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US 4,377,955 AGranted
Screw spanner or wrench
AssigneePaul-Heinz Wagner
InventorJohann Muller
Life of this patent
Estimating the term…
Abstract
A wrench having a handle with an actuating lever arm pivoted for operation to rotate a nut engaging ring geometrically configured to accept a nut or bolt head. The nut engaging ring includes two tappets extending in the plane of rotation of the lever arm. A torque applied to the lever arm engages these tappets and thereby causes the nut engaging ring to rotate with increased force.
Claims22
A wrench for use with a geometrically configured nut or bolt head comprising:
- a generally planar elongated support member,
- a ring member having a recess geometrically configured to receive said nut or bolt head, said ring member being pivotally mounted to said support member about a first pivot axis that is coaxial with said recess, and
- a lever arm pivotally attached to said support member about a second pivot axis that is parallel to but offset laterally from the first pivot axis by a first distance, said lever arm including at least one engagement means,
- said ring member having at least one extension integral therewith and extending in the plane of said lever arm to form an engagement surface for the engagement means on said lever arm, the distance between said first pivot axis and the point of engagement between said extension and said lever arm being greater than said first distance.
1 more element
A wrench for use with a geometrically configured nut or bolt head comprising:
- a generally planar elongated support member,
- a ring member having a recess geometrically configured to receive said nut or bolt head, said ring member being pivotally connected to said support member at a first pivot point, the pivotal axis of such connection being coaxial with said recess, and
- a lever arm pivotally connected to said support member at a second pivot point, the pivotal axis of said second pivot being parallel to but offset laterally from the first pivot point;
- said ring member having at least one extension integral therewith and extending in the plane of said lever arm to form a support point for said lever arm,
- wherein the distance between said support point and said first pivot point is greater than the distance between said second pivot point and said first pivot point,
- whereby a torque applied to said lever arm will cause said ring to rotate.
3 more elements
Dependencies are inferred from the claim text.