JPS6121782Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a forward/reverse control switch mechanism using a toggle switch.

Generally, in the field of dental machines and instruments, toggle switches that can be operated to raise or lower to forward/reverse command positions are used for forward/reverse control of motors. This type of toggle switch is equipped with a manual lever that can be tilted up and down in three angularly adjacent positions, and this manual lever can be moved halfway to each of the tilted positions, that is, a forward rotation command position, a neutral position, and a reverse rotation command position. be kept in a fixed state. Therefore, in such a toggle switch, when the operator switches the motors from normal rotation to reverse rotation or from reverse rotation to normal rotation, the manual lever instantly jumps over the neutral position and switches to the other switching position. It will be switched to.

Therefore, when a conventional toggle switch is used alone, overload is applied to the motors that are rotating by inertia due to rapid switching to the reverse direction command position, and accidents such as burnout of the motors are likely to occur.

In order to solve the above-mentioned problems in the use of toggle switches, the present invention provides a forward/reverse control switch that is structured so that a manual lever in one switching position cannot be rapidly switched to the other switching position. This is a proposed mechanism.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

The mounting base 3, which is attached to the chassis 1 with a set screw 2, has a pair of arms 3a extending horizontally,
3b. A pair of vertically opposed screw holes 4a, 4b are bored in these arms 3a, 3b, and screws 5, 6 having central axes 5a, 5b at their tips are fixed to these screw holes 4a, 4b. be done. A U-shaped bracket 7 is swingably supported on the central shafts 5a and 5b. That is,
Small holes 8a and 8b are bored in both sides 7a and 7b of the bracket 7, into which the central shafts 5a and 5b can be inserted.

According to the present invention, the middle side 7 of the bracket 7
A toggle switch 9 is fixed to c with a manual lever 9a extended horizontally. The manual lever 9a of the toggle switch 9 can be selectively raised and lowered to a forward rotation command switching position a, a neutral position b, and a reverse rotation command switching position c, as shown in FIG.

The forward/reverse control switch mechanism of the present invention includes a position regulating plate 11 formed with a window 10 through which the manual lever 9a can pass. The window 10 has a first operation position opening part 1 that can receive only the manual lever 9a in the normal rotation command switching position a and the neutral position b.
0a, and a second operating position opening part 10b which is horizontally adjacent to this operating position opening part 10a and receives only the manual lever 9a located at the neutral position b and the reverse rotation command switching position c. The operating position opening parts 10a and 10b are communicated by a neutral position opening part 10c that receives only the manual lever 9a in the neutral position b. In other words, the manual lever 9a is located at the operating position opening section 10.
Forward rotation command switching position a only when in position a
In addition, it is possible to switch to the reverse rotation command switching position c only when the operating position is located in the open portion 10b.

Note that, according to the present invention, the neutral position opening portion 10c
A pair of stoppers 12a, 12b should be protruded from both sides of the switch, so that the manual lever 9a cannot be operated to the other switching position until the manual lever 9a is completely restored to the neutral position. .

Since the forward/reverse control switch mechanism according to the present invention has the structure described above, it is possible to toggle the switch only after the manual lever 9a has been completely returned to the neutral position.
Switch 9 cannot be switched to the opposite switching position. Therefore, during the inertial rotation period of the motors controlled by the toggle switch 9, there is no possibility that the manual lever 9a will be operated to the opposite switching position, and the motors will be overloaded due to rapid switching. It won't happen. In addition, according to the present invention, the desired purpose can be achieved by simply changing the mounting structure without changing the structure of the toggle switch, so it can be provided at a relatively low cost. .

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of the forward/reverse control switch mechanism according to the present invention, Fig. 2 is a plan view of the same switch mechanism,
FIG. 3 is a side view of the switch mechanism. 5a, 6a... Central axis, 7... Bracket, 9
...Toggle switch, 9a...Manual lever, 1
0...window, 10a, 10b...operating position opening part,
10c... Neutral position opening part, 11... Position regulating plate.

Claims (1)

[Scope of utility model registration request] A toggle switch attached to the middle side of the "U" shaped bracket, means provided on both sides for swingably supporting the bracket about a central axis, and a manual lever for the toggle switch. a position regulating plate formed with a window that can be penetrated through the bracket; A forward/reverse control switch mechanism comprising a position opening section and a neutral position opening section which communicates between these operation position opening sections and allows passage of only the manual lever in a neutral state.