KR970001842Y1 - Push switch for auto cut-off - Google Patents

Abstract

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Description

Auto shut off push switch

1 to 6 are views showing the configuration and operation of the conventional push switch,

1 is an exploded perspective view of a conventional push switch.

2 is a partial cross-sectional view of a conventional push switch.

Figure 3 (a) (b) is a plan view of a conventional push switch.

Figure 4 is a partial perspective view showing the configuration of the movable cam and the push pin.

5 is an explanatory view of the operation of the movable cam and the push pin.

6 is a development view of the movable cam.

7 to 12 are views showing the configuration and operation of the automatic power off type push switch developed in advance of the present invention,

7 is a full exploded perspective view.

8 is a coupled state plan view.

9 is a partially enlarged plan view.

(A) (b) is a longitudinal cross-sectional view which showed the action, (a) shows the state which a switch was connected, and (b) shows the state which a switch was disconnected.

(A) and (b) is a partially enlarged sectional view showing a state in which a switch is connected and disconnected.

12 is a perspective view showing the configuration of the movable cam and the cam pin.

13 is a perspective view showing a modification of the automatic unlocking means.

14 is a perspective view showing another modification of the automatic unlocking means.

Figure 15 is an exploded perspective view showing the configuration of the automatic power off type push switch using a shape memory alloy according to the present invention.

Figure 16 is a cross-sectional view of the main part of the automatic power off type push switch using the automatic power off type using the shape memory alloy according to the present invention.

＊ Explanation of symbols for main parts of drawing

1 knob 2 cover

3: working spring 4: moving slider

4a: Operation Cam 5: Case

7: pin spring 8: contact

9: movable contact plate 10: operating spring plate

11: working arm 12: fixed terminal

13: center terminal 16: solenoid

19: cam pin 20: shape memory alloy spring

21: general spring

The present invention relates to an automatic power off type push switch. In particular, the switch can be locked and unlocked by manual operation, and also has a structure that obtains an automatic unlocking force by a shape memory alloy. The present invention relates to an automatic power-off type push switch using an automatic power-off type using a shape memory alloy to improve reliability by simplifying and miniaturizing and simplifying the assembly process and enabling more reliable operation.

First, the conventional self-locking push switch will be described first with reference to FIGS. 1 to 6, and the conventional automatic power-off type push switch can be classified into four types as follows.

First, there is an exterior that fixes and supports the entire parts. The exterior portion has a knob 1, a cover 2 and a case 3.

Secondly, there is a locking device and a movable part for opening and closing the contact and the contact which enable the push lock and the lock release operation in the case 3.

Third, there is a contact portion for opening and closing the contact by the push pin 15 in the movable slider 4.

Then, when the fourth movable slider 4 is locked, there is a solenoid operating portion for automatically releasing the lock by an external electric signal.

The cover 2 serves to fix the case 3 and to support the movable slider 4.

The case 3 is provided with a guide portion 3a, a solenoid mounting portion 3b, a movable slider insertion portion 3c and a support hole 3d.

The movable portion includes a movable slider 4 having a groove 4a, a spring insertion groove 4b, a knob coupling portion 4c, and a lower insertion groove 4d, a support pin 5a, a guide groove 5b, and a movable portion. The cam surface 5c is formed and inserted into the movable slider 4, the cam pin 6 serving as a cam and the cam pin 6 serving as a stopper of the movable cam 5, and the cam pin 6 are movable cam ( 5) The pressing plate spring 13 is pushed so as to be in contact with the bottom surface of the case 5, and the pressing plate spring 13 is fixed to a predetermined portion of the case 3, and the contact portion is opened and closed. The main body consists of a push pin 15 and a push pin spring 16 for pushing the push pin 15, and the push pin through ring 16 has a lower insertion groove 4d formed on the lower surface of the movable slider 4; It is inserted in.

The contact portion is mounted on the fixed contact terminal 9 fixed to the bottom surface of the case 3, the center support terminal 8 for supporting the movable contact plate 7, and the projection 8a of the center support terminal 8 to insert the groove. (7b) is coupled to the movable contact plate (7) for opening and closing movement of the seesaw operation, the lower end of the round pin of the push pin 15 by the push lock operation of the movable slider (4) By sliding back and forth, the contact 7a of the movable contact plate 7 and the fixed contact 9a of the fixed contact terminal 9 are brought into contact with or separated from each other so that the contacts are turned on and off.

This solenoid operation part is coupled to a solenoid 11 with an input terminal 11a coupled to one side solenoid mounting portion 3b of the case 3, and an iron core 11b capable of obtaining suction force in the center hole of the solenoid 11 is provided. The cam support plate 10 is inserted into the guide portion 3a of the case 3, and the cam support plate 10 supporting the movable cam surface 5c is inserted into the one end portion 10a, which is bent in an L shape, and the cam support plate 10 and the iron core ( The spring 11c which pushes the cam support plate 10 is inserted between 11b).

In the conventional push switch as described above, when the knob 1 is pushed in the coupled state as shown in FIGS. 2 and 3 (a), the movable slider 4 engaged with the knob 1 is pushed together and the movable slider 4 The movable cam 5, which is fitted into the groove 4a of the support plate 5a, is pushed together.

Then, one end of the movable cam 5 is inserted into the guide groove 5b and the other end of the cam pin 6 inserted into the support hole 3d of the case 3 is always on the bottom of the guide groove 5b. The contact pin spring 13 is always pressed downward by the wing 13a of the leaf spring 13 so that the cam pin 6 is interlocked as the movable cam 5 is pushed.

Hereinafter, the locking and unlocking operation by the movable cam 5 and the cam pin 6 will be described. As shown in FIGS. 4 to 6, the guide groove 5b of the movable cam 5 is described. Since the bottom is composed of stepped and inclined surfaces according to each operation section, when the movable cam 5 is pushed, the end of the cam pin 6 is pushed up along the guide groove 5b to be pushed up to ABCD. When it is removed, the movable slider 4 tries to protrude again by the restoring force of the automatic spring 12 inserted into the spring insertion groove 4b, and the movable cam 5 also protrudes forward, at this time, the guide groove 5b. Cam pin (6) in the corner of D side is trying to push back again, but because there is a step, it does not go to C side but falls to E through the wall surface. The cam pin 6 remains locked.

When the knob 1 is pushed again to release the lock in this state, the movable cam 5 is pushed forward again. The cam pin 6 does not go to D by the step of the guide groove 5b but falls to the F plane along the wall. They are pushed to the corner. At this time, if the force pushing the knob 1 is removed, the cam pin 6 does not go back to E by the step but moves along the inclined plane G. The lock A is dropped off the A plane.

Hereinafter, the automatic lock release function will be described. In the locked state as described above, the movable cam 5 is supported by the cam support plate 10 and stopped as shown in FIG. 5 to maintain the locked state. When the cam support plate 10 is pulled toward the iron core 11b when the solenoid 11 is attracted to the solenoid 11, the movable cam surface 5c is out of the one end 10a of the cam support plate 10. As shown in (b) of FIG. 3, the cam pin 6 is disengaged from the lock portion as the support pin 5a is twisted about the lock pin. (The shape and step of the movable cam described in FIG. 3 and the movable cam described above are shown in reverse, but the operation principle is the same)

And, as shown in FIG. 2, the contact part operation is moved while the push pin 15 coupled to the movable slider 4 slides on the movable contact plate 7 as the movable slider 4 moves forward and backward. When 4) is locked, the push pin 15 is pushed inward from the center of the center support terminal 8 while being pushed by the push pin spring 16 and pushes the movable contact 7a and the fixed contact 9a. ) Is connected in the on state and the movable slider 4 is unlocked, so that the contact pins are separated from each other and turned off because the push pin 15 presses the movable contact plate 7 outside the center support terminal 8.

As described above, the conventional push switch has a very complicated operation structure and requires too many parts, so that the overall assembly performance is not good, thereby increasing the assembly cost. In addition, if the accuracy of each part does not match completely, the operation of the push lock may be unstable, and an abnormality may occur in the automatic unlocking function, which may prevent the smooth operation.

In addition, in the conventional push switch, even if the contact on and off states of each part (push pin, push spring, movable contact plate, center terminal, etc.) do not match a little, the contact force depends on the anxiety of the contact, in particular the pushing force of the knob when the contact is on. Low contact force results in electrical sparking of the contact due to contact instability, which can lead to a rise in contact temperature and poor contact welding, which can be fatal to the set and can be a fire hazard.

In addition, the conventional push switch has a contact portion at the bottom of the movable slider, the operation spring is embedded in the rear foot, and the cam is embedded on the movable cam on top of the movable cam. In addition, the conventional push switch is very difficult to make a semi-finished assembly at the time of assembly, since most of the main line has to be assembled at a time at a time, the main line is very long and it is technically difficult to automate, thereby reducing the assembly cost.

Summarizing the deficiencies of the conventional push switch as described above, first, there are many required parts. Second, each part should be very good. Third, the assembly process is very difficult and structural failure is likely to occur. Fourth, the reliability of the contact by operation is weak. Fifth, since the shape of the product should be large, it is difficult to reduce the thickness and thinness (輕薄 單 小). Sixth, semi-finished product assembly is difficult, automation is difficult, and the main line is long. Seventh, assembly cost and manufacturing cost is very high.

The prior art Applicant has devised to solve the above-mentioned conventional defects, and is removably inserted into the case protected by the cover so as to be movable back and forth, and formed in the groove formed in the lower portion of the movable slider to which the knobs are coupled in a single body. Inserting the operation spring providing both ends so as to contact the inner surface of the groove and the front surface of the case, and the fixed terminal and the center terminal is fixed to the bottom of the case to combine the movable contact plate, the operation spring plate and the operating arm to the center terminal The automatic power off type push switch using a shape memory alloy having an automatic lock release means operated by a solenoid has been devised prior to the present invention.

The automatic unlocking means includes, for example, a disc-shaped magnetic cam pin having an actuating cam formed on a side surface of the movable slider, and having a solenoid body, a fixed iron core, a coil terminal, and an inner surface protruding in a direction perpendicular to the movable slider. The magnetic cam pin is configured to lock and unlock the movable slider while moving in a direction perpendicular to the movable slider.

The prior art will be described in detail with reference to the accompanying drawings.

In addition, in the following description of the prior art, in order to facilitate the notation, the reference numerals given to the parts will be described from the first, regardless of the prior art.

(In this way, since the prior art push switches are clearly shown separately from FIGS. 7 to 14 unlike the prior art, there is no fear of confusing the prior art with the prior art.) Referring to FIG. 12, FIG. 7 is an overall exploded perspective view of the push switch according to the prior art, FIG. 8 is a coupled state plan view, FIG. 9 is a partially enlarged plan view, and FIG. 10 (a) (b ) Is a longitudinal cross-sectional view showing the configuration and operation, Figure 11 (a) (b) is a partial enlarged cross-sectional view showing a state in which the switch is connected and disconnected, respectively, as shown, automatic power off according to the prior art The type push switch has an external support for protecting and supporting the entire moving parts, a movable part coupled to the case to perform the overall operating lock and unlocking function, and a contact according to the forward and backward motion of the movable slider. , It consists of the contact portion and the lock is turned off automatically unlocking means for automatically released.

The exterior support portion includes a knob 1, a cover 2, and a case 5, as shown.

The case 5 is fixed and support each component, such as a contact operation unit, a solenoid described later, the cover 2 is a coupling structure required to protect the coupling is coupled to the case 5 and the switch is coupled to the set Knob 1 is fitted to the tip of the movable slider described later so that the user can press and actuate it when the switch is turned on and off.

The movable portion includes a movable slider 4 coupled to the knob 1 in an integral manner, an actuating spring 3 for counteracting the movable slider 4, and a movable slider 4 for locking and unlocking operation. The cam pin 6 and the pin spring 7 which pushes to operate in contact with the bottom face of the guide groove 4b of the cam cam 6 always operate | operate cam 4a.

An actuating cam 4a is formed at one side of the movable slider 4, and the actuating cam 4a is formed with a stepped portion and an inclined surface at the bottom of the guide groove 4b as in the prior art. The actuation spring 3 is inserted into a groove formed in the lower portion of the movable slider 4 as shown in FIG. 10 so that one end contacts the movable slider 4 and the other end contacts the front wall of the case 5 to enable the movable slider. (4) is pushing forward.

The contact part includes a fixed terminal 12 fixed to the bottom of the case 5, a movable contact plate 9 contacting and separating from the fixed terminal 12, and a central terminal 13 supporting and guiding the movable contact plate 9. ), An operation spring plate 10 and an operation arm 11 mounted on the central terminal 13 together with the movable contact plate 9 to open and close the contact.

The fixed terminal 12 and the central terminal 13 are fixed to the bottom surface of the case 5, the movable contact plate 9, the operating arm 11 and the operating spring plate 10 on the central terminal 13 is Are assembled.

The movable contact 8a is fixed to the movable contact plate 9, and the fixed contact 8b is fixed to the fixed terminal 12.

The automatic unlocking means includes a solenoid 16 main body, a coil terminal 17, a bobbin 14 wound with a coil, and a fixed iron core 15 inserted into a center hole of the bobbin 14 to become an electromagnet. The movable slider 4 is composed of a cam pin 6 and a pin spring 7 inserted between the actuating cam 4a and the fixed iron core 15.

The cam pin 6 is operated only in one direction because the actuating cam 4a of the movable slider 4 is stepped and inclined. The cam pin 6 is locked by pushing the knob 1 once and then again by a lock release function. Has At this time, the cam pin (6) is always pushed by the pin spring (7) so that the tip is always in contact with the bottom of the guide groove (4b) of the operation cam (4a), thereby preventing the step up. In addition, the cam pin 6 may flow in a right angle direction of the movable slider 4 by the guide wall 5a of the case 5, but is not moved in the movable direction as shown in FIG. It acts as a stopper.

In addition, the cam pin 6 is processed into a magnetic material that is easily sucked by the electromagnet so that the cam pin 6 is sucked when the fixed iron core 15 of the solenoid 16 is magnetized.

In forming the cam pin 6 from the magnetic material, the magnetic powder material can be sintered and molded.

That is, when power is applied to the solenoid 16, even if the cam pin 6 locks the operation cam 4a of the movable slider 4 by the suction force generated by the fixed iron core 15 of the solenoid 16, the cam pin ( The tip of 6) leaves the guide groove 4b of the actuating cam 4a and the lock is released. When the suction force is removed, the cam pin 6 is pushed back into the actuating cam 4a of the movable slider 4 by the elasticity of the pin spring 7. At this time, the suction force of the solenoid 16 should be greater than the elasticity of the pin spring (7).

The actuating spring 3 is inserted into a groove formed below the distal end of the movable slider 4 so as to be in contact with the inner surface of the groove of the movable slider 4 and the front wall of the case 5. After the operation spring (3) can be assembled in a later step, the assembly process is facilitated.

In the operation of the contact portion, as shown in Figs. 10 and 11, the actuating spring plate 10 is actuated so that the actuating spring plate 10 is turned on and off when passing through a dead point. Regardless of the operating speed and the force of the slider 4, the contact force and the restoring force of the contact are always constant.

The actuating spring plate 10 is a user pushes the movable slider 4 in the state of FIGS. 10B and 11A, and the front projection 4c of the movable slider 4 is actuated by the actuating spring plate 10. It is operated by pushing the jaw (10a) of the (), and when the jaw (10a) of the actuation spring plate 10 is moved to the milia actuation spring plate 10, one end of the actuation spring plate 10 is the center terminal 13 Back end received by the hinge point in contact with the movable contact plate 9 falls down because it is supported by the hinge point, and the movable contact plate 9 is supported by the operating arm 11 As shown in FIG. 11 (b), the plate 9 is moved toward the fixed terminal 12 as a whole so that the movable contact 8a and the fixed contact 8b are connected and the power is turned on.

When the lock is released, the movable slider 4 is pushed again, and the rear projection 4d of the movable slider 4 pushes the jaw 10a of the actuating spring plate 10 to the movable contact 8a and the fixed contact as opposed to the above action. The power is turned off as 8b is separated.

13 is a view showing a modification of the automatic unlocking means according to the prior art, as shown in the figure, it can be carried out by modifying the shape of the cam pin 6 to the U-shape, the operation cam (4a) and the cam The mounting position of the pin 6 can be on any of the up, down, left and right sides of the movable slider 4, but solenoids should be installed in the same direction at this time.

FIG. 14 shows another modification of the automatic unlocking means, in which the cam pin 4e is fixed to the movable slider 4, and the actuating cam 18 is separately manufactured and embedded in the guide wall 5a. Locking and unlocking operations are performed. At this time, the material of the working cam 18 should be formed of a magnetic material.

Prior art such as bawak described above can simplify the parts by pulling the cam pin directly to the solenoid when the automatic lock release, shorter stroke of the cam pin to obtain a greater suction force, accordingly the automatic unlocking function This makes it possible to improve reliability and reduce costs. In addition, each part can be made into a semi-finished assembly, which simplifies the mainline process for assembly and facilitates automatic assembly. In addition, the structure of the contact is improved as a stable contact structure without the rise of contact temperature, the poor welding of the contact, and the chattering caused by the repulsive force of the contact, which are frequently generated in the conventional see saw type contact opening and closing structure. Packaged so that the solenoid part can be easily disassembled, it can be used when the automatic lock release function is needed, and it can be separated and assembled when it is not necessary. There is an advantage.

As described above, the automatic power-off push switch according to the prior art is a power switch in which safety is important, and can be used for power opening and closing of home appliances such as washing machines, dishwashers, clothes dryers and kitchen appliances, and various industrial devices. When the set is operated by pressing the switch on for the first time, when the set is completed (for example, after washing), the power supply to the solenoid from the outer part (microcom) will cut off the whole set power by the suction force of the electromagnet. There is an advantage to be able to be safe.

However, the automatic power-off type push switch described in FIGS. 7 to 12 is designed to drive the cam pin 6 using the solenoid 16, which is complicated in construction, thus occupying a large installation area and miniaturizing it. It was disadvantageous, and there was a problem that the overall cost increases.

The present invention has been devised to solve the conventional defects as described above, so that the lock locking force is obtained by the shape memory alloy spring, so that the push switch can be miniaturized, simplified in assembly, and inexpensive. When described in detail by the accompanying drawings as follows.

FIG. 15 shows the configuration of the automatic power-off type push switch using the shape memory alloy according to the present invention, and is inserted into the case 5 protected by the cover 2 so as to be movable back and forth, and the knob 1 is Inserting the operation spring (3) for providing a restoring force to the groove formed in the lower portion of the movable slider (4) to be coupled to the soft body so that both ends contact the inner surface of the groove and the front surface of the case (5), the case (5) The fixed terminal 12 and the center terminal 13 is fixed to the bottom of the center terminal 13 to the movable contact plate 9, the operating spring plate 10 and the operating arm 11, the movable slider ( And an automatic lock release means for locking and releasing 4), wherein the automatic lock release means forms an actuating cam 4a on the side of the movable slider 4, and at a right angle to the movable slider 4; The cam pin 19 in a direction to lock the cam pin 19 The general spring 21 for moving to the side, and the shape memory alloy spring 20 for moving to the release side are provided.

As an example, the cam pin 19 has a shape in which the engaging portion 19a is formed in the middle portion, and the insertion portion 19b is formed at the distal end portion. In addition, the shape memory alloy spring 20 and the general spring 21, the shape memory alloy spring 20 together with the cam pin 19 to the mounting portion (2a) formed on the cover 2 (19a) ) Is coupled to the front part, and the general spring 21 is located to the rear part. In addition, both ends of the cam pin 19 are connected to +, − power lines 22 and 23 for heating by applying power.

The shape memory alloy spring 20 is made of a shape memory alloy in which no force is generated due to plastic deformation at room temperature, but the restoring force is generated when the temperature rises to a predetermined temperature and changes into a stored shape.

Other configurations of the present invention are the same as the embodiments described with reference to FIGS. 7 to 12.

The cam pin 19 has an actuating cam 4a of the movable slider 4 which is a stepped portion and an inclined surface, and is always operated in one direction. When the knob 1 is pushed once, the cam pin 19 is locked. . In addition, at room temperature where the cam pin 19 is not heated, the general spring 21 pushes the cam pin 19 forward so that the tip is always in contact with the bottom surface of the guide groove 4b of the operation cam 4a. You will not be able to rise upside down.

In addition, when power is applied to the cam pin 19 through the power lines 22 and 23, as the cam pin 19 is heated, the restoring elasticity of the shape memory alloy spring 20 is increased by the heat, and thus the cam pin 19 ) Withstands the force of the general spring 21 and moves rearward, so that the cam pin 19 leaves the guide groove 4b of the actuating cam 4a of the movable slider 4, thereby releasing the lock.

Then, when the movable slider 4 is locked by the cam pin 19, the movable contact plate 9 is moved toward the fixed terminal 12 as a whole, the movable contact 8a and the fixed contact 8b are connected, and the power is turned on. When the lock is released, when the movable slider 4 is pushed again, the movable contact 8a and the fixed contact 8b are separated from each other and the power is cut off.

Other operations of the automatic shut-off type push switch using the shape memory alloy according to the present invention are performed as in the embodiment described with reference to FIGS. 7 to 12.

The prior art of the present invention was to obtain a lock release force by using a solenoid, but the present invention is to obtain a lock release force by using a shape memory alloy spring, so the parts are simplified and the required area is small, so that the switch is miniaturized. can do. In particular, since the lock is released by directly pulling the cam pin 19, the lock can be released with a small suction force. Therefore, the push switch according to the present invention has an advantage in that the manufacturing cost is very low as a whole, the assembly of the product is simplified, and it is very advantageous for miniaturization.

Claims (3)

A movable spring 3 is inserted into the case 5 so as to be movable back and forth, and the lower end of the movable slider 4 to which the knob 1 is coupled in a single body. Inserted so as to contact the front surface of (5), the fixed terminal 12 and the center terminal 13 is fixed to the bottom surface of the case 5, the movable terminal plate 9, the operating spring plate ( 10) and the operating arm 11, the operation cam (4a) is formed on the side of the movable slider (4), the cam pin 19, the shape memory alloy spring (20) and the general spring in a direction perpendicular thereto Combining (21), the automatic power off type push switch using a shape memory alloy, characterized in that it comprises a heating element for heating the shape memory alloy spring (20). The method of claim 1, wherein the pam pin 19, the shape memory alloy spring 20 and the general spring 21 is inserted into the mounting portion (2a) of the cover (2), the insertion portion in the distal end of the cam pin (19) (19a) is formed, the middle of the automatic power supply type push switch using a shape memory alloy, characterized in that the engaging portion (19b) formed. The push switch of claim 1 or 2, wherein the heating element is configured to heat by applying power to the cam pin (19).