JPH08203389A - Switch using key - Google Patents

Abstract

PURPOSE: To enhance safety during use by providing lock arms by which locking portions are releasably locked into a locking recess and unlocking members by which time lock of the locking portions of the lock arms in the locking recess is undone. CONSTITUTION: When the insertion portion 36 of a key 10 is inserted into a key hole 13 in a key switch main body, the ends of right and left insertion-bar portions 38R, 38L abut and press the projecting parts of the horizontally operating portions 26, 27 of unlocking portions 23R, 23L outside a rotating cam 15. Then the members 23R, 23L are rotated counterclockwise, and the unlocking lever portions 28 of the members 23R, 23L rotate lock arms 24R, 24L against a spring 25. Locking portions 31 at the ends of the arms 24R, 24L are therefore unlocked from a locking recess 22 to undo a lock. On removal of the key 10 a plunger 7 is pushed down by the reverse action to insertion, a switch portion is turned off, the arms 24R, 24L are pressed by the spring 25 and turned, and the locking portions 31 are locked into the locking recess 22 to lock the cam 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key type switch used for opening and closing a power source of a machine tool or the like.

[0002]

2. Description of the Related Art For example, in the case of a machine tool, it is very dangerous to operate it accidentally and suddenly operate it. Machine tools are repaired and inspected by opening the door provided in a part of the net body and entering the inside, but if the external operating unit is operated by mistake at that time, A safety switch is provided on the door portion to prevent the machine from operating.

This safety switch serves as a power switch for a machine tool. For example, a key is attached to the door side, and a switch body is provided at a position where the key is inserted when the door is closed. The power switch is turned on only when it is closed and the key is inserted.

[0004]

However, in the above-mentioned conventional safety switch, it is possible to turn on if something is inserted without necessarily inserting the key, and the safety is not perfect. That is, if the door is closed and the key is not inserted into the switch and there is vibration or something is inserted into the switch, the machine tool will operate due to a wrong operation despite the door being open. It was the cause of the accident.

The present invention has been made in view of the above problems, and an object thereof is to provide a key use type switch which is highly safe in use.

[0006]

To achieve the above object, a key-type switch according to the present invention comprises a key switch main body having a switch section and a switch operating section for opening and closing the switch section. A rotary cam that is rotatably provided in the key switch body and has a cam operating portion that interferes with a key inserted in the key switch body, and a cam portion that is circumscribed with the switch operating portion; A lock forming portion provided on the lock forming portion, and a lock forming portion provided inside the key switch main body and biased by an elastic member to disengage the lock portion from the lock engaging concave portion of the lock forming portion. The lock arm to be engaged and the key rotatably provided coaxially with the rotary cam and inserted into the key switch body interfere with each other before they interfere with the cam operating portion. Characterized by comprising a lock release member for releasing the engagement of the said locking engagement recess of the locking portion of Kkuamu.

The rotary cam may have at least two cam operating portions, and the rotary cam may be operated from at least two directions.

Further, the lock forming portions are provided on both sides of the rotary cam, and lock arms for releasably engaging the lock portions with the lock engaging recesses of the lock forming portions are provided on both sides of the rotary cam. You may distribute it.

Further, the lock releasing member has one-direction and other-direction operating portions on the circumference thereof for interfering with the key and a release lever portion for interfering with the lock lever, and the one-way and other-direction operating portions are provided. You may make it the structure which provided the protrusion part which slidably contacts the peripheral surface of the said lock formation part in each front part of a part.

Also, the key is an insertion bar portion that interferes with the lock release member when the key is inserted into the key insertion opening, and the interference of the insertion bar portion with the lock release member is followed by the insertion bar portion. It may be configured with a contact bar portion that interferes with the rotating cam.

[0011]

With this configuration, when the lock portion of the lock arm is engaged with the lock engaging recess of the lock forming portion and is in the locked state, for example, the rotary cam causes the switch operating portion to reach the maximum width. The switch part is turned off by pushing down with. Therefore, when the key is not used, there is vibration, and even if something is accidentally inserted into the key insertion opening, the rotary cam is prevented from rotating, and the switch unit is erroneously rotated. There is no turning on, ensuring higher safety.

Next, when the key is inserted into the switch main body, the tip of the key comes into contact with the lock releasing member outside the cam operating portion of the rotary cam so as to push the lock releasing member. The lock releasing member rotates to push and rotate the lock arm against the elastic member to release the engagement of the lock portion with the lock engaging recess and release the lock.

Next, the key interferes with and pushes the cam operating portion of the rotary cam, so that the rotary cam rotates and the switch operating portion is guided and moved by the cam portion ( Then, the switch section is turned on.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a partially cutaway front view of a key-using switch according to the present invention, FIG. 2 is a partially broken side view of the key-using switch, and FIG. 3 is a partially broken view of a head of the key-using switch. FIG. 4 is a partially cutaway front view of the head part of the key use type switch, FIG. 5 is an operation explanatory view of the head part of the key use type switch, and FIG. 6 is a head part of the key use type switch. FIG. 3 is an exploded perspective view of the mechanical section of FIG.

The key type switch is composed of a key switch body 1 and a key 10 described later. The key switch body 1 is configured by mounting a head portion 3 on an upper portion of a case body 2 having a switch portion 4 built therein.
The switch section 4 has two pairs of normally closed contact mechanisms 5 and 5. The upper end of the switch operating section 6 for opening and closing the normally closed contact mechanisms 5 and 5 is located on the upper surface of the switch section 4. The switch operating portion 6 includes a plunger 7, and the tip of the plunger 7 is located at the opening 9 portion of the upper surface of the case body 2.

The head portion 3 has a head body 3a, and front and rear wall portions 11a and 11b of the head body 3a.
Bearing holes 12a and 12b are formed in the main body 3a, and a key insertion opening 13 is formed in the right side wall portion 11c of the head body 3a.
Further, key insertion openings 14 are formed in the upper wall portion 11d.

The head portion 3 has a rotary cam 15, left and right lock releasing members 23L and 23R, and left and right lock arms 2.
4L, 24R and a spring 25 which is an elastic member for urging the lock arms 24L, 24R are provided. That is, the rotary cam 15 has a rotary cam body 15a and lock forming portions 15L and 15R formed on the left and right side surfaces of the rotary cam body 15a, as shown in FIG. Spindles 16 and 17 are provided at the central portions of the portions 15L and 15R, respectively. Further, cam operating portions 18 and 19 formed of concave portions are formed on the front and rear of the upper portion of the peripheral portion of the rotary cam body 15a, and a cam portion 20 is formed on the rear side of the lower portion. Further, a lock engaging recess 22 is formed on the right side of the peripheral portions of the lock forming portions 15L and 15R. Further, the cam portion 20 is the valley portion 2
0a, which is curved from the valley portion 20a to the lower end portion 20b.

The unlocking members 23L and 23R have a support hole 29 in the center thereof, and the lateral direction operation portion 26 and the other direction operation portion, which are projection-like one-way operation portions, are provided on the periphery thereof. Has a vertical operation portion 27 and a release lever portion 28, and a projection portion 26a protruding inward is provided at a tip portion of the horizontal operation portion 26, and a tip portion of the vertical operation portion 27 is provided at a tip portion thereof. The projecting portions 27a projecting inward are respectively projectingly provided and made thick, and the inner end surfaces of these projecting portions 26a, 27a are in sliding contact with the peripheral surfaces of the lock forming portions 15L, 15R. The lock arms 24L and 24R each have a mounting portion 30 at the base thereof, a lock portion 31 at the front portion, and a spring locking portion 32 at the middle portion.

The lock releasing members 23L, 23
R is rotatably attached to the rotary cam 15 by inserting the support shafts 16 and 17 into the support holes 29, and the inner end surfaces of the protrusions 26a and 27a of the lock releasing member 23 are locked to the lock forming portion 15L, It makes sliding contact with the peripheral surface of 15R. Then, the support shaft 16 is supported in the support hole portion 12a, and the support shaft 17 is supported in the support hole portion 12b.
5 and the lock release members 23L and 23R are the head portion 3
It is rotatably housed inside.

The lock arms 24L and 24R
Is attached to the lower portion of the head body 3a of the head portion 3 by a pin 33 so as to be swingable in the left-right direction by a mounting portion 30 at the base portion thereof. The spring engaging portions 32 of the lock arms 24L and 24R and the head body 3a. The spring 25 is interposed between the spring locking portion 34 of the right side wall portion 11c and the end portion of the spring 25, and the spring 25 locks the lock arms 24L and 24R.
It is biased toward the L and 15R sides (rearward direction), and the lock portion 31 at the front end of the lock arms 24L and 24R can be engaged with and disengaged from the lock engaging recess 22 on the peripheral surface of the lock forming portions 15L and 15R. Is engaged with.

In this way, the lock arms 24L, 2
The lock portion 31 at the front portion of 4R is the lock forming portion 15L,
In the locked state in which the lock engaging recess 22 on the peripheral surface of 15R is engaged, as shown in FIG. 4, the cam operating portion 18 is in the key insertion opening 13 and the cam operating portion 19 is in the key insertion opening 14. The horizontal direction operating portions 26 of the lock releasing members 23L and 23R are positioned substantially vertically and the vertical direction operating portions 27 are positioned substantially horizontally, respectively, and the cam portions 2 are opposed to each other.
The lower end portion 20b of 0 abuts on the upper end surface portion 7a of the plunger 7.

In this state, the rotary cam 15 pushes down the plunger 7 by the maximum width, and thereby the switch operating portion 6 of the switch portion 4 is pushed down, so that the contact mechanisms 5 and 5 are moved as shown in FIG. , Both are separated and turned off.

As shown in FIG. 7, the key 10 has an insertion portion 36 which is inserted into the key insertion opening 13 and 14, and the insertion portion 36 is provided with a base portion 37 and left and right insertion bar portions 38.
L and 38R are connected, and these insertion bar portions 38L and 38 are connected.
A lateral bar is provided between the front sides of R to form a contact bar portion 39, and a mounting portion 40 is formed on the base portion 37 of the insertion portion 36.

The key-type switch constructed as described above is, for example, a net body (not shown) provided so that the key switch body 1 surrounds a machine tool (not shown).
The key 10 is attached to the edge of the door attachment opening of the key switch and the key 10 is attached to the door (not shown) at the attachment portion 40. When the door is closed, the insertion portion 36 of the key 10 is inserted into the key switch body. It is designed to be inserted into the first key insertion opening 13 (or the key insertion opening 14).

Next, the operation of the key use type switch configured as described above will be described. In the state where the door is opened, the key 10 is not inserted into the key insertion opening 13 of the key switch body 1, and the lock portion 31 at the front end of the lock arm 24 has the lock forming portion 15L as described above.
It is in a locked state by engaging with the locking engagement recess 22 on the peripheral surface of 15R. In this state, the rotary cam 15 pushes down the plunger 7 by the maximum width to push down the switch operating portion 6 of the switch portion 4, and the contact mechanisms 5 and 5 are both separated and turned off.

That is, even when the key 10 is not used, there is vibration or the rotary cam 15 rotates even if something is accidentally inserted into the key insertion opening 13 (or the key insertion opening 14). This prevents the switch section 4 from being accidentally turned on, thereby ensuring higher safety.

Next, when the operator leaves the machine tool and closes the door, the insertion portion 36 of the key 10 is inserted into the key insertion opening 13 of the key switch body 1. This key 10
By inserting the left and right insertion bar portions 38 as shown in FIG.
The tips of L and 38R come into contact with the protrusions 26a of the lateral operation portions 26 of the lock release members 23L and 23R on the outside of the rotary cam body 15a to push them.
The lock release members 23L and 23R rotate counterclockwise in FIG. 5, and the release lever portions 28 of the lock release members 23L and 23R push and rotate the lock arms 24L and 24R against the spring 25. For this reason, the lock portion 31 at the tip of the lock arms 24L and 24R
Is disengaged from the lock engaging recess 22 to release the lock.

Next, the contact bar portion 39 of the key 10 is
In order to enter the cam operating portion 18 of the rotary cam body 15a and press the cam operating portion 18, the rotary cam 15 rotates counterclockwise, and the upper end surface portion 7a of the plunger 7 lowers the lower end of the cam portion 20. This plunger 7 comes off from the portion 20b.
The upper end surface portion 7a of (1) moves (raises) along the curved surface of the cam portion 20 and falls into the valley portion 20a of the cam portion 20, and the plunger 7 rises to the maximum.

When the plunger 7 rises, the switch operating portion 6 of the switch portion 4 also moves upward due to the spring force, whereby the contact mechanisms 5 and 5 are both turned on,
The power of the machine tool is turned on and the machine tool is now ready for operation.

When the key 10 is removed from the state where the key 10 is inserted, the operation opposite to the operation at the time of inserting the key 10 is performed, the plunger 7 is pushed down, and the switch portion 4 is moved. While being forcibly turned off, the lock arms 24L and 24R are urged by the springs 25 to rotate, so that the lock portions 31 at the front ends of the lock arms 24L and 24R are engaged with the locking engagement. The rotary cam 15 is locked by engaging with the recess 22.

When the insertion portion 36 of the key 10 is inserted into the key insertion opening 14 on the upper side of the key switch body 1, the tips of the left and right insertion bar portions 38L and 38R have the rotation cam body 15a. Of the lock release members 23L and 23R, the lock release members 23L and 2L are pressed against the protrusions 27a of the vertical operation portion 27 of the lock release members 23L and 23R.
3R rotates counterclockwise to unlock member 23
The release lever portions 28 of L and 23R are the lock arms 24.
The L and 24R are pushed against the spring 25 and rotated. Therefore, the lock portions 31 at the front ends of the lock arms 24L and 24R are disengaged from the locking engagement recesses 22 to release the lock.

Next, the contact bar portion 39 of the key 10 is
The rotary cam 15 rotates counterclockwise in order to come into contact with and push the cam operating portion 19 of the rotary cam body 15a, so that the upper end surface portion 7a of the plunger 7 is moved to the lower end of the cam portion 20. This plunger 7 comes off from the portion 20b.
The upper end surface portion 7a of (1) moves (raises) along the curved surface of the cam portion 20 and falls into the valley portion 20a of the cam portion 20, and the plunger 7 rises to the maximum.

When the plunger 7 rises, the switch operating portion 6 of the switch portion 4 also moves upward due to the spring force, whereby the contact mechanisms 5 and 5 are both turned on,
The power of the machine tool is turned on and the machine tool is now ready for operation.

When the key 10 is removed from the state in which the key 10 is inserted, the operation opposite to the operation at the time of inserting the key 10 is performed, and the plunger 7 is pushed down and the switch portion 4 is pushed down. Is forcibly turned off, and the lock arms 24L and 24R are urged by the springs 25 to rotate. For this reason, the lock portions 31 at the tips of the lock arms 24L and 24R are locked by the lock members. The rotary cam 15 is locked by engaging with the fitting recess 22.

[0035]

As described above, the key-type switch according to the present invention has a key switch main body having a switch section and a switch operating section for opening and closing the switch section, and a key switch main body in the key switch main body. A rotary cam that is rotatably provided and has a cam operating portion that a key inserted into the key switch body interferes with, and a cam portion that is circumscribing the switch operating portion; A lock forming portion having a fitting recess; a lock arm provided in the key switch body and biased by an elastic member to releasably engage the lock portion with the locking engaging recess of the lock forming portion; The key that is rotatably provided coaxially with the rotary cam and that is inserted into the key switch body interferes with the key operating portion before it interferes with the cam operating portion. A lock releasing member for releasing the engagement with the lock engaging recess, whereby the lock portion of the lock arm engages with the lock engaging recess of the lock forming portion and is in a locked state. In addition, for example, the rotary cam pushes down the switch operating portion by the maximum width to turn off the switch portion.

Next, when the key is inserted into the key switch main body, the tip of the key comes into contact with the lock releasing member outside the cam operating portion of the rotary cam so as to push the lock releasing member. The lock releasing member rotates to push and rotate the lock arm against the elastic member to release the engagement of the lock portion with the lock engaging recess and release the lock.

Next, the key interferes with and pushes the cam operating portion of the rotary cam, so that the rotary cam rotates, and the switch operating portion is guided and moved by the cam portion ( Then, the switch section is turned on.

As described above, by inserting the key into the key switch main body, the lock releasing member is operated to release the lock of the rotary cam by the lock arm,
Subsequently, the key rotates the rotary cam to operate the operation section of the switch section.

Therefore, in the state where the key is not used, the rotary cam is prevented from rotating even if there is vibration, or if something is accidentally inserted into the key switch main body, and By ensuring that the switch does not turn on, a higher level of safety is ensured,
It is highly safe to use.

The rotary cam has at least two cam operating portions, and the rotary cam is operated from at least two directions.
The switch unit can be operated from the direction.

Also, the lock forming portions are provided on both sides of the rotary cam, and lock arms for releasably engaging the lock engaging portions of the lock forming portions with the lock engaging portions are provided on both sides of the rotary cam. By arranging them, stable operation of the switch unit can be performed.

Further, the lock releasing member has one-direction and other-direction operating portions on the periphery thereof, where the key interferes, and a release lever portion which interferes with the lock lever, and the one-way and other-direction operating portions. Since each of the tip portions of the one-direction and other-direction operation portions has a protrusion portion that is in sliding contact with the peripheral surface of the lock forming portion, the thick portion And when inserting the key,
This key surely interferes with the tip of the one-direction and other-direction operation portion, and the lock can be reliably released.

Further, the insertion bar portion which interferes with the lock releasing member when the key is inserted into the key insertion opening, and the interference of the insertion bar portion with the lock releasing member, By using the contact bar portion that interferes with the rotating cam, the operation of the switch portion can be performed reliably and stably by using this key.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a key type switch according to the present invention.

FIG. 2 is a partially cutaway side view of the key type switch.

FIG. 3 is a partially cutaway side view of the head portion of the key-operated switch.

FIG. 4 is a partially cutaway front view of the head portion of the key type switch.

FIG. 5 is an operation explanatory diagram of a head portion of the key-operated switch.

FIG. 6 is an exploded perspective view of a mechanism portion of a head portion of the key-using switch.

FIG. 7 is a perspective view of a key.

[Explanation of symbols]

 1 Key Switch Main Body 4 Switch Part 6 Switch Operating Part 10 Key 15 Rotating Cam 15L, 15R Lock Forming Part 18, 19 Cam Operating Part 20 Cam Part 22 Lock Engagement Recess 23L, 23R Lock Release Member 24L, 24R Lock Arm 25 Spring 31 Lock part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigenobu Kishi, Omron Co., Ltd. 10 Hanazono Dodocho, Ukyo-ku, Kyoto City, Kyoto Prefecture

Claims (5)

[Claims] 1. A key switch main body having a switch part and a switch operating part for opening and closing the switch part, and a key rotatably provided in the key switch main body and inserted into the key switch main body. A rotary cam having a cam operating portion that interferes with each other and a cam portion circumscribing the switch operating portion, a lock forming portion provided on the rotary cam and having a locking engaging concave portion, and provided inside the key switch body. A lock arm that is urged by an elastic member to releasably engage the lock portion with the lock engaging recess of the lock forming portion, and the key switch is rotatably provided coaxially with the rotary cam. A lock release member that interferes with the key inserted into the main body before it interferes with the cam operating portion to release the engagement of the lock portion of the lock arm with the lock engaging recess. Key-use switches, comprising the. 2. The key-operated switch according to claim 1, wherein the rotary cam has at least two cam operating portions, and the rotary cam is operated from at least two directions. 3. The lock forming portions are provided on both sides of the rotary cam, and lock arms for releasably engaging the lock portions with the lock engaging recesses of the lock forming portions are provided on both sides of the rotary cam. The key use type switch according to claim 1 or 2, which is arranged. 4. The lock releasing member has a one-way and other-direction operating section on the periphery thereof, with which the key interferes, and a release lever section which interferes with the lock lever, and the one-way and other-direction operating sections. The projection part which slidably contacts the peripheral surface of the said lock formation part was provided in each front part of a part.
Alternatively, the key-operated switch according to claim 3. 5. An insertion bar portion that interferes with the lock release member when the key is inserted into the key insertion opening, and the interference of the insertion bar portion with the lock release member is followed by the insertion bar portion. The key use type switch according to claim 1, 2 or 3, wherein the contact bar portion interferes with the rotary cam.