JP2592266Y2 - Safety switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-button type safety switch in which an operation shaft is locked each time one operation is completed and the next operation cannot be performed unless this lock is released.

[0002]

2. Description of the Related Art A switch provided on a portable operation box of a medical device, for example, may be dangerous if actuated immediately if touched accidentally. Therefore, the switch cannot be operated unless the lock is released. is necessary. In addition, when used in a place where there is a high possibility that various chemicals, washing water and the like are applied, it is desirable that the waterproof type or the drip-proof type be used. There are various types of safety switches that have a lock function for the operation axis and cannot be operated unless the lock is released.However, this type of switch generally has a complicated and large structure. However, there are many switches that are not suitable for use depending on the application, and there are few switches that can be used with confidence in the above-mentioned applications.

[0003]

The present invention pays attention to this point, and is small and suitable as a switch provided in, for example, a portable operation unit of a medical device. If necessary, a waterproof structure can be easily provided. The task was to obtain a switch.

[0004]

In order to achieve the above object, a safety switch according to the present invention comprises an operating shaft mounted on a support plate so as to be non-rotatable and pushable in an axial direction. A lock member provided concentrically on the outer periphery of the shaft and non-movably and rotatably attached to the support plate in the axial direction, and for urging the lock member to rotate in the lock position direction
It is provided with a torsion coil spring , a switch that operates in response to the pressing of the operating shaft, and the following two types of locking means. That is, when the lock member is at the lock position, the first locking means locks the protrusion that rotates with the operation shaft to the lock portion.
Together to engage the timber to disable pushing of the operating shaft, screw
The lock member is rotated to the unlock position against the urging force of the coil spring, and the relief provided on the lock member is released.
By moving the groove to the position of the protrusion, the engagement is released and the operation shaft can be pushed, and the second locking means rotates the lock member to the unlock position. Only when the lock pin is
The lock member is engaged with the engagement hole provided in the lock member.
It is configured to be held in the unlocked position as unrotatable, to release the engagement when the operation shaft is pushed, and to allow the lock member to rotate to the locked position.

[0005]

In the standby state, the operation shaft is locked and cannot be pushed, but when the lock member is turned to the unlock position, the lock is released and the push shaft can be pushed. When the operating shaft is pushed, the switch is activated, and at the same time, the lock member can rotate to the locked position. When the operating shaft returns to the standby position after the pushing operation is completed, the lock member returns to the locked position and the operating shaft is locked again. And cannot be pushed. That is, 1
The operating axis is locked each time the switch operation is completed, and the next operation cannot be performed unless the lock is released each time.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the figure, 1 is an operation shaft, 2 is a lock member, 3 is a torsion coil spring, 4 is a micro switch, 5 is a support plate, 6 is a printed board on which the micro switch 4 is mounted, and 7 is a casing. The casing 7 is provided with a bottom lid 7a and has a cylindrical shape with a small diameter at the top, and is attached to the support plate 5 by a fixing ring 8, into which members such as the operation shaft 1 and the lock member 2 are incorporated. ing. The support plate 5 is, for example, an upper cover of the operation box, and the printed circuit board 6 is attached to a bottom plate 5a of the operation box.

The lock member 2 has a shape corresponding to the shape of the inside of the casing 7 and has a tubular shape with a large-diameter portion 2a at the lower portion. The lock member 2 is rotatably incorporated in the casing 7 and has an upper end portion. A rotary knob 9 is attached. A guide groove 10 is formed in a certain range on the outer periphery of the large diameter portion 2a, and the tip of a screw 11 fixed to the casing 7 is inserted into the guide groove 10 to regulate the rotation range of the lock member 2. The torsion coil spring 3 is provided between the bottom lid 7a of the casing 7 and the large diameter portion 2a of the lock member 2, and the lock member 2 is provided with a biasing force in a counterclockwise direction when viewed from above.

The operating shaft 1 is inserted concentrically inside the lock member 2, and a push button 14 having a rubber cap 14a is fixed to the upper end by a screw 15. A guide shaft 16 is provided on the bottom cover 7a of the casing 7 in parallel with the shaft. Correspondingly, a guide hole 17 is provided in the operation shaft 1 so that the guide shaft 16 is inserted. 5 cannot rotate with respect to the casing 7 fixed to 5, but can move in the axial direction. Between the casing 7 and the lock member 2 and between the lock member 2 and the operation shaft 1, mini-Y packings 18 and 1
9 is provided.

A lower cover 7 of a casing 7 is provided below the operating shaft 1.
a slide shaft 21 is provided through the inner surface of the micro switch. A rod-shaped actuator 22 is housed in the slide shaft 21 and is urged downward by a spring 23. When the operation shaft 1 is pushed, the actuator 22 projects and the micro switch The operation unit 4a is pressed. The operating shaft 1 is urged upward by a spring 24 provided on the outer periphery of the slide shaft 21. The push button 14 fixed to the upper end of the operation shaft 1 is provided with a push button protrusion 26 so as to abut on the upper surface 2b of the lock member 2, and an escape groove 27 for avoiding the contact of the push button protrusion 26. Is provided on the upper surface 2b of the lock member 2 within a certain range, and the push button projection 26 and the escape groove 27 constitute a first locking means 28. A lock pin 3 urged upward by a spring 30 is attached to the large diameter portion 1a at the lower portion of the operation shaft 1.
1 and the lock member 2 is provided with an engagement hole 32 corresponding to the lock pin 31 and the engagement hole 3.
2 together with the second locking means 33.

The rotation range of the lock member 2 is restricted by the combination of the guide groove 10 and the screw 11. The position where the lock member 2 is fully rotated clockwise when viewed from above is the unlock position, The position fully rotated in the direction is the locked position, and the first locking means 28 is in the unlocked position when the push button projection 26 has the release groove 2.
7 is formed at a position where it can be inserted. Further, the second locking means 33 is formed at a position where the lock pin 31 is inserted into the engagement hole 32 at the unlock position, and the lock member 2 is held at the unlock position.

In this embodiment, the second locking means 33 does not have the lock pin 31 inserted into the engagement hole 32 in the standby state, and the lock member 2 has the structure of the torsion coil spring 3 in the standby state. The first locking means 28 is rotated by the urging force to the lock position.
Is brought into contact with the upper surface 2b of the control shaft 1 so that the operation shaft 1 cannot be pushed. That is, the operation shaft 1 is locked so that the micro switch 4 cannot be operated, so that the micro switch 4 does not operate even if the rubber cap 14a or the like is accidentally touched.

When the rotary knob 9 is operated to rotate the lock member 2 clockwise to the unlock position, as shown in FIG. 4A, the escape groove 27 of the lock member 2 pushes the push button protrusion. The engagement between the protrusion 26 and the upper surface 2b is released below the portion 26, the lock pin 31 is inserted into the engagement hole 32 at the same time, the lock member 2 is held in the unlock position, and the operation shaft 1 is locked. Is released, and it becomes possible to push. Therefore, when the operation shaft 1 is pressed down by pressing the rubber cap 14a, the actuator 22 at the lower end of the operation shaft 1 protrudes, the operation unit 4a is pressed, and the microswitch 4 operates. FIG. 4 is an explanatory diagram of the operation, in which a push button projection 26 is provided on the outer periphery of the push button 14 so as to project therefrom.

When the operating shaft 1 is depressed, the lock pin 31 is disengaged from the engagement hole 32, and the lock member 2 is slightly rotated counterclockwise by the urging force of the torsion coil spring 3, and FIG. As shown in (2), the push button projection 26 comes into contact with the end face of the escape groove 27. For this reason, when the push operation is completed and the operating shaft 1 returns to the standby position by the upward biasing force of the spring 23, the push button projection 26 comes off the escape groove 27 as shown in FIG. 2 rotates counterclockwise to the lock position and returns to the initial standby state, the operating shaft 1 is locked again, and the micro switch 4 cannot be operated. Thus, the operation axis 1
Each time is operated, the operation axis 1 is automatically locked,
Unless the lock member 2 is rotated to the unlock position to release the lock, the next operation cannot be performed.
The switch does not operate if touched accidentally or carelessly, ensuring safety.

In the embodiment, the space between the casing 7 and the lock member 2 and the space between the lock member 2 and the operation shaft 1 are sealed with mini-Y packings 18 and 19, respectively. Since the liquid does not penetrate, the waterproof safety switch is suitable for use in an operation box of a medical device as described above. Further, since the torsion coil spring 3 is provided between the bottom cover 7a of the casing 7 and the large diameter portion 2a of the lock member 2 and has a larger diameter than the above-mentioned sealing portion, the torsion coil spring 3 is attached to the lock member 2. It is effective to make the force greater than the resistance force at the sealing portion to smoothly rotate the lock member 2.

[0015]

As is apparent from the above description, the operation shaft of the switch of the present invention is automatically locked each time the switch is operated, and the next operation cannot be performed unless the lock is released each time. Therefore, the switch does not operate with careless contact or operation, so it can be used safely for applications such as portable operation boxes of medical equipment, and the structure is relatively simple and small, and it should be waterproof if necessary. Also an easy safety switch is obtained . Further, the first locking means is a projection.
The combination of the part and the escape groove, the second locking means is a pin and an engagement hole.
Each locking means is simple
Structure provides sufficient strength and durability,
Can retain lock and unlock function over
To improve the reliability of the safety switch.
You.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along the line AA of FIG. 2 of one embodiment of the present invention.

FIG. 2 is a plan view of an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a main part of the embodiment.

FIG. 4 is an operation explanatory diagram of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operating shaft 2 Lock member 3 Torsion coil spring 4 Micro switch 5 Support plate 14 Push button 26 Push button protrusion 27 Escape groove 28 First locking means 31 Lock pin 32 Engaging hole 33 Second locking means

Claims (1)

(57) [Scope of request for utility model registration] 1. An operation shaft mounted non-rotatably and axially pushably on a support plate, and concentrically provided on the outer periphery of the operation shaft so as to be axially immovable on the support plate. A lock member rotatably mounted, and a torsion coil spring for urging the lock member to rotate in the lock position direction;
A switch that operates in response to the pushing of the operation shaft and a protrusion that rotates together with the operation shaft when the lock member is at the lock position are provided.
The lock member is engaged with the lock member so that the operation shaft cannot be pushed, and the lock member is rotated to the unlock position against the urging force of the torsion coil spring .
A state in which the engagement groove is released by moving the released escape groove to the position of the protrusion to release the engagement and allow the operation shaft to be pushed, and the lock member is rotated to the unlock position. Lock pin provided on the operation shaft side only with the lock member
Locking member cannot be turned by engaging with the engaging hole provided in
Held in the unlocking position as the second locking means to allow rotation of the locked position of the locking member to release said engagement when pushing the operating shaft, comprising a city, after pushing completion A safety switch characterized in that the lock member is rotated to the lock position with the return of the operation shaft to the standby position and the operation shaft cannot be pushed again.