JP2008265585A - Cable assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable assembly arranging a detachable member in a part of a power transmission path. <P>SOLUTION: The cable assembly 1 comprises: a casing cap 2: and a control cable 3. The casing cap comprises: a head member 20 comprising a side wall part 202 comprising a slit 202a, a head side axial direction engage part 202b, and a head side radial-peripheral direction engage part 202f, a top wall part 200, and an opening part 201; and a bottom member 21 comprising a base 213, a spacer 214 for the slit 202a, a bottom side axial direction engage part 210 engaging with the head side axial direction engage part 202b, a bottom side radial-peripheral direction engage part 215 engaging with the head side radial-peripheral direction engage part 202f, and a cable insertion hole 211. The control cable 3 comprises: an outer casing 30 fixed to the bottom member 21; and an inner cable 31 comprising an output side end part 311 comprising a branch end 311a inserted into the slit 202a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cable assembly used for an active headrest device of a vehicle, for example.

  During driving, a gap is often interposed between the head of the occupant and the headrest. When the vehicle is collided, the active headrest device quickly drives the headrest forward. And the clearance gap between a passenger | crew's head and a headrest is narrowed. For this reason, when an active headrest apparatus is used, a passenger | crew's head or neck can be protected from the impact at the time of a rear-end collision.

For example, in Patent Documents 1 and 2, an active movement for driving the headrest forward by driving the headrest frame and the headrest support bracket built in the seat back upward by using the rearward movement load of the occupant's waist generated at the time of the vehicle rear-end collision as an input. Headrest device is introduced.
JP 2006-7830 A JP 2006-7832 A JP-A-10-81162

  In the case of the active headrest device described in Patent Literatures 1 and 2, the headrest is driven via the headrest frame and the headrest support bracket. For this reason, not only the headrest but also the headrest frame and the headrest support bracket must be movable parts. This complicates the structure of the headrest frame and the headrest support bracket, and thus the structure of the seat back.

  The headrest frame and the headrest support bracket are made of metal and are relatively heavy. Since the headrest frame and the headrest support bracket, which are heavy objects, need to be moved upward against gravity, in the case of the active headrest device described in Patent Documents 1 and 2, it is difficult to ensure the speed of operation.

  In this regard, Patent Document 3 introduces an active headrest device that drives only a headrest. The headrest described in Patent Document 3 incorporates an extrusion device for extruding a part thereof forward. On the other hand, a drive device is mounted below the seat cushion. The drive device and the extrusion device are connected by a control cable. The control cable is routed inside the seat back and inside the headrest stay. As the drive piston moves, the inner cable of the control cable is pulled. The extrusion device is driven by the tension.

  In the case of the active headrest device described in Patent Document 3, it is not necessary to drive the headrest frame or the headrest support bracket. For this reason, the structure inside the seat back can be simplified. In addition, it is easy to ensure the speed of operation.

  However, the control cable is routed inside the headrest stay. For this reason, the headrest stay cannot be separated from the headrest support bracket. That is, the headrest cannot be removed from the seat back. Therefore, in the case of the active headrest device of Patent Document 3, the versatility is lacking, and the types of vehicles that can be employed are limited.

  The cable assembly of the present invention has been completed in view of the above problems. Therefore, an object of the present invention is to provide a cable assembly in which a detachable member can be arranged in a part of a power transmission path.

  (1) In order to solve the above problems, a cable assembly of the present invention has a cylindrical side wall having a pair of slits extending in the axial direction, a head side axial engagement portion, and a head side diameter-circumferential meshing portion. A top wall portion that is sealed at one end in the axial direction of the side wall portion and close to the mating member, and the open ends of the pair of slits are connected to the other axial end of the side wall portion. A bottomed cylindrical head member having an opening, a base, a spacer projecting in the axial direction from the base and inserted into the open ends of each of the pair of slits, and the head-side axial relationship A bottom side axial engagement portion that engages with the joint portion and suppresses shakiness in the axial direction, and a bottom side that meshes with the head side diameter-circumferential meshing portion and suppresses shakiness in the radial direction and the circumferential direction. A bottom member that has a diameter-circumferential meshing portion and a cable insertion hole penetrating in the axial direction and seals the opening. A single cap, a cylindrical outer casing having an output side end fixed to the bottom member, and a pair of axially inserted through the outer casing so as to be reciprocally movable in the axial direction. A control cable having an output side end portion having a pair of branch ends that are inserted into the slit so as to be reciprocally movable relative to each other in the axial direction, and tension is applied to the inner cable. To generate an axial compressive force on the outer casing, drive the output side end of the outer casing by a reaction force of the axial compressive force, and the counterpart member at the top wall portion of the casing cap Is moved (corresponding to claim 1).

  When the load is transmitted by transmitting the tension as in the above-mentioned Patent Document 3, the cable for transmitting the tension (in the case of Patent Document 3, the inner cable) needs to be integrated. For this reason, a detachable member cannot be arranged in a part of the power transmission path.

  On the other hand, in the case of the cable assembly of the present invention, the mating member is moved not by tension but by transmission of pressing force. For this reason, among the outer casing, the casing cap, and the counterpart member constituting the power transmission path, the casing cap and the counterpart member are separate. Therefore, the casing cap and the counterpart member can be arranged on separate members. For this reason, the member in which the casing cap is disposed and the member in which the counterpart member is disposed can be separated at times other than during power transmission. Thus, according to the cable assembly of the present invention, a detachable member can be disposed in a part of the power transmission path.

  Further, according to the cable assembly of the present invention, the pressing force is transmitted not by the inner cable but by the outer casing. The outer casing has a larger diameter than the inner cable. For this reason, even when an axial compression force is applied from the casing cap to the outer casing when pressing the mating member, the outer casing is unlikely to be compressed and buckled. Therefore, it is possible to reliably transmit the pressing force.

  According to the cable assembly of the present invention, the pair of slits both reach the opening. For this reason, the pair of branch ends of the inner cable can be inserted into the pair of slits of the casing cap, respectively, very easily without applying an excessive load on the casing cap or the inner cable. Therefore, assembly work is easy. Moreover, there is little possibility that damage will remain to a casing cap or an inner cable by an assembly | attachment operation | work.

  Further, according to the cable assembly of the present invention, the rattling in the axial direction between the head member and the bottom member is suppressed by the engagement between the head-side axial engagement portion and the bottom-side axial engagement portion. be able to. In addition, the radial and circumferential rattling between the head member and the bottom member can be suppressed by the engagement of the head-side diameter-circumferential meshing portion and the bottom-side diameter-circumferential meshing portion.

  In general, in the case of a bottomed cylindrical member, the opening side has lower rigidity than the bottom side. In this respect, also in the case of the head member of the cable assembly of the present invention, the opening side is less rigid than the top wall side. In addition, in the case of the head member, since the pair of slits are connected to the opening, the rigidity on the opening side tends to be lower.

  However, a spacer is interposed at the open end of the slit of the head member. For this reason, it can suppress that a head member deform | transforms in the groove width direction of a slit. Therefore, it can suppress that the rigidity of the part by the side of the opening part of a side wall part falls.

  (2) Preferably, in the configuration of the above (1), the side wall portion has a pair of engagement slits extending in the axial direction and having an open end connected to the opening portion, and the head-side axial direction The engaging portion is preferably interposed between the pair of engaging slits (corresponding to claim 2).

  The head-side axial engagement portion is interposed between the pair of engagement slits in the side wall portion. The section between the pair of engagement slits in the side wall portion can be easily elastically deformed in the radial direction. For this reason, according to this configuration, the head side axial engagement portion and the bottom side axial engagement portion are relatively easily engaged by elastically moving the head side axial engagement portion in the radial direction. Can be combined.

  (3) Preferably, in the configuration of the above (1) or (2), a pair of the head-side axial engagement portion and the bottom-side axial engagement portion are arranged so as to face each other in the radial direction. The pair of slits are arranged so as to oppose each other in the radial direction, and the arrangement direction of the pair of head side axial engagement portions and the arrangement direction of the pair of slits are substantially orthogonal to each other. It is better to have a configuration (corresponding to claim 3).

  According to this configuration, the groove width direction of the pair of slits, the arrangement direction of the pair of head-side axial engagement parts, and the arrangement direction of the pair of bottom-side axial engagement parts substantially coincide. For this reason, when the head member and the bottom member are assembled, the head side axial engagement portion is brought into sliding contact with the bottom member, or the bottom side axial engagement portion is brought into sliding contact with the side wall portion. The opening is easy to expand in the groove width direction. For this reason, a bottom member and a head member can be assembled more simply.

  (4) Preferably, in any one of the configurations (1) to (3), the head-side axial engagement portion is an engaged recess that is recessed in the inner peripheral surface of the side wall portion, The bottom-side axial engagement portion is an engagement convex portion, and the side wall portion further includes the engagement convex portion between the opening and the engaged concave portion. It is better to have a guide recess for guiding (corresponding to claim 4). Here, the “recessed portion” of the engaged recessed portion is a concept including a hole shape penetrating the side wall portion in the inner and outer directions.

  According to this configuration, by aligning the guide concave portion and the engagement convex portion in the axial direction, it is possible to relatively easily align the bottom member and the head member before assembly. Further, by guiding the track of the engaging convex portion with the guide concave portion, the engaging convex portion can be engaged with the engaged concave portion relatively easily.

  (5) Preferably, in any one of the constitutions (1) to (4), the side wall portion is further slid radially on the inner diameter side to the pair of slits and extends in the axial direction. The inner end of the inner cable further includes a shaft portion on which the pair of branch ends project, and the shaft portion is relative to the sliding hole. The pair of branch ends is preferably slidable in the axial direction relative to the pair of slits (corresponding to claim 5).

  According to this configuration, when the casing cap and the output side end of the inner cable move relatively, the output side end is less likely to rattle against the casing cap. For this reason, the operation reliability at the time of power transmission becomes high.

  (6) Preferably, in any one of the constitutions (1) to (5), the head side diameter-circumferential meshing portion is a head protruding in the axial direction from the other axial end of the side wall portion. The bottom-side diameter-circumferential meshing portion is a bottom-side protruding piece projecting in the axial direction from the base, and the head-side protruding piece is the bottom side in the circumferential direction. It is better to adopt a configuration in which rattling in the circumferential direction is suppressed by being inserted between the projecting piece portion and the spacer (corresponding to claim 6).

  According to this configuration, the bottom-side protruding piece (bottom member side), the head-side protruding piece (head member side), and the spacer (bottom member side) are arranged in this order in the circumferential direction. That is, the head-side protruding piece portion is sandwiched between the bottom-side protruding piece portion and the spacer from both sides in the circumferential direction. For this reason, rattling in the circumferential direction between the head member and the bottom member can be suppressed.

  (7) Preferably, in the configuration of the above (6), the bottom member further includes an inner cylinder portion that defines a part of the cable insertion hole and protrudes in the axial direction from the base portion, The side protruding piece portion includes a radial extension portion extending in a radial direction from the inner cylinder portion, and a circumferential extension portion extending in a circumferential direction from the radial extension portion, and the head It is better to adopt a configuration in which at least a part of the side protruding piece portion is interposed between the inner cylindrical portion and the circumferentially extending portion in the radial direction, thereby suppressing radial shakiness ( (Corresponding to claim 7).

  According to this configuration, in the radial direction, the inner cylinder part (bottom member side), at least a part of the head-side protruding piece part (head member side), and the circumferentially extending part (bottom member side) are in this order. Is arranged in. That is, at least a part of the head-side protruding piece portion is sandwiched between the inner cylinder portion and the circumferentially extending portion from both sides in the circumferential direction. For this reason, the shakiness of the radial direction of a head member and a bottom member can be suppressed.

  Moreover, the circumferential direction extension part and the inner cylinder part are connected by the radial direction extension part. For this reason, the circumferentially extending portion is not easily deformed in the radial direction with respect to the inner cylinder portion. Therefore, shakiness in the radial direction between the head member and the bottom member can be firmly suppressed.

  (8) Preferably, in any one of the configurations (1) to (7), the counterpart member is inserted into the headrest stay to transmit an operation force when moving at least a part of the headrest forward. It is better that the output rod is configured (corresponding to claim 8).

  That is, this structure uses the cable assembly of this invention for the power transmission of an active headrest apparatus. In the case of this configuration, at least a part of the headrest is driven forward by pressing the output rod at the top wall portion of the casing cap. For this reason, it is not necessary to drive a headrest frame or a headrest support bracket. Therefore, the structure inside the seat back can be simplified. In addition, it is easy to ensure the speed of operation.

  When the headrest is driven by transmitting tension as in Patent Document 3, the cable for transmitting tension (inner cable in Patent Document 3) needs to be integrated. For this reason, as described above, the headrest cannot be detached from the seat back.

  On the other hand, in the case of this configuration, the headrest is driven not by tension but by transmission of pressing force. For this reason, the casing cap and the output rod are separate from the outer casing, the casing cap, and the output rod that constitute the power transmission path. Specifically, the casing cap, that is, the control cable, is separately disposed on the seat back side, and the output rod is separately disposed on the headrest stay side. For this reason, the headrest can be attached to and detached from the seat back during normal times (for example, when the seat is in a full flat state) while maintaining the function of the active headrest device at the time of the vehicle rear-end collision. Therefore, the versatility with respect to the vehicle type is high.

  ADVANTAGE OF THE INVENTION According to this invention, the cable assembly which can arrange | position a detachable member in a part of power transmission path can be provided.

  Hereinafter, an embodiment in which the cable assembly of the present invention is embodied for power transmission of an active headrest device will be described.

[Cable assembly layout]
First, the arrangement of the cable assembly of this embodiment will be described. FIG. 1 shows a transparent perspective view of a sheet on which the cable assembly of this embodiment is arranged. FIG. 2 shows a transparent perspective view near the headrest stay mounting portion of the seat back of the seat. FIG. 3 shows an exploded perspective view of the vicinity of the headrest stay mounting portion of the seat back of the seat. In the drawings shown below, the azimuth (left and right) is defined with reference to the case of looking forward from the rear of the vehicle. As shown in FIGS. 1 to 3, the seat 9 includes a headrest 90 and a seat back 91.

  A headrest stay 900 projects from the lower edge of the headrest 90. The headrest stay 900 is made of metal and has a cylindrical shape. A pair of headrest stays 900 are arranged on the left and right. Among these, a stay side guide groove 901 is formed at the lower end portion of the right headrest stay 900. The stay side guide groove 901 has a substantially C-shape that extends upward from the lower end opening and curves in the circumferential direction. Two stay side guide grooves 901 are arranged opposite to each other in the radial direction. The right headrest stay 900 is inserted with an output rod 902 made of metal and having a round bar shape. The upper end of the output rod 902 is connected to a locking member (not shown). The locking member locks an urging spring (not shown). The biasing spring accumulates a biasing force for pushing the front portion of the headrest 90 forward.

  A rectangular block-shaped headrest detaching member 910 is attached to the upper edge of the seat back 91. A stay insertion hole (not shown) is formed in the upper surface of the headrest detaching member 910. A pair of headrest detaching members 910 are arranged on the left and right. A push-type button 910 a is disposed on the right headrest detaching member 910.

  A headrest support bracket 911 is embedded below the headrest detaching member 910. The headrest support bracket 911 is made of metal and has a cylindrical shape. A pair of headrest support brackets 911 are arranged on the left and right. The pair of headrest stays 900 are respectively inserted into the pair of headrest support brackets 911 through the stay insertion holes of the headrest attaching / detaching member 910.

  A plurality of recesses (not shown) are formed on the outer peripheral surface of the right headrest stay 900 at predetermined intervals in the axial direction. On the other hand, the right headrest detachable member 910 is provided with a convex portion (not shown) interlocked with the button 910a. By selectively engaging the convex portion with any of the plurality of concave portions, the insertion amount of the headrest stay 900 relative to the headrest support bracket 911, that is, the height of the headrest 90 can be adjusted.

  A bracket guide groove 912 is formed in the right headrest support bracket 911. The bracket-side guide groove 912 has a substantially J-shape that extends upward from the lower end opening and curves downward by a slight amount. The bracket side guide groove 912 is bent in the opposite direction to the bending direction of the stay side guide groove 901. Two bracket-side guide grooves 912 are arranged opposite to each other in the radial direction.

  The cable assembly 1 includes a casing cap 2 and a control cable 3. The cable assembly 1 is routed between the inside of the right headrest support bracket 911 and a metal pressure receiving plate 913 embedded in the lower portion of the seat back 91 (position corresponding to the occupant's waist). The routing path of the cable assembly 1 is substantially S-shaped. A method of attaching the casing cap 2, that is, the cable assembly 1 to the headrest support bracket 911 and the headrest stay 900 will be described in detail later.

[Configuration of cable assembly]
Next, the structure of the cable assembly 1 of this embodiment is demonstrated. FIG. 4 is a perspective view of the casing cap of the cable assembly of the present embodiment. FIG. 5 shows an exploded perspective view of the casing cap. FIG. 6A shows a bottom view of the head member of the casing cap. FIG. 6B shows a top view of the bottom member of the casing cap. FIG. 7 shows a cross-sectional view in the VII-VII direction of FIG.

  The casing cap shown in FIGS. 4 and 5 is obtained by rotating the casing cap shown in FIGS. 2 and 3 by about 45 ° in the circumferential direction. Further, in FIG. 5, for convenience of explanation, the head member is shown in a perspective view seen from below, and the bottom member is shown in a perspective view seen from above. Further, in FIG. 5, a part of the cable body of the inner cable is shown in a transparent manner.

  The casing cap 2 includes a head member 20 and a bottom member 21. The head member 20 is made of polyamide, and includes a top wall part 200, an opening part 201, and a side wall part 202.

  The side wall 202 has a cylindrical shape. The top wall portion 200 has a disk shape. The top wall part 200 seals the upper end of the side wall part 202. On the other hand, the opening 201 is opened at the lower end of the side wall 202. For this reason, the head member 20 has a bottomed cylindrical shape (cup shape) that opens downward as a whole.

  The side wall portion 202 includes a pair of slits 202a, a pair of engaged holes 202b, a pair of guide recesses 202c, a sliding hole 202d, two pairs of engaging slits 202e, and four head-side protruding piece portions 202f. And a stepped portion 202k. Of these, the engaged hole 202b is included in the engaged recess of the present invention.

  The side wall 202 has a stepped cylindrical shape whose diameter is increased downward. That is, as shown in FIG. 7, the internal space of the side wall portion 202 is partitioned into an upper small-diameter cylindrical portion and a lower large-diameter cylindrical portion with the stepped portion 202k as a boundary. Among these, the upper small-diameter cylindrical portion corresponds to the sliding hole 202d.

  Each of the pair of slits 202a has a long hole shape extending in the axial direction. Each of the pair of slits 202a communicates with the sliding hole 202d. The pair of slits 202a are disposed to face each other in the radial direction around the sliding hole 202d. The open ends of the lower edges of the pair of slits 202a are each continuous with the opening 201.

  Each of the pair of engaged holes 202b has a circular hole shape. The pair of engaged holes 202b are disposed in the vicinity of the opening 201. Each of the pair of engaged holes 202b penetrates the side wall portion 202 in the radial direction. The pair of engaged holes 202b are arranged to face each other in the radial direction with the sliding hole 202d as the center. The arrangement direction of the pair of engaged holes 202b and the arrangement direction of the pair of slits 202a are substantially orthogonal to each other.

  The pair of guide recesses 202c are interposed between the pair of engaged holes 202b and the opening 201. The pair of guide recesses 202c are arranged to face each other in the radial direction. The pair of guide recesses 202c have a tapered shape in which the interval gradually decreases upward.

  The two pairs of engagement slits 202e are arranged so as to sandwich the engaged hole 202b and the guide recess 202c from both sides in the circumferential direction. Each of the two pairs of engagement slits 202e penetrates the side wall 202 in the radial direction. The engagement slit 202e extends from the opening 201 to the stepped portion 202k. For this reason, the section having the engaged hole 202b and the guide recess 202c in the side wall portion 202 can be elastically deformed in the radial direction as if it is a cantilever beam having a fixed end near the step portion 202k.

  Four head-side projecting piece portions 202f (indicated by dotted line hatching in FIG. 6A) project downward from the lower end of the side wall portion 202. The head-side protruding piece portion 202f is disposed between the slit 202a and the engagement slit 202e. The head-side protruding piece 202f has a partial arc shape. The head-side projecting piece portion 202 f includes a large arc portion 203 and a small arc portion 204. The large arc portion 203 is disposed on the inner diameter side, and the small arc portion 204 is disposed on the outer diameter side.

  The bottom member 21 is made of polyamide like the head member 20 and has a short-axis columnar shape. The bottom member 21 includes a pair of engaging convex portions 210, a cable insertion hole 211, a base portion 213, a pair of spacers 214, a pair of bottom side protruding piece portions 215, and an inner cylinder portion 216.

  The base 213 has a stepped columnar shape with a diameter decreasing downward. The inner cylinder part 216 has a short-axis cylindrical shape. The inner cylinder part 216 is provided so as to protrude upward from the approximate center of the upper surface of the base part 213.

  The cable insertion hole 211 passes through the base 213 and the inner cylinder 216 in the vertical direction. As shown in FIG. 7, a stepped portion 211 a whose hole diameter decreases upward is formed in the middle of the cable insertion hole 211 in the axial direction.

  A pair of spacers 214 (indicated by 90 ° dotted line hatching in FIG. 6B) protrudes upward from the upper surface of the base 213. The pair of spacers 214 are disposed to face each other in the radial direction around the inner cylinder portion 216. The pair of spacers 214 are respectively inserted in the open ends of the pair of slits 202a.

  A pair of bottom-side protruding piece portions 215 (indicated by 45 ° dotted line hatching in FIG. 6B) protrudes upward from the upper surface of the base portion 213. The pair of bottom-side projecting piece portions 215 are disposed to face each other in the radial direction with the inner cylinder portion 216 as the center. The arrangement direction of the pair of bottom-side protruding piece portions 215 and the arrangement direction of the pair of spacers 214 are substantially orthogonal to each other. The bottom projecting piece 215 includes a radially extending portion 215a and a circumferential extending portion 215b. The circumferentially extending portion 215b has a partial arc shape with the cable insertion hole 211 as the center. The circumferentially extending portion 215 b is disposed on the radially outer side of the inner cylinder portion 216. The outer peripheral surface of the base 213 is depressed so as to be substantially flush with the outer peripheral surface of the circumferentially extending portion 215b in the axial direction. The radially extending portion 215a connects the inner cylinder portion 216 and the circumferentially extending portion 215b in the radial direction. The outer diameter direction end of the radial direction extension part 215a is connected to the substantially circumferential center of the circumferential direction extension part 215b. For this reason, the bottom-side protruding piece 215 has an arrow shape facing outward in the radial direction as a whole.

  In the circumferential direction, the radially extending portion 215a is interposed between the large arc portions 203 of the head-side protruding piece portion 202f. In the circumferential direction, the large arc portion 203 is interposed between the radially extending portion 215 a and the spacer 214. In the circumferential direction, the circumferentially extending portion 215b is interposed between the small arc portions 204 of the head-side protruding piece portion 202f. Further, in the circumferential direction, the small arc portion 204 is interposed between the circumferentially extending portion 215 b and the spacer 214. In the radial direction, the large arc portion 203 is interposed between the inner cylinder portion 216 and the circumferentially extending portion 215b. As described above, the head-side projecting piece 202f, the bottom-side projecting piece 215, the spacer 214, and the inner cylinder 216 mesh with each other in the radial direction and the circumferential direction.

  A pair of engaging convex portions 210 (indicated by 0 ° dotted line hatching in FIG. 6B) protrudes from the outer peripheral surface of the base portion 213. Specifically, the engagement convex portion 210 is disposed in a portion of the outer peripheral surface of the base portion 213 that is continuous with the outer peripheral surface of the circumferentially extending portion 215b. The engaging convex portion 210 has a short-axis cylindrical shape. The upper half of the end surfaces of the pair of engaging convex portions 210 has a tapered surface shape that is sharpened upward. A pair of engagement convex part 210 is arrange | positioned facing the radial direction. The pair of engaging convex portions 210 are engaged with the pair of engaged holes 202 b from the inner diameter side of the side wall portion 202. By the engagement, the bottom member 21 and the head member 20 are firmly integrated in the axial direction.

  The control cable 3 includes an outer casing 30 and an inner cable 31. The outer casing 30 has a three-layered tube shape. That is, the outer casing 30 includes a resin liner (not shown), a steel wire shield layer laminated on the outer diameter side of the liner, and a resin layer coat layer laminated on the outer diameter side of the shield layer. Become. As shown in FIG. 1, the input side end 30a of the outer casing 30 is fixed to a bracket 913a disposed on the left side of the pressure receiving plate 913. On the other hand, as shown in FIG. 7, the output side end 30 b of the outer casing 30 is fixed to the bottom member 21 in a state where it is inserted up to the stepped portion 211 a of the cable insertion hole 211. The output side end 30 b of the outer casing 30 is fixed simultaneously with the molding of the bottom member 21. That is, the output side end 30b is fixed to the bottom member 21 by insert molding in which the resin is filled with the output side end 30b of the outer casing 30 placed in advance in the mold.

  The inner cable 31 includes a cable body 310 and a cable end member 311. Among these, the cable end member 311 is included in the “output side end” of the inner cable of the present invention.

  The cable body 310 has a thin line shape. The cable main body 310 includes a steel wire core wire (not shown) and a number of steel wire strands wound around the core wire. The cable body 310 is inserted into the outer casing 30 so as to be relatively slidable in the axial direction. As shown in FIG. 1, the input side end 310a of the cable body 310 is fixed to a trigger member 913b disposed on the left side of the pressure receiving plate 913. On the other hand, as shown in FIGS. 4, 5, and 7, the output side end 310 b of the cable main body 310 passes through the cable insertion hole 211 and reaches the inside of the casing cap 2.

  The cable end member 311 is made of steel (manufactured by die casting) and has a substantially T shape (hammer head shape). The cable end member 311 includes a pair of branch ends 311a and a shaft portion 311b.

  The shaft portion 311b has a cylindrical shape. The shaft portion 311b is fixed to the output side end portion 310b of the cable body 310. The shaft portion 311b is accommodated in the sliding hole 202d of the side wall portion 202. Here, the outer diameter of the shaft portion 311b is set slightly smaller than the inner diameter of the sliding hole 202d. For this reason, the outer peripheral surface of the shaft portion 311b can be slidably and relatively smoothly in contact with the inner peripheral surface of the sliding hole 202d.

  Each of the pair of branch ends 311a has a small diameter columnar shape. The pair of branch ends 311a is provided so as to protrude in the diameter increasing direction from the side peripheral surface of the shaft portion 311b. The pair of branch ends 311a are disposed in the vicinity of the upper end of the shaft portion 311b. The pair of branch ends 311a are disposed to face each other in the radial direction. The pair of branch ends 311a respectively penetrates the pair of slits 202a in the radial direction. That is, the tips of the pair of branch ends 311 a protrude toward the outer diameter side of the side wall portion 202. Here, the outer diameter of the branch end 311a is set slightly smaller than the groove width of the slit 202a. For this reason, the outer peripheral surface of the branch end 311a can be slid relatively smoothly with the groove side surface of the slit 202a.

[Assembly method of cable assembly]
Next, a method for assembling the cable assembly 1 according to this embodiment will be described. FIG. 8 is an exploded perspective view of the casing cap in the first half of the cable assembly assembling method of the present embodiment. FIG. 9 is an exploded axial sectional view of the casing cap in the assembling method. FIG. 10 shows an enlarged view in the circle X of FIG. FIG. 11 shows an exploded perspective view of the casing cap in the latter half of the assembling method. FIG. 12 shows an axial cross-sectional view of the casing cap after assembly is completed. In addition, the cross-sectional direction of FIG. 9 is the same as that of FIG.

  Prior to assembly, the control cable 3 is attached to the bottom member 21 in advance as shown in FIG. Specifically, the output side end 30 b of the outer casing 30 is fixed to the bottom member 21 in a state where it abuts on the stepped portion 211 a of the cable insertion hole 211. Further, the cable end member 311 protrudes above the bottom member 21 from the cable insertion hole 211. The head member 20 and the bottom member 21 are arranged in series on substantially the same axis. The head member 20 and the bottom member 21 are positioned so that the pair of guide recesses 202c and the pair of engagement protrusions 210 face each other in the vertical direction.

  After the assembly is started, the bottom member 21 is relatively moved closer to the head member 20 in this state. When both members are brought close to each other, as shown in FIG. 8, the pair of branch ends 311 a of the cable end member 311 are inserted into the pair of slit 202 a open ends of the head member 20. Furthermore, when both members are brought close to each other, as shown in FIG. 9, the shaft portion 311 b of the cable end member 311 is inserted into the sliding hole 202 d of the head member 20. At this time, each of the pair of engaging convex portions 210 first approaches the pair of guide concave portions 202c. Here, the pair of guide recesses 202c have a tapered shape in which the interval gradually narrows upward. On the other hand, the cross-sectional shape of the pair of engaging convex portions 210 has a triangular shape that is pointed upward. For this reason, as shown in FIG. 10, the load F0 applied to the guide concave portion 202c from the engaging convex portion 210 is a component force F1 substantially perpendicular to the surface extending direction of the guide concave portion 202c, and a force perpendicular to the load F0. It is decomposed into a component force F2. Among these, the space | interval between a pair of guide recessed parts 202c is expanded by component force F1 (> load F0). Specifically, as shown by a hollow arrow in FIG. 11, a section between the pair of engagement slits 202e in the side wall portion 202 is a piece having a fixed end at the upper end portion of the engagement slit 202e by the component force F1. Like a cantilever, it elastically deforms radially outward. That is, the pair of engaging projections 210 partially expands the opening 201 by using a wedge boosting mechanism.

  In this way, the upper portion of the bottom member 21 is inserted into the inner diameter side of the side wall portion 202 while partially expanding the opening 201. The pair of engaging projections 210 passes through the pair of guide recesses 202c, and then, by the elastic restoring force of the opening 201 once expanded, as shown in FIG. Engage. As described above, the assembly is completed by engaging the pair of engaging convex portions 210 and the pair of engaged holes 202b.

[Attaching method of cable assembly]
Next, a method for attaching the cable assembly 1 of the present embodiment to the headrest support bracket 911 and the headrest stay 900 will be described. The method of attaching the cable assembly 1 of the present embodiment includes a bracket attaching step for attaching the cable assembly 1 to the headrest support bracket 911, and a stay attaching step for attaching the cable assembly 1 attached to the headrest support bracket 911 to the headrest stay 900. Have.

  First, the bracket mounting process will be described. FIG. 13 is a perspective view showing the first half of the bracket mounting process. In FIG. 14, the locus | trajectory with respect to the bracket side guide groove of the branch end in a bracket attachment process is shown.

  In the bracket attaching step, as shown in FIG. 13, the casing cap 2 of the cable assembly 1 is inserted into the lower end of the headrest support bracket 911. Here, the headrest support bracket 911 has a pair of bracket-side guide grooves 912 formed therein. In addition, a pair of branch ends 311 a of the inner cable 31 protrude from the casing cap 2 in the lateral direction. When the casing cap 2 is inserted, the pair of branch ends 311a are inserted into the pair of bracket-side guide grooves 912, respectively. As the insertion depth of the casing cap 2 with respect to the headrest support bracket 911 becomes deeper, the branch end 311a relatively rises in the bracket side guide groove 912 as shown in FIG. Finally, the branch end 311a reaches the curved end 912a of the bracket-side guide groove 912.

  Next, the stay attaching process will be described. FIG. 15 is a perspective view showing a state after the bracket attaching process is completed and before the stay attaching process is started. FIG. 16 shows the arrangement of the branch end with respect to the bracket side guide groove and the stay side guide groove at the start of the stay attaching process. FIG. 17 shows the arrangement of the branch end with respect to the bracket side guide groove and the stay side guide groove in the course of the stay mounting process. FIG. 18 shows the arrangement of the branch end with respect to the bracket-side guide groove and the stay-side guide groove after the stay mounting step.

  In the stay attaching step, as shown in FIG. 15, the headrest stay 900 is inserted into the headrest support bracket 911 through a stay insertion hole formed in the upper surface of the headrest attaching / detaching member 910. At this time, the opening ends 901a of the pair of stay side guide grooves 901 and the curved ends 912a of the pair of bracket side guide grooves 912 are aligned so as to face each other in the vertical direction. When the headrest stay 900 is inserted in this state, as shown in FIG. 16, the branch end 311a housed in the curved end 912a is relatively inserted into the opening end 901a of the stay side guide groove 901. . As the insertion depth of the headrest stay 900 with respect to the headrest support bracket 911 becomes deeper, the branch end 311a moves in the circumferential direction while being regulated by the bracket side guide groove 912 and the stay side guide groove 901 as shown in FIG. . In other words, the branch end 311 a moves in the radial overlap portion between the bracket side guide groove 912 and the stay side guide groove 901. Finally, as shown in FIG. 18, the branch end 311 a reaches the curved end 901 b of the stay side guide groove 901.

  Thus, the attachment of the cable assembly 1 to the headrest support bracket 911 and the headrest stay 900 is completed, and the state shown in FIG. After the attachment, the lower end of the output rod 902 in the headrest stay 900 is disposed immediately above the top wall portion 200 of the casing cap 2.

[How to remove the headrest]
Next, a method for detaching the headrest 90 from the seat back 91 will be described. When removing the headrest 90 shown in FIG. 1 from the seat back 91, the headrest stay 900 is pulled upward from the headrest support bracket 911 while pressing the button 910a of the headrest attaching / detaching member 910 shown in FIG. That is, the headrest stay 900 is pulled upward from the headrest support bracket 911 in a state where the engagement between the concave portion on the outer peripheral surface of the headrest stay 900 and the convex portion of the headrest detachable member 910 is released.

  At this time, the branch end 311a moves in the bracket-side guide groove 912 from the straight line portion to the curved end 912a while drawing the locus of FIG. 18 → FIG. 17 → FIG. In addition, the branch end 311a moves in the stay side guide groove 901 from the curved end 901b to the opening end 901a. That is, the branch end 311a is transferred from the curved end 901b of the stay side guide groove 901 to the curved end 912a of the bracket side guide groove 912.

  On the contrary, when the headrest 90 shown in FIG. 1 is attached to the seat back 91, the headrest stay 900 is inserted into the headrest support bracket 911 while pressing the button 910a of the headrest detachable member 910 shown in FIG. The movement at this time is the same as that in the stay attaching step in [Cable assembly attaching method].

[Headrest height adjustment method]
Next, a method for adjusting the height of the headrest 90 relative to the seat back 91 will be described. When adjusting the height of the headrest 90 with respect to the seat back 91 shown in FIG. 1, the headrest stay 900 is moved relative to the headrest support bracket 911 while pressing the button 910a of the headrest detaching member 910 shown in FIG. Move up or down. That is, the headrest stay 900 is moved upward or downward with respect to the headrest support bracket 911 in a state where the engagement between the concave portion on the outer peripheral surface of the headrest stay 900 and the convex portion of the headrest detachable member 910 is released.

  Here, as shown in FIG. 2 and FIG. 18, the bracket end guide groove 912 is in a state where the branch end 311a is engaged with the curved end 901b of the stay side guide groove 901 after the cable assembly attachment is completed. It is arranged in the straight part. For this reason, the branch end 311a can move the straight part of the bracket side guide groove 912 in the vertical direction together with the curved end 901b.

  Within the vertically movable range of the branch end 311a, the relative height of the curved end 901b, that is, the stay side guide groove 901, with respect to the bracket side guide groove 912 can be freely set. In other words, the occupant can freely set the relative height of the headrest 90 with respect to the seat back 91 within the up-and-down direction movable range of the branch end 311a.

[Movement of cable assembly during vehicle rear-end collision]
Next, the movement of the cable assembly 1 of this embodiment at the time of a vehicle rear-end collision will be described. FIG. 19A shows a schematic diagram of the cable assembly of the present embodiment before the vehicle rear-end collision. FIG. 19B is a schematic diagram of the cable assembly at the time of vehicle rear-end collision. FIG. 20 shows an axial sectional view of the casing cap of the cable assembly of the present embodiment before the vehicle rear-end collision. FIG. 21 is a sectional view in the axial direction of the casing cap of the cable assembly at the time of a vehicle collision.

  Before the vehicle rear-end collision, as shown in FIG. 19A, the input side end 30a of the outer casing 30 is fixed to the bracket 913a. The input side end 310a of the cable body 310 of the inner cable 31 is connected to the trigger member 913b. Further, as shown in FIG. 20, the lower end of the output rod 902 is disposed immediately above the top wall portion 200 of the head member 20. Further, the output side end 30 b of the outer casing 30 is connected to the bottom member 21 of the casing cap 2. Further, the pair of branch ends 311 a of the cable end member 311 of the inner cable 31 are respectively inserted into the pair of slits 202 a, the pair of stay side guide grooves 901, and the pair of bracket side guide grooves 912 of the head member 20. (See Figure 2 above).

  Here, the pair of branch ends 311a is engaged with the curved ends 901b of the pair of stay side guide grooves 901 (see FIG. 18). Further, the headrest stay 900 is fixed to the headrest support bracket 911 by a button 910 a of the headrest detaching member 910. Therefore, the pair of branch ends 311a is immovable with respect to the pair of stay side guide grooves 901 (that is, the headrest stay 900) and the pair of bracket side guide grooves 912 (that is, the headrest support bracket 911). On the other hand, the pair of branch ends 311 a can move in the vertical direction relatively with respect to the pair of slits 202 a of the head member 20.

  At the time of the vehicle rear-end collision, the occupant is pressed against the seat back 91. For this reason, a load is input from the occupant waist to the pressure receiving plate 913 via the front surface of the seat back 91. As shown in FIG. 19B, the trigger member 913b is pulled downward by the load. Here, as described above, the pair of branch ends 311a of the cable end member 311 of the inner cable 31 is immovable with respect to the pair of stay side guide grooves 901 and the pair of bracket side guide grooves 912, respectively. For this reason, when the trigger member 913b is pulled, the inner cable 31 tends to deform so as to approach the straight line L so as to connect the trigger member 913b and the cable end member 311 with the shortest distance.

  At this time, the outer casing 30 also tends to deform following the inner cable 31. For this reason, an axial compression force is applied to the outer casing 30. Here, as described above, the input side end portion 30a of the outer casing 30 is fixed to the bracket 913a and does not move. Therefore, the output side end 30b of the outer casing 30 moves upward by the reaction force of the axial compression force. In other words, the casing cap 2 is raised. As shown in FIG. 21, the rising casing cap 2 pushes up the output rod 902. Therefore, the engagement of the locking member with the urging spring is released, and the front portion of the headrest 90 protrudes forward (specifically, the front upper side) quickly due to the urging force accumulated in the urging spring. The protruding headrest 90 approaches the occupant's rear head and protects the occupant from whiplash and the like.

[Function and effect]
Next, the effect of the cable assembly 1 of this embodiment is demonstrated. According to the cable assembly 1 of this embodiment, a part of the headrest 90 can be driven forward by pressing the output rod 902 with the top wall portion 200 of the casing cap 2. For this reason, it is not necessary to drive a headrest frame or a headrest support bracket. Therefore, the structure inside the seat back 91 can be simplified. In addition, it is easy to ensure the speed of operation.

  Further, when driving the headrest 90 by transmitting tension as in the above-mentioned Patent Document 3, the cable for transmitting the tension (in the case of Patent Document 3, the inner cable) needs to be integrated. For this reason, as described above, the headrest 90 cannot be detached from the seat back 91.

  On the other hand, in the case of the cable assembly 1 of the present embodiment, the headrest 90 is driven not by tension but by transmission of pressing force. For this reason, the casing cap 2 and the output rod 902 are separate from the outer casing 30, the casing cap 2, and the output rod 902 that constitute the power transmission path. Specifically, the casing cap 2, that is, the control cable 3 is disposed separately on the seat back 91 side, and the output rod 902 is disposed separately on the headrest stay 900 side. For this reason, the headrest 90 can be attached to and detached from the seat back 91 in a normal state (for example, when the seat is in a full flat state) while ensuring the function of the active headrest device at the time of the vehicle rear-end collision. For this reason, the versatility with respect to a vehicle type is high.

  Moreover, the casing cap 2 is not an integral part, but is composed of two parts, a head member 20 and a bottom member 21. If the casing cap 2 is an integral part and the output side end 30b of the outer casing 30 is to be fixed to the casing cap 2 at the same time as molding (see FIG. 20), it is necessary to dispose a molding pin. The molding pin is inserted into the cavity so as to penetrate the top wall portion 200 forming portion in the vertical direction, and is disposed so as to close the end surface of the output side end portion 30b of the outer casing 30. By inserting the forming pin, a portion of the cable insertion hole 211 above the step portion 211a can be formed. In addition, the inflow of the resin into the outer casing 30 can be prevented. However, when the molding pin is inserted, a hole remains as a molding pin insertion mark in the top wall portion 200 after molding. It is difficult to press the output rod 902 in the state where the hole remains in the top wall portion 200. For this reason, a part for closing the hole is required separately. In addition, an operation process for attaching the component is also required. Moreover, as long as it is a site | part which presses the output rod 902 directly, it is preferable that the structure of the top wall part 200 is simple. That is, it is preferable that the top wall portion 200 is a single piece.

  In this respect, the casing cap 2 of the cable assembly 1 of the present embodiment is composed of two parts, a head member 20 and a bottom member 21. The output member end 30b of the outer casing 30 is fixed to the bottom member 21. On the other hand, the top member 20 that presses the output rod 902 is disposed on the head member 20. For this reason, the output side end portion 30 b of the outer casing 30 can be fixed simultaneously with the molding of the bottom member 21. In addition, when the head member 20 is molded, a molding pin is not necessary, so there is no possibility that a hole is formed in the top wall portion 200.

  Further, according to the cable assembly 1 of the present embodiment, the pressing force is transmitted not by the inner cable 31 but by the outer casing 30. The outer casing 30 has a larger diameter than the inner cable 31. For this reason, when the output rod 902 is pushed up, even if an axial compression force is applied from the casing cap 2 to the outer casing 30, the outer casing 30 is unlikely to undergo compression buckling. Therefore, it is possible to reliably transmit the pressing force.

  Moreover, according to the cable assembly 1 of this embodiment, the bottom member 21 and the head member 20 are assembled | attached by the engagement convex part 210 and the to-be-engaged hole 202b engaging. For this reason, the bottom member 21 and the head member 20 can be assembled with one touch.

  Further, according to the cable assembly 1 of the present embodiment, the guide recess 202 c is formed in the vicinity of the opening 201 of the head member 20. For this reason, when the bottom member 21 is inserted, the alignment of the engaging convex portion 210 is easy. Further, the wedge force increasing mechanism shown in FIG. 10 can push the section between the pair of engagement slits 202e in the side wall portion 202 radially outward with a small load F0. Therefore, assembly work is easy. In particular, when a large number of casing caps 2 are assembled continuously, the work load on the operator can be reduced.

  Further, according to the cable assembly 1 of the present embodiment, as shown in FIG. 7, the cable end member 311 is fixed to the output side end 310b in advance before the head member 20 and the bottom member 21 are assembled. I can keep it. For this reason, after the head member 20 and the bottom member 21 are assembled, the assembling work is easier as compared with the case where the cable end member 311 is fixed to the output side end portion 310b. In addition, the head member 20 and the bottom member 21 can be assembled after the work related to the control cable 3 such as the adjustment of the floating length of the inner cable 31 is completed.

  In addition, if at least one of the pair of slits 202a has an endless long hole shape, an excessive load is applied when the cable end member 311 is inserted into the slit, causing some damage to the casing cap 2 or the cable end member 311. May remain.

  In this regard, the pair of slits 202a of the cable assembly 1 of the present embodiment are both continuous with the opening 201 and have an end-like long hole shape. For this reason, as described above, the cable end member 311 can be inserted into the pair of slits 202a relatively easily only by bringing the bottom member 21 relatively close to the head member 20. Therefore, there is little possibility that damage will remain in the casing cap 2 or the cable end member 311.

  Further, according to the cable assembly 1 of the present embodiment, the arrangement direction of the pair of engaged holes 202b (or the arrangement direction of the pair of engaging convex portions 210) is substantially orthogonal to the arrangement direction of the pair of slits 202a. is doing. For this reason, the groove width direction of the pair of slits 202a and the direction of the component force F1 applied to the pair of guide recesses 202c from the pair of engaging projections 210 during assembly (see FIG. 10 above) substantially coincide. Yes. Therefore, when the bottom member 21 is inserted, the groove width of the pair of slits 202a is easily widened. That is, the opening 201 is easy to expand. Also in this respect, the assembling work is easy.

  Further, according to the cable assembly 1 of the present embodiment, the outer diameter of the shaft portion 311b is set slightly smaller than the inner diameter of the sliding hole 202d. For this reason, when the cable end member 311 descends relatively in the casing cap 2 at the time of a vehicle rear-end collision, compared to the case where the outer diameter of the shaft portion 311b is extremely smaller than the inner diameter of the sliding hole 202d. (See FIG. 21 above), the cable end member 311 is less likely to rattle relative to the casing cap 2. In addition, the smooth movement of the cable end member 311 is less likely to be restricted by the sliding resistance than when the outer diameter of the shaft portion 311b is substantially the same as the inner diameter of the sliding hole 202d. Therefore, the cable assembly 1 of this embodiment has high operational reliability.

  Further, according to the cable assembly 1 of the present embodiment, the outer diameter of the branch end 311a is set slightly smaller than the groove width of the slit 202a. For this reason, when the outer diameter of the branch end 311a is extremely smaller than the groove width of the slit 202a, the cable end member 311 is relatively lowered in the casing cap 2 at the time of the vehicle rear-end collision ( 21), the cable end member 311 is less likely to rattle relative to the casing cap 2. In addition, as compared with the case where the outer diameter of the branch end 311a and the groove width of the slit 202a substantially coincide with each other, the smooth movement of the cable end member 311 is less likely to be restricted by the sliding resistance. Therefore, the cable assembly 1 of this embodiment has high operation reliability also in this respect.

  In general, in the case of a bottomed cylindrical member, the opening side has lower rigidity than the bottom side. In this regard, also in the case of the head member 20 of the cable assembly 1 of the present embodiment, the rigidity on the opening 201 side is lower than that on the top wall part 200 side. In addition, in the case of the head member 20, since the pair of slits 202a are connected to the opening 201, the rigidity on the opening 201 side tends to be lower.

  However, spacers 214 are inserted in the open ends of the pair of slits 202a. For this reason, it can suppress that the head member 20 deform | transforms in the groove width direction of the slit 202a. Therefore, it can suppress that the rigidity of the part by the side of the opening part 201 of the side wall part 202 falls.

  Moreover, according to the cable assembly 1 of this embodiment, the insertion depth of the bottom member 21 with respect to the side wall part 202 is regulated by the step part 202k. For this reason, there is no possibility that the bottom member 21 enters the sliding hole 202d. In other words, the axial length of the sliding hole 202d, that is, the stroke of the cable end member 311 can be adjusted by the position of the stepped portion 202k.

  Further, according to the cable assembly 1 of the present embodiment, the inner diameter of the headrest support bracket 911 and the outer diameter of the lower portion (large diameter portion) of the side wall portion 202 and the base portion 213 are substantially the same. For this reason, it is possible to prevent the casing cap 2 from rattling in the headrest support bracket 911.

  Further, according to the cable assembly 1 of the present embodiment, the inner diameter of the headrest stay 900 and the outer diameter of the upper portion (small diameter portion) of the side wall 202 are substantially the same. For this reason, it is possible to prevent the casing cap 2 from rattling in the headrest stay 900.

  Further, according to the cable assembly 1 of the present embodiment, the shakiness in the axial direction between the head member 20 and the bottom member 21 is mainly caused by the engagement between the engaged hole 202b and the engaging convex portion 210. Can be suppressed.

  Further, according to the cable assembly 1 of this embodiment, the radial and circumferential rattling between the head member 20 and the bottom member 21 is as shown in FIG. It can be suppressed by meshing with the bottom projecting piece 215. That is, according to the cable assembly 1 of the present embodiment, the head-side projecting piece portion 202f, the bottom-side projecting piece portion 215, the spacer 214, and the inner cylinder portion 216 mesh with each other in the radial direction and the circumferential direction. . For this reason, rattling in the radial direction and the circumferential direction can be suppressed.

  In particular, the circumferentially extending portion 215b may be pressed radially outward by the large arc portion 203. However, the circumferentially extending portion 215b is connected to the inner cylinder portion 216 via the radially extending portion 215a. For this reason, there is little possibility that the circumferentially extending portion 215b is deformed radially outward. Therefore, there is little possibility that the space | interval of the circumferential direction extension part 215b and the inner cylinder part 216 outer peripheral surface will expand. Therefore, the rattling in the radial direction between the head member 20 and the bottom member 21 is extremely small.

  Further, according to the cable assembly 1 of the present embodiment, the engaged hole 202b is interposed between the pair of engaging slits 202e in the side wall portion 202. A section between the pair of engagement slits 202e in the side wall portion 202 can be easily elastically deformed in the radial direction. For this reason, the engaged hole 202b and the engaging convex part 210 can be engaged with each other relatively easily by elastically moving the engaged hole 202b radially outward.

  The embodiment of the cable assembly of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  For example, in the above embodiment, the headrest 90 is driven by the urging force accumulated in the urging spring. However, the headrest 90 may be driven by the pressing force itself transmitted from the outer casing 30 → the casing cap 2 → the output rod 902. Further, instead of the pressure receiving plate 913, for example, a sensor may be arranged at the rear of the vehicle, and an operation force may be applied to the inner cable 31 using a signal from the sensor as a trigger.

  Further, the number of the engagement holes 202b, the guide recesses 202c, and the engagement protrusions 210 is not particularly limited. For example, three at every 120 ° and four at every 90 ° may be arranged. Further, the engaged hole 202b may be disposed on the bottom member 21, and the engaging convex portion 210 may be disposed on the head member 20, respectively. Further, the shape, the number of arrangement, and the like of the head-side protruding piece portion 202f and the bottom-side protruding piece portion 215 are not particularly limited. For example, one of the spline coupling mechanisms (or serration coupling mechanisms) may be the head-side projecting piece 202f and the other may be the bottom-side projecting piece 215.

  In the above embodiment, the output side end 30b of the outer casing 30 is fixed simultaneously with the molding of the bottom member 21, but the bottom member 21 is first molded and then output to the cable insertion hole 211 of the bottom member 21. The output side end 30b may be fixed by inserting the side end 30b and finally fitting a metal socket on the bottom member 21. When the bottom member 21 is made of metal, the output side end 30b may be fixed by crimping the bottom member 21 itself.

  Also, the method for joining the cable end member 311 to the cable body 310 of the inner cable 31 is not particularly limited. In addition to casting, joining may be performed by welding, caulking, or the like.

  Further, the material of each member constituting the cable assembly 1 is not particularly limited. For example, the casing cap 2 may be made of other resin such as polyoxymethylene. Further, it may be made of metal. Moreover, the material of the wire which comprises the control cable 3, the number of twists, etc. are not specifically limited.

  Moreover, in the said embodiment, although the cable assembly of this invention was used for active headrest apparatuses, the cable assembly of this invention can be used for various apparatuses which perform power transmission by pressing.

It is a permeation | transmission perspective view of the sheet | seat in which the cable assembly of one Embodiment of this invention is arrange | positioned. It is a permeation | transmission perspective view of the headrest stay vicinity vicinity of the seat back of the seat. It is a disassembled perspective view of the vicinity of the headrest stay mounting portion of the seat back of the seat. It is a perspective view of the casing cap of the cable assembly. It is a disassembled perspective view of the casing cap. (A) is a bottom view of the head member of the casing cap. (B) is a top view of the bottom member of the casing cap. It is a VII-VII direction sectional view of Drawing 5. It is a disassembled perspective view of the casing cap in the first half of the assembly method of the cable assembly. FIG. 4 is an exploded axial sectional view of a casing cap in the assembling method. FIG. 10 is an enlarged view in a circle X of FIG. 9. It is a disassembled perspective view of the casing cap in the latter half of the assembling method. It is an axial sectional view of a casing cap after completion of assembly. It is a perspective view which shows the state of the bracket attachment process first half in the attachment method of the cable assembly. It is a schematic diagram which shows the locus | trajectory with respect to the bracket side guide groove of the branch end in the same process. It is a perspective view which shows the state after completion | finish of a bracket attachment process and before a stay attachment process start. It is a schematic diagram which shows arrangement | positioning with respect to the bracket side guide groove and stay side guide groove of the branch end at the time of a stay attachment process start. It is a schematic diagram which shows arrangement | positioning with respect to the bracket side guide groove and stay side guide groove of the branch end in the middle of the process. It is a schematic diagram which shows arrangement | positioning with respect to the bracket side guide groove and stay side guide groove of the branch end after the process completion | finish. (A) is a schematic diagram of the cable assembly before the vehicle rear-end collision. (B) is the schematic diagram of the cable assembly at the time of a vehicle rear-end collision. It is an axial sectional view of the casing cap of the cable assembly before the vehicle rear-end collision. It is an axial sectional view of a casing cap of the cable assembly at the time of a vehicle rear-end collision.

Explanation of symbols

1: Cable assembly.
2: casing cap, 20: head member, 21: bottom member, 200: top wall, 201: opening, 202: side wall, 202a: slit, 202b: engaged hole (engaged recess), 202c: Guide recess, 202d: sliding hole, 202e: slit for engagement, 202f: head-side protruding piece, 202k: stepped portion, 203: large arc portion, 204: small arc portion, 210: engagement convex portion, 211: cable Insertion hole, 211a: stepped portion, 213: base portion, 214: spacer, 215: bottom side protruding piece portion, 215a: radially extending portion, 215b: circumferentially extending portion, 216: inner cylinder portion.
3: control cable, 30: outer casing, 30a: input side end, 30b: output side end, 31: inner cable, 310: cable body, 310a: input side end, 310b: output side end, 311: Cable end member (output side end portion), 311a: branch end, 311b: shaft portion.
9: Seat, 90: Headrest, 91: Seatback, 900: Headrest stay, 901: Stay side guide groove, 901a: Open end, 901b: Curved end, 902: Output rod, 910: Headrest detachable member, 910a: Button, 911: Headrest support bracket, 912: Bracket side guide groove, 912a: curved end, 913: pressure receiving plate, 913a: bracket, 913b: trigger member.
F0: Load, F1: Component force, F2: Component force, L: Straight line.

Claims (8)

A cylindrical side wall portion having a pair of slits extending in the axial direction, a head side axial engagement portion, and a head side diameter-circumferential meshing portion, and sealing one end of the side wall portion in the axial direction and the other side A bottomed cylindrical head member having a top wall portion disposed close to the member and an opening portion opened at the other axial end of the side wall portion and connected to the open ends of the pair of slits;
A base portion, a spacer projecting in the axial direction from the base portion, and inserted into the open ends of each of the pair of slits, and the head side axial engagement portion are engaged to suppress axial shakiness. A bottom-side axial engagement portion, a bottom-side radial-circumferential meshing portion that meshes with the head-side diameter-circumferential meshing portion to suppress radial and circumferential rattling, and a cable that penetrates in the axial direction A bottom member that has a hole and seals the opening;
A casing cap having
A cylindrical outer casing having an output side end fixed to the bottom member;
An output having a pair of branch ends that are inserted into the outer casing so as to be reciprocally movable in the axial direction, penetrate the cable insertion holes, and are respectively inserted into the pair of slits so as to be reciprocally movable in the axial direction. An inner cable having side ends;
A control cable having
With
By applying tension to the inner cable, an axial compressive force is generated in the outer casing, and the output side end of the outer casing is driven by a reaction force of the axial compressive force, and the top wall of the casing cap Cable assembly for moving the mating member at a portion. The side wall portion has a pair of engagement slits extending in the axial direction and having an open end connected to the opening portion,
The cable assembly according to claim 1, wherein the head-side axial engagement portion is interposed between the pair of engagement slits. The head-side axial engagement portion and the bottom-side axial engagement portion are each arranged in a pair so as to face each other in the radial direction,
The pair of slits are arranged to face each other in the radial direction,
The cable assembly according to claim 1 or 2, wherein an arrangement direction of the pair of head-side axial engagement portions and an arrangement direction of the pair of slits are substantially orthogonal to each other. The head-side axial engagement portion is an engaged recess recessed in the inner peripheral surface of the side wall portion,
The bottom-side axial engagement portion is an engagement convex portion,
The side wall portion further includes a guide concave portion that guides the engaging convex portion to the engaged concave portion between the opening and the engaged concave portion. The cable assembly as described. The side wall portion further has, on the inner diameter side, a sliding hole that communicates with the pair of slits in the radial direction and extends in the axial direction.
The output side end portion of the inner cable further includes a shaft portion on which a pair of branch ends project.
The shaft portion is slidable in the axial direction relative to the sliding hole,
The cable assembly according to any one of claims 1 to 4, wherein the pair of branch ends are slidable in the axial direction relative to the pair of slits. The head-side diameter-circumferential meshing portion is a head-side protruding piece portion protruding in the axial direction from the other axial end of the side wall portion,
The bottom-side diameter-circumferential meshing portion is a bottom-side protruding piece portion protruding in the axial direction from the base portion,
6. The head-side projecting piece portion is interposed between the bottom-side projecting piece portion and the spacer in the circumferential direction, thereby suppressing rattling in the circumferential direction. The cable assembly as described. The bottom member further has an inner cylinder part that partitions a part of the cable insertion hole and projects in an axial direction from the base part,
The bottom projecting piece has a radially extending portion extending in the radial direction from the inner cylinder portion, and a circumferential extending portion extending in the circumferential direction from the radially extending portion,
The at least part of the said head side protrusion piece part is interposed between this inner cylinder part and this circumferential direction extension part in radial direction, and suppresses shakiness of radial direction. Cable assembly.   The cable assembly according to any one of claims 1 to 7, wherein the counterpart member is an output rod that is inserted into the headrest stay to transmit an operation force when moving at least a part of the headrest forward. .

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