JPS58195639A - Elevator for operation chamber of construction machine - Google Patents

Abstract

PURPOSE:To hold an operation chamber at rising positions by a method in which a pair of struts are fixed to the back side of the operation chamber, and a supporting bracket, a vertically movable cylinder, paired guide means, and an operation chamber are provided to a coupling means. CONSTITUTION:A pair of struts 6 are fixed to the back side of an operation chamber 3, and a vertically movable cylinder 8 is attached through a supporting bracket 7 to the operation chamber 3. A pair of upper and lower rollers 9 and 10 as guiders are attached to the supporting bracket 7, a bracket 12 having a coupling groove 12a as a coupler for the operation chamber 3 is fixed to the upper front side of the struts 6, and a coupler piece 11 and a spring 15 are provided to the lower part of the operation chamber 3. When the coupler piece 11 is slid along the inclined face 12b of the bracket 12 while pressed by the spring 15 and pressed into the coupling groove 12a, the operation chamber 3 is stopped and held mechanically at the position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevating device for a driver's cab installed at the front of a revolving body of a construction machine such as a crane or a hydraulic excavator.

The operator's cab installed at the front of the revolving body of construction machinery is operated by attaching the work front to the center of the front of the revolving body.
Depending on the work conditions, it may be necessary to raise the operator's cab to improve visibility. For example, taking the truck crane shown in FIG. 1 as an example, 1 is a carrier as a traveling vehicle body, 2 is a revolving body, 3 is a driver's cab, and F is a boom as a front for work. As shown in Figure 1, when the top of the ship is at a high position during port cargo handling, etc., it is necessary to raise the operator's cabin 3 and perform safe work while checking the position of the suspended cargo. As shown in the figure, when driving on general roads, there are height restrictions, so it is necessary to lower the driver's cab 3 so that the total height H of the vehicle is below the vehicle height limit. Conventional elevating devices include those that raise the operator's cabin by providing a removable platform on the revolving body, as disclosed in Japanese Patent Application Laid-open No. 17887, or as disclosed in Japanese Patent Publication No. 111O9, 1983. For example, there is one in which a pair of cylinder bodies are fixed on a revolving body and the pair of piston rods are extended to raise the operator's cab. In the former case, the platform must be attached and detached each time the driver's cab is raised or lowered, which requires a lot of time to set up, and maintenance must be taken into consideration when the platform is not in use.

The latter uses a cylinder to raise and lower the driver's cab, so it has the advantage of being easy to operate, but since the cylinder body side is used as a guide surface when raising and lowering the driver's cab, there is always a lateral load on the cylinder's main salary. At the same time, two cylinders and a guide bracket are required as reaction force fulcrums, resulting in a complicated structure. In addition, the raised setting position of the operator's cab is maintained by switching the control valve.
There is a drawback that it cannot be maintained for a long time due to oil leakage, etc.

The present invention relates to an improvement of a lifting device for a driver's cab using a cylinder, which allows the driver's cab to be kept within the vehicle height limit during transportation, and to raise and lower the driver's cab with a single cylinder during work and securely hold it in the raised position. The purpose of this invention is to provide a cab elevating device for construction machinery.

In order to achieve this object, the present invention provides a construction machine in which a working front is attached to the center of the front of a revolving body and a driver's cab is installed on the front side. A pair of fixed columns whose dimensions are set within the height of the operator's cab, and a piston rod located between the columns, with the end of the piston rod mounted on the V-frame of the rotating body, and the cylinder body side A lifting cylinder attached to the lower rear side of the driver's cab via a support bracket, six pairs of guide means attached to the support bracket and movable or sliding along the front and rear surfaces of the support column, and a lift for the driver's cab. The locking hand that locks the driver's cab to the pillar at the set position (
,,, 5111 houses. Below, one embodiment of the present invention will be described in more detail with reference to FIGS. 3 to 8. 3 to 7 show the means for lifting the driver's cab 3, and the right frame 4 on the revolving body 2 at the rear side of the driver's cab 3 has dimensions set within the height of the driver's cab 3. The lower ends of the pair of left and right columns 6.6 are fixed, and the upper ends thereof are fixed to the frame 4 via a stay 5 while integrally connecting the columns 6.6 via a connecting member.

A lifting cylinder 8 for lifting the driver's cab 3 is disposed between the columns 6 and 6, and its piston rod 8b end is attached to the frame 4, and the cylinder body 8a side is connected to the driver's cab 3 via a support bracket 7. It is integrally attached to the bottom of the. Therefore, when the cylinder 8 is extended, the cylinder main body 8a, the support bracket 7, and the operator's cab 3 move up as one. The support column 6 is formed of a member having at least U-shaped planes on the front and rear surfaces and the inner surface on the driver's cab 3 side, and has a prismatic cross section as shown in FIG. 7, for example. A pair of upper and lower rollers 9 and 10 are attached to the support bracket as guide means that move along the front and rear surfaces and the inner surface, respectively.

FIG. 8 shows the mechanical holding device of the driver's cab 3 in the raised setting position. As a locking means for locking the driver's cab 3 to the support column 6.6, a locking groove is provided in the upper front surface of the support column 6. A bracket (having a bracket 12a) 12 is fixed, and a locking piece 11 that engages and disengages from the locking groove 12a and a spring 15 that presses the locking piece 11 into the locking groove 12a are provided at the lower part of the driver's cab 3. It is provided. The other end of the locking piece 11 is connected to the lower end of the operating lever 13 which is swingably supported on the floor 3a of the driver's cab 3 via a link 14, and the spring 1
5 movable ends are attached.

FIG. 9 shows an example of an operating hydraulic circuit for the lifting cylinder. Hydraulic pump 1 when not performing lifting/lowering operations.
The oil discharged from 01 goes to circuit 105 and operation valve 103.
, flows to circuit 106. When the operator's cab 3 is raised, when the lever 104 is operated in the A direction, the operating pulp 103 is switched to the A position, and the pressure oil flows from the circuit 105 to the circuit 107 to extend the cylinder 8. When the operator's cab 3 is lowered, when the lever 104 is operated in the opening direction, the operating valve 103 is switched to the opening position, the pressure oil returns from the safety valve 102, and the circuit 107
is connected to the circuit 106, and the pressure oil in the cylinder 8 is released. Therefore, the cylinder 8 contracts due to the weight of the driver's cab 3.

Since the present invention is configured as described above, the lifting cylinder 8
When the driver's cab 3 is extended, the roller 9. is used as a guide means.
Due to the transfer of IO, it rises while being supported by a pair of pillars 6.6. At this time, since the rollers 9 are idlying the pillars 6, 6 from the front and back directions, the vertical inclination of the driver's cab 3,
It can hold vibrations, etc. In addition, since the support columns 6, 6 are angled from the side of the 50-ra 10, the inclination of the driver's cab 3 in the left-right direction can be maintained. Therefore, the driver's cab 3 can be raised stably using one cylinder and a simple guide means. As the driver's cab 3 rises,
As shown in FIG. 8, the locking piece 11 slides along the slope 12b of the bracket 12 while being pressed by the spring 15, and is pushed into the locking groove 12a. Therefore, the upper λ· of the driver's cab 3 is stopped and mechanically held in this raised setting position. As a result, when working with a crane or the like for a long time in this condition, even if the cylinder holding force decreases due to leakage of operating pressure oil etc. in the cylinder as in the conventional case, the operation cab 3 and support column 6. 6, the driver's cab 3 is reliably held in the raised setting position. Furthermore, this locking means has the advantage that by arbitrarily setting the brackets 12 or by providing an arbitrary number of brackets 12, the raised setting position of the driver's cab 3 can be changed or added. When lowering the operator's cab 3 after the work is completed, as shown by the two-dot chain line in FIG. Since the lock with 6°6 is released, the driver's cab 3 is lowered by its own weight. In this case, although not shown, the driver's cab 3 can be slowly lowered by means such as a circuit throttle. In the lowered position of the driver's cab 3 shown by the two-dot chain line in FIG. Since there is no protrusion 11 from the driver's cab 3, the total height of the vehicle or the upper revolving body etc. in the case of disassembly transportation can be kept within the vehicle height limit.

10 and 11 show another embodiment of the guide means disclosed in the present invention, in which slide plates 16 and 17 are attached to the support bracket 7 in place of the rollers 9 and 10. be. With this configuration, the driver's cab 3 can be stably raised by sliding the pillars 6.6 of the slide rails 16 and 17 on the front, rear and side surfaces.

In addition, in the locking means of the present invention, the bracket 12 may be attached to the driver's cab 3 side, and the locking piece 11 and the spring 15 may be attached to the support column 6 side.

As described above, according to the present invention, a pair of pillars whose dimensions are set within the height dimension of the driver's cab in the lowered position, a guide means for raising and lowering the driver's cab along the pillars, and a cylinder body side that is operated The driver's cab can be raised and lowered using a lifting cylinder fixed to the cabin and a locking means for the raised position of the driver's cab, so the height of the vehicle can be kept within the vehicle height limit during transportation, and only one cylinder is needed for work. This has the effect of stably raising the driver's cab with the cylinder and reliably holding the driver's cab in the raised position. There is also the advantage that the structure of the device is simple and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing the working state according to the present invention, and FIG.
The figure is an overall side view showing the transportation state, Figures 3 to 8 show an embodiment of the present invention, Figure 3 is a side view showing the raised position of the driver's cab, and Figure 4 is a guide means. Figure 5 is a front view from the ■-■ arrow direction in Figure 3, Figure 6 is a front view showing the cylinder when it is contracted, and Figure 7 is a view from the -■ arrow direction in Figure 5. 8 is a partially enlarged sectional view showing the locking means; FIG. 9 is an operating hydraulic circuit diagram according to the present invention; FIG. 1O is an enlarged sectional view showing another embodiment of the guide means; FIG. 11 is a partially sectional bottom view taken along the line XI-XI in FIG. 10. 2... Revolving body, 3... Driver's cab, 4... Revolving body frame, 6... Support column, 7... Support bracket, 8...
・Cylinder for lifting, 8a... Cylinder body, 8b...
・Piston rod, 9...Roller as a guide means,
11... Locking piece, 12... Bracket, 12a...
-Latching groove, 15...Spring, F...Front for work. vn3W! AV- Figure 4 198- Figure 5 Figure 7 Figure 8'@9 Figure 1O Figure 11

Claims (1)

[Scope of Claims] 1. In a construction machine in which a working front is attached to the center of the front of a revolving structure and a driver's cab is installed on the front side, the construction machine is fixed to a position on the rear side of the operator's cab on the revolving structure, and a pair of columns whose dimensions are set within the height of the operator's cab, and the piston rod is located between the columns, and the end of the piston rod is attached to the revolving body frame, and the cylinder body side is connected to the operator's cab via a support bracket. a lifting cylinder attached to the lower rear surface of the column; a pair of guide means attached to the support bracket and moving or sliding along the front and rear surfaces and inner surfaces of the column;
A driver's cab elevating device for construction machinery that is similar to a locking means for locking the driver's cab to a support when the driver's cab is in the raised setting position. 2. The driver's cab locking means includes at least one locking groove;
A construction machine according to claim 1, characterized in that the construction machine comprises a locking piece that locks and disengages from the locking groove, and a spring that presses the locking piece into the locking groove. Driver cab lifting device.