JPS594600A - Platform for approach - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates, although not essentially, to a class A access platform that is typically mounted on a vehicle and used for accessing equipment or personnel to a well-lit location above ground level. This type of device comprises a rotating base mounted with an articulated boom device, said boom device consisting of two or more units pivotably connected end to end. booms and hydraulically actuated cylinders for pivoting the booms about a horizontal axis relative to each other and relative to the rotating platform.

Regulations governing the manufacture and use of this type of device require that all devices must be used to prevent the boom from being operated into a position where the stability of the vehicle is reduced to the point of a dangerous turn that could, in extreme cases, cause the vehicle to overturn. It is said that Yasugi can do it. To prevent this, many devices have been devised, such as complex restraints that actuate control valves to prevent further movement when the boom approaches a potentially unstable condition. Ta. Such devices are prone to failure, are expensive to maintain, and can be damaged during use of the instrument.

In another device, the second boom is automatically raised relative to the first boom when the first boom is raised, and the boom is extended vertically to its fullest extent so that both booms are fully extended horizontally. A correction mechanism is provided to prevent this from extending. In this way, the center of gravity of the boom device is kept within the support structure, which in the case of a vehicle is a set of ground-engaging jacks extending from the platform of the vehicle and contacting the ground.

The object of the present invention is to provide a compensation mechanism that naturally maintains the stability while also allowing the boom to provide easy access to the platform for the operator. and provide an access platform designed to reduce the length of the boom in the retracted or traveling condition.

According to the invention, the articulated boom device is mounted with force;
an access platform with a turntable having two or more booms interconnected such that the boom device can pivot substantially end-to-end;
In the approach platform, which is provided with hydraulically actuated cylinders for all sides of the boom and for pivoting about the horizontal axis with respect to the turntable, the navy blue 1 boom, the lower boom, is shaped like a parallelogram. Link trick 9
, a bracket assembly in which one end of the link device is pivotally connected to the rotary table, and the other end of the link device maintains a constant attitude regardless of the lifting angle of the front subordinate boom. , a second boom is pivotally connected to the bracket assembly, and a hydraulically actuated cylinder for the second boom is disposed between the second boom and the bracket assembly. An access platform is provided that is characterized in that it is connected.

Hereinafter, one embodiment of the present invention will be described with reference to all the accompanying drawings.

This platform is shown 7 in the illustrated embodiment as being mounted via a turntable 10 on the deck or chassis 11 of the vehicle, generally designated I2. This vehicle has a jack 13' that engages the 1 & 1 ground which is lowered when raising the approach platform.
I'm doing it.

This access platform has a first boom, generally designated I4, which is connected to a rotating platform 10.
It consists of a pair of elongated parallel members 15 and 16 pivotally mounted at spaced apart positions on the -L side portion 17 of the main body, and carrying a bracket 18 at the free end of the members 15,16.

The brackets 15 and 16 are likewise pivotally connected to the bracket 18. Therefore, the upper part 17,
Members 15 and 16 and bracket 18 constitute a parallelogram linkage. A hydraulically actuated cylinder 19 running between the upper part 17 and the boom 14 is extended to raise the boom 14'f relative to the turntable 10.

A second bracket fixed to the bracket 18)2
0 is the second boom, and I:, and the second boom 21 is the bracket +:2o, which carries one end of the side boom 2I.
It is connected so that it can pivot to the east. A hydraulically actuated sill 22 extends between the boom 21 and the bracket assembly 18.20 and extends to allow the second boom 21 to be raised relative to said bracket assembly.

An access cage or working platform 23 is pivotally attached to the free end of the second boom 21 .

A device (not shown) is provided to hold the cage 23 horizontally with respect to all configurations of the boom assembly.

The device is arranged with the lower boom 14 arranged horizontally and the upper boom 2 tilted downward from its free end so that the cage 23 is arranged in a position easily accessible to the operator, i.e. in a traveling position. This is an indication.

If the hydraulic cylinder 19 is extended from the traveling position, the lower boom 14 is operated to the full position A, and the brackets 18, 20 remain in a constant position in space due to the parallelogram configuration of the boom 14. maintain. The upper boom 21 therefore occupies position B2. When the lower boom 14 is fully raised, the upper boom 21 is activated by the hydraulically actuated cylinder 22.
By extending RCk, it is further raised and can be moved to the maximum raised position through position RCk.

In another operation, the hydraulic cylinder 19 is held closed while the hydraulic cylinder 22 is extended and the upper boom 21
is raised to position E.

Extending the hydraulic cylinder 19 then causes the lower boom 14 to rise to position tlt, A, with the upper boom 21 occupying position D-2.

If both hydraulic cylinders 19 and 22 are raised simultaneously from their running position, the cage 23 can be raised in a substantially straight line in the vertical direction.

Furthermore, by placing the hydraulic cylinder 22 in a position other than the maximum closed position in the travel position, the cage 23 further closes the hydraulic cylinder 22 even when the lower boom 14 is raised from its travel position. In particular, it can be held in its lowest position.

The geometry of this device is such that the hydraulic cylinder 22 is connected between the upper beam 21 of the parallelogram linkage and the bracket assemblies 1g, 20.
2 is held in the retracted condition, thus the second boom 21
It now requires a substantially constant hydraulic pressure to raise the This feature allows the use of an actuating cylinder of lighter construction than is normally required for this type of device. Typically, the actuating cylinders for an upper set of pools are connected between two booms, and with such an arrangement it is not possible to obtain a substantially constant hydraulic pressure.

Placing the upper boom 21 alongside the lower boom 14 allows the cage 23 to be lowered to a position easily accessible to the operator, thereby minimizing the overall length of the device in the transport position. I can do it.

In this type of device, in which the raising of the second boom, ie the upper boom 21, takes place automatically when compensating for the raising of the first boom, ie the lower boom 14, the boom 14.21 This allows the boom 14.21 to occupy an almost vertical position at its maximum height without the risk of excessive overturning moments with maximum horizontal extension on one side or the other. . Maximum height is obtained by configuring the boom 14.21 to extend straight at maximum height, and
The length of the boom 14.21 is kept to a minimum, so that the overall length of this structure in the driving position is minimized, with the bracket 18,2C1j being arranged above the driver's cab of the vehicle.

[Brief explanation of the drawing]

The accompanying drawings are schematic diagrams illustrating access platforms incorporating features of the present invention. 10... Turntable, 11... Chassis, 12... Vehicle, 12... Jacket, 14... First boom, 15.
16...Parallel member, 17...Upper part, 18...
・First bracket, I9...Hydraulic pressure operated cylinder, 20
...Second bracket, 21...Second boom, 22.
... Hydraulic actuation cylinder, 23... Working platform. Taganhito Simon Engineering Dasodorei Limited Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Heimoto Patent Attorney Akira Matsumoto

Claims (1)

Claims: 1. An access platform with a rotating base mounted with an articulated boom assembly, the boom assembly being reciprocally arranged such that the boom assembly can pivot substantially end-to-end. an access system comprising two or more booms connected together and a hydraulically actuated cylinder for swinging the booms about a horizontal axis relative to each other and relative to the rotating platform; On the platform, if the first boom, i.e. the lower boom, is not a parallelogram linkage,
A bracket assembly in which one end of the linkage is pivotally connected to the rotary table, and the other end of the linkage maintains a constant attitude regardless of the lifting angle of the lower boom. Yes, there is also a second boom, that is.
two side booms are pivotally connected to the bracket assembly, and a hydraulically actuated cylinder for the second boom is connected between the second boom and the bracket assembly; Features an approach platform. 2. In the access platform according to claim 1, when the lower [11 boom, that is, the first boom extends substantially horizontally, the second boom is
The booms are coupled together such that the booms can be tilted downwardly from the booms such that the outermost ends of the boom assemblies are maintained at a lower level than the bracket assemblies. access platform. 3. The access platform according to claim 1, wherein an access cage or a working grout is pivoted to the outermost end of the boom assembly. An access platform comprising a foam and a device for keeping the cage of the platform horizontal at all times with respect to any position of the boom assembly. 4. In the approach platform according to any one of claims 1 to 3, the hydraulic actuation cylinder for the second boom is held in a retracted state and the second boom is fully raised. An access platform characterized in that a substantially constant hydraulic pressure is required for the access platform. 5. In the approach platform according to any one of claims 1 to 4, the second boom is attached to the lower boom, that is, the first boom, in parallel;
An access platform 3.6, all characterized in that it allows the outermost end face of the second boom to be lowered to a level below the level of the bracket assembly. An access platform according to any of clauses 1 to M5, wherein the bracket assembly comprises a first bracket to which a parallelogram linkage of the lower boom is pivotally connected in a spaced position; a second bracket secured to the plug and pivotally supporting the second or upper boom, a hydraulically actuated cylinder for the second boom being coupled between the second boom and the second bracket; An approach platform characterized by: 7. In the approach planton ohm according to any one of claims 1 to 6, the rotary table is mounted on the deck or chassis of the vehicle toward the rear end of the vehicle, An access platform characterized in that the boom assembly and the entire bracket assembly are capable of being bent into a travel position in which the entire bracket assembly is disposed above the driver's cab.