JP3414888B2 - Self-propelled aerial work platform - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled aerial work vehicle provided with an outrigger jack having a grounding wheel. 2. Description of the Related Art A self-propelled aerial work vehicle equipped with an outrigger jack with a grounding wheel is mounted on a chassis frame 3 behind a driving cab 2 of a truck carrier 1 as shown in FIGS. The work table 7 is attached to the base frame 4 attached to the work table via the swivel table 5 and the boom 6. Outrigger jacks (outrigger jacks having a grounding wheel at the lower end) 8, 8, ... are arranged at front, rear, left and right positions of the base frame 4. 9a, 9a are left and right front wheels (for steering) of the truck carrier 1, 9b, 9b
Are the left and right rear wheels (for driving) of the truck carrier 1.
The truck carrier 1 can control traveling drive, steering, and braking from a traveling cab 2. As is well known, a main braking device 10 is provided to brake the wheels 9a, 9a, 9b, 9b from the driving cab 2 during traveling. This main braking device 10 is shown in FIG.
The left and right front wheels 9a, 9a and rear wheels 9b, 9b as shown in FIG.
, A main brake pressure generating unit 14 controlled by a brake pedal 13 disposed in the driving cab 2, and braking generated by the main brake pressure generating unit 14. It is constituted by a fluid pressure line 15 for transmitting pressure to the fluid actuator 12 of each wheel brake mechanism 11. [0004] This type of self-propelled aerial work vehicle is equipped with a grounding wheel 8 of each of the outreach jacks 8 at a work site.
a, 8a are grounded and the track carrier 1 is stabilized, and the swivel 5 and the boom 6 are operated to perform high-altitude work. Maintenance and maintenance of structures and equipment such as roads or bridges are performed. They are heavily used for inspection. When working at heights, the outrigger jacks 8, 8,... Are driven while traveling on the road surface while the grounding wheels of the outrigger jacks 8, 8,. ) And a high place work (hereinafter referred to as a non-self-propelled high place work) performed by stopping the track carrier 1 with the grounding wheels of the outrigger jacks 8, 8,. [0005] Self-propelled high-altitude work requires truck carrier 1
The work platform 7 can be moved along the road surface by self-propelled operation, so that the work platform 7 is used for a wide range of high-altitude work. Used for high-place work requiring In non-self-propelled high-altitude work, a parking brake (not shown) generally provided on the truck carrier 1 is operated to prevent the truck carrier 1 from escaping. This parking brake brakes the left and right rear wheels 9b, 9b, which are driving wheels of the truck carrier 1. In this type of self-propelled aerial work vehicle, the track carrier 1 is provided by grounding the grounding wheels 8a of the outreach jacks 8, 8,. The grounding of the grounding wheels 8a, 8a,... Is performed by the grounding so that the truck carrier 1 can run on its own for high-altitude work with self-propelled operation. , 9b are grounded to the extent that they do not float. For this reason, when a tipping moment acts in the direction of tipping the track carrier 1 sideways when working at height, when one of the front wheels and the rear wheels (the left and right front wheels 9a, 9a and the rear wheels 9b, 9b are inverted). The front wheel 9a and the rear wheel 9b) on the side have a characteristic that they tend to float. In the non-self-propelled high-altitude work, when the front wheel 9a and the rear wheel 9b on the inverted side of the left and right front wheels 9a, 9a and the rear wheels 9b, 9b are in a floating state, the truck carrier 1 is operated to prevent escape. There is a problem that the function of preventing the escape of the track carrier 1 by the parking brake (braking only the left and right rear wheels 9b, 9b as described above) is halved. In particular, there is a danger that the truck carrier 1 will run off on a slope or the like even though the parking brake is operated. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of a self-propelled aerial work vehicle having an outrigger with a ground wheel. A self-propelled aerial work vehicle according to the present invention comprises left and right front wheels 9a, 9a and rear wheels 9b, which are components of a main braking device 10 when performing non-self-propelled aerial work. The wheel brake mechanism 9b is used to brake all wheels of the truck carrier 1 and has the following configuration. That is, a work table 7 is mounted on a base frame 4 mounted on a chassis frame 3 behind the driving cab 2 of the truck carrier 1 via a swivel base 5 and a boom 6, and a grounding wheel is provided at a lower end portion. The outrigger jack 8 having the outer frame 8a is disposed at the front, rear, right and left positions of the base frame 4, and
Front of the rack carrier so that the front and rear wheels do not float
Self-propelled with the grounding wheel grounded and self-propelled on the road surface
Combined high-altitude work and stopping the truck carrier
A self-propelled aerial vehicle that performs non-self-propelled aerial work , wherein the truck carrier 1 is disposed on left and right front wheels 9a, 9a and rear wheels 9b, 9b, respectively, and a wheel brake mechanism operated by a fluid actuator 12 is provided. 11, main brake pressure generating means 14 controlled by a brake pedal 13 disposed in the driving cab 2, and the braking pressure generated by the main brake pressure generating means 14 is applied to each of the wheel brake mechanisms 1.
Hydraulic line 15 for transmission to one fluid actuator 12
The main brake device 10 includes a main brake device 10 and is connected to a hydraulic line 15 of the main brake device 10 and is operated by a brake pressure applied to the fluid actuator 12 of each of the wheel brake mechanisms 11 via the hydraulic line 15 during operation. And the auxiliary brake pressure generating means 17 which is disposed at an appropriate position of the self-propelled aerial work vehicle and is not self-propelled
Non-work at the time of self-propelled aerial work platforms in combination to create dynamic control at the time of aerial work platforms
A self-propelled aerial work vehicle, comprising: an auxiliary braking device 16 including an operation means 18 for performing dynamic control . In the self-propelled aerial work vehicle according to the present invention constructed as described above, the auxiliary brake pressure generating means 17 is operated by operating the operating device 18 of the auxiliary brake device 16, and the auxiliary brake Since the brake pressure is applied from the pressure generating means 17 to the fluid actuator 12 of each wheel brake mechanism 11 via the fluid pressure line 15, all the wheels of the left and right front wheels 9a, 9a and the rear wheels 9b, 9b are braked. Because For this reason, even when the front wheel 9a and the rear wheel 9b on one side float during non-self-propelled work at a high place, the left and right rear wheels 9b, 9
The function of preventing the track carrier 1 from escaping does not decrease as compared with the conventional one in which only the brake b is braked. Of course, the function of preventing the track carrier 1 from escaping when the front wheel 9a and the rear wheel 9b on one side are not floating can be dramatically increased as compared with the conventional one. An embodiment of a self-propelled aerial work vehicle according to the present invention will be described below with reference to FIG. Since the present invention is configured by attaching an auxiliary braking device 16 to be described later to a conventional traveling aerial work vehicle, reference numerals 1 to 3 shown in FIGS.
14 is used in the following description as a synonym. In FIG. 1, reference numeral 16 denotes an auxiliary braking device. The auxiliary brake device 16 is connected to the hydraulic line 15 of the main brake device 10 and generates an auxiliary brake pressure for applying a braking pressure to the fluid actuator 12 of each of the wheel brake mechanisms 11 via the hydraulic line 15 during operation. It comprises a means 17 and an operating means 18 which is arranged at an appropriate position of the self-propelled aerial work vehicle and controls the operation / non-operation of the auxiliary brake pressure generating means 17. In this embodiment, the main brake pressure generating means 14 generates a hydraulic pressure as a braking pressure, and the operating means 18 comprises a snap switch arranged in the driving cab 2 or the like. The auxiliary brake pressure generating means 17 is provided with a hydraulic pressure source 17a such as an accumulator or the like which accumulates hydraulic pressure, and an operation (ON) signal from the operating means 18 interposed between the hydraulic pressure source 17a and the fluid pressure line 15. And an electromagnetic valve 17b that can be switched to the operating position. When the solenoid valve 17b is not receiving an operation signal from the operating means 17a, the solenoid valve 17b communicates with the hydraulic pressure circuit 15 connecting the main brake pressure generating means 14 and each wheel brake mechanism 11, and also communicates with the hydraulic pressure source 17a and the hydraulic pressure circuit. 1
In the state where the connection of the main brake pressure generating means 14 is switched to the operating state by the operation (ON) signal from the operating means 17a, the connection between the main brake pressure generating means 14 and each wheel brake mechanism 11 is cut off. At the same time, the hydraulic pressure of the hydraulic pressure source 17a is applied to each wheel brake mechanism 11 via the hydraulic circuit 15 as a braking pressure. To explain the operation, when performing non-self-propelled aerial work with a self-propelled aerial work vehicle, the operating means 18 is operated to switch the auxiliary brake pressure generating means 17 to the fluid pressure circuit 15.
The brake pressure is applied to each wheel brake mechanism 11 through the control. Then, the front wheels 9a, 9 of the truck carrier 1
a and all of the rear wheels 9b, 9b are braked.
Therefore, even if the wheels on one side of the front wheel and the rear wheel float during non-self-propelled high-place work, the escape of the track carrier 1 can be almost completely prevented, so that non-self-propelled high-place work can be performed more safely. You can. When the truck carrier 1 is allowed to travel by itself, the operation means 18 may be returned to its original state, and the main brake pressure generating means 14 may control the braking of each wheel brake mechanism 11. The self-propelled aerial work vehicle of the present invention, constructed and operated as described above, has an auxiliary braking device 16 during non-self-propelled aerial work.
As a result, all of the front wheels 9a, 9a and the rear wheels 9b, 9b of the truck carrier 1 can be braked, so that even if one of the front wheels and the rear wheel floats, the running of the truck carrier 1 is almost completely prevented. Since it can be prevented, non-self-propelled work at high places can be performed more safely. Further, the auxiliary braking device 16 has an effect that the structure is simple because a part of the main braking device mounted on the truck carrier 1 is used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram for explaining an auxiliary braking device as a main part of a self-propelled aerial work vehicle of the present invention. FIG. 2 is a side view of the self-propelled aerial work platform. FIG. 3 is a circuit diagram for explaining a main braking device of the self-propelled aerial work vehicle. DESCRIPTION OF SYMBOLS 1; truck carrier, 2; driving cab, 3; chassis frame, 4; base frame, 5; swivel base, 6; boom, 7; work table, 8, 8 ...; 8
a, 8a ...; ground wheels, 9a, 9a ...; left and right front wheels, 9
b, 9b ...; left and right rear wheels, 10; main braking device, 11, 1
1 ... wheel brake mechanism, 12, 12 ...; fluid actuator, 13; brake pedal, 14; main brake pressure generating means, 15; fluid pressure circuit, 16;
7; auxiliary brake pressure generating means, 17a; hydraulic pressure source, 17
b; solenoid valve, 18; operating means,

Claims (1)

(57) [Claim 1] A work table is mounted on a base frame mounted on a chassis frame behind a driving cab of a truck carrier via a swivel table and a boom, and a work table is mounted on a lower end portion. Outrigger jacks having grounding wheels are arranged at front, rear, left and right positions of the base frame, and the front wheels of the truck carrier
And ground the ground wheel so that the rear wheel does not float,
Self-propelled high-altitude work while self-propelled on the road
Perform non-self-propelled high-altitude work with the rack carrier stopped.
A self-propelled aerial work vehicle , wherein the truck carrier is controlled by a wheel brake mechanism disposed on each of the left and right front wheels and rear wheels and operated by a fluid actuator, and a brake pedal disposed in a driving cab. A main brake pressure generating means, and a hydraulic brake line for transmitting a braking pressure generated by the main brake pressure generating means to a fluid actuator of each of the wheel brake mechanisms. an auxiliary brake pressure generating means for applying a braking pressure to the fluid actuator connected arranged each wheel brake mechanism through a fluid pressure line to the actuation thereof in fluid pressure line, is in place of the self-propelled aerial platforms auxiliary
Operate and control the brake pressure generating means during non-self-propelled high-altitude work.
A self-propelled aerial work vehicle , comprising: an auxiliary braking device including an operating means for performing non-operation control when working in an aerial work with self-propelled vehicles.