JP2016062727A - Enable switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an enable switch of 3 positions which allows for more rapid cancellation of electrification state, at the moment of further push-in of a push button from an enable position.SOLUTION: In an enable switch 1 where a push button 3 is built in a contact base 2 so that it can be pushed from a first position to a third position via a second position as an enable position, when the push button 3 is pushed from the second position into the third position, a reciprocal movable base 30 is pushed up from a normal position to an emergency position, by a protrusion 32 provided on the contact base 2, a jerk mechanism 35 is actuated to jerk the reciprocal movable base 30 to the emergency position, and a movable contact 45 in contact with a fixed contact 15 is separated to cancel electrification state.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an enable switch suitable for use in, for example, a pendant switch of a crane or a hoist, a remote control box of various devices, a robot, a machine tool, and the like, and in particular, an off-on-off three-position operation is possible. It relates to an enable switch.

For example, when operating a crane or a hoist, it is common for an operator to work while approaching a load while operating a pendant switch.
The enable switch can operate the crane and hoist only when the switch is on, and when the switch is turned off against the abnormal operation of the crane and hoist, the crane and hoist will stop operating. It has become a means of work.

  As a conventional enable switch, a push button switch that is turned on while being pressed and turned off when the hand is released is used. If you release your finger or release the pendant switch during work, the crane And the hoist had the function of stopping.

However, the operator may push the push button further against the abnormal operation of the crane or hoist.
In view of this, a three-position enable switch has been proposed that stops when the hand is released and stops when the hand is pushed in (see, for example, Patent Document 1).
The function of the switch is defined as Japanese Industrial Standards (JIS C8201-5-8: 2009), and is also recommended for use in the “Guidelines for Comprehensive Safety Standards for Machinery” of the Ministry of Health, Labor and Welfare.

JP 2006-244853 A

  The enable switch according to Patent Document 1 is configured such that a push button is incorporated into a contact base provided with a fixed contact so that it can be pushed from the first position to the third position through the second position which is the enable position. A swing lever pivotally attached to the lower part of the push button so as to support the movable contact away from the fixed contact side against the contact spring, and lowers with the push button to bring the movable contact into contact with the fixed contact And a protrusion that pushes the swing lever in contact with the lower portion of the swing lever when the push button is pushed beyond the contact closing position (second position), and the push button is released (first In the position), the swing lever is turned off by supporting the movable contact, and in the state where the push button is pushed in one step (second position), the swing lever is lowered to the position of the fixed contact. Thus, when the push button is pushed in two steps (third position), the protrusion pushes up the swing lever, so that the swing lever can be turned off by pulling the movable contact away from the fixed contact. .

  The enable switch according to Patent Document 1 can also achieve the intended purpose, but the 3-position enable switch that can quickly release the energized state at the moment when the push button is further pushed from the enable position. Has come to be desired.

  In view of the circumstances as described above, an object of the present invention is to provide a three-position enable switch that can quickly release the energized state at the moment when the push button is further pushed from the enable position.

  In order to achieve the above object, an enable switch according to the present invention is an enable switch in which a push button is incorporated into a third position through a second position which is an enable position from a first position to a contact base provided with a fixed contact. In the switch, the reciprocation is incorporated in the push button so as to be able to reciprocate between a normal position facing the push button in the push button and an emergency position pushed up from the normal position to the opposite side of the push button by a predetermined distance. Movable base, quick moving mechanism for suddenly moving the reciprocating movable base to an emergency position, a movable contact disposed on the reciprocating movable base, and a reciprocating movable base when the push button is pushed from the second position to the third position And a protrusion provided on the contact base so as to be able to push up from the normal position toward the emergency position, and when the push button is pushed from the first position to the second position, When the movable contact disposed on the reciprocating movable base at the normal position contacts the fixed contact of the contact base to be energized, and the push button is further pushed from the second position to the third position, the contact base is provided. As the reciprocating movable table is pushed up from the normal position to the emergency position by the protrusion, the reciprocating movable table is suddenly moved to the emergency position by the operation of the quick moving mechanism, so that the movable contact that has been in contact with the fixed contact is It is characterized in that the energized state is released away.

  In this case, the quick moving mechanism urges the abutting member incorporated in the reciprocating movable table so as to be able to abut on the inner surface of the push button along the reciprocating path of the reciprocating movable table, and the abutting member to press the inner surface of the push button. A spring member, and a peak portion projecting from the inner surface of the push button so that the contact member gets over when the reciprocating movable table is pushed up from the normal position toward the emergency position. When the abutment member climbs over the mountain part, it is made to reciprocate by acting on the slope of the mountain part via the abutment member. The movable platform can be moved up to the emergency position.

  Further, an auxiliary contact can be provided in which the contact is closed when the push button is in the third position.

  According to the enable switch of the present invention, when the push button is pushed from the second position, which is the enable position, to the third position, the reciprocating movable base is pushed up from the normal position toward the emergency position by the protrusion provided on the contact base. Accordingly, the reciprocating movable base is suddenly moved to the emergency position by the action of the sudden movement mechanism, and the movable contact is instantly separated from the fixed contact, so that the energized state is released more quickly when the push button is pushed further from the enable position. can do.

  The quick moving mechanism includes a contact member that is incorporated in the reciprocating movable base so as to be able to contact the inner surface of the push button along the reciprocating path of the reciprocating movable base, and a spring member that urges the contact member to press the inner surface of the push button. And a ridge protruding from the inner surface of the push button so that the abutting member gets over when the reciprocating movable table is pushed up from the normal position toward the emergency position, and when the abutting member gets over the ridge When the abutting member climbs over the mountain part, the accumulated energy stored in the spring member is applied to the slope of the mountain part via the abutting member so that the reciprocating movable base By jumping up to the emergency position, the reciprocating movable base can be suddenly moved to the emergency position with a simple structure.

  In addition, by providing an auxiliary contact that closes the contact when the push button is in the third position, it is possible to identify in which of the three positions the push button is located.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view which shows the enable switch which concerns on one Embodiment of this invention, (a) is a front view, (b) is a right view, (c) is a top view, (d) is a bottom view. It is the sectional view on the AA line of Fig.1 (a). It is a disassembled perspective view of the enable switch. It is operation | movement explanatory drawing at the time of pushing operation of a pushbutton, (a)-(c) is the sectional view on the AA line of Fig.1 (a), (d)-(f) is B- of Fig.1 (b). FIGS. 5A and 5B are cross-sectional views taken along line B, where FIGS. 4A and 4D show the push button in the first position, FIGS. 4B and 4E show the push button in the second position, and FIGS. Is in the third position. It is operation | movement explanatory drawing at the time of a return of a pushbutton, (a)-(c) is the sectional view on the AA line of Fig.1 (a), (d)-(f) is BB of FIG.1 (b). It is a sectional view of a line, (a) and (d) is a figure showing the return process from the 3rd position of a pushbutton to the 2nd position, (b) and (e) are from the 2nd position of a pushbutton to the 1st position. The figure which shows a return process, (c) And (f) is a figure which shows after the return to the 1st position of a pushbutton. (A)-(c) is CC sectional view taken on the line of FIG.1 (b), and is operation | movement explanatory drawing of a click mechanism, (d)-(f) is DD sectional view taken on the line of FIG.1 (b). FIG. 6 is an explanatory diagram of the auxiliary contact operation, wherein (a) and (d) are when the push button is in the first position, (b) and (e) are when the push button is in the second position, and (c) and (f). Is when the push button is in the third position. It is a disassembled perspective view which shows an example which incorporates the enable switch in a pendant switch. It is a disassembled perspective view which shows the other example which incorporates the enable switch in a pendant switch.

  Next, an embodiment of the enable switch of the present invention will be described based on the drawings.

<Overview of enable switch>
An enable switch 1 shown in FIGS. 1A to 1D is used by being incorporated in a pendant switch equipped in, for example, a crane or a hoist, and includes a contact base 2 and a push button 3. , Off-on-off three-position operation is possible.

<Description of the contact point>
As shown in FIG. 3, the contact base 2 has a box-shaped structure, and a push button accommodating portion 4 that accommodates the push button 3 so as to be slidable up and down is formed in the center, and the left and right are The left and right mounting flanges 5 are formed so as to project to the left and right, and the left and right side flanges are formed with a pair of left and right contact fitting mounting portions 6 so as to project to the left and right below the mounting flange 5, and the contact points A similar pair of left and right contact metal fittings 6 ′ is formed so as to be positioned on the rear side of the metal fittings 6.

As shown in FIG. 1 (b), in the contact base 2, a first through hole 7 penetrating left and right is formed in a portion between the left and right mounting flanges 5 and the pair of front left and right contact fitting mounting portions 6. Similarly, a second through hole 8 penetrating left and right is formed at a portion between the left and right mounting flanges 5 and the pair of left and right contact fitting mounting portions 6 'on the rear side.
A stopper 9 having a predetermined thickness integrated with the mounting flange 5 is formed on the lower surfaces of the left and right mounting flanges 5 facing the pair of left and right contact fitting mounting portions 6 'on the rear side.

<Description of fixed contact>
As shown in FIG. 3, a fixed contact base 11 for an auxiliary contact is fastened and fixed to the pair of front left and right contact metal fittings 6 by terminal screws 13, and the pair of left and right contact metal fittings 6 on the rear side. A fixed contact base 12 for main contact is similarly fastened and fixed to the terminal by a terminal screw 13.
The auxiliary contact fixed contact base 11 is fixed with an auxiliary contact fixed contact 14 made of a metal contact rivet having excellent conductivity, and the main contact fixed contact base 12 is similar. Thus, the fixed contact 15 for the main contact is fixed.
In this example, the two fixed contact bases 11 and 12 arranged side by side on the right side of the contact base 2 are connected to the energized state by the short-circuit plate 16.

<Description of push button>
The push button 3 is slidably inserted vertically into the push button housing portion 4 while being urged upward by a push button return spring 17 disposed forward and backward in the push button housing portion 4 of the contact base 2. The contact base 2 can be pushed from the first position when the push button 3 is not pushed to the third position where the push button 3 is completely pushed through the second position where the push button 3 is pushed to the intermediate position which is the enable position. Built in.

In the middle of the push button 3 in the front-rear direction, there is formed a reciprocating movable base accommodating portion 18 having a required accommodating space that is closed at the top and opened to the left and right and below.
A guide hole 19 is formed in the upper part of the push button 3 so as to be not penetrated with a required depth dimension upward from the top surface of the reciprocating movable table accommodating portion 18.
At the front part of the push button 3, a spring accommodating part 20 having a required accommodating space that is open to the left and right while being closed at the upper and lower parts is formed.

<Description of push button click mechanism>
The enable switch 1 includes a click mechanism that provides a click feeling when the push button 3 is pushed in so that the user can recognize the first, second, and third positions of the push button 3. 21 is equipped.
The click mechanism 21 mainly includes a steel ball 22 arranged on the left and right, a spring member (compression coil spring) 23, an upper step portion 24, and a lower step portion 25.

The left and right steel balls 22 and the spring member 23 are respectively incorporated in through holes 26 formed in the left and right direction at the rear part of the push button 3, and the left and right steel balls 22 are attached to the push button 3 by the urging force of the spring member 23. It can be pressed against the inner surface of the push button accommodating portion 4 along the reciprocating path of the first, second and third positions.
The upper step portion 24 is formed symmetrically on the inner surface of the push button housing portion 4 so as to engage with the pair of left and right steel balls 22 when the push button 3 is in the first position, and the lower step portion 25 is The push button 3 is symmetrically formed on the inner surface of the push button accommodating portion 4 so as to engage with the pair of left and right steel balls 22 when the push button 3 is in the second position.

  In the click mechanism 21, when the push button 3 is pushed from the first position to the second position, the left and right steel balls 22 are clicked by the so-called rotational friction principle so as to get over the upper stepped portion 24. When the push button 3 is pushed from the second position to the third position, the left and right steel balls 22 try to get over the lower step 25 and a click feeling is generated.

<Description of reciprocating movable table>
A reciprocating movable base 30 is incorporated in the reciprocating movable base accommodating portion 18 so as to be slidable up and down.
The reciprocating movable table 30 includes a movable table main body 30a and a guide rod portion 30b provided integrally with the upper surface of the movable table main body 30a. The guide rod 30b is inserted into the guide hole 19 of the push button 3. The movable base main body 30 a is housed in the reciprocating movable base accommodating part 18.
The reciprocating movable table 30 is an emergency position that is pushed up by a predetermined distance from the normal position facing the push direction of the push button 3 to the push direction of the push button 3 by the guide hole 19 and the guide rod portion 30b. Smooth reciprocation between positions.
The movable base main body 30a is formed with a spring accommodating portion 31 having a required accommodating space that is open to the left and right while the upper and lower portions are closed.

<Description of protrusions that push up the reciprocating movable table>
As shown in FIG. 2, a protrusion 32 projects from the bottom surface of the push button accommodating portion 4 in the contact base 2 so as to face the reciprocating movable base 30 (movable base main body 30 a). When being pushed from the second position to the third position, the reciprocating movable base 30 is pushed up by the protrusion 32 from the normal position toward the emergency position.

<Explanation of rapid mechanism>
The enable switch 1 is equipped with a quick moving mechanism 35 that rapidly moves the reciprocating movable table 30 to the emergency position.
The rapid moving mechanism 35 is mainly composed of a steel ball 36 (corresponding to the “abutting member” of the present invention), a spring member (compression coil spring) 37, and a mountain portion 38 disposed in the front and rear direction.

The front and rear steel balls 36 and the spring members 37 are respectively incorporated in through holes 39 formed in the front-rear direction at the lower part of the movable base main body 30 a, and the front and rear steel balls 36 are moved by the urging force of the spring members 37. The reciprocating movable table 30 can be pressed against the inner surface of the reciprocating movable table accommodating portion 18 along the reciprocating path of the reciprocating movable table 30.
The mountain portion 38 is formed symmetrically on the inner surface of the reciprocating movable base accommodating portion 18 so that the front and rear steel balls 36 get over when the reciprocating movable base 30 is pushed up from the normal position toward the emergency position.

  In the rapid motion mechanism 35, when the front and rear steel balls 36 get over the mountain portion 38, the spring member 37 is compressed via the front and rear steel balls 36 so that the spring member 37 can store the stored energy. When the front and rear steel balls 36 get over the mountain portion 38, the stored force stored in the spring member 37 is applied to the slope 38 a on the upper side of the mountain portion 38 via the front and rear steel balls 36 to make the reciprocating movable table 30 emergency. The reciprocating movable table 30 can be suddenly moved to the emergency position with a simple structure.

<Description of movable contact>
A movable contact base 40 for auxiliary contacts is incorporated in the front portion of the push button 3, and a movable contact base 41 for main contacts is incorporated in the reciprocating movable base 30.

As shown in FIGS. 2 and 1 (b), the movable contact base 40 for the auxiliary contact is a pair of front left and right disposed on the contact base 2 in a state of passing through the spring accommodating portion 20 of the push button 3. It is arranged in the first through-hole 7 of the contact base 2 so as to straddle the fixed contact 14 and is downwardly pressed so as to press the bottom surface of the spring housing portion 20 by a spring member (compression coil spring) 42 incorporated in the spring housing portion 20. Is being energized.
Further, the movable contact base 41 for the main contact extends over the pair of left and right fixed contacts 15 disposed on the contact base 2 in a state of passing through the spring accommodating portion 31 of the movable body 30a. It is arranged in the second through hole 8 of the contact base 2 and is incorporated in a state of being biased downward so as to press the bottom surface of the spring accommodating part 31 by a spring member (compression coil spring) 43 incorporated in the spring accommodating part 31. It is.

  As shown in FIG. 3, movable contact 44 for auxiliary contact made of a metal contact rivet having excellent conductivity is caulked and fixed to both ends of movable contact base 40 for auxiliary contact. Similarly, the movable contact 45 for the main contact is fixed to both ends of the movable contact base 41 for use.

<Description of switching operation>
The switching operation associated with the operation of the push button 3 of the enable switch 1 configured as described above will be described below mainly with reference to FIGS.

<Description of main contact operation>
As shown in FIGS. 4 (a) and 4 (d), when the push button 3 is in the first position, the reciprocating movable table 30 stands by at the normal position. At this time, the movable contact 45 and the fixed contact 15 are separated from each other. The main contact 50, which is separated and composed of these contacts 15, 45, is open.
As shown in FIGS. 4B and 4E, when the push button 3 is pushed to the second position which is the enable position, the reciprocating movable base 30 is pushed together with the push button 3 while waiting at the normal position. The reciprocating movable table 30 is lowered to a position where it comes into contact with the protrusion 32, and the movable contact 45 contacts the fixed contact 15 and the main contact 50 closes.
As shown in FIGS. 4C and 4F, when the push button 3 is further pushed from the second position to the third position, the reciprocating movable base 30 is pushed up from the normal position toward the emergency position by the protrusion 32. .
At this time, as shown in FIG. 2, when the front and rear steel balls 36 get over the mountain portion 38, the spring member 37 is compressed via the front and rear steel balls 36, and a stored energy is stored in the spring member 37. When the front and rear steel balls 36 get over the mountain portion 38, the accumulated force stored in the spring member 37 acts on the slope 38a on the upper side of the mountain portion 38 via the front and rear steel balls 36, and the reciprocating movable table 30 is moved. It is jumped up to the emergency position and suddenly moved.
In this way, due to the sudden movement in which the reciprocating movable table 30 suddenly moves to the emergency position, the movable contact 45 is instantaneously separated from the fixed contact 15 and the main contact 50 is opened as shown in FIG.

As shown in FIGS. 5A to 5C, when the hand is released from the push button 3, the push button 3 is automatically moved from the third position to the first position by the action of the push button return spring 17. Will return.
As shown in FIGS. 5A and 5D, in the process in which the push button 3 returns from the third position to the second position, the reciprocating movable table 30 is raised together with the push button 3 in the initial stage. Is positioned at the second position, the movable contact base 41 disposed on the reciprocating movable base 30 collides with the stopper portion 9 of the contact base 2, and the ascending operation of the reciprocating movable base 30 is stopped.
As shown in FIGS. 5 (b) and 5 (e), in the process in which the push button 3 returns from the second position to the first position, the stopper portion 9 moves the reciprocating movable table 30 through the movable contact base 41. While the raising operation is stopped, the push button 3 continues to rise as it is, so that the reciprocating movable base 30 is lowered relative to the push button 3, and the reciprocating movable base 30 moves from the emergency position toward the normal position. To do.
As shown in FIGS. 5C and 5F, when the push button 3 is completely returned to the first position, the reciprocating movable base 30 is returned to the normal position.

<Description of auxiliary contact operation>
As shown in FIGS. 6D and 6E, when the push button 3 is in the first position and the second position, the movable contact 44 and the fixed contact 14 are separated from each other. The auxiliary contact 51 constituted by is open.
As shown in FIG. 6 (f), when the push button 3 is pushed to the third position, the movable contact 44 contacts the fixed contact 14 and the auxiliary contact 51 is closed.

<Description of push button position identification>
As shown in FIGS. 4D and 6D, when the push button 3 is in the first position, both the main contact 50 and the auxiliary contact 51 are open. If there is no energization signal, it can be identified that the push button 3 is in the first position.

  As shown in FIGS. 4E and 6E, when the push button 3 is in the second position, the main contact 50 is closed while the auxiliary contact 51 remains open. On the other hand, if there is no energization signal of the auxiliary contact 51, it can be identified that the push button 3 is located at the second position.

  As shown in FIG. 4 (f) and FIG. 6 (f), when the push button 3 is in the third position, the main contact 50 is opened while the auxiliary contact 51 is closed, so there is no energization signal for the main contact 50. On the other hand, if there is an energization signal of the auxiliary contact 51, it can be identified that the push button 3 is located at the third position.

  Thus, by providing the auxiliary contact 51 that closes the contact when the push button 3 is in the third position, it is possible to identify which of the three positions the push button 3 is located.

As shown in FIGS. 6A to 6B, when the push button 3 is pushed from the first position to the second position, the steel ball 22 tries to get over the stepped portion 24 on the upper side, and a click feeling is generated. Therefore, the user can recognize that the push button 3 has been pushed from the first position to the second position.
Further, as shown in FIGS. 6B to 6C, when the push button 3 is pushed from the second position to the third position, the steel ball 22 tries to get over the lower step portion 25 and a click feeling is generated. Therefore, the user can recognize that the push button 3 has been pushed from the second position to the third position.

<Description of effects>
According to the enable switch 1 of the present embodiment, when the push button 3 is pushed from the second position to the third position, the reciprocating movable base 30 is moved from the normal position to the emergency position by the protrusion 32 protruding from the contact base 2. As the push-up mechanism 35 is pushed up, the reciprocating movable table 30 is suddenly moved to the emergency position by the operation of the quick-action mechanism 35, and the movable contact 45 is instantaneously separated from the fixed contact 15. Therefore, the push button 3 is moved from the enable position (second position). Furthermore, the energized state can be released more promptly at the moment of pressing.

The enable switch 1 is compactly unitized by adopting a configuration in which the reciprocating movable base 30 or the like is incorporated in the push button 3 and the push button 3 is incorporated in the contact base 2, so that it can be easily assembled to various types of pendant switches. it can.
For example, in the pendant switch 60 as shown in FIG. 7, the enable switch 1 can be mounted on the top of the pendant switch 60 by sharing the mounting structure with the other switches 61, as shown in FIG. As described above, a free layout according to ease of use, such as mounting the enable switch 1 at the bottom, is possible.

  The enable switch of the present invention has been described based on one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the configuration is appropriately changed without departing from the spirit of the present invention. It is something that can be done.

  Since the enable switch of the present invention has a characteristic that the energized state can be released more quickly at the moment when the push button is further pushed from the enable position, various three positions including cranes and robots are available. It can be used suitably for the use of the enable switch.

1 Enable switch 2 Contact block 3 Push button 14 Fixed contact (for auxiliary contact)
15 Fixed contact (for main contact)
30 Reciprocating movable table 32 Projection 35 Rapid moving mechanism 36 Steel ball (contact member)
37 Spring member 38 Mountain part 44 Movable contact (for auxiliary contact)
45 Movable contact (for main contact)
50 Main contact 51 Auxiliary contact

Claims (3)

  In an enable switch in which a push button is incorporated into a third position through a second position which is an enable position from a first position to a contact base on which a fixed contact is disposed, the push button is moved toward the push direction of the push button inside the push button. The reciprocating movable base incorporated in the push button so as to be able to reciprocate between the normal position and the emergency position pushed up a predetermined distance in the opposite direction of the push button from the normal position, and the reciprocating movable base suddenly moved to the emergency position. A quick-acting mechanism to be moved, a movable contact disposed on the reciprocating movable base, and a contact base capable of pushing the reciprocating movable base from the normal position toward the emergency position when the push button is pushed from the second position to the third position. When the push button is pushed from the first position to the second position, the movable contact disposed on the reciprocating movable base at the normal position is When the push button is further pushed from the second position to the third position by contacting the constant contact and energizing, the reciprocating movable table is pushed up from the normal position toward the emergency position by the projection provided on the contact table. Accordingly, the enable switch is configured to release the energized state by moving the reciprocating movable table suddenly to the emergency position by the operation of the rapid moving mechanism, so that the movable contact contacting the fixed contact is separated.   The quick moving mechanism includes a contact member that is incorporated in the reciprocating movable table so as to be able to contact the inner surface of the push button along the reciprocating path of the reciprocating movable table, and a spring member that urges the contact member to press the inner surface of the push button. And a ridge protruding from the inner surface of the push button so that the abutting member gets over when the reciprocating movable table is pushed up from the normal position toward the emergency position, and a spring when the abutting member gets over the ridge When the member accumulates the accumulated force and the contact member gets over the mountain, the accumulated force stored in the spring member acts on the slope of the mountain via the contact member to 2. The enable switch according to claim 1, wherein the enable switch jumps to a position.   3. The enable switch according to claim 1, further comprising an auxiliary contact configured to close the contact when the push button is in the third position.

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