JP4671980B2 - Operating device - Google Patents

Description

  The present invention relates to an operating device provided in a lumbar support mechanism for a vehicle seat, and more particularly to an operating device including a pulley that winds a cable-shaped body such as a cable or a wire connected to a driven member.

In Patent Document 1, a cable is wound around a pulley when rotation is input to a shaft that can be rotated, and conversely, a torsion spring provided in the drum is used for rotation input from the cable side to the pulley. A brake mechanism has been proposed that frictionally engages the drum inner wall to prevent rotation of the shaft and pulley.
JP 2006-105337 A

  In Patent Document 1, the brake unit itself does not have a built-in operation amount control mechanism (stopper) that regulates the cable pulling amount and the shaft operation rotation amount, and these are regulated by an external operation amount control mechanism. Yes. However, when this type of device is used for a seat lumbar support device or the like, an operation amount control mechanism cannot be externally attached due to layout limitations, and it is required to incorporate an operation amount control mechanism in the brake unit. However, when the operating angle of the shaft and pulley exceeds one rotation in order to secure the cable pulling amount, the structure of the control mechanism becomes complicated, which may increase the size and cost of the device. Therefore, an object of the present invention is to provide an operating device having a high degree of freedom in setting a rotational operation amount (traction amount of a cable-like body such as a cable) while being a small and inexpensive configuration.

  The present invention is an operating device that winds and unwinds a cord-like body connected to a driven member by forward and reverse rotation of a rotating shaft, and is a spiral that is inclined with respect to the axial direction of the rotating shaft A pulley that winds and feeds the cord-like body along the lead groove by forward and reverse rotation given by the rotating shaft, and a winding amount of the cord-like body around the pulley. A stopper mechanism that regulates the amount of feeding, and the stopper mechanism is configured such that when the pulley rotates in the forward and reverse directions, the axial direction of the rotary shaft is on the lead groove of the pulley while being restricted in the rotational direction of the rotary shaft. And a stopper member that is moved forward and backward, and a movement restricting means that determines the advancing and retracting movement end of the stopper member.

  A cylindrical pulley case for storing the pulley is provided, and a stopper member is supported in a guide hole formed on the peripheral surface of the pulley case so as to be movable in the axial direction of the rotating shaft, and abuts against the end of the guide hole. If the movement restricting means is configured so that the forward / backward movement of the stopper member is restricted, the structure can be simplified, which is preferable.

  The stopper member is provided with a cord holding part extending in the axial direction of the rotary shaft from the annular part along the inner peripheral surface of the pulley case, and the stopper member side cord holding part and the peripheral part are provided on the inner peripheral surface of the pulley case. It is equipped with cable-shaped body pressing ridges that are provided at different positions in the direction, and this cable-shaped body holding section and cable body holding ridges prevent deflection of the cable-shaped body wound on the pulley lead groove. Can be configured.

  For example, the stopper member is restricted from rotating by the rotation restricting means while the stopper member is restricted from rotating by the rotation restricting means in accordance with the rotation of the pulley. What is necessary is just to engage a member so that sliding is possible. Alternatively, the stopper member is provided with a rope guide portion through which the rope-like body is inserted, and the rotation shaft is connected to the stopper member via the rope guide portion according to a change in the winding position of the rope body with respect to the lead groove of the pulley. It is also possible to give a moving force in the axial direction.

  According to the present invention described above, it is possible to obtain an operating device having a high degree of freedom in setting a rotational operation amount (traction amount of a cord-like body) while having a small and inexpensive configuration.

  As shown in FIG. 1, the operating device 10 includes a brake case 12, a pulley case 13, a shaft 14, a torsion spring 15, a pulley 16, and a stopper 17.

  The brake case 12 has a cylindrical brake drum 20 and a flange portion 21, a shaft support hole 22 is formed in the bottom portion of the brake drum 20, and four fixing holes 23 are formed in the flange portion 21. The pulley case 13 has a cylindrical pulley drum 30 and a flange portion 31. A shaft support hole 32 is formed in the bottom portion of the pulley drum 30, and four fixing holes 33 are formed in the flange portion 31. The brake case 12 and the pulley case 13 are combined with the flange portion 21 and the flange portion 31 facing each other, and fixing screws are inserted into the four fixing holes 23 and 33, respectively, and attached to a base member (not shown).

  The shaft 14 is pivotally fitted in the shaft support hole 22 of the brake case 12 so as to be pivotable. The shaft 14 is pivotally fitted in the shaft support hole 32 of the pulley case 13. A pair of rotation transmitting portions 42 and 43 that are positioned between the support portions 40 and 41 and have a fan shape larger in diameter than the rotation support portions 40 and 41, and extend from the rotation support portion 40 to the outside of the brake case 12. And an operation input unit 44 protruding in the direction. The operation input unit 44 is connected to a rotation operation member (not shown), and the shaft 14 can be rotated through the rotation operation member.

  The pulley 16 is formed in a cylindrical portion 60 located inside the pulley drum 30, a flange portion 61 located at the end of the cylindrical portion 60, and a partial region in the circumferential direction on the flange portion 61. The rotation transmission part 62 and the center hole 63 through which the rotation support part 41 is inserted are provided. As shown in FIG. 3, the lower end portion of the center hole 63 is fitted so as to be rotatable with respect to the outer peripheral surface of the cylindrical cut-and-raised portion forming the shaft support hole 32. The rotation transmission part 62 of the pulley 16 is positioned between the rotation transmission parts 42 and 43 of the shaft 14 in the circumferential direction around the rotation axis of the shaft 14 and the pulley 16. The outer peripheral surfaces of the rotation transmission portions 42 and 43 on the shaft 14 side and the outer peripheral surface of the rotation transmission portion 62 on the pulley 16 side are positioned on substantially the same peripheral surface and face the inner peripheral surface of the brake drum 20.

  The torsion spring 15 includes a coil portion 50 supported on the outer peripheral surfaces of the rotation transmitting portions 42, 43, and 62 in the shaft 14 and the pulley 16, and a pair of spring end portions 51 extending in the inner diameter direction of the coil portion 50. , 52 and a torsion coil spring. The pair of spring end portions 51 and 52 are positioned between the circumferential end surfaces of the rotation transmission portions 42 and 43 on the shaft 14 side and the rotation transmission portion 62 on the pulley 16 side, and rotate the shaft 14 via the torsion spring 15. , The torsion spring 15 is tightened and frictional force is not generated between the torsion spring 15 and the brake drum 20. That is, the torsion spring 15 transmits rotational force to the pulley 16 without applying resistance when the shaft 14 side is rotated, but rotation input is made to the pulley 16 side without rotating the shaft 14. In this case, the coil portion 50 is expanded in diameter, and is configured to be frictionally engaged with the inner peripheral surface of the brake drum 20 to restrict rotation.

  One end of a cable (cord-like body) 18 is connected to the pulley 16. A spiral lead groove 64 that is inclined with respect to the rotational axis of the pulley 16 is formed on the outer peripheral surface of the cylindrical portion 60 of the pulley 16, and the cable 18 is wound along the lead groove 64. Can do. The cable 18 extends outward through a cable insertion hole 35 formed in the pulley drum 30 and is connected to a driven member (not shown) through a cable guide 80 (outer cable) shown in FIG. Although the present invention does not limit the driven member, for example, the constituent member of the lumbar support mechanism of the vehicle seat can be driven via the cable 18.

  The stopper 17 has an annular portion 70 along the inner peripheral surface of the pulley drum 30 and a pair of guide protrusions 71 formed on the outer peripheral surface of the annular portion 70, and the pair of guide protrusions 71 are respectively provided on the pulley drum 30. It fits into a pair of stopper guide holes 34 formed on the peripheral surface. Each stopper guide hole 34 allows the guide protrusion 71 to slide in the axial direction of the pulley 16 and restricts the movement of the guide protrusion 71 in the rotational direction of the pulley 16. That is, the stopper 17 can be moved in the axial direction of the pulley 16 and is supported by the pulley drum 30 in a state in which the rotation is restricted. A lead groove engaging portion 72 (FIGS. 3 to 5) that is slidably engaged with the lead groove 64 of the pulley 16 is formed on the inner peripheral surface of the annular portion 70 of the stopper 17.

  In the above operation device 10, the amount of rotation (the number of rotations) of the shaft 14 and the pulley 16 can be regulated using the stopper 17. For example, the function will be described assuming that the lead groove 64 in the pulley 16 has a right-handed slope. When the shaft 14 is rotated to the right, the rotational force is transmitted through the torsion spring 15 and the pulley 16 is also rotated to the right. Since the stopper 17 is restricted from moving in the rotational direction of the pulley 16 by the engagement relationship between the guide protrusion 71 and the stopper guide hole 34, the lead groove engaging portion 72 is engaged when the pulley 16 rotates clockwise. According to the inclined shape of the lead groove 64 (the lead groove engaging portion 72 relatively moves in the lead groove 64), the lead groove 64 is guided upward by the guide hole 34 and moved upward (in the direction approaching the brake case 12). When the stopper 17 reaches the position of FIG. 4 where the guide protrusion 71 contacts the upper end of the stopper guide hole 34, the movement of the stopper 17 is restricted. Then, the further engagement of the lead groove engaging portion 72 and the lead groove 64 of the stopped stopper 17 prevents further rotation of the pulley 16 in the right direction. Is restricted. On the contrary, when the shaft 14 is rotated leftward, the stopper 17 is moved downward (from the brake case 12) according to the inclined shape of the lead groove 64 (the lead groove engaging portion 72 moves relatively in the lead groove 64). In the direction of leaving). When the stopper 17 reaches the position of FIG. 5 where the guide protrusion 71 contacts the lower end of the stopper guide hole 34, the movement of the stopper 17 is restricted, and the lead groove engaging portion 72 and the lead groove 64 are engaged via the engaging portion. The pulley 16 and the shaft 14 are prevented from turning leftward.

  As described above, according to the operating device of the present embodiment, the maximum number of rotations (the amount of rotation) of the pulley 16 and the shaft 14 can be regulated with a simple and inexpensive configuration. That is, the amount of rotation of the pulley 16 and the shaft 14 is regulated by the engagement relationship between the lead groove 64 for winding the cable 18 and the stopper 17 (more specifically, the screw engagement relationship between the lead groove 64 and the lead groove engaging portion 72). Therefore, the rotation amount control mechanism can be obtained with a small number of parts, and the manufacturing cost can be suppressed. The stopper 17 is housed in the pulley drum 30, and the stopper guide hole 34 formed on the peripheral surface of the pulley drum 30 guides the movement of the stopper 17, and therefore the structure of the rotation amount control mechanism. Is summarized in a compact. According to the operation device of the present embodiment, the rotation amounts of the shaft 14 and the pulley 16 are not restricted to one rotation or less, the diameter size of the pulley 16, the inclination angle of the lead groove 64 formed in the pulley 16, the pulley case 13. By appropriately adjusting each condition such as the length of the stopper guide hole 34 formed on the shaft, the rotation amount of the shaft 14 and the pulley 16 and the pulling amount of the cable 18 can be set with a high degree of freedom.

  6 and 7 show different (second) embodiments of the operating device to which the present invention is applied. It should be noted that the portions not shown in FIGS. 6 and 7 have the same structure as the embodiment of FIGS. 1 to 5. As shown in FIG. 6, the stopper 170 includes four cable pressing protrusions 172 extending from the annular portion 70 in the axial direction of the pulley 16. Four cable pressing ridges 136 are formed on the inner peripheral surface of the pulley case 113 so that the circumferential positions of the four cable pressing protrusions 172 are different (so as to be staggered). As shown in FIG. 7, the cable pressing protrusion 172 and the cable pressing protrusion 136 are respectively positioned outside the cable 18 wound on the lead groove 64 of the pulley 16 to prevent the cable 18 from being bent. Like the stopper 17 of the previous embodiment, the stopper 170 is moved in the axial direction of the pulley 16 by the engagement relationship between the guide protrusion 71 and the stopper guide hole 34. 172 and at least one of the cable pressing protrusions 136 are positioned outside the cable 18 wound on the lead groove 64, and always prevent the cable 18 from being bent regardless of the forward / backward movement position of the stopper 170. can do. The cable pressing protrusion 172 and the cable pressing protrusion 136 are provided at different positions in the circumferential direction. However, in order to make the function easy to understand, the cable pressing protrusion 172 and the cable pressing protrusion 136 are shown in the same cross-sectional position in FIG. (Circumferential position).

  In the first embodiment described above, the advancing / retreating movement of the stopper 17 in the axial direction of the pulley 16 is restricted by the contact relationship between the end of the stopper guide hole 34 and the guide projection 71. In the second embodiment as well, the forward and backward movement of the stopper 170 in the axial direction of the pulley 16 can be restricted in the same manner, but instead, the upper end portion of the cable pressing projection 172 and the flange portion 61 of the pulley 16 It is possible to restrict the axial movement of the stopper 170 by the contact relationship between the stopper 170 and the contact relationship between the lower end portion of the cable pressing protrusion 136 and the annular portion 70.

  Note that only one of the cable pressing protrusion 172 and the cable pressing protrusion 136 in the second embodiment may be provided, and the other may be omitted.

  FIG. 8 shows still another (third) embodiment of the operating device to which the present invention is applied. Although only the stopper 270 and the pulley case 13 are illustrated in FIG. 8, the portions not illustrated are assumed to have a structure common to the embodiment of FIGS. 1 to 5. The stopper 270 of FIG. 8 includes a cable guide 273 that protrudes from the annular portion 70 in a hook shape. The cable 18 guided into the pulley case 13 through the cable insertion hole 35 penetratingly formed in the peripheral surface of the pulley case 13 is guided onto the lead groove 64 of the pulley 16 via the cable guide 273. More specifically, the cable guide 273 includes an axial portion projecting from the annular portion 70 in the axial direction of the pulley 16, and a rotational direction portion obtained by bending the tip portion of the axial direction portion in the rotational direction of the pulley 16. The cable 18 is inserted through the cable guide 273 so as to be hooked on a portion surrounded by the axial portion and the rotational direction portion of the cable guide 273 and the annular portion 70. According to this configuration, the stopper 270 can have a function as a guide means for the cable 18 in addition to a function as an operation amount control mechanism that regulates the rotation amount of the pulley 16.

  In the first and second embodiments, by engaging the lead groove engaging portion 72 provided on the inner peripheral surface of the annular portion 70 with the lead groove 64, the pulley 16 rotates with respect to the stoppers 17 and 170. Thus, it is configured to give a moving component force in the axial direction of the rotating shaft. Also in the third embodiment, a lead groove engaging portion 72 (not shown in FIG. 8) is provided on the inner surface of the annular portion 70 of the stopper 270 and engaged with the lead groove 64, so that the stopper 270 On the other hand, it is possible to apply a moving force in the axial direction of the rotation shaft, but in this embodiment, the lead groove engaging portion 72 can be omitted. That is, since the lead groove 64 is a spiral groove, the winding start position and the feeding position of the cable 18 with respect to the pulley 16 change in the axial direction according to the rotation of the pulley 16. Along with the change in the winding position of the cable 18, axial movement force is transmitted to the cable guide 273, and the stopper 270 is moved in the axial direction of the pulley 16. When the stopper 270 reaches the moving end in the axial direction, the position of the cable guide 273 is fixed. Therefore, the position change of the cable 18 with respect to the lead groove 64 (when the cable 18 is wound, further winding, When the machine is extended, further supply) is restricted, and as a result, the rotation of the pulley 16 is restricted.

It is a perspective view which decomposes | disassembles and shows the component in one Embodiment of the operating device to which this invention is applied. It is a top view in the assembly state of the operating device of FIG. FIG. 3 is a cross-sectional view of the operating device along the line AA in FIG. 2. It is sectional drawing of the state in which the stopper was moved to the upward movement end of a stopper guide hole, and the rotation of the pulley and the shaft was controlled. It is sectional drawing of the state in which the stopper was moved to the downward movement end of a stopper guide hole, and rotation of a pulley and a shaft was controlled. It is a disassembled perspective view of the stopper and pulley case in 2nd Embodiment of the operating device to which this invention is applied. It is sectional drawing which showed the operating device of 2nd Embodiment in the axial direction cross section of the pulley. It is a disassembled perspective view of the stopper and pulley case in 3rd Embodiment of the operating device to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Operation apparatus 12 Brake case 13 113 213 Pulley case 14 Shaft 15 Torsion spring 16 Pulley 17 170 270 Stopper 18 Cable (cord-like body)
20 Brake drum 30 Pulley drum 34 Stopper guide hole (movement restricting means)
70 Annular portion 71 Guide protrusion 72 Lead groove engaging portion 136 Cable pressing protrusion 172 Cable pressing protrusion 273 Cable guide

Claims (4)

An operating device that winds and unwinds a cord connected to a driven member by forward and reverse rotation of a rotating shaft,
A pulley having a helical lead groove inclined on the axial direction of the pivot shaft on the outer peripheral surface, and winding and feeding the cord-like body along the lead groove by forward and reverse rotation given by the pivot shaft And a stopper mechanism that regulates the winding amount and feeding amount of the cord-like body around the pulley,
A stopper member that moves forward and backward in the axial direction of the rotating shaft on the lead groove of the pulley in a state where the rotation of the rotating shaft is restricted in the rotating direction of the rotating shaft when the pulley rotates forward and backward;
An operation device comprising a movement restricting means for determining an advancing / retreating end of the stopper member. The operation device according to claim 1, further comprising a cylindrical pulley case that houses the pulley, wherein the stopper member is supported in a guide hole formed in a peripheral surface of the pulley case so as to be movable in the axial direction of the rotation shaft. The operation device is characterized in that the advancing and retreating movement of the stopper member is restricted by contacting the end of the guide hole. 3. The operating device according to claim 1, further comprising a cylindrical pulley case that houses the pulley, wherein the stopper member includes an annular portion along an inner peripheral surface of the pulley case, and an axis of a rotation shaft extending from the annular portion. And a cord-shaped body pressing portion extending in the direction,
On the inner peripheral surface of the pulley case, it has a cord-like pressing ridge provided in a different position in the circumferential direction from the cord-like pressing portion of the stopper member,
An operating device characterized in that the cord-like member wound around the lead groove of the pulley is prevented from being bent by the cord-like member pressing portion and the cord-like member pressing protrusion. 4. The operating device according to claim 1, wherein the stopper member has a cable-shaped guide part through which the cable-shaped object is inserted, and the pulley is disposed on the lead groove of the pulley through the cable-shaped guide part. 5. An operating device characterized by being moved forward and backward.

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