatic lashing or tying machine is known to the art from DE-A-1 1 434 519. This known machine, however, is a hand-operated machine which requires the workman to adopt a stooping position when working on vault structures and the like. The known machine also exhibits other serious disadvantages. For example, the magazine holding the U-shaped wire ties is located at a constant distance above a lashing head, which, inter alia, prevents the reinforcement rods from being pressed against one another in conjunction with a lashing operation. A further disadvantage with the known machine is that the wire ties must be displaced from the magazine to a relatively large extent before reaching their final position of engagement with the reinforcement rods to be lashed.
In addition, the lashing head of the known machine is relatively complicated, since it includes two axially and relatively moveable parts between which the ends of the wire ties are held. The outer part of these axially displaceable parts is intended to be drawn upwardly by respective lashing ties during a lashing operation, while the inner part of the head is pressed downwardly at the end of the lashing operation. When lashing of the reinforcement rods is completed and the ends of the wire ties have been released from the head, the outer part of the lashing head is intended to move downwards at the same time as the inner part moves upwards. Due to the small tolerances and clearances permitted, the mechanism is highly susceptib
REFERENCES:
patent: 3026915 (1962-03-01), Jones et al.
patent: 3169559 (1965-02-01), Working, Jr.
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