Electric screwdriver

Patent metadata

Field	Value
Publication number	US-9434057-B2
Application number	US-201213481432-A
Country	US
Kind code	B2
Filing date	May 25, 2012
Priority date	May 25, 2011
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

An electric screwdriver is disclosed. The screwdriver has a spindle, a locking body, a radial stop, a strap, and a spring. The spindle defines a receiving area and an oblong hole which is open into the receiving area in a radial direction. The locking body is disposed in the oblong hole, where the locking body is protrudable into the receiving area. The radial stop is engageable with the locking body where, when the radial stop engages with the locking body, the locking body protrudes into the receiving area. A first end of the strap engages behind the locking body on a drive end. The spring is disposed between a second end of the strap and the radial stop.

First claim

What is claimed is:

1. An electric screwdriver, comprising:
a spindle, wherein the spindle defines a receiving area which is open on an output end and is oriented along a working axis for receiving a screwdriver bit in an insertion direction and wherein the spindle defines a hole which extends oblong in a longitudinal direction of the spindle and which is open into the receiving area in a radial direction;
a locking body disposed in the hole, wherein the locking body is movable in the hole in the longitudinal direction, and wherein the locking body is protrudable into the receiving area;
a radial stop engageable with the locking body, wherein when the radial stop engages with the locking body the locking body protrudes into the receiving area;
a strap, wherein a first end of the strap engages behind the locking body on a drive end, wherein the drive end is opposite from the open output end of the spindle, and wherein the strap is axially movable; and
a spring, wherein the spring is disposed between a second end of the strap and the radial stop.

2. The electric screwdriver according to claim 1 , wherein the radial stop is disposed on an inside surface of a ring, wherein the ring and the spindle define a cavity, and wherein the locking body is protrudable into the cavity.

3. The electric screwdriver according to claim 2 , wherein a first end of the spring engages the second end of the strap and a second end of the spring engages the ring.

4. The electric screwdriver according to claim 1 , wherein the strap is a sleeve which surrounds the spindle.

5. The electric screwdriver according to claim 1 , further comprising an operating sleeve, wherein the operating sleeve surrounds the spindle, the strap, and the spring, wherein the operating sleeve includes a ring, and wherein the radial stop is disposed on an inside surface of the ring.

6. The electric screwdriver according to claim 5 , wherein the operating sleeve is disposed at a distance from the working axis that is greater than a distance of the radial stop from the working axis.

7. The electric screwdriver according to claim 1 , wherein the radial stop is disposed on an inside surface of a ring and further comprising a first axial stop and a second axial stop, wherein an axial movement of the ring in the insertion direction is limited by the first axial stop and wherein an axial movement of the strap in a direction opposite the insertion direction is limited by the second axial stop.

8. The electric screwdriver according to claim 1 , wherein the strap defines an oblong hole and wherein the locking body is disposed in the oblong hole of the strap.

9. An electric screwdriver, comprising:
a spindle, wherein the spindle defines a receiving area which is open on an output end and is oriented along a working axis for receiving a screwdriver bit in an insertion direction and wherein the spindle defines a hole which extends oblong in a longitudinal direction of the spindle and which is open into the receiving area in a radial direction;
a locking body disposed in the hole, wherein the locking body is movable in the hole in the longitudinal direction, and wherein the locking body is protrudable into the receiving area;
a radial stop engageable with the locking body, wherein when the radial stop engages with the locking body the locking body protrudes into the receiving area;
a strap, wherein a first end of the strap engages behind the locking body on a drive end, wherein the drive end is opposite from the open output end of the spindle; and
a spring, wherein the spring is disposed between a second end of the strap and the radial stop and wherein the spring pushes the radial stop in the insertion direction.

10. The electric screwdriver according to claim 9 , wherein the radial stop is disposed on an inside surface of a ring, wherein the ring and the spindle define a cavity, and wherein the locking body is protrudable into the cavity.

11. The electric screwdriver according to claim 10 , wherein a first end of the spring engages the second end of the strap and a second end of the spring engages the ring.

12. The electric screwdriver according to claim 9 , wherein the strap is a sleeve which surrounds the spindle.

13. The electric screwdriver according to claim 9 , further comprising an operating sleeve, wherein the operating sleeve surrounds the spindle, the strap, and the spring, wherein the operating sleeve includes a ring, and wherein the radial stop is disposed on an inside surface of the ring.

14. The electric screwdriver according to claim 13 , wherein the operating sleeve is disposed at a distance from the working axis that is greater than a distance of the radial stop from the working axis.

15. The electric screwdriver according to claim 9 , wherein the radial stop is disposed on an inside surface of a ring and further comprising a first axial stop and a second axial stop, wherein an axial movement of the ring in the insertion direction is limited by the first axial stop and wherein an axial movement of the strap in a direction opposite the insertion direction is limited by the second axial stop.

16. The electric screwdriver according to claim 9 , wherein the strap defines an oblong hole and wherein the locking body is disposed in the oblong hole of the strap.

Assignees

• Funk Alexander
• Widmer Louis
• Hilti Ag

Inventors

• Funk Alexander
• Widmer Louis

Classifications

• Y10T279/17

  Socket type · CPC title

• B23B31/1071

  Retention by balls (balls acting as jaws B23B31/22) · CPC title

• Y10S279/905

  with ball detent · CPC title

• Y10T279/17752

  Ball or roller jaws · CPC title

• B25B23/0035 Primary

  Connection means between socket or screwdriver bit and tool · CPC title