Wire twisting apparatus |
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申请号 | US13137500 | 申请日 | 2011-08-22 | 公开(公告)号 | US09297162B2 | 公开(公告)日 | 2016-03-29 |
申请人 | Guy Chouinard; | 发明人 | Guy Chouinard; | ||||
摘要 | A rotating arbor has a hollow interior and a forward end provided with a number of fingers which are spaced apart from adjacent fingers by longitudinally extending slits. The hollow interior and the slits are dimensioned such that a conventional concrete pin may be inserted into the arbor and be rotated by it. In one version of the apparatus, three rollers are situated side by side and a space separates each roller from an adjacent roller. A length of wire is positioned such that one of its segments extends through one space and extends to and through the aperture in the head of the concrete pin. A second segment of the wire doubles back from the concrete pin to and through the second space. As the arbor rotates, the segments of the wire twist around each other to attach them to the pin. In another version of the apparatus, the segments the wire are received in grooves formed in two blocks, one stationary and the other pivotal. As the concrete pin rotates, the pivotal block pivots to facilitate twisting of the wire segment in the pivotal block around the other wire segment. | ||||||
权利要求 | I claim: |
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说明书全文 | This application claims priority pursuant to 35 U.S.C. 119 of Canadian patent application No. 2,716,309, filed Oct. 4, 2010, the entire contents of which are herein incorporated by reference. This invention relates to an apparatus used in the assembly of drop ceilings and more particularly to an apparatus for attaching a concrete pin to a wire as part of the process of suspending a drop ceiling beneath an existing ceiling. In buildings composed of concrete walls and concrete slabs forming the floors and ceilings of rooms, it is customary to suspend drop ceilings from the existing ceiling in the rooms. The drop ceilings not only conceal the unattractive concrete surfaces of the existing ceilings but also provide a space between the existing ceilings and the drop ceilings for pipes, electrical wires, pot lights and the like. The steps usually followed for suspending drop ceilings from existing ceilings of concrete are first to drive concrete pins into the existing ceilings leaving the heads of the pins exposed. A wire is then cut into a number of pieces of predetermined length and each length is passed through an aperture in the head of a concrete pin. Segments of the lengths of wire outside the aperture are then twisted around each other to attach them to the concrete pins and finally, the lengths of wire are fastened to the framework of the drop ceiling to hold it in place. The wire used for this purpose must be strong enough to bear the weight of the drop ceiling and it must also be relatively inflexible to prevent the ceiling from shifting once it is installed. Because of the wire's very limited flexibility, considerable force is required to twist it and because of this, the process of twisting lengths of wire is very time consuming. For persons engaged in doing so, the process is very onerous. I have invented an apparatus for twisting lengths of wire that is easy to operate, carries out the twisting operation quickly and, being an apparatus as opposed to a human being, does not tire over time. Briefly the apparatus of my invention includes: an arbor mounted to be rotated by a such means as an electric drill. The arbor has a longitudinal axis, a longitudinally extending passageway concentric with the axis, and a forward end having at least two fingers, each being spaced apart from an adjacent finger by a longitudinally extending slit which is diametrically opposite another slit. The passageway and the slits are dimensioned such that the pin may be inserted into the arbor in such a way that the shaft is within the passageway and portions of the head are confined within diametrically opposed slits in the arbor in order for the concrete pin and the arbor rotate together as a unit. The apparatus includes a wire locating assembly having at least one space dimensioned to loosely receive a length of wire which extends through the space such that the length of wire advances through the space toward the arbor as the wire is twisted. The apparatus of the invention is described below with reference to the accompanying drawings in which: With reference to With reference to Two wire positioning blocks 40 and 42 are mounted is mounted on the base plate on either side of the handle. Block 40 has a longitudinally extending groove 40a on its upper wall while block 42 has a depression 42a on its upper surface. The depression serves as a guideway for the handle in its lowermost inoperative position as illustrated in With reference to The operation of the wire bending assembly is described with reference to With reference to With reference to With reference again to The first guide block 60 is fixed permanently to the base plate and is positioned such that its groove directs a first segment 48a of the length of wire within the groove so that the longitudinal axis of the length is substantially an extension of the longitudinal axis 14a-14a of the arbor. With reference to It will be understood that the locking pin does not interfere with horizontal movement of the wire segment in the groove during the twisting operation but prevents the segment from bending upward or separating from the groove during this time. With reference again to A spring 70 biases the stationary guide block into the starting position. However as the arbor revolves counterclockwise, segment 48b of the length of wire within the groove overcomes the bias of the spring and causes the guide block to pivot counterclockwise as illustrated in To summarize, in the starting position groove or opening 62a directs wire within the groove toward the arbor but as the block pivots toward the final position, the groove directs the wire an increasing distance from the arbor. As it does so segment 48b of the length of wire wraps itself around segment 48a and increasing distance from the bend in the length of wire. With reference to The wire locating assembly of The central roller is composed of lower and upper components A,B respectively, of unequal outer diameters, the upper component having a smaller diameter than the lower. The lower component contacts the outer walls of the outer rollers and rotates with them while the upper component does not contact the outer roller. Rather, there are first and second openings 96a,b respectively, between the component and the two outer rollers and those openings are adapted to receive first and second separate segments 98a,b, respectively, of a length of wire. The first and second openings are defined by first and second side walls, i.e. the walls of the rollers. A keeper 100 is pivotally attached to the spindle of outer roller 90a. The keeper has a notch 102 in its outer end for receipt of the spindle of the other outer roller 90b. By means of the keeper, the spaces between adjacent rollers are closed to confine the segments of wire within the spaces 96. In operation, and with reference to The wire is then cut into a length having a length approximately 3-4 half times the distance between an existing concrete ceiling and a drop ceiling in the course of construction. The length of wire is then inserted into the aperture in the concrete pin until the lengths of the two segments of the wire on opposite sides of the aperture are approximately equal. The keeper of the wire locating assembly is then opened to allow one segment of the wire to be positioned in the space between one outer roller and the central roller while the other segment is positioned in the other space The keeper is then closed to confine the segments of wire in the two spaces. The drill is then activated to cause the arbor to rotate and as it rotates, the two segments of the length of wire twist around each other with resulting attachment of the wire to the concrete pin. The concrete pin is then ready to be driven into a concrete ceiling. Once driven in, the wire can be used as a hanger to attach the drop ceiling in place. With reference to Guide 110 is attached to the base plate 122 be means of a pair of spring loaded locking pins 124. The guide block can be advanced toward the arbor or withdrawn from it by means of the locking pins and recesses (not illustrated) in the upper wall of the base plate which receive the locking pins. It will be understood, of course, that modifications can be made in the structure of the apparatus of the invention without departing from the scope and purview of the invention as defined in the appended claims. For example, in |