JP4420787B2 - Seat retracting device for vehicle seat - Google Patents

Description

  The present invention relates to a seat retracting device for a vehicle seat that releases the seat lock of the vehicle seat and retracts the seat when a frontal collision of the vehicle occurs.

  Conventionally, as a seat retracting device for a vehicle seat, an upper rail fixed to a seat cushion is attached to the lower rail so as to be movable in the front-rear direction so as to face a lower rail that extends in the traveling direction of the vehicle on the floor. An elastic body that urges the upper rail in the forward direction is provided, and a plurality of locked portions are provided on the upper rail or the lower rail, and the upper rail is configured to be selectively lockable to the locked portion. There has been known an apparatus including a locking tool that allows the actuator to move back against the movement and prevents it from moving forward due to the elastic force of an elastic body (see, for example, Patent Document 1). In this device, when the vehicle collides with the front and the front of the vehicle enters the vehicle interior, when a rearward load of a predetermined value or more acts on the seat cushion, the upper rail moves backward against the elastic force of the elastic body, and the cushion As the frame moves rearward together with the seat cushion and the seat back, the driver can easily escape from the vehicle that has collided.

However, in the above conventional seat retracting device for a vehicle seat, a rearward load of a predetermined value or more is applied to the seat cushion even when another vehicle collides with the vehicle from the rear, and the cushion frame moves rearward together with the seat cushion and the seat back. There was a bug that moved to.
In order to solve this problem, a sheet retracting device as shown in FIG. 8 is considered. That is, the housing 3 is provided on the vehicle seat, and the rod-like members 4a and 4a whose front ends are opposed to the pair of locked portions 2 and 2 disposed on the floor so as to extend in the traveling direction of the vehicle. The base end is provided so as to be immersible from both side portions, and the rod-like members 4a and 4a are latched to the latched portions 2 and 2 in a state where the rod-like members 4a and 4a protrude from the housing 3 in the vehicle width direction, thereby prohibiting the movement of the seat. Locking bodies 4b and 4b that allow the movement of the sheet by separating the base ends of the members 4a and 4a from the locked portions 2 and 2 while being immersed in the housing 3 are provided at the distal ends of the rod-shaped members 4a and 4a. It is considered that the coil springs 4c and 4c that urge the rod-like members 4a and 4a to protrude from the rod-like members 4a and 4a. Further, in this vehicle seat retraction device, the sliding piece 5 is movably accommodated in the housing 3, and the pair of rod-like members 4a at the first position 6 indicated by the solid line between the base ends of the pair of rod-like members 4a, 4a. , 4a is prohibited, and the pair of rod members 4a, 4a is allowed to be immersed at a second position 7 indicated by a broken line away from the base ends of the pair of rod members 4a, 4a. The sliding piece 5 is configured to move from the first position 6 to the second position 7 when the vehicle collides with the front.

Therefore, in this seat retraction device, when the vehicle collides front, the sliding piece 5 moves from the first position 6 to the second position 7, so that when another vehicle collides with the vehicle from behind, the sliding piece 5 5 is maintained at the first position 6 to prohibit the immersion of the pair of rod-like members 4a and 4a. As a result, when another vehicle collides with the vehicle from the rear, it is possible to prevent the locking main bodies 4b and 4b from moving away from the locked portions 2 and 2 and the seat 2 to move backward. It has become. Here, the coil spring 4c in the seat retracting device shown in FIG. 8 is compressed by being abutted against the sheet side members 4d and 4d fitted into the rod-like members 4a and 4a and fixed at one end to the sheet, and the other end of the rod-like member 4a, The rod-shaped members 4a and 4a are urged so as to protrude by engaging with the bulging portions 4e and 4e formed by bulging in the radial direction 4a.
JP-A-10-250435

  However, in the coil spring 4c in the seat retracting device shown in FIG. 8, when the seat is actually assembled, the coil springs 4c and 4c are compressed and the locking main bodies provided at the tips of the rod-like members 4a and 4a, respectively. 4b and 4b are narrower than the pair of locked portions 2 and 2, and the seats are assembled so that the respective locking bodies 4b and 4b face the pair of locked portions 2 and 2 in that state. It is necessary to restore the coil springs 4c and 4c to protrude the rod-like members 4a and 4a so that the locking bodies 4b and 4b are locked to the pair of locked portions 2 and 2, respectively. The problem to be solved still remains that it is relatively difficult to assemble the sheet in a compressed state.

Moreover, in order to form the bulging parts 4e and 4e which the other end of the coil spring 4c latches into the rod-shaped members 4a and 4a as one body, the rod-shaped members 4a and 4a cut a metal bulk material. Therefore, there is a problem that the unit price of the rod-like members 4a and 4a is pushed up. Further, when the bulging portions 4e and 4e are formed integrally with the rod-like members 4a and 4a, the positions of the bulging portions 4e and 4e are fixed and the other ends of the coil springs 4c and 4c are locked. The width cannot be adjusted, and it is difficult to change and adjust the impact force when the seat is retracted by adjusting the compression width of the coil springs 4c and 4c.
An object of the present invention is to provide a seat retracting device for a vehicle seat that can be assembled relatively easily.
Another object of the present invention is to provide a seat retracting device for a vehicle seat that is relatively inexpensive and can easily adjust the impact force when the seat retracts.

As shown in FIGS. 1 and 7, the invention according to claim 1 is a pair of lower rails 16a and 16b provided on the floor 11a of the cab 11 so as to extend in the vehicle front-rear direction with a predetermined interval in the vehicle width direction. Between the pair of lower rails 16a and 16b, the vehicle seat 13 movably provided in the front-rear direction, the engaged members 31 and 31 provided on the mutually opposed inner portions of the pair of lower rails 16a and 16b, and the pair of lower rails 16a and 16b. A housing 32 provided on the seat 13, a rod-like member 34, 34 whose base end is immersible in the housing 32 from the vehicle width direction and the tip faces the locked members 31, 31, and the tips of the rod-like members 34, 34 The bar-shaped members 34, 34 are provided on the locking member 31, 31 in a state in which the bar-shaped members 34, 34 project outward from the housing 32 in the vehicle width direction, thereby prohibiting the movement of the seat 13, and the base ends of the bar-shaped members 34, 34 The housing 32 is inserted into the locking bodies 33 and 33 which are separated from the locked members 31 and 31 and allow the movement of the sheet 13 to be moved, and the rod-shaped members 34 and 34, and one end abuts against the sheet side member 32. This is a vehicular seat retracting device comprising coil springs 36 and 36 which are compressed and the other ends are locked to the rod-shaped members 34 and 34 and urged so as to project the rod-shaped members 34 and 34 by a restoring force.
As shown in detail in FIG. 1, the characteristic configuration is that male screws 34 a, 34 a are formed around the rod-shaped members 34, 34, and abut against the other ends of the coil springs 36, 36 fitted into the rod-shaped members 33, 33. The first nuts 37, 37 for compressing the coil springs 36, 36 are screwed into the male threads 34a, 34a, and are in contact with the first nuts 37, 37 engaged with the other ends of the compressed coil springs 36, 36. The second nuts 38, 38 for prohibiting the rotation of the first nuts 37, 37 are screwed into the male screws 34a, 34a.

  In the vehicle seat retracting device described in claim 1, when the seat 13 is actually assembled, as shown in FIG. 6, the first nuts 37, 37 screwed into the male screws 34a, 34a and Both of the second nuts 38 and 38 are rotated to move in the axial direction of the rod-shaped members 34 and 34, and the distance between the first nuts 37 and 37 and the seat-side member 32 is widened to increase the base of the rod-shaped members 34 and 34. The end can be immersed in the housing 32. Therefore, in this state, the seat 13 is assembled so that the locking bodies 33, 33 face the pair of locked portions 31, 31, and the first nuts 37, 37 are rotated again to rotate the first nuts 37, 37 and the housing. As shown in FIG. 5, when the coil springs 36 and 36 are compressed, the rod-like members 34 and 34 protrude, and the locking main bodies 33 and 33 provided at the respective ends are connected to a pair of engaged members. The stoppers 31 can be locked. As a result, it is possible to easily assemble the sheet as compared with the conventional case where it is necessary to assemble the sheet with the coil spring compressed.

In the seat retracting device for a vehicle seat according to the first aspect, the first nuts 37 and 37 screwed to the male screws 34a and 34a are rotated to move in the axial direction of the rod-like members 34 and 34. When the distance between the first nuts 37 and 37 and the housing 32 is reduced, the amount of compression of the coil springs 36 and 36 increases, and the urging force for projecting the rod-like members 34 and 34 of the coil springs 36 and 36 increases. Conversely, when the first nuts 37 and 37 are rotated and moved in the axial direction of the rod-shaped members 34 and 34 so as to widen the distance between the first nuts 37 and 37 and the housing 32, the compression amount of the coil springs 36 and 36 is reduced. As a result, the biasing force for projecting the rod-like members 34, 34 of the coil springs 36, 36 also decreases. Accordingly, when the first nuts 37 and 37 are rotated and moved to obtain an appropriate biasing force, the second nuts 38 and 38 are relatively simple operations that prohibit the rotation of the first nuts 37 and 37. It is possible to change and adjust the impact force when the seat is retracted relatively easily.
Further, in the seat retracting device for a vehicle seat according to the first aspect, only the first and second nuts 37 and 38 are screwed together by forming male screws 34a and 34a around the rod-like members 34 and 34. Therefore, it is not necessary to cut the metal bulk material to obtain the rod-shaped members 34, 34 as in the conventional case, and the overall comparison is made by using the relatively inexpensive rod-shaped members 34, 34 by reducing the processing man-hours. It becomes possible to obtain an inexpensive apparatus.

The invention according to claim 2 is the invention according to claim 1, wherein the seat side member is a housing 32.
In the seat retracting device for a vehicle seat according to the second aspect, one end of each of the coil springs 36 and 36 is brought into contact with the housing 32, so that the one end of the coil springs 36 and 36 is independently fixed to the conventional seat. The sheet-side member can be eliminated, and the number of parts can be reduced to obtain a more inexpensive device.

In the seat retracting device for a vehicle seat according to the present invention, a male screw is formed around the rod-like member, and a first nut that contacts the other end of the coil spring fitted in the rod-like member and compresses the coil spring is screwed into the male screw. Since the second nut, which is in contact with the first nut locked to the other end of the compressed coil spring and prohibits the rotation of the first nut, is screwed into the male screw, There is no need to obtain a rod-shaped member by cutting, and a relatively inexpensive device can be obtained as a whole by reducing the number of processing steps and using a relatively inexpensive rod-shaped member.
Further, when the seat is actually assembled, both the first nut and the second nut screwed into the male screw are rotated and moved to widen the gap between the first nut and the seat side member, thereby making the base of the rod-like member. The end can be immersed in the housing. Accordingly, the seat is assembled in this state, and the rod-shaped member protrudes by rotating and moving the first nut again to compress the coil spring, and the locking body provided at each end is locked to the pair of locked portions. Can be made. As a result, it is not necessary to assemble the sheet with the coil spring compressed, and the sheet can be easily assembled.

Further, the urging force for projecting the rod-shaped member of the coil spring can be changed by rotating the first nut screwed to the male screw, and when the appropriate urging force is obtained, the second nut It is possible to change and adjust the impact force when the seat is retracted relatively easily by a relatively simple operation that prohibits the rotation of the first nut.
Further, if the seat side member is a housing, it is possible to eliminate the need for the seat side member that is independently fixed to abut one end of the coil spring, thereby reducing the number of parts and obtaining a more inexpensive device. It becomes possible.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 7, the cab 11 of the cab over type truck 10 is provided with a steering column 12 that rotatably holds the steering shaft. The steering column 12 is supported on the dash panel 10a via a column support bracket 10b, and a steering wheel 12a is fixed to a steering shaft protruding from the upper end of the steering column 12. A vehicle seat 13 is provided on the floor 11 a facing the steering column 12. The seat 13 includes a seat cushion 13a that receives the driver's hip, and a seat back 13c that is attached to the rear end of the seat cushion 13a via a reclining adjuster 13b and receives the driver's back. A cushion frame 13d that supports the seat cushion 13a is provided at the lower portion of the seat cushion 13a (FIG. 1). A pair of lower rails 16a and 16b are disposed on the floor 11a of the cab 11 so as to extend in the traveling direction of the track 10. The pair of upper rails 17a and 16b are disposed on the seat cushion 13a so as to face the pair of lower rails 16a and 16b, respectively. 17b is fixed. The lower rails 16a and 16b are attached to the floor 11a via seat legs 18 and seat brackets 19.

  As shown in FIGS. 1 and 2, the pair of upper rails 17a and 17b has substantially the same length as the pair of lower rails 16a and 16b, and the pair of upper rails 17a and 17b is respectively the pair of lower rails 16a and 16b. It is attached to the outside so as to be movable along its longitudinal direction. Although not shown, a roller accommodating portion is formed between the upper rails 17a and 17b and the lower rails 16a and 16b, and rollers are accommodated in the accommodating portions, respectively. A forward stopper (not shown) and a backward stopper (not shown) for determining the most advanced position and the most retracted position of the upper rails 17a, 17b are provided at the front and rear ends of the roller rolling surfaces of the lower rails 16a, 16b. Each projectes.

  The moving member 14 is attached to the pair of lower rails 16a and 16b so as to be movable in the front-rear direction. The moving member 14 in this embodiment includes a pair of auxiliary rails 14a and 14b attached to the inner sides of the pair of lower rails 16a and 16b along the longitudinal direction thereof, and the pair of auxiliary rails 14a and 14b. And a connecting plate 14c for connecting the two. The pair of auxiliary rails 14a and 14b are formed shorter than the length of the lower rails 16a and 16b, and the moving member 14 including the auxiliary rails 14a and 14b is disposed between the pair of lower rails 16a and 16b and the front ends of the pair of lower rails 16a and 16b. It is mounted so as to be movable in the front-rear direction within a range between the rear end and the rear end. On the other hand, the pair of upper rails 17a and 17b are attached to the pair of lower rails 16a and 16b from the front and rear ends of the pair of upper rails 17a and 17b, respectively, such that the moving member 14 cannot protrude forward or backward. A pair of upper rails 17 a and 17 b is provided with a sheet fixing means 20 that selectively fixes the upper and lower rails 17 a and 17 b to arbitrary positions in the front-rear direction of the moving member 14.

  The seat fixing means 20 in this embodiment includes a plate 21 with a hole provided in the moving member 14 and an adjustment handle 22 attached to the upper rails 17a and 17b along the longitudinal direction of the upper rails 17a and 17b. The plate 21 with holes is provided along the lower rails 16a and 16b on both sides of the moving member 14, and a plurality of square holes 21a are formed along the longitudinal direction of the rails 16a and 16b. Further, the base end of the handle holder 23 is fixed to the upper surfaces of the upper rails 17a and 17b, respectively, and a round hole 23a is formed at the tip of the handle holder 23. The round hole 23a is configured such that the adjustment handle 22 is rotatably inserted and is rotatable about the axis thereof. A base end of a claw member 24 is fixed to the adjustment handle 22, and a tip end of the claw member 24 is bent so as to be selectively inserted into the plurality of square holes 21a. The adjustment handles 22 provided on the upper surfaces of the upper rails 17a and 17b are connected to each other via a connecting member 27 and a connecting wire 28 provided at the rear ends of the upper rails 17a and 17b. The torsion coil springs 26 are wound so as to rotate the adjusting handles 22 in the direction in which the tips of the claw members 24 are inserted into the square holes 21a.

  In the seat fixing means 20, the upper rails 17 a and 17 b are independent of the moving member 14 by rotating the adjustment handle 22 together with the claw member 24 and detaching the tip from the square hole 21 a in the holed plate 21. It will be in the state which can move to the front-back direction along 16b. Then, the adjustment handle 22 is rotated at the optimum position according to the urging force of the coil spring 26, and the front end of the claw member 24 is inserted into the square hole 21a, thereby prohibiting the movement of the seat 13 relative to the moving member 14 in the front-rear direction. Composed.

  As shown in FIGS. 1 to 3, the moving member 14 is moved backward together with the moving member 14 with respect to the pair of lower rails 16 a and 16 b when an impact force of a predetermined value or more acts on the seat 13 from the front. A vehicle seat retraction device 30 is provided. The retracting device 30 in this embodiment is provided on a pair of locked members 31 provided on the inner side of the pair of lower rails 16a and 16b, and on the moving member 14 between the pair of locked members 31. And a housing 32. The locked member 31 is provided along the longitudinal direction on the inner side of the pair of lower rails 16a and 16b. A plurality of locked portions 31a are formed on the locked member 31 at predetermined intervals in the longitudinal direction of the pair of lower rails 16a and 16b (FIG. 3). The locked portion 31a is a serrated recess formed inside the locked member 31, and the front surface 31b of the locked portion 31a is formed as an upright surface extending substantially in the vehicle width direction, and the rear surface 31c. Is formed on an inclined surface that gently climbs toward the rear.

  On the other hand, the housing 32 is provided with base ends of a pair of rod-like members 34 and 34 whose front ends face the locked members 31 and 31 so as to be immersable from both sides in the vehicle width direction. Further, the connecting plate 14c of the moving member 14 is provided with support members 39, 39 for supporting the tip portions of the pair of rod-shaped members 34, 34. The pair of rod-shaped members 34, 34 includes the housing 32 and the support members 39, 39. Thus, the base end extends in the vehicle width direction and is provided so as to be immersed in the housing 32. Locking bodies 33, 33 configured to be locked to the locked portion 31a of the locked member 31 are provided at the distal ends of the pair of rod-shaped members 34, 34, respectively. The locking body 33 is formed with a rear surface 33c inclined so as to come into surface contact with the front surface 31c of the locked portion 31a in a state where the tip of the locking body 31a has entered (FIG. 3). ). In addition, coil springs 36 that urge the pair of rod-shaped members 34, 34 so as to protrude from the housing 32 are fitted into the pair of rod-shaped members 34, 34, respectively. The locking body 33 at the tip of the rod-shaped member 34 biased by the coil spring 36 is configured to be selectively locked to the locked portion 31 a of the locked member 31 by the elastic force of the coil spring 36. The

  Accordingly, when a rearward load is applied to the upper rail 17a, the load is transmitted to the moving member 14, and the pair of locking bodies 33, 33 together with the moving member 14 tends to move backward together with the upper rail 17a. Then, the pair of rod-shaped members 34, 34 are immersed in the housing 32 against the biasing force of the coil spring 36 by the inclined rear surface 31c (FIG. 3) of the locked portion 31a, and the pair of locking main bodies 33, 33 are rearward. When the pair of locking main bodies 33, 33 are opposed to the next locked portion 31 a behind the locked portion 31 a locked until now, the pair of rod-like bodies are biased by the biasing force of the coil spring 36. The members 34 and 34 protrude. And the latching main bodies 33 and 33 provided in those front-end | tips latch to the to-be-latched part 31a. That is, the locked member 31 and the locking body 33 are configured to prevent the upper rails 17a and 17b from moving forward while allowing the upper rails 17a and 17b to move backward.

  Here, the coil springs 36, 36 fitted into the rod-shaped members 34, 34 are pressed against the housing 32, which is the seat side member, and compressed, and the other ends are locked to the rod-shaped members 34, 34. The rod-shaped members 34, 34 are biased so as to protrude by a restoring force. Then, male screws 34a and 34a are formed around the pair of rod-shaped members 34 and 34, respectively, and the other ends of the coil springs 36 and 36 fitted into the rod-shaped members 34 and 34 are in contact with the male screws 34a and 34a. The first nuts 37 and 37 are screwed together. Then, the second nuts 38, 38 that contact the first nuts 37, 37 locked to the other ends of the compressed coil springs 36, 36 and prohibit the rotation of the first nuts 37, 37 are male screws 34a, Further screwed onto 34a.

  As shown in FIGS. 3 and 4, a sliding piece 41 is provided inside the housing 32. The sliding piece 41 is disengaged from the first position 42 indicated by the solid line between the base ends of the pair of rod-shaped members 34, 34 and the base ends of the pair of rod-shaped members 34, 34 in front of the first position 42. A second position 43 indicated by a broken line inside the housing 32 is movably accommodated in the housing 32. Further, the housing 32 accommodates a piece receiving member 44 and is further provided with a maintenance spring 46 that biases the piece receiving member 44. The piece receiving member 44 is accommodated in the housing 32 between the first position 42 and the second position 43, and the piece receiving member 44 is affected by the inertial force of the sliding piece 41 applied when an impact force acts on the sheet 13. The sliding piece 41 is accommodated in the housing 32 so as to be immersed in a direction orthogonal to the moving direction of the sliding piece 41. The maintenance spring 46 extends in the insertion direction of the piece receiving member 44 and is provided in the housing 32. The maintenance spring 46 is urged so as to project the piece receiving member 44 to maintain the sliding piece 41 in the first position 42 or the second position 43. Configured to let Here, reference numeral 47 denotes a cushion spring that alleviates the impact when the sliding piece 41 moves.

  In the vehicle seat retracting device 30 configured as described above, an inertial force accompanying the normal traveling acts on the seat 13 during the normal traveling of the truck 10, but since this inertial force is not an impact load, the maintenance spring The sliding piece 41 is positioned at the first position 42 by the urging force 46. Further, when the vehicle 10 is collided from behind, a shocking and large forward load does not act on the seat 13. Therefore, even when the vehicle 10 is collided from behind, the sliding piece 41 does not move from the first position 42 to the second position 43. Therefore, when the sliding piece 41 is positioned at the first position 42, the pair of rod-shaped members 34, 34 are maintained in a state where they cannot be immersed. As a result, the locking main bodies 33 and 33 are not separated from the locked members 31 and 31, and the backward movement of the seat 13 when the vehicle 10 collides from behind is prohibited.

  On the other hand, when the truck 10 collides frontward, a forward load is applied to the seat 13, and the sliding piece 41 moves from the first position 42 to the second position 43. Thus, although the pair of rod-like members 34 and 34 are allowed to be immersed, the upper rails 17 a and 17 b are prevented from moving forward together with the moving member 14 by the locked member 31 and the locking body 34. Thereafter, when the steering column 12 moves backward and abuts against the seat cushion 13a or an airbag (not shown) is inflated to apply a backward load to the seat 13, the moving member 14 moves rearward together with the seat 13. The pair of rod-like members 34 and 34 are immersed in the housing 32 against the urging force of the coil spring 36 by the inclined rear surface 31c (FIG. 3) of the locked portion 31a. Then, the moving member 14 moves backward along the lower rails 16 a and 16 b together with the seat 13. As a result, the seat 13 can be reliably retracted at the time of a frontal collision of the truck 10, and the occupant's ability to escape the seat 13 can be improved.

Next, the procedure for assembling the seat 13 in the seat retracting device 30 will be described.
As shown in FIG. 6, when the seat 13 is assembled, the first nuts 37 and 37 and the second nut screwed into the male screws 34a and 34a in a state where the sliding piece 41 is located at the second position 43. 38 and 38 are rotated to move in the axial direction of the rod-shaped members 34, 34, and the distance between the first nuts 37, 37 and the housing 32 is increased. In this way, the first nuts 37 and 37 are moved to reduce the biasing force of the coil springs 36 and 36, and the second nuts 38 and 38 are moved and brought into contact with the support members 39 and 39 to thereby move the rod-shaped member 34. , 34 is immersed in the housing 32 so that the interval between the locking bodies 33, 33 provided at the distal ends of the pair of rod members 34, 34 is narrower than the interval between the pair of locked portions 31, 31, respectively. Maintain state. Thereafter, as shown by solid line arrows, the seat 13 is moved and assembled so that the respective locking main bodies 33, 33 face the pair of locked portions 31, 31.

  Next, as shown in FIG. 5, the first nuts 37, 37 are rotated again to narrow the distance between the first nuts 37, 37 and the housing 32, and the coil springs 36, 36 are compressed. When the urging force of the coil springs 36, 36 due to the compression reaches an appropriate value, the rotation of the first nuts 37, 37 is stopped, and then the second nuts 38, 38 are rotated to move the other of the coil springs 36, 36. The first nuts 37 and 37 that are locked to the ends are brought into contact with each other, and the rotation of the first nuts 37 and 37 is prohibited. As a result, the coil springs 36, 36 are projected by the urging force to be restored, so that the rod-like members 34, 34 protrude, and the locking bodies 33, 33 provided at the respective tips are locked to the pair of locked portions 31, 31. Then, the sliding piece 41 is moved from the second position 43 to the first position 42 as shown by a solid arrow using a jig (not shown), and the assembling work of the sheet 13 is finished.

  Here, when compressing the coil springs 36, 36, the first nuts 37, 37 screwed into the male threads 34 a, 34 a are rotated to move in the axial direction of the rod-shaped members 34, 34, thereby If the space | interval of 37 and the housing 32 is narrowed, the compression amount of the coil springs 36 and 36 will increase, and the urging | biasing force which projects the rod-shaped members 34 and 34 of the coil springs 36 and 36 will increase. Conversely, when the first nuts 37 and 37 are rotated and moved in the axial direction of the rod-shaped members 34 and 34 so as to widen the distance between the first nuts 37 and 37 and the housing 32, the compression amount of the coil springs 36 and 36 is reduced. As a result, the biasing force for projecting the rod-like members 34, 34 of the coil springs 36, 36 also decreases. Accordingly, when the first nuts 37 and 37 are rotated and moved to obtain a desired urging force, the second nuts 38 and 38 are relatively simple operations that prohibit the rotation of the first nuts 37 and 37. It is possible to change and adjust the impact force when the seat is retracted relatively easily.

In this embodiment, the cab-over type truck is used as the vehicle. However, a passenger car or other vehicles may be used.
In this embodiment, the upper rail is attached to the lower rail. However, the upper rail may be attached to the moving member so as to be movable in the front-rear direction.
Further, in this embodiment, the driver's seat is used as the seat, but a passenger seat or other seats may be used.

FIG. 3 is a cross-sectional view taken along the line AA in FIG. Perspective view showing the structure of the device BB sectional view of FIG. CC sectional view of FIG. Sectional drawing corresponding to FIG. 3 which shows the state which the sliding piece moved to the 2nd position from the 1st position. Sectional drawing corresponding to FIG. 3 which shows the state in which the rod-shaped member was immersed in the housing. The cross-sectional block diagram of the cab of the track | truck containing the sheet | seat which shows the state before front collision. The block diagram which shows the seat receding apparatus of the conventional vehicle seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Cab 11a Floor 13 Vehicle seat 16a, 16b Lower rail 30 Seat retracting device 31 Locked member 32 Housing 33 Locking body 34 Rod-shaped member 34a Male screw 36 Coil spring 37 First nut 38 Second nut

Claims (2)

For vehicles provided on the floor (11a) of the cab (11) with a predetermined distance in the vehicle width direction and extending in the longitudinal direction of the vehicle so as to be movable in the longitudinal direction on a pair of lower rails (16a, 16b) The seat (13), the engaged members (31, 31) provided on the mutually opposed inner portions of the pair of lower rails (16a, 16b), and the sheet intermediate between the pair of lower rails (16a, 16b) A housing (32) provided in (13), and a rod-like member (34, 34) whose proximal end is provided in the housing (32) so as to be immersible from the vehicle width direction and whose distal end faces the locked member (31, 31). 34) and the locked member (31, 31) provided at the tip of the rod-shaped member (34, 34) and protruding in the vehicle width direction from the housing (32). ) And the movement of the sheet (13) is prohibited, and the base ends of the rod-shaped members (34, 34) are separated from the locked members (31, 31) while being immersed in the housing (32). Move the sheet (13) The locking main body (33, 33) that allows the compression and the rod-like member (34, 34) are inserted into the rod-like member (34, 34) and compressed at one end in contact with the seat-side member (32). A retractor device for a vehicle seat comprising a coil spring (36, 36) for engaging and biasing the rod-like member (34, 34) so as to protrude by a restoring force,
Male threads (34a, 34a) are formed around the rod-shaped members (34, 34),
A first nut (37, 37) that contacts the other end of the coil spring (36, 36) fitted in the rod-shaped member (33, 33) and compresses the coil spring (36, 36) is the male screw ( 34a, 34a)
A second nut that abuts against the first nut (37, 37) that is engaged with the other end of the compressed coil spring (36, 36) and prohibits the rotation of the first nut (37, 37). 38, 38) are screwed into the male screws (34a, 34a). 2. A vehicle seat retreating device according to claim 1, wherein the seat side member is a housing.

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