JP5553780B2 - Self-propelled mechanism of movable body - Google Patents

Description

  The present invention relates to a self-propelled mechanism for a movable body that causes a movable body that has been moved forward to a self-running start position to move to a forward movement end position.

When the sliding door is suddenly closed, there is a problem that the sliding door impacts against the door and makes a loud collision sound.
Therefore, in Patent Document 1, after the striker is captured by the catcher included in the latch device at the self-running start position of the sliding door (movable body), the catcher is pulled by the pulling coil spring to stop the sliding door (forward movement end position). ) A self-propelled mechanism of a movable body that moves forward is proposed. In Patent Document 1, resistance by a damper is applied to the movement of the catcher, a braking force is applied to the sliding door (movable body), and the sliding door is slowly moved from the position where the braking force is applied to the closed position. .

Specifically, as shown in FIG. 10 of Patent Document 1, the catcher includes a catcher base, a slider that can advance and retreat, a compression coil spring that urges the slider in the advance direction, and a catcher base. It is supported rotatably and is composed of a pair of holding pieces.
When the slider advances, the pair of holding pieces are rotated outward by the slider by pressing the connecting protrusions in the vicinity of the base end portions of the pair of holding pieces on the shoulder portions of the slider. Thereby, the lock part of a pair of holding pieces engages with the to-be-locked part provided in the base part, and the catcher is held at the reference position.

  Further, when the striker presses the head of the slider and retracts the slider against the urging force of the compression coil spring, the striker moves backward and the pair of jaw portions of the slider causes the base end portions of the pair of holding pieces. A nearby linkage protrusion is pushed. As a result, the pair of holding pieces are rotated inward, the engagement between the lock part and the locked part is released, and the tension coil spring moves the sliding door to the stop position (forward movement end position).

JP 2009-257003 A

However, in Patent Document 1, although the sound of the sliding door colliding with the door stop is reduced, there is a problem that an impact sound is generated as an internal operation sound particularly in the case of backward movement.
The inventor of the present application considered in Patent Document 1 that the cause of internal impact sound is as follows. The angle formed by the normal line of the contact surface between the linking protrusion of each holding piece and the corresponding shoulder of the slider with respect to the advancing / retreating direction of the slider is approximately 25 degrees.

When the movable body returned from the stop position reaches the self-running start position, the slider biased by the compression coil spring advances to the advance position, and the pair of holding pieces are rotated outward, While holding the striker is released, the lock portions of the pair of holding pieces engage with the locked portions provided on the base portion.
In this engagement, when the pair of holding pieces receive an impact reaction force in the direction of turning inward, the impact reaction force is converted into a force for moving the slider against the compression coil spring. For this reason, the slider and the pair of holding pieces cause a minute jump and the like, and the impact vibration generated in the slider and the pair of holding pieces is easily sustained, which is considered to be an harsh impact sound inside. .

Further, a compression coil spring having a high biasing force must be used so that the engagement between the lock portion and the locked portion is not released due to an impact. This also causes the engagement sound to be increased by the lock portion and the locked portion.
This invention is made | formed in view of the said subject, The objective of this invention is providing the self-propelled mechanism of the movable body which can reduce an internal impact sound remarkably.

In order to achieve the above object, the invention according to claim 1 is a movable body self-propelled mechanism (A) in which the movable body (1) that has been moved forward to the self-running start position is self-propelled to the forward movement end position. A trigger (3) provided on any one of the movable body and the fixed body (2) that supports the movable body so as to be able to reciprocate, and a latch device (4) provided on the other. A base (5) held on the other side, a catcher (6) that is supported by the base so as to be movable along the moving direction of the movable body, and that captures the trigger at the reference position, and when the catcher is at the reference position A tension spring (7) for storing the biasing force to bias the catcher to the stop position, and a damper (8) for imparting resistance to the movement of the catcher, the catcher extending along the moving direction of the movable body to the base Movably supported And a pair of holdings capable of catching the trigger by turning inwardly and supported by the catcher body (9) to which the tension spring is connected and the catcher body so as to be rotatable around the support shaft (10). An arm (11, 12), a slider (13) slidably supported by the catcher body in the advanced position and the retracted position, and a lock spring (between the catcher body and the slider) for biasing the slider to the advanced position ( 14), and the slider includes a pressed portion (18) that can be pressed by a trigger, and a pair of first cam surfaces (19, 20), and the pair of holding arms includes the pair of holding arms. A pair of first cam follower surfaces (21, 22) that can be respectively engaged with the cam surfaces, and when the movable body is moved back from the forward movement end position to the self-running start position, Along with the displacement of the idler to the advanced position, the pair of first cam surfaces pushes and expands the corresponding first cam follower surface of the pair of holding arms, so that the pair of holding arms are rotated outwardly. The first engaging portion of each holding arm engages with a corresponding stopper portion (25, 26) provided on the base, the catcher is held at the reference position, and the movable body is moved forward to the self-running start position. As the trigger presses the pressed portion of the slider and displaces the slider to the retracted position against the lock spring, the pair of first cam surfaces and the corresponding first cam follower surfaces are disengaged. Thus, inward rotation of the pair of holding arms is allowed, and in this state, the urging force of the tension spring corresponds to the second cam surface (25a, 26a) provided in each stopper portion, respectively. The second holding arm Due to the action of the follower surfaces (27, 28), the pair of holding arms is converted into a force that is turned inward, and the pair of holding arms is turned inward. As a result, the first engagement of each holding arm is performed. The force that causes the pair of holding arms to rotate inward when the engagement between the mating portion and the corresponding stopper portion is released, the catcher is moved to the stop position side by the tension spring, and the catcher is at the reference position. The slider is configured not to be retracted to the retracted position against the urging force of the lock spring, and when the catcher is at the reference position, the first cam surface corresponding to each first cam surface of the slider at the advanced position is provided. The angle that the normal to the cam follower surface makes with respect to the slider's forward / backward direction is the force that causes the pair of holding arms to rotate inward, and the slider moves back to the retracted position against the biasing force of the lock spring. No way, to provide a self-propelled mechanism of the movable body, characterized in that in the range of 85 degrees to 95 degrees.

Also, as in claim 2, said pair of holding arms, the first holding portion capable of holding a trigger presses the pressed portion of the slider (29), than the first holding portion is disposed distally The second holding portion (30) is partitioned, and a pair of inclined third cam surfaces (31, 32) are provided at the tips of the pair of holding arms, and the stop position is reached without capturing the trigger. In the catcher arranged at, the trigger may be captured by the second holding portion when the trigger expands the third cam surface of the pair of holding arms rotated inward.

  In the above description, the alphanumeric characters in parentheses represent reference numerals of corresponding components in the embodiments described later, but the scope of the claims is not limited by these reference numerals.

  According to the invention of claim 1, when the movable body moved backward from the forward movement end position reaches the self-running start position, the slider urged by the lock spring advances to the advance position, and the pair of holding arms The trigger is held by the pair of holding arms by being pivoted outward, and the first engaging portions of the pair of holding arms are engaged with the stopper portions of the base. Even if the pair of holding arms receive the impact reaction force accompanying this engagement, the force that pivots the pair of holding arms inward does not move the slider back to the retracted position against the biasing force of the lock spring. . Therefore, a minute dance or the like hardly occurs in the pair of holding arms and the slider due to the impact reaction force, and the annoying internal impact sound can be significantly reduced.

Further, when the catcher is at the reference position, the angle formed by the normal line between each first cam surface of the slider at the advanced position and the corresponding first cam follower surface with respect to the advancing / retreating direction of the slider has a predetermined magnitude. For example, if a right angle is set at a substantial level, the force that rotates the pair of holding arms inward by the impact reaction force does not cause the slider to move back to the retracted position against the biasing force of the lock spring. .

That is , if the angle is in the range of 85 to 95 degrees, the force that causes the pair of holding arms to rotate inward by the impact reaction force moves the slider back to the retracted position against the biasing force of the lock spring. This can be surely prevented. Therefore, it is possible to further reduce the harsh internal impact sound.
According to the second aspect of the present invention, when the catcher that failed to hold the trigger has been disposed at the stop position, the catcher can be automatically returned to the reference position. That is, in the catcher arranged at the stop position in a state where the trigger is not captured, the trigger is captured by the second holding unit by expanding the third cam surface of the pair of holding arms in the inwardly rotated state. Therefore, the movable body can be moved back to the self-running start position as it is.

It is a schematic perspective view of the sliding door structure to which the self-propelled mechanism of the movable object of one embodiment of the present invention was applied. It is a top view of the latch apparatus of a self-propelled mechanism. It is a partial cross section side view of a latch apparatus. It is a front view of a latch device. (A) is an enlarged plan view of the principal part of a latch device, (b) is a further enlarged view of (a). (A)-(d) is a schematic sectional drawing which shows the forward movement process of the movable body at the normal time sequentially. (A)-(c) is a schematic sectional drawing which shows the return movement process of the movable body at the normal time sequentially. (A)-(d) is a schematic sectional drawing which shows sequentially the process of the first half of the process of returning automatically when the catcher which failed to capture the trigger is at the stop position, and triggers on the catcher at the forward movement end position. The steps of capturing the are sequentially shown. (A)-(c) is a schematic sectional drawing which shows sequentially the latter half of the process of returning automatically when the catcher which failed to capture the trigger is in the stop position, and captures the trigger at the forward end position. The steps for moving the catcher back to the reference position are sequentially shown.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic perspective view of a sliding door structure to which a movable body self-propelled mechanism A according to an embodiment of the present invention is applied. As shown in FIG. 1, in the self-propelled mechanism A, a movable body 1 that is, for example, a sliding door is supported by a fixed body 2 that is, for example, a door frame so as to be able to reciprocate. The sliding door as the movable body may be a top hanging sliding door.

  The self-propelled mechanism A includes a rod-like trigger 3 provided on the fixed body 2 and a rack device 4 provided on the movable body 1. Specifically, the trigger 3 is provided in a groove 2 c that is formed on the upper frame 2 b of the fixed body 2 and that fits in the upper end of the movable body 1. When the movable body 1 is closed, the trigger 3 is disposed at a position spaced from the door stop 2a with respect to the front end 1a in the moving direction, and protrudes downward from the groove bottom of the groove 2c. It is configured to form a rod shape that is fixed to the bottom of the groove.

In the present embodiment, the trigger 3 is fixed to the fixed body 2 and the latch device 4 is held so as to be movable along with the movable body 1. However, the present invention is not limited to this, and the trigger is attached to the movable body. It may be held so as to be able to move together, and the latch device may be fixed to a fixed body.
When the self-propelled mechanism A is operated to move in the direction in which the movable body 1 is closed, the self-propelled mechanism A causes the movable body 1 to self-propell from the midway (self-propelled start position) to the closed position (forward movement end position) that hits the door stop 2a. Is supposed to function.

  As shown in FIGS. 2 and 3, the latch device 4 includes a base 5 held in an installation space (not shown) of the fixed body 2, and a catcher that is movably supported by the base 5 and can capture the trigger 3. 6, a tension spring 7 formed of a tension coil spring that urges the catcher 6 to a stop position (see FIG. 6D) with respect to the base 5, and a hydraulic damper 8 that provides resistance to the movement of the catcher 6, for example. I have.

  As shown in FIGS. 2 and 3, the catcher 6 is supported by the catcher body 9 movably supported in the base 5, and supported by the catcher body 9 so as to be rotatable around the support shaft 10. Thus, a pair of holding arms 11 and 12 that can capture the trigger 3, a slider 13 that is slidably supported by the catcher body 9 between the advanced position and the retracted position, and the catcher body 9 and the slider 13 are interposed. And a lock spring 14 formed of a compression coil spring that urges the slider 13 to the advanced position.

  The base 5 includes a bottom wall 51, a pair of side walls 52 and 53, and a pair of top walls 54 and 55 extending from the pair of side walls 52 and 53. The relationship between the bottom wall 51 and the top walls 54 and 55 may be upside down. In the first half of the base 5, openings are formed to extend over the top walls 54, 55, and a pair of edges of the openings guides a pair of parallel guided surfaces 13 a of the slider 13. A pair of parallel guide surfaces 5a and 5b are provided.

As shown in FIG. 3, the movement of the catcher body 9 in the base 5 is provided on the guide surface 5 c provided on the inner surface of the bottom wall 51 of the base 5 and the inner side surfaces of the side walls 52 and 53 of the base 5. Guided by the guide surfaces 5d and 5e.
The movement of the slider 13 is guided by the guide surface 9a formed on the catcher body 9 and the guide surfaces 5a and 5b provided at the edges of the openings of the top walls 54 and 55 of the base 5. .

  One end 7 a of the tension spring 7 is locked to the base 5, and an end (not shown) connected to the other end 7 b is connected to the adjustment screw 15 so as to be able to move in the axial direction. As shown in FIG. 4, the head of the adjustment screw 15 is exposed at the end of the base 4, and the adjustment screw 15 is screwed into a screw hole (not shown) of the base 5. The urging force of the tension spring 7 can be adjusted by rotating the adjusting screw 15.

Referring to FIG. 3, the damper 8 includes a cylinder 16 fixed to the base 5 and a rod 17 that advances and retreats from the cylinder 16. The tip 17 a of the rod 17 is locked to the catcher body 9. Accordingly, the tension spring 7 and the rod 17 are expanded and contracted with the movement of the catcher 6.
As shown in FIG. 5A, the slider 13 includes a pressed portion 18 that can be pressed by the trigger 3 and a pair of outward first cam surfaces 19 and 20. On the other hand, the pair of holding arms 11 and 12 include a pair of first cam follower surfaces 21 and 22 that can engage with the pair of first cam surfaces 19 and 20 of the slider 13, respectively.

  Between the pair of holding arms 11 and 12, a first holding portion 29 (see also FIGS. 6C and 6D) capable of holding the trigger 3 that presses the pressed portion 18 of the slider 13, and a first holding A second holding part 30 disposed on the tip side of the part 29 is partitioned. The first holding part 29 and the second holding part 30 form a bowl-shaped space. A pair of inclined third cam surfaces 31 and 32 are provided at the tips of the pair of holding arms 11 and 12.

As shown in FIG. 5B, the present embodiment is characterized by a force F (slider) that rotates the pair of holding arms 11 and 12 inwardly when the catcher 6 is at the reference position. 13 corresponds to a clamping force for clamping 13 from both sides), and the slider 13 is configured not to retreat to the retreat position (retreat direction X2 side) against the urging force G of the lock spring 14.
Specifically, the normal lines L1 and L2 between the first cam surfaces 19 and 20 of the slider 13 at the advanced position and the corresponding first cam follower surfaces 21 and 22 are in the forward and backward directions Y1 and Y2 of the slider 13. The angles θ1 and θ2 formed are the force F (corresponding to the clamping force that sandwiches the slider 13 from both sides) that rotates the pair of holding arms 11 and 12 inward, and the slider 13 resists the biasing force G of the lock spring 14. Is set to a size that does not retract to the retracted position.

The angles θ1 and θ2 are set in the range of 85 degrees to 95 degrees. The angles θ1 and θ2 may be 90 degrees.
Next, FIGS. 6A to 6D show the forward movement process of the movable body 1 at the normal time. As shown in FIGS. 6 (a) to 6 (c), as shown in FIGS. 6 (b) and 6 (c), the trigger 3 that has entered the latch device 4 moved along with the movable body 1 in the forward movement direction X1. As the pressed portion 18 of the slider 13 is pressed to displace the slider 13 to the retracted position against the lock spring 14, the first cam follower surfaces 21, 22 corresponding to the pair of first cam surfaces 19, 20 are arranged. The engagement is released and the pair of holding arms 11 and 12 are allowed to turn inward.

  In this state where the pair of holding arms 11 and 12 are allowed to rotate inward, the urging force of the tension spring 7 is applied to the second cam surfaces 25a and 26b [ The pair of holding arms 11 and 12 rotate inwardly by the action of the second cam follower surfaces 27 and 28 of the first engaging portions 23 and 24 of the holding arms 11 and 12 corresponding to FIG. 5B, respectively. As shown in FIG. 6C, the pair of holding arms 11 and 12 are turned inward by being converted into the force to be moved.

Thereby, the trigger 3 is captured between the pair of holding arms 11 and 12, and the engagement between the first engaging portions 23 and 24 of the holding arms 11 and 12 and the corresponding stopper portions 25 and 26 is released. Then, as shown in FIG. 6D, the catcher 6 is driven to the stop position by the tension spring 7.
Next, FIGS. 7A to 7C show the backward movement process of the movable body 1 at the normal time. From the state where the movable body 1 is in the forward movement end position as shown in FIG. 7 (a), the movable body 1 is moved in the backward movement direction X2 while extending the tension spring 1 as shown in FIG. 7 (b). As a result, the catcher 6 moves along with the movable body 1. Then, as shown in FIG. 7C, when the movable body 1 moves backward to the self-running start position, the pair of first cam surfaces 19 are accompanied by the displacement of the slider 13 to the advanced position by the bias of the lock spring 14. , 20 pushes the corresponding first cam follower surfaces 21, 22 of the pair of holding arms 11, 12 to rotate the pair of holding arms 11, 12 outward. As a result, the first holding part 29 Is released from the trigger 3, and the first engaging portions 23, 24 of the holding arms 11, 12 are engaged with the corresponding stopper portions 25, 26 provided on the base 5. It is held at the reference position.

  Next, FIGS. 8A to 8D and FIGS. 9A to 9C show an automatic return process. That is, as shown in FIG. 8 (a), in the catcher 6 arranged at the forward movement end position in a state where the trigger 3 fails to be captured and the trigger 3 is not captured, the pair of holding arms 11 and 12 are directed inward. It is in a rotated state. In this case, the catcher 6 can be automatically returned to the reference position while the trigger 3 is captured.

When the movable body 1 is moved forward from the forward movement end position shown in FIG. 8A, the trigger 3 is moved to the third cam surfaces 31, 12 of the pair of holding arms 11, 12 as shown in FIG. The trigger 3 is captured by the second holding part 30 on the front side, as shown in FIG. 8 (d), by abutting 32 and expanding it as shown in FIG. 8 (c).
Thereafter, as shown in FIGS. 9A and 9B, the movable body 1 is moved backward toward the self-running start position, and as shown in FIG. 9C, the movable body 1 is moved to the free-running start position. When reaching, the trigger 3 separates from the second holding part 30 forward while pushing and expanding the pair of holding arms 11 and 12. Further, the pair of holding arms 11 and 12 are rotated outward, and the first engaging portions 23 and 24 of the holding arms 11 and 12 are engaged with corresponding stopper portions 25 and 26 provided on the base 5. Thus, the catcher 6 is held at the reference position. Thereby, automatic return is easily achieved.

  According to the present embodiment, when the movable body 1 moved backward from the forward movement end position reaches the self-running start position, the slider 13 urged by, for example, the lock spring 14 which is a compression coil spring is moved to the advanced position. The pair of holding arms 11 and 12 are rotated outwardly to release the holding of the trigger 13 by the pair of holding arms 11 and 12, and the first engaging portions of the pair of holding arms 11 and 12 are moved forward. 23 and 24 engage with the stopper portions 25 and 26 of the base 5.

  Even if the pair of holding arms 11 and 12 receive the impact reaction force accompanying this engagement, the force F that causes the pair of holding arms 11 and 12 to turn inward (the holding force for holding the slider 13 from both sides) The slider 13 is not retracted to the retracted position against the biasing force G of the lock spring 14. Therefore, a minute dance or the like hardly occurs in the pair of holding arms 11 and 12 and the slider 13 due to the impact reaction force, and it is possible to significantly reduce the annoying internal impact sound.

  Specifically, when the catcher 6 is at the reference position, the normal lines L1 and L2 between the first cam followers 21 and 22 corresponding to the first cam faces 19 and 20 of the slider 13 at the advanced position are the sliders. A force F that rotates the pair of holding arms 11 and 12 inward by the impact reaction force at angles θ1 and θ2 formed with respect to the forward and backward directions Y1 and Y2 of the slider 13 against the urging force of the lock spring 14. 13 is set to a size (for example, substantially right angle) that is not retracted to the retracted position.

  More specifically, if the angles θ1 and θ2 are in the range of 85 ° to 95 °, the force F that causes the pair of holding arms 11 and 12 to turn inward by the impact reaction force (the slider 13 is clamped from both sides). Can be reliably prevented from retreating the slider 13 to the retreat position against the biasing force G of the lock spring 14. Therefore, it is possible to further reduce the harsh internal impact sound.

  Further, when the catcher 6 that failed to hold the trigger 3 has been placed at the stop position, the catcher 6 can be automatically returned to the reference position. That is, in the catcher 6 arranged at the stop position without capturing the trigger 3, the trigger 3 expands the third cam surfaces 31 and 32 of the pair of holding arms 11 and 12 in an inwardly rotated state. Since the trigger 3 is captured by the second holding part 30 on the front side, the movable body 1 can be moved back to the self-running start position as it is.

  The present invention is not limited to the above embodiment, and the trigger may be held by the movable body so as to be able to move together, and the latch device may be fixed to the fixed body. In addition, various modifications can be made within the scope of the claims of the present invention.

DESCRIPTION OF SYMBOLS 1 Movable body 1a Front end 2 Fixed body 2a Door contact 2b Upper frame 2c Groove 3 Trigger 4 Latch device 5 Base 6 Catcher 7 Tension spring 8 Damper 9 Catcher main body 10 Spindles 11 and 12 Holding arm 13 Slider,
14 Lock spring 15 Adjustment screw 16 Cylinder 17 Rod 18 Pressed portion 19, 20 First cam surface 21, 22 First cam follower surface 23, 24 First engagement portion 25, 26 Stopper portion 25a, 26a Second cam surface 27, 28 Second cam follower surface 29 First holding portion 30 Second holding portion 31, 32 Third cam surface F Force G for turning the pair of holding arms inward L1, L2 normal force θ1, θ2 normal line Angle made by the slider with respect to the forward / backward direction

Claims (2)

In the self-propelled mechanism of the movable body that makes the movable body that has been moved forward to the self-propelled start position self-propelled to the forward end position,
A trigger provided on one of the movable body and the fixed body that supports the movable body so as to be able to reciprocate, and a latch device provided on the other,
The latch device includes a base held on the other side, a catcher supported by the base so as to be movable along the moving direction of the movable body, and a catcher that captures a trigger at a reference position, and an urging force when the catcher is at the reference position. A tension spring that stores the pressure and biases the catcher to the stop position, and a damper that provides resistance to the movement of the catcher,
The catcher is supported by the base so as to be movable along the moving direction of the movable body, and is supported by the catcher main body to which the tension spring is coupled and the catcher main body so as to be able to rotate around the support shaft. A pair of holding arms that can capture the trigger by moving, a slider supported by the catcher body so as to be slidable to the advanced position and the retracted position, and the catcher body and the slider are interposed, and the slider is attached to the advanced position. A locking spring,
The slider includes a pressed portion that can be pressed by a trigger and a pair of first cam surfaces, and the pair of holding arms includes a pair of first cam follower surfaces that can be engaged with the pair of cam surfaces, respectively. Including
When the movable body is moved back from the forward movement end position to the self-running start position, the pair of first cam surfaces move to the corresponding first cam follower surface of the pair of holding arms as the slider moves to the advance position. As a result of the expansion, the pair of holding arms are rotated outward. As a result, the first engaging portion of each holding arm is engaged with the corresponding stopper portion provided on the base, and the catcher is moved to the reference position. Held in
When the movable body is moved forward to the self-running start position, the trigger presses the pressed portion of the slider and displaces the slider to the retracted position against the lock spring, and the pair of first cam surfaces and The corresponding first cam follower surface is disengaged, and the pair of holding arms are allowed to turn inward. In this state, the biasing force of the tension spring is provided in each stopper portion. By the action of the second cam follower surface of the holding arm corresponding to each of the two cam surfaces, the pair of holding arms is converted into a force that is turned inward, and the pair of holding arms is turned inward. The engagement between the first engaging portion of each holding arm and the corresponding stopper portion is released, and the catcher is moved to the stop position side by the tension spring,
When the catcher is in the reference position, the slider is configured not to be retracted to the retracted position against the urging force of the lock spring by the force that rotates the pair of holding arms inwardly .
When the catcher is at the reference position, the angle formed by the normal line between each first cam surface of the slider at the advanced position and the corresponding first cam follower surface with respect to the advancing / retreating direction of the slider is determined by the pair of holding arms. A movable self-propelled mechanism in a range of 85 to 95 degrees so that the slider is not retracted to the retracted position against the biasing force of the lock spring by the inwardly rotating force . Oite to claim 1, said pair of holding arms, a first holding portion capable of holding a trigger presses the pressed portion of the slider, and a second holding portion disposed on the distal side of the first holding portion , And
A pair of inclined third cam surfaces are provided at the tips of the pair of holding arms,
In the catcher arranged at the stop position in a state where the trigger is not captured, the trigger is captured by the second holding unit by expanding the third cam surface of the pair of holding arms in the inwardly rotated state. A self-propelled mechanism for a movable body, characterized in that

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