WO2013008792A1

WO2013008792A1 - Latch device

Info

Publication number: WO2013008792A1
Application number: PCT/JP2012/067510
Authority: WO
Inventors: 井爪　友治
Original assignee: 株式会社ニフコ
Priority date: 2011-07-13
Filing date: 2012-07-09
Publication date: 2013-01-17
Also published as: JP5789437B2; JP2013019222A

Abstract

This latch device is provided with: a sliding body that has a cam groove; a spring member that biases the sliding body in the direction of protrusion from a case; an engagement body that is pivotably supported at the sliding body and can switch between a locking state of protruding a tip claw from within the sliding body, thus locking an engaged/released member, and a locking disengagement state that retreats the tip claw into the sliding body; and a tracing member. When the sliding body is moved against the biasing force of the spring member, the sliding body is locked to the post-moving position via the cam groove and the tracing member, and the engagement body switches from the locking disengagement state to the locking state. The latch device has a locking reinforcement body that is for increasing forced withdrawal load and that can store biasing force while acting as the oscillation resistance for the engagement body when oscillating in the direction of locking disengagement by means of pulling force in the direction of withdrawal of the engaged/released member when in the locking state, in which the engagement body, which is pivotably and oscillatably supported at the sliding body, locks the engaged/released member.

Description

Latch device

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).

10 (a) and 10 (b) show a push-type latch device disclosed in Patent Document 1. FIG. 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 shown in FIG. 10B, which locks the striker 62 as a member, and the locking release state shown in FIG. 10A, where the claw portion 39 retracts from the abutting portion 32, are switched. 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 FIGS. 10A and 10B 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 trace member 6 is released from the locking groove of the cam groove 5 and 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. 4545711 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 due to external factors such as surface roughness and degree of sinking between the surfaces where the engaging body side claw portion 39 and the opening 33 are in contact with each other. Further, in the conventional structure, if an undercut step or the like is provided in the shape of the engaging body side claw portion 39 in order to increase the force of unloading, normal operation such as the claw portion 39 being caught on the opening 33 side is likely to be impaired. 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 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 provides a case, a sliding body with a cam groove disposed in the case, a spring member for biasing the sliding body in a direction protruding from the case, and a pivot on the sliding body. An engaging body that can be switched between a locked state in which the front-end claw projects from the sliding body to lock the engaged / disengaged member and an unlocked state in which it is retracted into the sliding body, and a trace member that moves in the cam groove When the sliding body is moved against the urging force of the spring member, the sliding body is locked at the moved position via the cam groove and the trace member, and the engaging body is locked from the unlocked state. In the latch device that is switched to a state, the latch device is pivotally supported by the slide body so that the engagement body is engaged with the engagement / disengagement member, and the engagement / disengagement member is pulled out. When it is swung in the unlocking direction by the pulling force of Providing in that latching device has a locking reinforcement for storable excessive extraction load increase an urging force by a rocking body resistance. In addition, the above locking reinforcement body becomes releasable with the movement which resisted the urging | biasing force stored above against the urging | biasing force of the spring member of a sliding body.

The above-mentioned present invention is more preferably embodied as follows. That is,
(A) The locking reinforcing body has an elastic piece portion capable of accumulating an urging force by being pressed against the engaging body. In this preferred embodiment, since the locking reinforcement body has an elastic piece portion that presses against the engagement body, for example, by changing the thickness, length, inclination, etc. of the elastic piece portion, the size according to the application It is possible to easily set the unreasonable unloading load.
(A) 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. Thus, the convex portion and the concave portion are detachably fitted to restrict swinging of the locking reinforcement body. In this preferred embodiment, the locking reinforcement body is swung by fitting a convex portion and a concave portion provided between the sliding body and the engaging body while the engaging body is switched from the locked state to the unlocked state. The restriction is made so that the corresponding portion can be easily bent or the elastic force can be obtained efficiently.
(C) The locking reinforcing body has protrusions provided on both sides in the width direction, and the protrusions are assembled in a state of being fitted to positioning parts provided on the engagement body side. In this preferred embodiment, the correct positional relationship of the locking reinforcement body with respect to the engaging body is maintained while being pivotally supported by the sliding body, whereby the corresponding portion is always bent by the same value or an elastic force can be obtained.

(D) The engagement body has a recess provided on the back side, and the elastic piece is disposed in the recess so as to be capable of being pressed and deformed. In this preferred embodiment, since the elastic piece portion of the locking reinforcement body is disposed in the recess of the engagement body, it is easy to secure a space for arranging the elastic piece portion, and stable press deformation can be obtained.
(E) 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 turns the shaft portion into the long hole with respect to the sliding body. It is pivotally supported in a movably fitted state, and when the engaging body is swung in the unlocking direction by the pulling force in the pulling direction of the engaged / disengaged member, the shaft portion is in the elongated hole. It is a configuration that moves. In this preferred embodiment, for example, it is possible to alleviate an excessive load caused by excessive force and to suppress the generation of a buffer sound.

In the present invention, in a locked state in which the engaging body locks the engaged / disengaged member (the trace member is locked in the cam groove), a load of a certain value or more is received in the forcibly removing direction via the engaged / disengaged member. The engaging body tries to rotate in the unlocking direction, and at that time, it resists the elasticity or urging force of the locking reinforcing body, that is, the elastic force of the locking reinforcing body is rotated while accumulating the urging force. Unlock the removal member.

For this reason, in the present invention, the locking reinforcement body elastically bends when forcibly removed and acts as a swinging resistance of the engaging body, and the locking reinforcement body bends during normal operation without forcible removal. Since there is no locking reinforcement, it operates as smoothly as when there is no 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.

The relationship between the latch device and the striker of the embodiment of the present invention is shown, (a) is a schematic view seen from the front with the striker unlocked, (b) is the outline seen from the rear with the striker locked. FIG. 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 (a) to 3 (b) show the structure of the latch device, FIGS. 4 (a) and 4 (b) show usage examples of the latch device, and FIGS. 5 (a) to 9 (c) show the latch device. The operation of is shown. In the drawings, details are schematically shown 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 (a) to 4 (b) includes a flat container-like case 1, a contact portion 22 and a cam groove 27 that come into contact with a striker 7 as a member to be engaged and disengaged. And has a sliding body 2 arranged so as to be able to advance and retreat with respect to the case 1, and is pivotally supported so as to be able to swing with respect to the sliding body 2. An engaging body 3 that can be switched to a locking state that enables and an unlocking state that retracts from above the abutting portion 22, a spring member 4 that urges the sliding body 2 in a direction to protrude from the case 1, and a cam A trace member 5 that swivels through the groove 27 and a locking reinforcement body 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.

The above latch device is, for example, a door 9 attached to the main body 8 side of the equipment shown in FIGS. 4 (a) and 4 (b) and is used to disengage the striker 7 attached to the door 9. Is pushed in the closed position direction against the biasing force of the biasing means (not shown), the door 9 is locked via the striker 7, and when the door 9 is further pushed in the same direction to release the pressing force, the striker 7 Release the lock. 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. 1A, 1B and 2 and FIGS. 5A, 5B, the case 1 has upper and

lower walls

10, 11 and both side walls 12 and a rear bottom wall. 13 is formed in a substantially cylindrical shape. 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 has a through slit 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 entrance / exit side to the front of the slit 11a, and both inner surfaces. A projecting portion 16 that protrudes to enable the engaging body 3 to rotate in the unlocking direction and a positioning portion (not shown) that positions the support shaft 40 that is provided on the rear side and holds the spring member 4 are provided. ing. 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 3A and 3B, the sliding body 2 includes a substantially rectangular container-shaped main body 20 disposed on the entrance / exit side of the case 1, and protrudes rearward from the main body 20 so as to be narrower than the main body 20. And the rear extension 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. A convex portion 20c extending in the width direction is provided on the outer surface of the lower surface 21c as shown in FIGS.

The rear extension 25 is composed of an upper part forming a heart-shaped cam groove 27 and a lower cylindrical part 26 extending in the same direction as the upper part. 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.

The engaging body 3 includes a front plate portion 30 and

rear piece portions

31 and 31 on both sides protruding rearward from the front plate portion 30 as shown in FIGS. 2 and 3A and 3B. The front plate portion 30 has a claw portion 32 protruding upward, a concave portion 33 (functioning as a positioning portion) provided on both sides and opened forward or upward, and a rectangular hollow shape provided on the back side. A recess 34 and a projecting piece 38 that protrudes in the middle of the left and right of the rear end surface and enters the cylinder of the cylinder 26 are 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 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, and thereby rattling is absorbed, Centering is possible.

As shown in FIGS. 3 (a) and 3 (b), the locking reinforcement body 6 has a schematic shape that covers the upper part of the back surface of the engagement body-side front plate portion 30, and is provided on both side surfaces so as to protrude into the shaft hole 23 on the sliding body side. The shaft portion 6a to be fitted, the concave portion 6b provided on the front upper side to be engaged with and disengaged from the sliding body side convex portion 20c, and the concave portion 34 provided on the rear lower side and described above are loosely fitted. Or a plurality of elastic piece portions 6c to be inserted, protrusions 6d that protrude from both sides in substantially the same direction as the elastic piece portions 6c and fit into the above-described concave portion 33 on the engagement body side, It has a circular arc part 6e that is curvedly formed on the opposite side of the protruding part 6d and covers the back side of the front plate part 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 engagement body 3 and the sliding body 2 with the locking reinforcement 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 34 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 FIGS. 8 (a) and 8 (b), the locking reinforcement body 6 swings the engagement body 3 when the engagement body 3 is swung in the locking release direction by the pulling force of the striker 7 in the pulling direction. When the striker 7 is pulled out of the engagement body 3, the engagement body 3 is switched to the locked state again by the accumulated biasing force.

(Operation) As described above, the latch device described above is positioned on the equipment-side main body 8 in accordance with the striker 7 attached to the door 9 as illustrated in FIGS. It is attached. 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 is submerged 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 FIGS. 6 (a) and 6 (b), 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 by the pin portion 5c of the tracing member. When the pressing force in the direction of the left arrow in FIGS. 5A and 5B is released, it is locked in the locking groove 27c. By this engagement, the door 9 is locked and held in the closed state.

Also, when switching from the above-mentioned door holding state to the released state shown in FIGS. 5 (a) and 5 (b), after slightly pushing the door 9 in the closing direction, the pushing force is released. 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. 7 (a) to 9 (c).

(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. ing. 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 engaging body 3 absorbs the gap a between the claw portion 32 and the corresponding portion of the opening 21a shown in FIG. 5A, and the shaft portion 35 moves from the front side to the rear side in the elongated hole 29. Further, 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, and therefore in the engagement body side recess 34 as shown in FIG. The elastic 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) FIGS. 9A to 9C show operation examples 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 arrow direction of FIG. 9B is slightly pushed into the case 1 against the urging force of the spring member 4 as shown in FIG. 9B, and then the pushing force in the direction of the arrow in FIG. 9A (relative to the door 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) as shown in FIG. 9B, the pin portion 5c of the trace member is moved to FIG. As shown in (c), the locking groove 27c shifts to the release guiding groove 27d, and the locking reinforcing body 6 (releases the engagement between the concave portion 6b and the convex portion 20c) and accumulates in the elastic piece portion 6c. The urging force rotates around the shaft portion 6a as a fulcrum in the clockwise direction, that is, in the direction to release the urging force. Subsequently, when the pushing force in the arrow direction in FIG. 9A (relative to the door-side striker 7) is released, the urging force of the spring member 4 as shown by the one-dot chain line in FIG. Is moved from the case 1 in the protruding direction, whereby the latch device is again switched to the state shown in FIGS.

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 in place of the long hole 29 in the sliding body 2, and a shaft hole in place of the shaft portion 35 in the engaging body 3. 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 FIGS.
The entire contents of the specification, claims, drawings, and abstract of Japanese Patent Application No. 2011-155001 filed on July 13, 2011 are cited herein as disclosure of the specification of the present invention. Incorporated.

Claims

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 has an elastic piece portion capable of accumulating an urging force by being pressed against the engagement body.
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 said engaging body has a recessed part provided in the back side, The said elastic piece part is arrange | positioned in the said recessed part so that a press-contact deformation is possible, The any one of Claim 2 to 4 characterized by the above-mentioned. Latch device.
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, wherein: