Tilt opening / closing auxiliary tool set and tilt opening / closing method using the same

Abstract

To provide a gate opening / closing auxiliary tool set and a gate opening / closing method using the same, which enables not only workers with normal muscle strength but also workers with little basic muscle strength, such as elderly people and women, to open and close the gate of a dump truck efficiently and without stress. [Solution] A gate opening / closing auxiliary tool set comprising a gate holder having a grip-like fixed handle portion for holding the edge of the gate of a truck, and an arm-like movable handle that can be detachably connected to the gate holder, wherein the gate holder has a holder main body portion that is roughly U-shaped in side view and can grip the edge of the gate, and a fixed handle portion fixed to the back side of the holder main body, and the movable handle has an engagement mouth portion that can engage with an engagement portion provided on the back side of the holder main body and facing in a direction approximately perpendicular to the side of the holder main body, and an arm portion that has this engagement mouth portion at its tip, and when the engagement mouth portion is engaged with the engagement portion of the holder main body, it can rotate in only one direction around the engagement point.

Description

[Technical Field]

[0001] The present invention relates to a gate opening / closing auxiliary tool set used when opening and closing a gate, which is a bed door of a truck, and a gate opening / closing method using the same, and more particularly to a tool used for opening and closing the gate of a dump truck. [Background technology]

[0002] Generally, the bed of a truck is provided with a door known as a "gate," which can be opened and closed to load or unload cargo onto or from the bed. However, opening and closing the gates each time a load is to be loaded or unloaded is physically demanding work and places a heavy burden on the driver and other personnel. Therefore, in order to facilitate the opening and closing of the tilt, a device for opening and closing the tilt called a tilt balancer has been devised (see, for example, Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Takara Industries Co., Ltd.'s "Aori Balancer Catalog," [online] [Retrieved August 4, 2025], Internet <URL:chrome-extension: / / efaidnbmnnnibpcajpcglclefindmkaj / https: / / takara-co.com / admin / wp-content / themes / takara / media / 20180718-104652-735.pdf> Summary of the Invention [Problem to be solved by the invention]

[0004] However, the gate opening / closing device as described above is a device that uses a spring mechanism to assist in opening and closing the gate of a standard truck, and is designed to assist in opening and closing a lightweight gate.

[0005] However, dump trucks are vehicles designed to withstand harsh environments such as construction, civil engineering, and forestry, and are constructed to be sturdy enough to carry a variety of soil, sand, waste, materials, and other materials. Even the tailgates, which are used to open and close the loading and unloading of trucks, are made of heavy, solid iron weighing 50kg to 60kg.

[0006] For this reason, when opening the gate, even if the gate is lifted using the hinge as a fulcrum, a force of 25 to 30 kg is required, and when closing it, the heavy gate must be lifted up to chest height or above, depending on the worker's height. Therefore, it is difficult to use the above-mentioned conventional gate opening / closing device, which is intended to assist in opening and closing a light gate, on the heavy and bulky gate of a dump truck to perform the gate opening and closing operation.

[0007] Therefore, opening and closing the dump truck's gate requires the worker to manually lift the heavy gate, which is a burden even for workers with normal muscle strength, and it is even more difficult for workers with less basic muscle strength, such as elderly people and women, to open and close the gate efficiently and without stress.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a gate opening / closing auxiliary tool set and a gate opening / closing method using the same that allow not only workers with normal muscle strength, but also workers with less basic muscle strength, such as the elderly and women, to open and close the gate of a dump truck stress-free and efficiently. [Means for solving the problem]

[0009] In order to solve the above problems, the first invention is a gate opening / closing auxiliary device set comprising a gate holder having a grip-shaped fixed handle portion for holding the edge of the gate of a truck, and an arm-shaped movable handle that can be detachably connected to the gate holder, wherein the gate holder has a holder main body portion that is approximately U-shaped in side view and can grip the edge of the gate, and a fixed handle portion fixed to the back side of the holder main body, and the movable handle has an engagement mouth portion that is provided on the back side of the holder main body and can engage with an engagement portion that faces in a direction approximately perpendicular to the side of the holder main body, and an arm portion that has this engagement mouth portion at its tip, and when the engagement mouth portion is engaged with the engagement portion of the holder main body, it can rotate in only one direction around the engagement point.

[0010] The second invention is characterized in that the tilt opening / closing auxiliary device set of the first invention is equipped with a rod-shaped stand whose tip is attached to the bottom surface of the holder main body of the tilt holder and can be set to expand and contract only in the extension direction.

[0011] The third invention is characterized in that, in the tilt opening / closing auxiliary device set according to the second invention, the stand has a tip that can be detachably attached to the bottom surface of the holder main body of the tilt holder.

[0012] The fourth invention is characterized in that, in the tilt opening / closing auxiliary device set relating to the first invention, it is provided with a thickness adjustment plate material that is inserted into the holder main body portion to make the internal thickness of the holder main body portion approximately equal to the thickness of the tilt.

[0013] The fifth invention is a method for closing the gate of a truck using the gate opening / closing auxiliary tool set of the first invention, characterized in that it comprises: a gate holding process in which the edge of the gate is gripped by the holder main body of the gate holder; a gate lifting process in which, after the gate holding process is completed, the holder main body holding the gate is lifted to a desired height using the fixed handle part of the gate holder and the arm part of the movable handle with its engagement mouth part engaged with the engagement part of the holder main body; and a holding position adjustment process in which, after the gate lifting process is completed, the movable handle is rotated so that the holding position of the arm part is lower by the desired height than the current holding position.

[0014] A sixth aspect of the present invention is a method for opening and closing a gate according to the fifth aspect of the present invention, wherein before or after the gate holding step is performed, stand The method is characterized by comprising: a stand mounting step in which the tip of the stand is mounted on the bottom surface of the holder body of the tilt holder in a state in which the stand is set to expand and contract only in the extension direction; and a tilt position maintaining step in which, after the stand mounting step is completed, the stand is raised and the stand is extended in the height direction while performing a tilt lifting step, thereby maintaining the holder body holding the edge of the tilt in a lifted position by the stand. [Effects of the Invention]

[0015] According to the present invention, there is an excellent effect that not only workers with normal muscle strength but also workers with less basic muscle strength, such as elderly people and women, can open and close the dump truck's tailgate stress-free and efficiently. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing a tilt opening / closing assisting tool set according to a first embodiment of the present invention. [Figure 2] FIG. [Figure 3]1A and 1B are diagrams showing each surface of the tilt retainer, where (a) is a side view of the tilt retainer, (b) is a plan view of the tilt retainer, (c) is a front view of the tilt retainer, and (d) is a rear view of the tilt retainer. [Figure 4] FIG. 10 is a perspective view showing a state in which the movable handle is connected to the tilt holder. [Figure 5] FIG. 10 is a side view showing the direction in which the movable handle can be moved. [Figure 6] FIG. 3 is a schematic cross-sectional view showing a latch mechanism applied to the first embodiment. [Figure 7] 10A and 10B are schematic cross-sectional views showing the function of the latch mechanism applied to the first embodiment, in which (a) shows the meshed state of the gear and the claw portion, (b) shows the state just before the gear and the claw portion are disengaged, (c) shows the disengaged state of the gear and the claw portion, and (d) shows the re-engaged state of the gear and the claw portion. [Figure 8] 1 is a schematic side view of a dump truck using a gate opening / closing auxiliary tool set according to a first embodiment. [Figure 9] FIG. [Figure 10] FIG. 10 is a side view showing the first lifting method of the tilt. [Figure 11] 10A and 10B are side views showing a method for adjusting the grip position of the movable handle. [Figure 12] FIG. 10 is a side view showing the second lifting method of the tilt. [Figure 13] FIG. 10 is a side view showing a method for adjusting the grip position of the second movable handle. [Figure 14] FIG. 10 is a side view showing a method for completing the closing operation of the gate. [Figure 15] FIG. 2 is a perspective view showing a thickness adjusting plate member. [Figure 16] This is a side view to explain how to use the thickness adjustment plate material, where (a) shows the state in which the thickness adjustment plate material is attached inside the holder main body, and (b) shows the state in which the tilt is clamped through the thickness adjustment plate material. [Figure 17] FIG. 10 is a perspective view showing a tilt opening / closing assisting tool set according to a second embodiment of the present invention. [Figure 18] FIG. 2 is a schematic partial cross-sectional view of a stand 7. [Figure 19] 10A and 10B are enlarged partial cross-sectional views showing the function of the latch mechanism applied to the second embodiment, where (a) shows the disengaged state of the straight gear portion and the claw portion, and (b) shows the engaged state of the straight gear portion and the claw portion. [Figure 20] 10A and 10B are side views showing a method for erecting the stand connected to the tilt holder. [Figure 21] FIG. 10 is a side view showing the first lifting method of the tilt. [Figure 22] FIG. 10 is a side view showing a method for adjusting the grip position of the movable handle for the first time. [Figure 23] FIG. 10 is a side view showing the second lifting method of the tilt. [Figure 24] FIG. 10 is a side view showing a method for adjusting the grip position of the second movable handle. [Figure 25] FIG. 10 is a side view showing the third lifting method of the tilt. [Figure 26] FIG. 10 is a side view showing a third method for adjusting the grip position of the movable handle. [Figure 27] FIG. 10 is a side view showing a method for completing the closing operation of the gate. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention is a gate opening / closing auxiliary tool set that can be applied to opening and closing the gates of many trucks, and is not limited to the gates of dump trucks. An embodiment in which the present invention is applied to opening and closing the gates of a dump truck will be described below with reference to the drawings.

[0018] Example 1 FIG. 1 is a perspective view showing a tilt opening / closing assisting tool set according to a first embodiment of the present invention. As shown in FIG. 1, the tilt opening / closing assisting tool set of this embodiment includes a tilt holder 1 and a movable handle 2.

[0019] Fig. 2 is a perspective view of the tilt retainer 1. Fig. 3 is a diagram showing each surface of the tilt retainer 1, where (a) is a side view of the tilt retainer 1, (b) is a plan view of the tilt retainer 1, (c) is a front view of the tilt retainer 1, and (d) is a rear view of the tilt retainer 1. The gate holder 1 is a device for holding the edge of the gate of a dump truck, and as shown in Figures 2 and 3, it has a holder main body 3 that is roughly U-shaped when viewed from the side, and grip-shaped fixed handle portions 4A, 4B.

[0020] The cage body 3 is a part for gripping the edge of the gate and is made of a hard material. Although any type of material can be used, in this embodiment, the cage body 3 is made of iron.

[0021] The fixed handle portions 4A and 4B are portions that are gripped by an operator. The fixed handle portion 4A is The retainer body 3 is formed of iron, and the fixed handle portion 4A is formed of iron, and the fixed handle portion 4B is formed of iron.

[0022] 3(a), the fixed handle portion 4A is disposed on the rear surface 33 side of the retainer body portion 3, with its upper end portion 41 welded to the upper surface 31 of the retainer body portion 3 and its lower end portion 42 welded to the lower surface 32 of the retainer body portion 3. The inclination of this fixed handle portion 4A with respect to the rear surface 33 is arbitrary, but in this embodiment, the plane including the fixed handle portion 4A and the rear surface 33 are set to intersect at a right angle. On the other hand, the fixed handle portion 4B is fixed to the rear surface 33 side as shown in FIG. 3(b). Specifically, a nut-shaped engaging portion 34 is fixedly provided on the rear surface 33 side of the holder body 3, parallel and horizontal to the rear surface 33, and the tip portion 43 of the fixed handle portion 4B is screwed into this engaging portion 34. Therefore, the gripping length of the fixed handle portion 4B can be adjusted by changing the screw-in depth of the tip portion 43.

[0023] In FIG. 1, the movable handle 2 is an arm-like device that can be detachably connected to the tilt holder 1, and has an engaging opening portion 5 and an arm portion 6.

[0024] FIG. 4 is a perspective view showing a state in which the movable handle 2 is connected to the tilt holder 1, and FIG. 5 is a side view showing the direction in which the movable handle 2 can be moved. 3(b), the engaging portion 34 of the retainer body 3 is fixed to the rear surface 33 side so as to be parallel and horizontal to the rear surface 33. In other words, the engaging portion 34 faces in a direction perpendicular to the side surface 35 of the retainer body 3. As shown in FIG. 4, the engaging opening 5 of the movable handle 2 is a portion that can be engaged with the engaging portion 34, and by engaging with the engaging portion 34, the movable handle 2 can be connected to the tilt holder 1.

[0025] 1, the engaging opening 5 of the movable handle 2 is provided with a hole 50 having twelve grooves 51 that mate with the corners 35 of the hexagonal engaging portion 34. By inserting this hole 50 into the engaging portion 34, the grooves 51 of the hole 50 mate with the corners 35 of the engaging portion 34, and the engaging opening 5 and the engaging portion 34 are brought into an engaged state. The number of grooves 51 in the hole 50 is arbitrary, but in this embodiment, since the number of corners 35 of the engaging portion 34 is six, the number is set to twelve, which is double the number.

[0026] As shown in Figure 5, the movable handle 2 is equipped with a rotation mechanism that can rotate in only one direction (for example, the direction of the arrow) around the engagement point when the engagement port portion 5 is engaged with the engagement portion 34 of the holder main body portion 3. In this embodiment, a latch mechanism is used as such a rotation mechanism, but the present invention is not limited to this, and any rotation mechanism having a structure that allows rotation in only one direction can be used.

[0027] FIG. 6 is a schematic cross-sectional view showing a latch mechanism applied to this embodiment. As shown in FIG. 6, the movable handle 2 has therein a gear 53 and a claw portion 54 that constitute a latch mechanism. The gear 53 is a rotating body having the above-mentioned hole 50 and groove 51, and is mounted inside the engaging mouth portion 5. The gear 53 is held by a bearing or the like (not shown) so that it can rotate independently inside the engaging mouth portion 5. Claw 54 is a rotating body provided inside the tip side of arm 6. Claw 54 is rotatably attached to shaft 55 fixed inside arm 6, with its tip meshing with teeth 53a of gear 53. Claw 54 is biased to the left in the figure by spring 56 interposed between claw 54 and the inner surface of arm 6.

[0028] Figure 7 is a schematic cross-sectional view showing the function of the latch mechanism applied to this embodiment, where (a) shows the meshed state between the gear and the claw portion, (b) shows the state just before the gear and the claw portion are disengaged, (c) shows the disengaged state between the gear and the claw portion, and (d) shows the re-engaged state between the gear and the claw portion. As shown in FIG. 7(a), when the gear 53 is rotated in the direction of arrow A, the claw portion 54, the tip of which is engaged with the tooth 53a, overcomes the biasing force of the spring 56 and starts to rotate in the direction of arrow B. As shown in FIG. 7(b), when the gear 53 is further rotated in the direction of arrow A, the claw portion 54 also further rotates in the direction of arrow B, and moves in a direction in which the tip end and the tooth 53a are disengaged. Then, as shown in (c) of Figure 7, when the gear 53 is further rotated in the direction of arrow A, the engagement between the tip and the tooth 53a is released, and the claw portion 54 rotates in the direction of arrow C due to the biasing force of the spring 56. As a result, as shown in FIG. 7(d), the claw portion 54 returns to its original state, and its tip re-engages with the teeth 53a in the subsequent stage. Thereafter, the operation of rotating the gear 53 in the direction of arrow A can be continued in the same manner.

[0029] 7(a) or 7(d), if gear 53 is attempted to be rotated in the direction opposite to arrow A, pawl 54 will attempt to rotate in the direction opposite to arrow B. In other words, the tip of pawl 54 that is engaged with tooth 53a will attempt to move upward in the figure, and tooth 53a of gear 53 that is engaged with this tip will attempt to move downward in the figure. As a result, the rotation of gear 53 is blocked by pawl 54, and it becomes unable to rotate. Therefore, gear 53 cannot be rotated in the direction opposite to arrow A.

[0030] As described above, gear 53 of movable handle 2 can continue to rotate in the direction of arrow A, but cannot rotate in the opposite direction to arrow A. This means that movable handle 2 can continue to rotate around aperture 50 of gear 53 in the direction opposite to arrow A, but cannot rotate in the direction of arrow A.

[0031] Therefore, the engagement portion 34 of the tilt holder 1 shown in Figure 2 can be inserted into the hole 50 of the engagement opening portion 5 shown in Figure 6 from the back side of the figure, and the movable handle 2 can be engaged with the holder main body portion 3 as shown in Figures 4 and 5.In this case, the movable handle 2 can only be rotated downward around the hole 50, which is the engagement point, as shown by the arrow.

[0032] Next, an example of how to use the tilt opening / closing assisting tool set of the first embodiment will be described. Fig. 8 is a schematic side view of a dump truck using the tilt opening / closing assist tool set of this embodiment. Also, Fig. 9 is a side view showing a method for holding the tilt, Fig. 10 is a side view showing a method for lifting the tilt for the first time, Fig. 11 is a side view showing a method for adjusting the holding position of the movable handle, Fig. 12 is a side view showing a method for lifting the tilt for the second time, Fig. 13 is a side view showing a method for adjusting the holding position of the movable handle for the second time, and Fig. 14 is a side view showing a method for completing the operation of closing the tilt. This example of use also specifically implements the gate opening / closing method according to the fifth aspect of the present invention.

[0033] As shown in Fig. 8, the dump truck 100 is provided with a gate 102 on a loading platform 101. The gate 102 is attached so as to surround the sides and rear of the loading platform 101, and can be opened and closed using hinges 103 at the edge of the loading platform 101 as fulcrums, as shown by the two-dot chain line.

[0034] In such a dump truck 100, when opening the tailgate 102 on the rear of the loading platform 101, an operator holds the upper edge of the tailgate 102 and rotates it so as to tilt it backward.

[0035] On the other hand, as shown by the two-dot chain line in FIG. 8, when the open gate 102 is to be closed, the gate opening / closing auxiliary tool set of this embodiment is used to perform the work. 9, the fixed handle portion 4A of the tilt holder 1 to which the movable handle 2 is connected is grasped with the right hand R, and the arm portion 6 of the movable handle 2 is grasped with the left hand L. Then, the edge of the tilt 102 is gripped by the tilt holder 1 (execution of the tilt holding process).

[0036] Thereafter, the worker assumes a half-squat position and, while holding the fixed handle portion 4A and the movable handle 2 with the right hand R and the left hand L as shown by the arrows in Figure 10, lifts the gate holder 1 holding the gate 102, for example, to about waist height of the worker, in preparation for closing the gate 102 (executing the gate lifting process).

[0037] In the state shown in FIG. 10, both the right hand R and the left hand L are near the waist of the worker, so if the worker tries to raise the right hand R and the left hand L from that position to lift the tilt 102, it is difficult to apply force. Therefore, as shown by the arrow in FIG. 11, the movable handle 2 is rotated downward to lower the holding position of the left hand L to a height at which it is easy to apply force (execution of the holding position adjustment step).

[0038] In this state, the worker stands up and, as shown by the arrow in Figure 12, lifts the gate holder 1 holding the gate 102 from waist level to, for example, chest height of the worker in the standing state, preparing to close the gate 102 in one go (executing the gate lifting process).

[0039] In the state shown in Figure 12, the right hand R and left hand L are near the chest of a standing worker. Stretching the right hand R and left hand L further up from such a high position to lift the gate 102 requires a considerable amount of strength, and the lifting operation is also quite difficult. In other words, in this state, it is difficult to build up momentum and close the gate 102 in one go. Therefore, as shown by the arrow in FIG. 13, the movable handle 2 is rotated downward to lower the holding position of the left hand L to a height where a large force can be easily applied (execution of the holding position adjustment step). As a result, as shown in FIG. 14, the gate 102 can be closed in one go with momentum, and the closing operation of the gate 102 can be completed without any problems.

[0040] Fig. 15 is a perspective view showing a thickness-adjusting plate, and Fig. 16 is a side view for explaining how to use the thickness-adjusting plate, where (a) shows the thickness-adjusting plate attached to the inside of the holder body, and (b) shows the gate clamped via the thickness-adjusting plate.

[0041] 5, the internal thickness of the cage body 3 is set to correspond to the thickness of the gate 102 of a regular dump truck 100. Therefore, if a gate that is thinner than the gate 102 of a regular dump truck 100 is held in the cage body 3, a large gap will be created between the gate 102 and the cage body 3.

[0042] The thickness adjustment plate 37 shown in Fig. 15 is a plate that can be used in such cases. The thickness adjustment plate 37 is made of a hard material, and a magnet 38 is attached to its surface. The overall shape of the thickness adjustment plate 37 corresponds to the internal shape of the holder main body 3, and is rectangular in plan view.

[0043] When handling a gate thinner than the gate 102 of a commonly used dump truck 100, a thickness adjusting plate 37 having a thickness obtained by subtracting the thickness of the non-commonly used gate 102' from the internal thickness of the cage body 3 is selected, as shown in Fig. 16(a). Then, this thickness adjusting plate 37 is inserted into the cage body 3 and magnetically attached to the lower side of the upper surface 31 (or the upper side of the lower surface 32). This makes the internal thickness of the cage body 3 approximately equal to the thickness of the gate 102'. As a result, as shown in Figure 16(b), the thin gate 102' can be held in the gate cage 1 without any gaps. Therefore, if the worker often handles trucks different from the dump truck 100 that he normally uses, it is preferable to provide a plurality of thickness adjustment plates 37 with different thicknesses.

[0044] In the above example of use, the fixed handle portion 4A of the tilt holder 1 is gripped with the right hand R, but it goes without saying that the fixed handle portion 4B may also be gripped with the right hand R. Depending on the situation, it is determined whether to grip the fixed handle portion 4A or the fixed handle portion 4B. In addition, in the above example of use, the movable handle 2 is operated with the left hand L, but depending on which hand you are dominant with, you may want to operate it with the right hand R. In such a case, with the tilt holder 1 in the state shown in Figures 4 and 5 turned upside down, the engaging opening 5 of the movable handle 2 is engaged with the engaging part 34 displaced to the left side of the figure. At this time, the engaging part 34 is inserted into the opening 50 of the engaging opening 5 shown in Figure 6 from the front side of the figure.

[0045] As explained in detail above, in the tilt opening / closing assist device set of this embodiment, the tilt holder 1 has fixed handle portions 4A, 4B that are easy to grip and to apply force to, and further, the tilt can be lifted in stages by operating the movable handle 2. Therefore, even a short worker who has to lift the gate 102 up to chest height or higher can easily open and close the heavy gate 102. Therefore, by using the tilt opening / closing assisting tool set of this embodiment, all workers can be relieved from the physical fatigue and mental pain that accompanies opening and closing work, and as a result, chronic arthritis, muscle pain, etc., caused by physical overuse can be prevented. Furthermore, in the past, depending on the worker's posture, muscle strength, and work location, unexpected problems could occur when lifting the gate with force, etc. However, by using the gate opening / closing assist tool set of this embodiment, such problems can be prevented from occurring. In other words, by using the gate opening / closing assisting tool set of this embodiment, not only workers with normal muscle strength, but also workers with less basic muscle strength, such as elderly people and women, can open and close the gate of a dump truck stress-free and efficiently without any problems.

[0046] Example 2 A second embodiment of the present invention will be described with reference to the drawings. FIG. 17 is a perspective view showing a tilt opening / closing assisting tool set according to a second embodiment of the present invention. As shown in FIG. 17, the tilt opening / closing assisting tool set of this embodiment differs from the first embodiment in that it includes a stand 7 in addition to the tilt holder 1 and the movable handle 2.

[0047] As shown in FIG. 7, the stand 7 includes a large-diameter pole 8 having a foot portion 80 and a small-diameter pole 9 having a connecting portion 90, and is rod-shaped as a whole. The pole 8 is a hollow cylindrical body, and its lower end is connected to and supported by a foot 80 via a shaft 81 . The pole 9 is inserted into the pole 8, and a connecting part 90 is attached to the tip of the pole 9.

[0048] FIG. 18 is a schematic partial cross-sectional view of the stand 7. As shown in FIG. 18, the pole 9 is inserted into the pole 8 so as to be movable up and down. The connecting portion 90 is screwed onto the tip of the pole 9 and is supported by a shaft 91 .

[0049] Such a stand 7 is set to expand and contract only in the expansion direction. That is, the latch mechanism is set so that the pole 9 can be pulled out only upward from the pole 8.

[0050] The latch mechanism is composed of a linear gear portion 92 provided on the pole 9, and a claw portion 83 and a spring 84 provided on the pole 8. Specifically, holes 92a that can engage with the claws 83 are formed at regular intervals along the length of the pole 9. A storage chamber 82 is provided in the pole 8, and the claws 83, each with a 45° arc-shaped lower tip, are stored horizontally in this storage chamber 82. A spring 84 that biases the claws 83 toward the pole 9 is provided behind the claws 83.

[0051] Figure 19 is a partially enlarged cross-sectional view showing the function of the latch mechanism applied to this embodiment, where (a) shows the disengaged state of the straight gear portion 92 and the claw portion 83, and (b) shows the engaged state of the straight gear portion 92 and the claw portion 83.

[0052] As shown in Figure 18, when the hole 92a of the linear gear portion 92 provided on the pole 9 is engaged with the claw portion 83 provided on the pole 8, and the pole 9 is then raised, i.e., extended upward, the rising pole 9 overcomes the biasing force of the spring 84 and pushes the claw portion 83 into the storage chamber 82, as shown in Figure 19(a). As a result, the engagement between the hole 92a and the claw portion 83 is released, i.e., the meshing between the linear gear portion 92 and the claw portion 83 is released. 19(b), the pressing force of the pole 9 against the claw portion 83 is eliminated, and the claw portion 83 is forced to protrude from the storage chamber 82 by the biasing force of the spring 84. As a result, the tip of the claw portion 83 enters the hole 92a of the linear gear portion 92, and the hole 92a and the claw portion 83 engage with each other, so that the linear gear portion 92 and the claw portion 83 are in mesh with each other. As long as the pole 9 is raised from this state in the same manner as above, it can be extended without any resistance. However, if an attempt is made to lower the pole 9, the engagement between the hole 92a of the linear gear portion 92 and the claw portion 83 prevents the pole 9 from lowering. In other words, even if a downward force is applied to the pole 9, it will not lower and will maintain its current length.

[0053] Next, an example of how to use the tilt opening / closing assisting tool set of the second embodiment will be described. Figure 20 is a side view showing how to raise the stand connected to the tilt holder, Figure 21 is a side view showing how to lift the tilt for the first time, Figure 22 is a side view showing how to adjust the holding position of the movable handle for the first time, Figure 23 is a side view showing how to lift the tilt for the second time, Figure 24 is a side view showing how to adjust the holding position of the movable handle for the second time, Figure 25 is a side view showing how to lift the tilt for the third time, Figure 26 is a side view showing how to adjust the holding position of the movable handle for the third time, and Figure 27 is a side view showing how to complete the closing operation of the tilt. This example of use also specifically implements the gate opening / closing method according to the sixth aspect of the present invention.

[0054] 17 and 18, the stand 7 can be detachably magnetically attached to the lower surface 32, which serves as the bottom surface of the holder main body 3 of the tilt holder 1, by a magnet 93 provided on the surface of the connecting portion 90. Therefore, first, as shown in Figure 9, before or after the edge of the tilt 102 is clamped into the holder main body 3 of the tilt holder 1 (execution of the tilt holding process), the connecting part 90 is magnetically attached to the underside 32 of the holder main body 3, as shown by the dotted line in Figure 20, and the stand 7 is attached to the tilt holder 1 (execution of the stand attachment process).

[0055] After the installation of the stand 7 is completed, the gate holder 1 holding the gate 102 is lifted as shown by the solid line, and the stand 7 is erected on the ground 200 .

[0056] Thereafter, as shown in FIG. 21, while stepping with foot F on foot 80 of the upright stand 7, the gate holder 1 holding the gate 102 is lifted as shown by the arrow in the figure (execution of the gate lifting process). Then, the pole 9 connected to the tilt holder 1 is pulled upward from the pole 8, and the stand 7 follows the movement of the tilt holder 1 and extends in the height direction. Then, the tilt holder 1 is lifted up to, for example, about waist height of the worker, and then the force is released. By releasing the lifting force, most of the weight of the tilt 102, tilt holder 1, etc. is applied to the stand 7, and the pole 9 is pushed back into the pole 8 by this weight. However, since the stand 7 only expands and contracts in the extension direction, it does not contract and supports the tilt 102, tilt holder 1, etc. from below, maintaining them at the current lifted position, which is the waist position (execution of the tilt position maintaining process). This relieves the worker from the burden of the weight of the tilt 102, the tilt holder 1, and the like.

[0057] In this state, the worker has both or at least one hand free, so after adjusting the holding position of the left hand L as shown by the arrow in Figure 22 (executing the holding position adjustment process), as shown by the arrow in Figure 23, with foot F stepping on the foot 80 of the upright stand 7, the worker lifts the gate holder 1 holding the gate 102 from waist position to, for example, chest height of the worker in the upright position (executing the gate lifting process). At this time, the stand 7 does not contract, but supports the tilt 102, the tilt holder 1, etc. from below, and maintains the tilt 102, the tilt holder 1, etc. at the current lifted position, which is the chest position (execution of the tilt position maintaining process). Therefore, even when the operator is at this chest position, he is freed from the burden of the weight of the tilt 102, the tilt holder 1, etc.

[0058] In this state, the movable handle 2 is rotated downward as shown by the arrow in FIG. 24, and the holding position of the left hand L is lowered to a height at which it is easy to apply force (execution of the holding position adjustment step).

[0059] Thereafter, as shown in FIG. 25, the tilt 102 is raised to the highest height that the worker can lift (execution of the tilt raising step).

[0060] Then, the tilt 102, the tilt holder 1, etc. are maintained in their current lifted position (execution of the tilt position maintaining process), and after adjusting the holding position of the left hand L as shown in Figure 26 (execution of the holding position adjusting process), the tilt 102 is closed in one go as shown by the arrow in Figure 27 (execution of the tilt lifting process). That is, with the foot 80 of the stand 7 stepped on with the foot F, the gate holder 1 holding the gate 102 can be lifted in one go from its current high position to the loading platform 101 of the dump truck 100, and the gate 102 can be closed. At this time, the stand 7 does not retract and supports the gate 102, gate holder 1, etc. from below, so even if you remove your hand, the gate 102 will not fall in the opening direction. This allows the closing operation of the gate 102 to be completed without any problems.

[0061] As explained in detail above, in the tilt opening / closing assist tool set of this embodiment, the stand 7 always supports from below the tilt holder 1 holding the heavy tilt 102, greatly reducing the burden on the worker when lifting it. Furthermore, the stand 7 can also prevent the tilt holder 1 from falling.

[0062] In this embodiment, the stand 7 and the tilt holder 1 are connected via the magnet 93, but the connecting structure between the stand 7 and the tilt holder 1 is not limited to this. For example, the stand 7 and the tilt holder 1 may be connected by a screw structure. Furthermore, the stand 7 is not limited to being detachable from the tilt holder 1. A stand 7 fixed to the tilt holder 1 may also be used. In addition, in this embodiment, a mechanism can be applied to the stand 7 that allows manual release of the meshed state after the linear gear portion 92 and the claw portion 83 of the latch mechanism have been meshed. The other configurations, actions and effects are the same as those of the first embodiment, and therefore the description thereof will be omitted. [Explanation of symbols]

[0063] 1...Tilt retainer, 2...Movable handle, 3...Retainer main body, 4A, 4B...Fixed handle portion, 5...Engagement mouth portion, 6...Arm portion, 7...Stand, 8, 9...Pole, 31...Upper surface, 32...Lower surface, 3...Back surface, 34...Engagement portion, 35...Side, 35...Corner portion, 37...Adjustment plate material, 38, 93...Magnet, 41...Upper end portion, 42...Lower end portion, 43...Tip portion, 50...Opening, 51...Groove, 53...Gear, 53a...Tooth, 54, 83...Claw portion, 55, 81, 91...Axis, 56, 84...Spring, 80...Foot portion, 82...Storage chamber, 90...Connecting portion, 92...Straight gear portion, 92a...Hole, 100...Dump truck, 101...Loading platform, 102,102'...tilt, 103...hinge, 200...ground, F...foot, L...left hand, R...right hand.

Claims

1. A gate opening / closing auxiliary tool set including a gate holder having a grip-like fixed handle portion for holding the edge of a gate of a truck, and an arm-like movable handle that can be detachably connected to the gate holder, The tilt retainer has a retainer body portion that is substantially U-shaped in side view and can grip the edge portion of the tilt retainer, and the fixed handle portion that is fixed to the back side of the retainer body portion, The movable handle has an engagement mouth portion that can be engaged with an engagement portion that is provided on the back side of the retainer body portion and faces in a direction approximately perpendicular to the side surface of the retainer body portion, and an arm portion that has the engagement mouth portion at its tip, and can rotate in only one direction around the engagement point when the engagement mouth portion is engaged with the engagement portion of the retainer body portion. It is characterized by:

2. The tilt opening / closing assisting tool set according to claim 1, a rod-shaped stand whose tip end is attached to the bottom surface of the holder body of the tilt holder and which can be set to expand and contract only in the extension direction; It is characterized by:

3. The tilt opening / closing assisting tool set according to claim 2, The tip of the stand can be detachably attached to the bottom surface of the holder body of the tilt holder. It is characterized by:

4. The tilt opening / closing assisting tool set according to claim 1, a thickness adjusting plate member that is inserted into the retainer body portion to make the internal thickness of the retainer body portion approximately equal to the thickness of the gate; It is characterized by:

5. A method for closing a gate of a truck using the gate opening / closing auxiliary tool set according to claim 1, a gate holding step of holding an edge of the gate by a retainer main body of the gate retainer; a tilt lifting step of lifting the holder body holding the tilt to a desired height using a fixed handle portion of the tilt holder and an arm portion of the movable handle with the engagement mouth portion engaged with the engagement portion of the holder body after the tilt holding step is completed; and a holding position adjusting step of rotating the movable handle after the tilt lifting step is completed so that the holding position of the arm part is lower by a desired height than the current holding position. It is characterized by:

6. The gate opening / closing method according to claim 5, a stand attachment step of attaching a tip end of the stand to a bottom surface of the holder body of the tilt holder in a state in which the stand is set so as to expand and contract only in the extension direction before or after the tilt holding step is performed; and a tilt position maintaining step of, after the stand mounting step is completed, performing the tilt lifting step while extending the stand in a height direction in a state where the stand is in an upright state, thereby maintaining the holder main body portion in a lifted position by the stand while gripping the edge of the tilt. It is characterized by:

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