Spindle Lock for a Hand-Held Combination Drill and Chisel Hammer

• US 20080238001A1
• Filed: 03/27/2008
• Published: 10/02/2008
• Est. Priority Date: 03/28/2007
• Status: Active Grant

• Current Assignee: AEG Electric Tools GmbH (Techtronic Industries Company Limited)
• Original Assignee: AEG Electric Tools GmbH (Techtronic Industries Company Limited)
• Inventors: Pohl, Stefan, Hopp, Jurgen
• Granted Patent: US 7,806,199 B2
• Time in Patent Office: Days
• US Class Current: 279/125
• CPC Class Codes: B25D 16/006 Mode changers; Mechanisms connected thereto
• CPC Class Codes: B25D 2216/0015 Tools having a percussion-only mode
• CPC Class Codes: B25D 2216/0023 Tools having a percussion-and-rotation mode
• CPC Class Codes: B25D 2216/0046 Preventing rotation
• CPC Class Codes: B25F 5/001 Gearings, speed selectors, clutches or the like specially adapted for rotary tools
• CPC Class Codes: Y10T 279/20 with safety feature

Abstract

A spindle lock of a hand-held combination drill and chisel hammer has a gearbox housing and a countershaft rotatably supported in the gearbox housing about an axis of rotation. A locking plate is provided for selectively releasing and locking a rotational movement of the countershaft. Guide elements are disposed in the gearbox housing, wherein the locking plate is displaceably guided on the guide elements in the gearbox housing in a direction parallel to the axis of rotation of the countershaft. The guide elements have a guide rail arrangement wherein a part of the guide rail arrangement is provided on the gearbox housing and is integral with the gearbox housing.

Claims

1. A spindle lock of a hand-held combination drill and chisel hammer, the spindle lock comprising:

a gearbox housing;

a countershaft rotatably supported in the gearbox housing about an axis of rotation;

a locking plate provided for selectively releasing and locking of a rotational movement of the countershaft;

guide means disposed in the gear box housing, wherein the locking plate is displaceably guided on the guide means in the gearbox housing in a direction parallel to the axis of rotation of the countershaft;

the guide means comprising a guide rail arrangement wherein a part of the guide rail arrangement is provided on the gearbox housing and is integral with the gearbox housing.

2. The spindle lock according to claim 1, wherein the at least one guide rail arrangement comprises at least one guide slot that extends parallel to the axis of rotation of the countershaft, wherein a gliding surface of the locking plate is guided slidably in the at least one guide slot.

3. The spindle lock according to claim 2, wherein the guide slot is integrally formed in the gearbox housing and wherein the gliding surface is formed by the locking plate.

4. The spindle lock according to claim 2, wherein a normal to the gliding surface is parallel to a direction of width of the at least one guide slot.

5. The spindle lock according to claim 1, wherein the guide rail arrangement has at least two guide slots extending parallel to the axis of rotation of the countershaft, wherein the locking plate has gliding surfaces and the gliding surfaces each are slidably guided in one of the at least two guide slots, wherein the at least two guide slots have a direction of width and the directions of width of the at least two guide slots are arranged angularly relative to one another.

6. The spindle lock according to claim 5, wherein the directions of width are positioned at a right angle relative to one another.

7. The spindle lock according to claim 5, wherein the at least two guide slots are integrally formed in the gearbox housing and wherein the gliding surfaces are formed by the locking plate.

8. The spindle lock according to claim 5, wherein a normal to the gliding surfaces, respectively, is parallel to the direction of width of the guide slot in which the gliding surfaces are guided, respectively.

9. The spindle lock according to claim 1, wherein the guide means comprise a guide pin formed integrally on the gearbox housing, which guide pin engages a guide opening of the locking plate.

10. The spindle lock according to claim 1, wherein, when the countershaft is demounted, only the guide means that are integrally formed on the gearbox housing are acting on the locking plate.

11. The spindle according to claim 1, further comprising a spring, wherein the locking plate is pretensioned by the spring in a direction opposite to an assembly direction of the spindle lock and wherein a locking edge is formed integrally on the gearbox housing and secures the locking plate in said direction opposite to the assembly direction.