JP2556728Y2 - Cabin for construction machinery - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cabin of a construction machine such as a hydraulic excavator or a civil engineering machine, and more particularly to a structure for mounting an operator's seat in the cabin.

[0002]

2. Description of the Related Art FIG. 2 shows the appearance of a general hydraulic excavator. An upper revolving unit 3 is mounted on a lower traveling unit 2 via a swing frame 5 so as to be pivotable.
A front 1 is mounted in the center of the front of the vehicle, and a cabin 4 is installed on one side thereof. The upper revolving superstructure 3 has a function of turning 360 °, and the lower revolving superstructure 2 has a traveling function of forward / backward movement, spin turn and pivot turn.

[0003] Cabin 4 is placed on the cab support portion 9 of the front one side of the swing frame 5 as shown in FIG. That is, the cab support portion 9 has four support brackets 10, and a cab floor 7 having mounting holes 8 corresponding to these support brackets 10 at four corners is placed on the cab support portion 9, and the mounting holes 8 pass through the mounting holes 8. After being screwed, the cabin 4 body is
Fixed to

FIG. 4 shows the details of the mounting structure of the cabin 4 to the swing frame 5. A ring-shaped mount rubber 17 is sandwiched around a hole of a support bracket 10 provided in a cab support section 9 of the swing frame 5. Caps 21 are attached to the upper and lower sides of the bosses 15 and are brought into contact with the bosses 15 which are welded to the lower surfaces of the mounting holes 8 of the cab floor 7.
And the bolt 33 is inserted through the mounting rubber 17 and
The cab floor 7 is attached to the swing frame 5 by tightening the nut 20 from below through the washer 19. Reference numeral 18 denotes a collar for giving a predetermined interval to the upper and lower caps 21. On the other hand, a rib 12 is extended and fixed to the lower inner surface of the main body 11 of the cabin 4, and the rib 12 is mounted on a boss 12 b which is welded to the upper surface of the cab floor 7 and has a thread cut at the center, and a washer 13 is mounted. And is fixed by bolts 14. Thus, the cab body 11
Is fixed to the swing frame 5 together with the cab floor 7. Reference numeral 16 denotes a rubber weather strip inserted between the cab body 11 and the swing frame 5 before assembly.

[0005] sheet 26 as shown in FIG. 5 as an example in the center of the cab floor 7 in the cabin 4 is mounted. The seat 26 is provided with a suspension section 34 mounted on a base 22 bolted up on the cab floor 7.
Cushion 27 that is mounted on the
, Armrest 24, back 25, headrest 36
And an adjuster 23. The cabin 4 has a operation station, the lever 2 to other manually operated operator in the seat 26 as shown in FIG. 6
8 are provided.

[0006] The suspension section 34 of the sheet 26 7
As shown in FIG. 7 (a), a so-called "a type" comprising a parallel link 32 and a spring 31 for connecting the base 22 and the lower part of the cushion 27, and connecting the base 22 and the lower part of the cushion 27 as shown in FIG. There is a type referred to as a b type including an X-link 30 and a spring 29.

[0007]

A conventional earth-moving machine such as a hydraulic shovel having the above-mentioned structure suffers severe vibration during work or running, so that the following problems occur. 1) Usually, the cab floor 7 supporting the cabin 4 to cope with this vibration has four corners supported by rubber springs such as a mounting rubber 17 and a weather strip 16 as shown in FIG. When these rubbers are softened to lower the spring constant to effectively absorb vibration,
When the shovel receives lateral vibration, there is a risk that the cabin 4 will swing sideways and hit the boom of the front 1 adjacent to the cabin, so that there is a restriction that soft springs cannot be used, so that the vibration can be effectively absorbed. Can not. 2) On the other hand, the suspension portion 34 of the seat 26 has a structure as shown in FIG. 8 and is therefore effective against vertical vibrations, but cannot absorb any vibrations against lateral loads. Rather, harmful sounds and vibrations are secondarily generated due to the play of the spring support mechanism. Further, as shown in FIG. 7, since the lever 28 and the seat 26 are individually fixed to the cab floor 7, there is a difference between the vertical movement of the seat and the vertical movement of the lever, and the positional relationship between the two changes. Have difficulties.

[0008]

According to the present invention, to solve the above-mentioned problems, a seat on which an operator sits is provided;
The platform is its four provided a lever and a pedal operated by an operator on the integrated platform
In the corner, between the two arms
Spring and shock absorber arranged upward and inward
Supported on the cab floor by a link mechanism with
The platform, including the operator
The four shock absorbers above the center of gravity of the form
From the point corresponding to the intersection of the central axes of
Construction machine cabin, characterized in that have been made as has are provided.

[0009]

[0010]

According to the present invention, as described above, the seat, the operating lever and the pedal are mounted on an integrated platform whose four corners are supported on the cab floor. Even if the platform moves, it shows the same behavior on the platform, and there is no relative position change between each, so that there is no hindrance to steering.

[0011] Oite to this devised a horizontal movement with the platform absorb vertical movement because it is supported by a link mechanism having a spring and a shock absorber disposed above inwardly at four corners to the cab floor Therefore, the rigidity can be increased, and the deformation due to the lateral load on the cab floor can be reduced.

[0012]

Next, an embodiment of the present invention will be described. Cab floor 7 as in the conventional Figure 3, mounted on the swing frame 5 in a manner shown in FIG. 4, are attached to the cab body 11.

As shown in FIG . 1, in one embodiment of the present invention,
Link machines installed at four locations on the cab floor 7
The platform 41 is supported by the frame 48. Link
The mechanism 48 includes two arms pivotably connected to each other.
A spring 49 and a shock absorber for connecting these arms
And a bus absorber 50. Spring 49 is shock
The bush 50 is concentrically surrounded by two arms of the link mechanism 48.
Acts in the direction that expands the
The longitudinal axis of the absorber 50 is arranged at an angle that points upward and inward.
Is placed. Platform 41 is low in the center
The left and right sides stand up, and the link
Before the flange for attaching the upper end of the locking mechanism 48 is formed
The rest is open. Platform 41
Two pedals 4 in front of the low level flat
5 is provided, and a base 46 is welded to the center of the flat part.
Have been. The suspension unit 3 of FIG.
The portion of the sheet 26 excluding 4 is bolted. However
If the vertical vibration of the machine is extremely
Between the seat 26 and the table 46 to reduce the impact
High horizontal rigidity and effectively absorbs only vertical vibration
A suspension portion may be provided. In this case operet
Between the operation pedal and lever of the motor and the seat 26.
Relative movement, but the amount is
Of the suspension of the seat 26 without using
It is much less than when only vibration is absorbed.

In this embodiment, the shaft of the shock absorber 50 is
The line is the platform including the operator as shown in FIG.
41 so as to intersect at one point P above the center of gravity
The platform 41 thus moves around the point P
External force transmitted to the cab floor 7
Automatically recovers from horizontal vibrations caused by
It can have the same function as the original.

[0015]

The pedal 45, the lever 43, and the seat 26 are mounted on the platform 41, and these have the same behavior. Therefore, there is no relative displacement with respect to each vibration generated on the cab floor 7, and the operation of the operator can be performed. It will be easier.

Since the platform 41 is supported by a link mechanism 48 having a spring 49 and a shock absorber 50 disposed at four places inwardly upward with respect to the cab floor 7, the platform 41 is transmitted to the cab floor 7. The vertical vibration and the horizontal vibration of the sheet 26 caused by the external force can be effectively absorbed. Cabin 4
The ride comfort of the operator who operates with is improved, and the maneuverability is also improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a support state of a platform according to an embodiment of the present invention.

FIG. 2 is a side view showing the entire appearance of a general hydraulic excavator.

FIG. 3 is an exploded view before assembling the cabin to the swing frame.

FIG. 4 is an enlarged partial sectional view showing a method of fixing a swing frame, a cab floor, and a cab body.

FIG. 5 is a perspective view of a conventional operator seat.

FIG. 6 is a perspective view showing an arrangement of a seat and an operation lever in a conventional cabin.

7A and 7B are side views of a conventional operator seat, wherein FIG. 7A shows a seat having an a-type suspension portion, and FIG. 7B shows a seat having a b-type suspension portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front 2 Lower traveling body 3 Upper revolving superstructure 4 Cabin 5 Swing frame 7 Cab floor 26 Seat 41 Platform 43 Lever 45 Pedal 48 Link mechanism 49 Spring 50 Shock absorber

Claims (1)

(57) [Scope of request for utility model registration] 1. A seat (26) seated by an operator, a lever (43) and a pedal (4) operated by the operator.
5) are provided on an integrated platform (41), and the platform (41) has two
Arms and arranged upwardly inward between the arms
Spring (49) and shock absorber (50)
Cab floor (7) by link mechanism (48) having
Supported on the platform, the platform (41)
Four above the center of gravity of the platform containing the
Corresponds to the intersection of the central axis of the shock absorber (50)
From one point (P) as if they were supported
Construction machine of the cabin, characterized in that there.