Fixing device
A fixing device includes a base with a limiting groove and a guide path, a sleeve inserted into the through hole of the base and having a flange clamped in the limiting groove, a limiting ring portion passed to the outside, an accommodation space, a through hole at the limiting ring portion, a sliding path on the limiting ring portion and a clamping groove recessed on one the sliding path, a shaft with a clamping rod and a connecting portion, and a wrench placed outside the sleeve and against the guide path and having stop ribs for sliding in and out of the clamping groove along the sliding path, a locating block for assembly of the connecting portion of the shaft, a driving path against the guide path and pushing surfaces aligned with the stop ribs to easily identify the purpose of the rotational displacement of the wrench.
1 . A fixing device, comprising: a base, a sleeve, a shaft and a wrench, wherein
said base comprises a penetrable through hole inside, a limiting groove with an enlarged aperture provided on one side of said through hole, and a continuous undulating guide path provided on an edge of an opposite side of said base relative to said limiting groove;
said sleeve comprises a sleeve body movably through said through hole of said base, a flange located on one side of said sleeve body and clamped in said limiting groove, a limiting ring portion located on an opposite side of said sleeve body relative to said flange and passed through the outside of said base, a penetrable accommodation space provided inside said sleeve, a through hole with a reduced aperture located at said limiting ring portion on one side of said accommodation space, a sliding path with a tapering outer diameter provided on an outer ring surface of said limiting ring portion, and a clamping groove recessed on one side of said sliding path;
said shaft is movably disposed in said accommodation space of said sleeve, a clamping rod provided on one side of said shaft is capable of retractably moving in and out of said accommodation space, a connecting portion provided on an opposite side thereof goes out of said accommodation space and said through hole, an elastic member is mounted around said shaft with one side thereof resisting said clamping rod;
said wrench is mounted outside said sleeve and against said continuous undulating guide path of said base, said wrench comprising a receiving space inside, two opposing stop ribs provided on the inner wall of said receiving space rotate and slide along said sliding path outside said limiting ring portion of said sleeve to allow entry and exit of said clamping groove, a locating block provided on one side of said receiving space for assembly and positioning of said connecting portion of one side of said shaft, a driving path provided on an outer edge of an opposite side of said receiving space to movably resist said continuous undulating guide path of said base, two pushing surfaces respectively provided on said driving path corresponding to the outside of said stop ribs.
2 . The fixing device as claimed in claim 1 , wherein said continuous undulating guide path of said base is U-shaped, said continuous undulating guide path of said base comprising a supporting surface located at each of two relatively high points and a positioning portion located at each of two relatively low points; said driving path on the outer edge of said opposite side of said wrench is also U-shaped and continuously undulating, said driving path comprising two pushing surfaces diametrically opposed to one another and two receiving portions respectively aligned and fitted to said two positioning portions and said two supporting surfaces, so that said two pushing surfaces and said two receiving portions are capable of rotational displacement along said two supporting surfaces and said two positioning portions of said continuous undulating guide path of said base respectively.
3 . The fixing device as claimed in claim 1 , wherein said base further comprises a straight blocking edge provided on one side of said limiting groove on one side of said through hole; said sleeve further comprises a resisting cutting edge located on one side of said flange and aligned and abutted against said straight blocking edge.
4 . The fixing device as claimed in claim 1 , wherein said sleeve is provided with said flange with an enlarged outer diameter on one side of said sleeve body, and said limiting ring portion with an outer diameter smaller than the outer diameter of said flange on an opposite side of said sleeve body; said clamping groove is a straight groove located in the side of said limiting ring portion; the outer diameter of said limiting ring portion at said low part of said clamping groove extends in a gradual increasing ring shape to an outer edge of said high part on an opposite side of said clamping groove to form said sliding path, so that said stop ribs of said wrench are capable of sliding into said clamping groove along said low part of the outer diameter of said limiting ring portion, and then being blocked and limited by said high part on the opposite side of said clamping groove.
5 . The fixing device as claimed in claim 1 , wherein said clamping rod has a diameter larger than said shaft and further comprises a shoulder formed between said shaft and said clamping rod for one side of said elastic member to resist said shoulder, and said connecting portion on an opposite side of said shaft is assembled to said locating block of one side of said receiving space of said wrench selectively by means of tight fit, interference fit, adhesive bonding or welding; said locating block is provided with a fixing hole for alignment and assembly of said connecting portion.
6 . The fixing device as claimed in claim 1 , wherein said stop ribs protrude from an inside surface defining said receiving space are arc-shaped in cross-section, said stop ribs correspond to said pushing surfaces on one side of said driving path; said wrench further comprises a trapezoid-shaped twisting portion protruding from the outside thereof relative to said stop ribs and said pushing surfaces.
7 . The fixing device as claimed in claim 1 , wherein said wrench further comprises a mounting hole on one side of said receiving space for assembly and positioning of said locating block.