Hend-held machine tool

Patent metadata

Field	Value
Publication number	US-10029354-B2
Application number	US-201314434068-A
Country	US
Kind code	B2
Filing date	Oct 8, 2013
Priority date	Oct 8, 2012
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A hand-held power tool comprises a tool receiver, a drive spindle, and at least one active drive unit configured to drive the tool receiver via the drive spindle. The tool receiver and the drive spindle are moveable with respect to each other and connected in the circumferential direction via a form-fit connection.

First claim

The invention claimed is:

1. A hand-held power tool, comprising:
a drive spindle that is rotatable about a rotation axis;
a tool receiver that is axially movable relative to the drive spindle, and that is rotationally connected to the drive spindle via a form-fit connection with circumferential play such that the drive spindle and the tool receiver are rotatable about the rotation axis relative to each other over an extent of the circumferential play without rotational engagement; and
at least one active drive unit configured to selectively drive the tool receiver via the drive spindle around the rotation axis based on at least one characteristic quantity of the circumferential play.

2. The hand-held power tool as claimed in claim 1 , wherein the form-fit connection includes mutually corresponding fitting tooth systems.

3. The hand-held power tool as claimed in claim 2 , wherein the fitting tooth systems have a sliding fit.

4. The hand-held power tool as claimed in claim 1 , wherein the drive spindle and the tool receiver are axially displaceable with respect to each other to at least a limited extent via the form-fit connection.

5. The hand-held power tool as claimed in claim 1 , further comprising:
at least one acquisition unit configured to acquire the at least one characteristic quantity of the circumferential play, wherein the at least one active drive unit is further configured to selectively drive the tool receiver in a drive direction around the rotation axis, the drive direction based on the at least one characteristic quantity of the circumferential play.

6. The hand-held power tool as claimed in claim 1 , wherein the at least one active drive unit is configured to activate in response to an axial displacement of the tool receiver away from an initial axial position relative to the drive spindle.

7. The hand-held power tool as claimed in claim 6 , further comprising:
a reset element configured to bias the tool receiver relative to the drive spindle toward the initial axial position, the reset element received in at least one receiving region of the form-fit connection of at least one of the tool receiver and the drive spindle.

8. The hand-held power tool as claimed in claim 7 , wherein the hand-held power tool has a weight force that is less than or equal to a restoring force of the reset element.

9. The hand-held power tool as claimed in claim 7 , wherein the reset element includes at least one coil spring.

10. The hand-held power tool as claimed in claim 1 , wherein at least one of the tool receiver and the drive spindle are at least one of at least partially sintered and subjected to a hardening process.

11. The hand-held power tool of claim 1 , wherein at least one of the tool receiver and the drive spindle is at least partially sintered by calibrated tools.

12. A hand-held power tool, comprising:
a housing unit;
a tool receiver; and
at least one active drive unit configured to drive the tool receiver about a rotation axis, and including:
at least one motor unit;
at least one acquisition unit configured to detect at least one characteristic quantity of at least one of:
a torque of the tool receiver in a circumferential direction about the rotation axis relative to a corresponding torque of the at least one active drive unit;
a force of the tool receiver in the circumferential direction relative to a corresponding force of the at least one the active drive unit; and
a rotational speed of the tool receiver in the circumferential direction relative to a corresponding rotational speed of the at least one active drive unit; and

an activation unit configured to control the active drive unit and determine a direction of rotation for the tool receiver about a rotation axis based on the at least one characteristic quantity.

13. The hand-held power tool as claimed in claim 12 , further comprising:
a spindle lock device configured to block the tool receiver against turning in the absence of transmission of at least one of rotational speed and torque from the at least one active drive unit.

14. The hand-held power tool as claimed in claim 12 , wherein the tool receiver and the at least one active drive unit are configured to have circumferential play in the circumferential direction about the rotation axis.

15. The hand-held power tool as claimed in claim 14 , wherein the tool receiver and the at least one active drive unit are separate from each other and are connected in the circumferential direction via a form-fit connection.

16. The hand-held power tool as claimed in claim 12 , wherein the at least one acquisition unit has at least one sensor unit configured to acquire at least one characteristic quantity of the rotational speed of the tool receiver.

17. The hand-held power tool as claimed in claim 12 , wherein the at least one acquisition unit has at least one sensor unit configured to acquire a rotary motion of the housing unit relative to the tool receiver.

18. The hand-held power tool as claimed in claim 17 , wherein the at least one sensor unit defines a measuring axis that is aligned coaxially in relation to the rotation axis of the tool receiver.

19. The hand-held power tool as claimed in claim 17 , wherein the at least one sensor unit is configured as at least one rotation rate sensor.

20. The hand-held power tool at least as claimed in claim 17 , wherein the at least one sensor unit includes at least one acceleration sensor.

Assignees

• Bosch Gmbh Robert

Inventors

• Weller Thomas

Classifications

• B25B21/00 Primary

  Portable power-driven screw or nut setting or loosening tools; (details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; {for mounting or dismounting wheels B60B29/006}); Attachments for drilling apparatus serving the same purpose (machines B23P19/06) · CPC title

• B23B31/123

  with locking arrangements (locking arrangements for chucks with simultaneously-acting jaws moving radially actuated by one or more spiral grooves B23B31/16041) · CPC title

• B25B23/141

  Mechanical overload release couplings · CPC title

• B25B21/02

  with means for imparting impact to screwdriver blade or nut socket · CPC title

• B25B23/14

  Arrangement of torque limiters or torque indicators in wrenches or screwdrivers (couplings for transmitting rotation or clutches F16D; devices for measuring torque per se G01L) · CPC title