JPH0227807Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a vertical adjustment device for a headrest in an automobile seat.

(Prior art and its problems) Conventionally, the height (upper and lower limits) of this type of headrest has been regulated to be constant for safety reasons. Therefore, in order to prevent the pillar from lowering beyond a certain level (lower limit), it is necessary to provide a stopper mechanism in which the lower end of the pillar abuts against the frame within the seat, making the internal structure of the seat complicated. In particular, in the case of front seat backs, which have a concave shape on the back surface inward so that rear seat occupants can freely move their knees, and the upper part of the seat, which is the pillar attachment part, protrudes toward the rear seat side, when the pillar is lowered, the lower end There was a problem in that the structure had to be designed so that the part did not come close to the back of the seat bag.

In addition, in order to restrict the headrest from rising above a certain level (upper limit), a notch to prevent the headrest from falling out is provided below the recessed part for adjusting the height of the lowest stage. The lock pin that engages with the lock prevents the pillar from coming off and limits the upper limit of the headrest. However, even if the lock pin engages with the notch that prevents the pillar from coming off, the operation knob for releasing the lock will still be pressed. If the operation was continued, the lock pin would be disengaged and move above the predetermined position (upper limit), resulting in a problem that the headrest could not be quickly fixed at the predetermined position.

On the other hand, models that do not have an operation knob for unlocking (for example, Utility Model Publication No. 47-31543) do not have the above-mentioned problem, but the leaf springs have a notch for vertical adjustment of the pillar and a notch for preventing the headrest from being pulled out. This plate spring is curved in an S-shape and arranged at the lower part of the support tube through which the pillar is inserted. Therefore, a device without an operating knob for releasing the lock has the disadvantage that the plate spring protrudes from the lower part of the support cylinder, making assembly difficult. That is, in order to ensure that the support tube can be attached to the seat bag reliably and easily, it is desirable to fit it into a bracket that is fixed to the frame by welding, but since the leaf spring protrudes from the support tube, it is impossible to fit it into the bracket. First, the support tube must be fixed to the frame. Therefore, a support cylinder with a leaf spring has poor assembly efficiency, cannot reliably support the pillar of the headrest, and furthermore, the leaf spring does not engage the pillar at right angles to the axial direction of the pillar. Therefore, the locking reliability is low, and a strong leaf spring must be used to ensure the locking, but if such a leaf spring is used, there is a drawback that the operability of the headrest becomes poor. Furthermore, devices that do not use this unlocking operation means have the disadvantage that the headrest must be moved up and down against the elasticity of the leaf spring, and a considerable amount of operating force is required to adjust the headrest up and down.

(Technical problem to be solved by the invention) The technical problem of the present invention to solve the above problems is to make the headrest vertical adjustment device excellent in assembly and operability, and to ensure that it is locked. It is to do so.

(Technical Means for Achieving the Technical Problem) The technical means of the present invention for achieving the above-mentioned technical problem is to provide a large number of recessed notches on one side with at least a substantially horizontal upper side for height adjustment. , a pillar having a substantially horizontal cutout on the upper side for regulating the lower limit movement on the other side; a support cylinder fixed to the seat bag and into which the pillar of the headrest is inserted; a collar-shaped fixing part on the upper end edge of the support cylinder; an operation knob having a horizontally extending rigid support member that is slidably mounted in the axial direction and orthogonal directions; At least one lock pin is supported horizontally movably by the first lock pin and the rigid support member and is provided so as to be able to move in and out of the notch for regulating the lower limit movement of the pillar, and urges the first and second lock pins in the direction of the pillar, respectively. It is to have a spring of.

(Example) Examples of the present invention will be described below based on the drawings.

FIGS. 1 to 6 show an embodiment of the present invention, in which a represents the seat back of the front seat A, and B represents the rear seat (FIG. 1). A' is a seat bag frame provided inside the seat bag a, and the upper part of the frame is bent rearward. a1 is a knee accommodating space for a rear seat occupant X formed in a concave shape on the back surface of the seat back a (rear seat B side), b is a headrest that is vertically adjustable, and b' is a pillar of the headrest b. Pillar b' is a flat metal rod, with a large number of height-adjusting recesses 2, 2, etc. arranged in multiple stages along the end face of one side in the axial direction, and movement control at the upper and lower parts of the opposite side. Notches 10 and 11 for movement restriction are provided, and a notch 10 for movement restriction located on the upper part is provided.
is defined as a downward restraining notch, and the movement regulating notch 11 located at the bottom is defined as a rising restraining notch. The lowering stop notch 10 is provided at a higher position than the height adjustment recess 2 at the top, and its upper side is perpendicular or acute to the axial direction of the pillar b'. The lower side is formed in an inclined shape, so that when a second lock pin 33, which will be described later, engages with this notch 10, the pillar b' will not descend any further. Further, the rise restraining notch 11 is provided at a lower position than the lowest height adjustment notch 2, and its shape is such that the upper side is inclined and the lower side is approximately horizontal with respect to the axial direction of the pillar b'. The second lock pin 3 is formed in the shape of a right angle or an acute angle, and the second lock pin 3 is formed in the recessed part 11.
3 engages, further elevation of pillar b' is restricted.

The pillar b' is inserted into the support cylinder c so as to be vertically movable, and locking mechanisms 30, 31, 32, which will be described later,
Its vertical movement is regulated by... and maintained at a predetermined height. Said seat back frame
The support tube c fitted into the bracket d fixed to the upper part of a' and the back cross plate e includes a guide tube c1 integrally molded from hard synthetic resin, and a fixing tube integrally molded in the shape of a thick flange on its upper edge. It consists of part c2,
The guide tube c1 has a horizontally long rectangular cross section, and has bulges c1' and c on its inner surface on which the pillar b' slides.
1' are provided in the vertical direction, and the fixing portion c2 is fastened and fixed to the top surface of the bracket d by fastening members 41, 41.

The lock mechanisms 30, 31... are the pillars of the guide cylinder c1.
b' Slide hole 3 opened on the side of the recessed part 2 for height adjustment
6. The first lock pin 32 that slides in the slide hole 36 and engages with the recessed part 2 of the pillar b';
A pair of rod-shaped rigid support members 31, 31 connected to both left and right ends of the lock pin 32 and disposed outside both outer surfaces of the guide cylinder c1 are slidably placed in the sliding groove 42 on the fixed part c2. An operating knob 30 for unlocking is connected to the free ends of the rigid support members 31, 31, and a spring 34 has one end hooked to the rigid support members 31, 31 and urges the first lock pin 32 in the two directions of the recessed notch. ,3
It is composed of 4. Therefore, the springs 34, 34
When the operation knob 30 is pushed against the tensile force of the pillar, the engagement state of the first lock pin 32 is released and the pillar
b' becomes freely movable downward, and the headrest b descends due to its own weight, and the first lock pin 32 engages with the recessed part 2 of an appropriate height, so that the height of the headrest b is adjusted. Since the lower side of the recessed notch 2 is inclined, by lifting the headrest b without pushing the operating knob 30, the pillar b' moves upward to a predetermined height.

The lowering of the headrest b is restricted by the second lock pin 33 provided on the guide tube c1 engaging with the lowering stop notch 1 provided on the pillar b' (FIG. 3A). That is, the lock mechanism 3
On the opposite side of the slide hole 36 of . 37 and the guide holes 31a, the second
A lock pin 33 is inserted through the guide holes 31a, 31a so as to be horizontally movable, and the second lock pin 33 is connected to the other ends of springs 34, 34, which have one end hooked to the rigid support members 31, 31. The springs 34, 34 always urge the lowering stopper cutout 10, and the lower cutout 10 is engaged with the cutout 10, so that even if the operating knob 30 is pushed, the engagement does not come off. and,
In the engaged state of the notch 10, the lowering of the pillar b' is restricted, and in this state, the lowering of the pillar b' is restricted, and its lowermost end is located inside the back cross plate e, and the headrest b and the seat back a are connected to each other. There is a constant interval between them (Fig. 6). In order to move the headrest b upward from this position, since the lower side of the lowering stop notch 10 is inclined downward, it is easy to move the headrest b upwardly by lifting the headrest b without operating the operation knob 30. Moving.

Further, the rise of the headrest b is restricted by the engagement of the second lock pin 33 with the rise-preventing notch 11 provided in the pillar b' by the action of springs 34 (FIG. 3B). However, since the shape of the rise-stopping notch 11 is configured as shown in the figure, the rise is restricted as described above, but the fall can be easily performed by pushing the headrest b downward. Although not shown, the second lock pin 33 is inserted from the upper part of the support cylinder c so that the engagement state of the second lock pin 33 in the rise-stopping notch 11 can be released and the pillar b' can be pulled out from the support cylinder c. The insertion hole has been drilled. Therefore, insert a tool or the like into this insertion hole and press the second lock pin 33.
Pillar b' can be easily removed by pushing the pillar b' against the tensile force of the tension springs 34, 34.

Since the present invention is configured as described above, it has the following effects.

(1) Since a locking mechanism and a lock release mechanism are provided on the brim-like fixing part provided on the upper edge of the support tube, there is no protrusion on the part of the support tube where the bracket fits, so it can be easily and securely attached to the bracket. can.
Therefore, the ease of assembly is improved compared to conventional products, and the mounting condition of the support tube is also improved.

(2) The first lock pin is activated by operating the operation knob.
Since the lock is released, the height of the headrest can be easily adjusted and its operability is improved compared to conventional products. Further, the second lock pin is biased in the locking direction by the locking spring of the first lock pin, and there is no need to provide a separate spring exclusively for the second lock pin, which simplifies the structure of the lock mechanism.

(3) Since the first lock pin and the second lock pin are engaged perpendicularly to the axial direction of the pillar and no component force is generated, the locked state is ensured.

(4) When releasing the lock, even if you continue to push the operating knob for releasing the lock, the pillar will engage with the movement restriction notch and will not come off or fall beyond the specified level and will remain at the set position. is quickly fixed.

(5) Furthermore, by engaging the second lock pin with the notch for restricting downward movement, the descent of the pillar is restricted as described above, so the concave back surface allows the rear seat occupant's knees to move freely. It can be attached to the front seat bag without any additional mechanism.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and include FIGS. 1 to 6.
The figure shows the first embodiment, FIGS. 1 and 2 are side and perspective views showing a seat equipped with a headrest according to the present invention, and FIGS. 3A and 3B are longitudinal cross-sectional front views showing the operating state of the main parts. 4 is a cross-sectional plan view of the main part, FIG. 5 is an exploded perspective view of the same, and FIG. 6 is a longitudinal sectional side view of the same. In the figure, b' is a pillar, 2, 2... are notches for height adjustment, 10, 11 are notches for movement restriction, 30 is an operation knob for unlocking, 32 is a first lock pin, and 33 is a The second lock pins 34 each represent a spring.

Claims (1)

[Scope of utility model registration request] A pillar having a plurality of notches on one side with at least a substantially horizontal upper side for height adjustment and a notch on the other side with a substantially horizontal upper side for regulating lower limit movement, fixed to the seat back and inserted into the pillar of the headrest. an operation knob having a horizontally extending rigid support member that is slidably attached to a brim-shaped fixing part on the upper end edge of the support cylinder in a direction orthogonal to the axial direction of the pillar; and fixed to the rigid support member. A first lock pin is provided so as to be able to move in and out of a recess for adjusting the height of the pillar, and a second lock pin is supported horizontally movably on a rigid support member and is provided in and out of a notch for regulating the lower limit movement of the pillar. A device for vertically adjusting a headrest having a lock pin and at least one spring biasing each of the first and second lock pins toward the pillar.