Square tool holder and impact wrench

Patent metadata

Field	Value
Publication number	US-10759028-B2
Application number	US-201615746595-A
Country	US
Kind code	B2
Filing date	Jul 27, 2016
Priority date	Jul 27, 2015
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A square tool holder ( 10 ) for an impact wrench is provided, including an anvil ( 1 ), on which a drive square ( 2 ) is situated for accommodating a tool, in particular an impact wrench socket, and including a safety bolt ( 3 ) for securing the accommodated tool, the safety bolt ( 3 ) being spring-mounted in the drive square ( 2 ) in such a way that the safety bolt is movable perpendicularly to the axis of rotation (D) of the anvil ( 1 ), the safety bolt ( 3 ) having a rounded, preferably hemispherical surface ( 3 ′), which protrudes from a holding surface ( 2 ′) of the drive square ( 2 ) in a state of spring-extension (AZ) of the safety bolt ( 3 ) and is at least partially countersunk in the holding surface ( 2 ′) in a state of spring-compression of the safety bolt ( 3 ), the safety bolt ( 3 ) being secured against falling out by at least one safety pin ( 4, 4 ′) situated in the drive square ( 2 ).

First claim

The invention claimed is:

1. A square tool holder for an impact wrench, comprising:
an anvil, a drive square situated on the anvil for accommodating a tool, the anvil having a rotation axis;
a safety bolt for securing the accommodated tool, the safety bolt being spring-mounted in the drive square, movable perpendicularly to the rotation axis, the safety bolt having a rounded surface protruding from a holding surface of the drive square in a state of spring-extension of the safety bolt and being at least partially countersunk in the holding surface in a state of spring-compression of the safety bolt; and
a safety pin situated in the drive square, the safety bolt being secured against falling out by the safety pin; the drive square having a groove shoulder protruding axially from an end face for accommodating a retaining element, the retaining element fixing the position of the safety pin in the accommodated state.

2. The square tool holder as recited in claim 1 wherein the safety pin extends in parallel to the rotation axis of the anvil.

3. The square tool holder as recited in claim 2 wherein the safety pin is situated in a blind hole extending from an end face of the drive square in parallel to the rotation axis of the anvil.

4. The square tool holder as recited in claim 1 wherein the safety bolt has a rotationally symmetrical design and a tapering, the safety pin engaging with the tapering for securing the safety bolt in the drive square.

5. The square tool holder as recited in claim 1 wherein a diameter of the safety pin is smaller than a smallest diameter of the safety bolt within the drive square.

6. The square tool holder as recited in claim 1 wherein the retaining element is a retaining ring or a locking spring.

7. The square tool holder as recited in claim 1 wherein the safety bolt is spring-mounted with the aid of a pressure spring.

8. The square tool holder as recited in claim 7 wherein the pressure spring is a helical spring.

9. The square tool holder as recited in claim 1 further comprising a second safety pin for securing the safety bolt against falling out.

10. The square tool holder as recited in claim 9 wherein the second safety pin is situated in parallel to the first safety pin.

11. The square tool holder as recited in claim 1 wherein the tool is an impact wrench socket.

12. The square tool holder as recited in claim 1 wherein the rounded surface is a hemispherical surface.

13. An impact wrench comprising the square tool holder as recited in claim 1 ; and the tool.

14. The impact wrench as recited in claim 13 wherein the tool is an impact wrench socket.

15. The square tool holder as recited in claim 1 wherein the retaining element is a retaining ring.

16. The square tool holder as recited in claim 15 wherein the retaining ring is situated on the groove shoulder.

17. The square tool holder as recited in claim 15 wherein the retaining ring blocks an end of the safety pin.

18. The square tool holder as recited in claim 17 wherein the retaining ring blocks a further end of a further safety pin.

19. The square tool holder as recited in claim 1 wherein the groove shoulder is circular, and the retaining element is a retaining ring fitting around the protruding groove shoulder.

20. The square tool holder as recited in claim 1 wherein the safety pin extends in parallel to the rotation axis of the anvil, the safety pin is situated in a blind hole extending from an end face of the drive square in parallel to the rotation axis of the anvil, the groove shoulder being circular, and the retaining element being a retaining ring, the retaining ring fitting around the protruding groove shoulder to prevent the safety pin from moving out of the blind hole.

21. A square tool holder for an impact wrench, comprising:
an anvil, a drive square situated on the anvil for accommodating a tool, the anvil having a rotation axis;
a safety bolt for securing the accommodated tool, the safety bolt being spring-mounted in the drive square, movable perpendicularly to the rotation axis, the safety bolt having a rounded surface protruding from a holding surface of the drive square in a state of spring-extension of the safety bolt and being at least partially countersunk in the holding surface in a state of spring-compression of the safety bolt; and
two safety pins situated in the drive square in blind holes extending from an end face of the drive square in parallel to the rotation axis of the anvil, the safety bolt being secured against falling out by the two safety pins; the drive square having a groove shoulder protruding axially from an end face for accommodating a retaining element, the retaining element being a retaining ring, the retaining ring fitting around the protruding groove shoulder to prevent the two safety pin from moving out of the blind holes.

22. The square tool holder as recited in claim 21 wherein the two safety pins are spaced by a distance, the safety bolt fitting between the two safety pins.

Assignees

• Hilti Ag

Inventors

• Funk Alexander

Classifications

• B25B23/0035 Primary

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

• B25B21/026

  Impact clutches · CPC title

• B25B21/02 Primary

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

• B25B23/00

  Details of, or accessories for, spanners, wrenches, screwdrivers (bolt tensioners B25B29/02) · CPC title