Disengagement resistant telescoping assembly and unidirectional method of assembly for such
First Claim
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1. A method of assembling a telescoping screw comprising:
- sliding a leading end of an inner rod through a rear end of a mid rod,threading an external thread of the inner rod with an internal thread proximate a leading end of the mid rod;
sliding the leading end of said mid rod into a rear end of an outer rod,threading an external thread of the mid rod with an internal thread proximate, a leading end of the outer rod, such that said leading end of said inner rod is accessible from the leading end of said outer rod, andfastening a first end cap onto said leading end of said inner rod,wherein the inner rod includes a rear flange at the rear end thereof slidable through a portion of the mid rod and being wider than the internal thread of the mid-rod, thereby being prevented from further advancement upon direct contact therewith, and the mid-rod includes a rear flange at the rear end thereof slidable through a portion of the outer rod and being wider than the internal thread of the outer rod, thereby being prevented from further advancement upon direct contact therewith.
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Abstract
Extension rods of a telescoping assembly (TSA) may be assembled in a single direction. The rods may optionally be threaded together from a reverse extended configuration. The rods may optionally resist disattachement during extension. The inner rod may optionally included a leading fastener and/or the outer rod may optionally include a rear fastener. Each rod may optionally be molded as a single piece. End caps may optionally be added to the TSA after extension of the rods. An end cap may optionally include a rotation stopper. In some embodiments the TSA may include a supporting shoulder.
549 Citations
26 Claims
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1. A method of assembling a telescoping screw comprising:
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sliding a leading end of an inner rod through a rear end of a mid rod, threading an external thread of the inner rod with an internal thread proximate a leading end of the mid rod; sliding the leading end of said mid rod into a rear end of an outer rod, threading an external thread of the mid rod with an internal thread proximate, a leading end of the outer rod, such that said leading end of said inner rod is accessible from the leading end of said outer rod, and fastening a first end cap onto said leading end of said inner rod, wherein the inner rod includes a rear flange at the rear end thereof slidable through a portion of the mid rod and being wider than the internal thread of the mid-rod, thereby being prevented from further advancement upon direct contact therewith, and the mid-rod includes a rear flange at the rear end thereof slidable through a portion of the outer rod and being wider than the internal thread of the outer rod, thereby being prevented from further advancement upon direct contact therewith. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A telescoping assembly comprising:
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an outer rod including a rear fastener and an internal thread proximate a leading end thereof; a middle rod including an external thread fitting said internal thread of said outer rod, a rear flange slidable through a portion of the outer rod and being wider than said internal thread of said outer rod and an internal thread proximate a leading end thereof; an inner rod including, an external thread fitting said internal thread of said middle rod and a rear flange slidable through a portion of the middle rod and being wider than said internal thread of said middle rod; a first end cap including a matching fastener for fastening to said rear fasterner; and a stopper for preventing dethreading of telescoping assembly, said stopper including an interference element on said first end cap for preventing rotation in a contracting direction of said inner rod with respect to said first end cap. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A telescoping assembly comprising:
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an outer rod including a rear fastener and a leading internal thread; a middle rod including an external thread fitting said internal thread of said outer rod, a rear protrusion wider than said internal thread of said outer rod and a leading internal thread; and an inner rod including, an external thread fitting said internal thread of said middle rod, a rear protrusion wider than said internal thread of said middle rod and a leading fastener; an end cap including a matching fastener for fastening to said leading fastener; and a stopper for preventing dethreading of telescoping assembly, said stopper including an interference element on said end cap for preventing rotation in a contracting direction of said outer rod with respect to said end cap.
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Specification