JPH0762687A - Lifting gear for driver's cab - Google Patents

Abstract

PURPOSE:To prevent unexpected failing, and to improve safety by mooring a driver's cab to an upper slewing machine body by a falling preventive mechanism when the driver's cab 1 lifted and dowered in the oblique front lowering direction is stopped at an arbitrary position. CONSTITUTION:A driver's cab 1 is installed to an upper slewing machine body 3 in a fitting-lowering-able manner along the oblique front lowering direction by a guide mechanism 12. A slant section 14 is formed to the side section of the upper travelling machine body 3, and two guide rails 16 are juxtaposed to an oblique front lowering slant 15. The driver's cab 11 is disposed onto a moving plate 18, two cylinders 24 for pushing are mounted on the moving plate 18, and brake members 26 are set up to the rods 25 of the cylinders 24. The brake members 26 push the guide rails 16 by the projecting operation of the rods 25 of the cylinders 24 for pushing, thus mooring the driver's cab 11 at an arbitrary position. A falling preventive mechanism 23 is operated at the time of mooring and the driver's cab is moored to the upper slewing machine body 3, thus preventing the unexpected falling of the driver's cab 11 even when a hydraulic hose is flawed laceratedly and a hydraulic pump, etc., get trouble.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, a hydraulic excavator,
The present invention relates to a driver's cab lifting device such as a shovel excavator to which attachments such as a hydraulic crusher and a scrap processor are exchangeably mounted.

[0002]

2. Description of the Related Art Conventionally, in this type of excavator excavator and the like, there is known a structure in which a driver's cab provided with a seat and an operating mechanism vertically moves up and down.

By the way, in recent years, in consideration of the operability of the driver, the expansion of the field of view, the ease of hydraulic piping, and the electrical wiring, there has been provided a structure in which the operator's cab can be moved up and down along the diagonally downward direction and stopped and held at an arbitrary position. Proposed.

[0004]

However, in the case of the above-mentioned conventional structure, a hydraulic cylinder is used for raising and lowering the cab, and the head cylinder and rod side of the hydraulic cylinder are sealed with pressure oil to operate at an arbitrary intermediate position. The structure that stops and holds the cabin has the inconvenience that if the hydraulic hose is torn or the flow path switching valve or hydraulic pump fails, the cab may suddenly fall. Have

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve such inconvenience, and its gist is to provide an upper turning machine body with an upper turning machine body and raise and lower a driver's cab on the upper turning machine body. A guide mechanism that is provided so that it can be guided, and various attachments are attached to the upper turning machine body, and a guide mechanism that can guide the operating room to the upper turning machine body in a diagonally forward and downward direction is provided, and the operation room is moved up and down. Equipped with a lifting mechanism to
The driver's cab lifting device is characterized in that the driver's cab is configured by providing a fall prevention mechanism capable of mooring the upper swing body.

[0006]

[Function] The operator's cab guided by the guide mechanism moves up and down along the diagonally forward and downward direction by the elevating mechanism. At this time, if the operator's cab is stopped at an arbitrary position for elevating and lowering, the operator's cab is prevented by the fall prevention mechanism. Will be moored to the upper swing body.

[0007]

1 to 9 show an embodiment of the present invention, in which 1 is a lower traveling machine body, in which case a crawler belt 2 is provided around the undercarriage, and a lower traveling machine body 1 is provided with an upper revolving machine body 3 as a pivot shaft. It is provided so as to be horizontally rotatable around the portion 4, a boom 5 is projectingly provided on the upper swing body 3 by a hydraulic cylinder 6 so that the boom 5 can be lifted and lowered, and an arm 7 is attached to a tip portion of the boom 5 by a hydraulic cylinder 8 so that it can be lifted and lowered. A bucket as an attachment 9 is attached to the tip of the arm 7 by a hydraulic cylinder 10 so as to be opened and closed.

Reference numeral 11 denotes an operator's cab, which is provided by a guide mechanism 12 so that it can be guided up and down along the diagonal direction to the upper revolving machine body 3 and by an elevator mechanism 13 so that it can be moved up and down.

In this case, the slope 14 is formed on the side of the upper traveling body 3, and the two guide rails 16 are attached in parallel to each other on the slope 15 of the slope 14 at the front of the slope. A total of four bearing parts 17 are fixed to each of the 16 in a non-floating state, and are slidably fitted along the guide rails 16. The bearing parts 17 are attached to the moving plate 18, The operator's cab 11 is disposed on the lower surface 18, and the base of an ascending / descending cylinder 19, which is a hydraulic cylinder, is connected to the lower side of the inclined surface 15 by a pin 20, and the tip of a rod 21 of this ascending / descending cylinder 19 is moved to a moving plate 18 It is configured by connecting with a pin 22 on the upper back surface.

Reference numeral 23 denotes a fall prevention mechanism, and in this case, the moving plate 18 is provided with a pressing cylinder 2 composed of a hydraulic cylinder.
4 are attached, the brake member 26 is attached to the rod 25 of the pressing cylinder 24, and the guide rail 16 is provided so as to be able to be pressed by the brake member 26 by the protruding operation of the rod 25 of the pressing cylinder 24.
When the guide rail 16 is pressed by 6, the driver's cab 11 is provided so as to be moored and held at an arbitrary position by the friction thereof.

In this case, as shown in FIGS. 8 and 9, the three-way switching valve 2
7 and the two-way switching valve 28 are connected to the lifting cylinder 19 and the pressing cylinder 24 to form a circuit. 2 in the figure
Reference numeral 9 is a hydraulic pump, 30 is a hydraulic tank, 31 is an operation switch, and 32 is a diode. At this time, when it is desired to stop at an arbitrary position in the cab 11, the three-way switching valve 27 and the two-way switching valve 28 are used. Is de-energized, the pressure oil on the head side and the rod side of the lifting cylinder 19 is sealed, the rod 25 of the pressing cylinder 24 projects, and the brake member 26 presses the guide rail 16, Friction will hold the cab 11 moored at any position. Further, the pressing cylinder 24 has a circuit configuration that operates only when the hydraulic pump 29 is operating. This is to keep the cab 11 in a raised state when the hydraulic pump 29 or its engine fails. This is to avoid

Since this embodiment has the above-mentioned structure, the operator's cab 11 guided by the guide mechanism 12 is moved up and down along the obliquely forward and downward direction by the elevating mechanism 13, and at this time, any position for elevating and lowering is provided. When the operator cab 11 is stopped at, the operator's cab 11 is moored to the upper slewing machine body 3 by the fall prevention mechanism 23. Therefore, in the unlikely event that the hydraulic hose is torn, the flow path switching valve, or the hydraulic pump fails. Even if it occurs, it is possible to prevent the driver's cab 11 from dropping unexpectedly, and it is possible to improve safety.

At this time, since the fall prevention mechanism 23 is provided with a pressing cylinder 24 capable of pressing and locking the guide rail 16 as the guide mechanism 12, even if the guide rail 16 is worn due to aged use. Even if there is, the rattling of the cab 11 in the stopped state can be prevented by pressing the guide rail 16.

The guide mechanism 12 and the lifting mechanism 13,
The structures of the fall prevention mechanism 23 and the like are not limited to those in the above-described embodiment, but may be modified appropriately for design.

[0015]

As described above, according to the present invention, the operator's cab guided by the guide mechanism moves up and down along the diagonally forward and downward direction by the elevating mechanism. When stopped, the driver's cab will be moored to the upper slewing machine by the fall prevention mechanism.Thus, even if a hydraulic hose is torn or a flow path switching valve or hydraulic pump fails, the driver's cab will remain It is possible to prevent an accidental fall and improve safety accordingly.

As described above, the intended purpose can be sufficiently achieved.

[Brief description of drawings]

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

FIG. 2 is a plan view of the embodiment shown in FIG.

FIG. 3 is a partial side sectional view of the embodiment shown in FIG.

FIG. 4 is a partial plan sectional view of the embodiment shown in FIG.

5 is a partial cross-sectional view of the embodiment shown in FIG.

6 is a partially enlarged cross-sectional view of the embodiment shown in FIG.

FIG. 7 is a partially enlarged side sectional view of the embodiment shown in FIG.

FIG. 8 is a hydraulic circuit diagram of the embodiment shown in FIG.

9 is an electric circuit diagram of the embodiment shown in FIG.

[Explanation of symbols]

 1 Lower traveling machine body 3 Upper swing machine body 9 Attachment 11 Driver's cab 12 Guide mechanism 13 Elevating mechanism 16 Guide rail 23 Fall prevention mechanism 24 Pressing cylinder

Claims (2)

[Claims] 1. An upper slewing machine body is provided on a lower traveling machine body, a driver's cab is provided on the upper slewing machine body so that it can be guided up and down, and various attachments are attached to the upper slewing machine body. A guide mechanism capable of ascending and descending guides along the diagonal forward and downward direction is provided on the machine body, an elevating mechanism for elevating and lowering the cab, and a fall prevention mechanism capable of mooring the cab to the upper swing machine body. A cab lifting device characterized by the above. 2. The cab raising / lowering device according to claim 1, wherein the fall prevention mechanism includes a pressing cylinder capable of pressing and locking a guide rail as the guide mechanism.