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Home Metal Working Screw-tool

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Details
Inventors: Lieser, Karl;
Assignee: Wera Werk Hermann Werner GmbH & Co. (Wuppertal, DE)
Primary Examiner: Smith; James G.
Assistant Examiner:
Attorney, Agent or Firm: Farber; Martin A.

A screw tool has a direction-reversible catch including clamping members disposed within wedge-shaped clamping spaces between an outer drive ring part (5) and an inner driven core part (8) of approximately triangular shape in cross section, the clamping members are displaceable by a rotatable switch member which is lockable in its switch positions into release with respect to the wedge walls of the corresponding clamping space by drivers acting on the clamping members and blocking the passage of the clamping members into, in each case one of their two clamping positions, and it proposes, in provide for a structurally simple friction-minimized construction wherein each clamping member lies loosely in a clamping space and is displaceable into its clamping position by the rotation of the drive ring part.

DETAILED DESCRIPTION The object of the present invention is to simplify the construction of a screw tool of the type in question and develop it in such a manner that friction is minimized so as to obtain optimum operating conditions.
This object is achieved by one clamping member each (24, 58) lies loosely in it clamping space and is displaceable into its clamping position by the rotation of the drive ring part (3, 34).
As a result of this development, a screw tool of this type which is of increased value of use is obtained.
The construction of the screw tool is simplified because of the reduced number of parts.
It has been found that three clamping members are sufficient in order to obtain the desired action.
If the switch member and thus the drive means are in a neutral central position then the driven core part is carried along upon the rotation of the drive ring part in each direction, the clamping members being carried along into their clamping position exclusively by the rotation of the drive ring part.
If, on the other hand, driving in one direction and free travel in the other direction are desired, then the switch member must be turned into the corresponding position, in which case the drivers block the access to one clamping corner of the clamping space.
Upon drive along in rotation the clamping members now engage into the corresponding clamping corners.
A turning of the drive ring part in the direction of free travel then leads to the rolling of the clamping members out of said clamping corners.
It has been found that this loose insertion of the clamping members results in a reduction in friction of about 20% as compared with traditional structural shapes so that premature phenomena of fatigue upon lengthy operation of the screw tool are counteracted.
This is of particular importance when the screw tool is developed as a screwdriver.
Barreling of the sides of the triangular driven core part leads to a continuous guiding of the clamping members into the corresponding clamping corners of the clamping spaces


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