JPH0443398Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a loading platform for a transport vehicle that transports relatively lightweight loads, a loading platform with a manual tilting (dump) mechanism therein, and a tilting operation device for the loading platform. This is related to the improvement of

(Prior art) In the related type of loading platform, the locking operation for maintaining the loading platform in the inclined discharge position is automatically activated as soon as the transition to that position is completed, but when the loading platform is held in the horizontal position, In order to release the lock when moving to the top, you must hold the tilting lever provided at the rear to prevent the platform from dropping suddenly, and at the same time perform the operation to release the lock. It was impossible.

(Problem to be solved by the invention) In the case of the prior art, when the attitude of the loading platform is shifted from the inclined discharge attitude to the horizontal attitude, it is difficult to simultaneously perform both the release operation of the lock operation and the holding of the tilting lifting rod. Since this was necessary, there was a risk that it would lead to an accident.

(Means for solving the problem) A loading platform with a tilting lifting rod formed at the rear of the machine is supported so that it can rotate about its front side as a fulcrum, and the loading platform has a mounting shaft on the rear side of the fulcrum. An actuating body having a slider formed at the front end of the arm is rotatably fitted on the mounting shaft, and an actuator is mounted on the machine base to restrict the vertical movement of the slider when the loading platform is tilted. Upper and lower guide rails are arranged substantially horizontally, a spring hook member is rotatably fitted to the mounting shaft, and a tension spring is stretched between the spring hook member and the front end of the actuating body. A downward step is formed at the operating position of the slider at the loading platform tilting completion position of the lower guide rail, and the spring hanging member has a switching lever for switching and adjusting the angle of the spring hanging position. , and then, by operating the switching lever, the slider is moved up and down.
The tension spring is configured so that the tension angle of the tension spring relative to the arm is changed so as to come into elastic contact with one side of the lower guide rail.

(Function) When transport is completed and the loaded object is unloaded, the switching lever is operated so that the tensioning angle of the tension spring is held in elastic contact with the lower guide rail. Then, lift the tilting lever at the rear of the loading platform and let the loaded object slide down. The operating body rotates as the loading platform tilts, and the slider slides toward the step side while making elastic contact with the lower guide rail. When the loading platform is tilted until the loaded object on the loading platform slides down, the slider is forced to fall onto the step due to the elasticity of the tension spring. When the tilting support rod is released in this state, the loading platform attempts to shift to a horizontal position due to its own weight, but the slider hits the step and the loading platform cannot shift to the horizontal orientation any further. To shift the loading platform to the horizontal position, the switching lever is operated to return to its original state. This operation changes the tensioning angle of the tension spring with respect to the arm, but the angle of the operating body does not change because the slider is still depressed into the step, so the attitude of the loading platform does not change. Therefore, when the tilting lever is slightly lifted and the loading platform is further tilted, the slider disengages from the step. Then, due to the elasticity of the tension spring, the slider floats between the upper and lower guide rails, allowing sliding. Then, the loading platform is shifted to a horizontal position almost by its own weight. During this transition, the slider slides toward its original position while elastically coming into contact with the upper guide rail due to the elasticity of the tension spring.

(Example) A is a transport vehicle that can implement the present invention. Reference numeral 1 denotes a machine base of the transport vehicle A, and a loading platform 2 is mounted on the machine base 1. The loading platform 2 is equipped with a manual tilting mechanism. First, the tilting lifting rod 3 is formed at the rear of the loading platform 2. Then, in order to rotate the front side of the loading platform 2 to the fulcrum 4, the machine platform 1
to support it. A mounting shaft 5 is installed laterally on the loading platform 2 on the rear side of the fulcrum 4 thereof. An actuating body 6 is rotatably fitted onto the mounting shaft 5. The actuating body 6 is an arm 6
A slider 6b is formed at the tip of a. The slider 6b is a rolling roller that is rotatably supported on the arm 6a. On the other hand, upper and lower guide rails 7a and 7b are arranged substantially horizontally in parallel to the machine base 1. The slider 6 is attached to the guide rails 7a and 7b.
b engages, and when the loading platform 2 is tilted to restrict the vertical movement of the slider 6b, the slider 6b moves against the guide rails 7a, 7.
b. In addition, the mounting shaft 5
A spring hook member 8 is rotatably fitted to the spring hook member 8. A tension spring 9 is stretched between the spring hanging member 8 and the slider 6b portion on the front side of the actuating body 6. Among the upper and lower guide rails 7a and 7b, a downward step 7b1 is formed in the lower guide rail 7b. The arrangement position of the step 7b1 is the operating position of the slider 6b at the tilting completion position of the loading platform 2. A switching lever 10 for switching and adjusting the angle of the spring hanging position is connected to the spring hanging member 8.

Note that 11 is a guide plate in which a guide groove 11a for regulating the operation movement of the switching lever 10 is formed;
A1 is a stopper groove that maintains the engagement angle between the switching lever 10 and the spring hanging member 8, and 15 is a tension spring that elastically biases the switching lever 10 toward the stopper groove 11a1. Therefore, the switching lever 1
0, the tension angle of the tension spring 9 relative to the arm 6a is changed. By the switching operation, the elastic force of the tension spring 9 switches the slider 6b to either the upper guide rail 7a or the lower guide rail 7b so that it comes into elastic contact with the slider 6b. In the embodiment, 12 is a locking device for preventing the loading platform 2 from jumping up when the transport vehicle A is moved, 13 is an engine, and 14 is a traveling crawler.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

(Effects) According to the present invention, the switching lever 10 is moved from the slider 6 when the loading platform 2 is moved from the inclined discharge position to the horizontal position.
If the slider 6b is only operated in the direction in which it comes into elastic contact with the upper guide rail 7a, the slider 6b will still be in contact with the step 7b1, and the loading platform 2 will not change its posture immediately due to its own weight. By slightly lifting the upper rod 3, the above state is changed to the tension spring 9.
Since the tension is automatically released by the tension of the lever and the posture change is allowed for the first time, there is no need for the operator to operate both the switching lever 10 and the tilting upper lever 3 at the same time, and they are completely separated. You can completely change your posture.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a transport vehicle that can implement the present invention.
FIG. 2 is a side view of the main parts of the same as above, and FIG. 3 is a side view of the same as the above when the loading platform is in an inclined discharge position. Explanation of main symbols in the drawings: 1... Machine base, 2... Loading platform, 3... Tilting lifting rod, 4... Fulcrum, 5... Mounting shaft, 6... Operating body, 6a... Arm, 6b ... Slider, 7a ... Upper guide rail, 7b ... Lower guide rail, 7b1 ... Step, 8 ... Spring hanging member, 9 ... Tension spring, 10 ... Switching lever.

Claims (1)

[Scope of utility model registration request] A loading platform with a tilting lifting rod formed at the rear is supported on the machine base so that it can rotate about the front side of the loading platform, and a mounting shaft is attached to the loading platform on the rear side of the supporting point, and an arm is attached to the mounting shaft. An actuating body for forming a slider is rotatably fitted on the front side of the machine, and upper and lower guide rails are installed approximately horizontally on the machine platform to restrict the vertical movement of the slider when the platform is tilted. A spring hook member is rotatably fitted to the mounting shaft, and a tension spring is stretched between the spring hook member and the front end of the actuating body, and a loading platform of the lower guide rail is installed in parallel. A downward step is formed at the operating position of the slider at the tilting completion position, and a switching lever is connected to switch and adjust the angle of the spring hanging position of the spring hanging member. A loading platform with a manual tilting mechanism, characterized in that the tensioning angle of the tension spring with respect to the arm is switched so that the slider comes into elastic contact with one side of the upper and lower guide rails by operation. tilting operation device.