JPH0238991Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a boom-equipped concrete pump truck in which piping for transporting fresh concrete is attached to a vertically bendable boom.

``Prior art'' In general, this type of boom-equipped concrete pump truck pumps into the formwork at the pouring site by raising the boom upward and positioning the hose at the tip of the formwork at the concrete pouring point. Since ready-mixed concrete can be supplied, the work of connecting pipes on site can be omitted, and there are advantages such as high functionality.

By the way, in the above-mentioned concrete pouring work, work such as moving and storing the boom of the concrete pump truck is usually performed by the driver or an auxiliary worker, but it is not necessary to move the concrete pump truck within the site. In order to improve work efficiency and safety, it is preferable for the driver to move the vehicle and the auxiliary workers to operate the boom.

``Problem that the invention seeks to solve'' However, if the driver is responsible for driving the vehicle and the auxiliary worker is responsible for operating the boom, the driver may be required to do so due to safety concerns, especially when moving the vehicle. It is necessary to know the retracted state of the boom, but because it is difficult for the operator to check the position of the boom from the driver's seat, conventionally this check has been done by the driver leaving the driver's seat and retracting the boom. This was done by checking the condition or following instructions from auxiliary workers, which resulted in problems such as poor work efficiency on site.

In addition, when using such a concrete pump truck with a boom, special care must be taken to prevent the boom from lifting not only at the work site but also on public roads. In addition to the precautions taken when driving the vehicle, extreme caution is required when storing the boom.

This invention was made in view of the above circumstances,
The purpose of the present invention is to provide a concrete pump truck with improved safety by allowing the driver to check whether the boom is retracted or the door is ajar while sitting in the driver's seat.

``Means for solving the problem'' This invention has a driver's seat at the front of the vehicle body, a concrete pump mounted at the rear of the vehicle body, and a boom equipped with piping connected to the concrete pump that bends up and down. In a concrete pump truck, the concrete pump truck is freely installed, and is further provided with a pedestal at the rear of the vehicle body on which the boom is placed when it is stored.
A switch means is provided for detecting that the boom is placed on the mount, a switch means is provided for the door of the driver's seat for detecting that the door is closed, and a switch means is provided for the driver's seat for detecting that the boom is placed on the mount. A sensing means is provided for allowing the driver to sense the retracted state of the boom and the closed state of the door based on the output from the provided switch means.

``Function'' In the above configuration, when the boom is separated from the mount or when the door of the driver's seat is open, the sensing means is activated by the output from each switch means to alert the driver in the driver's seat. It informs the status of the boom and door respectively.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

Reference numeral 1 in the figure is the body of a concrete pump truck, and a driver's seat 2 is provided at the front of this body 1.
A concrete pump 3 and its operation panel 4 are mounted at the rear, and between the driver's seat 2 and the concrete pump 3 there are first, second and second pipes equipped with piping 5 connected to the concrete pump 3. Third booms 6a, 6b, and 6c are arranged to be vertically bendable and horizontally pivotable.
These first, second and third booms 6a, 6b, 6c
In this embodiment, it can be folded into three stages in a Z-shape, each of which can be bent, extended and retracted by a hydraulic cylinder 7.

On the other hand, each boom 6 is mounted on the rear of the vehicle body 1.
When the booms 6a, 6b, and 6c are stored, a pedestal 8 is erected on which they are placed.
As a switch means for detecting storage of b and 6c, b
A limit switch 9 having a contact function is provided. This limit switch 9 is used when the third boom 6a, 6a, 6c is mounted.
The contact 9a is pushed by the boom 6c, and the contact is switched.

In addition, on the left and right doors 10 of the driver's seat 2,
As a means for detecting the closed state of the door 10, a limit switch 11 having a b-contact function similar to the above-mentioned frame 8 is provided, and a boom is set in the driver's seat 2 by the output from the two limit switches 9 and 11. 6 retracted state and door 1
A sensing means (indicator light 12) is provided to allow the driver to sense the zero closed state.

The electric circuits of the limit switches 9, 11 and indicator light 12 will be explained with reference to FIG. 6. One end of the limit switches 9, 11 is connected to a positive voltage of +24V, and the other end is connected to the driver's seat 2
It is grounded via an indicator light 12 provided inside.

Next, the operation of this embodiment configured as above will be explained.

As shown in FIG. 4, each boom 6a, 6b, 6
When C is up (Fig. 5), the contact 9a of the limit switch 9 provided on the stand 8 is up, the B contact is closed, current flows through the circuit, and the indicator light 12 lights up. are doing.

When each of the booms 6a, 6b, and 6c is placed on the frame 8, the contact 9a of the limit switch 9 is pushed and the b contact opens. In this case, if the door 10 is open, the b contact of the limit switch 11 is closed. state, current flows through the circuit,
The indicator light 12 is lit. When both doors 10 are completely closed, the limit switch 11
The contacts open and the conduction state is broken, the indicator light 12 goes out, and it is confirmed that the vehicle is in a safe state for running. In this way, the driver can not only know that the booms 6a, 6b, 6c are placed on the frame 8 in the driver's seat 2, but also check the closed state of the door 10, so that safe driving can be quickly ensured. Moreover, it can be recognized reliably, improving workability and safety at the site, and further improving the safety of driving on general roads.

"Effects of the Invention" As explained above, the present invention provides a switch means for detecting that the boom is placed on the boom frame and the door of the driver's seat, and a switch means for detecting that the door is closed, respectively. Since the driver's seat is equipped with sensing means that allows the driver to detect the retracted state of the boom and the closed state of the door based on the output from these switch means, the driver can easily retract the boom from the driver's seat using the sensing means. Moreover, since it can be quickly confirmed and the state of a door partially opened can be known, it has excellent effects such as improving safety when the vehicle is running. Moreover, since the structure is simple and easy to implement, there is an advantage that the applicability to concrete pump trucks of conventional structure can be improved.

[Brief explanation of the drawing]

Figures 1 to 6 show one embodiment of the present invention, in which Figure 1 is a side view of a concrete pump truck, Figure 2 is a rear view thereof, and Figure 3 is a front view of a limit switch installed on a pedestal. 4 is a side view thereof, FIG. 5 is a side view of the concrete pump truck shown for explaining the operation, and FIG. 6 is a circuit diagram. 1... Vehicle body, 2... Driver's seat, 3... Concrete pump, 5... Piping, 6a, 6b, 6c... Boom, 8... Frame, 9, 11... Switch means (limit switch), 10... Door, 12...
Indicator light.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A driver's seat is provided at the front of the vehicle body, a concrete pump is mounted at the rear of the vehicle body, and a boom equipped with piping connected to the concrete pump is installed so that it can be bent up and down. a concrete pump vehicle, further comprising a pedestal on the rear of the vehicle body on which the boom is placed when it is stored; the pedestal is provided with a switch means for detecting that the boom is placed; The door of the driver's seat is provided with a switch means for detecting that the door is closed, and the driver's seat is further provided with a retracted state of the boom based on the output from the switch means provided on the frame and the door. and a concrete pump truck, characterized in that it is provided with a sensing means that allows the driver to sense the closed state of the door. (2) The concrete pump vehicle according to claim 1, wherein the switch means is constituted by a limit switch having a b-contact function.