Electric power tool

Details Electric power tool Electric power tool

2007-08-21

2007-08-21

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

Hammer head driven by pulsating fluid pressure

C173S217000, C173S171000, C310S050000

Reexamination Certificate

active

11295125

ABSTRACT:
An electric power tool includes a percussion mechanism (15) located in an external housing (12) of the power tool (11) and driven by a driving motor (13) connected with the percussion mechanism (15) by a gear unit (14). An arrangement for cooling the power tool (11) includes a fan element (19) located in the external housing for generating a cooling air flow (26), a cooling air channel (18) extending along a longitudinal extent of the percussion mechanism (15) and a cross-section of which has a constriction (21; 51), a fresh air channel (31; 61) having an intake opening (32; 62) for communicating with atmosphere and formed in the external housing (12; 42) and a connection opening (33; 63) for communicating with the cooling air channel (18; 48) and arranged in an area of the constriction (21: 51) of the cooling air channel (18; 48).

REFERENCES:
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patent: 6866105 (2005-03-01), Pfisterer et al.
patent: 6971456 (2005-12-01), Yamada et al.
patent: 7064462 (2006-06-01), Hempe et al.

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