JP6469533B2 - Push lock mechanism - Google Patents

Description

  The present invention relates to a push lock mechanism suitable for use in a push lock switch or the like.

  Conventionally, when the operating body is pressed and pressed down, the operating body is locked in the pressed position even when the pressing is released, and at the same time, the switch is turned on (or off), and the operating body is pressed once again for a while. There is a switch with a push-lock mechanism in which the lock is released and the switch is turned off (or turned on) at the same time when the operating body automatically returns to its original position when pressed down.

  In this type of push lock mechanism, for example, as shown in Patent Document 1, the tip of the short part (24a) of the lock member (24) is always on the uneven surface formed on the inner bottom surface of the heart cam (41). In some cases, the longitudinal portion (24b) of the lock member (24) is configured to spring downward by the lower end surface of the coil spring (40) for elastic contact. That is, as shown in FIG. 1 of the cited document 1, when the tip of the short part (24a) is in contact with a high part in the inner bottom surface of the heart cam (41), the long part (24b) is guided. A little lifted from the bottom of the groove 25. On the other hand, as shown in FIG. 5 of the cited document 1, when the tip of the short part (24a) is in contact with the lower part of the inner bottom surface of the heart cam (41), the long part (24b) is guided. It descends to the bottom surface of the groove 25 and its tip comes into contact with the bottom surface. In either state, the lower end surface of the coil spring (40) elastically springs down the long portion (24b), so that the tip of the short portion (24a) is always elastic on the inner bottom surface of the heart cam (41). Be touched. When the lock member (24) is bounced by using the elastic force of the coil spring (40) in this way, it is not necessary to provide a separate elastic member that bounces the lock member (24). The mechanism can be downsized and the manufacturing process can be simplified, which is preferable.

Japanese Utility Model Publication No. 61-88629

  However, in the push lock mechanism shown in Patent Document 1, the tip of the short portion (24a) has an excessively strong elastic contact force with which the tip of the short portion (24a) comes into elastic contact with the inner bottom surface of the heart cam (41). When the heart cam (41) falls from a high position to a low position on the inner bottom surface and comes into contact with the lower inner bottom surface, the impact force due to the impact of the contact is transmitted to the finger operating this ("Katsun") There was a problem that the feeling of movement was worsened. In order to improve the operation feeling, the spring force of the coil spring (40) may be weakened. However, the spring force of springing the operation element (14) is also weakened, and the operation is reduced. It feels bad.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a lock pin elastically repelled by the coil spring while maintaining a suitable elastic force of the operating body by the coil spring. An object of the present invention is to provide a push-lock mechanism capable of generating an appropriate elastic force.

In the present invention, one end side is a support portion, the other end side is a cam engagement portion, the support portion and the cam engagement portion are bent so that they face in the same direction, a coil spring, and a bottom surface of the coil spring. A case in which a spring support composed of a protrusion for inserting and supporting one end and a fulcrum portion for swingably supporting the support portion of the pin is formed, and the case is housed in the case so as to be movable up and down via the coil spring. And an operating body having a cam groove on a side surface, and a support portion for the pin is inserted into a support groove formed in a spring receiver of the case, and the support portion for the pin is The pin cam is mounted on the fulcrum portion of the case, and the pin support portion is elastically pressed downward by the end portion of a coil spring attached to the spring receiver. The tip of the engaging part is connected to the operating body. When the operating body is moved up and down by elastic contact with the groove, the tip of the cam engaging portion of the pin moves while elastically contacting the concave and convex surface in the cam groove of the operating body. the a push-lock mechanism for locking in the desired position, the continuous to the outer peripheral wall of the spring receiving provided with a projection portion which projects from the bottom surface of the case and abuts the end of the upper surface of the projecting portion and the coil spring Any position when the operating body is moved up and down by making the height of the spring contact portion the same as or higher than the highest position where the support portion of the pin moves. Even so, only one point of the end portion of the coil spring is in contact with the support portion of the pin , and further, on the outer peripheral side of the spring contact portion, there is a protrusion higher than the spring contact portion, Prevents the coil spring from falling off the spring contact part It is characterized in that it is provided a wall portion that.
According to the present invention, since the support portion of the pin is pressed by only one point of the end portion of the coil spring, its elasticity is weaker than that when the support portion is pressed by two points of the end portion of the coil spring. Can be elastic. In other words, while maintaining the elasticity of the operating body by the coil spring at an appropriate level of elasticity (strong elasticity), the elasticity of the pin that is springed by this coil spring is also at an appropriate level of elasticity (weak elasticity) Power).
It is preferable that the length of the pin support portion is longer because the pin can be stably supported. For this reason, the present invention is particularly suitable for use when the pin and the coil spring are formed long so that the ends of the coil spring intersect at two points on the support portion of the pin when viewed from directly above. For example, if the above-mentioned stability does not become a problem, the length of the pin support portion is set to the length of the end of the coil spring so that only one point of the end of the coil spring is in contact with the pin support portion. You may form in the short length which does not contact at a point.

Also, the spring bearing of the side end portion of the coil spring is in contact with the support portion of the pin by increasing the height of the spring contact portion which is provided on the opposite side, and the end portion of the coil spring Since the contact position with the pin support is made one point , the pin and coil spring are viewed from directly above, and the pin support is formed long so that the end of the coil spring intersects at two points. Even if it is, the contact position between the end portion of the coil spring and the support portion of the pin can be surely made only at one point on the fulcrum side of the case.

Further, when only one point of the end portion of the coil spring case on the fulcrum portion side is lifted by the support portion of the pin, the portion opposite to the end portion of the coil spring is separated from the spring contact portion outward. However, according to the present invention, since the wall portion is provided, it is possible to reliably prevent the portion opposite to the end portion of the coil spring from being detached from the spring contact portion.

In addition to the above features , the present invention is characterized in that the support groove is formed so as to traverse the entire spring receiver including the spring contact portion and the wall portion.
The present invention, in addition to the above characteristic, the support portions of the front Symbol pin is characterized in that it is formed to a length to penetrate the support groove.
The pin can be reliably supported by inserting the support portion of the pin into the support groove. In particular, since the support portion of the pin penetrates the spring receiver, the length thereof can be formed long and stable support can be performed.

  According to the present invention, the elastic force of the lock pin that is springed by the coil spring can be set to an appropriate spring force while the spring force of the operating body by the coil spring is maintained at an appropriate spring force. .

1 is a perspective view of a push lock switch 1. FIG. 1 is an exploded perspective view of a push lock switch 1. FIG. FIG. 2 is a schematic cross-sectional view of the push-lock switch 1 (A-A cross-sectional schematic view of FIG. 1). It is the perspective view which expanded the case 10 and was seen from the upper direction. It is the perspective view which expanded the case 10 and was seen from the upper direction of another angle. It is the perspective view which looked at the operation body 100 from diagonally downward. 3 is a side view of the operating body 100. FIG. FIG. 3 is a schematic cross-sectional view of the push lock switch 1 when the operating body 100 is pressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a push lock switch 1 configured using a push lock mechanism according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the push lock switch 1, and FIG. It is a figure (AA cross-sectional schematic of FIG. 1). As shown in these drawings, the push lock switch 1 houses a pin 50, a coil spring 70, and an operating body 100 to which a pair of sliders 141 and 143 are attached in a housing portion 11 of the case 10, A cover 170 is placed thereon. In the following description, “upper” refers to the direction of viewing the operating body 100 from the bottom surface 13 of the storage portion 11 of the case 10, and “lower” refers to the opposite direction.

  4 is an enlarged perspective view of the case 10 as seen from above, and FIG. 5 is an enlarged perspective view of the case 10 as seen from above at another angle. As shown in FIGS. 2 to 5, the case 10 is formed by molding a synthetic resin into a substantially rectangular box shape, and a storage portion 11 having an open upper surface is formed therein. A spring receiver 15 is formed substantially at the center of the bottom surface 13 of the storage part 11, and a fulcrum part 27 is formed adjacent to the spring receiver 15. The spring receiver 15 has a shape in which a substantially cylindrical protrusion is divided into two by a support groove 23 described below. The outer diameter of the spring receiver 15 is smaller than the inner diameter of the coil spring 70, and is thereby inserted into the coil spring 70. It has a configuration. A spring contact portion 17 is provided on the outer periphery of the spring receiver 15 opposite to the side facing the fulcrum portion 27, and a wall portion 19 is provided on the outer periphery thereof. The spring abutting portion 17 is provided on the upper surface of the protruding portion 21 provided continuously on the outer peripheral wall of the spring receiver 15, so that the height thereof is higher than the height of the bottom surface 13 by a predetermined dimension. The surface of the spring contact portion 17 is installed at a position (a position equal to or higher than the same position) higher than the highest position where the support portion 51 of the pin 50 described below incorporated in the case 10 moves (swings). ing. The wall portion 19 is provided on the outer peripheral side (the side away from the fulcrum portion 27) of the spring contact portion 17, and is configured by a protrusion that is higher than the spring contact portion 17. The side surface of the wall portion 19 on the spring contact portion 17 side is an inclined surface 19a (see FIG. 4) that approaches the spring receiver 15 downward. The spring contact portion 17 and the wall portion 19 constitute a part of the spring receiver 15. Further, a linear support groove 23 is formed in the center of the entire spring receiver 15 including the spring contact portion 17 and the wall portion 19 so as to cross (through) the entire spring receiver 15. . The depth of the support groove 23 reaches the bottom surface 13, and the spring receiver 15 including the spring contact portion 17 and the wall portion 19 is divided into two by the support groove 23. The width dimension of the support groove 23 is formed to be slightly larger than the diameter dimension of the support portion 51 of the pin 50 described below.

  The fulcrum portion 27 is a small protrusion that swingably supports a support portion 51 of the pin 50 described below, is formed in a substantially rectangular shape, and its upper surface is a pin contact surface 29. The pin contact surface 29 has a flat shape, and as shown in FIG. 3, is an inclined surface that gently falls toward the spring receiver 15 side. The fulcrum portion 27 is on an extension line of the support groove 23.

  Of the four inner side surfaces of the storage portion 11 of the case 10, a substantially V-shaped concave portion extending in the vertical direction is provided at the approximate center of the inner side surface on the side where the fulcrum portion 27 is viewed from the spring receiver 15 as shown in FIG. The pin guide part 30 which consists of is formed. The pin guide portion 30 is formed by providing convex portions 31 and 33 on both sides thereof, and is formed in a shape that widens the width to the left and right in the upward direction. The pin guide portion 30 is formed in a V shape so as to support a portion of the center portion 55 of the pin 50 described below so as to be able to swing a predetermined angle around the support portion 51.

  Of the four inner side surfaces of the storage portion 11 of the case 10, on the inner side surface facing the surface on which the pin guide portion 30 is provided, as shown in FIG. Yes. The rail part 35 guides the vertical movement of the operating body 100 by inserting a guide recess (not shown) provided in the operating body 100 described below so as to freely move up and down.

  Of the four inner side surfaces of the storage portion 11 of the case 10, three rows of switch patterns 37 and 39 are exposed on a pair of opposing inner side surfaces other than the surface on which the pin guide portion 30 and the rail portion 35 are provided. Are arranged. The switch patterns 37 and 39 are exposed surfaces of a metal plate integrated with a plurality of (three) terminals 41 and 43 protruding from the lower portions of the outer surfaces, and form a desired on / off switch pattern. Yes.

  Of the four outer surfaces of the case 10, a pair of outer surfaces on the side from which the terminals 41, 43 are protruded are recessed to insert locking claws 183 of the cover 170 described below from the left and right ends toward the inside. The cover engaging portion 45 is provided. Further, a claw-like cover locking portion 47 is provided at the center of the other pair of outer side surfaces of the case 10.

  As shown in FIG. 2, the pin 50 is formed by bending a cylindrical metal bar at two locations at a substantially right angle, so that one end side is a support portion 51, the other end side is a cam engagement portion 53, and an intermediate portion is a central portion 55. It is configured as. The support portion 51, the cam engagement portion 53, and the central portion 55 are all linear, and the support portion 51 and the cam engagement portion 53 are bent with respect to the central portion 55 so as to face the same direction. The coil spring 70 is configured by a compression coil spring.

  FIG. 6 is a perspective view of the operating body 100 to which the sliders 141 and 143 are attached as seen obliquely from below, and FIG. As shown in these drawings and FIG. 2, the operating body 100 is a molded product of synthetic resin, and is configured by providing an operating portion 131 on the upper portion of the main body 101. The main body 101 has a substantially quadrangular prism shape, is provided with a cam groove 103 on one outer peripheral side surface, and a guide recess (not shown) that is inserted into the rail portion 35 of the case 10 is formed on the opposite outer peripheral side surface in the vertical direction. Has been. The cam groove 103 includes a first surface m1 with which the tip of the cam engaging portion 53 of the pin 50 abuts when the lock is released, an inclined surface m2 that increases the height of the surface, and a surface that is increased by the inclined surface m2. A second surface m3 slightly lowered with a step from the third surface m4 slightly lowered with a step from the second surface m3, a fourth surface m5 slightly lowered with a step from the third surface m4, An inclined surface m6 that increases the height of the surface from the fourth surface m5 is formed on the bottom surface of the substantially heart-shaped groove. On the other hand, on the bottom surface of the main body 101, there is formed a circular concave spring end accommodating portion 105 for inserting and supporting the end of the coil spring 70. Sliders 141 and 143 are attached to a pair of outer peripheral sides located on the left and right sides of the surface of the main body 101 where the cam groove 103 is formed.

  Each of the sliders 141 and 143 is made of an elastic metal plate, and a plurality of (three) sliding booklets 145 and 147 are projected from the lower sides of the substantially rectangular base parts 142 and 144, and each sliding booklet 145 The base portion of 147 is turned up to be turned upward, and contacts 149 and 151 that are curved outward are formed at the tips of the sliding booklets 145 and 147. The sliders 141 and 143 are attached to the operation body 100 by press-fitting convex portions 107 and 109 provided on the operation body 100 into fitting holes provided on the base portions 142 and 144.

  The cover 170 is made of a metal plate, and is configured by projecting substantially rectangular side wall portions 173 and 175 from two opposing sides of a cover main body portion 171 formed in a substantially rectangular shape. A substantially rectangular opening 177 into which the operation part 131 of the operation body 100 is inserted is provided at the center of the cover body 171, and the cover body 171 is bent downward at the center of one side of the opening 177. A pin presser portion 179 is formed. The pin presser 179 is provided to restrict the pin 50 from moving upward by abutting against the root portion of the cam engaging portion 53 of the pin 50 described below. Next, a locking hole 181 made of a rectangular opening that is inserted and locked in the cover locking portion 47 of the case 10 is provided at the lower center of the side wall portions 173 and 175. In addition, locking claws 183 that protrude in a rectangular shape are provided from the lower portions of the left and right sides of the side wall portions 173 and 175, respectively.

  In order to assemble the push lock switch 1, first, the pin 50 is inserted into the housing portion 11 of the case 10, and at this time, the support portion 51 of the pin 50 is inserted into the support groove 23 of the case 10. At the same time, the central portion 55 of the pin 50 is inserted into the pin guide portion 30 of the case 10. At this time, the support portion 51 is placed on the fulcrum portion 27 of the case 10. Further, the support portion 51 penetrates the spring receiver 15. By inserting the support portion 51 of the pin 50 into the support groove 23, the pin 50 can be reliably supported. In particular, since the support portion 51 of the pin 50 passes through the spring receiver 15, its length can be formed long and stable support can be performed. In particular, the stability of the pin 50 when the pin 50 is incorporated into the case 10. (Of course, it is also suitable for stable operation of the pin 50 after being incorporated).

  Next, the coil spring 70 is inserted into the storage portion 11, and the spring receiver 15 of the case 10 is inserted into the lower end thereof. Next, the operating body 100 to which the sliders 141 and 143 are attached is inserted into the storage unit 11. At this time, as shown in FIG. 3, the upper end portion of the coil spring 70 is inserted into the spring end storage portion 105 of the operating body 100, and the rail portion 35 of the case 10 is vertically moved to a guide recess (not shown) of the operating body 100. Insert freely.

  Next, the cover 170 is covered so as to cover the storage portion 11 of the case 10, and the cover locking portion 47 of the case 10 is snap-engaged with the locking hole 181 of the cover 170. At this time, the operating portion 131 of the operating body 100 protruding from the case 10 is inserted into the opening 177 of the cover 170. Then, each cover claw 183 of the cover 170 is bent and inserted into each cover engaging portion 45 of the case 10, thereby fixing the cover 170 to the case 10. Thus, the assembly of the push lock switch 1 is completed. The above assembling procedure is an example, and it goes without saying that the assembly may be performed using other various assembling procedures.

  In the push lock switch 1 assembled as described above, the support portion 51 of the pin 50 is swingably supported by the fulcrum portion 27 of the case 10 and attached to the spring receiver 15 as shown in FIG. The lower end of the coil spring 70 is elastically pressed downward, whereby the tip 53a of the cam engaging portion 53 of the pin 50 is supported by the cam groove 103 (the inner bottom surface) of the operating body 100 with the fulcrum portion 27 as a fulcrum. It is elastically touching. In FIG. 3, the tip 53a of the cam engaging portion 53 is in elastic contact with the first surface m1 that has been unlocked. The operating body 100 is bounced so as to be pushed upward by the coil spring 70, and is in the unlocked state.

  At this time, the contact position a1 between the lower end of the coil spring 70 and the support portion 51 of the pin 50 is only one point on the fulcrum portion 27 side of the case 10. That is, the end portion of the coil spring 70 that contacts the support portion 51 (contact position a1) is opposite to the end portion of the coil spring 70 (contact position a1). Of the two points a1 and a2 to be performed, another point that is not the contact position a1 close to the fulcrum portion 27) is not in contact with the support portion 51. For this reason, the elastic force by which the support portion 51 is pushed down by the coil spring 70 is smaller than the elastic force by which the operating body 100 is pushed up by the coil spring 70, and the elastic force is weakened so that the elastic force is moderate. Power That is, while the elasticity of the operating body 100 by the coil spring 70 is maintained at an appropriate elasticity (strong elasticity), the elasticity of the pin 50 that is emitted by the coil spring 70 is also an appropriate elasticity. (Weak resilience). Particularly, since the distance between the contact position a1 and the fulcrum portion 27 is short, the moment (rotational force) of the force for swinging the pin 50 can be reduced. The moment of force applied to the pin 50 can be easily adjusted by adjusting the distance between the contact position a1 and the fulcrum portion 27.

  When the operation unit 131 of the operation body 100 is pressed downward, the operation body 100 descends against the elastic force of the coil spring 70, and the contacts 149 and 151 of the pair of sliders 141 and 143. Slides on the switch patterns 37 and 39, whereby the on / off states of the terminals 41 and 43 are switched.

  Next, when the pressing to the operating body 100 is released, the operating body 100 is locked at the pressed position. Next, when the operating body 100 is pressed again and the pressing is released, the operating body 100 rises to the position where the original lock is released, and thereby the on / off states of the terminals 41 and 43 are switched to the original state. . During this series of operations, the cam engaging portion 53 of the pin 50 moves in the cam groove 103 of the operating body 100. That is, the tip 53a of the cam engagement portion 53 when the operating body 100 is in the unlocked state is in contact with the first surface m1 shown in FIGS. When the operating body 100 is pressed and lowered, the tip 53a passes through the inclined surface m2 as shown by a one-dot chain line in FIG. The state at this time is shown in FIG. When the pressure on the operating body 100 is released, the tip 53a moves over the step to the third surface m4 and is locked here. If the operating body 100 is pressed again, the tip 53a moves over the step to the fourth surface m5, and by releasing the pressure on the operating body 100, the tip 53a passes through the inclined surface m6 and returns to the original first surface m1. Move to. That is, when the operating body 100 is moved up and down, the tip 53a of the cam engaging portion 53 of the pin 50 moves while elastically contacting the concave and convex surface in the cam groove 103 of the operating body 100, so that the operating body 100 is desired. (Locked position and unlocked position).

  By the way, the position m21 before the tip 53a of the cam engaging portion 53 falls from the first surface m1 through the inclined surface m2 to the second surface m3 is the highest position among the uneven surfaces of the cam groove 103. In this position, the pin 50 swings most about the fulcrum 27, and the support 51 moves to the highest position. However, in the present embodiment, even if the support portion 51 is located at the highest position, the position of the spring contact portion 17 is higher (or the same position) than that, so the support portion 51 is located at the position a2 of the coil spring 70. It does not press the part. That is, the spring abutting portion so that only one point (contact position a1) of the end portion of the coil spring 70 is always in contact with the support portion 51 of the pin 50 at any position when the operating body 100 is moved up and down. 17 is formed, an appropriate elastic force is always applied to the pin 50 as described above.

  Further, when the tip 53a of the cam engaging portion 53 is in contact with the position m21 just before falling on the second surface m2, the support portion 51 of the pin 50 is when the coil spring 70 is pushed up most. The impact is strongest, and the strongest impact occurs when falling to the second surface m2. However, in the push lock switch 1, the elastic force is an appropriate elastic force as described above, so that the impact is not so strong. For this reason, there is no problem that the impact force due to the impact of the contact is transmitted to the finger operating the contact, and the operational feeling is deteriorated.

  In addition, since only one side of the lower end portion of the coil spring 70 is pushed up by the support portion 51 of the pin 50, the end portion has a force to drop off from the spring contact portion 17 toward the outside. Works. However, in this push lock switch 1, since the wall part 19 is provided, the said fall can be prevented reliably. At this time, since the side surface of the wall portion 19 on the side where the end portion of the coil spring 70 abuts is used as the inclined surface 19a (see FIG. 4), even when the end portion of the coil spring 70 slightly rises along the wall portion 19 Thus, it can be guided so as to return smoothly to the position of the original spring contact portion 17, and it can be reliably prevented from being caught in the middle of the side surface of the wall portion 19.

  If the contact position between the end portion of the coil spring 70 and the support portion 51 of the pin 50 is set to one point (position a2) opposite to the fulcrum portion 27 side of the case 10, the fulcrum portion 27 side of the case 10 will be described. In order to prevent the support portion 51 of the pin 50 from coming into contact with the end of the coil spring 70 at one point a1, for example, the shape of the support portion 51 must be bent, and the structure may be complicated. is there. On the other hand, if the contact position is a point a1 on the fulcrum 27 side of the case 10 as in this embodiment, the contact between the end portion of the coil spring 70 and the support portion 51 of the pin 50 can be achieved with a simple structure. Can only be one point.

  Moreover, in the said embodiment, since the pin contact surface 29 of the fulcrum part 27 is made into the inclined surface, the support part 51 of the pin 50 should not be appropriately elastically pressed by the coil spring 70 for some reason (elastic pressure) Even when the pin 50 is smaller than the setting), the support portion 51 of the pin 50 abuts linearly on the pin abutment surface 29, so that the tip 53 a of the cam engagement portion 53 of the pin 50 contacts the bottom surface of the cam groove 103. The pin 50 can be swung in the abutting direction.

  In the above-described embodiment, the length of the support portion 51 of the pin 50 is formed so as to penetrate the spring receiver 15. Instead, the length of the support portion 51 is short enough not to penetrate the spring receiver 15. It is good also as a structure which forms in length (length which does not contact | abut one point a2 of the edge part of the coil spring 70), and the edge part of the coil spring 70 contacts the support part 51 only by one point a1 by this.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in the above-described embodiment, the pin contact surface of the fulcrum portion is a flat inclined surface. However, the present invention is not limited to this, and may be various other shapes such as an arc surface and an acute convex shape. The shape of the cam groove provided in the operating body can be variously modified.

DESCRIPTION OF SYMBOLS 1 Push lock switch 10 Case 11 Storage part 13 Bottom face 15 Spring receiving part 17 Spring contact part 19 Wall part 23 Support groove 27 Supporting point part 50 Pin 51 Support part 53 Cam engaging part 70 Coil spring a1 Contact position 100 Operation body 103 Cam groove 141 , 143 Slider 170 Cover

Claims (3)

One end side is a support portion, the other end side is a cam engagement portion, and the support portion and the cam engagement portion are bent so as to face the same direction,
A coil spring;
A case formed on the bottom surface with a spring support made of a protrusion for inserting and supporting one end of the coil spring, and a fulcrum portion for swingably supporting the support portion of the pin;
An operation body that is housed in the case so as to be movable up and down via the coil spring and has a cam groove on a side surface thereof,
Inserting the support portion of the pin into the support groove formed in the spring receiver of the case, and placing the support portion of the pin on the fulcrum portion of the case,
The pin support portion is elastically pressed downward by an end portion of a coil spring attached to the spring receiver, so that the tip of the cam engagement portion of the pin is used as the support body with the fulcrum portion of the case as a fulcrum. Elastically contact the cam groove of
When the operating body is moved up and down, the tip of the cam engaging portion of the pin moves while elastically contacting the uneven surface in the cam groove of the operating body, thereby locking the operating body at a desired position. A push lock mechanism ,
A protrusion that protrudes from the bottom surface of the case is provided continuously on the outer peripheral wall of the spring receiver, and the upper surface of the protrusion is used as a spring contact that contacts the end of the coil spring. When the operating body is moved up and down, only one point at the end of the coil spring is always the pin at any position when the operating body is moved up and down by making it equal to or higher than the highest position where the support portion of the pin moves. It is configured to contact the support part of
Furthermore, a wall portion is provided on the outer peripheral side of the spring contact portion, the wall portion being configured to be a protrusion higher than the spring contact portion and preventing the coil spring from falling off the spring contact portion. Push lock mechanism. The push lock mechanism according to claim 1,
The push lock mechanism, wherein the support groove is formed so as to cross the entire spring receiver including the spring contact portion and the wall portion. The push lock mechanism according to claim 2,
Supporting portion of the front Symbol pins, push-lock mechanism, characterized in that it is formed to a length to penetrate the support groove.

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