JP2005153029A - Mounting structure for sliding resistance substrate in switch for electric tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for a sliding resistance substrate in a switch for an electric tool in which the cost reduction can be realized by reducing the number of components when the switch for an electric tool is assembled and which can be easily mounted to the electric tool. <P>SOLUTION: An external circuit connection terminal is made as a connector. The connector 16 is connected to the sliding resistance substrate. An opening part 17 is formed to a housing 12. The sliding resistance substrate is arranged to the inside of the opening part. The connector connected to the sliding resistance substrate is arranged to the outside of the opening part. Consequently, the cost reduction can be realized by reducing the number of components when the switch 1 for an electric tool is assembled. The switch for an electric tool can be easily mounted to the electric tool. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention, for example, easily attaches a sliding resistance board for changing the rotational speed of an electric tool in an electric tool switch disposed in an electric tool such as an electric drill and a connector connected to the sliding resistance board. It is related with the attachment structure of the sliding resistance board | substrate in the switch for electric tools which enabled it to perform.

Conventionally, as a switch for an electric tool disposed in an electric tool such as an electric drill, for example, a common terminal fixed to the bottom surface of a base member is rotated in a seesaw shape around a central part of a contact piece and fixed to one end. A movable contact piece having a movable contact point facing the contact point and a bent portion bent in a hook shape at the other end, and an operator for turning on and off the switch through the front surface of the base member can be pressed against the bent portion. An operating portion having a guide portion, a spring reversing portion having a reversing spring supported so as to be rotatable by a holding member protrudingly contacting the front surface of the base member and coupled in association with the operating portion, and the base There is an electric switch having a spring holding member provided on a member and a pressing spring inserted between the movable contact piece.
JP 2002-175739 A

  In the known technique of Patent Document 1, an opening is formed in a case, a terminal is disposed through the opening, and the inside and outside of the electric switch can be electrically connected through the terminal.

  FIG. 4 shows a case where the rotational speed of an electric tool such as an electric drill can be varied by using this type of electric tool switch. As shown in FIG. 4, a hole 3 is formed in the housing 2 of the power tool switch 1, and the operation member 4 is slidable through the hole 3 so that the inside of the housing 2 can be slid. It is inserted up to.

  An elastic body 5 such as a spring material is disposed at the end of the operation member 4 in the housing 2, and the operation member 4 is always attached in a direction protruding from the housing 2 by the elastic body 5. It is energized.

  For this reason, when the pressing force is released after the operating member 4 is artificially pressed and slid in the direction of the advancing direction arrow a, the operating member 4 is always urged by the elastic body 5. Therefore, the operation member 4 automatically returns to the original position.

  The operating member 4 is provided with a movable contact piece 6. The movable contact piece 6 moves as the operating member 4 slides. That is, the operating member 4 is artificially pressed. When the slider 6 slides in the direction of arrow a, the movable contact piece 6 disposed on the operation member 4 moves in the direction of arrow a together with the operation member 4.

  In the housing 2, a sliding resistance substrate 7 is disposed horizontally with the traveling direction of the operation member 4, and the movable contact piece 6 is in contact with the sliding resistance substrate 7. Although not shown, a circuit composed of a resistance element or the like is formed on the sliding resistance substrate 7, and the movable contact piece 6 moves and slides on the surface of the sliding resistance substrate 7. By changing the position where the contact piece 6 and the sliding resistance substrate 7 are in contact with each other, the resistance value obtained from the sliding resistance substrate 7 is changed.

  The sliding resistance board 7 is provided with a plurality of external circuit connection terminals 8 connected to a circuit outside the electric tool switch 1, and the external circuit connection terminals 8 are formed on the sliding resistance board 7. For example, it is connected to the circuit by soldering or the like.

  Therefore, by sliding the operation member 4 and moving the movable contact piece 6 attached to the operation member 4, the position where the movable contact piece 6 and the sliding resistance substrate 7 come into contact is changed, By changing the resistance value obtained from the sliding resistance board 7, the rotation of a motor or the like (not shown) of an electric tool such as an electric drill to which the electric tool switch 1 is attached and connected via the external circuit connection terminal 8 is performed. The speed can be switched.

  A plurality of holes 9 are formed in the housing 2 of the power tool switch 1, and a plurality of external circuit connection terminals 8 are arranged one by one in each of the holes 9.

  However, in the prior art of FIG. 4, the external circuit connection terminals 8 are disposed in the plurality of holes 9 formed in the housing 2 of the power tool switch 1. The number of parts and the number of assembling steps are increased by several minutes, and the cost is increased. Since the external circuit connection terminal 8 protrudes from the housing 2 of the power tool switch 1, the power tool switch 1 is attached to the power tool. There is a problem that the work is difficult.

  Therefore, in the mounting structure of the sliding resistance board in the conventional power tool switch, the number of parts when assembling the power tool switch is reduced, the cost is reduced, and the power tool switch is easily attached to the power tool. It has a problem that needs to be solved.

  As a specific means for solving the problems of the conventional example described above, the mounting structure of the sliding resistance board in the switch for the electric tool according to the present invention is inserted in a slidable state at least in a hole formed in the housing. An operation member, a movable contact piece that moves as the operation member slides, a sliding resistance board that contacts the movable contact piece, and a plurality of external circuit connection terminals connected to the sliding resistance board A switch for an electric tool, wherein the external circuit connection terminal is formed into a connector, the connector is connected to the sliding resistance board, an opening is formed in the housing, and the sliding resistance board is arranged inside the opening. The main feature is that the connector connected to the sliding resistance board is disposed outside the opening.

  As described above, the mounting structure of the sliding resistance board in the power tool switch according to the present invention includes at least the operating member inserted in a slidable manner in the hole formed in the housing, and the operating member. A switch for an electric tool comprising: a movable contact piece that moves in accordance with the sliding movement; a sliding resistance board that contacts the movable contact piece; and a plurality of external circuit connection terminals that are connected to the sliding resistance board. The external circuit connection terminal is formed into a connector, the connector is connected to the sliding resistance board, an opening is formed in the housing, and the sliding resistance board is disposed inside the opening to provide the sliding resistance. By arranging the connector connected to the board outside the opening, the number of parts when assembling the power tool switch can be reduced to reduce the cost, and the power tool switch can be easily used as a power tool. take It can ensure that kicked, an excellent effect that it is possible to share the components.

Next, the present invention will be described in detail based on specific embodiments.
A structure for attaching a sliding resistance board in the power tool switch according to the embodiment of the present invention will be described with reference to FIGS. In the embodiment of the present invention, the external circuit connection terminals of the prior art are arranged as connectors, and the other configurations are the same as the prior art. Since the description of components having the same configuration is repeated, the same reference numerals are given to facilitate understanding of the drawings, and detailed description thereof will be omitted.

  FIG. 1 is an exploded perspective view schematically showing a mounting structure of a sliding resistance board in a power tool switch according to the present invention. The housing 12 of the power tool switch 11 includes a housing upper member 12a and a housing bottom member 12b. A hole (not shown) formed at a joint between the housing upper member 12a and the housing bottom member 12b is formed. Thus, the operating member 4 is inserted into the housing 12 in a slidable state.

  An elastic body 5 and a movable contact piece 13 are disposed on the side of the operation member 4 inserted into the housing 12, and the operation member 4 protrudes from the housing 12 by the elastic body 5. Is biased in the direction. For example, an elastic body such as a spring can be used as the elastic body 5.

  The movable contact piece 13 is formed by bending a long and substantially rectangular metal plate having both ends formed in a strip shape, and both sides are bent into a substantially mountain shape, leaving the central portion of the metal plate. Since it is a leaf spring shape, it has elasticity.

  A slide guide portion 14 is formed on the side of the operation member 4 inserted into the housing 12, and a slide guide groove 15 is formed on the upper portion of the housing bottom member 12b. Then, the sliding guide portion 14 of the operating member 4 is fitted into the sliding guide groove 15 of the housing bottom member 12b, so that when the operating member 4 is artificially pressed, along the sliding guide groove 15 Since the sliding guide portion 14 slides, the operation member 4 slides within a predetermined range.

  On the side where the movable contact piece 13 is disposed parallel to the advancing direction of the operation member 4 in the housing 12, the sliding resistance substrate 7 is disposed with a gap that can contact the movable contact piece 13. A connector 16 is disposed and connected to the sliding resistance substrate 7.

  Although not shown, the connector 16 is provided with a plurality of external circuit connection terminals that are connected to an external circuit of the power tool switch 11, and the external circuit connection terminals are connected to the sliding resistance. Since the circuit is formed on the substrate 7 by soldering or the like, for example, the circuit outside the power tool switch 11 and the sliding resistance substrate 7 are connected via the sliding resistance substrate 7 of the connector 16. It is possible to electrically connect the circuit formed in the above.

  An opening 17 having the size of the connector 16 is formed at a predetermined position of the housing upper member 12a. When the sliding resistance board 7 is disposed inside the housing 12, that is, inside the opening 17, The connector 16 protrudes from the opening 17 so that the connector 16 is disposed outside the opening 17.

  Although not shown, a notch corresponding to the protrusion 7a of the sliding resistance substrate 7 is formed inside the upper housing member 12a, and the notch is engaged with the protrusion 7a. By doing so, the movement of the sliding resistance substrate 7 is prevented.

  FIG. 2 is a schematic cross-sectional view of the power tool switch 11. As shown in FIG. 2, the sliding resistance substrate 7 is disposed on the side where the movable contact piece 13 is disposed, and the movable contact piece 13 and the sliding resistance substrate 7 are always in contact with each other. It is in.

  Therefore, when the operation member 4 is artificially pressed and slid, the movable contact piece 13 attached to the operation member 4 moves as the operation member 4 slides. When the contact position between the contact piece 13 and the sliding resistance board 7 changes, the resistance value obtained from the sliding resistance board 7 changes, and the change in the resistance value is disposed in the connector 16. Further, it becomes possible to switch the rotation speed of a motor (not shown) connected via a plurality of external circuit connection terminals.

  FIG. 3 is a schematic perspective view of the power tool switch 11. As shown in FIG. 3, when the connector 16 is disposed outside the opening 17 formed in the housing upper member 12a, the connector 16 does not protrude from the power tool switch 11, and the housing 16 It fits within the outer peripheral surface of 1.

  As described above, since the external circuit connection terminals are arranged as connectors, it is only necessary to arrange and connect the connector 16 to the sliding resistance board 7. Therefore, the number of parts when assembling the power tool switch 11 can be reduced. The opening 17 is formed in the housing upper member 12a of the housing 12, and the sliding resistance board 7 is disposed inside the opening 17 so that the sliding resistance board 7 can be reduced. Since the connected connector 16 is disposed outside the opening 17, the projecting portion of the power tool switch 11 is eliminated, and the power tool switch 11 can be easily attached to the power tool.

It is the perspective view which disassembled and showed schematically the attachment structure of the sliding resistance board | substrate in the switch for electric tools which concerns on this invention. It is sectional drawing which showed schematically the attachment structure of the sliding resistance board | substrate in the switch for electric tools. It is the perspective view which showed schematically the attachment structure of the sliding resistance board | substrate in the switch for electric tools. It is explanatory drawing at the time of enabling it to change the rotational speed of electric tools, such as an electric drill, using the switch for electric tools which is a prior art example, and is the perspective view which notched and showed a part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11 Switch 2 for electric tools 2, 12 Housing 3, 9 Hole part 4 Operation member 5 Elastic body 6, 13 Movable contact piece 7 Sliding resistance board 7a Protrusion part 8 External circuit connection terminal 12a Housing upper member 12b Housing bottom member 14 Sliding guide portion 15 Sliding guide groove connector 16
Opening 17

Claims (1)

An operation member inserted in a state slidable at least in a hole formed in the housing, a movable contact piece that moves as the operation member slides, and a sliding resistance substrate that contacts the movable contact piece And a switch for an electric tool comprising a plurality of external circuit connection terminals connected to the sliding resistance board,
The external circuit connection terminal is formed into a connector, the connector is connected to the sliding resistance board, an opening is formed in the housing, and the sliding resistance board is disposed inside the opening, and the sliding resistance board is formed. A structure for mounting a sliding resistance board in a switch for an electric tool, wherein a connector connected to the outside is disposed outside the opening.

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