JP3280236B2 - Suspension seat for special vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension seat for a special vehicle used for a driver's seat of a special vehicle having a large vibration such as a forklift or a tractor.

[0002]

2. Description of the Related Art Chairs used for special vehicles such as forklifts and tractors are required to reduce a large shock generated when the vehicle is running.
As disclosed in Japanese Patent No. 8138, a suspension seat in which a shock absorber or a spring is arranged at the back of a seat back supported on a base frame via a link is widely used. In such a suspension seat, a spring is used. It is normal to adjust the spring force of the spring in accordance with the weight of the user by moving the adjuster rod suspended up and down by a rotating operation. However,
In this type of conventional suspension seat, the upper end of the adjuster rod is used as a tool engaging portion, and a rotating tool such as a wrench is engaged with the upper end of the adjuster rod to rotate the adjuster rod forward or backward. Since the knob is provided and the adjuster rod is turned forward and backward by manual operation of the knob, it is necessary to bring a turning tool in the former, which is troublesome, and in the latter, the turning operation is There is a problem that the required force is large and it is difficult to adjust the spring force, and the adjustment operation takes a long time.

[0003]

An object of the present invention is to solve the above-mentioned conventional problems and to adjust the adjuster in a short time with a small force without bringing in a rotating tool such as a spanner. It is an object of the present invention to provide a suspension seat for a special vehicle, which can rotate a rod forward and backward and perform accurate and easy spring force adjustment.

[0004]

SUMMARY OF THE INVENTION A suspension seat for a special vehicle according to the present invention, which has been made to solve the above-mentioned problems, is provided at the back of a seat body, and the seat body is suspended from a base frame. Suspension seat for a special vehicle in which the upper end of the spring is connected to a rotatable adjuster rod and the spring force of the spring is adjusted to one according to the weight of the user when the adjuster rod is rotated forward and backward. Wherein a rotation operation arm is mounted on the upper end of the adjuster rod with a ratchet mechanism capable of switching the rotation restricting direction by a switching operation of a switching lever attached thereto interposed therebetween. Things.

[0005]

SUMMARY OF THE INVENTION A suspension seat for a special vehicle according to the present invention, which has been made to solve the above-mentioned problems, is provided at the back of a seat body, and the seat body is suspended from a base frame. Suspension seat for a special vehicle in which the upper end of the spring is connected to a rotatable adjuster rod and the spring force of the spring is adjusted to one according to the weight of the user when the adjuster rod is rotated forward and backward. , A plate-shaped pivot supported at the upper end of the adjuster rod so as to be horizontally pivotable.
The operation arm is mounted with a ratchet mechanism capable of switching the rotation restricting direction by a switching operation of a switching lever attached thereto interposed therebetween.

Reference numeral 6 denotes a spring disposed on the back of the seat body 1 for suspending the seat body 1. The spring 6 has a lower end connected to a lower end of a rear portion of the seat frame 1a and an upper end formed of a base. The operating portion at the shaft end from the upper end of the back portion 2b of the frame 2 is connected via a support arm 8 to an adjuster rod 7 that is exposed to the outside. When the adjuster rod 7 is rotated, it is screwed into the adjuster rod 7. The supporting arm 8 moves up and down, and the spring force of the spring 6 is adjusted by this elevating position. The above structure is almost different from the conventional suspension seat for this kind of special vehicle. Therefore, detailed description is omitted.

Reference numeral 9 denotes a turning arm for turning the adjuster rod 7, and 10 denotes a ratchet mechanism interposed between the turning operation arm 9 and the adjuster rod 7. As shown in FIG. 4, the ratchet mechanism 10 includes a ratchet gear 10 a that is fitted into a square shaft portion at the shaft end of the adjuster rod 7 with a square hole and is integrally rotated.
Both wings are provided on the lower surface of the turning operation arm 9.
A swingable switching lever 10b which is rotatably supported so as to protrude from both sides thereof and which is formed at both wing ends so that one of ratchet claws 10c and 10d can be engaged with the ratchet gear 10a; , And one of the ratchet pawls 10c and 10d is pulled to engage with the ratchet gear 10a.
e, and the pivoting arm 9 pivots horizontally on a disk formed on the upper surface of the ratchet gear 10a with the lower surface in contact with the upper surface of the ratchet gear 10a. The above-mentioned ratchet mechanism 10 is supported by a plate-like member, and when the turning operation arm 9 is turned forward and backward.
As a result, the adjuster rod 7 rotates in one of the forward and reverse directions in conjunction therewith, but in the other direction, the rotation is restricted so that only the turning operation arm 9 rotates without the adjuster rod 7. I have.

As described above, the rotation operation arm 9 is attached to the upper end of the adjuster rod 7 via the ratchet mechanism 10 so that the rotation of the adjuster rod 7 can be performed by using a rotation tool such as a spanner or manually operating the knob. This operation can be easily performed only by repeating the forward / backward rotation of the rotation operation arm 9 without causing the rotation. That is, when one ratchet claw 10c is engaged with the gear 10a as shown by the dashed line in the figure, the adjuster rod 7 rotates only when the rotation arm 9 is rotated clockwise. The arm 9 is rotated clockwise in conjunction with the operation arm 9, and is turned.
When is rotated in the counterclockwise direction, only the turning operation arm 9 idles without involving the adjuster rod 7, so that
When the forward / backward rotation of the rotation arm 9 is repeated, the adjuster rod 7 rotates clockwise and the support arm 8 descends, whereby the spring force of the spring 6 is weakened.
On the other hand, if the switching lever 10b is switched in the reverse direction and the forward / backward rotation of the rotation arm 9 is repeated as described above, the adjuster rod 7 is rotated only in the counterclockwise direction, and the support arm 8 is raised accordingly. As a result, the spring force of the spring 6 is increased. As shown in FIG. 5, the switching lever 10b is entirely covered with a synthetic resin ratchet cover 10f.
According to the display of the increase / decrease mode such as + and-displayed on,
The switching lever 10b can be easily and accurately switched.

In the drawing, two springs 6 are extended right and left with respect to a horizontally extending support arm 8 with a shock absorber 5 interposed therebetween, as shown in FIG. And the seat body 1
Even when a load is applied with an inclination angle, the overall structure is configured to be able to stably absorb and reduce the impact. As shown in FIG. 3, the support arm 8 is provided with an elastic support needle 8a, which projects from the display window 11 of the backboard.
By moving up and down in accordance with the weight scale displayed there, it is configured as a guide for weight adjustment.

The seat body 1 constructed as described above is supported on a base frame 2 via links 3 and 4.
The shock generated during driving is sufficiently mitigated by the suspension type suspension mechanism including the shock absorber 5 and the spring 6 at the back of the vehicle, and depending on the weight of the driver before or during driving. The point of adjusting the weight of the seat is the same as that of a conventional suspension seat for a special vehicle of this type, but the operation of adjusting the spring force according to the weight is only repeated forward and reverse rotations of the turning operation arm 9. As a result, the operability is good, the operation load is small, and the spring force can be easily and accurately adjusted in a short time. In addition,
According to the experiment, in contrast to the conventional adjuster rod having a knob provided at the upper end, the one shown in the drawing can rotate the arm 9 with an operation load of less than half, and has a small operation load and excellent operability. It was confirmed that there was.

[0011]

As is apparent from the above description, according to the present invention, it is possible to sufficiently alleviate the shock generated during operation and to rotate the adjuster rod forward and backward without using a tool such as a spanner. It can be moved and the operation of adjusting the spring force according to the weight can be performed accurately and easily, and the rotation operation can be performed with a small force and in a short time. There is also an advantage that it can be produced at a low cost with a structure. Therefore, the present invention greatly contributes to industrial development as a suspension seat for a special vehicle that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing an embodiment of the present invention.

FIG. 2 is a front view of a main part showing the embodiment of the present invention.

FIG. 3 is a perspective view showing an embodiment of the present invention.

FIG. 4 is a plan view showing a ratchet lever.

FIG. 5 is a plan view showing a state where FIG. 4 is covered with a ratchet cover.

[Explanation of symbols]

 1a Seat frame 2 Base frame 6 Spring 7 Adjuster rod 8 Support arm 9 Rotating operation arm 10 Ratchet mechanism 10a Ratchet gear 10b Switching lever 10c Ratchet pawl 10d Ratchet pawl 10e Spring

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor, Masanori Fujiwara 1-335, Kakurei, Shiga-cho, Toyota-shi, Aichi Prefecture (56) References JP-A-7-2010 (JP, A) Japanese Utility Model Application 63-128138 (JP) , U) Japanese Utility Model Hei 2-47180 (JP, U) Japanese Utility Model Hei 6-18061 (JP, U) Japanese Utility Model Utility Model No. 6-53281 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) B60N 2/38 B60N 2/54

Claims (2)

(57) [Claims] An upper end of a spring provided on a back portion of a seat body and suspending the seat body on a base frame is connected to a rotatable adjuster rod, and the adjuster rod is rotated forward and backward. In a suspension seat for a special vehicle in which a spring force of a spring is adjusted to a value corresponding to a weight of a user, a plate-like member rotatably and horizontally supported at an upper end of the adjuster rod.
A suspension seat for a special vehicle, wherein the arm for turning operation is mounted with a ratchet mechanism capable of switching the rotation restricting direction by a switching operation of a switching lever attached thereto interposed therebetween. 2. A ratchet mechanism, wherein a ratchet mechanism is attached to a shaft end of an adjuster rod so as to be integrally rotated therewith, and a rotating operation pivotally supported by a shaft end of the adjuster rod. A switching lever having a ratchet pawl formed on the lower surface of the middle portion of the arm so as to be swingable and capable of engaging with the ratchet gear on both wing ends; and one of the ratchet pawls on both wing ends by pulling the switching lever. The suspension seat for a special vehicle according to claim 1, further comprising a spring that constantly engages the ratchet gear.