JPH09301032A - Lock mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve lock strength by providing a slide cam permitting a latch to swivel in a lock direction also impeding the latch to swivel in an unlock direction. SOLUTION: A locked member 3 is brought into contact with a latch 7 and swiveled in a lock direction, to be locked. In the case of swiveling this latch 7 in a lock direction C, it is slid in a positive direction D by a slide cam 14, the latch 7 is permitted to swivel in the lock direction C. In the case of locking the locked member 3 by the latch 7, it is slid by the slide cam 14 in a reverse direction E, the latch 7 is impeded from swiveling in an unlock direction F. In this way, a contact surface of the slide cam 14 and the latch 7 can be largely taken, so that strength of a lock can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism for fixing, for example, a vehicle seat or door to a vehicle body or releasing the fixed state.

[0002]

2. Description of the Related Art As a lock mechanism of this type, for example, a lock mechanism 1 shown in FIGS. 24 and 25 is known for fixing an automobile seat to a vehicle body (for example, Japanese Utility Model Publication No. 6-28139). . The lock mechanism 1 is provided on a side portion of a seat frame (external support body) 2, and by raising a seat back droop 2a to a predetermined position, a striker (locked member of a vehicle body, not shown) ) It locks to 3.

That is, as shown in FIGS. 26 and 27, the lock mechanism 1 includes a housing 6 and the housing 6.
It is configured to include a latch 7, a locking cam 8, a spring 9 and a pressing rubber 10 provided inside.

The housing 6 comprises a base plate 4 and a cover plate 5. As shown in FIG. 25, the base plate 4 is formed in a cup shape having an upright bent portion over substantially the entire circumference, and is provided with a flange 41 for fixing to the seat frame 2 with a bolt 21. In addition, as shown in FIG. 26, the guide groove 4a for introducing the striker 3 is provided in the base plate 4.
Are formed.

As shown in FIGS. 26 and 27, the latch 7 is swingably provided on the housing 6 via a first shaft 11 and is unlocked by a spring 9 (an arrow shown in FIG. 27). It is urged by A). That is, the latch 7 swings in the lock position direction when the striker 3 contacts the lever surface 71, and the lock recess 72 locks the striker 3 in the guide groove 4a.

The locking cam 8 is swingably provided on the housing 6 via the second shaft 12 and is biased by the spring 9 in the locking direction (arrow B in FIG. 27). ing. That is, the locking cam 8 swings in the unlock direction by the latch 7 that swings in the lock direction, and then swings in the lock direction by the biasing force of the spring 9, so that the locking cam surface 81 abuts the lever surface 71. Thus, the latch 7 is prevented from swinging in the unlocking direction.
Further, the spring 9 has a lock cam surface 81 and a lever surface 7
An elastic force is applied to the latch 7 so that 1 is pressed. Therefore, the lock cam surface 81 and the lever surface 71 are pressed, and the state in which the striker 3 is locked by the latch 7 is maintained.

The pressing rubber 10 is elastically deformed when the striker 3 is locked in the locking recess 72. Therefore, the pressing rubber 10 prevents the striker 3 from rattling between the lock recess 72 and the guide groove 4a.

Further, in FIGS. 26 and 27, 13 is an unlock rod, and this unlock rod 13
27, the locking cam 8 is swung in the unlocking direction by pulling it in the direction of arrow H in FIG.
The lock cam surface 81 is detached from 1. That is, when the unlock rod 13 is pulled, the latch 7 can swing in the unlock direction. Also, the latch 7 that can swing
Oscillates in the unlocking direction by the spring 9, the striker 3 can be detached from the recess 72 of the latch 7 and the guide groove 4a, and the lock by the latch 7 is released.

[0009]

By the way, in the lock mechanism 1, since the latch 7 is swingable and the locking cam 8 is also swingable, the number of parts is large. There's a problem. Moreover, in order to prevent the latch 7 from swinging in the unlocking direction,
When the latch 7 and the locking cam 8 reach a predetermined swing angle, the lever surface 71 and the lock cam surface 81 come into contact with each other, so that the contact area between the lever surface 71 and the lock cam surface 81. Can not be taken large,
There was a problem that the strength of the lock was weak.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a locking mechanism capable of reducing the number of parts and improving the strength of the lock. .

[0011]

In order to achieve the above object, the present invention provides a latch that locks the locked member by rocking in the locking direction by abutting against the locked member, and the latch. When the latch locks the locked member, it slides in the opposite direction and slides in the positive direction to allow the latch to swing in the locking direction. And a slide cam for preventing the rocking in the direction.

It is preferable that a housing for accommodating the latch and the slide cam is provided, and the slide cam is provided slidably with respect to the housing.

It is preferable to provide an unlock rod which is connected to the slide cam and allows the latch to swing in the unlock direction by moving the slide cam in the positive direction.

It is preferable to provide a first spring for urging the latch in the unlocking direction and a second spring for urging the slide cam in the opposite direction.

It is preferable to provide a biasing means for pressing the locked member against the latch when the locked member is locked by the latch.

It is preferable that the first spring and the second spring are constituted by one torsion coil spring.

The housing is provided with a guide portion for guiding the unlock rod connected to the slide cam to the outside, and the slide cam is provided with a connecting portion for connecting the unlock rod at a position away from the guide portion. Is preferred.

The housing is composed of a base plate and a cover plate, and at least one of the base plate and the cover plate is
Reinforcing ribs are preferably provided along the guide groove for introducing the locked member, and connecting means for connecting the base plate and the cover plate are provided on the left and right of the guide groove.

The housing is composed of a base plate and a cover plate, and it is preferable that the base plate and the cover plate are provided with a sandwiching means for slidably sandwiching the latch.

The housing is composed of a base plate and a cover plate, and it is preferable that the base plate and the cover plate are provided with flanges for fixing to an external support at the mating surfaces thereof. .

The urging means is preferably composed of a plate having a tapered portion for pressing the locked member against the latch.

The tapered portion of the plate may be formed so as to be parallel to one side of the lock recess that holds the locked member when the locked member is locked in the lock recess of the latch. preferable.

The plate is preferably formed integrally with the slide cam.

In the above invention, the sliding cam is used to prevent or allow the latch to swing in the unlocking direction. Therefore, the second locking cam used conventionally is used. The axis of is unnecessary. Therefore, the number of parts can be reduced. Moreover,
Since the slide cam only moves on a certain slide line, the contact surface between the slide cam and the latch can be made large along this slide line. That is, the contact surface between the slide cam and the latch for preventing the latch from swinging in the unlocking direction can be made large. Therefore, the strength of the lock can be improved.

Further, in the case where a housing for slidably holding the slide cam is provided, the force for preventing the latch from swinging in the unlocking direction should be held by the housing via the slide cam. You can Therefore,
The strength of the lock by the latch can be further improved.

Further, in the case where the unlock rod is provided, the slide cam can be moved in the positive direction by moving the unlock rod in the positive direction. That is, the latch in the locked state can be easily switched to the unlocked state only by operating the unlock rod.

Further, in the case where the first spring and the second spring are provided, for example, when the latch locks the locked member, the second spring causes the slide cam to automatically reverse. Move in the direction,
It is possible to prevent the latch from swinging in the unlocking direction. Further, if the slide cam is moved in the positive direction against the force of the second spring, the latch can be automatically swung in the unlock direction by the first spring.

Further, in the case where the biasing means is provided,
Since the locked member can be pressed against the latch,
It is possible to prevent rattling of the locked member in the locked state.

Furthermore, in the case where the first spring and the second spring are composed of one torsion coil spring, the number of parts can be reduced.

Further, in the case where the housing is provided with a guide portion for guiding the unlock rod to the outside, and the slide cam is provided with the connecting portion for connecting the unlock rod at a position apart from the guide portion, the guide is provided. Since the distance between the portion and the connecting portion becomes long, the unlock rod can be held at a position separated between two points. Therefore, even if there is a play between the guide portion and the unlock rod or between the connecting portion and the unlock rod, the swing of the unlock rod can be suppressed to be small.

In at least one of the base plate and the cover plate of the housing, reinforcing ribs are provided along the guide groove, and connecting means for connecting the base plate and the cover plate are provided on the left and right of the guide groove. The reinforcing ribs and the connecting means can prevent the base plate and the cover plate from bending. That is, when the latch is pulled in the unlocking direction by the locked member, the deformation of the housing can be suppressed to be small. Therefore, since the latch, the slide cam, and the like can be securely held, it is possible to prevent the locked member from coming off the latch.

In the case where the base plate and the cover plate of the housing are provided with the holding means for holding the latch slidably, even if the latch is pulled obliquely by the locked member, the fall of the latch can be suppressed. it can. Therefore, the locked member can be prevented from coming off the latch.

In the case where both the base plate and the cover plate of the housing are provided with flanges for fixing to the external support, the mounting strength of the housing can be improved. Moreover, since both the base plate and the cover plate are fixed to the external supporting body, the strength of the housing itself can be improved.

When the urging means is constituted by a plate having a tapered portion for pressing the locked member against the latch, the durability can be improved as compared with the urging means such as rubber. .

In the plate in which the tapered portion is formed to be parallel to one side of the lock concave portion on which the locked member is held, the position of the locked member varies from side to side and front and rear. Even in such a case, rattling of the locked member can be reliably prevented.

When the plate is formed integrally with the slide cam, the number of parts and the cost can be reduced.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 8 are the first embodiment, FIG. 9 is the second embodiment, FIG. 10 is the third embodiment, FIG. 14 is the fourth embodiment, and FIGS.
FIG. 23 shows a fifth embodiment.

First, the first embodiment will be described with reference to FIGS. However, elements common to the constituent elements of the conventional example shown in FIGS. 24 to 27 are designated by the same reference numerals to simplify the description.

In FIG. 1, reference numeral 1 denotes a lock mechanism, and the lock mechanism 1 swings in the lock direction by coming into contact with a striker (locked member) 3 to cause the striker 3 to move.
And a latch 7 that locks the latch 7 in the positive direction (see FIG. 1) when the latch 7 swings in the locking direction (the direction of arrow C in FIG. 1).
Slide in the direction of arrow D) to allow the latch 7 to swing in the locking direction C, and when the latch 7 locks the striker 3, slide in the opposite direction (direction of arrow E in FIG. 1). Then, the slide cam 14 is provided to prevent the latch 7 from swinging in the unlocking direction (direction of arrow F in FIG. 1).

The slide cam 14 is formed in a long strip shape and has a pair of inclined surfaces 141 and a bottom surface 1 on the upper portion thereof.
42 and 42 form a symmetrical recess. A lock cam surface 143 is formed on the left and right of each inclined surface 141.

The latch 7 is swingably provided on the housing 6 via the shaft 11, and in the unlocked state (state of FIG. 1), one inclined surface 141 of the slide cam 14 is provided.
In addition to having the inclined surface 73 that is in stable contact with the lock cam surface 143, the lock surface 74 is in contact with the lock cam surface 143 of the slide cam 14 in the locked state (state of FIG. 2). The latch 7 has a torsion coil spring 15
Holes 75 for holding the intermediate bent portions 15a of the slide cams 14 are provided, and the unlock rods 13 or the torsion coil springs 15 are provided at both ends of the slide cam 14 at symmetrical positions.
A hole 144 for holding the bent portion 15b at one end is provided.

As shown in FIGS. 1 and 3, the torsion coil spring 15 has an intermediate bent portion 15a and one bent portion 15a.
A torsion spring portion 151 is formed between b and b. The torsion spring portion 151 urges the latch 7 in the unlocking direction F and the slide cam 14 in the reverse direction E. . Furthermore, torsion coil spring 1
5, a bending spring portion 152 as a biasing means extending from the intermediate bent portion 15a to the other end portion 15c is configured.
The bending spring portion 152 traverses the guide grooves 4a and 5a, and the holding hole 4b of the base plate 4 (see FIG. 3B).
And the other end 15c is held by the holding hole 4b. Then, the bending spring portion 152
When the striker 3 is locked by the latch 7, the striker 3 elastically bends to lock the striker 3 in the lock recess 72 of the latch 7.
Is pressed.

As shown in FIG. 4, the unlock rod 13 has a base end portion 13a bent at a right angle, and the base end portion 13a has one hole (connecting portion) 144 of the slide cam 14.
And is connected to the slide cam 14. Also, the other hole 1 of the slide cam 14
44 holds the one-end bent portion 15b of the torsion coil spring 15 as described above.

The housing 6 is composed of a base plate 4 and a cover plate 5. As shown in FIG. 5, the base plate 4 is a cup-shaped guide groove 4 having a standing bent portion on substantially the entire circumference except for the guide groove 4a.
It is formed symmetrically about a. The through holes 4c for holding the shaft 11 are also provided at symmetrical positions, so that the latch 7 can be provided at any of the left and right positions of the guide groove 4a. However,
When the latch 7 is arranged on the right side, the torsion coil spring 15 is arranged on the left side, and the unlock rod 13 is arranged on the right side.

Further, as shown in FIG. 6, the base plate 4 is provided with recesses 4d for guiding the unlock rods 13 on its left and right side surfaces. Further, a tongue piece 4e for connecting with the cover plate 5 is provided on the lower side surface.

As shown in FIG. 7, the cover plate 5 is provided with a guide groove 5a having the same shape as the guide groove 4a at the same position as the guide groove 4a of the base plate 4 and each of the through holes of the base plate 4. A through hole 5b is provided at the same position as the hole 4c. Furthermore, the cover plate 5
Two guide bending pieces 5c are provided on the right and left sides of the guide bending portion 5c, which are bent inside the recess 4d of the base plate 4 and slidably guide the unlock rod 13 in cooperation with the recess 4d. That is, the housing 6 is provided with a guide portion of the unlock rod 13 including the guide bending piece 5c and the concave portion 4d.

A connecting hole 5d for connecting with the tongue piece 4e of the base plate 4 is formed at the lower end of the cover plate 5, and the tongue piece 4e is inserted into the connecting hole 5d.
It is bent as shown in. And this connecting hole 5
As shown in FIG. 8, the portions on both sides of d are bent inward of the lower side surface of the base plate 4, and these portions slidably support the slide cam 14 so as to slidably support the slide wall surface 5.
e.

In the lock mechanism 1 constructed as described above, when the back droop 2a shown in FIG. 14 is raised,
The striker 3 enters the guide grooves 4a and 5a. Then, as shown in FIG. 1, the striker 3 comes into contact with the lever surface 71 of the latch 7, the latch 7 swings in the locking direction C, and the striker 3 is locked by the locking recess 72 and the guide groove 4a.
It will be in a locked state by being sandwiched with 5a. At this time, the inclined surface 73 of the latch 7 rotates while pushing the inclined surface 141 of the slide cam 14 and sliding the inclined surface 141 in the positive direction.
When 3 is separated from the inclined surface 141, the slide cam 14 slides in the reverse direction E by the spring force of the torsion coil spring 15, and the lock surface 74 of the latch 7 contacts the lock cam surface 143 of the slide cam 14. Therefore, the slide cam 14 first moves in the forward direction D and then moves in the reverse direction E by the spring force of the torsion coil spring 15.

When the lock surface 74 of the latch 7 contacts the lock cam surface 143 of the slide cam 14, the latch 7 cannot swing in the unlocking direction F. Therefore, the striker 3 is reliably locked by the lock recess 72 and the guide grooves 4a, 5a as shown in FIG. Further, when locked, the bending spring portion 152 of the torsion coil spring 15 contacts the striker 3 and bends, and the spring force of the bending spring portion 152 pushes the striker 3 against the lock recess 72.

Next, to unlock the locked state by the latch 7, the unlock rod 13 is pulled in the forward direction D. Then, since the slide cam 14 also moves in the positive direction, the lock surface 74 is disengaged from the lock cam surface 143, and the latch 7 swings in the unlock direction F by the spring force of the torsion coil spring 15. Therefore, striker 3
1 is in a state in which it can be freely removed from the guide grooves 4a, 5a, as shown in FIG.

According to the lock mechanism 1 configured as described above, the slide cam 14 prevents or allows the latch 7 from swinging in the unlocking direction F. The second shaft for the locking cam, which is conventionally used, is no longer necessary. Therefore, the number of parts can be reduced. Moreover, since the slide cam 14 only moves on a certain slide line, the contact surface between the slide cam 14 and the latch 7 can be made large along this slide line. That is, the latch 7
It is possible to increase the contact area between the lock surface 74 and the lock cam surface 143 in order to prevent the rocking of the lock surface in the unlock direction. Therefore, the strength of the lock can be improved.

Since the slide cam 14 is slidably held by the sliding wall surface 5e of the housing 6, the latch 7
A force for preventing the rocking of the rocking member in the unlocking direction can be held by the housing 6 via the slide cam 14. Therefore, the strength of the lock by the latch 7 can be further improved.

Furthermore, since the pulling direction of the unlocking rod 13 and the sliding direction of the slide cam 14 coincide with each other, it is possible to easily switch from the locked state to the unlocked state with a light force.

Further, since the striker 3 can be pressed against the lock recess 72 of the latch 7 by the bending spring portion 152 of the torsion coil spring 15, it is possible to prevent the striker 3 in the locked state from rattling.

Furthermore, the unlocking direction F of the latch 7
Biasing the slide cam 14 in the opposite direction E,
Since the single torsion coil spring 15 is used to urge the striker 3 against the lock recess 72, the number of parts can be further reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. However, the elements common to the first embodiment are given the same reference numerals, and the description thereof will be omitted. The second embodiment is different from the first embodiment in that the slide cam 1 has a connecting hole (connecting portion) 145 for connecting only the base end portion 13a of the unlock rod 13.
4 is the point.

That is, as shown in FIG. 9, the connecting hole 145 is formed so as to be located in the center between the left and right holes 144 and 144. For this reason, the connection hole 145 is in a state of being arranged at a position farthest from the guide portions 4d and 5c of the housing 6. Moreover, the connecting hole 145 can arrange the unlock rods 13 on the left and right sides under the same condition. The guide portion of the housing 6 is composed of the concave portion 4d and the guide bent piece 5c as described above.

According to the lock mechanism 1 configured as described above, the distance between the guide portions 4d and 5c and the connecting hole 145 can be lengthened, and the unlock rod can be placed at a position separated between two points. Can be held. Therefore, the guide portion 4
Even if there is a play between the unlocking rods 13 and d, or between the connecting hole 145 and the unlocking rod 13, the swinging of the unlocking rod 13 can be suppressed to be small.

Next, a third embodiment of the present invention will be described with reference to FIG. However, the elements common to the first embodiment are given the same reference numerals, and the description thereof will be omitted. The third embodiment is different from the first embodiment in that the torsion coil spring 15 has a torsion spring portion 15
It is configured by only one, and there is no bending spring portion 152 as a biasing means. Further, the holding hole 4b of the base plate 4 is also not provided. Others are the same as those in the first embodiment.

In this case, the biasing means for preventing the rattling of the striker 3 is not limited to the bending spring portion 152 of the coil spring 15, but the pressing rubber 10 may be attached to the cover plate 5 as shown in FIGS. 11 and 12. It may be mounted near the guide groove 5a to prevent the striker 3 from rattling. That is, as shown in FIG. 12, the cover plate 5 has a holding plate 5 that is bent rightward outward at a position directly below the guide groove 5a.
1 is formed by pressing, and the pressing rubber 10 is installed along the main body of the holding plate 51 and the cover plate 5. In addition, the pressing rubber 10 has a locking projection 10a formed on the back surface thereof, so that the cover plate 5
A locking hole 52 for engaging and holding the locking projection 10a is formed in the.

Further, the biasing means for preventing the rattling of the striker 3 is not limited to the elastic member such as the coil spring and the pressing rubber, and as shown in FIG. You may do it. The plate P has a substantially U shape, a hole corresponding to the connecting hole 145 of the slide cam 14 is formed at the lower end, a tapered portion P _{1 with} which the striker 3 abuts is formed at the upper end, and the latch 7 is formed. A straight portion P _{2 on} which the shaft 11 slides is formed.

The plate P is connected to the slide cam 14 by the unlock rod 13 and interlocks with the operation of the slide cam 14. At this time, the straight portion P ₂ of the plate P is slidably held between the shaft 11 of the latch 7 and the sliding surface 5e of the housing 6.

Therefore, when the striker 3 is locked by being sandwiched between the lock recess 72 of the latch 7 and the guide groove 4a of the base plate 4 and the guide groove 5a of the cover plate 5,
When there is a gap between the striker 3 and the striker 3, the plate P moves in the opposite direction (in the direction of arrow E in FIG. 13) by the spring force of the torsion coil spring 15 via the slide cam 14.
Move the striker 3 to the tapered portion P of the plate P.
_The striker 3 is sandwiched between ₁ and the lock recess 72 of the latch 7.
Prevents rattling.

Next, a fourth embodiment of the present invention will be described with reference to FIG. However, the elements common to the first embodiment are given the same reference numerals, and the description thereof will be omitted. The difference between the fourth embodiment and the first embodiment is that the first spring 16 for urging the latch 7 in the unlocking direction F and the slide cam 14 in the opposite direction (direction of arrow E in the figure). The second spring 17 for biasing the
The third spring 1 as an urging means for pressing the striker 3 against the latch 7 when the striker 3 is locked by
8 and 8 are separately provided.

Therefore, the latch 7 is provided with a hole 76 for holding one end of the first spring 16. Further, the slide cam 14 has a second spring 1
Holes 146 for holding one end portion of 7 are provided at symmetrical positions. The second spring 17 may be supported in the hole 144 as in the first embodiment.

Also in the lock mechanism 1 configured as described above, the striker 3 can be locked or unlocked as in the first embodiment.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. However, elements common to those of the first embodiment and those shown in FIG. 13 are designated by the same reference numerals, and the description thereof will be omitted. The fifth embodiment is different from the first embodiment and shown in FIG. 13 mainly in that the shape of the housing 6 is changed and the plate P is formed integrally with the slide cam 14. That is the point.

That is, the base plate 4 is shown in FIGS.
As shown in FIG. 19, the guide groove 4a has claws (connecting means) 4f on both sides, and the cover plate 5 has claws 4f.
A connecting hole (connecting means) 5f for connecting with is formed. As shown in FIG. 15, the claw 4f is bent after passing through the connecting hole 5f, and firmly connects the base plate 4 and the cover plate 5 together with the tongue piece 4e described above.

On the base plate 4, recesses (holding means) 4g are formed by drawing on the left and right of the guide groove 4a. The cover plate 5 includes a reinforcing rib 5g, a first surface portion 5h, a second surface portion 5i, and a third surface portion (holding means).
5j and a flange 5k. Reinforcing rib 5g
Is formed to be bent outward along the guide groove 5a. The third surface portion 5j is formed by drawing on the left and right of the guide groove 5a, and the second surface portion 5i is formed by drawing on the lower side of the third surface portion 5j and the guide groove 5a. Is. Then, the first surface portion 5h is formed in a flat shape at a position higher than the second surface portion 5i, and the second surface portion 5i is formed.
Is formed in a plane shape at a position higher than the third surface portion 5j.

The third surface 5j and the recess 4g are
As shown in FIG. 16, the latch 7 is slidably clamped from the left and right.

The flange 5k is formed by drawing so as to overlap the flange 41 of the base plate 4, and draws an arc on the first surface 5h, the second surface 5i and the third surface 5j. Is narrowed down. The flange 5k is formed in a flat shape at a position higher than the first surface 5h.

The rigidity of the housing 6 is improved by the recess 4g, the reinforcing rib 5g, the first surface 5h, the second surface 5i, the third surface 5j, and the flange 5k.

The plate P is formed integrally with the slide cam 14 as shown in FIGS. 20 and 21. The gap between the slide cam 14 and the plate P is held constant by an emboss 147 formed by pressing from the slide cam 14 side. On the other hand, as shown in FIG. 23, the tapered portion P1 of the plate P is provided on one side 72a of the lock recess 72 where the striker 3 is held when the lock recess 72 of the latch 7 locks the striker 3. It is formed to be parallel. FIG. 22 shows the state of the latch 7 before locking.

In the lock mechanism 1 configured as described above, since the base plate 4 and the cover plate 5 are connected at three positions by the two claws 4f and the tongue pieces 4e, the base plate 4 and the cover plate 4 are connected. 5 can be firmly connected. That is, the strength of the housing 6 can be improved.

Since the reinforcing rib 5g and the claws 4f and 4f are provided, the base plate 4 and the cover plate 5 can be prevented from bending. That is, the latch 7 is unlocked by the striker 3 (direction G in FIG. 15).
Since the deformation of the housing 6 can be suppressed to be small when it is pulled by, the latch 7, the slide cam 14 and the like can be reliably held, and the striker 3 can be prevented from coming off the latch 7.

Further, since the latch 7 is slidably sandwiched between the recess 4g of the base plate 4 and the third surface 5j of the cover plate 5, even if the latch 7 is pulled obliquely by the striker 3, the latch 7 It is possible to suppress the fall of. Therefore, even if the luggage hits the seat from the luggage compartment and the striker 3 is deformed at this time, the striker 3 can be prevented from coming off the latch 7.

Since both the base plate 4 and the cover plate 5 of the housing 6 are provided with flanges 41 and 5k for fixing to the seat frame (external support) 2 (see FIGS. 24 and 25), The strength with which the housing 6 is attached to the seat frame 2 can be improved. Moreover, since both the base plate 4 and the cover plate 5 are fixed to the seat frame 2, the strength of the housing 6 itself can be improved.

Further, since the plate P is formed integrally with the slide cam 14, the number of parts and the cost can be reduced.

The tapered portion P1 of the plate P is
Since the lock recess 72 is formed so as to be parallel to one side 72a of the side where the striker 3 is held,
Even if the position of the striker 3 varies from side to side and front and rear, it is possible to reliably prevent the locked member from rattling. Moreover, there is an advantage that the position of the plate P does not change and the position of the unlock rod 13 does not change even if the position of the striker 3 is left-right varied as shown in FIG.

In each of the above-described embodiments, the lock mechanism 1 is attached to the seat frame 2, but the lock mechanism 1 is configured to be attached to the door of the automobile or the like. It goes without saying that it is okay.

[0081]

According to the present invention, it is possible to prevent or allow the latch from swinging in the unlocking direction.
Since the operation is performed by the slide cam, the second shaft for the locking cam that has been used conventionally is unnecessary. Therefore, the number of parts can be reduced. Moreover, since the slide cam only moves on a certain slide line, the contact surface between the slide cam and the latch can be made large along the slide line. That is, the contact surface between the slide cam and the latch for preventing the latch from swinging in the unlocking direction can be made large. Therefore, the strength of the lock can be improved.

Further, in the case where the housing that holds the slide cam slidably is provided, the force that prevents the latch from swinging in the unlocking direction is held by the housing via the slide cam. You can Therefore,
The strength of the lock by the latch can be further improved.

Further, in the case where the unlock rod is provided, the slide cam can be moved in the positive direction by moving the unlock rod in the positive direction. That is, the latch in the locked state can be easily switched to the unlocked state only by operating the unlock rod.

Further, in the case where the first spring and the second spring are provided, for example, when the latch locks the locked member, the second spring causes the slide cam to automatically reverse. Move in the direction,
It is possible to prevent the latch from swinging in the unlocking direction. Further, if the slide cam is moved in the positive direction against the force of the second spring, the latch can be automatically swung in the unlock direction by the first spring.

Further, in the case where the biasing means is provided,
Since the locked member can be pressed against the latch,
It is possible to prevent rattling of the locked member in the locked state.

Furthermore, in the case where the first spring and the second spring are composed of one torsion coil spring, the number of parts can be reduced.

In the case where the housing is provided with a guide portion for guiding the unlock rod to the outside, and the slide cam is provided with a connecting portion for connecting the unlock rod at a position apart from the guide portion, Since the distance between the portion and the connecting portion becomes long, the unlock rod can be held at a position separated between two points. Therefore, even if there is a play between the guide portion and the unlock rod or between the connecting portion and the unlock rod, the swing of the unlock rod can be suppressed to be small.

In at least one of the base plate and the cover plate of the housing, reinforcing ribs are provided along the guide groove, and connecting means for connecting the base plate and the cover plate are provided on the left and right of the guide groove. The reinforcing ribs and the connecting means can prevent the base plate and the cover plate from bending. That is, when the latch is pulled in the unlocking direction by the locked member, the deformation of the housing can be suppressed to be small. Therefore, since the latch, the slide cam, and the like can be securely held, it is possible to prevent the locked member from coming off the latch.

In the case where the base plate and the cover plate of the housing are provided with the holding means for holding the latch slidably, even if the latch is pulled obliquely by the locked member, the fall of the latch can be suppressed. it can. Therefore, the locked member can be prevented from coming off the latch.

In the case where both the base plate and the cover plate of the housing are provided with the flanges for fixing to the external support, the mounting strength of the housing can be improved. Moreover, since both the base plate and the cover plate are fixed to the external supporting body, the strength of the housing itself can be improved.

When the urging means is constituted by a plate having a tapered portion for pressing the locked member against the latch, the durability can be improved as compared with the urging means such as rubber. .

In the case where the tapered portion of the plate is formed so as to be parallel to one side of the lock concave portion that holds the locked member, the position of the locked member varies from side to side and front and rear. Even in such a case, rattling of the locked member can be reliably prevented.

In the case where the plate is formed integrally with the slide cam, the number of parts and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a lock mechanism shown as a first embodiment of the present invention.

FIG. 2 is a front view showing a state in which the striker is locked by the lock mechanism.

3A and 3B are enlarged views showing the lock mechanism, in which FIG. 3A is a right side sectional view and FIG. 3B is a right side view.

FIG. 4 is a view showing the lock mechanism, which is taken along line IV-IV in FIG. 1.
Sectional view along the line.

FIG. 5 is a front view showing a base plate of the lock mechanism.

FIG. 6 is an enlarged right side view of a base plate of the lock mechanism.

FIG. 7 is a front view showing a cover plate of the lock mechanism.

FIG. 8 is an enlarged right side view of the cover plate of the lock mechanism.

FIG. 9 is a front view of a lock mechanism shown as a second embodiment of the present invention.

FIG. 10 is a front view of the lock mechanism shown as the third embodiment of the present invention.

FIG. 11 is a front view of a lock mechanism shown as another embodiment of each embodiment.

FIG. 12 is a view showing the lock mechanism, which is taken along line X in FIG.
Sectional drawing which follows the II-XII line.

FIG. 13 is a front view of a lock mechanism shown as another embodiment of each embodiment.

FIG. 14 is a front view of a lock mechanism shown as a fourth embodiment of the present invention.

FIG. 15 is a front view of a lock mechanism shown as a fifth embodiment of the present invention.

FIG. 16 is a right side view of the lock mechanism.

FIG. 17 is a front view showing a base plate of the lock mechanism.

FIG. 18 is a view showing a base plate of the lock mechanism, taken along line XVIII of FIG. 17;

FIG. 19 is a right side view showing a base plate of the lock mechanism.

FIG. 20 is a front view showing a plate and a slide cam of the lock mechanism.

FIG. 21 is a right side view showing a plate and a slide cam of the lock mechanism.

FIG. 22 is a front view of the essential parts showing the unlocked state of the lock mechanism.

FIG. 23 is a front view of a main part showing a locked state of the lock mechanism.

FIG. 24 is a perspective view showing a lock mechanism attached to a seat frame.

FIG. 25 is an enlarged perspective view of the lock mechanism.

FIG. 26 is a front view of a lock mechanism shown as a conventional example.

FIG. 27 is a front view showing a state in which the striker is locked by the lock mechanism.

[Explanation of symbols]

1 Lock Mechanism 3 Locked Member (Strike) 4 Base Plate 4a Guide Groove 4d Recess (Guide) 4f Claw (Connecting Means) 4g Recess (Clamping Means) 41 Flange 5 Cover Plate 5a Guide Groove 5c Guide Bending Piece (Guide) 5e Sliding wall surface 5f Connecting hole (connecting means) 5g Reinforcing rib 5j Third surface portion (holding means) 5k Flange 6 Housing 7 Latch 72 Lock recess 72a One side 10 Press rubber (biasing means) 14 Slide cam 15 Torsion coil Spring 16 First coil spring 17 Second coil spring 18 Third coil spring (biasing means) 144 Hole (connecting portion) 145 Connection hole (connecting portion) P plate (biasing means) P ₁ Tapered portion

Claims (13)

[Claims] 1. A latch that swings in a locking direction when it abuts a locked member and locks the locked member, and a latch that slides in a positive direction when the latch swings in the locking direction. A slide cam that allows the latch to swing in the locking direction, and when the latch locks the locked member, slides in the opposite direction to prevent the latch from swinging in the unlocking direction. Lock mechanism characterized by. 2. The lock mechanism according to claim 1, further comprising a housing for accommodating the latch and the slide cam, wherein the slide cam is provided slidably with respect to the housing. 3. An unlock rod, which is connected to a slide cam and allows the latch to swing in the unlock direction by moving the slide cam in the forward direction. Alternatively, the lock mechanism according to claim 2. 4. A first member for urging the latch in the unlocking direction.
Second spring for biasing the spring and slide cam in opposite directions
The lock mechanism according to claim 1, 2 or 3, wherein the spring is provided. 5. The urging means for pressing the locked member against the latch when the locked member is locked by the latch is provided, claim 1, claim 2, claim 3 or claim 4. The described locking mechanism. 6. The lock mechanism according to claim 4, wherein the first spring and the second spring are constituted by one torsion coil spring. 7. The housing is provided with a guide portion for guiding the unlock rod to the outside, and the slide cam is provided with a connecting portion for connecting the unlock rod at a position away from the guide portion. The lock mechanism according to claim 3, claim 4, claim 5, or claim 6. 8. The housing is composed of a base plate and a cover plate, and at least one of the base plate and the cover plate is provided with a reinforcing rib along a guide groove for introducing the locked member. 8. The lock mechanism according to claim 2, wherein connecting means for connecting the base plate and the cover plate are provided on the left and right sides of the groove. 9. The housing is composed of a base plate and a cover plate, and the base plate and the cover plate are provided with a holding means for holding the latch slidably. The locking mechanism according to any one of claims 2 to 8. 10. The housing is composed of a base plate and a cover plate, and the base plate and the cover plate are provided with flanges for fixing to an external support member at the mating surfaces thereof. The lock mechanism according to any one of claims 2 to 9, wherein: 11. The urging means is constituted by a plate having a tapered portion that presses the locked member against the latch.
The locking mechanism according to any one of 1. 12. The tapered portion of the plate is formed so as to be parallel to one side of the lock recess that holds the locked member when the locked member is locked in the lock recess of the latch. The locking mechanism according to claim 11, wherein: 13. The plate according to claim 11, wherein the plate is formed integrally with the slide cam.
The lock mechanism described in 2.