Claims
- 1. A power tool for fastening objects, comprising a housing provided with a non-rotatable element; a power drive in said housing and provided with a rotatable driving element; and a fastener part including a bolt having a thread and an axis and introducable into parts forming an object, a nut screwable on said bolt and cooperating with said rotatable driving element, and a washer to be applied between said nut and the object and cooperating with said non-rotatable element, said washer having an axis and being provided with a first bearing face surface located at one axial side and adapted to cooperate with said nut, a second bearing face surface located at an opposite axial side and adapted to cooperate with the object, and at least one third turning resistant surface adapted to cooperate with said thread of said bolt, so that when said driving element turns said nut with a given active force in one direction and said washer is held stationarily by a reactive force applied by said non-rotatable element of said housing, only said nut turns to tighten or loosen said bolt, and said washer remains rotation stationary while said bolt elongates or relaxes in an axial direction.
- 2. A power tool as defined in claim 1, wherein said tool part has a turning mechanism, said driving element being formed as a projection which is connected with said turning mechanism and is turned by the latter.
- 3. A power tool as defined in claim 2, wherein said at least one third turning resistant surface is a radially inner surface of said washer which is coaxial with said axis and is provided with bolt thread engaging means.
- 4. A power tool as defined in claim 3, wherein said washer is composed of two washer parts which are arranged radially near one another and include a radially inner washer part and a radially outer washer part, said bolt thread engaging means being provided on said inner washer part, said washer parts being formed so that they are not freely rotatable relative to one another but are axially displacable relative to one another.
- 5. A power tool as defined in claim 3, wherein said bolt thread engaging means has a thread having a different angle than said thread of said bolt so as to create a greater friction between it and the bolt thread.
- 6. A power tool as defined in claim 3, wherein said bolt thread engaging means is not threaded but has a surface softer than a thread of the bolt to cause friction.
- 7. A power tool as defined in claim 4; and further comprising means for pressing said bolt thread engaging means to and wedging in the bolt thread during turning of the nut and including inclined surface means provided on one of said washer parts and acted upon during turning of the nut so as to press said inner washer part radially in a radially inward direction toward the bolt.
- 8. A power tool as defined in claim 7; and further comprising pin means arranged between said washer parts and acting on said inclined surface means to press said inner washer part in a radially inward direction toward the bolt.
- 9. A power tool as defined in claim 4; and further comprising means for connecting said washer parts with one another so that they are not freely rotatable relative to one another but axially movable relative to one another, said connecting means including a plurality of splines provided on said washer parts and engaging with one another.
- 10. A power tool as defined in claim 4; and further comprising means for connecting said washer parts with one another so that they are not freely rotatable relative to one another but axially movable relative to one another, said connecting means including means for press fitting said washer parts with one another.
- 11. A power tool as defined in claim 4; and further comprising means for connecting said washer parts so that they are not freely rotatable relative to one another but axially movable relative to one another, said connecting means including key means provided between said washer parts.
- 12. A power tool as defined in claim 4, wherein at least one of said washer parts has a non-round surface facing the other of said washer parts and are not freely rotatable relative to one another but axially movable relative to one another.
- 13. A power tool as defined in claim 4, wherein at least one of said washer parts has a cross-section which cooperates of the other of said washer parts so that said washer parts are not freely rotatable relative to one another but axially movable relative to one another.
- 14. A power tool as defined in claim 4; and further comprising means for pressing said inner washer part toward the thread of the bolt and movable between an inoperative position in which it does not press said inner washer part toward the thread of the bolt and an operative position in which it is displaced toward said inner washer part so as to press said inner washer part toward the thread of the bolt.
- 15. A power tool as defined in claim 4; and further comprising connecting means for connecting said washer parts with one another so that they are not freely rotatable relative to one another but axially movable relative to one another, said connecting means including ring gear means engaging with both said washer parts.
- 16. A power tool as defined in claim 15, wherein said ring gear means is provided with plate means adapted to be located between said washer and the object.
- 17. A power tool as defined in claim 4; and further comprising means for connecting said washer parts with one another so that they are not freely rotatable relative to one another but axially movable relative to one another; said connecting means including wedge means provided between said washer parts.
- 18. A power tool as defined in claim 1, wherein said second bearing face surface is formed so as to have a high friction relative to the object.
CROSS-REFERENCE TO A RELATED APPLICATION
[0001] This application is a continuation-in-part of application Ser. No. 10/010,377 filed on Dec. 6, 2001.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
10010377 |
Dec 2001 |
US |
Child |
10120343 |
Apr 2002 |
US |