JPH08203390A - Switch using key - Google Patents

Abstract

PURPOSE: To provide a switch that uses a key and ensures high safety during use. CONSTITUTION: Locking members 16R, 16L and a spring 17 intervening between the locking members 16R, 16L are enclosed in the locking-member storage hole portion 18 of a rotating cam 15, and a support shaft 28 is inserted into the bearing hole portions of the locking members 16R, 16L, with both ends of the support shaft 28 rotatably supported in the bearing hole portions 12a, 12b of a head 3. Then the locking members 16R, 16L are separated from each other by the energizing force of a spring 17, and the locking projections 24 of the locking members 16R, 16L are inserted into locking hole portions 30a, 30b to lock a rotating cam 15. The guide surface portions 26 of the locking members 16R, 16L are pressed by an operating portion at the end of a key inserted in the key hole 13, so as to move the locking members 16R, 16L against a spring 17 to unlock the locking projections 24 of the locking members 16R, 16L from the locking hole portions 30a, 30b to undo a lock.

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]

In order to achieve the above object, a key-type switch according to the present invention comprises a switch part, a switch operating part for opening and closing the switch part, and a switch body side engaging part. A key switch body having
Rotation provided in the key switch main body with a cam operating portion that is rotatably provided and interferes with a key inserted in the key switch main body, a cam portion that is circumscribed with the switch operating portion, and a lock member storage hole portion. A cam, a lock member that is provided in the lock member storage hole portion of the rotating cam so as to be movable in the axial direction of the lock member storage hole portion and not rotatable, and has a lock member side engaging portion on the outer side; An elastic member that urges the lock member outward to engage the lock member side engagement portion with the switch body side lock portion in a disengageable manner, and interferes with the lock member by being inserted into the key switch body. Then, the lock member is moved against the elastic member to release the engagement of the lock member side engagement portion with the switch body side lock portion and interfere with the cam operation portion of the rotary cam. The times Characterized in that a key to rotate the cam.

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

Further, a guide surface portion may be formed on an outer peripheral edge portion of a peripheral surface portion of the lock member, and an operating portion for contacting the guide surface portion and moving the lock member may be provided at a tip end portion of the key.

There is a pair of the lock members, and the elastic member urges the pair of lock members outward to engage the lock member side engaging portion with the switch body side locking portion in a disengageable manner. The key may simultaneously unlock the pair of lock members.

Further, the key rotates the insertion bar portion that interferes with the lock member when the key is inserted into the key switch body, and the rotation of the insertion bar portion following the interference of the insertion bar portion with the lock member. A contact bar portion that interferes with the cam may be provided.

[0011]

With this structure, when the lock member moves outward due to the urging force of the elastic member and the lock member side engaging portion engages with the switch body side engaging portion, it is in a locked state. For example, the rotary cam pushes down the switch operating portion by the maximum width to turn off the switch portion. 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 key switch main body, the tip of the key comes into contact with and pushes the lock member, so that the lock member moves inward to lock the lock member. The engagement of the member side engaging portion with the switch body side engaging portion is released to 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 cutaway side view of the same key-using switch, and FIG. 3 is a key insertion port of a head portion of the key-using switch. 4 is an exploded perspective view of a mechanism portion of a head portion of the key-using switch, FIG. 5 is an explanatory view of a rotary cam locked state in the head portion of the key-using switch, and FIG. 7 is an explanatory view of the unlocked state of the rotary cam in the head part of the key switch, FIG. 7 is an operation explanatory diagram of an initial state of key insertion in the head part of the key use switch, and FIG. 8 is a head part of the key use switch. It is an operation explanatory view of a key insertion state.

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.
The bearing holes 12a and 12b and the bearing holes 12
The lock holes 30a and 30b, which are switch-side engaging portions, are formed by being deviated from a and 12b, and the key insertion opening 13 is provided on the right side wall portion 11c of the head body 3a.
Key insertion openings 14 are formed in the upper wall portion 11d. These key insertion openings 13 and 14 are U-shaped as shown in FIG.

The head portion 3 has a rotating cam 15, a pair of lock members 16L and 16R, and these lock members 16L and 16R.
The spring 17 is an elastic member for biasing L and 16R. The rotary cam 15 has a rotary cam body 15a as shown in FIG. 4, and a lock member housing hole 18 is formed at the center of the rotary cam body 15a. An engaging projection 19 is formed on the circumferential surface along the axial direction of the lock member housing hole 18. Further, cam operating portions 20 and 21 formed of concave portions are formed in the front and rear of the upper portion of the peripheral portion of the rotary cam body 15a, and a cam portion 22 is formed on the rear side of the lower portion.

The lock members 16L and 16R are
It has a disk-shaped member body 16a, and a bearing hole 23 is formed in the center of the member body 16a. Further, the outer surface of the member body 16a has a center (bearing hole 23) An engaging projection 24, which is an engaging portion on the lock member side, is provided so as to be displaced. A spring receiving portion 25 is formed at the center of the inner surface of the member main body 16a, and the outer peripheral edge of the peripheral surface of the member main body 16a is chamfered to form a tapered guide surface 26. And a locking engagement recess 27 is formed on the peripheral surface of the member body 16a.

The lock member storage hole 18 of the rotary cam 15 stores the lock members 16L and 16R and the spring 17 interposed between the spring receiving portions 25 of the lock members 16L and 16R. Therefore, the engaging projection 19 of the rotary cam 15 is slidably engaged with the locking engaging recess 27 of the lock members 16L and 16R. Then, the bearing holes 23 of the left and right lock members 16L and 16R
A support shaft 28 is inserted into the shaft 28, and both ends of the support shaft 28 are
The head members 3 are rotatably supported in the bearing holes 12a and 12b, the lock members 16L and 16R are separated from each other by the urging force of the spring 17, and the engagement protrusion 24 of the front lock member 16L is Lock hole 30a
Further, the engagement protrusions 24 of the rear lock member 16R are inserted into the lock hole portions 30b, respectively, and the rotary cam 15 is locked.

Thus, when the rotary cam 15 is in the locked state, the cam operating portion 20 is in the key insertion opening 13 and the cam operating portion 21 is in the key insertion opening 1 as shown in FIG.
4 and the lower end portion 22a of the cam portion 22 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 the switch operating portion 6 of the switch portion 4 is pushed down by this, so that the contact mechanisms 5 and 5 are moved as shown in FIG. , Both are separated and turned off.

The key 10 has an insertion portion 30 which is inserted into the key insertion opening 13 and 14 as shown in FIGS. 9 (1) and 9 (2). The left and right insertion bar portions 32L and 32R connected to each other are provided,
A lateral bar is provided between the front sides of the insertion bar portions 32L and 32R to form a contact bar portion 33, and the contact portion 33 is formed.
An attachment portion 45 is formed on the base portion 34 of 0. The insertion bar portions 32L and 32R have an L-shaped cross section, and an operating portion 35 having a C surface inclined inward is formed at the tip end portion thereof.

The key type switch having the above-described structure 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 45 of the key switch body when the door is closed. 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 main body 1, and the rotary cam 15 is inserted as described above.
Is locked. 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, when the key 10 is not used, the rotary cam 15 rotates even if there is vibration or 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 30 of the key 10 is inserted into the key insertion opening 13 of the key switch body 1. This key 10
Insertion of the left and right insertion bar portions 32 as shown in FIG.
Since the actuating portion 35 at the tip of the L, 32R abuts against and pushes the guide surface portion 26 of the lock members 16L, 16R, the lock members 16L, 16R cause the spring 1 to move.
The locking projections 24 of the lock members 16L and 16R are disengaged from the lock holes 30a and 30b by moving in the direction of the center of the lock member housing hole 18 against 7 to release the lock.

Next, the contact bar portion 33 of the key 10 is
The rotary cam 15 rotates counterclockwise in FIG. 1 in order to come into contact with and push the cam operating portion 20 of the rotary cam body 15a, so that the upper end surface portion 7a of the plunger 7 has the cam portion. The plunger 7 is disengaged from the lower end portion 22a, and the upper end surface portion 7a of the plunger 7 moves (raises) along the curved surface of the cam portion 22 to raise the plunger 7 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 members 16L and 16R are urged by the springs 17 to move outward, respectively. For this reason, the engagement protrusions 24 of the lock members 16L and 16R are moved to the lock hole portions 30a. , 30b to lock the rotary cam 15.

When the insertion portion 30 of the key 10 is inserted into the upper key insertion opening 14 of the key switch body 1, the insertion of the key 10 causes the left and right insertion bar portions 32 to be inserted.
Since the actuating portion 35 at the tip of the L, 32R abuts against and pushes the guide surface portion 26 of the lock members 16L, 16R, the lock members 16L, 16R cause the spring 1 to move.
The locking projections 24 of the lock members 16L and 16R are disengaged from the lock holes 30a and 30b by moving in the direction of the center of the lock member housing hole 18 against 7 to release the lock.

Next, the contact bar portion 33 of the key 10 is
The rotary cam 15 rotates counterclockwise in FIG. 1 in order to enter and abut against the cam operating portion 21 of the rotary cam body 15a, and the upper end surface portion 7a of the plunger 7 has the cam portion. The plunger 7 is disengaged from the lower end portion 22a, and the upper end surface portion 7a of the plunger 7 moves (raises) along the curved surface of the cam portion 22 to raise the plunger 7 to the maximum.

When the plunger 7 is raised, the switch operating portion 6 of the switch portion 4 is also moved upward by 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, the plunger 7 is pushed down, and the switch portion 4 is moved. While being forcibly turned off, the lock members 16L and 16R are urged by the springs 17 to move outward, respectively. For this reason, the engagement protrusions 24 of the lock members 16L and 16R are moved to the lock hole portions 30a. , 30b to lock the rotary cam 15.

[0034]

As described above, according to the key use type switch of the present invention, the lock member is moved outward by the urging force of the elastic member so that the lock member side engaging portion is the switch. When the main body side engaging portion is engaged and is in a locked state, 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 and pushes the lock member, so that the lock member moves inward to lock the lock member. The engagement of the member side engaging portion with the switch body side engaging portion is released to 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 body, the lock member is operated to unlock the rotary cam, and then the key rotates the rotary cam to operate the switch section. It is to operate the section.

Therefore, when the key is not used, there is vibration, and even if something is accidentally inserted into the key switch body, the rotary cam is prevented from being rotated, and it is 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.

Further, by forming a guide surface portion on the outer peripheral edge of the peripheral surface portion of the lock member and providing an operating portion at the tip of the key for moving the lock member by contacting the guide surface portion, When the key is inserted, the key surely interferes with the lock member, and the lock can be reliably released.

There is a pair of the lock members, and the elastic member urges the pair of lock members outward to engage the lock member side engaging portion with the switch body side engaging portion in a disengageable manner. When the key simultaneously unlocks the pair of lock members, stable unlocking and rotation operation of the rotary cam can be performed, and stable switch unit operation can be performed.

Further, the key is an insertion bar portion which interferes with the lock member when the key is inserted into the key switch body, and the rotation of the insertion bar portion following the interference of the insertion bar portion with the lock member. Since it has the contact bar portion that interferes with the cam, the switch portion can be operated 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 front view of a key insertion port of a head portion of the key-operated switch.

FIG. 4 is an exploded perspective view of a mechanical portion of a head portion of the key-using switch.

FIG. 5 is an explanatory diagram of a locked state of the rotary cam in the head portion of the key-operated switch.

FIG. 6 is an explanatory view of a lock release state of the rotary cam in the head portion of the key-operated switch.

FIG. 7 is an operation explanatory diagram of an initial state of key insertion in the head portion of the key type switch.

FIG. 8 is an operation explanatory diagram of a key insertion state in a head portion of the key type switch.

FIG. 9 (1) is a perspective view of a key. (2) is (1)
It is sectional drawing which follows the AA line.

[Explanation of symbols]

 1 Key Switch Main Body 4 Switch Part 6 Switch Operating Part 10 Key 15 Rotating Cam 16L, 16R Locking Member 17 Spring 20, 21 Cam Operating Part 22 Cam Part 23 Bearing Hole 24 Engaging Protrusion (Locking Part Engaging Part) 26 Guide Surface portion 28 Support shafts 30a, 30b Lock hole portion (switch body side engaging portion) 35 Actuating portion

 ─────────────────────────────────────────────────── ─── 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 section, a switch operating section for opening and closing the switch section, and a switch main body side engaging section, and a key switch rotatably provided in the key switch main body. A rotary cam having a cam operating portion that interferes with a key inserted into the main body, a cam portion circumscribing the switch operating portion, and a lock member storing hole portion; and a lock member storing hole portion of the rotary cam. A lock member movably and non-rotatably provided in the axial direction of the lock member housing hole and having a lock member side engaging portion on the outside, and the lock member side engaging member for urging the lock member outward. An elastic member that releasably engages the joint portion with the switch body side lock portion; and an insertion of the key portion into the key switch body to interfere with the lock member so that the lock member resists the elastic member. A key for moving the lock member side engagement portion to disengage the lock body side engagement portion from the switch body side lock portion and interfering with the cam operating portion of the rotary cam to rotate the rotary cam. Characteristic key use type switch. 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. A guide surface portion is formed on an outer peripheral edge portion of a peripheral surface portion of the lock member, and an operating portion for contacting the guide surface portion and moving the lock member is provided at a tip end portion of the key. Alternatively, the key-operated switch according to claim 2. 4. The lock member has a pair, and the elastic member biases the pair of lock members outward to engage the lock member side engaging portion with the switch body side locking portion in a disengageable manner. The key-using switch according to claim 1, 2 or 3, wherein the key simultaneously unlocks a pair of the lock members. 5. The insertion bar portion which interferes with the lock member when the key is inserted into the key switch body, and the rotation of the key following the interference of the insertion bar portion with the lock member. The key use type switch according to claim 1, 2 or 3 or 4, further comprising a contact bar portion that interferes with the cam.