JPH09207635A - Rotatable seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the vibration amount of a seat at the front end when the seat is rotated to the right and left. SOLUTION: The rotational center L of a seat 100 supported by a column 22 in a rotatable manner is arranged at a preset distance frontward from a gravity center point HP as designed for the person seated, set on a seat cushion 101. At the lower face of the seat cushion 101 backward from the gravity center point HP, a caster 70 is provided to roll while supporting the loading of the seat 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating seat suitable for use in construction machines such as power shovels and other working machines.

[0002]

2. Description of the Related Art Generally, in a rotating seat, the center of rotation of the seat is determined so as to pass through or near a center of gravity (hip point) when a person sits on the seat. This is because by doing so, the bias of the load can be eliminated and the seat can be stably rotated.

[0003]

However, when the above rotary sheet is used for a working machine, for example, a power shovel, there are the following inconveniences. That is, in a power shovel, a lever or the like operated by a seated person by hand is arranged in a fixed position in front of the rotating seat,
The rotating seat, the lever and the like are arranged in such a positional relationship that the lever and the like are most easily operated when the rotating seat is directed forward. Therefore, when the rotating seat is rotated, the orientation of the seated person deviates from the lever or the like by the amount of rotation of the seat, and the seated person shakes his / her arm largely in the direction opposite to the seat rotation direction. There is a problem that it is very difficult to operate the lever and the like because the lever has to be operated.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 is a rotary seat in which a seat is rotatably provided on a fixed base, and the center of rotation of the seat is set to the seat. It is characterized in that it is placed a predetermined distance in front of the set center of gravity of the seated person's design. In this case, it is desirable that a support member, which supports the seat and allows the seat to rotate, is disposed between the fixed base and the seat, behind the center of gravity point. As the support member, it is desirable to use a caster attached to the lower surface of the seat and rolling on the fixed base.
Further, a pillar is erected on the fixed base, an annular flange portion is provided on the outer periphery of the pillar, and a pair of sandwiching plates connected to each other above and below the flange portion are rotatably slidably provided. It is desirable that the holding plate be rotatably supported by the holding plate by connecting and fixing the holding plate to the sheet.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The rotating seat of this embodiment is mounted on a swivel base of a mini excavator shown in FIG. Therefore, I will first discuss mini excavators.

In this mini excavator, the vehicle body 1 has a crawler 2
The vehicle body 1 is provided with a blade 9 at the front portion thereof, and a swivel base 3 for swiveling horizontally is provided on the vehicle body 1. A work implement mounting portion 5 is provided at the front part of the swivel base 3, and a boom 6 is attached to the work implement mounting portion 5.
Has a base end rotatably mounted in the horizontal and vertical directions, a boom 6 has a base end mounted with a base end of the arm 7 rotatably in the vertical direction, and the arm 7 has a bucket 8 mounted at the front end thereof. Is attached so as to be vertically rotatable. Further, on the swivel base 3, the rotating seat 1 on which the driver sits
0 is provided.

FIG. 1 is a side view showing a schematic structure of the rotating seat 10, FIG. 2 is a schematic sectional view showing a structure of a rotation supporting mechanism 20 of the rotating seat 10, and FIGS. FIG. 6 is an exploded perspective view showing a specific configuration example of the support mechanism, and FIG. 6 is a plan view showing an assembled state of the rotation support mechanism in the specific configuration example. First, the overall configuration of the seat of the rotating seat 10 and its support mechanism will be described with reference to FIGS. 3 to 5.

In FIG. 3, reference numeral 100 designates the rotating sheet 1.
It is a 0 sheet. The seat 100 is composed of a seat cushion 101 and a seat back 102, and the mounting frame 3 is provided on the lower surface of the seat cushion 101.
1 is fixed. The mounting frame 31 has a rectangular shape and, as shown in FIG. 4, an upper turn base plate (corresponding to the sandwiching plate of claim 4) 33 via a spacer 32.
It is fixed to the upper surface of. Upper turn base plate 33
A band brake mechanism 50 described later is disposed between the mounting frame 31 and the mounting frame 31.

Below the upper turn base plate 33,
5, fixed base plate (fixed base)
21 are provided. The fixed base plate 21 has two sets of left and right rails 110 on the upper surface of the swivel base 3 (see FIG. 8).
It is attached via L, 112L, 110R and 112R so that it can move in the front-back direction of the vehicle body 1.
The rotation support mechanism 20 that supports the seat 100 rotatably in the horizontal direction is disposed between the upper turn base plate 33 and the fixed base plate 21.

Next, the rotation support mechanism 20 will be described with reference to FIGS. 2, 5, and 6. A fixed base plate 21 fixed to the swivel base 3 side is provided with a column 22 made of a cylindrical pipe. An annular flange portion 23 is provided on the outer periphery of the upper portion of the column 22. The upper turn base plate 33 is placed on the upper surface of the flange portion 23, and
The upper end of 2 penetrates through a circular through hole 33 a formed in the upper turn base plate 33 so as to be relatively rotatable, and projects upward from the upper turn base plate 33. A band 51 of a band brake mechanism 50 having the support 22 as a virtual brake drum is wound around the outer periphery of the upper end of the support 22 protruding from the upper turn base plate 33. The band 51 is wound around the support column 22 by being pulled by a spring 52 via a link 53 that is rotatable about a rotation shaft 53a, which prevents the upper turn base plate 33 from rotating. As a result, the rotation of the seat 100 is blocked.
On the other hand, when the lever 54 is rotated upward to rotate the link 53 against the urging force of the spring 52, the band 51 is loosened, and the upper turn base plate 33 and the seat 100.
Can rotate freely.

A lower turn base plate, which is rotatably and slidably sandwiched between the upper and lower surfaces of the flange portion 23, is connected to the upper turn base plate 33 on the lower side of the flange portion 23. (Corresponding) 34 is provided. Also on this lower turn base plate 34,
A circular through hole 34a that penetrates the support column 22 is provided, and the outer periphery of the support column 22 regulates the positions of the peripheral edges of the through holes 33a and 34a, so that as shown in FIG.
The upper turn base plate 33 and the lower turn base plate 34 are rotatably supported around the rotation center L which is the central axis of the support column 22, so that the seat 100 is the axis line of the support column 22, as shown in FIG. 1. It can rotate around the rotation center L.

What is important here is that the center of rotation L of the seat 100 by the support column 22 is forward by a predetermined distance from the designed center of gravity (hip point) HP of the seated person on the seat cushion 101. It is arranged. The predetermined distance in this case can be appropriately set according to design requirements and the like, but the seat cushion 101
Also, it is preferable to make it as large as possible in consideration of the strength of the column 22 and the like. In this embodiment, the distance is set to be larger than the radius of the column 22 formed of a cylindrical pipe.

When the rotation center L of the seat 100 is arranged at a position deviated from the center of gravity HP in this way, the seat cushion 101 is biased by the load of the seated person. In this respect, the rotation support mechanism 20 receives the load of the seat cushion 101 on the wide support surface of the flange portion 23 formed on the support column 22 and the upper and lower turn base plates 33 and 34 that sandwich the support portion 23 vertically. The structure is advantageous in strength against such an unbalanced load.
However, the influence of the unbalanced load is still large.

Therefore, the rotating sheet 10 according to this embodiment.
Then, the caster 70 is used as a support member for preventing the seat cushion 101 from bending and reducing the load on the rotation support mechanism 20. This caster 70
Is the seat cushion 1 behind the center of gravity HP
01 is attached to the lower surface of the fixed base plate 21, and freely rolls on the upper surface of the fixed base plate 21 so as to draw an arc around the rotation center L, thereby allowing the seat 100 to rotate and supporting the load of the seat cushion 100. It is a thing.

Returning to the description of the rotation support mechanism 20,
As shown in FIG. 5, the lower turn base plate 34 of the rotation support mechanism 20 is halved so that it can be fitted to the outer circumference of the lower column 22 of the flange 23 from the outside thereof. 34L and 34R are coupled to the lower surface of the upper turn base plate 33 by bolts 38 and nuts 39 arranged at intervals in the circumferential direction. The bolt 38 has a collar 40 as a spacer.
The collar 40 secures a gap S between the upper and lower turn base plates 33 and 34 for accommodating the flange 23 in a rotatable and slidable manner. Instead of the collar 40, the upper turn base plate 33 or the lower turn base plate 34 may be provided with a protrusion or the like for ensuring a gap.

Between the sliding surfaces of the upper and lower turn base plates 33 and 34 and the flange portion 23 formed of steel plates, stainless washer plates 35 and 36 for improving sliding of the sliding surfaces are provided. Has been inserted. An appropriate amount of grease is applied to the sliding surfaces of the washer plates 35 and 36. Further, the washer plate 36 on the lower turn base plate 34 side is halved similarly to the lower turn base plate 34, and the respective halves 36L and 36R are respectively halved of the lower turn base plate 34.
Engage the bolt 38 of L, 34R via the collar 40,
This prevents it from falling out. The flange portion 23 and the two washer plates 35, 3
6 is the thickness of the upper and lower turn base plates 3
It is set to be a little smaller than the gap S secured between 3, 34. In this embodiment, rather than the gap S,
It is set small by about 0.3 mm.

Further, as shown in FIG. 6, the flange portion 23
On the outer periphery of the stopper portion 23a at an appropriate position in the circumferential direction,
23a is projected. These stopper portions 23a
Is inserted between two collar bolts 38, 38 that are circumferentially adjacent to each other, as shown in FIG. Then, the bolts 38, 38 hit the stopper portion 23a, so that the turning ranges of the upper and lower turn base plates 33, 34 are restricted, and thus the turning range of the seat 100 is restricted.

Next, the operation will be described. In the mini excavator equipped with the rotating seat device 10 of this embodiment, even when working with the working machine shaken to the left and right, by rotating the seat 100 toward the work place, the driver can be moved to the work place. Can be paired. Therefore, it is easy to check the left and right situations without rotating the swivel base or forcibly turning the body sideways, and the workability is improved.

In particular, as shown in FIG. 7, the center of rotation L of the seat 100 is arranged in front of the center of gravity HP of the seated person 200, so that the center of rotation of the seat coincides with the hip point. Then, the swing amount Fθ of the front end of the sheet 100 when rotated by the same angle becomes small. Therefore, the amount of shake of the driver's arm also decreases. Therefore, even when the seat 100 is rotated to change the direction of the body, the seated person does not need to swing his / her arm greatly to the left and right, and the operation lever (not shown) or the like can be easily operated accordingly.

Further, since the caster 70 (see FIG. 1) is provided to prevent the seat 100 from bending due to the rotation center L being disposed at a position deviating from the center of gravity HP, the seat 100 can be stably supported. , Rotation support mechanism 2
In combination with the reduction of the load burden on 0, the seat 100 can be smoothly rotated.

Further, a rotary support mechanism 20 for rotatably supporting the seat 100 is provided with an annular flange portion 23 provided on a column 22, and upper and lower turn base plates 33, 34 sandwiching the flange portion 23 so as to be rotatable and slidable. Since the load of the seat 100 is received by the wide surface of the flange portion 23 and the upper and lower turn base plates 33, 34, even if the seat 100 has a biased load, The seat 100 can be stably supported in a state in which it can be easily rotated while preventing the seat 100 from falling. As a result, it is possible to make it durable enough to withstand severe usage conditions.

In particular, between the upper and lower turn base plates 33, 34 made of steel plates and the sliding surface of the flange portion 23, a washer plate 3 made of stainless steel for improving sliding is provided.
Since the sheets 5 and 36 are inserted, the seat 100 can be smoothly rotated, and galling of the sliding surface can be prevented. Further, the stopper portion 23a is provided on the flange portion 23, and the bolt 38 abuts against the flange portion 23 via the collar 40 so as to regulate the rotation range of the seat 100. Therefore, the stopper mechanism that regulates the rotation range of the seat 100. Need not be specially provided.

In the above embodiment, a simple stainless plate was used as the washer plates 35 and 36, but a thrust washer containing a solid lubricant may be used, or a thrust bearing may be used instead. Good.

Further, in the above embodiment, the support column 22 is provided on the swivel base 3 side, and the upper and lower turn base plates 33,
34 is provided on the seat 100 side.
2 may be provided on the seat 100, and the upper and lower turn base plates 33 and 34 may be provided on the swivel base 3 side.

[0025]

As described above, according to the invention of claim 1, even when the seat is rotated to change the direction of the body, the amount of arm deflection that should be swung in the direction opposite to the seat rotation direction. Can be made smaller, and therefore the lever or the like arranged in front of the seat can be easily operated. According to the second aspect of the present invention, the seat cushion can be stably supported, the seat cushion can be prevented from bending, and the seat can be smoothly rotated. In addition, since the support member can prevent an unbalanced load and reduce the load burden on the rotating column, the column can be downsized. According to the invention of claim 3, the same effect as that of the invention of claim 2 can be obtained. According to the invention of claim 4, even though the seat has a simple structure, it is possible to stably support the seat in a state of being able to rotate favorably while preventing the seat from collapsing even when an unbalanced load is applied to the seat. Therefore, even when it is applied to a working machine such as a construction machine, it is possible to provide durability enough to withstand severe usage conditions.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing a rotation support mechanism of the same embodiment.

FIG. 3 is an exploded perspective view showing the seat of the same embodiment.

FIG. 4 is an exploded perspective view showing a structure of a lower portion of the seat according to the same embodiment.

FIG. 5 is an exploded perspective view showing a rotation support mechanism and its peripheral structure of the same embodiment.

FIG. 6 is a plan view of the rotation support mechanism according to the same embodiment.

FIG. 7 is a diagram for explaining the operation of the same embodiment.

FIG. 8 is a perspective view of a mini excavator to which the rotary sheet according to the same embodiment is applied.

[Explanation of symbols]

 L Rotation Center HP Center of Gravity Point 10 Rotating Seat 22 Strut 23 Flange 33 Upper Turn Base Plate (Clamping Plate) 34 Lower Turn Base Plate (Clamping Plate) 70 Casters 100 Sheet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazunori Yamada 650 Jinrachicho, Tsuchiura City, Ibaraki Prefecture Hitachi Construction Machinery Co., Ltd. (72) Inventor Toshio Arai 330 Yura, Ota City, Gunma Prefecture

Claims (4)

[Claims] 1. A rotating seat having a fixed base on which the seat is rotatably mounted, and the center of rotation of the seat is arranged a predetermined distance ahead of a designed center of gravity of a seated person set on the seat. Rotating sheet characterized by. 2. Between the fixed base and the seat,
The rotary seat according to claim 1, wherein a support member that supports the seat and allows the seat to rotate is disposed behind the seat with respect to the center of gravity. 3. The rotary seat according to claim 2, wherein a caster attached to the lower surface of the seat and rolling on the fixed base is used as the support member. 4. A pillar is erected on the fixed base, an annular flange portion is provided on the outer periphery of the pillar, and a pair of sandwiching plates connected to each other above and below the flange portion are rotatable and slidable. The rotary sheet according to claim 1, wherein the sheet is rotatably supported by the sandwiching plate by connecting and fixing the sandwiching plate to the sheet.