Patent ID: 7681429
Filing Date: 2010-03-23
Classification: B21J,Y10T

Abstract:
1. A rivet fixing device, comprising: an inner guide sleeve which has a tubular body having an end section provided with threads adapted to threadedly couple to an electrically-operated or battery-powered electric drill or power screwdriver, said tubular body being provided at an inside surface with an internal bulging chamber and having symmetrical open-end slits; a catch tab retainer tube having a spring chamber in an end thereof, external threads being formed on an external wall surface of the spring chamber, the catch tab retainer tube having a ring fixed by two fixing lugs and symmetric circular openings in an end section thereof for respectively receiving therein two catch tabs, wherein the catch tabs are curved and have a lower section forming threaded teeth; a pawl compartment threadedly coupled to the catch tab retainer tube and having a conical end section, the pawl compartment having an interior space receiving two pawls; an outer guide sleeve fitted over said inner guide sleeve and threadedly engaged with said inner guide sleeve; a return spring fitted in the outer guide sleeve; an expander having a conical end section and fit in a spring positioned in the spring chamber of the catch tab retainer tube; a driver having a tubular body receiving the pawl compartment therein, said driver having an threaded end projecting beyond the outer sleeve to threadedly engage with a driving positioning cap, the expander having symmetric open-end slits for slidingly receiving the fixing lugs of the catch tab retainer tube; a rivet breaker threadedly secured to the driving positioning cap and having a holding hole; wherein the rivet fixing device is used for receiving insertion of a rivet having a shank section in such a way that the shank section is located on an end of the rivet breaker, the rivet being then allowed to fit through holes defined in two plates to be riveted together, depressing the driver inward allowing the catch tabs of the catch tabs retainer tube to engage a spindle of the electric drill or the power screwdriver, so that operation of the electric drill or the power screwdriver causes the spindle of the electric drill or the power screwdriver to drive the catch tabs of the catch tab retainer tube for moving the catch tab retainer tube inwardly, thereby squeezing and deforming a fit end of the rivet fit in the holes of the plates by the rearward movement of the catch tab retainer tube to form an expanded portion that stretches and fixes the rivet between the two plates, and wherein with the inward movement, the catch tab retainer tube is moved into the bulging chamber of the inner guide sleeve, the catch tabs within the circular openings being thus allowed to outward bulge and the catch tab retainer tube being allowed to return to an original condition, and the rivet being broken by the rivet breaker.