Work holders – Relatively movable jaws – Means to actuate jaw
Patent
1993-01-08
1993-08-10
Watson, Robert C.
Work holders
Relatively movable jaws
Means to actuate jaw
269236, 269904, 2492191, B25B 108
Patent
active
052342069
ABSTRACT:
A clamping apparatus of construction molding board has a base, a base body, a press bar, and a torsion spring. The base is provided with a through hole. The base body of U-shaped construction is made integrally with the base such that the base body extends upwards from the base. The base body contains a receiving space having a rear portion provided with a canal in communication with the through hole of the base. The press bar has a bottom end provided thereon with a serrated arresting portion. The press bar is mounted pivotally in the receiving space by a shaft pin in such a manner that the arresting portion is opposite in location to the canal. The torsion spring is composed of two ring bodies sharing a common end which forms a pressing portion of an inverted U shape. The two ring bodies are provided respectively with another end which forms a supporting portion. The torsion spring is mounted in the receiving space such that the two ring bodies are fitted over the shaft pin, and that the pressing portion embraces the press bar, and further that the two supporting portions are sustained at a predetermined location.
REFERENCES:
patent: 2672839 (1954-03-01), Neuhaus
patent: 2964294 (1960-12-01), Imonetti
patent: 3202419 (1965-08-01), Nansel
patent: 4726560 (1988-02-01), Dotson
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