JPS6340330B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a delay switch having a momentary contact and an auxiliary contact which operates with a delay with respect to the momentary contact.

Conventionally, pistol-type switches have been widely used as operating switches to open and close large currents, such as in power tools, but for safety reasons, these types of power tools start slowly at first and then gradually increase to high-speed rotation. In order to protect the contacts, it is necessary to prevent the contacts from welding due to rush current.

The present invention was made in response to the above-mentioned needs, and an object of the present invention is to provide a delay switch that suppresses inrush current and enables smooth startup.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

The drawing shows a pistol type switch which is an example of the present invention, and by rotating a push button 1 which is an example of an operating member in the direction of the arrow around a support shaft 2, an operating shaft 4 is connected to an upper case via a pin 3. 5a by a certain stroke to the right in FIG.
The movable plate 6 is reversed clockwise in FIG. 3 about the support shaft 6a, and a movable contact piece 8 provided on the movable plate 7 that interlocks with the movable plate 6 is combined with a pair of fixed contact pieces 10 provided on the lower case 5b. The instantaneous contact is closed by entering between the contact portions of the contact portion.

Furthermore, as shown in FIG. 7, a first operating piece 11 and a second operating piece 14, which are slidably engaged with each other in the longitudinal direction, are housed in the cases 5a and 5b so as to be movable in the left-right direction in FIG. has been done. A boss portion 12 is provided at one end of the first operating piece 11, and a spring receiving portion 13 is provided at the other end. On the other hand, the second operating piece 14 has a boss portion 14a at one end, an opening hole 16 at the other end through which the spring receiving portion 13 and the compression coil spring 15 can be inserted, and a projecting piece 17 at one side.
A slider 19 having a spring 18 on the lower surface is provided so as to be movable up and down. This slider 19 slides on the upper surface of a movable piece 21 that is swingably supported by a fixed terminal 20 fixed to the lower case 5b as the second operating piece 14 moves.
By reversing and swinging the movable piece 21, an auxiliary contact consisting of a contact on the movable piece 21 and a contact on the other fixed terminal 22 is opened and closed.

A sliding body 23 made of a rubber body is housed in the recess _5b1 of the lower case 5b, and the protruding piece 17 of the second operating piece 14 slides into a sliding groove 24 provided at the center of the sliding body 23. It is inserted freely. A notch 25 is provided on the upper surface of one end of the sliding body 23, and when the instantaneous contact is OFF, the operating shaft 4 is inserted into the notch 25.
The convex portion 4a provided in the groove 4a is located, and the sliding body 23 is not pressed (see FIG. 6), so that no frictional force acts between the sliding groove 24 and the protruding piece 17. When the actuating shaft 4 moves to the left in FIG. 6 in conjunction with the push button 1, the convex portion 4a presses the upper surface of the sliding member 23 to narrow the width of the sliding groove 24, and the second It is configured to apply a frictional force between the protruding piece 17 of the operating piece 14 and the sliding groove 24. By this,
Frictional force can only be applied during ON operation. The sliding body 23 is provided with a plurality of small holes 26 in parallel with the sliding groove 24, and the small holes 26 give the sliding body 23 soft elasticity in the vertical compression direction.

A protruding shaft 6b (see FIGS. 1 and 9) protruding from the side surface of the movable plate 6 is engaged between the boss portion 12 of the first operating piece 11 and the boss portion 14a of the second operating piece 14. When the movable plate 6 moves in reverse during the ON operation, the protruding shaft 6b presses the boss portion 12 of the first operating piece 11, causing the first operating piece 11 to move in the direction of the arrow in FIG. let Then, the first operating piece 11
a second coil connected via a coil spring 15 to
The operating piece 14 also attempts to follow the direction of the arrow in FIG.
The second operating piece 14 is braked by the sliding friction with the first operating piece 11, and the second operating member 14 follows the first operating member 11 later than the first operating member 11. That is, the auxiliary contact operates with a delay with respect to the instantaneous contact. In addition, when the movable plate 6 reverses and returns during the OFF operation, the protruding shaft 6 of the movable plate 6
b comes into contact with the boss portion 14a of the second operating piece 14, and the second operating piece 14 returns in conjunction with the movable plate 6, and
The operating piece 11 is also adapted to return substantially integrally with the second operating piece 14.

The lower surface of the sliding body 23 is located in the recess 5 of the lower case 5b.
b It is designed to be pushed up by the tip of an adjustment screw 28 via an adjustment plate 27 that can be moved up and down within ₁ .
By screwing the adjusting screw 28 into the lower case 5b by an appropriate amount, the adjusting plate 27 is moved and the sliding body 23 is compressed in the vertical direction. The sliding friction force can be adjusted. Thereby, the time until the second operating piece 14 operates with a delay with respect to the first operating piece 11, that is, the delay time of the auxiliary contact can be freely adjusted. If a spring (not shown) is provided between the adjusting screw 28 and the adjusting plate 27, it is possible to prevent the adjusting plate 27 from wobbling or loosening the adjusting screw 28 due to dimensional variations.

FIG. 11 shows an example of a circuit diagram for operating a load L such as a power tool using the pistol-type switch, in which 30 is an instantaneous contact, 31 is an auxiliary contact that operates with a delay, and 32 is an external resistor. By wiring in this way, the inrush current when the instantaneous contact 30 closes is suppressed by the external resistor 32, the startup is gradual, and then the auxiliary contact 31 closes and high-speed rotation occurs. Can be done. Therefore, operational safety is high, and there is no fear of contact welding due to inrush current.

In the above embodiment, the first operating piece 11 and the second operating piece 14 are connected via the coil spring 15, and the protruding piece 17 of the second operating piece 14 is connected to the sliding groove 24 of the sliding body 23 made of a rubber body. By inserting the coil spring 17 between the protrusions 17 and the sliding groove 24 and setting the friction force between the protrusion 17 and the sliding groove 24 to be smaller than the spring force of the coil spring 15,
Although the pistol-type switch in which the auxiliary contact is operated with a delay has been described, the present invention is not limited to the pistol-type switch and can be applied to various switches. You can also use it as In addition, the first operating piece 11
The second operating piece 14 is slidably engaged in the longitudinal direction, and is not limited to the case where a coil spring 15 is provided between both operating pieces 11 and 14. For example, both operating pieces 11 and 14 are provided rotatably. , both operating pieces 11,
A torsion spring may be provided as the elastic means for connecting the parts 14.

In addition, as in the above embodiment, when returning (when OFF operation), the protruding shaft 6b of the movable plate 6 and the second operating piece 14
Since the second operating piece 14 returns in conjunction with the movable plate 6 by contacting with the boss portion 14a of the auxiliary contact, there is no fear that the contact opening force and opening speed of the auxiliary contact will decrease. In particular, high snap-action performance is required when direct current is opened and closed, such as in a pistol-type switch, so the above configuration can prevent return failures due to contact welding.

As is clear from the above explanation, according to the present invention, the auxiliary contact turns on with a delay after the instantaneous contact turns on.
Since a delay mechanism for ON operation is provided, inrush current is suppressed and smooth startup is possible, making it possible to obtain a delay switch with high safety and no fear of contact welding.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of a pistol-type switch which is an example of the present invention when it is OFF, Fig. 2 is a plan view with the upper case removed, and Fig. 3 is
4 is a vertical sectional view seen from the back when OFF, FIG. 5 is a sectional view taken along the - line in FIG. 1, FIG. 6 is a sectional view taken along the - line in FIG. 2, Figure 7 is an exploded perspective view of the main parts, Figure 8
9 is a front view of the assembled state, FIG. 9 is a rear view thereof, FIG. 10 is a front view of the state in which the first operating piece is operated, and FIG. 11 is a circuit diagram. 1...Push button, 4...Operating shaft, 4a...Protrusion, 5a...Upper case, 5b...Lower case, 6,
7... Movable plate, 8... Movable contact piece, 10... Fixed contact piece, 11... First operating piece, 14... Second operating piece, 15... Coil spring, 17... Projecting piece,
20, 22... Fixed terminal, 21... Movable piece, 23
...Sliding body, 24...Sliding groove, 25...Notch, 2
6...small hole, 27...adjustment plate, 28...adjustment screw.

Claims (1)

[Scope of Claims] 1. An instantaneous contact that opens and closes by operating an operating member, a first operating piece that operates in conjunction with the opening and closing operation, and a first operating piece that is connected to the first operating piece via an elastic means. a second action piece that follows the first action piece;
A delay switch comprising a sliding body that operates the second operating piece later than the first operating piece due to sliding friction with the second operating piece, and an auxiliary contact that is opened and closed by the second operating piece. 2. The delay switch according to claim 1, wherein the first operating piece and the second operating piece are slidably engaged with each other, and an elastic means made of a coil spring is provided between the operating pieces. 3 The sliding body is a rubber body having a sliding groove in the center, and the second operating piece is provided with a protruding piece that is inserted between the sliding grooves, and a part of the operating shaft that interlocks with the operating member is made of rubber. 3. The delay switch according to claim 1, wherein the delay switch is configured to press the body in a direction in which the sliding groove narrows. 4. Claim 1, characterized in that the sliding body is a rubber body having a sliding groove in the center, and a small hole parallel to the sliding groove is provided in the rubber body.
The delay switch according to item 1, 2 or 3.