JPH068756Y2 - Armrest lock mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of an armrest lock mechanism pivotally supported so as to be housed in and retracted from a seat back side or the like.

[Conventional technology]

For example, armrests are provided as armrests in many seats installed in the passenger compartments of various vehicles. That is, this type of armrest is rotatably supported on the side portion of the seat back, etc., and is pivoted to the seat back side when not needed to be housed in substantially the same space as the seat back surface. Only the seat is pulled out to the front of the seat according to the physique and preference of the seated person and used as an armrest. A vehicle seat 2 provided with such an armrest 1 is shown in FIG.
Is a seat cushion, and 4 is a seat back which is erected at a rear end of the seat back so as to be tiltable via a reclining mechanism 5 and the like. The armrests 1, 1
Is supported so that it can be stored and pulled out.

[Problems to be solved by the device]

By the way, in the vehicle seat 2 including the armrest 1 as described above, the armrests 1, 1 are configured to be constantly urged in the storage direction by a return spring such as a coil spring to maintain the storage state. A lock mechanism has been conventionally known which is provided with a lock mechanism for restricting the recovery rotation of the armrest 1 against the urging force of the return spring when the drawer is pulled out, so that the pulled-out state can be maintained. .

However, in such a conventional structure, a lock pin provided on an armrest or a hinge bracket pivotally supporting the armrest 1 is selectively engaged as a lock mechanism for restricting the armrest 1 in the pulled-out state against the urging force of the return spring. Specially uses a lock mechanism with a spring lock mechanism to stop, and has practical problems such as a large number of components, a complicated configuration, complicated assembly work, and high cost Therefore, it is desired to take some measures capable of solving such a problem.

[Means for Solving the Problems]

In order to meet such a demand, the lock mechanism of the armrest according to the present invention includes an armrest pivotally supported in a retractable and retractable state in an armrest hinge bracket and a retractable armrest in a retractable direction. A return spring wound around the pivot so as to always urge it, a lock pin that is erected parallel to the pivot on either side of the hinge bracket or armrest, and the other. A guide groove is formed on the member side so that the lock pin is engaged, and has a circular arc-shaped guide groove corresponding to the movement path of the lock pin when the armrest is rotated, and part of the return spring is pulled out in the guide groove. At this time, the lock portion is bent to be engaged with the lock pin so as to face the position for restricting the restoration rotation.

[Action]

According to the present invention, the armrest is normally urged in the storing direction by the urging force of the return spring wound on the pivot shaft to be held in the storing position, and is kept in the guide groove when pulled out. The moving lock pin rides over the lock part that is bent in a part of the return spring and reaches the withdrawal position, and this locking part restricts the rotation in the storage direction, and holds the armrest in the withdrawn state. is there.

[Embodiment] Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

1 to 3 show an embodiment of a lock mechanism for an armrest according to the present invention. In these figures, the same or corresponding parts as in FIG. Omit it.

According to the present invention, the armrest 1 is attached to the seat back frame side (not shown) by the pivot shaft 6.
Armrest hinge bracket 10 for pivotally supporting the armrest 1 in a retractable and retractable state, and a return spring formed by a coil spring or the like wound around the pivot shaft 9 so as to constantly bias the armrest 1 in the accommodating direction. 11, a hinge bracket 10 and a lock pin 12 which is erected parallel to either side of the armrest 10 or, in the present embodiment, a side portion of the armrest 10 in parallel with the pivot shaft 6 in an eccentric position.
On the other member side, in this embodiment, the hinge bracket 10 is provided with the lock pin 12 so as to be engaged with the guide groove 13 having an arc shape corresponding to the moving path of the lock pin 12 when the armrest 1 rotates. Therefore, a part of the return spring 11, in this embodiment, the lock pin 12 is engaged with the armrest 1 in the guide groove 13 at the other end on the side opposite to the working end 11a for applying a biasing force to the armrest 1 in the storage direction. It is characterized in that the lock portion 12 is formed to be bent in a substantially V shape so as to face the position that engages with the lock pin 12 at the time of pulling it out and restricts its recovery rotation.

Reference numeral 15 in the drawing denotes a holding portion for holding the other end side of the return spring 11 on the hinge bracket 10 so that the lock portion 14 serving as a pin stopper faces a predetermined portion of the guide groove 13.

According to such a configuration, the armrest 1 includes the pivot shaft 6
By the urging force of the return spring 11 wound upward, the urging force is normally urged in the storage direction to be held in the storage position as is clear from FIG. 2, and moves in the guide groove 13 when pulled out. As shown in FIG. 3, the lock pin 12 gets over the lock portion 14 formed by bending on the other end side of the return spring 11 and reaches the withdrawal position, and the lock portion 14 restricts the rotation in the storing direction. ,
The armrest 1 is held in the pulled-out position.

With such a configuration, despite the simple configuration, the return spring 11 also has a lock mechanism when the armrest 1 is pulled out, so that the armrest 1 can be stored and pulled out with the minimum necessary number of parts. Since it can be held, it is easy to assemble and the like, and it is possible to achieve various excellent effects in practical use such as cost reduction.

It should be noted that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part can be appropriately modified and changed as necessary. For example, in the above-described embodiment, the armrest 1 side is locked. The hinge bracket 1 is provided with an arcuate guide groove 13 into which the pin 12 is projected and which is engaged.
Although the case where it is provided on the 0 side is shown as an example, the configuration may be reversed. Further, in the above-described embodiment, the other end of the return spring 11 is bent in a substantially V shape to form the lock portion 14, but the present invention is not limited to this, and other than the urging force acting end to the lock pin 12. Any position may be used as long as it is a portion. Further, it is needless to say that the present invention can be applied to other than the vehicle seat as in the above-described embodiment to exert its effect.

[Effect of device]

As described above, according to the armrest locking mechanism of the present invention, the armrest hinge bracket is pivotally supported in the retractable state by the pivot shaft, and the armrest is always biased in the retracting direction. A return spring wound around the pivot, a hinge bracket,
A lock pin that is erected parallel to one side of the armrest at a position eccentric to the pivot shaft and a lock pin that is formed so that the lock pin is engaged with the other member side. It has a circular arc-shaped guide groove, and a part of the return spring is bent and formed so as to engage with the lock pin when the armrest is pulled out in the guide groove and face the position that regulates its recovery rotation. Since it was made a part, despite the simple configuration,
The return spring also has a lock mechanism when the armrest is pulled out so that the armrest can be stored and pulled out with the minimum required number of parts.Assembly work is easy and the cost is low. There are various practically excellent effects such as the ability to do so.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a main part configuration showing an embodiment of a lock mechanism of an armrest according to the present invention, FIG. 2 and FIG.
FIG. 4 is an enlarged side view of essential parts for explaining the operating state, and FIG. 4 is a schematic perspective view of a vehicle seat provided with an armrest. In the figure, 1 ... Armrest, 2 ... Vehicle seat, 4 ...
... Seat back, 6 ... Pivot axis, 10 ... Armrest hinge bracket, 11 ... Return spring, 12
...... Lock pin, 13 ...... arc guide groove, 14 ...... Lock part.

Claims (1)

[Scope of utility model registration request] 1. An armrest rotatably supported by a pivot shaft so as to be housed in and retractable from an armrest hinge bracket mounted on the seat back side, and the armrest is constantly urged in the housing direction. A return spring wound around the pivot shaft, a lock pin erected parallel to the pivot shaft on either one of the hinge bracket and the armrest at an eccentric position, and the other. A guide groove having an arc shape corresponding to the movement locus of the lock pin when the armrest is rotated is formed on the member side of the guide groove, and a part of the return spring is provided in the guide groove. The lock part is formed by bending so that it engages with the lock pin when the armrest is pulled out and faces the position that restricts its recovery rotation. Armrest of the lock mechanism, characterized.