Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1980-04-16
1981-11-03
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 572, B25B 1700
Patent
active
042979226
ABSTRACT:
A jaw support for a power tongs having a rotatable rotor for turning a pipe via a jaw and anvil mounted on the rotor via the jaw support. The jaw support comprises two support plates which sandwich the rotor and support the jaw and anvil. The jaw is actuated by rollers disposed in the rotor and engaged by a portion of the jaw. Engagement between a portion of the jaw and portions of the jaw support limits pivotation of the jaw on the jaw support and the actuation of the jaw via rollers on the roller limits pivotation of the jaw with respect to the rotor so that relative rotation between the jaw support and the rotor is limited at such times that the jaw is mounted on the jaw support. The support plates are dimensioned to overlay holes in the rotor which support roller pins used to mount the rollers in the rotor at such times that the jaw support is within the limited range of relative rotation thereof on the rotor when the jaw is mounted on the jaw support so that the jaw support maintains the roller pins and rollers in the rotor during operation of the tongs. An opening is formed in the support plates and the jaw is removable from the jaw support to permit the opening to be aligned with the roller pins for replacement of rollers in the rotor.
REFERENCES:
patent: 2435972 (1948-02-01), Lundeen
patent: 2650070 (1953-08-01), Lundeen
patent: 2703221 (1955-03-01), Gardner
patent: 2989880 (1961-06-01), Hesser et al.
patent: 3261241 (1966-07-01), Catland
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