JPH0645701U - Portable power tools - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an insulating plate of a portable power tool, and an object of the present invention is to integrate a pair of conventional stop plates into one insulating plate to form an outer periphery of a bearing chamber of a housing. By fitting in the groove, the assemblability around the brush holder is improved. [Structure] By assembling an insulating plate 19 in which a pair of conventional stop plates 10 are integrated with a material having electrical insulation performance into a bearing chamber outer peripheral groove 18 of the housing 2, assembly work around the brush holder 11 is performed. I made it easy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a portable power tool having a pair of stop plates that fit with a pair of brush holders.

[0002]

[Prior art]

 A conventional portable power tool will be described with reference to FIGS. Here, the portable electric circular saw machine 1 will be described as an example of the portable power tool. FIG. 3 is a front view of the portable electric circular saw machine 1, 5 is a circular saw blade driven by a motor, 6 is a base that serves as a reference surface during cutting, and 7 is a saw cover that covers the circular saw blade 5. FIG. 4 is a rear view of the portable electric circular saw 1, 2 is a metal housing containing a motor, 3 is a tail cover for covering the rear opening of the housing 2, and 8 is a motor provided on the tail cover 3. Wind windows 4 for sucking the cooling air are screws for fixing the tail cover 3 to the housing 2.

FIG. 5 is a partial cross-sectional view of the housing 2. Reference numeral 18 denotes a bearing chamber outer peripheral groove of the housing 2 which holds a bearing on the side of the tail cover 3 of an armature constituting a motor, 10 is a stop plate, 11 is a brush holder, Reference numeral 12 is a stator that constitutes a motor, and 13 is a brush terminal. The brush holder 11 is composed of an insulating tube 14 and a conductive tube 15, and the stator 12 and the brush holder 11 are electrically connected via a brush terminal 13 and a lead wire. The stop plate 10 is provided in order to increase the creepage distance L between the housing 2 and the brush terminal 13 to prevent conduction to the housing 2. That is, the chips generated during cutting are sucked together with the motor cooling air from the wind window 8 and enter the housing 2, and even if chips adhere to the tube 15, the tube 15 and the housing 2 Since the stop plate 10 is interposed therebetween, it is difficult for the housing 2 to pass through, and electrical safety for the user of the electric circular saw machine 1 is improved.

[0004]

[Problems to be solved by the device]

 Conventionally, when the stop plate 10 is installed, the stop plate 10 must be held by all means in order to be installed in the brush holder 11 in the direction of the arrow B. Also, two stop plates 10 are required, and the number of parts is large. Therefore, there was a problem that the assemblability deteriorates. An object of the present invention is to solve the above problems and improve the assemblability of this type of power tool.

[0005]

[Means for Solving the Problems]

 The above object is achieved by integrally forming a pair of stop plates into an insulating plate structure so as to fit in the outer peripheral groove of the bearing chamber of the housing.

[0006]

[Action]

 When the insulating plate configured as described above is used, the insulating plate may be fitted in the outer peripheral groove of the housing in one direction and attached. At this time, it is not necessary to hold the stop plates as in the conventional case, and the same effect as when the stop plates on both sides are attached at the same time can be obtained, so that the assemblability is improved.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an insulating plate 19 integrally formed with a stop plate 10. The insulating plate 19 in which the two stop plates 10 are integrally formed is provided with the holes 20 on the left and right for fitting with the tubes 15 of the brush holder 11 and the holes 21 for fitting with the outer circumferential groove 18 of the housing bearing chamber. Further, a plurality of holes 22 corresponding to the wind window 8 of the tail cover 3 which is an inlet of the cooling air for cooling the motor are provided on the side surface and the rear surface of the insulating plate 19.

When assembling the insulating plate 19 configured as described above, as shown in FIG. 2, the insulating plate 19 is assembled until it abuts in the direction of arrow A so as to fit into the bearing chamber outer peripheral groove 18 of the housing 2. After that, the brush holder 11 may be assembled in the housing 2 in the direction of arrow B. By assembling in this way, the insulating plate 19 can be easily attached to the tube 15. At this time, the movement in the arrow D direction is regulated by the outer circumferential groove 18 of the housing, and the movement in the arrow E direction is regulated by the tube 15 of the brush holder 11. No fixing is necessary. After that, the brush terminal 13 may be attached to the tube 15 as in the conventional example described above.

[0009]

[Effect of device]

 According to the present invention, a pair of stop plates are integrally formed as an insulating plate so as to fit into the outer circumferential groove of the housing bearing chamber, so that the assembly around the brush holder is simplified and the assemblability is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an insulating plate of the present invention.

FIG. 2 is a partial sectional plan view showing an embodiment of a portable electric circular saw machine adopting the present invention.

FIG. 3 is a front view showing an example of a portable electric circular saw machine.

FIG. 4 is a rear view of FIG.

FIG. 5 is a partial cross-sectional plan view showing an example of a conventional portable electric circular saw machine.

[Explanation of symbols]

Reference numeral 1 is a portable electric circular saw machine, 2 is a housing, 11 is a brush holder, 17 is a brush holder mounting hole, 18 is a groove in the housing bearing chamber, and 19 is an insulating plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Niwa 1060 Takeda, Katsuta City, Ibaraki Prefecture Hitachi Koki Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A metal housing having a built-in motor and having a bearing chamber substantially at the center of the rear end thereof, and a pair of brush holders fitted into holes facing each other provided in the housing.
A portable electric tool comprising a pair of stop plates fitted to the brush holder and made of an insulating material, the pair of holes being fitted to the brush holder and the bearing chamber being fitted to the facing surface and the central surface, respectively. A portable electric tool characterized in that a brush holder is fitted into the pair of holes of a U-shaped insulating plate having holes to be fitted, and a creepage distance between the brush holder and the housing is increased.