JPH0431572Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load detection device for a spacer pole that supports electric wires while they are being installed during overhead line work or the like.

When performing overhead line work with the electric wires still installed, use a spacer pole attached to the boom end of a crane truck or the work platform of an aerial work vehicle to move the electric wires to a safe position and support them. However, conventional spacer poles do not have a device to detect overload or lateral shaking of the wires caused by supporting the wires. There was a risk of damage.

The present invention was developed in view of the above circumstances, and uses a spring provided between the outer bracket and the inner bracket and a spring provided between the inner bracket and the spacer pole to move the spacer pole in the vertical direction and along the axis of the spacer pole. Detects when the spacer pole, which is elastically supported in the left and right directions around its axis, slides or swings a predetermined distance in the up and down direction along the spacer pole axis and in the left and right directions around the axis. It is an object of the present invention to provide a spacer pole load detection device that can prevent damage to the spacer pole due to overload or lateral sway of electric wires supported by the spacer pole by sensing each of the spacer poles with a spacer pole.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of the boom of a crane truck with spacer poles attached. A support frame 2 is attached to the tip of the boom 1 of the crane truck, a bracket 4 is fixed to this support frame 2, and An outer bracket 6 is pivotally supported at one end so as to be swingable about a horizontal axis by a pin 8, and a telescoping cylinder 5 whose both ends are pivotally supported is provided at the other end of the bracket 4 and the outer bracket 6. As a result, the outer bracket 6 swings in the left-right direction around the pin 8.

FIG. 2 shows details of the main parts of the present invention, in which the inner bracket 7 is fitted into the outer bracket 6 so as to be slidable in the vertical direction, and the inner bracket 7 is fitted into the outer bracket 6 so that the inner bracket 7 is inserted upwardly. A spacer pole 3 is fitted into the inner bracket 7 so as to be able to swing from side to side, and is pivoted to the inner bracket 7 by a pin 9. The spacer pole 3 is supported in a vertical position by a spring 11 provided so as to be opposed to each other.
A pin 9 is provided on the side surface of the outer bracket 6 for pivotally supporting the spacer pole 3 to the inner bracket 7.
A hole 14 is provided for attachment and detachment.

A limit switch 12 is attached to the bottom of the inner surface of the outer bracket 6, and this limit switch 12 is activated by sliding the inner bracket 7 downward over a predetermined distance. Limit switches 1 are attached to the upper end of the inner bracket 7 on the left and right sides of the spacer pole 3 via brackets 15 and 15'.
3 and 13' are mounted to face each other, and these limit switches 13 and 13' are activated by swinging the spacer pole 3 to the left or right by a predetermined distance or more. Said limit switch 12,1
3 and 13' are each connected to an alarm device (not shown).

With the above configuration, when carrying out overhead line work using the spacer pole 3, the spacer pole 3 is adjusted by the telescopic cylinder 5 so that it is perpendicular to the overhead line, and the overhead line is moved by the spacer pole 3 by extending and contracting and undulating the boom 1. The spacer pole 3 is moved to a safe position and supported, but if the load from the overhead wire supported by the spacer pole 3 exceeds a predetermined load, the spacer pole 3 is pushed downward along the axis of the spacer pole 3, and as a result, As a result, the inner bracket 7 moves against the force of the spring 11 and the outer bracket 6
the limit switch 12 and the alarm device. Furthermore, when the overhead wire supported by the spacer pole 3 is pulled in the lateral direction with a tension greater than a predetermined value, the spacer pole 3 sways more than a predetermined distance to the left or right about the pin 9 against the bias of the spring 11. the limit switch 13 or limit switch 13' to activate the alarm device. Note that the load acting on the spacer pole can also be detected using a load cell or the like.

As described above, the present invention provides a spacer pole load detection device that can prevent the overhead wire of the spacer pole from being damaged due to overload or rolling due to a simple structure. This has a great effect on improving the safety of construction work.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a side view of the boom of a crane truck with a spacer pole attached;
FIG. 2 is a side view of the spacer pole load detection device. 3... Spacer pole, 6... Outer bracket, 7... Inner bracket, 10, 11... Spring, 12, 13, 13'... Limit switch.

Claims (1)

[Scope of utility model registration request] An inner bracket is fitted into the outer bracket so as to be slidable in the vertical direction, a spacer pole is pivoted to the inner bracket by a pin so as to be able to swing from side to side, and a spring provided between the outer bracket and the inner bracket allows the spacer pole to be attached to the inner bracket. Elastically supports the pole in the vertical direction along the axis of the spacer pole,
The spring provided between the inner bracket and the spacer pole elastically supports the spacer pole in the left and right direction with the axis of the spacer pole as the center, and the spacer pole supports the spacer pole in the vertical direction or around the axis of the spacer pole. A load detection device for a spacer pole, characterized in that it is equipped with a sensor that detects sliding or swinging of a spacer pole by a predetermined distance in the left and right directions.