JPS6218407Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a concrete mixer truck that mixes and transports ready-mixed concrete using an inclined drum provided on the chassis, and discharges the concrete by rotating the drum in the opposite direction at a required site.

As is clear from FIGS. 1 and 2, at the rear of the concrete mixer vehicle, there is a chute 2 that receives the fresh concrete discharged from the drum 1 and supplies it to the required formwork or the hopper of the concrete pump vehicle. It is being This shot 2
In this case, a vertical shaft 4 connected to a support leg 3 provided near the base end is inserted into the tip hole 7 of an arm rod 6 provided rearwardly in a mounting frame 5 of a roller that supports the rear part of the drum 1. It is supported so that it can rotate, and when not in use, it is placed horizontally and fixed along the rear surface of the vehicle body as shown in Figures 1 and 2. When discharging fresh concrete, it is connected to an auxiliary chute 2' and is connected to a hydraulic After operating the cylinder 8 and keeping the entire chute 2 raised nearly horizontally as shown by the chain line in Fig. 2, it is turned rearward about the vertical shaft 4 and lowered again to raise the tip of the chute 2 to the required position. The chute 2 is fixed in an immovable state by preventing rotation of the vertical shaft 4 with respect to the arm rod 6 by a locking metal fitting 9 provided on the vertical shaft 4 facing the formwork or the like.

By the way, as is clear from FIG. 3, the conventionally used locking fitting has a locking piece 11 that can be turned up and down on the brim surface of the expanded head 10 fixed to the vertical shaft 4. The vertical shaft 4 is fixed by selectively falling into one of several notches 12 provided in advance in the overhanging edge of the tip hole 7 of the arm rod 6.
Because the number of ... is limited due to the structure, the fixing position of the chute 2 is also determined in the direction according to the notch 12, which causes the inconvenience of having to set it in a position that is different from the actually required direction. Ta.

This invention eliminates this drawback and allows shoot 2
An embodiment of this invention will be described with reference to the drawings. As shown in FIGS. 4 and 5, the vertical axis 4 is inserted through the arm rod 6 with its enlarged head 10 supported on the mouth edge of the tip hole 7, as in the conventional case, but in this invention, a window-like hole is provided in the portion corresponding to the tip of the arm rod 6. A cutout 13 is formed, and the circumferential surface of the vertical shaft 4 exposed within the cutout 13 is clamped with a presser foot 14 to prevent rotation of the vertical shaft 4. That is, this presser foot 14 has one end hinged to the arm rod 6 by a shaft 15, and the other end is tightened and pulled to a receiver 16 fixed to the arm rod 6 via a tightening screw 17. As a result, the rubber-applied surface, which is the inner surface 18, comes into pressure contact with the circumferential surface of the vertical shaft 4, and the vertical shaft 4 is clamped and fixed between the inner surface 18 and the inner surface of the tip hole 7. In addition,
The tightening screw 17 includes a bolt 19 that is removably fixed to the presser foot 14 through a square hole so that it can be conveniently replaced because the threads of the tightening screw 17 are often worn during use.
Female thread handle 2 with a rod connected to a simple nut
It is formed from 0.

This device has the above-mentioned structure, but unlike the conventional device, it does not have the notch 12, etc., so the chute 2 can be fixed in its predetermined state, making it extremely convenient and easy to operate. At the same time, there are many advantages, such as no rattling like the notch 12, so no noise is generated in this part due to drum vibration.

[Brief explanation of drawings]

Figures 1 and 2 are a side view and rear view showing the general structure of a concrete mixer truck, Figure 3 is a slope view of a conventional chute fixing device, Figure 4 is a rear view of this invention, and Figure 5 is a rear view of the concrete mixer truck. FIG. 4 is a cross-sectional plan view taken along the line A-A in FIG. 4; Explanation of symbols, 2...Chute, 14...Presser foot, 4...Vertical shaft, 17...Tightening screw, 6...Arm rod, 20...Female thread handle, 7...Tip hole, 1
0...Bullet head, 13...Cutout part.

Claims (1)

[Scope of utility model registration request] In a chute for discharging fresh concrete, the vertical axis of which is inserted into and supported by the tip of an arm rod protruding toward the rear of the vehicle body so that it can pivot left and right, a cutout 13 is provided at the tip of the arm rod 6, and The presser foot 14, which is located inside the cutout 13 and whose inner surface is pressed against the circumferential surface of the vertical shaft 4 inside the cutout, can be opened and closed by hinged one end to the arm rod 6 and connected the other end to the tightening screw 17. A chute fixing device for a concrete mixer truck installed in