Hand machine tool with tool holder

• US 5,342,154 A
• Filed: 03/18/1993
• Issued: 08/30/1994
• Est. Priority Date: 03/18/1992
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Holzer, Peter
• Primary Examiner(s): Bishop, Steven C.
• Application Number:
  US08/033,137
• Time in Patent Office: 530 Days
• Field of Search: 279/79, 279/80, 279/143-145, 279/158, 279/89, 279/90, 408/238, 408/239 R, 408/239 A, 408/240, 408/241 R, 403/326, 403/327
• US Class Current: 408/240
• CPC Class Codes: B23Q 3/12 for securing to a spindle in general B23Q3/152 takes precedence; chucks B23B31/02
• CPC Class Codes: Y10T 279/17794 Sleeved
• CPC Class Codes: Y10T 279/3406 Adapter
• CPC Class Codes: Y10T 403/602 by separate spring
• CPC Class Codes: Y10T 408/953 Clamping jaws

Abstract

A hand machine tool has a rotatable spindle having a longitudinal axis and provided with a cone and an annular surface extending at an angle to the longitudinal axis, a tool holder having a conical opening which surrounds the cone, torque-transmitting elements provided between the spindle and the tool holder, and locking elements cooperating with the ring surface of the spindle, the locking elements being formed as spring wire members.

Claims

1. A hand machine tool, comprising a rotatable spindle having a longitudinal axis and provided with a cone and a ring surface extending at an angle to said longitudinal axis;

a tool holder having a conical opening which surrounds said cone;

torque-transmitting elements provided between said spindle and said tool holder and formed as form-locking elements which connect said tool holder with said spindle for torque-transmission therebetween; and

locking means separate from said torque-transmitting elements and cooperating with said ring surface of said spindle exclusively for locking said tool spindle, said locking means being formed as spring wire members.

2. A hand machine tool as defined in claim 1, wherein said ring wire members engage said ring surface of said spindle, and said ring surface of said spindle is formed as a conically reducing surface.

3. A hand machine tool as defined in claim 1, wherein said ring wire members engage said ring surface of said spindle, and said ring surface of said spindle extends substantially perpendicularly to said longitudinal axis of said spindle.

4. A hand machine tool as defined in claim 1, wherein said tool has a base body, said locking means having at least one locking arm which is radially turnably supported in said base body.

5. A hand machine tool as defined in claim 1, wherein said spring wire members extend substantially tangentially to said ring surface.

6. A hand machine tool, comprising a rotatable spindle having a longitudinal axis and provided with a cone and a ring surface extending at an angle to said longitudinal axis;

a tool holder having a conical opening which surrounds said cone;

torque-transmitting elements provided between said spindle and said tool holder;

locking means cooperating with said ring surface of said spindle, said locking means being formed as spring wire members; and

a rotatable clamping ring which acts on said locking means.

7. A hand machine tool as defined in claim 6, wherein said locking elements are pressable by said clamping ring against said ring surface of said spindle under its own prestress.

8. A hand machine tool as defined in claim 6, wherein said tool holder has a base body, said clamping ring has a curved path, said locking means including a locking element which has one end radially fixedly anchored in said base body of said tool holder and another end provided with a clamping arm cooperating with said curved path of said clamping ring.

9. A hand machine tool as defined in claim 8, wherein said curved path for said locking element has a depression and an arresting trough.

10. A hand machine tool, comprising a rotatable spindle having a longitudinal axis and provided with a cone and a ring surface extending at an angle to said longitudinal axis;

a tool holder having a conical opening which surrounds said cone;

torque-transmitting elements provided between said spindle and said tool holder;

locking means cooperating with said ring surface of said spindle, said locking means being formed as spring wire members;

a form-locking structural element which connects said tool holder with said spindle for torque-transmission therebetween; and

an adaptor having a thread for screwing a conventional drill chuck, said structural elements being mounted on said adaptor and cooperating with said spindle.

11. A hand machine tool, comprising a rotatable spindle having a longitudinal axis and provided with a cone and a ring surface extending at an angle to said longitudinal axis;

a tool holder having a conical opening which surrounds said cone;

torque-transmitting elements provided between said spindle and said tool holder; and

locking means cooperating with said ring surface of said spindle, said locking means being formed as spring wire members, said tool holder having passages through which said locking means pass, said passages running under an angle on said ring surfaces of said spindle and leading said locking means inclinedly on said ring surface.