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Metal Working

Bolt-tightening-tool

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Bolt tightening tool

Details

Inventors: Fushiya, Fusao;
Assignee: Makita Electric Works, Ltd. (Anjo, JP)
Primary Examiner: Smith; James G.
Assistant Examiner:
Attorney, Agent or Firm: Dennison, Meserole Pollack & Scheiner

A bolt tightening tool for tightening a nut onto a bolt which comprises an outer sleeve having a nut receiving bore and an engaging groove; an inner sleeve axially movably mounted within the outer sleeve and having a tip receiving bore; and a stopper tiltably disposed in the inner sleeve. The stopper has one end projectable into the tip receiving bore of the inner sleeve and the other end projectable into the engaging groove of the outer sleeve. When a tip is fitted into the tip receiving bore, the tip pushes the stopper to tiltingly move the latter away from the engaging groove, permitting the inner sleeve to retract axially and rendering a nut fittable in the nut receiving bore of the outer sleeve.

DETAILED DESCRIPTION It is, accordingly, an object of the present invention to provide a bolt tightening tool which may ensure proper fitting of a nut and a tip of a bolt into an outer sleeve and an inner sleeve, respectively, so as to tighten the nut onto the bolt properly and improve the safety of operation.
It is another object of the present invention to provide a bolt tightening tool including means for preventing incomplete fitting of a tip of a bolt which includes a minimum of components, and which is easy to assemble and relatively inexpensive to manufacture.
According to the present invention, there is provided a bolt tightening tool for tightening a nut onto a bolt, of the type driven by an electric motor.
The bolt tightening tool includes an outer sleeve rotatably coupled to the electric motor and an inner sleeve mounted within the outer sleeve for axial movement relative thereto.
The outer sleeve has a nut receiving bore for fitting therein a nut to be tightened and has an engaging groove of a predetermined width formed adjacent the nut receiving bore.
The inner sleeve has a tip receiving bore for fitting therein a tip of a bolt to be sheared.
The inner sleeve also has an axial recess formed in the outer periphery of the forward end thereof in generally opposed relation to the engaging groove of the outer sleeve, and an aperture formed in the forward end of the recess and communicating with the tip receiving bore.
A stopper is tiltably mounted within the axial recess of the inner sleeve.
The stopper has a base portion projectable into the tip receiving bore of the inner sleeve and an engaging portion projectable into the engaging groove of the outer sleeve.
The inner sleeve has on the outer periphery thereof biasing means for normally urging the base portion to project into the tip receiving bore and for normally urging the engaging portion to project into the engaging groove.
When a nut is to be tightened onto a bolt, the tip receiving bore of the inner sleeve is fitted to the tip of the bolt

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