JPH0318148Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a safety device for preventing malfunction of a motor due to battery insertion in a power tool having a built-in battery.

(Prior Art) Conventional power tools of this type are configured such that a switch is held in an on state or an off state regardless of the presence or absence of a battery in a battery chamber.

(Problems to be Solved by the Invention) Therefore, for example, if the battery is inserted into the battery chamber in the switched-on state after charging, there is a risk that the motor will start and the cutlery will be driven to rotate.

An object of the present invention is to provide a safety device for a battery-type power tool that can avoid the above-mentioned dangers.

(Means for Solving the Problems) The present invention is a battery-type power tool in which a switch is slidably opposed to a switch in order to turn on and off a switch to drive and stop a motor driven by a battery in a battery chamber. The switch lever includes an operating piece for sliding the switch lever, and a lever that can move in and out of the battery chamber in order to slide the switch lever, which has been displaced toward the switch on side, toward the switch off side by inserting the battery into the battery chamber. The gist of the safety device is a safety device in which a contacting piece that is formed to be elastically deformable is connected.

(Function) In the device of the present invention, a contact piece is formed on the switch lever provided for sliding the switch to move in and out of the battery chamber. The switch is configured to be switched to the switch-off state by pushing the touch piece.

(Example) Next, an example in which the present invention is embodied in an electric trimmer will be described with reference to the drawings.

The housing 2 of the electric trimmer body 1 is approximately T-shaped from the front.
It is formed in a mold shape, and a battery holder 4 is installed at one end to removably store the battery 3 at its upper end, and a set plate 5 is installed at the other end.
A battery chamber 6 that is opened and closed by the battery chamber 6 is formed in a horizontally elongated shape, and below the battery chamber 6 is connected a motor chamber 7 that is partitioned via a partition wall 1a to house a motor 8. A through hole 9 is provided through the battery chamber 6 and the vicinity of the front end of the motor chamber 7 to communicate with each other.

Thumbscrew 11 near the bottom end of housing 2
The trimmer base 10 is fastened so as to be able to slide up and down through the trimmer base 10. The trimmer base 10 has a substantially cylindrical shape and has a mounting part 10a opened near the front lower part, and a rectangular plate-shaped bit 12 inserted into the lower end of the trimmer body 1 is inserted through the mounting part 10a. A board 10b having a circular bit hole 13 for the purpose of mounting is connected vertically, and a scale 14 displayed near the lower end of the housing 2 and an arrow 1 displayed on the mounting part 10a are connected to each other.
5 to position the trimmer base 10 and tighten it to the trimmer body 1 with the thumbscrews 11.

Switch 16 for starting and stopping the motor 8
is a push button 16 installed near the upper end of the motor chamber 7 and below the through hole 9, and protruding downward.
When push button 16a is pushed up, the switch is turned on and the motor 8 is started, and when the push button 16a is released from the pressed state, the switch is turned off and the motor 8 is stopped.

The switch lever 17 is the push button 1 of the switch 16
Switch 1 to push and release 6a.
Operation piece 1 is placed opposite to 6 so as to be able to slide up and down.
8 and switch lever 1 displaced to the switch side.
7 to the switch-off side when the battery 3 is inserted into the battery chamber 6.
The contact piece 19 extends above the contact piece 8 so as to be elastically deformable.

The operation piece 18 has a base 18a attached to the housing 2 so as to be slidable against the inner wall surface of the housing 2, and an operation window 20 opened in the housing 2 facing the switch 16 for sliding the switch lever 17 in the vertical direction. A knob 18b exposed to the outside of the housing 2 through the housing 2 and a pushing part 18c protruded inward to push up the push button 16a of the switch 16 are connected to each other. The switch lever 17 is selectively engaged with a pair of upper and lower engaging portions 21, 21 recessed in the inner wall surface of the switch lever 17.
A lock piece 22 formed for locking the upper moving end and lower moving end is slightly protruded.

On the other hand, the tactile piece 19 has a flexible part 19a connected to the upper end of the operation piece 18 and curved so as to be elastically deformable into an arc shape, and a flexible part 19a that moves the battery 3 into the battery chamber 6 when the switch lever 17 is in the upward movement state. When the battery escapes backward through the through hole 9, the battery chamber 6 is removed through the through hole 9.
When the battery 3 is inserted into the battery chamber 6, it is pushed down by the battery 3 during insertion, retreats from the battery chamber 6, and moves downward together with the operation piece 18, so that it can move in and out of the battery chamber 6. The protrusion 19b is bent into the protrusion 1.
Extending portion 19 extending horizontally to the outside of 9b
c are connected to each other, and when the battery 3 is inserted into the battery chamber 6, the flexible part 19a is bent and deformed by the vertical movement of the operation piece 18, and the protruding part 19b slides on the lower surface of the battery 3. The switching operation of the switch 16 is permitted.

Next, the operation and effects of the embodiment having the above configuration will be explained.

Now, in this example, a switch lever 17 that is placed opposite to the switch 16 so as to be able to slide up and down in order to turn the switch 16 on and off has an operation piece 18 for sliding the switch lever 17.
And the switch lever 17 was displaced to the switch-on side.
In order to slide the battery 3 to the switch-off side when the battery 3 is inserted into the battery chamber 6, a contact piece 19 is provided which is formed to be able to move in and out of the battery chamber 6 and to be elastically deformable.

Therefore, when the battery 3 is inserted into the battery chamber 6, the contact piece 19 is bent and deformed by the sliding operation of the switch lever 17, and the switch 16 can be turned on and off. When the battery 3 is removed from the battery chamber 6, the vicinity of the tip of the protrusion 19b of the contact piece 19 enters the battery chamber 6, and when the battery 3 is reinserted into the battery chamber 6 after being charged, the contact does not occur. The switch lever 17 moves downward as the piece 19 is pushed down by the battery 3 while it is being inserted, and the switch 16 automatically turns off when the battery 3 is stored, so the motor 8 and the bit 12
It is possible to prevent the risk that the battery 3 will be rotated by the insertion operation of the battery 3.

(Effect of the invention) In other words, the present invention has a switch lever that is slidably placed opposite to the switch in order to turn the switch on and off to drive and stop the motor driven by the battery in the battery chamber. an operating piece for moving the switch lever into the switch-on side and sliding the switch lever, which has been displaced toward the switch-on side, toward the switch-off side by inserting the battery into the battery chamber; The continuous arrangement of the contact piece has the effect of preventing the bit from starting when the battery is inserted into the battery chamber in the switched-on state.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a partially cutaway side view of the main part, Fig. 2 is a vertical sectional view of the main part to explain the operation of the switch lever, and Fig. 3 is a perspective view of the electric trimmer. It is a diagram. 3...Battery, 6...Battery chamber, 8...Motor, 16...Switch, 17...Switch lever, 18...Operation piece, 19...Touching piece.

Claims (1)

[Scope of utility model registration request] In order to turn the switch on and off and drive and stop the motor driven by the battery in the battery chamber, the switch lever is slidably placed opposite to the switch, and has an operation piece for sliding the switch lever, and a switch lever that is attached to the switch side. In order to slide the displaced switch lever to the switch-off side by the operation of inserting the battery into the battery chamber, a contact piece formed to be able to move in and out of the battery chamber and to be elastically deformable is provided in series. A safety device for battery type power tools.