Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1985-08-21
1987-06-09
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Machine
B25B 1306
Patent
active
046711422
ABSTRACT:
A fluid-operated wrench has a support, a ratchet gear turnably mounted on the support, a pair of driving pawls respectively having free ends engagable with the teeth of the ratchet gear, a drive with a driving element reciprocable along a forward and reverse stroke, a transmission between the driving element and the driving pawls and formed so that during the forward stroke one of the pawls turns the ratchet gear in one direction and during the rearward stroke the other of the pawls turns the ratchet gear in the same direction, wherein the transmission includes a driving arm, and the driving pawls are pivotally connected to the driving arm and at the same time guided in elongated curved slots formed as arcs of two circumferences which are described by two different radii with a center on the axis of the ratchet gear. The wrench has a housing accommodating the drive and also having an inner space in which the support together with the other element can be releasably insertable.
REFERENCES:
patent: 4336727 (1982-06-01), Junkers
patent: 4409865 (1983-10-01), Krautter et al.
patent: 4429597 (1984-02-01), Grabovac et al.
patent: 4458563 (1984-07-01), Bickford et al.
Schmidt Frederick R.
Striker Michael J.
Vaught Bradley I.
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