Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1984-01-18
1986-06-03
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 581, 81 5746, B25B 1346
Patent
active
045922543
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tool for turning a rotatable element.
Throughout this specification, the term "rotatable element" is taken to include nuts, bolts, screws and like fastening elements which are adapted to be fastened or loosened by a turning action.
Screw-type fixing elements such as machine screws, bolts and nuts are generally loosened and fastened by means of a spanner which has a jaw or socket for engaging the fixing element and a handle by means of which the spanner may be turned to effect the turning action of the fixing element. These fixing elements are sometimes located in confined areas in which it is inconvenient, or perhaps not possible, to use a conventional spanner.
It is an object of this invention to provide a tool for turning a rotatable element which tool is not required to be rotated about the axis of rotation of the fixing element.
A number of attempts have been made to produce tools which meet the above criteria. One such tool is described in U.S. Pat. No. 2,690,684 to Batcha. This patent requires a two handed operation with a spiral spring rewinding cord which winds onto a drum. This necessitates the body of the tool having considerable axial width which mitigates its use in a confined space. Further, to obtain increased torque, the drive has to be locked by a plunger arrangement so that no ratchet operation is available.
Broadly the invention resides in a tool for turning a rotatable element comprising a body having a device head and a handle, the drive head includng an engaging member rotatable in one direction and adapted to drivingly engage the rotatable element, a driving member movable between first and second positions, the driving member being operatively coupled to the engaging member whereby movement of the driving member in one direction imparts rotational torque to the engaging member and movement of the driving member in the other direction does not impart rotational torque to the engaging member, said handle including reciprocating means coupled to the driving member.
The present invention also resides in a tool for turning a rotatable element comprising a body having a drive head and a handle, an annular engaging member rotatably mounted in the drive head with its inner face defining a multi-walled socket to receive the rotatable element, an adapter or a drive shaft and with a plurality of ratchet teeth around its outer perimeter, side plates rotatably mounted in the drive head co-axial with the engaging member, means for partially rotating the side plates coupled to an operating member mounted on or incorporated in the handle, spring means to resist the rotation of the side plates, a first pawl mounted on the side plates to engage the ratchet teeth and effect rotation of the engaging member when the side plates are rotated with the operating member and a second pawl mounted on the body to engage the ratchet teeth and prevent rotation of the engaging member as the side plates return to their original position under the action of the spring means.
In another form the invention resides in a tool for turning a rotatable element comprising: a body having a drive head and a handle, the drive head including an engaging member rotatable in one direction and adapted to drivingly engage the rotatable element, a driving member movable between first and second positions, the driving member being operatively coupled to the engaging member whereby movement of the driving member in one direction imparts rotational torque to the engaging member and movement of the driving member in the other direction does not impart rotational torque to the engaging member, said handle including a fixed handle portion and a movable handle portion, the movable handle portion being movable between first and second positions with respect to the fixed handle portion, the movable handle portion being operatively coupled to the driving member whereby movement of the movable handle from the first position to the second position thereof effects rotational movement of the driving member in said one d
REFERENCES:
patent: 1903514 (1933-04-01), Merriman et al.
patent: 2690689 (1954-10-01), Batcha
patent: 2817257 (1957-12-01), Kniser
patent: 3124983 (1964-03-01), Emerzian
patent: 3272037 (1966-09-01), Bruehl
patent: 3572188 (1971-03-01), Christian, Jr.
patent: 3859875 (1975-01-01), Bieganski
patent: 4098151 (1978-07-01), Bliss
patent: 4099430 (1978-07-01), Stodola
patent: 4141262 (1979-02-01), Smith
patent: 4231271 (1980-11-01), Yamada
Meislin Debra S.
Schmidt Frederick R.
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