JP5789437B2 - Latch device - Google Patents

Description

  Of the latch devices used when the second member (for example, a movable body such as a lid or a door) is detachably locked to the first member (for example, a main body or a base body), Push type that locks the striker on the second member side by pushing operation and unlocks it by the next pushing operation (this is also called push-push type, push-lock push-open type, alternate type, etc. The following is the same).

  FIG. 10 shows a push-type latch device disclosed in Patent Document 1. In this structure, the case 2, the sliding body 30 having the abutting portion 32, the cam groove 5, and the like that are disposed in the case and are pressed and moved against the urging force of the spring member 45, and the front end side claw portion 39. And an engaging body 37 pivotally supported by the sliding body 30 with the rear end side convex portion 38 c and the trace member 6. Here, the engaging body 37 is fitted and supported by the shaft portions 37a on both sides of the shaft hole of the sliding body 30, and by the movement of the sliding body 30, the claw portion 39 protrudes on the abutting portion 32 and is disengaged. The locking state is switched between (b) where the striker 62 which is a member is locked and (a) where the claw portion 39 is retracted from the abutting portion 32. In the unlocked state, the sliding body 30 is moved to the case entrance side by the urging force of the spring member 45, and the engaging body 37 rides the protruding portion 38 c on the overhanging portion 28 provided in the case 2 to change the state. keep. In the locked state, the sliding body 30 is moved to the back side against the urging force of the spring member 45 by the pushing force of the striker 62, and the position after the movement is engaged through the engagement of the cam groove 5 and the trace member 6. The engaging body 37 is moved to a portion where the convex portion 38c is lowered from the protruding portion 28, and is tilted to project the claw portion 39 from the opening 33 on the sliding body side.

  In other words, the above latch device switches the engagement body 37 from the unlocked state to the locked state by the pushing force of the striker 62 against the sliding body 30, and from the locked state by the next pushing force of the striker 62 against the sliding body 30. Switch to the unlocked state. At that time, the upper side of the spring member 45 is locked to a projecting piece provided in the lower middle of the engaging body 37, and the spring member 45 is engaged while accumulating urging force in the process of the sliding body 30 being pushed and moved to the back. The united body 37 is rotated counterclockwise in the same figure with the shaft portion 37a as a fulcrum, and can be switched from the unlocked state to the locking direction.

As an example of use, when a latch device is attached to the main body side and a striker 62 is provided on the door side, FIG. 10B shows a state where the door is locked (locked) to the main body. It is locked by an engaging body 37 constituting a latch device on the main body side. When the door is pushed again toward the main body, the locking is released from the locking groove of the cam groove 5 and the locking is released as shown in FIG. Such a structure is the same in the latch devices of Patent Documents 2 and 3.

Japanese Patent No. 4164329 JP 2008-208684 A JP 2010-106478 A

  In the above-described latch device, for example, when an external force acting in a direction in which the door is separated from the main body acts in a locked state where the door is closed, the engaging body 37 receives the stress in the pulling direction of the striker 62 and opens the sliding body side opening 33. It is in pressure contact with the inner surface of the partitioning frame. In this structure, a predetermined locking force, that is, a force for maintaining the locked state (unreasonable load) is obtained between the engaging body 37 and the striker 62 by the frictional force generated at that time, and the door is The situation of inadvertent opening is prevented.

However, it has been difficult to maintain such a force-free load constant depending on external factors such as the surface roughness and the degree of sinking between the surfaces where the engaging-body-side claw portions 39 and the openings 33 are in contact with each other. Further, in the conventional structure, providing an undercut stepped difference to the shape of the engaging body side claw portion 39 to increase the force pushing load, easy claw portion 39 is normal operation of the normal, such as catching on the opening 33 side is damaged Become. When an external force larger than the force with which the door is forcibly applied is applied to the door, the engaging body 37 is rotated so that the claw portion 39 retracts from the abutting portion 32, that is, the locked state is switched to the unlocking direction. It becomes a cause of destruction of cam grooves and trace members.

  As countermeasures as described above, the present applicant has developed the configurations disclosed in Patent Documents 2 and 3. The object of the present invention is to increase the degree of freedom of design and to expand applications by making it possible to increase the unreasonable load or to change the size according to the application surely and accurately as compared with those countermeasures.

  To achieve the above object, the present invention, when specified with reference to the drawings, urges the case 1, the sliding body 2 with a cam groove disposed in the case, and the sliding body in a direction protruding from the case. Switching between a spring member 4 to be engaged and a locking state pivotally supported by the sliding body to project the tip side claw 32 from the sliding body to lock the engaged / disengaged member 7 and an unlocking state to retract to the sliding body. And a trace member 5 that moves in the cam groove. When the slide body 2 is moved against the urging force of the spring member 4, the cam groove and the trace member are moved to a position after the movement. And the engagement body 3 is pivotally supported by the sliding body 2 so that the engagement body 3 can be swung in the latch device in which the engagement body 3 is switched from the unlocked state to the locked state. Pulling out the engaged / disengaged member 7 in a locked state where the 7 is locked A locking reinforcement body 6 for increasing the unreasonable load that can accumulate a biasing force as a swinging resistance of the engagement body when it is swung in the unlocking direction by a pulling force in the direction. It is characterized by. In addition, the above locking reinforcement body 6 becomes releasable with the movement which resisted the urging | biasing force of the spring member 4 of the sliding body 2 so that the above-mentioned stored urging | biasing force may be illustrated in FIG.

The present invention as described above is more preferably embodied as in the second to sixth aspects. That is,
(A) The locking reinforcement body 6 has a configuration having an elastic piece portion 6c capable of accumulating an urging force by being pressed against the engaging body (Claim 2).
(A) The locking reinforcing body 6 and the sliding body 2 have a convex portion 21e provided on one side and a concave portion 6b provided on the other side, and the engaging body 3 is released from the locked state. In the process of switching to the state, the convex portion and the concave portion are detachably fitted to restrict swinging of the locking reinforcement body (Claim 3).
(C) The engagement reinforcing body 6 has protrusions 6d provided on both sides in the width direction, and the protrusion is assembled in a state of being fitted to a positioning part 33 provided on the engagement body side. (Claim 4).

(D) The engagement body 3 has a recess 34 provided on the back side, and the elastic piece 6c is disposed in the recess so as to be capable of being pressed and deformed (Claim 5).
(E) The sliding body 2 and the engaging body 3 have a long hole 29 provided on one side and a shaft portion 35 provided on the other side, and the engaging body has the shaft portion with respect to the sliding body. The shaft portion 35 is pivotally supported so as to be movably fitted in the elongated hole, and the engaging body is swung in the unlocking direction by the pulling force in the pulling direction of the engaged / disengaged member. Is configured to move within the elongated hole 29 (Claim 6).

  According to the first aspect of the present invention, when the engaging body is engaged with the engaged / disengaged member (the trace member is engaged with the cam groove), it is forcibly removed through the engaged / disengaged member as shown in FIG. When a load of a certain value or more is applied in the direction, the engaging body tries to rotate in the unlocking direction as shown in FIG. 8, and at that time, it resists the elasticity or urging force of the locking reinforcing body, that is, the locking reinforcing body. If it is not elastic force, it rotates while accumulating the urging force to unlock the engaged / disengaged member.

  For this reason, in the present invention, the locking reinforcement body elastically bends when forcibly removed in FIGS. 7 and 8 and acts as a swinging resistance of the engagement body. As inferred from FIG. 5 and FIG. 6, the locking reinforcement does not bend and thus operates smoothly as in the case without the locking reinforcement. As a result, in the present invention, it is possible to increase the unreasonable load by changing the locking reinforcement body or a part thereof, or to change it reliably and accurately according to the application, and as a result, the degree of freedom in design is improved and the application is expanded. Can contribute.

  In the invention of claim 2, since the locking reinforcement body has an elastic piece portion that presses against the engagement body, for example, only by changing the thickness, length, inclination, etc. of the elastic piece portion, it is suitable for the application. It is possible to easily set the force for unloading the size.

  In the invention of claim 3, as shown in FIG. 8, when the engaging body is switched from the locked state to the unlocked state, the convex portion and the concave portion provided between the sliding body are fitted together. By restricting the rocking of the locking reinforcement body, the corresponding part can be easily bent and the elastic force can be obtained efficiently.

  In the invention of claim 4, when the locking reinforcement body has protrusions provided on both sides in the width direction, and each protrusion is fitted to a positioning part provided on the engagement body side, In the pivoted state, an accurate positional relationship of the locking reinforcement body with respect to the engaging body is maintained, so that the corresponding portion is always bent by the same value or an elastic force can be obtained.

  In the invention of claim 5, since the elastic piece portion of the locking reinforcement body is arranged in the recess of the engagement body, it is easy to secure the arrangement space of the elastic piece portion, and stable press deformation can be obtained.

  In the invention of claim 6, the engaging body is pivotally supported in a state in which the shaft portion is movably fitted to the sliding body so as to be movable in the elongated hole, and the engaging body is unlocked by the pulling force in the pulling direction of the engaged / disengaged member. Since the shaft portion moves in the elongated hole when it is swung in the direction, for example, it is possible to alleviate an excessive load caused by excessive removal or to suppress the generation of a buffer sound.

The relationship between the latch device of the form and the striker is shown, (a) is a schematic view seen from the front with the striker unlocked, and (b) is a schematic view seen from the rear with the striker locked. It is the schematic block diagram which decomposed | disassembled the said latch apparatus. (A) is a perspective view enlarging and showing the principal part of the said latch apparatus, (b) is a single-piece figure of a latching reinforcement body. The usage example of the said latch apparatus is shown, (a) is a side view corresponding to Fig.1 (a), (b) is a side view corresponding to FIG.1 (b). The latch device is shown in a state corresponding to FIG. 4A, where FIG. 5A is a schematic longitudinal sectional view, and FIG. 5B is a schematic diagram of a relationship between a trace member and a cam groove. The latch device is shown in a state corresponding to FIG. 4B, (a) is a schematic longitudinal sectional view, and (b) is a schematic relationship diagram between a trace member and a cam groove. FIG. 2 schematically shows an operation of forcibly removing the latch device, wherein (a) is an enlarged view of a main part in a state where the striker is locked, and (b) is an enlarged view of an essential part for explaining the forcible removal. (A) Forcibly removed initial mode diagram of the latch device, (b) is a forcibly removed final mode diagram. (A) And (b) shows operation at the time of returning the said latch apparatus to an initial state after forcibly removing, (c) is a schematic diagram of a trace member and a cam groove. (A), (b) is explanatory drawing which shows the latch apparatus of patent document 1 in a latch release state and a latching state.

  The best mode of the present invention will be described with reference to the accompanying drawings. 1 to 3 show the structure of the latch device, FIG. 4 shows an example of use of the latch device, and FIGS. 5 to 9 show the operation of the latch device. In the drawings, details are schematically illustrated or simplified due to restrictions on drawing. In the following description, the operation will be described in detail after clarifying the device structure and assembly procedure.

(Device Structure) The latch device disclosed in FIGS. 1 to 4 includes a case 1 having a flat container shape, a contact portion 22 that comes into contact with a striker 7 that is a member to be engaged and disengaged, and a cam groove 27. A sliding body 2 arranged to be able to advance and retreat, and a locking state that is pivotably supported with respect to the sliding body 2 and that allows the striker 7 to be locked by protruding the claw portion 32 onto the abutting portion 22. And the engaging body 3 that is switched to the unlocking state retreating from above the abutting portion 22, the spring member 4 that urges the sliding body 2 in the direction to protrude from the case 1, and the trace that turns the cam groove 27. A member 5 and a locking reinforcement 6 for forcibly increasing the load are provided. When the sliding body 2 is pushed rearward by the striker 7 and moved against the urging force of the spring member 4, the latch device is moved to the position after the movement via the cam groove 27 and the trace member 5. It is a push type that is locked and the engaging body 3 is switched from the unlocked state to the locked state.

Further, the above latch device, for example, attached to the main body 8 side of the equipment shown in FIG. 4, when it use example disengaging the striker 7 attached to the door 9, urges the door 9 is not shown When pressed against the biasing force of the means in the closed position direction, the door 9 is locked via the striker 7, and when the door 9 is further pressed in the same direction to release the pressing force, the lock on the striker 7 is released. . Of course, as a method of use, the latch device may be attached to the movable body side such as a door, and the engaged / disengaged member attached to the main body side of the equipment may be engaged / disengaged. Moreover, although the case 1, the sliding body 2, the engaging body 3, and the locking reinforcement body 6 are resin molded products, materials other than resin may be used.

Here, as shown in FIGS. 1, 2, and 5, the case 1 has a substantially cylindrical shape in which the inside is defined by upper and lower walls 10, 11, both side walls 12, and a rear bottom wall 13. ing. Of these, although the details are omitted on the inner surface of the upper wall 10, a guide groove (not shown) that restricts the swing range of the trace member 5 and a guide groove 10 a at a substantially intermediate portion on the left and right that guides the back and forth movement of the sliding body 2. Etc. are provided. The lower wall 11 includes a guide groove 11a that is positioned in the middle of the front and rear to restrict the moving range of the sliding body 2, a shallow guide groove 11b that extends from the doorway to the front of the guide groove 11a, and an inner surface A projecting portion 16 that protrudes on both sides and allows the engaging body 3 to rotate in the unlocking direction, a positioning portion (not shown) that positions the support shaft 40 that is provided on the rear side and holds the spring member 4, and the like. Is provided. The side walls 12 are provided with a mounting portion 17 with a hole 17a projecting from the rear lower side, a guide groove 14 provided oppositely and extending in the front-rear direction.

  The bottom wall 13 is configured as a holding portion to which the trace member 5 is swingably attached. The holding portion has a substantially concave shape provided so as to be connected and supported on the inner surfaces of the side walls 12. On the concave opposing surface, a projection (not shown) that fits in a fitting hole 5e of a trace member side mounting portion 5a, which will be described later, and a hole (not shown) that fits a convex portion 5d provided on the end surface of the mounting portion 5a. Etc. are provided.

  As shown in FIGS. 2 and 3, the sliding body 2 has a substantially rectangular container-like main body 20 arranged on the entrance / exit side of the case 1, and a rear extension that protrudes behind the main body 20 and is narrower than the main body 20. Part 25. On the outer surface of the main body 20, a protrusion 20 a on the upper surface that fits into the guide groove 10 a, a protrusion 20 b on both sides that fits in the guide groove 14, and a locking reinforcement body 6 that penetrates both sides on the same axis. A pivotal shaft hole 23 and a rectangular opening 21a provided on the lower surface side are provided. The inner part 24 of the main body includes an abutting portion 22 on the back end face, an upper surface 21b inclined so as to spread from the middle toward the outer upper side, and a lower surface 21c inclined so as to spread from the opening 21a side toward the outer lower side. The two sides 21d are opposed to each other and can also enter and exit from the opening 21a. The outer surface of the lower surface 21c is provided with a convex portion 20c extending in the width direction as shown in FIG.

  The rear extension 25 is composed of an upper portion forming a heart-shaped cam groove 27 and a lower cylindrical portion 26 extending in the same direction as the upper portion. The upper cam groove 27 is provided around the convex cam island 28 as shown in FIG. 5 (b), and is separated from the left and right by being located on the front side of the guide groove 27a and the guide groove 27a extending from the rear side to the front side. The guide groove 27b and the guide groove 27d for release, the concave lock groove 27c located between the guide grooves 27b and 27d and on the rear side, the return groove 27e extending rearward from the guide groove 27d, and the like. Has been. On the other hand, the cylindrical portion 26 forms a cylindrical hole in which the upper side of the above-described spring member 4 can be loosely fitted, and a projection that protrudes on the lower side of the cylinder and engages with the guide groove 11a. 26a, and a long hole 29 provided on both sides of the cylinder for pivotally supporting the engaging body 3.

  As shown in FIGS. 2 and 3, the engaging body 3 includes a front plate portion 30, rear piece portions 31, 31 on both sides projecting rearward from the front plate portion 30. The front plate portion 30 includes a claw portion 32 protruding upward, a recess portion 33 provided on both sides and opened forward or upward, a rectangular recess portion 34 provided on the back side, and a rear end surface. And a protruding piece portion 38 that protrudes in the middle of the left and right sides of the tube portion 26 and enters the tube of the tube portion 26 is provided. The nail | claw part 32 is a magnitude | size which is freely entered into the inside 24 from the sliding body side opening 21a, or is retracted. Each rear piece portion 31 is formed with a pivot shaft portion 35 on the front plate portion 30 side and a convex portion 36 on the rear end side so as to protrude from the opposing inner surface.

  A coil spring is used for the spring member 4, and the rear end side is held by the corresponding portion of the case 1 via the support shaft 40. The spring member 4 increases the urging force in the process in which the sliding body 2 is pressed and moved to the back of the case 1, and the urging force enables the engaging body 3 to rotate in the locking direction with the shaft portion 35 as a fulcrum. .

  The trace member 5 has a substantially inverted L shape as shown in FIG. 2, and includes a vertical mounting portion 5a, a horizontal arm portion 5b connected to the upper end of the mounting portion 5a, and a pin protruding from the lower end of the tip of the arm portion 5b. Part 5c. Among these, the attaching part 5a forms a convex part 5d at the lower end, a concave part 5e on both sides, and a convex receiving part 5f on the lower inner peripheral side, and is formed on the concave holding part of the case bottom wall 13 described above. On the other hand, the convex portion 5d is fitted into a hole (not shown) on the holding portion side, and a protruding piece portion (not shown) on the holding portion side is held so as to be able to swing left and right in a state of being fitted to each concave portion 5e. The pin portion 5c has a rectangular shape with a small cross section, and is provided at a right angle from the arm portion 5b. The above-described trace member 5 is always urged backward by positioning and locking the support shaft 40 supporting the spring member 4 to the receiving portion 5f, thereby absorbing backlash and centering. It is possible.

  As shown in FIG. 3, the locking reinforcing body 6 has a schematic shape that covers the upper part of the back surface of the engaging body-side front plate portion 30, and protrudes on both side surfaces to be fitted into the shaft hole 23 on the sliding body side. 6a, a recess 6b that is provided on the front upper side and engages / disengages with the above-described sliding body side convex portion 20c, and a plurality of pieces that are loosely fitted or inserted in the recess 34 on the rear lower side provided on the engagement body side. An elastic piece 6c, a protrusion 6d that protrudes from both sides in substantially the same direction as the elastic piece 6c and fits into the above-described recess 33 on the engaging body, and is located on both sides and opposite to the protrusion 6d And an arcuate portion 6e that is curved and covers the back side of the front plate portion 30.

(Assembly) In each of the above members, first, the engaging body 3 and the locking reinforcement body 6 are assembled to the sliding body 2. In this operation, for example, the locking reinforcement body 6 inserts each elastic piece 6c into the corresponding recess 34 with respect to the engagement body 3 as shown in FIG. It is assembled by fitting to. From this state, in this structure, the locking reinforcement body 6 is pivotally fitted to and supported by the shaft portions 6 a on both sides of the shaft holes 23 of the slide body 2, and the engagement body 3 is supported by the long holes 29 of the slide body 2. The shaft portions 35 on both sides are fitted and supported.

  Next, the above-described engaging body 3 and the sliding body 2 with the locking reinforcing body 6 are incorporated into the case 1. In this operation, for example, the spring member 4 is arranged in the case 1 in advance in a state where the spring member 4 is supported in a swingable manner on the holding portion of the bottom wall 13 described above via the support shaft 40. deep. When the sliding body 2 with the engaging body 3 and the locking reinforcement 6 is pushed into the case 1 with the projection 20a fitted into the guide groove 10a and the projection 20b fitted into the guide groove 14, the projection 26a. Is fitted to the case 1 so as not to come off when the guide groove 11b falls into the guide groove 11a.

In this pushing-in process, the upper side of the spring member 4 enters the cylindrical portion 26 and comes into contact with the protruding piece portion 38 of the engaging body 3. The spring member 4 increases the urging force in the process in which the sliding body 2 is pressed and moved to the back of the case 1, and the urging force can rotate the engaging body 3 in the locked state about the shaft portion 35 as a fulcrum. To. Further, the pin portion 5 c of the trace member enters the groove entrance of the corresponding cam groove 27. On the other hand, as shown in FIG. 8, when the engaging body 3 is swung in the unlocking direction by the pulling force in the pulling direction of the striker 7 as shown in FIG. When the force is stored and the striker 7 is pulled out of the engagement body 3, the engagement body 3 is again switched to the locked state by the stored biasing force.

(Operation) As described above, the latch device described above is positioned on the equipment-side main body 8 and attached with screws or the like corresponding to the striker 7 attached to the door 9 as illustrated in FIG. In the mounted state, the latch device is normally urged and moved in the protruding direction by the spring member 4 as shown in FIG. 5 (this movement is restricted by the protrusion 26a hitting the front end surface of the guide groove 11a). At the same time, the engaging body 3 is rotated in a direction in which the claw portion 32 retracts outward from the inside 24 of the main body (this rotation rides on the highest portion of the protruding portion 16). This state is the unlocking state of the engagement body 3.

  When the door 9 is pushed in the direction of the left arrow in FIG. 4A, which is the closing direction, the sliding body 2 is pushed and moved by the striker 7 in a direction in which the sliding body 2 lies in the case 1 against the urging force of the spring member 4. Is done. In the moving process, the engaging body 3 is rotated in the direction of the locked state with the shaft portion 35 as a fulcrum. Then, in the engaging body 3, the convex portion 36 moves to the lower side of the overhanging portion 16, and at the same time, the claw portion 32 is engaged with the concave portion 7c provided in front of the tip 7a of the striker to prevent it from coming off. At this time, as shown in FIG. 6, the engaging member 3 enters the locking guiding groove 27b from the guiding groove 27a by the backward movement of the sliding member 2 and the engaging member 3 as shown in FIG. When the pressing force in the direction is released, it is locked in the locking groove 27c. By this engagement, the door 9 is locked and held in the closed state.

  Further, when switching from the above-described door holding state to the release state of FIG. 5, the pressing force is released after the door 9 is pushed slightly in the closing direction. Then, the pin portion 5c of the trace member returns to the groove entrance again from the locking groove 27c described above through the release guiding groove 27d and the return groove 27e as shown in FIG. 6B, and at the same time, the engaging body 3 is released from the initial state. Switch to position. This latch device is the same as the conventional one in the normal operation as described above, but is improved in the following points.

  That is, in the above-described latch device, the normal operation is maintained in the same manner as in the past, and the same force is applied to the door 9 described above in the unreasonable load, that is, in the locked state of the engagement body 3 shown in FIG. When an external force is applied in the door opening direction as shown in (b), the load or strength when the engaging body 3 is rotated so that the claw portion 32 retracts from the inside 24 of the main body to the outside, that is, when the engaging body 3 is switched to the unlocked state by forcibly removing it. Can be increased by the locking reinforcement body 6, and furthermore, the locking reinforcement body 6 can be optimally removed depending on the application by simply changing the degree of deformation depending on the thickness, hardness, length, etc. of the elastic piece 6 c. Can be changed to load. This point will be clarified with reference to FIGS.

(1) FIG. 7B shows an initial state in which an external force is applied to the door 9 in the locked direction of the engaging body 3 as shown in FIG. Yes. In this initial mode, when the engagement body 3 is pulled forward by an external force, the engagement body 3 tends to move in the clockwise direction with the shaft portion 25 fitted in the sliding body side long hole 29 as a fulcrum. At that time, the engagement body 3 absorbs the gap a between the claw portion 32 and the corresponding portion of the opening 21a shown in FIG. 4A, and the shaft portion 35 moves from the front side to the rear side in the shaft hole 29. Further, since the locking reinforcement body 6 pivotally supported via the shaft portion 6a and the shaft hole 23 with respect to the sliding body side main body 20 approaches the engagement body 3, it is elastic in the engagement body side recess 34 as shown in FIG. The piece 6c is bent by the dimension b. In addition, since the protrusion 6d is fitted to the engagement body side recess 33 with respect to the engagement body 3, the locking reinforcement body 6 is restricted from rotating about the shaft portion 6a.

(2) In FIG. 8B, the external force in the direction of the arrow acts further from FIGS. 7B and 8A, and the engaging body 3 retracts the claw 32 from the inside 24 of the main body, that is, in the unlocking direction. A state is shown in which the claw portion 32 has been almost completely retracted from the inside 24 of the body by rotating. In these processes, the engagement body 3 is rotated clockwise around the shaft portion 35 as a fulcrum while the pawl portion 32 is in sliding contact with the corresponding end surface of the opening 21a. The elastic piece 6c of the locking reinforcement body increases the degree of pressure contact with the inside of the recess 34 by the rotation thereof and accumulates the urging force.

  Accumulation of the urging force as described above is maximized immediately before the engaging body 3 reaches the unlocked state of FIG. 8B and the tip 7a of the striker 7 is moved outward across the opening 21a. In other words, in this structure, when the engaging body 3 is switched from the locked state to the unlocked state with the shaft portion 35 as a fulcrum, the deformation force of the elastic piece portion 6c is received to cause the unreasonable force described in the problem. The punching load or strength can be increased. The unreasonable load or strength can be easily set to an arbitrary size according to the application by preparing a plurality of locking reinforcements 6 with different thicknesses of the elastic piece 6c, etc., and selecting them. Can be changed. It should be noted that the locking reinforcement body 6 is ineffective due to the concave portion 6b elastically engaging the sliding body-side convex portion 20c in the process of reaching the unlocked state of FIG. 8B from the middle state of FIG. 8A. It is regulated so that it does not swing easily.

(3) FIG. 9 shows an operation example when the latch device after being forcibly removed as described above is used again. In this operation, as shown in FIG. 9A, the door-side striker 7 is pushed and moved in the direction of the arrow against the urging force as in the operation of FIG. 5, and the sliding member 2 is moved as shown in FIG. 9B. After slightly pushing into the case 1 against the urging force of 4, the pushing force in the direction of the arrow (a) (relative to the door-side striker 7) is released.

(4) Then, in this structure, first, when the sliding body 2 is pushed and moved to the left side (inside the case) with respect to the case 1 (b), the pin portion 5c of the trace member is the same (c ) And the release guide groove 27d is transferred to the release guide groove 27d, and the engagement reinforcing body 6 (releases the engagement between the recess 6b and the projection 20c) and accumulated in the elastic piece 6c described above. The shaft 6a is rotated in the clockwise direction by the force, that is, in the direction to release the biasing force. Subsequently, when the pushing force in the arrow direction (a) (relative to the door-side striker 7) is released, the sliding body 2 is moved by the urging force of the spring member 4 as indicated by the alternate long and short dash line in FIG. 1 is moved in the protruding direction, so that the state of FIG. 5 is again switched as the latch device.

  It should be noted that the present invention is not limited to the above-described embodiments, and can be variously changed as necessary as long as the requirements specified in the claims are provided. As an example, the structure in which the engaging body 3 is pivotally supported by the sliding body 2 is provided with a shaft portion instead of the shaft hole 29 in the sliding body 2, and a shaft hole is provided in the engaging body 3 instead of the shaft portion 35. Then, the engaging body 3 is pivotally supported with respect to the sliding body 2 through the fitting of the shaft portion and the shaft hole, and both the sliding body 2 and the engaging body 3 are provided with shaft holes. A configuration may be adopted in which the sliding body 2 is pivotally supported via a shaft inserted through the shaft holes. Further, the trace member and the cam groove may be configured as shown in FIG.

1 ... Case (11a is a guide groove, 16 is a protruding portion, 18 is a support shaft)
2 ... Sliding body (20 is a main body, 22 is an abutting portion, 23 is a shaft hole, 24 is an inside, 29 is a long hole)
3 ... engaging body (31 is a rear piece, 32 is a claw, 34 is a recess, 35 is a shaft)
4 ... Spring member (40 is a support shaft)
5 ... Trace member (5a is an attachment part, 5b is an arm part, 5c is a pin part)
6: Retaining reinforcement (6a is a shaft, 6b is a recess, 6c is an elastic piece, and 6d is a protrusion)
7 ... striker (engaged / disengaged member, 7a is a claw, 7b is a recess, 70 is a base)
8 ... Main body 9 ... Door 25 ... Rear extension (26 is a cylinder)
27 ... Cam groove (28 is a heart-shaped island, 27c is a locking groove)
33 ... Positioning part

Claims (6)

A case, a sliding member with a cam groove disposed in the case, a spring member for biasing the sliding member in a direction protruding from the case, and a tip side claw pivoted by the sliding member from the sliding member An engaging body that can be switched between a locking state that protrudes and locks the engaged / disengaged member and an unlocking state that retracts into the sliding body, and a trace member that moves in the cam groove, and the sliding body includes the spring In the latch device that is locked to the position after the movement through the cam groove and the trace member when moved against the biasing force of the member, and the engaging body is switched from the unlocked state to the locked state,
In the locking state pivotally supported by the sliding body and the engaging body locking the engaged / disengaged member, the unlocking direction is caused by the pulling force in the pulling direction of the engaged / disengaged member. A latch device having a locking reinforcing body for increasing a forced load that can accumulate an urging force as a swing resistance of the engaging body when swung to the right.   2. The latch device according to claim 1, wherein the locking reinforcement body includes an elastic piece portion that can press-contact the engagement body and accumulate an urging force. 3.   The locking reinforcement body and the sliding body have a convex portion provided on one side and a concave portion provided on the other side, and the engagement body is switched from the locked state to the unlocked state, The latch device according to claim 1, wherein the convex portion and the concave portion are detachably fitted to restrict swinging of the locking reinforcement body.   The locking reinforcing body has protrusions provided on both sides in the width direction, and the protrusion is assembled in a state of being fitted to a positioning part provided on the engagement body side. The latch device according to 2 or 3. The latch device according to claim 2, wherein the engagement body has a recess provided on a back surface side, and the elastic piece portion is disposed in the recess so as to be capable of being pressed and deformed.   The sliding body and the engaging body have a long hole provided on one side and a shaft portion provided on the other side, and the engaging body can move the shaft portion to the long hole with respect to the sliding body. The shaft is moved in the slot when the engaging body is pivoted in the unlocking direction by the pulling force in the pulling direction of the engaged / disengaged member. The latch device according to any one of claims 1 to 5.

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