Hand machine tool with battery operated drive motor

• US 5,671,815 A
• Filed: 04/30/1996
• Issued: 09/30/1997
• Est. Priority Date: 06/14/1995
• Status: Expired due to Term

• Current Assignee: Robert Bosch Tool Corporation (Robert Bosch GmbH)
• Original Assignee: Robert Bosch GmbH
• Inventors: Glauning, Rainer, Kabatnik, Wilfried
• Primary Examiner(s): Smith, Scott A.
• Application Number:
  US08/641,198
• Time in Patent Office: 518 Days
• Field of Search: 173/213, 173/217, 310/47, 310/50
• US Class Current: 173/217
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence

Abstract

A hand machine tool with a battery operated drive motor has a plug coupling for electrical contacting of the drive motor with the battery unit mounted on the hand machine tool. The coupling includes a base provided at the machine side and displaceable relative to a machine housing. The base has contact springs which are in contact with contact surfaces provided on a plug housing of the battery unit. A centering element is located between the base and the plug housing and provides a fitting abutment between the contact springs and the contact surfaces.

Claims

1. A hand machine tool, comprising a machine housing;

a drive motor;

a releasably mountable battery unit for current supply of said drive motor and having contact surfaces;

a coupling connection for electrical contacting of said drive motor with said battery unit, said coupling connection including a base received in said machine housing and carrying at least two contact springs arranged at a distance from one another and also contacting with said contact surfaces of said battery unit, said base being movable relative to said machine housing within a limit; and

centering means provided between said base and said battery unit so as to provide a fitting abutment of said contact springs against said contact surfaces.

2. A hand machine tool as defined in claim 1, wherein said centering means includes a centering body located between said contact springs on said base and provided with a guiding opening, and a guiding web fixedly connected with said battery unit and engageable without a gap in said guiding opening.

3. A hand machine tool as defined in claim 2, wherein said centering body has legs which laterally abut against said guiding web when said battery unit is mounted on said machine housing.

4. A hand machine tool as defined in claim 3, wherein said legs of said centering body have free ends provided with insertion inclines for said guiding web.

5. A hand machine tool as defined in claim 2, wherein said battery unit has a plug housing, said guiding web being fixedly connected with said plug housing of said battery unit.

6. A hand machine tool as defined in claim 1, wherein said base is displaceable transversely in said machine housing.