Wireworking – Joining wire – Implements
Patent
1987-05-22
1989-01-17
Larson, Lowell A.
Wireworking
Joining wire
Implements
140 57, 140 93A, B21F 1504
Patent
active
047982314
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for connecting at least two rods, wherein an apparatus, which is provided with a rotatable grabbing means, seizes a wire loop, which extends around the rods, and twists the loop during a pulling movement, and to a device for accomplishing the method. Such a method and device are generally used for securing reinforcement steel rods during the production of reinforced concrete structures, the reinforcement steel rods usually lying one above the other in an orthogonal manner and being interconnected at their points of intersection.
A plurality of methods and devices are known for accomplishing the securement of these reinforcement rods, such work often being undertaken by specialists under contract. Since it is necessary to secure a very large number of intersection points, especially in the case of large-scale buildings, a number of apparatus which operate automatically or semi-automatically have been designed and patented, but none of these apparatus have yet been successful on the market, since they are usually too complex or become faulty with rough handling on a building site. For this reason, simple methods and apparatus still exist, which depend mainly on the skill and stamina of the specialist worker. In such a case, prefabricated wire loops are used which have rings or eyelets at their two ends. As a result of the required flexibility and, hence, minimum thickness of the wire, for safety reasons, two of these wire loops are manually placed around the particular rods to be connected, and the four wires of the loops at the top are seized by a twisting apparatus which comprises a rod with a hook, the rod being knurled and extending in a suitable handle so that, when the handle is pulled, the rod and, hence, the hook are set in rotation. This method and apparatus have the advantage of being simple, but the apparatus, which is only formed from two component parts, has the considerable disadvantage that the wire loops have to be inserted beneath the rods to be connected, so that the person carrying out the work has to bend down low if, as is generally the case, the reinforcement rods are on the ground. In addition, the wire loops have to be carried in one hand whilst the apparatus is operated with the other hand. In order to permit as many wire loops as possible to be seized at any one time, the connection points should not occur at the eylets and, as a consequence thereof, it is necessary to weld-on the eyelets instead of twisting them. This means that two wire loops with four welding points are required per working operation, and consequently the production of these wire loops becomes labour-intensive and, as a result, relatively costly.
By comparison, the present invention seeks to provide a method and a device for accomplishing the method, whereby it is easier and quicker for the operator to connect at least two rods, and whereby the material costs for a connection can be reduced. This object is achieved by the method and device described in the claims.
The invention is explained more fully hereinafter with reference to embodiments.
FIG. 1 is a top view of a partially cutaway portion of a first embodiment of the device according to the invention;
FIG. 2 is a longitudinal sectional view of the device of FIG. 1;
FIG. 3 shows an enlarged detail of FIG. 1;
FIG. 4 is a longitudinal sectional view of the enlarged detail of FIG. 3;
FIG. 5 is a sectional view, on an enlarged scale, taken along the line V--V of FIG. 1;
FIG. 6 is a sectional view taken along the line VI--VI of FIG. 3;
FIG. 7 shows a phase during the connecting operation;
FIG. 8 is a top view of an enlarged detail of a second embodiment of the invention;
FIGS. 9 to 12 show a wire clamp of the invention from different sides and in two different working positions;
FIGS. 13a and 13b are plan views of a third, preferred, embodiment without a cover;
FIGS. 14a and 14b are longitudinal sectional views of FIGS. 13a and 13b;
FIGS. 15 to 17 show three different phases of the closing procedure of the third embodimen
REFERENCES:
patent: 261246 (1882-07-01), Moses
patent: 3169559 (1965-02-01), Working
patent: 3810495 (1974-05-01), Pack
Freiburghaus Rene
Glaus Heinrich
Joehr Hans
Lehmann Peter
Larson Lowell A.
Styner & Bienz AG
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