JP4039915B2 - Road stabilizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load stabilizer that prevents a load from being shifted in a forklift.
[0002]
[Prior art]
As shown in FIG. 9, in the conventional load stabilizer 1, the load stabilizer 1 can be raised and lowered by a hydraulic cylinder 2 provided on a lift bracket 6 side to which a fork 7 of a forklift is attached. The load stabilizer 1 includes an arm 4 that is driven up and down by a hydraulic cylinder 2 and a flat pressing plate 5 that is fixed to the lower end of the arm 4. In the hydraulic cylinder 2, the pressing plate 5 moves up and down together with the arm 4, and the upper surface of the load 9 is pressed by the pressing plate 5 to prevent load displacement.
[0003]
Next, the operation of the conventional load stabilizer 1 will be described with reference to FIG. First, as shown in FIG. 9A, the fork 7 is inserted into the pallet 8 with the presser plate 5 of the load stabilizer 1 raised during loading. Next, as shown in FIG. 9B, after raising the fork 7 and lifting the load 9 (after so-called ground cutting), the presser plate 5 is lowered to press the load 9 from above. With the fork 7 lifting the load 9 and holding the load 9 with the holding plate 5, the load 9 is conveyed as shown in FIG.
[0004]
And it transfers to a predetermined place and transfers to the operation of unloading. That is, as shown in FIG. 9 (d), the presser plate 5 is raised to release the hold of the load 9, and then the fork 7 is lowered to ground the load 9 (see FIG. 9 (e)). Next, the fork 7 is removed from the pallet 8.
[0005]
[Problems to be solved by the invention]
However, while the load 9 is being transported, it is pressed by the press plate 5 and no load displacement occurs. However, in the conventional load stabilizer 1, before the load 9 is pressed by the press plate 5, as shown in FIG. Since the load 9 is lifted by the fork 7, the load is shifted by a slight impact or vibration. Also, as shown in FIG. 9 (e), since the holding plate 5 is released from the load 9, and then the fork 7 is lowered and the load 9 is grounded, the load shifts due to slight impact and vibration of the grounding. There was a problem of waking up.
[0006]
Further, when the load 9 is not pressed by the pressing plate 5 of the load stabilizer 1, that is, when the load 9 is unloaded or unloaded, the load as shown in FIG. Problems arise. That is, after the fork 7 is inserted into the pallet 8 as shown in FIG. 10A, the holding plate 5 of the load stabilizer 1 is lowered as shown in FIG. Then, as shown in FIG. 10 (c), when the fork 7 is raised and the load 9 is lifted, the presser plate 5 is raised by that amount. For this reason, there is a problem that the pressing plate 5 is separated from the luggage 9 or loses the pressing force.
[0007]
Further, as shown in FIG. 10D, when the pressing plate 5 of the load stabilizer 1 is pressing the load 9 during the operation of lowering the fork 7 at the transport destination, as shown in FIG. There is a possibility that the load 9 is crushed by the holding plate 5 or the fork 7 does not descend and the fork 7 does not leave the pallet 8. Thus, for example, in the case of a load 9 such as a printed sheet that causes a load shift even with a slight impact or vibration, the holding plate 5 of the load stabilizer 1 for unloading (ground cutting) or unloading (grounding) is used. There was a problem that the load was shifted due to the operation while not being held down.
[0008]
The present invention has been provided in view of the above-described problems, and an object of the present invention is to provide a load stabilizer that does not cause a load shift from unloading by a fork to unloading.
[0009]
[Means for Solving the Problems]
Therefore, in the load stabilizer according to the first aspect of the present invention, and lifting at the same time as the fork in response to the lifting of the forks with being vertically movably driven relative fork, stacked on the pallet lifting at the fork In a load stabilizer having a pressing plate that presses the upper surface of the load, a base plate that moves up and down as the load stabilizer moves up and down is slidable vertically with respect to the base plate and descends to a predetermined height. The shaft is regulated, the pressing plate connected to the lower side of the shaft, the spring interposed between the lower surface of the base plate and the upper surface of the pressing plate, and the base plate is lowered first limiter which is turned on by the shaft that rises against the spring force of the spring by press-contact of luggage of the pressing plate A switch consists of a second limit switch which is turned on by the shaft by further increase of the shaft, when pressed against the package by the pressing plate before lifting the load by the forks, presser luggage by the plate The pressing contact is detected by turning on the first limit switch and turning on the second limit switch due to the rise of the shaft as the base plate is lowered, and when the fork is lifted from the detection state, At the same time, although the pressing plate is raised, the pressing of the load by the pressing plate is maintained, so that the second limit switch is turned off and the first limit switch is turned on when the shaft is lowered as the base plate is raised. It is detected by.
[0010]
With this configuration, before the fork is inserted into the pallet and the fork is raised, the load stabilizer is lowered until the second limit switch is turned on and the load is pressed against the holding plate, and then the second limit switch is turned off. In the state where the first limit switch is turned on, the pressing of the load by the holding plate is confirmed and the load is conveyed. Then, grounding the pallet is lowered fork while pressed against the package by plate presser in the state in which the load stabilizer lowered. When the fork is lowered, the load stabilizer is also lowered at the same time, so that the base plate is lowered and the shaft rises against the spring force of the spring against the base plate to turn on the second limit switch. When the second limit switch is turned on, the lowering of the fork is stopped, and then the load stabilizer is raised to release the pressing contact with the load by the pressing plate. Luggage Thus, the pressing plate of the load stabilizer from load pickup until unloading has maintained a state in which pressed against the upper surface of the luggage, therefore, cause the sheet or the like which is printed, a load shift at a slight shock or vibration also reliably prevent cargo displacement there is, also, the time of unloading, or crushed luggage can fork to solve the problem that occurred prior that does not come from the pallet without falling.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a side view of the load stabilizer 12 attached to the lift bracket, FIG. 2 is a front view of the load stabilizer 12, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is a plan view of the load stabilizer 12. Each is shown.
[0012]
As is well known, a forklift is provided with a mast device at the front, and a lift bracket 53 in which a pair of forks 52 is attached to an inner mast 51 that can be raised and lowered. As shown in FIG. 2, a hydraulic cylinder 54 is provided on the upper portion of the lift bracket 53, and the load stabilizer 12 is provided so as to be raised and lowered via a chain 55 as the rod of the hydraulic cylinder 54 is raised and lowered. As shown in FIG. 3, the lower end portion of the chain 55 and the connecting portion 13 provided on the rear portion of the upper portion of the load stabilizer 12 are connected to each other, and concave grooves are provided on the back surfaces on both sides of the connecting portion 13. A guide portion 57 is provided.
[0013]
As shown in FIG. 4, a protrusion 61 is provided in the vertical direction of the front surface of the frame body 60 on both sides of the lift bracket 53, and the guide 57 is fitted into the protrusion 61 so that the protrusion The guide portion 57 is slidable along the strip portion 61, and the load stabilizer 12 can be raised and lowered. Further, arms 14 are provided so as to protrude from both sides of the front surface of the connecting portion 13, and a substantially square-shaped frame 15 is fixed to the lower surface of the front end of the arm 14. A base plate 16 is disposed on the lower surface of the frame body 15, and as shown in FIG. 5, a shaft 20 is provided at the center portion of the base plate 16 via a bush 17. The lower end of the shaft 20 and a connecting piece 22 projecting from the center of the upper surface of the flat pressing plate 21 are swingably connected. Further, a cap 24 is covered with a bolt 23 on the upper portion of the shaft 20, and the shaft 20 and the pressing plate 21 are supported so as to be slidable in the vertical direction with respect to the base plate 16. Further, the lower end surface of the cap 24 is in contact with the upper surface of the bush 17, thereby restricting the downward movement.
[0014]
Shafts 25 and 26 are arranged on both sides of the shaft 20 so as to be slidable in the vertical direction with respect to the base plate 16, and support plates 27 are respectively provided below the shafts 25 and 26. Coil springs 33 are interposed between the protrusions 30 provided on the lower surface of the support plate 27 and the protrusions 31 provided on the upper surface of the holding plate 21.
[0015]
FIG. 6 shows a state in which the shafts 25 and 26 are attached to the base plate 16. The shafts 25 and 26 can slide in the vertical direction within the linear bush 33 fixed to the base plate 16. A cap 35 is covered with a bolt 34 on the upper portion of 26. The lower end surface of the cap 35 abuts on the upper surface of the linear bush 33, thereby restricting the downward movement of the shafts 25 and 26. An upper limit switch 37 is disposed on the base plate 16 via the bracket 36 above the left shaft 25 in FIG. 6. When the shaft 25 moves upward, the upper limit switch 37 contacts the actuator 40. It comes to turn on. Also, a lower limit switch 42 is disposed on the base plate 16 via the bracket 41 above the other shaft 26, and the lower limit switch 42 is disposed at a position below the upper limit switch 37. ing. When the shaft 26 moves upward, the lower limit switch 42 is turned on by contacting the actuator 43.
[0016]
Also, as shown in FIG. 5, the upper surface opening of the frame 15 is covered with a cover 44, and a cushion material 45 such as a rubber plate is arranged on the lower surface of the holding plate 21 so as not to damage the load. It is set up.
[0017]
FIG. 7 shows a schematic diagram in which the configurations of FIGS. 5 and 6 are integrated for convenience of explanation, and the pressing force of the load plate 12 of the load stabilizer 12 against the load is adjusted by the amount of deflection of the spring 33. I have to. Further, the stroke of the spring 33 is made large, and the stroke detection is performed in the upper and lower two stages of the upper limit switch 37 and the lower limit switch 42. Further, when the pressing plate 21 of the load stabilizer 12 is not pressing the load 70, the pressing plate 21 is urged downward by the spring force of the spring 33. The upper portions of the shafts 25 and 26 are positioned below the upper limit switch 37 and the lower limit switch 42, respectively, and the upper limit switch 37 and the lower limit switch 42 are in the off state.
[0018]
Next, an operation for unloading and unloading the load 70 will be described with reference to FIG. First, as shown in FIG. 8A, a fork 52 of a forklift is inserted into a pallet 71 on which a load 70 is loaded. At this time, since the holding plate 21 is positioned below the base plate 16, both the upper limit switch 37 and the lower limit switch 42 are off. Next, as shown in FIG. 8 (b), the hydraulic cylinder 54 is driven to lower the load stabilizer 12 before loading (before the ground cutting), that is, before raising the fork 52. When the load stabilizer 12 is lowered, the holding plate 21 comes into contact with the upper surface of the load 70, and when the load stabilizer 12 is further lowered, the shafts 25, 26 resist the spring force of the spring 33 and the shafts 25, 26 are moved to the base plate 16. Will rise against. Then, the shaft 26 hits the actuator 43 of the lower limit switch 42 to turn on the lower limit switch 42 (see FIG. 7), and the load is applied until the shaft 25 hits the actuator 40 of the upper limit switch 37 and the upper limit switch 37 is turned on. The stabilizer 12 is lowered.
[0019]
When the upper limit switch 37 is turned on, the descent of the load stabilizer 12 is stopped, and the fork 52 is raised (ground cutting). As shown in FIG. 8C, when the fork 52 is lifted, the load stabilizer 12 is also lifted as the fork 52 is lifted, so that the pressing plate 21 is lowered by being biased by the spring force of the spring 33. Since the upper surface of the load 70 is pressed by the lowering of the presser plate 21 and the shaft 25 is simultaneously lowered, the upper limit switch 37 is turned off. Although the upper limit switch 37 is turned off, the lower limit switch 42 is in an on state, and the holding plate 21 of the load stabilizer 12 presses the load 70 in response to the ON signal of the lower limit switch 42. Confirming or recognizing that 70 is held. In this state, the luggage 70 is conveyed.
[0020]
Next, as shown in FIG. 8 (d), when unloading, the fork 52 is lowered while the pressing plate 21 of the load stabilizer 12 holds down the load 70 to ground the pallet 71. In this case, the load stabilizer 12 also descends as the fork 52 descends. However, since the spring 33 is compressed and the presser plate 21 rises, the load 70 is not crushed by the presser plate 21 as in the prior art. When the fork 52 is further lowered after the lower surface of the pallet 71 is in contact with the floor surface, the base plate 16 is lowered as shown in FIG. Ascends against the plate 16. Then, when the upper limit switch 37 by the shaft 25 is turned on, the lowering of the fork 52 is stopped. In this state, the fork 52 is separated from the ceiling surface of the pallet 71. Then, as shown in FIG. 8 (e), after the load 70 is grounded, the load stabilizer 12 is raised to release the pressing plate 21 from the upper surface of the load 70 to release the load 70. Thereafter, the fork 52 is removed from the pallet 71.
[0021]
As described above, in the present embodiment, since the load 70 is pressed by the pressing plate 21 of the load stabilizer 12 from before loading to unloading, the printed sheet or the like is loaded with slight impact or vibration. Even with the load 70 that causes a shift, it is possible to reliably prevent the load shift. In addition, it is possible to solve the problems that have occurred in the past, such as crushing the load or unloading the fork from the pallet when unloading.
[0022]
Although FIG. 7 has been described as a schematic diagram, a configuration as shown in FIG. 7 may actually be used. That is, one shaft 25 protrudes from the upper surface of the holding plate 21, and the shaft 25 is slidably arranged with respect to the base plate 16, and the spring 33 is interposed in the shaft 25, As in the previous embodiment, the upper limit switch 37 and the lower limit switch 42 may be arranged.
[0023]
【The invention's effect】
According to the load stabilizer of the present invention, the load stabilizer holding plate keeps pressing the upper surface of the load from unloading to unloading, so that the printed sheet or the like has a slight impact or vibration. Even when the load causes a load slippage, it is possible to reliably prevent the load slippage. Also, when unloading, the conventional problem that the load is crushed or the fork does not descend and does not come off the pallet is solved. can do.
[Brief description of the drawings]
FIG. 1 is a side view of a load stabilizer attached to a lift bracket side in an embodiment of the present invention.
FIG. 2 is a front view of a load stabilizer attached to the lift bracket side in the embodiment of the present invention.
3 is a cross-sectional view taken along line AA of FIG. 2 in the embodiment of the present invention.
FIG. 4 is a plan view of a load stabilizer attached to the lift bracket side in the embodiment of the present invention.
FIG. 5 is a cross-sectional view of a lift bracket in the embodiment of the present invention.
FIG. 6 is an enlarged sectional view showing an arrangement state of the upper limit switch and the lower limit switch in the embodiment of the present invention.
FIG. 7 is a diagram for explaining an operation in the embodiment of the present invention.
FIG. 8 is an operation explanatory diagram from unloading to unloading according to the embodiment of the present invention.
FIG. 9 is an operation explanatory diagram of a conventional example.
FIG. 10 is an operation explanatory diagram of a conventional example.
[Explanation of symbols]
12 Road Stabilizer 16 Base Plate 21 Presser Plate 25 Shaft 26 Shaft 32 Spring 37 Upper Limit Switch (Second Limit Switch)
42 Lower limit switch (first limit switch)
52 Fork 70 Luggage 71 Pallet

Claims (1)

And lifting at the same time as the fork in response to the lifting of the forks with the freely driven lift against the fork, load stabilizer comprises a pressing plate which presses against the upper surface of the luggage stacked on the pallet lifting at the fork In
A base plate that moves up and down according to the lifting and lowering of the load stabilizer, a shaft that is slidable in the vertical direction with respect to the base plate and that is controlled to descend to a predetermined height, and is connected to the lower side of the shaft. A pressure plate, a spring interposed between the lower surface of the base plate and the upper surface of the pressure plate, and the spring force of the spring against the spring force by lowering the base plate and pressing the load on the pressure plate A first limit switch that is turned on at the shaft that rises, and a second limit switch that is turned on at the shaft by further raising of the shaft,
When the load is pressed with the pressing plate before the load is lifted with the fork, the pressing of the load with the pressing plate causes the first limit switch to be turned on and second when the shaft rises as the base plate is lowered. Detected by turning on the limit switch,
When the fork is lifted from the detection state, the press plate is raised simultaneously with the rise of the fork, but the pressing of the load by the press plate is maintained. The load stabilizer is detected by turning off the second limit switch and turning on the first limit switch due to lowering .

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