JPH0537706Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a seat used as a driver's seat of a tractor or the like.

[Prior Art] Conventional seats of this type are equipped with a height adjustment mechanism and a cushion mechanism, which adjust the height of the seat to suit the physique of the driver, absorb vibrations during driving, This provides a comfortable driving condition.

[Problems to be solved by the invention] However, in conventional seats, the height adjustment mechanism and cushion mechanism are individually arranged.
The problem was that the structure was complicated, the weight increased, and the manufacturing cost increased.

This invention was made in order to solve the above-mentioned problem, and the purpose is to provide a seat that has a simple structure and can reduce weight and manufacturing cost.

[Means for solving the problem] In order to achieve the above object, the present invention provides a seat belt having a base portion, a seat portion disposed above the base portion, and a pair of links connected to each other so as to be rotatable about an axis whose center portions face horizontally,
an engagement portion provided between one of the pair of links and one of the base portion and the seat portion, the engagement portion being capable of releasably engaging with each other to prevent a lower end of one link from moving in a direction toward or away from a lower end of the other link;
A plurality of links are formed spaced apart from each other in the approaching and separating direction, and the other of the pair of links is arranged to be movable in the approaching and separating direction relative to the other of the base portion and the sheet portion, and an elastic member is provided between the other movable link and the base portion or sheet portion on which the other link is movably arranged, for biasing the other link in the opposite direction when the other link attempts to move in the direction away from the one link.

[Operation] When a driver or the like sits on the seat portion, the movable link of the pair of links moves in a direction away from the other links. As a result, the seat portion moves downward and the elastic member is elastically deformed. The seat portion then comes to rest at a position where the load applied by the driver and the biasing force of the elastic member are balanced. Of course, if acceleration due to vibration or the like is applied to the seat part, the seat part will vibrate about its rest position, but this vibration is relaxed and absorbed by the elastic member.

Furthermore, if the engaging part where one link engages with the base part or the seat is changed from one engaging part to another, the distance between the lower ends of the pair of links changes, and accordingly. The height of the legs, which are made up of a pair of links, changes. This allows you to change the height of the seat.

[Example] Hereinafter, an example of this invention will be described with reference to FIGS. 1 to 7.

1 to 5 show an embodiment of this invention, with FIG. 1 being a perspective view thereof and FIG. 2 being a front view thereof. As shown in these figures, the seat A of this embodiment includes a base part 1, a seat part 2 arranged above the base part 1, and a seat part 2 arranged between the base part 1 and the seat part 2. It is composed of a leg portion 3.

The base part 1 is box-shaped with a shallow depth.
It includes a bottom plate 11, front and rear side plates 12 and 13, and left and right side plates 14 and 15. Extending guide plates 16 and 17 extending parallel to the bottom plate 11 are provided at the upper end of the corner formed by the front side plate 12 and the left side plate 14, and at the upper end of the corner formed between the rear side plate 13 and the left side plate 14, respectively. ing. Furthermore, three engagement holes (engaging portions) 12a, 12b, and 12c passing through the front plate 12 are formed at the right end of the front plate 12, spaced apart from each other in the left and right directions. Each engagement hole 12a, 12b,
12c are formed to have the same diameter, and the left and right engagement holes 12a, 12c and the center engagement hole 12b
The slots 12d and 12e are narrower in width than their diameters and communicated with each other by slots 12d and 12e of the same width.

In addition, the right end of the rear side plate 13 also has an engagement hole (fourth
Only the engagement hole 13c is shown in the figure. Others are not shown. ) and slots that communicate with each of the engaging holes are formed.

Further, the seat section 2 is formed in the same manner as the base section 1 except that the seat section 2 is upside down. That is, the seat portion 2 includes a top plate 21, front and rear side plates 22,
23 and left and right side plates 24, 25,
Guide plates (only one guide plate 26 is shown, the other is not shown) are provided at the corners formed by the left side plate 24 and the front and rear side plates 22 and 23, and the front side plate 22
Three engaging holes (engaging parts) 22a, 22b, 22
c and slots 22d and 22e, and three engagement holes and slots (none of which are shown) are formed in the rear plate.

Further, the leg portion 3 includes two pairs of links 31a, 31
b, 32a, and 32b. Each link 31
a to 32b are formed to have the same dimensions,
The center portion of one pair of links 31a, 31b is rotatably provided at one end of the connecting shaft 33, and the center portion of the other pair of links 32a, 32b is rotatably provided at one end of the connecting shaft 33.
It is rotatably provided at the other end. and,
These two pairs of links 31a, 31b, 32a, 3
2b has one pair of links 31a, 31b located on the front side plate 12 side, and the other pair of links 32a, 3
2b is positioned on the rear side plate 13 side.

As shown in FIG. 3, the links 31a and 32a have an engaging shaft 34 passing through their lower ends.
is provided so as to be movable in the axial direction. This engagement shaft 34 consists of a head 34a having a larger diameter than the engagement hole 12c and a body 34b having a slightly smaller diameter than the engagement hole 12c.As shown in FIG. Narrow portions 34c and 34d, which are slightly narrower than the slot 12d, are formed at the end of the body 34b and the other end of the body 34b, respectively.

As shown in FIG. 4, the engagement shaft 34 configured in this manner has an end on the head 34a side of the body 34b passing through the engagement hole 12c, and the other end passing through the engagement hole 13c. It is arranged as follows. A spring 35 is disposed between the head 34a and the front plate 12 to bias the head 34a in the direction of separating the head 34a from the front plate 12. Nuts 36a and 36b are attached to the ends.
are screwed and fixed, and the nut 36a is abutted against the rear side plate 13 by the biasing force of the spring 35. In this state, the narrow portion 3 of the body portion 34b
Portions other than 4c and 34d are engagement holes 12c and 13c
penetrates through. Therefore, the engagement shaft 34 is fixed in position. However, the engagement shaft 34 is
When it is moved against the urging force of , the narrow part 34c passes through the engagement hole 12c, and the other narrow part 34d comes to pass through the engagement hole 13c. Therefore, in this state, the narrow portion 34c is passed through the slots 12d and 12e, and the narrow portion 34c is passed through the slots 12d and 12e.
4d through the slot formed in the rear plate 13, the engagement shaft 34 is inserted into the other engagement hole 12.
It is now possible to move it to the a and 12b sides.

The links 31b and 32b also have a reinforcing shaft 3 that passes through their lower ends in an axial direction.
7 is provided. Rollers 38 are rotatably provided at both ends of the reinforcing shaft 37, respectively. One roller 38 fits between the guide plate 16 and the bottom plate 11, and the other roller 38 fits between the guide plate 17
and the bottom plate 11. The link 31b is in contact with the base portion 1 via the rollers 38, thereby allowing the link 31b to move toward and away from the other link 31a. Further, a support spring (elastic member) 39 is provided between the reinforcing shaft 37 and the base portion 1. This support spring 39 is provided at its natural length. Therefore, the support spring 39 does not apply any force to the reinforcing shaft 37 when no load is applied to the seat part 2, but when a load is applied to the seat part 2, the links 31b and 32b are moved to the link 31a,
If you try to move away from 32a,
The reinforcing shaft 37 forces the links 31b and 32b in a direction toward the links 31a and 32a.

In addition, links 31a, 31b, 32a, 32b
The related structure of the and seat part 2 is their link 3
Since the related structure is the same as that between 1a to 32b and the base part 1, similar parts will be given the same reference numerals and explanations thereof will be omitted. However, link 31a,
No support spring is provided between the reinforcing shaft 37 provided at the upper end of the seat 32a and the seat portion 2.

In the seat A configured as described above, when a driver or the like sits on the seat section 2 and a load is applied to the seat section 2, the seat section 2 moves downward and the links 31b and 32b move between the links 31a and 31.
Move in the direction away from a. As a result, the support spring 39 is expanded and urges the reinforcing shaft 37 to prevent movement of the links 31b and 32b. When this urging force and the load applied to the seat section 2 match, the seat section 2 stops. In this state,
If vibrations are applied to the seat A, the impact of the vibrations is alleviated by the elastic deformation of the support spring 39.

Also, from the illustrated state, the engagement shaft 34 is inserted into the engagement hole 12.
b or 12a, the links 31a,
32a moves closer to the links 31b and 32b. On the other hand, the links 31b and 32b are
The position is fixed by a support spring 39. Therefore, the angle θ between the links 31a and 31b becomes smaller, and the height of the leg portion 3 becomes higher. This allows the height of the seat A to be adjusted higher.

Further, FIGS. 6 and 7 show other embodiments of this invention. Seat B in this example
are the engagement holes 12a to 12 shown in FIGS. 1 to 5.
c and 13c, three engagement grooves 12f, 12g, 12h are provided on the front side plate 12, and three engagement grooves 12h are provided on the rear side plate 13.
In addition, in place of the engagement holes 22a to 22c of the front side plate 22 of the seat portion 2 and the engagement holes of the rear side plate 23, Engagement grooves 22d, 22e, 2
2f, and three engagement grooves (not shown) in the rear side plate 23.
was formed.

In this embodiment, when adjusting the height of the seat part 2, the engagement shafts 34 provided at the lower ends of the links 31a and 32a are taken out from the engagement grooves 12h and 22h (12f, 12g), and the other Engagement groove 12f or 12g (12h and 22h)
Insert into. Similarly, links 31b and 32b
The engagement shaft 34 provided in the engagement groove 22f (22d,
22e) and insert it into the other engagement groove 22d or 22e (22f). Note that the engagement shaft 34
To remove it from the engagement groove, pull it out through the opening at the top or bottom of the groove. Therefore, in this case, the engagement shaft 34 has the narrow portion 3 as in the embodiment described above.
There is no need to form 4c and 34d. Furthermore, since there is no need to move the engaging portion 34 in the axial direction,
Heads 34a are formed at both ends of the engagement shaft 34, respectively.

Note that in each of the above embodiments, the link 31
Reinforcement shaft 37 provided at the lower end of b and 32b
A support spring 39 is provided between the support spring 39 and the base portion 1, but together with or in place of the support spring 39, a support spring 39 is provided between the reinforcing shaft 37 provided at the upper end portions of the links 31a and 32a and the seat portion 2. A support spring may also be provided.

Further, the engagement shafts 34 provided in the links 31b and 32b are connected to the engagement holes 22a to 22c or 22d.
Although the engagement shaft 34 is removably engaged with the seat 22f so that the engagement position with respect to the seat portion 2 can be changed, the engagement shaft 34 may be rotatably fixed to the seat portion 2. Conversely, when a support spring is provided between the reinforcing shaft 37 and the seat portion 2 as described above, the engagement shaft 34 provided on the links 31a and 32a is rotatably fixed to the base portion 1. You can.

[Effects of the invention] As explained above, according to the seat of this invention, although it is equipped with a height adjustment mechanism and a cushion mechanism, there is a gap between one of the pair of links and one of the base part and the seat part. It has a simple structure in which a plurality of removable engagement parts are formed at the same time, and an elastic member is provided between the other of the pair of links and the other of the base part and the seat part, so that the weight can be reduced. In addition, effects such as being able to reduce manufacturing costs can be obtained.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of this invention; Figure 1 is a perspective view thereof, Figure 2 is a front view thereof, Figure 3 is a perspective view showing the legs, and Figure 4 is a perspective view of the device. FIG. 5 is an enlarged perspective view showing the engagement shaft, and FIGS. 6 and 7 show other embodiments of this invention, and FIG. 6 is a front view thereof. , FIG. 7 is an enlarged sectional view taken along the line - in FIG. 6. 1... Base part, 2... Seat part, 3... Leg part, 12a, 12b, 12c, 13c... Engagement hole (engaging part), 12f, 12g, 12h, 13h...
Engagement groove (engagement part), 34...Engagement shaft (engagement part), 3
9...Support spring (elastic member).

Claims (1)

[Scope of utility model registration request] It has a base part, a seat part disposed above the base part, and a pair of links whose central parts are rotatably connected to each other about an axis oriented in a horizontal direction, the base part and the seat part. and a leg disposed between one of the pair of links, one of the base part and one of the seat part, and one of the links is removably engaged with the other of the pair of links and one of the base part and the seat part. A plurality of engaging portions are formed spaced apart from each other in the direction of approaching and separating, and prevent the lower end of the link from moving toward and away from the lower end of the other link, and is provided so as to be movable in the direction toward and away from the other of the base portion and the seat portion, and the other movable link and the base portion are provided such that the other link is movable; A seat characterized in that an elastic member is provided between the seat portion and the elastic member that biases the other link in the opposite direction when the other link attempts to move away from the one link.