Chuck for a percussion tool

• US 20030116334A1
• Filed: 12/04/2002
• Published: 06/26/2003
• Est. Priority Date: 12/21/2001
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Frenzel, Jens, Schamberger, Michael, Funfer, Josef
• Granted Patent: US 6,820,700 B2
• Time in Patent Office: Days
• US Class Current: 173/132
• CPC Class Codes: B25D 11/005 Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
• CPC Class Codes: B25D 17/088 with radial movable locking elements co-operating with bit shafts specially adapted therefor
• CPC Class Codes: B25D 2217/0042 Ball-shaped locking members
• CPC Class Codes: B25D 2250/131 Idling mode of tools
• CPC Class Codes: B25D 2250/321 Use of balls
• CPC Class Codes: B25D 2250/371 Use of springs
• CPC Class Codes: Y10T 279/17068 Rotary socket
• CPC Class Codes: Y10T 279/17094 Sleeve type retainer
• CPC Class Codes: Y10T 279/17752 Ball or roller jaws
• CPC Class Codes: Y10T 279/3487 Tool or work stop or locator

Abstract

A chuck for a rotary-percussion power tool (2) and including a working tool guide (3) for receiving a shank (5) of a working tool, at least one locking member (4) for limiting an axial displacement of the shank (5) within an axial displacement length (X) from opposite sides, and a displaceable, spring-biased stop member (7) cooperating, within the shank displacement length (X), with a power tool side, stop surface (8) of the shank (5).

Claims

1. A chuck for a rotary-percussion power tool (2), comprising a working tool guide (3) for receiving a shank (5) of a working tool;

at least one locking member (4) for limiting an axial displacement of the shank (5) within an axial displacement length (X) from opposite sides;

a displaceable stop member (7) cooperating, within the shank displacement length (X), with a power tool side, stop surface (8) of the shank (5); and

a spring (6) for biasing the stop member (7) into engagement with the stop surface (8) of the shank (5).

2. A chuck according to claim 1, wherein the stop surface (8) of the shank (5) is formed by a portion of a power tool side, end surface of the shank (5).

3. A chuck according to claim 1, wherein the stop member (7) is arranged on a power tool side of the locking member (4) in an axially spaced relationship relative thereto.

4. A chuck according to claim 1, wherein the stop member (7) is displaced in a radial direction against a biasing force of the spring (6).

5. A chuck according to claim 4, wherein the stop member (7) is radially displaceable between an inner radial stop formed by the working tool guide (3) and facing a guide inner surface (9) of the guide (3) and formlockingly cooperating with the stop member (7), and an outer radial stop formed by the spring (6) and forcelockingly cooperating with the stop member (7).

6. A chuck according to claim 1, wherein the stop-member (7) is formed as a ball.

7. A chuck according to claim 1, wherein the spring (6) is displaceable, at least partially, together with the locking member (4).

8. A chuck according to claim 1, further comprising a manually displaceable, from outside, locking sleeve (11) for displacing the spring (6), the locking sleeve (11) being displaceable one of axially and rotatably.

9. A chuck according to claim 1, wherein the spring (6) has a radially outwardly extending cup (10) that provides space for displacement of the stop member radially outwardly.

10. A chuck according to claim 1, wherein the spring (6) is formed as a ring surrounding the stop member (7) and preloaded radially inwardly.

11. A chuck according to claim 10, wherein the spring (6) is supported, at least partially, on a cylindrical guide surface (12) of the working tool guide (3).

12. A chuck according to claim 10, wherein the spring (6) forms an axially projecting, entraining hook (13) formlockingly engageable in a recess (14) of the at lest partially pivotally displaceable, locking sleeve (11) for joint rotation therewith.