JPS6017519Y2 - Ladder vehicle for working at heights - Google Patents

Description

[Detailed description of the invention] The present invention relates to a ladder truck for work at height, and more specifically to a device convenient for use in work at height when constructing and repairing ships, aircraft, buildings, etc. .

Previously, work vehicles intended for work at heights were generally equipped with a telescoping ladder above the chassis and a work platform installed at the tip of the ladder, and were often lifted and lowered using steps made of steel pipes, but this was said to be dangerous. There was a problem.

Although there are improved versions of the above-mentioned devices, they tend to be mechanically complex, and a sufficiently strong and safe device has not yet been realized.

Furthermore, a structure in which the stairs are fixed to the boom has many inconveniences in terms of manufacturing and maintenance.

The present invention has been devised in view of the above, and aims to eliminate the above-mentioned inconveniences, and to realize a working ladder truck that is safe during ascending and descending and during work, and is mechanically robust.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view illustrating the outline of the entire apparatus. A swivel base 2 is mounted on a vehicle 1, and a swivel support 3 is erected on the swivel base 2.

A main boom 6 is integrally fixed to a bracket 5 which is pin-coupled to the swing column 3 by a mounting portion 4.

The main boom 6 is arranged in a hollow body, and a telescopic boom 7 is inserted into the hollow body and is telescopically driven by a built-in telescopic jack (not shown).

Reference numeral 8 denotes an elevating cylinder, which is suspended between the swing column 3 and the main boom to perform an elevating operation of the main boom.

Reference numerals 9a and 9b are a pair of balance cylinders, and by communicating oil passages, the workbench 10 is always held horizontally without being affected by the elevation angle of the main boom 6.

Note that the workbench 10 is attached to the tip of the telescopic boom 7 and is equipped to be movable in response to the telescopic boom.

11 is a staircase for going up and down, and is connected to a landing 12.

13 indicates the base of the main boom.

14 is a telescopic staircase that moves together with the telescopic boom;
5 is a fixed staircase equipped at the top.

The fixed staircase 15 has its base end 15', 15'' connected to the swing support 3.
The roller 2 of the main boom 6 is
8, and is configured such that the telescopic stairs 14 can appear and retract.

Both the telescopic staircase and the fixed staircase are constructed by connecting a parallel link member 19 with pins between an upper girder 17 made of channel steel and a lower girder 18, as shown in the partial perspective view shown in FIG.
By providing the plate-shaped tread plate 20 fixed to the main boom, the plate-shaped tread plate 20 is kept horizontal regardless of the elevation angle of the main boom.

The details of the above-mentioned staircase portion will be explained using the AA arrow view in FIG. 3 and the BB arrow view in FIG. 4.

A telescopic boom 7 is inserted into the main boom 6, and rollers 23, 2 of the telescopic staircase are installed at one rear end of a guide rail 22, 22 laid on a support base 21 fixed to the main boom 6.
3 is fitted, and the telescopic staircase 14 is installed so that it can freely slide.

(See Figure 4) The roller 2-3 is the lower girder 18 of the telescopic staircase 14.
and the support beam 24, and the pin connection 2
5, it rolls.

In this embodiment, the guide rail 22, the support beam 2
4, the roller 23, and the like form a first guide mechanism.

The telescopic staircase 14 includes a lower girder 18, an upper girder 17, and a parallel link member 1.
9. As mentioned above, it consists of the plate-shaped step board 20, and the tip of the lower girder 18 is rotatably connected to the tip of the telescopic boom 7, and the tip of the upper girder 17 is rotatably connected to the workbench 10. ing.

On the other hand, as shown in the A-A arrow view of FIG. It is supported on the telescoping staircase 14 by a second guide mechanism consisting of rollers 27 that can be engaged.

Therefore, the fixed staircase 15 is supported by the main boom 6 via the telescopic staircase 14, and the rolling of both rollers facilitates the telescopic driving of the telescopic staircase 14.

The structure of the upper girder, lower girder, parallel link members, plate-shaped treads, etc. constituting the staircase is completely the same as that of the telescopic staircase 14.

FIG. 5 is a top view of the vicinity of the rear of the vehicle, showing the stairs 11 for ascending and descending provided on both sides of the vehicle. This figure shows the positional relationship in which the landing 12 and the base end sides 15' and 15'' of the fixed staircase 15 are connected with pins.

That is, 15' is the connection part of the upper girder, and 15'' is the connection part of the lower girder.

The present invention relates to a ladder for working at heights having the configuration described in detail above, and its use will be briefly described below.

By driving and extending the elevating cylinder 8 whose one end is supported on the swing strut 3, the receiver leaves the platform 13 and rotates upward while the main boom 6 fixes Tm to the swing strut 3.

Next, after rotating the swivel platform 2 to determine the direction, the telescopic boom 7 is extended by driving a built-in telescopic jack (not shown), and the integrated work platform 10 is extended to perform the desired work. Approach the scene.

At this time, the oil passages of the balance cylinders 9a and 9b are communicated with each other, so the more the main boom 6 moves upward, the more the balance cylinder 9a extends, and conversely the balance cylinder 9b shortens, and the levelness of the workbench 10 is reduced. It is maintained.

Looking at how to fix the rear ends of the two pairs of stairs, first, the telescopic stairs 14
The tip of the main boom 6 is directly connected to the telescopic boom 7 and the workbench 10, and is supported by the main boom 6 via a guide rail 22. Fixed stairs 1
5 is characterized in that its one end sides 15', 15'' are directly supported by the pivot support 3, and the fixing means for both stairs are so to speak independent pin joints.

Therefore, when the main boom 6 is raised or raised, there is no strain on the expansion and contraction and the fixed image stairs, and an extremely natural operating state can be obtained.

In addition, since the one side ends 15', 15' of the fixed staircase are pivoted directly to the swinging support, there is no gap between the fixed staircase and the swinging support, and the operator can always reach the landing 15 of the swinging support without any worries. It is possible to move onto the fixed stairs 15.

The problem when moving from fixed stairs to retractable stairs is that especially when the boom is close to horizontal, there is a step difference between both the fixed and retractable stairs and you have to go down one step, giving a shock to the retractable stairs. Since the telescopic staircase is supported by the fixed boom with the rollers 28, no bending force is applied to the telescopic staircase, so there is no deflection or vibration on the telescopic staircase, and the operator can easily move the telescopic staircase from the fixed boom. You can move up and down the stairs safely.

Furthermore, since the telescopic staircase 14 is directly connected to the workbench 10, communication between the two is smooth and it is possible to move onto the workbench 10 safely.

In this way, the worker can safely walk to the workbench 10 via the ascending/descending stairs 11, the landing 12, the fixed stairs 15, and the telescopic stairs 14, and perform high-place work that requires waist movement.

The hydraulic system includes a rotation cylinder (not shown), an elevation cylinder 8, balance cylinders 9a, 9b1, and a telescopic jack cylinder (not shown) of the swivel table 2, and these operations are performed on the work table 10, the swivel table, or It is operated nearby.

However, the same operations at different locations are of course interlocked with each other.

This device has a lower girder 18, an upper girder 17, and a parallel link member 19 that constitute each staircase, and the plate-like tread 2 is always
Since the height of the boom is maintained horizontally according to the ups and downs of the boom, it is extremely safe for workers to go up and down.

The parallel link member 19 has a right-angled triangular shape, and the upper and lower girders are pin-connected to its two acute corners, and a plate-shaped tread is attached to the lower side of the right-angled triangle. The platform can be lowered until it touches the ground.

Therefore, equipment and parts can be loaded onto the workbench directly from the ground, and parts removed from the workpiece can be directly lowered onto the ground.

Furthermore, since the fixed staircase 15 and the retractable staircase 14 are attached using rollers and pin connections, the boom and each staircase are manufactured in completely different manufacturing processes, and are attached to the main body by pin connections during assembly. Since it is assembled, it has the advantage that it is easy to assemble and does not cause strain on the device.

During maintenance, it can be easily disassembled by simply operating the pins, and during repairs, each component can be repaired in separate steps.

Moreover, in combination with the fact that each staircase 14, 15 is directly connected to the telescopic boom 7, the workbench 10, and the swing column 3, both fixed and retractable stairs can be smoothly extended and contracted when the telescopic boom is extended and contracted, and the fixed and retractable stairs can be firmly attached. On the other hand, the load on the workbench 10 can be fully supported by the main boom 6 through the telescopic boom 7, so the support of the workbench is strong and no load is placed on the ladder parts, making it safe and easy to ascend and descend. To realize a ladder vehicle for working at heights, which has great practical value in combination with safety during operation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view illustrating the overall outline of the device, FIG. 2 is a partial perspective view,
Figure 3 is an A-A arrow view in Figure 1, and Figure 4 is the same <B-B.
The arrow view and FIG. 5 show a partial top view showing the rear part of the vehicle. 1... Vehicle, 2... Turning platform, 3...
...Swivel strut, 5...Bracket, 6...
...Main boom, 7...Telescopic boom,
... Elevation cylinder, 9a, 9b ... Balance cylinder, 10 ... Workbench, 11 ... Lifting stairs, 12 ... Landing, 13・・・・・・Base is base, 14・・・Extendable stairs, 15・・・Fixed stairs, 17・・・Upper girder, 18・・・Lower girder, 19...Parallel link member, 20...
Plate-shaped tread, 21... Support stand, 22...
... Guide rail, 23 ... Roller, 24.
...Support beam, 26...Bracket, 27
, 28... Laura.

Claims (1)

[Scope of utility model registration request] A main boom that is attached to a swing column that can be rotated on a work vehicle so as to be able to rise and fall freely, a telescoping boom that is attached to the main boom so that it can extend and contract in its length direction, and a workpiece that is attached to the tip of the telescoping boom. a base, a telescoping staircase disposed on the main boom and connected to the telescoping boom, and a fixed staircase connected to the swing column, the end of the telescoping staircase being rotatably connected to the telescoping boom. and an upper girder which is disposed on the lower girder and whose tip is rotatably connected to the workbench, and the fixed staircase has a base end which is rotatable to the swing column. The lower girder and the upper girder connected to A ladder truck for high-altitude work, characterized in that first and second guide mechanisms are provided between the two to regulate the distance therebetween and allow relative movement.