JP4530208B2 - Armrests for vehicle seats - Google Patents

Description

  The present invention relates to an armrest in which the tip position of the armrest is displaced from the use position to the retracted position, and the tip height is arbitrarily adjustable.

2. Description of the Related Art Conventionally, it is known that an armrest is attached so as to be rotatable around a shaft in the left-right direction and the height of the armrest is adjusted using friction of a coil spring. (Patent Document 1).
JP 2003-299547 A

The known example has a problem that the base and the periphery of the armrest become large because a member having a switching groove for switching the end of the coil spring between unlocking and locking is provided around the shaft at the rotation center of the armrest. .
In the present application, the base and the periphery of the armrest are reduced in size, and the shape of the switching groove for switching between unlocking and locking is devised to ensure the operation.

In the present invention, the coil portion 31 of the lock spring 30 that locks the rotation of the armrest 4 provided on the back seat 3 of the seat 1 with frictional resistance is fitted to the outer periphery of the shaft 7 in the left-right direction, One end of the coil portion 31 is formed at a free end 35, the other end of the coil portion 31 is fixed, and the free end 35 is connected and disconnected to switch the lock spring 30 between a locked state and an unlocked state. A cam groove 38 is provided, and the switching cam groove 38 has an unlock cam surface 36 that holds the free end 35 in the unlock position, and a guide cam surface 37 that guides the engagement with the unlock cam surface 36. The unlock cam surface 36 becomes lower on the inner peripheral surface of the switching cam groove 38 on the upper rotation direction side of the armrest 4 as it goes outward with respect to the axial direction of the shaft 7. Yo Tilted formed on, the guide cam surface 37, the inner peripheral surface of the lower rotation direction side of the armrest 4 the switching cam groove 38, formed to be inclined so as to be higher in accordance leading outside, the uninstalling A clearance 41 through which the free end 35 can pass is provided between the outer end E of the locking cam surface 36 and the tip F of the guide cam surface 37, and the tip F of the guide cam surface 37 The vehicle seat armrest is configured to be positioned outside the outer end E of the locking cam surface 36 and on the upward rotation direction side of the armrest 4 .
The present invention relates to a spring mounting bracket in which a lateral shaft 7 is fixed to a back bracket 6 fixed to the side portion of the back seat 3 of the seat 1 and fixed to the outer surface of an armrest frame 13 of the armrest 4. 14 is rotatably inserted, and the coil portion 31 of the lock spring 30 is fitted to the outer periphery of the shaft 7 protruding outward from the spring mounting bracket 14, and one end of the coil portion 31 is formed at the free end 35. The other end of the coil portion 31 is formed on a fixed side end portion 33 fixed to the spring mounting bracket 14, and a bent plate portion 39 bent outward is provided on the front edge of the spring mounting bracket 14. The bent plate portion 39 guides the engagement with the unlock cam surface 36 and the unlock cam surface 36 for holding the free end 35 of the lock spring 30 in the unlock position. A switching cam groove 38 having an opening on the outside, and the unlocking cam surface 36 is formed on the inner circumferential surface of the switching cam groove 38 on the upper rotational direction side of the armrest 4. The guide cam surface 37 is inclined so as to become lower with respect to the axial direction of the shaft 7, and the guide cam surface 37 is an inner peripheral surface of the switching cam groove 38 on the downward rotation direction side of the armrest 4. In addition, the gap is formed so as to increase toward the outer side, and the free end 35 can pass through between the outer end E of the unlock cam surface 36 and the front end F of the guide cam surface 37. 41, and the distal end F of the guide cam surface 37 is located outside the outer end E of the unlocking cam surface 36 and on the upward rotation direction side of the armrest 4. and the seat of the armrest for a vehicle Those were.
In the present invention, the unlocking contact portion 47 for fitting the free end 35 to the switching cam groove 38 and the free end 35 fitted to the switching cam groove 38 are separated from the outer end of the shaft 7. The contact member 45 provided with each of the unlocking portions 50 for returning to a free state is brought into contact with the position immovable, and the distal end portion F of the guide cam surface 37 is an outer end portion of the unlocking cam surface 36. The vehicle seat armrest is configured so as to be positioned closer to the unlocking contact portion 47 on the side where the contact member 45 is provided than E.
In the present invention, the unlocking contact portion 47 for fitting the free end 35 to the switching cam groove 38 and the free end 35 fitted to the switching cam groove 38 are separated from the outer end of the shaft 7. Then, the contact member 45 provided with each of the unlocking portions 50 for returning to the free state is brought into contact with the position immobility, and the engagement protrusion 20 formed on the inner end of the shaft 7 is engaged with the back bracket 6. A vehicle seat armrest configured to engage with the hole 58 and fix the shaft 7 and the contact member 45 to the dorsal bracket 6 from the outside of the contact member 45 by a fastening member 59. It is.

In the first and second aspects of the invention, since the unlocking cam surface 36 is inclined, the engagement of the free end 35 can be ensured and the unlocked state can be reliably maintained.
In the invention of claim 3 , the free end 35 is securely and smoothly fitted (engaged) with the switching cam groove 38.
In the invention of claim 4 , positioning of the contact member 45 having the unlock contact portion 47 and the unlock release portion 50 is easy, and the shaft 7 and the contact member 45 are directly fixed to the dorsal bracket 6. Therefore, there is no position shift in the manufacturing process, the mounting accuracy is improved, and it can be firmly fixed.

An embodiment of the present invention will be described with reference to the drawings. 1 is a vehicle seat, 2 is a seat seat, 3 is a back seat provided on the seat seat 2 so that the inclination angle can be adjusted, and 4 is a side portion of the back seat 3. It is the armrest provided in.
For example, the armrest 4 is configured to lock the downward rotation of the armrest 4 in the originally used usage range A to support the load, and to allow only the upward rotation to be adjustable in height. In the storage range B that is the same as or spaced from the position, the storage range B is unlocked and can be turned up and down, and can be turned downward from the storage range B to the lowest position of the use range A. It is preferable to improve the operability by returning to the lockable state at the lower position so that only upward rotation is possible in the use range A (FIG. 1).

The armrest 4 is attached to a dorsal bracket 6 provided on the side of the dorsal skeleton frame 5 of the dorsal seat 3 so as to be rotatable up and down around a shaft 7 in the left-right direction. The shaft 7 is formed with a step portion 10 in the middle (FIG. 2), the shaft 7 on one side of the step portion 10 is formed on the large diameter portion 11, and the shaft 7 on the other side of the step portion 10 is formed on the small diameter portion 12. (FIG. 2).
A spring mounting bracket 14 is fixed to the armrest frame 13 of the armrest 4 (FIG. 2), and a cylindrical burring portion 16 protruding to one side is formed on the side plate 15 of the spring mounting bracket 14. The inner diameter of the burring portion 16 is the same as the outer diameter of the small diameter portion 12 of the shaft 7, the small diameter portion 12 is inserted into the through hole 17 of the burring portion 16, and the end surface 18 of the burring portion 16 is inserted into the end surface 18 of the shaft 7. The step 10 is brought into contact.
A plurality of engaging grooves 19 and engaging protrusions 20 are alternately formed in the circumferential direction by cutting out in the generatrix direction at the tip of the small diameter portion 12 (FIG. 3).
Each engagement protrusion 20 of the shaft 7 is inserted into each insertion hole 26 of the plate 25.

Accordingly, a projection projection 28 having a predetermined height (size) from the groove bottom surface 27 is formed on the groove bottom surface 27 at the groove bottom of the engagement groove 19. The shaft 7 inserted through the through-hole 17 of the burring portion 16 energizes the shaft 7 and the plate 25 in a state where the engagement protrusion 20 of the small diameter portion 12 of the shaft 7 is inserted into the insertion hole 26 of the plate 25, Projection welding performed by concentrating on the projection projection 28.
In this case, the projection protrusions 28 are formed on the groove bottom surface 27, the distance from the outer surface of the side plate 15 to the end surface 18 of the through hole 17 is “X” (FIG. 3), and the height of the projection protrusion 28 from the groove bottom surface 27 is set. When “Y” is set (FIG. 3) and the distance from the step portion 10 to the groove bottom surface 27 is set to “Z” (FIG. 3), “X <Z + Y” before welding, but the projection protrusion 28 is crushed during welding. Then, the height of the projection projection 28 after welding is changed to “Y ′”, and thereby, “X = Z + Y ′” is set (FIG. 6).

  Therefore, the projection projection 28 is melted and crushed during welding under an appropriate current value and other welding conditions and pressure, so that the height Y ′ of the crushed projection projection 28 and the step portion 10 of the shaft 7 and the groove bottom surface 27 are reduced. The interval Z coincides with the height X of the burring portion 16, and the plate 25 is in close contact with the side plate 15 of the spring mounting bracket 14, so that setting at the time of welding is easy. The gap between the shaft 7 and the plate 25 is made zero to prevent the shaft 7 from rattling against the spring mounting bracket 14, and as a result, the tip of the armrest 4 is prevented from swinging in the left-right direction at the use position.

Thus, the armrest 4 is provided with a locking device L between the base portion of the armrest frame 13 and the dorsal bracket 6. The locking device L has a coil portion 31 of a lock spring 30 fitted on the outer periphery of the large-diameter portion 11 of the shaft 7, locks by friction between the coil portion 31 and the outer periphery of the large-diameter portion 11, and unlocks by releasing the friction. Thus, the tilt can be adjusted.
One end of the lock spring 30 is engaged with the stay 32 of the spring mounting bracket 14 fixed to the armrest frame 13 and formed at the fixed side end portion 33, and the other end of the lock spring 30 is formed at the free end 35, and the coil portion 31 is set to a winding direction to be tightened when the fixed-side end portion 33 rotates with the downward movement of the armrest 4, so that even if the other end is the free end 35, the armrest 4 is rotated downward. In addition, the frictional resistance between the outer periphery of the large-diameter portion 11 and the burring portion 16 of the shaft 7 and the inner periphery of the coil portion 31 acts in the direction of decreasing the diameter of the coil portion 31, and the armrest 4 is rotated downward by this frictional resistance. Prevent and lock.

The spring mounting bracket 14 includes an unlock cam surface 36 that holds the free end 35 of the lock spring 30 in the unlock position, and a guide cam surface 37 that guides the engagement with the unlock cam surface 36. The switching cam groove 38 having the above is formed.
The switching cam groove 38 is formed in the bent plate portion 39 of the spring mounting bracket 14 bent so as to be substantially parallel to the axial direction of the shaft 7.
The bent plate portion 39 is bent leftward at the front edge of the spring mounting bracket 14 in FIG. 2, and the rear edge 40 of the spring mounting bracket 14 matches the shape of the rear portion (in use) of the armrest frame 13, The shape of the armrest frame 13 on the rear side of the shaft 7 is formed as small as possible (FIG. 5).

  That is, when the shape (volume / volume) of the rear part of the armrest 4 is made smaller than the shaft 7, the space required for the mounting space, the use state and the storage state can be reduced, and the limited vehicle interior space can be used effectively. The shape of the rear edge 40 of the rear edge of the bracket 14 and the rear shape of the armrest frame 13 are relatively matched to form the rear shape of the armrest 4 as small as possible.

Therefore, the unlocking cam surface 36 is formed on the switching cam groove 38 on the upper rotational direction side (upper surface side) of the armrest 4. The unlocking cam surface 36 is formed so as to be inclined at a predetermined angle θ as it goes outward with respect to the axial direction of the shaft 7. The predetermined angle θ is preferably about 10 degrees of inclination. A guide cam surface 37 that is inclined so as to increase in the opening direction (left direction) of the switching cam groove 38 is formed on the downward rotation direction side of the switching cam groove 38.
A gap 41 through which the free end 35 can pass is provided between the outer end E of the unlocking cam surface 36 and the tip F of the guide cam surface 37.

Further, the front end portion F of the guide cam surface 37 is configured to be positioned outside and above the outer end portion E of the unlock cam surface 36.
In other words, the front end F of the guide cam surface 37 is positioned so as to overhang the outer upper end E of the unlocking cam surface 36 at the upper position on the outer side. Like to do.

Accordingly, the bent plate portion 39 on the upper side of the outer end E of the unlocking cam surface 36 is formed on the inclined surface 42 that approaches the inner side (right side) as it reaches the upper side. Even if the position of the free end 35 varies due to the inclined surface 42, contact with the bent plate portion 39 is prevented.
On the other hand, an abutting member 45 is provided at the end of the large-diameter portion 11 of the shaft 7 so that the free end 35 that moves by the rotation of the armrest 4 abuts. The abutting member 45 fixes a plate member 46 in a direction intersecting the axis of the shaft 7 to the end of the large diameter portion 11 of the shaft 7, and the free end 35 is fitted into the switching cam groove 38 on the plate member 46. An unlocking contact portion 47 to be engaged (engaged) is provided. The locked free end 35 abuts on the unlocking contact portion 47, and the free end 35 whose upward rotation has been stopped by the unlocking contact portion 47 is guided by the guide cam surface 37 to the switching cam groove 38. Mating.

As a result, the free end 35 engages with the unlocking cam surface 36, and the coil portion 31 of the lock spring 30 is loosened and held in the unlocked state.
The inner end G of the unlocking contact portion 47 is positioned inside the outer end E of the unlocking cam surface 36, and the free end 35 guides to the inner end G of the unlocking contact portion 47. When guided and moved by the cam surface 37, the free end 35 is disengaged from the unlocking contact portion 47 and fits into the switching cam groove 38, and the unlocking cam surface is caused by the elasticity of the free end 35 itself as described above. 36 abuts.
Further, the peripheral edge on the rear side from the inner end G of the unlocking contact portion 47 of the plate member 46 is formed on the unlock holding surface 48. The unlock holding surface 48 is located at the same position as the inner end G of the unlocking contact portion 47 in plan view, and prevents the free end 35 contacting the unlocking cam surface 36 from coming off the switching cam groove 38. Expect action.

  Accordingly, the front end portion of the plate member 46 is unlocked by releasing the free end 35 engaged with the unlocking cam surface 36 of the switching cam groove 38 from the unlocking cam surface 36 to return to the free state. A release unit 50 is provided. The unlocking portion 50 is formed by a bent portion 51 in which the front end portion of the plate member 46 is bent toward the spring mounting bracket 14, and the upper surface side of the bent portion 51 becomes lower and lower (upward rotation) from the tip to the base portion. An inclination release surface 52 that is inclined in the direction of the movement direction is formed, and the tip end portion H of the inclination release surface 52 is positioned so as to be inside the outer end E of the unlock cam surface 36. And the contact member 45 move relative to each other, so that the free end 35 is guided by the inclination release surface 52 of the unlock release portion 50 and separated from the unlock cam surface 36 (switching cam groove 38). The locked state is switched to the lockable state.

Accordingly, an engagement hole 56 is formed in the plate member 46 of the contact member 45, and an engagement protrusion 57 formed on the outer end portion of the large diameter portion 11 of the shaft 7 is engaged with the engagement hole 56. Fix the mounting position. In this state, the engagement protrusions 20 of the shaft 7 projecting inward from the plate holes 25 and the respective insertion holes 26 of the plate 25 are projected from the window holes 60 of the armrest frame 13, and each engagement protrusion 20 is engaged with the back bracket 6. The shaft 7 is fixed to the back bracket 6 by engaging with the joint hole 58 and by a fastening member 59 such as a bolt from the outside of the contact member 45.
Therefore, the shaft 7 and the plate 25 are fixed to the back bracket 6, and the spring mounting bracket 14 fixed to the armrest frame 13 becomes a moving side member with respect to the shaft 7, and this spring mounting bracket 14 (armrest frame 13 ) Is engaged with the fixed-side end portion 33 of the lock spring 30.

  Therefore, the fixed-side end portion 33 of the lock spring 30 rotates about the shaft 7 as the armrest 4 rotates. However, for the sake of easy understanding, the fixed-side end portion 33 is “fixed” with respect to the free end 35 of the lock spring 30. Although expressed, the configuration is not limited by these expressions.

(Operation of Example)
The armrest 4 is in a use state within a use range A including a substantially horizontal position. In the use range A, once the armrest 4 is pivoted downward to a lowermost position about the shaft 7, the lock device L is in an activated state, and the armrest 4 is turned upward. Can move, but locks downward rotation to support the load.
Therefore, the armrest 4 is once rotated downward to the lowest position in the use range A, and then the armrest 4 is rotated upward as necessary to adjust the height of the armrest 4.
Next, when the armrest 4 is rotated upward to the uppermost position of the use range A, this position is the upper limit position that locks the downward rotation of the armrest 4 and supports the load. The range is B, and the storage range B is unlocked in any direction.

Thus, in order to change to the use state from the storage position, the armrest 4 may be rotated downward to the lowest position of the use range A as described above, and the lock device L may be activated. The operation (operation) is repeated.
Thus, the operation of the locking device L will be specifically described. The base portion of the shaft 7 in the left-right direction is fixed to the back bracket 6, and the coil portion 31 of the lock spring 30 is fitted on the outer periphery of the large-diameter portion 11 of the shaft 7. Then, one end of the lock spring 30 is engaged with a stay 32 provided on the spring mounting bracket 14, the other end of the lock spring 30 is formed at the free end 35, and the coil portion 31 is moved with the downward rotation of the armrest 4. Since the winding direction is set so that it is tightened when the fixed-side end portion 33 is rotated, when the armrest 4 is rotated downward in the use range A, the spring mounting bracket 14 is rotated downward together with the armrest 4. Thus, the fixed-side end portion 33 is rotationally moved, whereby a frictional resistance is generated between the inner periphery of the coil portion 31 and the outer periphery of the large-diameter portion 11 of the shaft 7. The diameter of the coil portion 31 acts to the small, to lock to prevent downward rotation of the armrest 4 in this resistor.

Therefore, the load applied to the armrest 4 is locked by restricting the downward rotation, but when the armrest 4 is rotated upward, the coil portion 31 is in a loose winding direction and the height can be adjusted freely.
Thus, when the armrest 4 is rotated upward to the uppermost position in the use range A, the free end 35 rotates together with the armrest 4, and the free end 35 unlocks the plate member 46 of the contact member 45 fixed to the shaft 7. It abuts on the abutment portion 47 (FIG. 12), and the unlock abutment portion 47 stops the movement of the free end 35.
The free end 35 whose movement is stopped by the unlocking contact portion 47 contacts the guide cam surface 37 of the spring mounting bracket 14 (FIG. 14).
In this case, the front end portion F of the guide cam surface 37 is positioned so as to overhang outside and above the outer end E of the unlocking cam surface 36, so that the guide cam surface 37 is free. Guide to the end 35 securely.

Thus, the free end 35 pushed by the guide cam surface 37 moves laterally toward the inner end G along the edge of the unlocking contact portion 47 (reference to the shaft 7), and the free end 35 is unlocked. When it moves to the inner end G of the contact portion 47, the contact portion 47 is released from the unlock contact portion 47.
Since the inner end G of the unlocking contact portion 47 is located on the inner side of the distal end portion F of the guide cam surface 37, the free end 35 deviated from the inner end G of the unlocking contact portion 47 is: It fits in the switching cam groove 38 and moves vertically in the circumferential direction of the shaft 7 toward the unlocking cam surface 36 by the elasticity of the free end 35 itself (FIG. 16).
When the free end 35 is fitted in the switching cam groove 38, the free end 35 moves together with the switching cam groove 38 of the spring mounting bracket 14, and the fixed side end 33 of the lock spring 30 together with the stay 32 of the spring mounting bracket 14. Since the rotational relationship is such that the positional relationship between the free end 35 and the fixed side end 33 does not change, the diameter of the coil portion 31 does not change, the locking device L is unlocked, and the armrest 4 can be moved in any direction up or down. It can rotate freely (of course, it can freely rotate upward).

In this case, the unlocking cam surface 36 is formed so as to be inclined at a predetermined angle θ lower (about 10 degrees with respect to the shaft center of the shaft 7) as it goes outward with respect to the shaft center direction of the shaft 7. The end 35 reliably engages with the unlocking cam surface 36 and prevents lateral movement unless it abuts on an unlocking portion 50 of the abutting member 45 described later, thereby preventing it from coming off the switching cam groove 38. Hold the unlocked state.
Therefore, the position where the free end 35 is fitted in the switching cam groove 38 is set to the upper limit position of the use range A where the armrest 4 is originally used as the armrest 4, and therefore the storage range B beyond the use range A. As a result, the free end 35 is always engaged with the switching cam groove 38 to be unlocked.
Further, the rear peripheral edge of the unlocking contact portion 47 of the plate member 46 is formed on the unlock holding surface 48 that is flush with the inner end portion G of the unlocking contact portion 47. If the contact portion 47 is arranged so that the armrest 4 is positioned between the upper limit position of the use range A and the storage range B, the armrest 4 is unlocked without moving up to the upper limit of the storage range B. The armrest 4 can be rotated downward, and the operability is not deteriorated while expanding the rotation range of the armrest 4.

Thus, the contact member 45 is provided with the unlock release portion 50 for releasing the free end 35 fitted in the switching cam groove 38 and returning it to the free state, so that the lock device L is once unlocked. Then, when the armrest 4 is rotated downward to the lowest position of the use range A, the free end 35 hits the tilt release surface 52 of the unlock release portion 50 (FIG. 11), and the armrest 4 is further rotated downward. The descending free end 35 is guided outward by the tilt release surface 52, moves the unlocking cam surface 36 toward the outer end E in the lateral direction (the axial direction of the shaft 7), and the unlocking cam surface 36. After passing the outer end E, the free end 35 is released from the switching cam groove 38 through the gap 41 by the elasticity of the free end 35 (FIG. 10).
When the free end 35 is disengaged from the switching cam groove 38, as described above, the position of the free end 35 with respect to the fixed-side end portion 33 can be changed, the lock device L is activated, and the armrest 4 is rotated downward. Lock it.

In this case, the free end 35 is not only elastically deformed by the movement of the coil portion 31 in the circumferential direction, but is also elastically deformed in the lateral direction which is the axial direction of the shaft 7, so that the switching cam groove 38 is unlocked. Even if the circumferential movement is stopped due to contact with the cam surface 36, the movement may occur in the lateral direction (axial direction) and disengage from the switching cam groove 38. 36 is formed so as to be inclined approximately 10 degrees lower toward the outer side with respect to the axial direction of the shaft 7, so that the unlocking cam surface 36 itself is inclined to the unlock release portion 50 of the contact member 45. As long as the free end 35 does not contact, the lateral movement of the free end 35 can be prevented, and the free end 35 is prevented from coming off from the switching cam groove 38, so that the unlocked state is reliably maintained.
As described above, the configuration in which the free end 35 is connected to and detached from the switching cam groove 38 is only required to provide the shape of the switching cam groove 38 and the contact member 45 that contacts the free end 35, so that the operation is reliable and inexpensive. Can be.

Further, the setting of the use range A and the storage range B can be changed only by exchanging the contact member 45 whose position (distance) between the unlock contact portion 47 and the inclination release surface 52 is changed.
In this case, an engagement hole 56 is formed in the plate member 46 of the contact member 45, and an engagement protrusion 57 formed on the outer end portion of the large-diameter portion 11 of the shaft 7 is engaged with the engagement hole 56. Next, the engagement protrusions 20 of the shaft 7 protruding inward from the respective insertion holes 26 of the plate 25 are engaged with the engagement holes 58 of the dorsal bracket 6, and bolts are formed from the outside of the contact member 45. Since the shaft 7 is fixed to the dorsal bracket 6 by the fastening member 59 such as the shaft 7, the shaft 7 and the contact member 45 are firmly fixed to the dorsal bracket 6.
Therefore, positioning of the contact member 45 having the unlock contact portion 47 and the unlock release portion 50 is facilitated, and the setting accuracy of the use range A and the storage range B of the armrest 4 is improved. Further, since the shaft 7 and the abutting member 45 are directly fixed to the dorsal bracket 6, there is no positional shift in the manufacturing process and it can be firmly fixed.
Further, since the shaft 7 and the abutting member 45 are fixed by the fastening member 59, the shaft 7 and the contact member 45 can be directly fixed to the dorsal bracket 6 without using a means such as welding, so that the attachment becomes easy.

The side view of a sheet | seat. The disassembled perspective view of a locking device. Exploded view of shaft, bracket and plate. The exploded perspective view. The same side view. The bottom view. The partially broken view of a shaft. Sectional drawing of the fixed state of a shaft, a bracket, and a plate. The positional relationship explanatory drawing of a cam groove and a contact member. The front view of a lockable state. The same side view. The front view of an unlock holding | maintenance transfer start state. The same side view. The front view of an unlock holding | maintenance transfer state. The front view. Unlock holding state diagram (between front and plane). FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Seat, 2 ... Seat seat, 3 ... Dorsal seat, 4 ... Armrest, 5 ... Dorsal skeleton frame, 6 ... Dorsal bracket, 7 ... Shaft, 10 ... Step part, 11 ... Large diameter part, 12 ... Small diameter , 13 ... armrest frame, 14 ... spring mounting bracket, 15 ... side plate, 16 ... burring part, 17 ... through hole, 18 ... end face, 19 ... engagement groove, 20 ... engagement protrusion, 25 ... plate, 26 ... Insertion hole, 27 ... groove bottom, 28 ... projection projection, 30 ... lock spring, 31 ... coil part, 32 ... stay, 33 ... fixed side end, 35 ... free end, 36 ... unlocking cam face, 37 ... guide Cam surface, 38 ... switching cam groove, 39 ... bent plate portion, 40 ... trailing edge, 41 ... gap, 45 ... contact member, 46 ... plate member, 47 ... contact portion for unlocking, 48 ... unlock holding surface 50 ... Unlock release part, 5 ... inclined release surface, 56 ... engaging hole, 57 ... engaging projection, 58 ... engaging hole, 59 ... fastening member.

Claims (4)

A coil portion 31 of a lock spring 30 that locks the rotation of an armrest 4 provided on the dorsal seat 3 of the seat 1 with frictional resistance is fitted to the outer periphery of the shaft 7 in the left-right direction. One end of the coil portion 31 is formed in a free end 35, and the other end of the coil portion 31 is fixed, and a switching cam groove 38 for switching the lock spring 30 between a locked state and an unlocked state by the free end 35 being connected and disconnected. The switching cam groove 38 is provided with an unlocking cam surface 36 that holds the free end 35 in the unlocked position, and a guide cam surface 37 that guides the engagement with the unlocking cam surface 36. The unlocking cam surface 36 is inclined on the inner peripheral surface of the switching cam groove 38 on the upper rotation direction side of the armrest 4 so as to become lower toward the outer side with respect to the axial direction of the shaft 7. Forming Te, the guide cam surface 37, the inner peripheral surface of the lower rotation direction side of the armrest 4 the switching cam groove 38, formed to be inclined so as to be higher in accordance leading outwardly, the unlocking cam A clearance 41 through which the free end 35 can pass is provided between the outer end E of the surface 36 and the front end F of the guide cam surface 37, and the front end F of the guide cam surface 37 is formed by the unlock cam. An armrest for a vehicle seat configured to be positioned on the outer side of the outer end E of the surface 36 and on the upper rotation direction side of the armrest 4 . A horizontal shaft 7 is fixed to a fixed back bracket 6 on the side of the back seat 3 of the seat 1, and a spring mounting bracket 14 fixed to the outer surface of the armrest frame 13 of the armrest 4 is freely rotatable on the shaft 7. The coil portion 31 of the lock spring 30 is fitted to the outer periphery of the shaft 7 protruding outward from the spring mounting bracket 14, and one end of the coil portion 31 is formed at the free end 35, and the coil portion The other end of 31 is formed at a fixed side end 33 fixed to the spring mounting bracket 14, and a bent plate portion 39 bent outward is provided at the front edge of the spring mounting bracket 14. 39, an unlock cam surface 36 that holds the free end 35 of the lock spring 30 in the unlock position, and a guide cam that guides the engagement with the unlock cam surface 36. A switching cam groove 38 having a surface 37 and an outer opening is formed, and the unlocking cam surface 36 is formed on the inner peripheral surface of the switching cam groove 38 on the upper rotation direction side of the armrest 4. The guide cam surface 37 is formed on the inner peripheral surface of the switching cam groove 38 on the side of the downward rotation direction of the armrest 4 on the outer side. And a clearance 41 through which the free end 35 can pass is provided between the outer end E of the unlocking cam surface 36 and the front end F of the guide cam surface 37. At the same time, the front end F of the guide cam surface 37 is positioned outside the outer end E of the unlock cam surface 36 and on the upward rotation direction side of the armrest 4 . Seat armrest. 3. The unlocking contact portion 47 for fitting the free end 35 into the switching cam groove 38 and the switching cam groove 38 at the outer end of the shaft 7 according to claim 1 or 2. The contact member 45 provided with each of the unlocking release portions 50 for releasing the end 35 and returning to the free state is brought into contact with the position immovable, and the distal end portion F of the guide cam surface 37 is formed by the unlock cam surface. An armrest for a vehicle seat configured to be positioned closer to the unlocking contact portion 47 on the side where the contact member 45 is provided than the outer end E of 36. 4. The unlocking contact portion 47 for fitting the free end 35 into the switching cam groove 38 and the switching cam groove 38 at the outer end of the shaft 7 according to claim 1 or claim 2 or claim 3. The engaging protrusions 20 formed on the inner end of the shaft 7 are brought into abutment with the abutting members 45 provided with the unlocking portions 50 for releasing the free end 35 and returning to the free state. Is engaged with the engagement hole 58 of the dorsal bracket 6, and the shaft 7 and the abutting member 45 are fixed to the dorsal bracket 6 by the fastening member 59 from the outside of the abutting member 45. Armrests for used vehicle seats.

Images