JP2022178631A - door latch device - Google Patents

Abstract

To prevent a door from opening unintentionally upon application of an impact force without inviting problems of responsiveness or equipment downsizing.SOLUTION: A door latch device with a latch unit 10 and a link lever 30, which includes: a weight 51 movably arranged in a housing 1 and maintained in a normal position by urging force of an urging spring 52; the urging spring 52 being normally maintained in the force accumulation state by engaging an engagement pawl 50a, and being configured to, on the other hand, when the force accumulation state is released, shift the link lever 30 from an unlocked state to a locked state and maintained in the resulting state; and an engaging arm 51a that disengages the engagement pawl 50a from the urging spring 52 when the weight 51 moves against the urging force of the urging spring 52 when the urging force of the urging spring 52 is in its force accumulation state.SELECTED DRAWING: Figure 6

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door latch device that prevents a door from being accidentally opened even when an impact such as a collision is applied to a vehicle.

2. Description of the Related Art Some door latch devices for keeping a door closed with respect to a vehicle are configured to prevent the door from opening unintentionally even when an impact force such as a collision is applied. For example, Japanese Patent Application Laid-Open No. 2002-200000 discloses an inertial lever that is arranged to move between a blocking position and a retracted position with respect to a link lever that unlatches a latch unit. In this door latch device, when an impact force is applied, the inertia lever moves from the retracted position to the blocked position, thereby shifting the link lever from the unlocked state to the locked state and maintaining that state. To prevent a situation in which the door is carelessly opened.

Japanese Patent Application Laid-Open No. 2020-90828

By the way, in a door latch device configured to shift the link lever from the unlocked state to the locked state by moving the inertia lever, it is necessary to secure a large moving distance of the inertia lever. That is, in order not to affect the operation of the link lever in the retracted position, the inertia lever must be positioned outside the operating range of the link lever. Therefore, when an impact force is applied, it is necessary to move the inertia lever until it moves from the unlocked state to the locked state after moving the inertia lever to the operating range of the link lever. The moving distance of the lever is unavoidably long. As a result, for example, it takes some time for the link lever of the door latch device to be locked from the time when the impact force is applied. There are concerns about it.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a door latch device that can prevent the door from being accidentally opened when an impact force is applied without causing problems related to responsiveness and downsizing of the device. intended to

In order to achieve the above object, a door latch device according to the present invention enters a latched state when a door is closed with respect to a vehicle body, restricting movement of the door in an opening direction with respect to the vehicle body, and an unlatched state. a latch unit that allows the door to move in the opening direction with respect to the vehicle body, and a latch unit that is provided in the device body so as to shift to an unlocked state and a locked state when the door is unlocked. A door latch device comprising: a link lever that shifts the latch unit to an unlatched state when the door is opened, and maintains the latch unit in the latched state in the locked state even when the door is opened. a weight that is movably disposed in the apparatus main body and maintained at a normal position by the biasing force of the weight biasing member; an urging member that urges the link lever to shift from the unlocked state to the locked state and maintain the state when the urging member is in a state where the weight body is the weight when the force is accumulated in the urging member and an accumulated force release mechanism for canceling the accumulated force state of the urging member when the body urging member moves against the urging force of the body urging member.

Further, in the door latch device of the present invention, the link lever is arranged to be rotatable and slidable with respect to the device main body, and is switched between an unlocked state and a locked state by rotating and unlocked. The apparatus body is provided with an engaging claw for maintaining the biasing member in a force-accumulated state, and the force-accumulated releasing mechanism is provided on the weight, and engages with the biasing member when the weight moves against the biasing force of the weight biasing member, thereby releasing the engagement state with the engaging claw It is characterized by having an arm portion.

Further, in the door latch device of the present invention, when the link lever is slid in the locked state, the biasing member, which is disengaged from the engaging claw, is bent to engage with the engaging claw. It is characterized in that it has an engagement guide surface for moving so as to engage, and the spring force of an unlock spring that biases the link lever toward the unlocked state acts on the link lever.

Further, in the door latch device of the present invention, the biasing member is engaged with the engaging pawl via one of the arm portions, and when the engagement state with the engaging pawl is released, the biasing member engages the arm. a torsion coil spring that presses the link lever via a portion, and the apparatus main body includes a torsion coil spring so that the arm portion engages the engaging claw when the biasing member is bent by the link lever. It is characterized in that an engaging return portion for guiding is provided.

Further, according to the present invention, in the door latch device described above, the biasing member also has a function of maintaining the weight in the normal position.

Further, according to the present invention, in the door latch device described above, the biasing member is a torsion coil spring having a spirally wound coil portion and two arm portions radially extending from both ends of the coil portion. The weight body is maintained in the normal position by the axial spring force of contraction of the coil portion, and the torsional spring force through the two arms rotates the link lever toward the locked state. It is characterized by

According to the present invention, when the weight body moves against the biasing force of the weight body biasing member due to the impact force, the force accumulation state of the biasing member is released by the force accumulation release mechanism, and the link lever is released from the unlocked state. Since the locked state is maintained and the locked state is maintained, the accidental opening of the door is prevented. Moreover, the above-described operation can be performed by simply releasing the force-accumulating state of the biasing member, and can be performed instantaneously without requiring a member for moving the range from the unlocked state to the locked state of the link lever. As a result, not only is it advantageous in terms of responsiveness after an impact force is applied, but it is also advantageous in miniaturization because it is not necessary to secure a large space inside the door latch device.

FIG. 1 is a perspective view of a door latch device according to an embodiment of the present invention as seen from the rear side of a vehicle. FIG. 2 is a perspective view of the internal configuration of the door latch device shown in FIG. 1 as seen from the rear side of the vehicle. FIG. 3 is a rear view of the internal configuration of the door latch device shown in FIG. 1 as seen from the rear side of the vehicle. FIG. 4 is a side view of the internal configuration of the door latch device shown in FIG. 1 as seen from the inside of the vehicle, when the lock unit is in an unlocked state. FIG. 5 is a side view of the internal configuration of the door latch device shown in FIG. 1 as seen from the inside of the vehicle, when the lock unit is in the locked state. FIG. 6 is a side view of the internal configuration of the door latch device shown in FIG. 1 as seen from the inside of the vehicle, when an impact force is applied to the lock unit in the unlocked state. FIG. 7 shows the link lever, weight body, and biasing member of the door latch device shown in FIG. 1 as viewed obliquely from the rear side of the vehicle. b) is a perspective view when an impact force is applied; FIG. 8 shows the link lever, the weight body and the biasing member of the door latch device shown in FIG. 1 as viewed from above the vehicle. FIG. 4 is a plan view when force is applied; FIG. 9 shows the link lever, weight body and biasing member of the door latch device shown in FIG. 1 as viewed from the inside of the vehicle. is a side view when an impact force is applied; 10 is a side view of the link lever, the weight body and the biasing member of the door latch device shown in FIG. (b) is a side view when the handle is opened after the impact force is applied. FIG. 11 is an enlarged side view of the engaging claw, biasing member, and weight of the door latch device shown in FIG. 1, viewed from the inside of the vehicle.

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a door latch device according to the present invention will be described in detail below with reference to the accompanying drawings.
1 to 5 show a door latch device according to an embodiment of the invention. Although not shown in the drawings, the door latch device illustrated here is mounted on a side door of a front hinge arranged on the right side of a four-wheeled vehicle, and is operated by a door handle to open or lock/unlock a key. The opening and closing of the side door is controlled by changing the state of engagement with a striker provided on the side door. The detailed configuration of the door latch device will be described below, but for the sake of convenience, the orientation of each component will be specified when the device is mounted on a vehicle. In this door latch device, a latch unit 10 and a lock unit 20 are provided inside a housing 1, which is the main body of the device.

The latch unit 10 comprises a latch 12 rotatably disposed via a latch shaft 11 and a ratchet 14 rotatably disposed via a ratchet shaft 13 . The latch shaft 11 and ratchet shaft 13 extend substantially horizontally along the front and rear of any vehicle. In the illustrated example, a latch shaft 11 is provided at a portion above the vehicle with respect to the striker entry groove 2 provided in the housing 1, and the latch shaft 11 is provided at a portion below the vehicle with respect to the striker entry groove 2. A ratchet shaft 13 is provided at a portion on the inner side of the vehicle. When the side door is closed, a striker (not shown) enters the striker entry groove 2 from the inside of the vehicle.

The latch 12 has a striker contact portion 12a and a hook portion 12b, and is biased in the unlatching direction (clockwise in FIG. 3) by the spring force of a latch spring (not shown) to be placed in the unlatched state. . The unlatched state is a state in which the hook portion 12b is retracted upward with respect to the striker insertion groove 2, while the striker contact portion 12a is arranged on the inner side (outer side) of the striker insertion groove 2. When the side door is closed in the unlatched state, the striker entering the striker entrance groove 2 comes into contact with the striker contact portion 12a, thereby rotating the latch 12 counterclockwise in FIG. 3 against the spring force of the latch spring. , the hook portion 12b is arranged across the open end of the striker entrance groove 2. As shown in FIG.

The ratchet 14 prevents the latch 12 from rotating in the unlatching direction by engaging with the hook portion 12b when the hook portion 12b of the latch 12 is placed across the striker entrance groove 2. . The ratchet 14 is urged in the direction of engagement with the latch 12 (counterclockwise in FIG. 3) by the spring force of a ratchet spring (not shown). Therefore, when the striker enters the striker entry groove 2 and the hook portion 12b of the latch 12 is arranged to traverse the striker entry groove 2, the ratchet 14 is engaged with the hook portion 12b by the spring force of the ratchet spring. state), and that state will be maintained.

The ratchet 14 is integrally provided with a ratchet lever 14a. The ratchet lever 14a extends forward of the vehicle from a portion of the ratchet 14 located inward of the ratchet shaft 13 . When the ratchet lever 14a is moved upward against the spring force of the ratchet spring, the ratchet 14 rotates clockwise in FIG. The latch 12, which has been disengaged from the ratchet 14, returns to the unlatched state by the spring force of a latch spring (not shown).

A link lever 30 is arranged inside the housing 1 at a portion below the ratchet lever 14a. The link lever 30 has a support engagement hole 31 at one end and an engagement groove 32 along the length at the other end. It is arranged in the housing 1 so that it can move along the direction of the vehicle and can be rotated about the axis in the direction along the left and right of the vehicle by the operation of the lock unit 20 to change between the unlocked state and the locked state. In the drawing, dots are applied to the link lever 30 to clarify its shape.

The outside handle lever 41 is rotatably disposed below the ratchet shaft 13 by an outside lever shaft 41a along the front and rear of the vehicle. Although not shown in the figure, the outside door handle of the side door is linked to the end of the outside handle lever 41 located on the outside of the vehicle via an operating force transmission member such as a rod or cable. There is. An end portion 41b of the outside handle lever 41 located on the inner side of the vehicle is engaged with the support engagement hole 31 of the link lever 30, and only relative rotation is possible. When the outside door handle is operated to open, the outside handle lever 41 is rotated clockwise in FIG. will move. When the opening operation of the outside door handle is stopped, the outside handle lever 41 rotates counterclockwise by the spring force of a return spring (not shown), and the link lever 30 moves downward to return to the normal position.

The inside handle lever 42 is rotatably disposed below the link lever 30 by an inside lever shaft 42a along the left and right sides of the vehicle. facing the lower end surface of the Although not shown in the drawing, the lower end of the inside handle lever 42 is linked to the inside door handle of the side door via an inside cable 43 . When the inside door handle is opened, the inside handle lever 42 is rotated clockwise in FIG. will move towards When the opening operation of the inside door handle is stopped, the spring force of a return spring (not shown) rotates the inside handle lever 42 counterclockwise, and the link lever 30 moves downward to return to the normal position.

The lock unit 20 includes a lock lever 22 and a sub-lock lever 23 that rotate about the axis of a lock shaft 21 along the left and right sides of the vehicle. The lock lever 22 and the sub-lock lever 23 can relatively rotate about the axis of the lock shaft 21 within the range of an arc-shaped guide groove 22 a provided in the lock lever 22 . An unlock spring 24 is provided between the lock lever 22 and the sub-lock lever 23 to urge the lock lever 22 to rotate the sub-lock lever 23 clockwise in FIG. The sub-lock lever 23 is linked to the link lever 30 by engaging the protrusion 23 a with the engagement groove 32 .

An electric motor 25 and a lock cable 26 are connected to the lock lever 22 . The electric motor 25 performs locking and unlocking operations by operating a remote controller owned by a vehicle user. Locking and unlocking operations of the electric motor 25 are transmitted to the lock lever 22 via the worm gear 27 and the worm wheel 28 . The lock cable 26 is directly connected to the lock lever 22 , although it is not shown in the drawing, and is locked and unlocked by operating a lock knob provided on the side door. In this lock unit 20, when the electric motor 25 or the lock cable 26 is unlocked, the link lever 30 rotates clockwise in FIG. It will be in an upright unlocked state. On the other hand, when the electric motor 25 or the lock cable 26 is locked, the link lever 30 rotates counterclockwise through the lock lever 22 and the sub-lock lever 23, and as shown in FIG. The upper end is in a locked state in which it is tilted forward.

As shown in FIGS. 7 to 11, the door latch device has a weight 51 and a biasing spring (biasing member: weight biasing member) 52 inside a case (apparatus body) 50 attached to the housing 1. is provided. The weight body 51 is arranged outside the link lever 30, behind the outside handle lever 41, and below the ratchet 14, and is movable only in the lateral direction with respect to the case 50. It is arranged so that

The biasing spring 52 is a torsion coil spring having arm portions 52b and 52c at both ends of a spirally wound coil portion 52a. are also arranged in the lower part. As the urging spring 52, one having a spring force greater than that of the unlocking spring 24 is used. That is, when the link lever 30 in the unlocked state is pressed toward the locked state, the biasing spring 52 moves the link lever 30 to the locked state against the spring force of the unlock spring 24, and The spring force is set so that the state can be maintained. An arm portion positioned on the outer side of the urging spring 52 (hereinafter referred to as an outer arm portion 52 b for distinction) is engaged with the weight body 51 . The weight body 51 locked to the outer arm portion 52b is maintained at the normal position on the inner side with respect to the case 50 by the spring force of the biasing spring 52 (the axial spring force with which the coil portion 52a contracts). will be An arm portion positioned on the inner side of the biasing spring 52 (hereinafter, referred to as an inner arm portion 52c for distinction) extends upward from the coil portion 52a to extend upward from the upper end of the case 50. It protrudes, and its upper end is bent inward at a substantially right angle to form a pressing contact portion 52d. The inner arm portion 52c is detachably engaged with an engaging claw 50a provided on the case 50. As shown in FIG.

The engaging claw 50a is formed at the front end portion of the wall portion located on the inner side of the case 50, and protrudes outward from the surface facing outward. As shown in FIG. 8, the engaging claw 50a has an engaging surface 50b on the rear side and an engaging guide surface 50c on the front side. The locking surface 50b extends substantially perpendicularly to the front-rear direction, and maintains the urging spring 52 in a torsionally bent state when the inner arm portion 52c is engaged. In addition, the pressing contact portion 52d can be kept separated from the link lever 30 in the unlocked state. When the inner arm portion 52c is deviated from the locking surface 50b, the inner arm portion 52c moves forward due to the torsional spring force of the urging spring 52, and the pressing contact portion 52d moves toward the link lever. By pressing the link lever 30 from the rear side, the unlocked state of the link lever 30 can be switched to the locked state. The engagement guide surface 50c extends so as to incline gradually toward the front. This engagement guide surface 50c is more flexible than the inner arm portion 52c when the inner arm portion 52c of the urging spring 52 deviates from the locking surface 50b and the pressing contact portion 52d is in contact with the link lever 30. It is arranged so as to face the inner arm portion 52c on the rear side.

Further, in the door latch device, the weight body 51 is provided with the engagement arm portion 51a, and the link lever 30 is provided with the engagement return portion 33. As shown in FIG. The engaging arm portion 51a extends forward from the front portion of the portion located on the inner side of the weight body 51 . The engaging arm portion 51a is arranged inside the inner arm portion 52c of the biasing spring 52 in a state where the engaging surface 50b of the case 50 is engaged with the engaging surface 50b of the case 50. moves outward relative to the case 50, the inner arm portion 52c can move outward.

The engagement return portion 33 is provided on the edge portion located on the rear side of the link lever 30, and projects downward so as to gradually incline rearward even when the link lever 30 is in the locked state. . The engagement return portion 33 is located below the pressing contact portion 52d deviating from the engaging surface 50b when the link lever 30 is placed downward in the locked state, and the link lever 30 is positioned upward from this state. , it can abut against the pressing abutment portion 52d. When the link lever 30 moves upward while the pressing contact portion 52d is in contact, the tilting action of the engagement return portion 33 causes the pressing contact portion 52d to gradually move rearward.

In the door latch device constructed as described above, when the inner arm portion 52c is engaged with the locking surface 50b, the biasing spring 52 is bent in the torsional direction and maintained in a state of being pressed and abutted. The portion 52 d is kept separated from the link lever 30 . Therefore, when the electric motor 25 or the lock cable 26 is unlocked, the link lever 30 is placed in the unlocked state as shown in FIG. If the latch unit 10 is in an unlatched state, the side door can be opened.

When the electric motor 25 or the lock cable 26 is locked, the link lever 30 is tilted forward via the lock lever 22 and the sub-lock lever 23 as shown in FIG. Even when it rises, it does not come into contact with the ratchet lever 14a. Therefore, even if the outside door handle or the inside door handle is opened, the ratchet 14 remains engaged with the latch 12, so that the side door is kept closed with respect to the vehicle body.

On the other hand, in the door latch device described above, an impact force is applied to the vehicle body in the unlocked state, and the weight body 51 is temporarily moved against the spring force of the urging spring 52 (the axial spring force with which the coil portion 52a contracts). When the weight body 51 moves outward, the engagement arm portion 51a moves outward together with the weight body 51. As shown in FIG. Therefore, when the weight body 51 moves outward, the inner arm portion 52c also moves outward via the engagement arm portion 51a, and eventually engages with the inner arm portion 52c of the urging spring 52. The engagement state with the surface 50b is released. As a result, as shown in FIG. 6, the pressing contact portion 52d of the biasing spring 52 comes into contact with the link lever 30, and the link lever 30 is switched to the locked state by the torsional spring force of the biasing spring 52. and is kept locked. Therefore, in this state, even if the outside door handle or the inside door handle is operated to open, there is no concern that the side door will be opened inadvertently.

Moreover, the above-described operation can be performed by moving the weight body 51 only by disengaging the inner arm portion 52c of the biasing spring 52 from the engaging surface 50b of the engaging claw 50a. The link lever 30 is instantly shifted from the unlocked state to the locked state by the torsional spring force of the spring 52, and a separate member for moving the link lever 30 from the unlocked state to the locked state is not required. . As a result, not only is it advantageous in terms of responsiveness from the time an impact force is applied until the link lever 30 shifts to the locked state, it is also not necessary to secure a large space inside the door latch device, which contributes to miniaturization. It is advantageous in planning. In particular, in the door latch device of the present embodiment, the link lever 30 is pressed by the torsional spring force of the urging spring 52, and the weight body 51 is maintained in the normal position by the axial spring force of contraction of the coil portion 52a. I am trying to let In other words, one urging spring 52 is made to have two functions, that is, the function of maintaining the weight and the function of shifting the link lever 30 to the locked state. Therefore, the number of parts can be reduced, and the size of the device can be further reduced. In addition, a mechanism for moving the weight 51 by impact force (in the embodiment, a mechanism for moving the weight 51 inward of the vehicle) and a mechanism for shifting the link lever 30 from the unlocked state to the locked state (implemented (mechanism for shifting to the front side of the vehicle) is independent, so there is also an advantage that the work for adjusting each is easy.

Here, as is clear from the drawing, when the link lever 30 is shifted to the locked state by the spring force of the urging spring 52 in the unlocked state, the lock lever 22 does not rotate and the unlock spring 24 does not rotate. The sub-lock lever 23 simply rotates with respect to the lock lever 22 against the spring force. Further, the weight body 51 moved outward by the impact force is immediately returned to the normal position by the spring force of the urging spring 52 . Therefore, if the outside door handle or the inside door handle is operated to open after an impact force is applied to the vehicle body, the link lever 30 moves upward while being locked, as shown in FIG. 10(b). As a result, the engagement return portion 33 comes into contact with the pressing contact portion 52d, and the inner arm portion 52c moves rearward due to the tilting action thereof. The inner arm portion 52c moving rearward is gradually guided outward by contacting the engagement guide surface 50c of the engagement claw 50a. Therefore, when the inner arm portion 52c moves rearward and passes the locking surface 50b, the spring force of the biasing spring 52 causes the inner arm portion 52c to immediately move inward. It returns to the state of contacting the locking surface 50b. As a result, the link lever 30 separated from the pressing contact portion 52d of the urging spring 52 shifts to the unlocked state through the sub-lock lever 23 by the spring force of the unlock spring 24, and the state is maintained. It will be. In other words, according to the door latch device described above, it is possible to prevent the side door from being opened carelessly when an impact force is applied. As a result, the link lever 30 comes into contact with the ratchet lever 14a and the side door can be opened.

In the above-described embodiment, the door latch device mounted on the side door of a four-wheeled vehicle is exemplified, but the present invention is not limited to this, and can be applied to a door latch device for controlling the opening and closing of other doors of other vehicles. can also be applied. In this case, the door latch device does not necessarily need to be arranged on the door, and may be arranged on the vehicle body.

In the above-described embodiment, the link lever 30 is pushed by the biasing spring 52 and the weight 51 is maintained at the normal position. It can also be constructed by a member separate from the member that keeps it in place. It should be noted that the biasing member and the weight biasing member do not necessarily have to be torsion coil springs.

Furthermore, in the above-described embodiment, the engaging claws 50a are provided on the case 50 attached to the housing 1, which is the main body of the apparatus. It is also possible to configure so as to provide an engaging pawl.

Reference Signs List 1 housing 10 latch unit 20 lock unit 30 link lever 33 engagement return portion 50 case 50a engagement claw 50b engagement surface 50c engagement guide surface 51 weight 51a engagement arm portion 52 biasing spring 52a coil portion 52b outer arm Part 52c Inner arm part 52d Press contact part

Claims (6)

When the door is closed with respect to the vehicle body, the door is in a latched state to restrict the movement of the door in the opening direction with respect to the vehicle body. a latch unit that allows movement to
Provided in the device main body in a mode of shifting to an unlocked state and a locked state, in the unlocked state, when the door is operated to open, the latch unit shifts to the unlatch state, and in the locked state, the door opens. A door latch device comprising: a link lever that maintains the latch unit in a latched state even when operated,
a weight movably disposed in the device main body and maintained in a normal position by a biasing force of a weight biasing member;
an urging member that maintains the force-accumulated state in a normal state, but when the force-accumulated state is released, shifts the link lever from the unlocked state to the locked state and urges the link lever to maintain that state; ,
an accumulated force release mechanism that cancels the accumulated force state of the biasing member when the weight body moves against the biasing force of the weight biasing member in a state in which the force is accumulated in the biasing member. A door latch device characterized by: The link lever is arranged rotatably and slidably with respect to the apparatus main body, and switches between an unlocked state and a locked state by rotating, and unlatches the latch unit by sliding in the unlocked state. It is possible to move to the state,
The biasing member is bent in the force-accumulated state, and rotates the link lever toward the locked state when the force-accumulated state is released,
The apparatus main body is provided with an engaging claw that maintains the force-accumulating state of the biasing member,
The accumulated force release mechanism is provided in the weight body, and engages with the biasing member when moving against the biasing force of the weight body biasing member, whereby the engagement state with the engaging claw is maintained. 2. The door latch device according to claim 1, further comprising an engaging arm portion for releasing the. The link lever has an engaging guide surface that, when slid in the locked state, bends the biasing member disengaged from the engaging claw and moves it to engage with the engaging claw. have
3. The door latch device according to claim 2, wherein a spring force of an unlock spring that biases the link lever toward the unlocked state acts on the link lever. The biasing member is engaged with the engaging pawl via one of the arm portions, and is twisted to press the link lever via the arm portion when the engagement state with the engaging pawl is released. is a coil spring,
The device main body is provided with an engaging return portion that guides the arm portion to engage with the engaging claw when the biasing member is bent by the link lever. The door latch device according to claim 3. 2. A door latch device according to claim 1, wherein said biasing member also has a function of maintaining said weight in a normal position. The biasing member is a torsion coil spring having a spirally wound coil portion and two arms extending radially from both ends of the coil portion. 6. The method according to claim 5, wherein the weight body is maintained at the normal position by a spring force, and the link lever is rotated toward the locked state by a torsional spring force via the two arm portions. door latch device.

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