JP3771891B2 - Low-floor pneumatic lift - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low-floor type pneumatic lift that raises and lowers an upper frame in a horizontal state by an air bag.
[0002]
[Prior art]
In general, the lifting mechanism of the lifting platform has various structures from a large hydraulic type to a small electric type. These are large drive sources installed below the lifting surface, and cannot be lowered to about 30 cm or less due to the structure. In addition, when the drive source is arranged next to the lifting surface, it requires a much larger installation area than the lifting surface, which requires a heavy mechanism, and both are difficult to move and change the floor size. is there. In addition, the conventional lifting platform is not flexible in structure, and there is a problem that the lifting mechanism or the lifting object is damaged when the lifting object falls on the lifting surface.
[0003]
In addition, some conventional care beds have a structure in which a part of the bed can be tilted and can get up from a sleeping position, but there is no structure that can raise and lower from a position close to the floor to a high position. For example, a caregiver who has moved in a wheelchair is moved to a bed at a high bed position, then lowered to a position close to the floor, and then sleeps on a futon laid in a Japanese-style room. However, the conventional lifting mechanism has a problem that it cannot be lowered to a low position.
[0004]
[Problems to be solved by the invention]
The present invention improves the above problems, the structure is simple, the object to be lifted up and down in a horizontal state from the floor surface to a high position , and even when the air in the air bag escapes because it is locked at the rising position, The upper frame is supported to prevent the risk of falling. In addition, there is no need for incidental equipment work and it can be moved easily, and the cushioning of the lifting surface prevents damage due to falling objects, etc., and provides a low-floor pneumatic lifting platform that is particularly effective for nursing beds. Is.
[0005]
[Means for Solving the Problems]
The low-floor type pneumatic lifting platform according to claim 1 of the present invention is such that a pillar is erected at each corner portion of a rectangular lower frame, and a boss provided at each corner portion of the rectangular upper frame, The support shaft is inserted in a vertically movable manner, and an air bag is interposed between the lower frame and the upper frame, and a stopper shaft is rotatably connected in the vicinity of the support frame of the lower frame. A roller is attached to the upper end, and the roller is inserted into a roller guide attached to the upper frame. When the roller reaches the highest position on the upper frame, the stopper shaft rises and the upper end roller is inserted and locked. A U-shaped hook is pivotally attached to form a roller lock mechanism, and the upper frame is raised and lowered in a horizontal state by the expansion and contraction of the airbag. Both is characterized in that so as to lock the stopper shaft roller lock mechanism when the upper frame has reached the highest position.
[0006]
The low-floor type pneumatic lifting platform according to claim 2 of the present invention is configured such that upper and lower rings are attached to the outer periphery of the intermediate portion of the airbag at intervals in the vertical direction, and a plurality of coil springs are radially disposed on the outer periphery of the ring. The end of the coil spring attached to the upper ring is connected to the upper frame, and the end of the coil spring attached to the lower ring is connected to the lower frame. It is characterized by adding a tensile force of .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In FIG. 1, reference numeral 1 denotes a low-floor type pneumatic lifting platform, which has a support column 3 standing at each corner of a rectangular lower frame 2 and is attached to each corner of the rectangular upper frame 4. The support 3 is inserted into the provided boss 5 so as to be movable up and down, and air bags 6 and 6 are interposed between the lower frame 2 and the upper frame 4.
[0008]
The lower frame 2 and the upper frame 4 are formed in a square frame shape with square pipes, and bottom plates 8 and 8 are attached to the lower frame 2, and top plates 9 and 9 are attached to the upper frame 4. Cylindrical airbags 6, 6 are interposed between 8 and the upper surface plate 9. Further, an upper connecting plate 7 is attached to the upper part of the adjacent columns 3 and 3 erected on the corner portion of the lower frame 2.
[0009]
A stopper shaft 11 shown in FIG. 2 is rotatably attached to the bearing 12 inside each corner portion of the lower frame 2. A plate-like block 13 is attached to the upper portion of the stopper shaft 11, and rollers 14 and 14 are attached to both sides thereof. A roller guide 15 having an opening at the center of the bottom surface of the square pipe is attached to the bottom of the upper frame 4 on the short side, and the roller 14 rolls left and right on the inside.
[0010]
A roller lock mechanism 17 is provided on the end side of the roller guide 15 as shown in FIGS. In the roller lock mechanism 17, a U-shaped hook 18 attached to the end side of the roller guide 15 is rotatably supported by a shaft 19, and a pin 20 protrudes laterally from the hook 18. . Reference numeral 22 denotes a guide block, which has a hemispherical guide groove 23 formed on the tip side, and a pin 20 protruding from the hook 18 is slidably inserted into the guide groove 23. The guide block 22 is connected to the tip of the lever 24. Further, the lever 24 is connected to an air cylinder 25 as shown in FIG. 5, and the guide block 22 moves back and forth by the expansion and contraction of the cylinder, and the hook 18 moves up and down. It is designed to rotate.
[0011]
Pulleys 27 are attached to the bottom surface of the upper connecting plate 7 and the lower frame 2 on both sides and in the middle. As shown in FIG. 6, the pulleys 27 attached to both ends of the upper connecting plate 7 and the lower frame 2 below pass through the upper frame 4 and wrap around the wire 28 to form a concave closed loop. The same height portion of the wire 28 that moves up and down in the same direction is fixed to the upper frame 4 by a wire fixing portion 29. That is, when the upper frame 4 moves up and down, the wire 28 connected by the wire fixing portion 29 moves in the concave closed loop, and a horizontal balance can be achieved in the left-right direction.
[0012]
Further, a protrusion 31 is provided on the upper surface of the upper frame 4, and a limit switch 32 is provided on the bottom surface of the upper connecting plate 7 facing the upper frame 4, the upper frame 4 is raised, and the protrusion 31 hits the limit switch 32. Then, an air pump (not shown) is stopped.
[0013]
Also, as shown in FIG. 1, a concave closed loop is formed between the upper connecting plates 7 and 7 on both ends along the longitudinal direction by winding a wire 28 around the pulley 27 as in FIG. The same height portion of the wire that moves up and down in the same direction is fixed to the upper frame 4 by the wire fixing portion 29 so as to achieve a horizontal balance in the front-rear direction.
[0014]
In the low-floor type pneumatic lift having the above-described configuration, when a raising button of an operation switch (not shown) is pressed, pressurized air is supplied to the airbags 6 and 6 and expands upward. Since the air bags 6 and 6 are interposed between the lower frame 2 and the upper frame 4, the upper frame 4 is pushed up to rise. At this time, the bosses 5 attached to the respective corner portions of the upper frame 4 are guided by the pillars 3 erected at the respective corner portions of the lower frame 2 and rise in a horizontal state.
[0015]
Further, as the upper frame 4 is raised, the wire 28 wound around the pulley 27 attached to both ends of the upper connecting plate 7 and the lower frame 2 below to form a concave closed loop moves. Since the upper frame 4 is fixed by the wire fixing portion 29 at the same height portion where the wire 28 penetrates and moves up and down in the same direction, it can be lifted while maintaining the horizontal state on the left and right.
[0016]
Similarly, between the upper connecting plates 7, 7 on both ends along the longitudinal direction of the upper frame 4, a wire 28 is similarly wound around the pulley 27 to form a concave closed loop. Since the same height portion that moves up and down in the same direction is fixed to the upper frame 4, it can rise while maintaining the horizontal state in the front-rear direction. That is, even when the expansion of the airbags 6 and 6 is irregular or the load of the lifted object applied to the upper frame 4 is biased, it can be lifted while maintaining a horizontal balance in the front-rear and left-right directions. It has become.
[0017]
Further, as the upper frame 4 is raised, the stopper shaft 11 which is rotatably attached to the bearing 12 of the lower frame 2 has the upper roller 14 attached to the bottom surface of the upper frame 4 as shown in FIG. It gradually rises while rolling in the roller guide 15.
[0018]
When the upper frame 4 approaches the highest position, the block 13 to which the roller 14 is attached fits into the U-shaped hook 18 of the roller lock mechanism 17, and when the upper frame 4 is further raised, the air cylinder 25 retracts the guide block 22, and FIG. As shown, the opening of the hook 18 faces downward, and the block 13 is locked. At the same time, the protrusion 31 shown in FIG. 6 hits the limit switch 32 and the air pump stops. Therefore, even if the air in the air bags 6 and 6 escapes with the object to be lifted and lowered, since the upper frame 4 is supported by the four stopper shafts 11, the danger of falling can be prevented.
[0019]
The low-floor type air lift 1 is cushioned because it is supported by the air bags 6 and 6 even if the object to be lifted is dropped on the upper frame 4 and absorbs an impact to prevent damage. can do.
[0020]
In the case of lowering, when a lowering button of an operation switch (not shown) is pressed, it is once raised to the highest position, and the air cylinder 25 attached to the upper frame 4 advances to push out the lever 24, and the guide attached to the tip. Block 22 advances. As shown in FIG. 3, the guide block 22 is formed with a heft-shaped guide groove 23, and the pin 20 inserted therein is pushed up so that the hook 18 rotates.
[0021]
As a result, when the lock of the roller 14 is released and the air in the air bags 6 and 6 is discharged and contracted by the weight of the upper frame 4 and the object to be lifted, the upper frame 4 is lowered and the roller 14 is moved. The roller shaft 15 rolls and the stopper shaft 11 falls. When the upper frame 4 is lowered to the lowest position, the airbags 6 and 6 are folded and can be lowered to a height of about 10 cm from the floor surface.
[0022]
FIG. 7 shows another embodiment of the present invention . Rings 37 and 37 are attached at intervals above and below the middle portion of the air bag 6 having a cylindrical shape. A plurality of coil springs 38 are attached radially, and end portions thereof are connected to the lower frame 2 and the upper frame 4, respectively, and a vertical tensile force is applied to an intermediate portion of the air bag 6 by the coil springs 38 and 38. Is.
[0023]
As shown in FIG. 7A, when air is supplied to the airbag 6 with the upper frame 4 lowered, a vertical tension force is applied to the intermediate portion of the airbag 6 by a coil spring 38. Therefore, the upper and lower portions of the airbag 6 remain deflated, and first, the middle portion surrounded by the rings 37 and 37 starts to swell in the vertical direction. When air is further supplied, as shown in FIG. 7 (B), the middle part surrounded by the rings 37, 37 is completely inflated, and finally the upper and lower parts of the air bag 6 are inflated as shown in FIG. 7 (C) . .
[0024]
When the upper frame 4 is lowered by removing the air from the air bag 6, the upper and lower parts of the air bag 6 are first deflated, and then the middle part is deflated vertically. come. Therefore, without the ring 37 and the coil spring 38, the airbag 6 may expand in an irregular shape and the upper frame 4 may not rise horizontally. Since a tensile force is applied in the direction, the upper frame 4 can be moved up and down while maintaining a horizontal state by expanding vertically upward.
[0025]
In the above description, the case where the cylindrical airbag 6 is attached has been described. However, a bellows-like airbag may be used, and the structure is not limited to two but may be one or three or more. Moreover, although the case where the limit switch 32 is used as a sensor for detecting the highest position of the upper frame 4 has been described, a proximity sensor such as an optical sensor may be used. Further, a structure in which a bellows-like cover is attached around the lower frame 2 and the upper frame 4 so that the air bag 6 cannot be seen from the outside may be used. Moreover, although it showed about the case where it applied to raising / lowering of components, a product, etc. as a raising / lowering bed , or a nursing bed , it can apply widely also to a level | step difference resolver etc.
[0026]
【The invention's effect】
As described above, according to the low-floor type pneumatic lifting platform according to the first aspect of the present invention, a support column is erected at each corner portion of the lower frame, and the boss provided at each corner portion of the upper frame is connected to the boss. The support frame was inserted in a freely movable manner, and an air bag was interposed between the lower frame and the upper frame, and the upper frame was raised and lowered in a horizontal state by the expansion and contraction of the air bag. When the air bag is lowered, the air bag is folded and can be lowered to a height of about 10 cm from the floor surface. Further, even if the object to be lifted is dropped on the upper frame, it is cushioned because it is supported by the air bag, and it is possible to absorb the impact and prevent damage.
[0027]
In addition, since the structure is simple and light, and the auxiliary equipment is only a small air pump and control device that can be carried, it is easy to install and move. Moreover, since the lower part of the lower frame can be opened, by inserting the tip of a cart or a wheelchair here, it is easy to mount or remove it from the lifting platform.
[0028]
Furthermore in the vicinity of struts of the lower frame, connecting the stopper shaft rotatably, mounted a row La at the upper end of the stopper shaft, and inserted the rows La in the mounting roller guides the upper frame, the upper frame is provided with the Rarokku mechanism for locking the rows La upon reaching the highest position, even missing airbags air while carrying the object lifting thereof, the upper frame with a stopper shaft is supported, the risk of falling Can be prevented.
[0029]
Further, according to the low floor type pneumatic lift of claim 2 , the upper and lower rings are attached to the outer periphery of the intermediate portion of the airbag at intervals in the vertical direction, and a plurality of coil springs are radially disposed on the outer periphery of the ring. The end of the coil spring attached to the upper ring is connected to the upper frame, and the end of the coil spring attached to the lower ring is connected to the lower frame. Therefore, when air is supplied to the airbag, the middle part surrounded by the upper and lower rings swells first, and finally the upper and lower parts of the airbag 6 swell. Also, when the air is removed, the upper and lower parts of the airbag are first deflated, and then the middle part is deflated vertically, so the airbag does not become irregularly shaped and the upper frame is held in a horizontal state. Can be raised and lowered.
[Brief description of the drawings]
FIG. 1 is a perspective view of a low-floor type pneumatic lift according to an embodiment of the present invention.
2 is a perspective view showing a stopper shaft attached to a corner portion of the lifting platform of FIG. 1; FIG.
FIG. 3 is a sectional view showing a stopper shaft and a roller lock mechanism in a state where an upper frame is raised.
FIG. 4 is a cross-sectional view showing the stopper shaft and the roller lock mechanism in a state where the upper frame reaches the highest position.
FIG. 5 is a perspective view showing the stopper shaft and the roller lock mechanism in a state where the upper frame reaches the highest position.
FIG. 6 is an explanatory diagram for explaining the operation of a horizontal lifting mechanism using a pulley and a wire wound around the pulley in a closed loop.
FIG. 7A is a front view in which rings are attached to the upper and lower parts of the middle of an air bag according to another embodiment of the present invention, and the ring is connected to the upper and lower frames through coil springs. back front view middle portion is shows the inflated state of a front view that shows the (C) state inflated to completely airbag.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Low floor type pneumatic lifting platform 2 Lower frame 3 Support | pillar 4 Upper frame 5 Boss 6 Air bag 7 Upper connection plate 8 Bottom plate 9 Top plate 11 Stopper shaft 13 Block 14 Roller 15 Roller guide 17 Roller lock mechanism 18 Hook 20 Pin 22 Guide block 25 Air cylinder 27 Pulley 28 Wire 29 Wire fixing part 31 Projection part 32 Limit switch 37 Ring 38 Coil spring

Claims (2)

A pillar is erected at each corner of the rectangular lower frame, and the pillar is inserted into a boss provided at each corner of the rectangular upper frame so that it can be raised and lowered. The lower frame and the upper frame A stopper shaft is pivotally connected in the vicinity of the lower frame support with an air bag interposed between them, and a roller is attached to the upper end of the stopper shaft, and this roller is attached to the upper frame. The stopper shaft rises when it reaches the highest position on the upper frame, and a U-shaped hook that is locked by inserting the roller at the upper end of the stopper shaft is pivotally attached to the roller lock mechanism. The upper frame is moved up and down in a horizontal state by the expansion and contraction of the air bag, and the upper frame reaches the highest position when the upper frame reaches the highest position. Low-floor type pneumatic lifting table, characterized in that so as to lock the stopper shaft Rarokku mechanism. The upper and lower rings are attached to the outer periphery of the middle part of the air bag with a vertical interval, and multiple coil springs are attached radially to the outer periphery of the ring, and the end of the coil spring attached to the upper ring is attached to the upper frame. Further, the ends of the coil springs attached to the lower ring are respectively connected to the lower frame, and a tensile force in the vertical direction is applied to the intermediate portion of the airbag by the coil springs. Floor type air lift.