Electric switch, especially for electric hand tools
First Claim
1. An electric switch for an electric hand tool, comprising(a) a housing defined by housing walls;
- one of said housing walls having a throughgoing aperture;
(b) a contact assembly supported in said housing;
(c) a movable actuating member for switching said contact assembly;
(d) control electronics, including a power semiconductor, supported in said housing for controlling a motor of the electric hand tool;
(e) a cooling body disposed externally of said housing;
said cooling body having a throughgoing orifice in alignment with said throughgoing aperture of said housing wall;
(f) a heat-conducting and electrically conducting carrier part supported in said housing and being electrically and heat-conductingly connected to said power semiconductor;
said carrier part extending through said throughgoing aperture of said housing wall and said throughgoing orifice of said cooling body;
said carrier part being oriented substantially perpendicularly to said cooling body and being in a heat-transferring contact therewith; and
(g) fastening means for holding said cooling body against said housing wall;
said fastening means including cooperating parts formed on said carrier part and said cooling body for directly affixing said cooling body to said carrier part by at least one of frictional engagement and form-fitting engagement.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to an electric switch (1), especially for use for an electric hand tool having an electric motor, such as a battery-operated electric tool having a direct-current motor. The switch (1) possesses a housing (2) for receiving a contact system, a movable actuating member which acts on at least one switch contact of the contact system, and control electronics (26) located in the housing (2) as well as an associated power semiconductor (28) for varying the rotational speed of the electric motor. The power semiconductor (28) is connected via a current-bearing and heat-conducting carrier part (31) to the contact system located in the housing (2) and, further, is heat-conductively connected to a cooling body (34) located on the outside of the housing (2). The carrier part (31) extends through a wall perforation (33) of the housing (2) at least as far as the cooling body (34). To simplify assembly, the cooling body (34) is held directly on the carrier part (31) non-positively and/or positively without additional fastening means.
-
Citations
26 Claims
-
1. An electric switch for an electric hand tool, comprising
(a) a housing defined by housing walls; - one of said housing walls having a throughgoing aperture;
(b) a contact assembly supported in said housing; (c) a movable actuating member for switching said contact assembly; (d) control electronics, including a power semiconductor, supported in said housing for controlling a motor of the electric hand tool; (e) a cooling body disposed externally of said housing;
said cooling body having a throughgoing orifice in alignment with said throughgoing aperture of said housing wall;(f) a heat-conducting and electrically conducting carrier part supported in said housing and being electrically and heat-conductingly connected to said power semiconductor;
said carrier part extending through said throughgoing aperture of said housing wall and said throughgoing orifice of said cooling body;
said carrier part being oriented substantially perpendicularly to said cooling body and being in a heat-transferring contact therewith; and(g) fastening means for holding said cooling body against said housing wall;
said fastening means including cooperating parts formed on said carrier part and said cooling body for directly affixing said cooling body to said carrier part by at least one of frictional engagement and form-fitting engagement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- one of said housing walls having a throughgoing aperture;
-
24. An electric switch for an electric hand tool, comprising
(a) a housing defined by housing walls; - one of said housing walls having a throughgoing aperture;
(b) a contact assembly supported in said housing; (c) a movable actuating member for switching said contact assembly; (d) control electronics, including a power semiconductor, supported in said housing for controlling a motor of the electric hand tool; (e) a cooling body disposed externally of said housing; (f) a heat-conducting and electrically conducting carrier part supported in said housing and being electrically and heat-conductingly connected to said power semiconductor;
said carrier part extending through said throughgoing aperture of said housing wall to said cooling body and being in a heat-transferring contact therewith; and(g) cooperating snap-in means provided on said housing and said cooling body for affixing said cooling body to said housing. - View Dependent Claims (25, 26)
- one of said housing walls having a throughgoing aperture;
Specification