JP5343587B2 - Structure for assembling the operation cable to the tube case - Google Patents

Description

  The present invention relates to a structure for assembling an operation cable to a cylindrical case, and more particularly to a structure for assembling an operation cable including a cylindrical outer cable and an inner cable that can be inserted through the outer cable to the cylindrical case.

  Conventionally, when a rear collision occurs in a vehicle, there is already known a headrest (so-called active headrest) in which a portion (support plate) for supporting the occupant's rear head instantaneously jumps toward the occupant's rear head side among the headrest of the vehicle seat. It has been. Here, in Patent Document 1 below, a load that strongly pushes against the seat back by an occupant seated in a vehicle seat is transmitted by an operation cable due to the momentum when a rear collision occurs in the vehicle. Has been disclosed. In this way, by causing the support plate to pop out when a rear collision occurs in the vehicle, it is possible to reduce the impact generated on the occupant's rear head and improve safety.

JP 2008-105454 A

  However, in the prior art described above, as shown in FIG. 9, the upper end of the operation cable 150 is inserted from below the support 180 for assembling the stay 134a of the active headrest, and the operation cable 150 itself is further supported in the inserted state. The operation cable 150 is assembled to the support 180 which is a cylindrical case by rotating in the direction around the axis 180 (in the arrow direction in FIG. 9). Thus, the step of inserting the operation cable 150 and the step of rotating the inserted operation cable 150 are required, and it has been required to simplify them.

  The present invention is intended to solve such problems, and an object of the present invention is to easily assemble an operation cable into a cylindrical case.

The present invention is for achieving the above object, and is configured as follows. The invention according to claim 1 is a structure in which an operation cable including a cylindrical outer cable and an inner cable that can be inserted through the outer cable is assembled to the cylinder case, and one end of the outer cable is included in one end of the operation cable. A base member that can be fitted inside the cylindrical case is assembled to the part, and one end of the inner cable is inserted into the base member, and the base cable can be rotated about the axis of the inner cable. The projecting body is assembled to the wall of the projecting body through a biasing member, and a notch is formed in the wall surface of the projecting body along the axial direction of the inner cable. The inner cable is connected to one end of the inner cable. slide body having a substantially T-shaped slidable along the notch when moved relative to the outer cable are assembled, a substantially T-shaped slide member Both the tip is formed towards the opposite directions so as to protrude from the cutout portion of the projecting member, the wall surface of the cylindrical casing, both ends and the base of the slide member protrudes from the cutout portion of the projecting member Guide grooves that can guide both engaging protrusions of the member are formed, and the guide grooves are formed in a straight line portion along the longitudinal direction of the cylindrical case and in the circumferential direction of the cylindrical case from both ends of the straight line portion. It is composed of bent parts that are bent so as to face in opposite directions, and is arranged at one end of the cylindrical case while guiding both ends of the slide body and both engaging protrusions of the base member to the linear part of the guide groove, respectively. When one end of the operation cable is inserted and inserted, the urging force acts on the base member as a base point and the slide body as well as the slide body around the axis of the inner cable due to torsion generated in the urging member. In the activated state When both ends of the id body reach the bent part of the guide groove, the slide body rotates together with the projecting body by the urging force acting on the slide body so that the both ends are respectively guided to the end side of the bent part. By this rotation, both ends of the slide body are held at the end sides of both bent portions, respectively.
According to this configuration, the step of rotating the inserted operation cable is not performed by an artificial work as in the prior art, but by the urging force of the urging member. Therefore, since the step of rotating can be omitted, the operation cable can be easily assembled to the cylinder case. Moreover, according to this structure, the member which can exert the urging | biasing force of an urging member is only a protrusion and the slide body rotated with this protrusion. Therefore, since it can be completed with a biasing member having a small biasing force, one end of the operation cable can be reduced in size. That is, since the urging member can be reduced in size, the base member can also be reduced in size.

The invention according to claim 2 is a structure in which the operation cable according to claim 1 is assembled to a cylindrical case, and includes an active headrest having a stay in which a rod is held, and is provided on a wall surface of the stay. Are formed with receiving grooves capable of guiding both ends of the slide body respectively held at the end sides of both bent portions, and the other ends of the cylindrical case while guiding both ends of the slide body into the both receiving grooves. When the tip of the stay is inserted into the end, the slide body is guided so that both ends thereof are respectively guided to the end sides of both receiving grooves, and both ends of the slide body from the end sides of both bent portions. The slide body is rotated so as to be returned to the straight portions, and both ends of the slide body are held on the end sides of the receiving grooves by the rotation.
Further, according to this configuration, it is possible to connect the one end of the operation cable to the cylinder case only by inserting the stay of the active headrest into the cylinder case in which one end of the operation cable is connected (assembled). Therefore, the operation cable can be easily assembled to the stay.

The invention according to claim 3 is a structure in which the operation cable according to claim 2 is assembled to the cylindrical case, and the amount of insertion of the tip of the stay with respect to the other end of the cylindrical case is adjustable. and said that you are.
Further, according to this configuration, when the base member can be reduced in size as in the operation and effect of the invention described in claim 2 described above, the height position of the active headrest relative to the seat back is set to the lower position (for example, the lowest end) Even when the position is set, it is possible to prevent one end of the operation cable from interfering with the back side of the seat back.

FIG. 1 is an overall schematic view of a vehicle seat to which an assembly structure according to an embodiment of the present invention is applied. FIG. 2 is an exploded perspective view in which the assembly structure that is the main part of FIG. 1 is enlarged. FIG. 3 is an exploded perspective view in which the configuration of one end of the operation cable of FIG. 2 is enlarged. FIG. 4 is a perspective view showing the assembled state of FIG. FIG. 5 is a longitudinal sectional view of FIG. 6 is a perspective view showing a state in the middle of assembly from the disassembled state of FIG. FIG. 7 is a perspective view when FIG. 6 is further assembled. FIG. 8 is a perspective view after the assembly of FIG. 7 is completed. FIG. 9 is an exploded perspective view of a conventional assembly structure.

  Hereinafter, the form for implementing this invention is demonstrated using FIGS. In FIG. 1, in order to show the internal structure of the vehicle seat 1 composed of the seat cushion 10, the seat back 20, and the active headrest 30, these cushion structure and skin structure are omitted, and only the internal frame structure is shown. Is shown. In the following description, the terms “up”, “down”, “front”, “rear”, “left”, and “right” refer to the directions of “up”, “down”, “front”, “rear”, “left”, “right”, The direction of up, down, front, back, left and right is shown.

  First, the overall configuration of the vehicle seat 1 according to the embodiment of the present invention will be described. As shown in FIGS. 1 and 2, the vehicle seat 1 includes a seat cushion 10 on which an occupant is seated, a seat back 20 that serves as a backrest portion of the seated occupant, and an active headrest 30 that supports the rear head of the seated occupant. It is composed of Among these components, the frame structure of the seat back 20 and the frame structure of the active headrest 30 will be described in detail. Since the frame structure of the seat cushion 10 is a known configuration, detailed description thereof will be omitted.

  First, the frame structure of the seat back 20 will be described in detail. The frame of the seat back 20 includes a pair of left and right side frames 22, 22, an upper frame 24 that bridges the upper parts of the side frames 22, and a lower frame 26 that bridges the lower parts of the side frames 22. It is composed of The lower ends of the side frames 22 are assembled to the rear ends of the pair of left and right cushion frames 12 and 12 of the seat cushion 10 via a reclining mechanism (not shown). Thereby, the seat back 20 can be tilted with respect to the seat cushion 10, and the seat back 20 can be held at a desired tilt position within the tilt range.

  A pair of left and right holders 24a and 24a are assembled to the upper frame 24, respectively. Cylindrical supports 80 and 90 capable of inserting and locking a pair of left and right stays 34a and 34b of an active headrest 30, which will be described later, are assembled to both holders 24a. On the inner wall surface of the through-hole 80a of one support 80 (left support in FIG. 1), a plurality of members formed in the longitudinal direction of the surface of one stay (left stay in FIG. 1) 34a to be described later. A locking plate (both not shown) that can be inserted into any of the stop holes is formed.

  Then, by inserting the knob 80b formed on the support 80, the insertion of the locking plate into the locking hole can be released. Thereby, since a locking plate can be inserted into a desired locking hole, the amount of stay 34a inserted into the support 80 can be adjusted. That is, the height position of the active headrest 30 with respect to the seat back 20 can be adjusted.

  As shown in FIG. 2, both ends 54 b of the slide body 54 a protruded from the cutout portion 72 of the protrusion 70 when the protrusion 70 is assembled to the base member 60 described later on the wall surface of the support 80. Each of the guide grooves 82 is formed. The guide groove 82 is formed so that the linear portion 82a formed along the longitudinal direction of the support 80 and the ends of the linear portion 82a (both upper ends in FIG. 2) are opposite to each other in the circumferential direction of the support 80. And a bent portion 82b bent in a substantially reverse J shape. A cover member 82c having a substantially U-shaped cross section is formed on both edges of the straight portion 82a. Thereby, it can prevent that the opening of the edge part by which the guide groove 82 is formed among the opening of the both ends of the support 80 bends in an open state.

  When one end portion (upper end portion in FIG. 2) of the operation cable 50 described later is inserted into one end portion (lower end portion in FIG. 2) of the support 80, the linear portions 82a of both guide grooves 82 Not only both ends 54b of the slide body 54a of the operation cable 50, but also both engagement protrusions 66 of the base member 60 assembled to one end of the operation cable 50 can be fitted.

  The other support 90 (the right support 90 in FIG. 1) is a known one and will not be described in detail. Moreover, these both supports 80 and 90 are each integrally molded by a synthetic resin having rigidity. The active headrest 30 can be assembled to the seat back 20 by using both the supports 80 and 90. This assembly structure will be described in detail later.

  Next, the frame structure of the active headrest 30 will be described in detail. The frame of the active headrest 30 includes a base portion 32 that defines the active headrest 30, a pair of left and right stays 34a and 34b that are assembled integrally with the base portion 32, a tension spring and a link mechanism (both not shown) ), And the support plate 36 assembled through the above.

  Note that the support plate 36 is locked by the lock mechanism R so as to be substantially integrated with the base 32 against the urging force of the tension spring at a normal time before the rear collision occurs in the vehicle. The lock mechanism R is unlocked by pushing up a rod 38 disposed inside one stay 34a (left stay in FIG. 1) by a protrusion 70 described later. When the lock is released, the link mechanism is actuated by the urging force of the tension spring, so that the support plate 36 instantly protrudes forward with respect to the base portion 32. Thereby, the passenger | crew's back head can be received instantaneously by the support plate 36. FIG.

  Also, on the wall surface of the stay 34a, the receiving grooves 34c, 34c are formed in an upward inclined shape capable of guiding the both ends 54b of the slide body 54a when held on the end sides of the bent portions 82b of the both guide grooves 82, respectively. Are formed respectively. The both receiving grooves 34c are arranged so that their upward inclinations are opposite to each other in the circumferential direction of the stay 34a so as to be able to cope with the case where the slide body 54a of the operation cable 50 rotates around the axis of the inner cable 54. Is formed. As described above, a plurality of locking holes (not shown) are drilled on the surface of the stay 34a. In this way, the frame of the active headrest 30 is configured.

  Next, a clutch mechanism C that detects only the backrest load of the occupant when a rear collision occurs in the vehicle including the vehicle seat 1 having the above-described frame configuration, and an operation cable 50 that transmits the detected backrest load. Each configuration will be described individually.

  First, the clutch mechanism C will be described with reference to FIG. The clutch mechanism C is configured in the same manner as the rear collision detection device disclosed in Patent Document 1 described above, and includes a crank-shaped pressure receiving member 40 that receives a backrest load of an occupant, and a shaft end of the pressure receiving member 40. It is comprised from the damper 42 fastened by the part. The damper 42 has a structure in which a viscous fluid is sealed inside, and the operation arm 42a is rotated by the resistance force of the viscous fluid.

  Therefore, when the pressure receiving member 40 receives a backrest load at a rapid speed from the occupant due to the occurrence of a rear collision in the vehicle, the internal viscous resistance acts greatly, so that the operation arm of the damper 42 is caused by the backrest load. 42a can be rotated. On the contrary, when the pressure receiving member 40 receives a backrest load at a moderate speed from the occupant due to the passenger getting on and off, or simply by the backrest of the occupant, the viscous resistance force inside the pressure receiving member 40 acts small, so the damper 42 is caused by the backrest load. The operating arm 42a cannot be rotated. Only the backrest load of the occupant when a rear collision occurs in the vehicle can be detected by the clutch mechanism C configured as described above.

  Next, the operation cable 50 for transmitting the backrest load detected by the clutch mechanism C will be described. In this description, the configuration of the operation cable 50 itself and the connection structure at both ends of the operation cable 50 will be described separately.

  First, the configuration of the operation cable 50 itself will be described with reference to FIGS. The operation cable 50 is a double-structured cable composed of an outer cable 52 formed in a cylindrical shape and a wire-like inner cable 54 inserted so as to be movable inside the outer cable 52. A base member 60 formed in a case shape having a circular concave surface is fixed to one end portion (the upper end portion in FIG. 3) of the outer cable 52.

  One end of the inner cable 54 is inserted through a shaft body 62 that protrudes from the center of the concave surface of the base member 60. A slide body 54 a having a substantially T-shape is assembled to the tip of the inserted inner cable 54. The both ends 54b of the substantially T-shape of the slide body 54a are formed in opposite directions so as to protrude from the notches 72 of the protrusion 70 when the protrusion 70 described later is assembled to the base member 60. ing.

  The base member 60 is assembled with a projecting body 70 that is rotatable about the axis of the inner cable 54. At this time, the protruding body 70 is assembled in such a manner as to sandwich the flange 60 a formed at the edge of the opening in the base member 60. Thereby, it is possible to prevent the protruding body 70 from falling off the base member 60. At this time, the projecting body 70 is assembled through a torsion spring 76 inserted into the outer wall of the shaft body 62 of the base member 60.

  One end 76 a of the torsion spring 76 is latched to a hook portion 64 formed on the shaft body 62. On the other hand, the other end 76 b of the torsion spring 76 is also latched by a hook portion 74 formed on the projecting body 70. As a result, when both the front ends 54b of the slide body 54a and both the engaging projections 66 of the base member 60 are fitted into the straight portions 82a of the both guide grooves 82, the torsion spring 76 is twisted, and the torsion is restored. Due to the force, an urging force can be applied to the projecting body 70 in the clockwise direction in the plan view (the arrow direction in FIG. 2).

  Further, a cutout portion 72 capable of sliding the above-described slide body 54 a is formed on the wall surface of the projecting body 70 along the axial direction of the inner cable 54. Accordingly, when tension is applied to the inner cable 54, the outer cable 52 can be slid relative to the inner cable 54, and as a result, the protruding body 70 can be caused to jump out of the slide body 54a. it can. Thus, the operation cable 50 is configured.

  Next, with reference to FIGS. 6 to 8, a connection structure of one end portion (upper end portion in FIG. 6) of the operation cable 50 configured as described above, that is, a connection structure of the operation cable 50 and the active headrest 30 will be described. To do. First, one end of the operation cable 50 is inserted from below the through hole 80a of the support 80. At this time, both ends 54b of the slide body 54a of the inner cable 54 are guided to both linear portions 82a of the support 80, and both engaging protrusions 66 of the base member 60 are fitted into both linear portions 82a of the support 80, respectively. Insert it. Then, as described above, the urging force acts on the slide body 54a as well as the projecting body 70 in the direction around the axis of the inner cable 54 due to the twist generated in the torsion spring 76.

  Then, when both ends 54b of the slide body 54a reach the bent portions 82b of the guide groove 82 in a state where this urging force is applied (see FIG. 6), both ends 54b of the slide body 54a have the ends of the bent portions 82b. It rotates with the protrusion 70 by the urging | biasing force which is acting on itself so that it may each guide to the side. By this rotation, both ends 54b of the slide body 54a are respectively held on the terminal sides of both bent portions 82b. Thereby, the one end part of the operation cable 50 can be connected with the support 80 (refer FIG. 7).

  Next, the stay 34a of the active headrest 30 is inserted from the upper side of the through hole 80a of the support 80 in this connected state. At this time, the both ends 54b of the slide body 54a of the inner cable 54 are inserted while being guided into the both receiving grooves 34c of the stay 34a. Then, the slide body 54a is configured such that both ends 54b thereof are guided to the end sides of both receiving grooves 34c and that both ends 54b are returned from the end sides of both bent portions 82b to both linear portions 82a. Rotate to.

  As a result of this rotation, both ends 54b of the slide body 54a are respectively held on the end sides of both receiving grooves 34c. Thereby, the one end part of the operation cable 50 can be connected also to the stay 34a (refer FIG. 8). At this time, as apparent from FIG. 8, the rod 38 is set so as to be disposed inside the stay 34 a so that the lower surface thereof is disposed slightly above the upper surface of the projecting body 70.

  As described above, the slide body 54a has both ends 54b returned from the bent portions 82b to the straight portions 82a, respectively, so that this connected state (one end of the operation cable 50 and the stay 34a are connected). The insertion amount of the stay 34a can be adjusted in the state). In this way, one end of the operation cable 50 is connected to the active headrest 30.

  Further, in the other support 90, the other stay 34b of the active headrest 30 can be inserted. The active headrest 30 can be adjusted to a desired height position and assembled to the seat back 20 by inserting both the stays 34a and 34b.

  Subsequently, returning to FIG. 1, the connection structure of the other end (the lower end in FIG. 1) of the operation cable 50, that is, the connection structure of the operation cable 50 and the clutch mechanism C will be described. Of the other end of the operation cable 50, the other end of the outer cable 52 is hooked on a hook 22 a formed on the side frame 22. The other end of the inner cable 54 is hooked on the operation arm 42 a of the damper 42. In this way, the other end of the operation cable 50 is connected to the clutch C.

  Finally, with reference to FIG. 1, the operation of the vehicle seat 1 will be described. In the vehicle seat 1, as described above, the support plate 36 of the active headrest 30 is substantially integrated with the base portion 32 against the urging force of the tension spring at all times before the rear collision occurs in the vehicle. As shown in FIG. When the pressure receiving member 40 receives a sudden backrest load from the occupant due to a rear collision, the operation arm 42a is rotated by the backrest load, and tension is applied to the inner cable 54 of the operation cable 50. To do. Then, as already described, the protruding body 70 can be caused to jump out of the slide body 54a. Thereby, the rod 38 is pushed up and the lock mechanism R is unlocked. Then, by causing the support plate 36 to pop out by this unlocking, it is possible to reduce the impact generated on the occupant's rear head and improve safety.

  The assembly structure according to the embodiment of the present invention is configured as described above. According to this configuration, the step of rotating the inserted operation cable 50 is not performed by an artificial work as in the prior art, but by the urging force of the torsion spring 76. Therefore, since the step of rotating can be omitted, the operation cable 50 can be easily assembled to the support 80. Further, according to this configuration, the members that can exert the urging force of the torsion spring 76 are only the projecting body 70 and the slide body 54 a that rotates together with the projecting body 70. As a result, the torsion spring 76 with a small urging force can be used, so that one end of the operation cable 50 can be reduced in size. That is, since the torsion spring 76 can be reduced in size, the base member 60 can also be reduced in size.

  Moreover, according to this structure, the end part of the operation cable 50 can be connected also to the stay 34a only by inserting the stay 34a of the active headrest 30 into the support 80 to which the one end part of the operation cable 50 is connected. Therefore, the operation cable 50 can be easily assembled to the stay 34a.

  Moreover, according to this structure, the height position of the active headrest 30 with respect to the seat back 20 can be adjusted. Therefore, as described above, if the base member 60 can be reduced in size, for example, even when the height position of the active headrest 30 with respect to the seat back 20 is set at a lower position (for example, a position that is the lowermost end), the operation cable 50 Can be prevented from interfering with the back side of the seat back 20.

The contents described above are only related to one embodiment of the present invention, and do not mean that the present invention is limited to the above contents.
In the embodiment, the clutch mechanism C has been described as using the damper 42. However, the present invention is not limited to this, and for example, a type using a weight may be used. In that case, it becomes the structure which transmits a passenger | crew's backrest load using the inertial force which acts on a weight when a rear-end collision generate | occur | produces in a vehicle. Of course, clutch mechanisms other than these types may be used.

30 Active headrest 34a Stay 34c Receiving groove 38 Rod 50 Operation cable 52 Outer cable 54 Inner cable 54a Slide body 54b Both ends 60 Base member 70 Projection body 72 Notch 76 Torsion spring (biasing member)
80 Support (tube case)
82 Guide groove 82a Straight part 82b Bent part

Claims (3)

A structure in which an operation cable composed of a cylindrical outer cable and an inner cable that can be inserted through the outer cable is assembled to a cylindrical case,
Of one end of the operation cable,
At one end of the outer cable, a base member that can be fitted inside the cylindrical case is assembled.
One end of the inner cable is inserted into the base member, and a projecting body is assembled via a biasing member to be rotatable around the axis of the inner cable.
On the wall surface of the projecting body, a notch is formed along the axial direction of the inner cable.
At one end of the inner cable, and the slide body forming the slidable substantially T-shaped are assembled along the notch when moved relative to the inner cable outer cable, substantially T of the slide body Both ends of the letter shape are formed in opposite directions so as to protrude from the notch of the projecting body,
On the wall surface of the cylindrical case, guide grooves capable of guiding both ends of the slide body protruding from the cutout portion of the projecting body and both engaging projections of the base member are formed, respectively.
The guide groove is composed of a straight part along the longitudinal direction of the cylindrical case, and a bent part bent from both ends of the linear part to face each other in the circumferential direction of the cylindrical case,
When one end of the operation cable is inserted into one end of the cylindrical case while guiding both ends of the slide body and both engaging protrusions of the base member to the straight portions of the guide grooves, the twist generated in the biasing member As a result, an urging force acts on the slide body as well as the projecting body with the base member as the base point, and both ends of the slide body reach the bent portions of the guide groove in a state where the urging force is applied. The slide body is rotated together with the projecting body by the urging force acting on the slide body so that both ends thereof are guided to the end side of the bent portion, and both ends of the slide body are bent by the rotation. A structure for assembling an operation cable to the cylindrical case, each of which is held at the terminal end of the tube. A structure for assembling the operation cable according to claim 1 to a cylindrical case,
It has an active headrest with a stay with a rod held inside,
On the wall surface of the stay, receiving grooves that can guide both ends of the slide body respectively held at the end sides of both bent portions are formed to be bent so as to be opposite to each other in their circumferential directions. ,
When the tip of the stay is inserted into the other end of the cylindrical case while guiding both ends of the slide body into the two receiving grooves, both ends of the slide body are guided to the end sides of the two receiving grooves. And both ends of the slide body are held back at the end sides of the receiving grooves by the rotation. A structure for assembling an operation cable, which is characterized by being attached to a cylindrical case. A structure for assembling the operation cable according to claim 2 to a cylindrical case,
A structure for assembling an operation cable to the cylindrical case, wherein the amount of insertion of the tip of the stay relative to the other end of the cylindrical case is adjustable .

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