JP3433206B2 - Leg opening and closing structure of the equipment support stand - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support leg opening / closing structure for a support stand on which various equipments are placed.

[0002]

2. Description of the Related Art For example, a boom sprayer used for spraying a chemical solution supports a machine body at a predetermined height by opening a supporting leg of a support stand arranged at a base portion of the main body when the boom sprayer is not used or stored. And when using,
After being mounted on the rear part of the agricultural tractor, the supporting legs are folded and run so as not to interfere with the work, and the chemical spraying work is performed.

Conventionally, the opening and closing of the supporting leg when not in use and when it is stored, and the maintenance and fixing of the folded state of the supporting leg when it is used, are performed on the side of the supporting leg and the base portion which are provided for opening and folding the supporting leg, respectively. This was done by matching the holes and inserting pins or bolts.

[0004]

SUMMARY OF THE INVENTION A method of adapting the foldable support leg and the hole provided on the base side, respectively, to open the support leg with a pin or a bolt, or to maintain and fix the folded state is a long-term method. In some cases, due to the weight of the placed equipment, a positional deviation may occur between the holes, making it difficult to match the positions of the holes in later use. It was apt to occur and the supporting state became unstable. Therefore, there remains a problem that it is necessary to improve the shaft accuracy and the hole accuracy, and further, it is necessary to pay attention to rust prevention measures. Furthermore, there is still a problem in work efficiency in that the supporting legs have to be opened and closed manually.

The present invention has been made in view of the above circumstances, and a support leg opening / closing structure for a support stand of various equipment, for example,
An object of the present invention is to make it possible to open and close the supporting legs of a support stand of a boom sprayer used for chemical liquid spraying work without any labor, to prevent rattling, and to provide a simple structure and low cost.

[0006]

In order to solve the above-mentioned problems, according to the present invention, upper parts of supporting legs are pivotally supported on lower left and right outer sides of a base part on which equipment is supported, and the lower surface of the base part is supported. It is configured to be foldable, and when the legs are opened, the upper ends of the support legs come into contact with the outer end surfaces of the base to maintain a predetermined open state by the weight of the equipment. The upper end is connected to both ends in the expansion / contraction direction of a single expansion / contraction actuator via a link mechanism so that it can be opened and closed.

Further, it is preferable that the supporting legs are pivotally supported by axes parallel to each other at each of four corners of the base.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing an embodiment of a supporting leg opening / closing structure of an equipment support stand according to the present invention, FIG.
FIG. 1 is an overall perspective view of a boom sprayer to which the present invention is applied.

The boom sprayer is used for spraying the chemical liquid, and as shown in FIG. 2, the chemical liquid tank 2 for storing the chemical liquid to be sprayed and the chemical liquid stored in the chemical liquid tank 2 are supplied. A fixed central boom 4 having a plurality of injection nozzles 3 for spraying a chemical liquid supplied from the chemical liquid tank 2 from the chemical liquid tank 2 on a rear portion of a main body 1 equipped with a chemical liquid pump (not shown) and other necessary equipment. On the left and right sides of the fixed central boom 4, left and right movable booms 5 and 6 having a plurality of injection nozzles 3 which are extended substantially horizontally by appropriate actuators 30a and 30b at the time of use are provided.

When not in use or when stored, FIG.
As shown in FIG. 3, the machine body is supported by the support stand 7 at a predetermined height, and when used, it is assembled to the rear part of the tractor and the supporting legs of the support stand 7 are folded to perform the spraying work while traveling.

The present invention relates to a support leg opening / closing structure for the support stand 7, one embodiment of which is shown in FIG. The supporting legs are provided at the four corners of the base portion 9 of the support stand 7, respectively. In the following description, the left and right front and rear supporting legs, that is, the right and front supporting legs 8a, 8a and the left and right supporting legs, respectively. Support leg 8b of
8b are parallel axes 11a, 11a, 11
The structure is supported by b and 11b.

Therefore, in the following description, the "right front and rear support legs" are simply referred to as "right support legs 8a" and the "left front and rear support legs" are simply referred to as "left support legs 8b".

In the figure, reference numeral 9 is a base portion, which has a strength for supporting the entire boom sprayer. Also, 1
Reference numeral 0 denotes a frame body standing upright on the rear side of the base 9, and the main body 1 of the boom sprayer is attached thereto by bolts or the like.

According to the present invention, upper portions 21a and 21b of the right supporting leg 8a and the left supporting leg 8b are respectively provided on the lower left and right outer sides of the four corners of the base 9, and are arranged along the front-rear direction of the main body 1. It is axially supported by mutually parallel shafts 11a and 11b, and is configured to be foldable in the left-right direction on the lower surface of the base portion 9.

Specifically, to the left and right of the base portion 9, support plates 12a and 12b extending outward and downward are provided.
The upper portions of the right support leg 8a and the left support leg 8b are rotatably supported by the shafts 11a and 11b at the outer lower portions of the base plates 9 of the support plates 12a and 12b. Therefore, the right support leg 8a and the left support leg 8b are freely foldable on the lower surface of the base 9.

In the embodiment of the present invention, at the same time as the above-mentioned configuration, the upper ends 13 of the right support leg 8a and the left support leg 8b are opened when the legs are opened.
a and 13b are outer end faces 14a, 14 of the base part 9
The main body 1 is contacted with b and the predetermined open state is maintained by the weight of the main body 1.

That is, depending on the weight of the equipment supported on the upper surface of the base 9, the right support leg 8a and the left support leg 8b.
Is prevented from being opened to the outside more than a prescribed amount by reliably contacting the outer end surfaces 14a and 14b of the base portion 9 with the upper ends 13a and 13b of the supporting legs 8a and 8b from the outer side. So-called rattling does not occur between the part 9 and the right supporting leg 8a and the left supporting leg 8b, and a stable open leg state is always maintained.

Further, in the embodiment of the present invention, the upper ends 13a and 13b of the right support leg 8a and the left support leg 8b are of a single electric type or the like via a link mechanism such as a four-bar mechanism. The right and left supporting legs 8a and 8b are configured to be openable and closable by being connected to both ends 15a and 15b of the extending and contracting actuator 15 in the extending and contracting direction.

That is, the right support leg 8a and the left support leg 8b
The movable links 16 are attached to the respective upper ends 13a and 13b of the
One end 16c of each of a and 16b is rotatably connected by a pin 17a and 17b, and the other end 16d of each of the movable links 16a and 16b has one end 19c.
Together with the other ends 19d of the rotation links 19a and 19b pivotally supported by the pins 18a and 18b on the base portion 9 side, and the respective expansion and contraction end portions 15a of the expansion and contraction actuator 15.
And 15b are rotatably connected by pins 20a and 20b.

In the above-mentioned structure, the expansion / contraction actuator 15 has its both ends 15a and 15b in the expansion / contraction direction supported by the rotary links 19a and 19b, and is not fixed at a fixed position, but is accompanied by its expansion / contraction operation. It moves up and down almost parallel to the ground as a whole.

In the above configuration, the actuator 1
When 5 is contracted, the movable links 16a and 16b,
The other end 19 of each of the rotating links 19a and 19b
d, and the upper ends 13a and 13b of the right support leg 8a and the left support leg 8b are pulled toward the actuator 15 side.

As a result, the right supporting leg 8a and the left supporting leg 8b.
The lower part of the shaft is opened outward with the shafts 11a and 11b as the fulcrum to open the legs. In the above-described leg opening operation, it is not necessary that the right support leg 8a and the left support leg 8b simultaneously operate bilaterally symmetrically.

That is, the right support leg 8a or the left support leg 8b
If one of the right supporting leg 8a or the left supporting leg 8b is moved earlier, the upper end 13a or 1
3b is the outer end surface 14a or 14b of the base 9.
Then, the other left support leg 8b or the right support leg 8a is brought into a predetermined open leg state, and the other left support leg 8b or the right support leg 8a is finally brought into a predetermined open state, and finally, the right support leg 8a and the left support leg 8b. The upper ends 13a and 13b are 9 of the base portion.
It is regulated by the outer end surfaces 14a and 14b, and a predetermined leg is opened.

When closing the right support leg 8a and the left support leg 8b, the actuator 15 may be extended. That is, when the actuator 15 is extended,
The movable links 16a and 16b are the rotary links 19
It is regulated by a and 19b and pushed out, and at the same time,
Upper ends 13a and 13b of the right support leg 8a and the left support leg 8b
But they are pushed out respectively.

As a result, the right support leg 8a and the left support leg 8b
The lower part of is folded inward with the shafts 11a and 11b as fulcrums. In this folding operation as well, it is not necessary for the right support leg 8a and the left support leg 8b to move symmetrically at the same time, as in the case of the opening operation.

As described above, according to the present mechanism, a plurality of leg portions can be opened and closed by one telescopic actuator, and the structure can be provided at a low cost.

[0027]

According to the present invention, various equipment, for example, support legs of a support stand such as a boom sprayer used for spraying chemicals can be opened and closed without any labor and without rattling. The structure is simple and can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a support leg opening / closing structure of an equipment support stand according to the present invention.

FIG. 2 is an overall perspective view of a boom sprayer to which the present invention is applied.

[Explanation of symbols]

1 Equipment (main body) 8a Right support leg 8b Left supporting leg 9 base part 11a axis 11b axis 13a Upper end of right support leg 13b Upper end of left support leg 14a, 14b Outer end surface of base 15 Telescopic actuator 15a, 15b Both ends of the actuator in the expansion / contraction direction 16a, 16b, 19a, 19b Link mechanism 21a Upper right leg 21b Upper part of the left supporting leg

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Showa 49-17977 (JP, U) Showa 60-149931 (JP, U) Showahei 1-122362 (JP, U) Showa 2- 147269 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16M 11/00 A01M 7/00

Claims (2)

(57) [Claims] 1. An upper portion (21) of a supporting leg (8a, 8b) is provided on the lower left and right outer sides of a base (9) on which the equipment (1) is supported.
a, 21b) are pivotally supported and foldable on the lower surface of the base (9), and when the legs are opened, the support legs (8a, 8b) are formed.
The upper end (13a, 13b) of (b) abuts the outer end surface (14a, 14b) of the base (9) so that a predetermined open state is maintained by the weight of the equipment (1). Upper ends (13a, 1) of the left and right supporting legs (8a, 8b)
3b) are link mechanisms (16a, 16b, 19), respectively.
a, 19b) via one telescopic actuator (1
5) A support leg opening / closing structure for an equipment support stand, characterized in that it is connected to both ends (15a, 15b) in the expansion / contraction direction. 2. The supporting legs (8a, 8a, 8b, 8b) are axially supported by mutually parallel axes (11a, 11a, 11b, 11b) at each of four corners of the base (9). The support leg opening / closing structure of the equipment support stand according to claim 1.