JP3713186B2 - Pull-out lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a lifting device used for loading and unloading a fire pump by installing it on a fire-fighting vehicle. In particular, it does not take up any space for installation, and is installed on a loading platform such as a small wagon car to load or unload a load. The present invention relates to a pull-out type lifting device that can perform work smoothly.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, trucks, nursing care vehicles, and the like that are equipped with a lifting device so that goods and wheelchairs can be smoothly loaded and unloaded are known. However, many of them have a large structure combining a link mechanism, a hydraulic device, and the like, and are expensive in terms of space for installation.
[0003]
Thus, as a simple lifting device installed on the loading platform of a vehicle, for example, the one shown in FIG. 15 has been developed and put into practical use. As shown in the figure, this apparatus includes a rail R fixed to a vehicle bed, a traveling carriage C provided so as to be movable back and forth along the rail, a support P fixed to the traveling carriage, and a vertical movement along the support. It is comprised from the L-shaped raising / lowering stand D etc. which were provided so that movement was possible. Among them, the traveling carriage C is provided with a screw shaft S that is driven to rotate by a motor (not shown) along the column P, and a portion of the lifting platform D is screwed to the screw shaft S. And according to this raising / lowering apparatus, the traveling carriage C is moved to the arrow direction shown in the figure, the raising / lowering stage D is protruded from the rear end of the loading platform, and the screw shaft S is rotationally driven in this state, and the lifting platform D on which the load is placed. Can be raised and lowered along the rear end surface of the loading platform.
[0004]
[Problems to be solved by the invention]
However, in the lifting device as described above, a large bending moment acts on the screw shaft when loading and unloading the load, so that when the heavy load is loaded and unloaded, the smooth operation of the lifting platform is impaired. . In addition, the column must be tilted to the opposite side of the platform and the length of the traveling carriage must be set large so that the platform can be supported properly against bending moments. It requires a larger space for installing this apparatus than its size.
[0005]
In addition, since the lifting platform moves up and down close to the rear end surface of the loading platform, it is necessary to load and unload luggage on the lifting platform in the immediate vicinity of the vehicle body. For this reason, the work is difficult to perform, and there is a possibility that the vehicle body may be damaged during the work.
[0006]
The present invention has been made in view of the circumstances as described above, and the intended processing is a simple lifting device capable of smoothly loading and unloading relatively large loads without requiring a large installation space. Is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention achieves the above-described object by a guide rail 5 fixed to a high surface such as a loading platform of a vehicle, a traveling platform 6 that is supported by the guide rail so as to be movable back and forth, and a front and rear by the traveling platform. The lifting device includes a pedestal 7 that is supported so as to be movable, and the pedestal 7 protrudes from the traveling base 6 by a predetermined length from a position where the front portion engages with a portion of the traveling base 6. The traveling platform 6 supports the rear frame 6B that is pulled out from the rear to the front of the guide rail 5 and the rear portion of the base 7 that is pulled out to a predetermined position. The front frame 6A extends horizontally from the front end of the guide rail 5 when it is pulled out to the front of the guide rail 5. The front frame 6A includes the linear guide 21 and the linear guide 21. Be vertically coupled to the front of the rear frame 6B via the linear actuator 24 comprising a hydraulic cylinder or a pneumatic cylinder is provided along the Id Rutotomoni, the head-side linear motion of the linear actuator 24 An accumulator 26 is connected via a switching valve 25 that locks and unlocks the actuator, and when the pedestal 7 and the traveling platform 6 are pulled out to a predetermined position, the front frame 6A of the traveling platform 6 supports the pedestal 7. When the front frame 6A is raised and lowered along the linear guide 21 by expansion and contraction of the linear actuator 24, the lifting force of the front frame 6A manually supported by the pressure stored in the accumulator 26 is supported. It is characterized by that.
[0008]
Further, in the pull-out lifting device constructed as described above, together with the cylinder portion 24A of the linear actuator is fixed in the upright to the front sides of the rear frame 6B, telescopic rod portion 24B is front frame 6A rear It is connected to.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, application examples of the present invention will be described in detail with reference to the drawings. First, FIG. 1 shows the state which installed this-application apparatus in the loading platform of the vehicle as a suitable usage type of this invention. In FIG. 1, 1 is a wagon type small fire engine (for example, a light vehicle), 2 is a cargo bed (high surface) formed at the rear thereof, 3 is a cargo (load) such as a fire pump mounted on the cargo bed, Reference numeral 4 denotes an elevating device according to the present application for loading and unloading a load. The elevating device 4 is guided by a guide rail 5 fixed to a loading platform 2 as a high place, and front and rear by the guide rail 5 (left and right direction in the figure). The pedestal 6 supported so as to be movable and the pedestal 7 supported movably back and forth by the traveling table 6 are configured as main elements. And according to this raising / lowering apparatus 4, by pulling out the traveling stand 6 and the base 7 to a predetermined position, they can be raised / lowered behind the loading platform 2, and the loading / unloading of the load 2 can be performed.
[0010]
2 is a plan view of the base forming the guide rail, FIG. 3 is a side view thereof, and FIG. 4 shows a cross section taken along line XX in FIG. As is apparent from these drawings, the base 8 is formed in a rectangular frame shape by connecting a pair of side plates 9 made of L-shaped steel or the like with a horizontal member 10, and the guide rails 5 are connected to the side plates 9 by carrier rollers. 11,... Are attached at predetermined intervals. The carrier rollers 11 are free rollers that are rotatably attached to the side plates 9 and are arranged in series along the side plates 9 so that the carriage 6 can move along the arrangement direction. A stopper 12 made of an angle plate or the like is attached to the central portion of the horizontal member 10, and the amount of movement of the traveling platform 6 along the guide rail 5 is limited by the stopper 12. Further, a lock plate 13 to be described later is attached to a portion inside the side plate 9.
[0011]
Next, the structure of the platform will be described with reference to FIGS. 5 to 9. This is composed of a metal frame that is almost the same size as the base 8, and the platform 6 is particularly rectangular as shown in FIG. The frame is divided into a front frame 6A and a rear frame 6B. Among these, a stopper 14 for restricting the amount of pulling out of the pedestal 7 is attached to the rear center of the front frame 6A, and a stopper 15 for restricting the rearward movement amount of the pedestal 7 is provided on both sides of the rear frame 6B. A lock plate 16 to be described later is attached to the center portion of the inner side surface of the rear frame 6B.
[0012]
Further, as shown in FIG. 6, U-shaped guide grooves 17 that engage with the carrier rollers 11 of the guide rail 5 are formed on both sides of the traveling base 6, and the pedestal 7 is formed above the guide grooves 17. Another guide groove 18 for guiding movement is formed. 6 shows a cross section of the rear frame 6B, the guide grooves 17 and 18 are also formed on both sides of the front frame 6A.
[0013]
On the other hand, brackets 19 and 20 made of L-shaped steel or the like are fixed upright on both sides of opposite end portions of the front frame 6A and the rear frame 6B. In particular, the bracket 20 on the rear frame 6B side is attached with a linear guide 21 made of, for example, a square rail along the longitudinal direction thereof, and the bracket 19 on the front frame 6A side is slidable on the linear guide 21. An engaging dovetail slider 22 is attached. As shown in FIG. 7, the bracket 20 on the rear frame 6B side has a top plate 23 projecting to the front frame 6A side, and one end of a cylinder portion 24A of a hydraulic cylinder 24 (linear actuator) is provided on the top plate 23. The telescopic rod portion 24B which is fixed and protrudes from below the cylinder portion 24A is connected to the bottom portion of the bracket 19 on the front frame 6A side. Thus, the rear portion of the front frame 6A is connected to the front portion of the rear frame 6B via the hydraulic cylinder 24 and the linear guide 21 so as to be movable up and down, and the front frame 6A is shown in FIG. It moves up and down along the linear guide 21.
[0014]
As shown in FIG. 9, the head side of the hydraulic cylinder 24 is connected to an accumulator 26 via a switching valve 25. Thereby, the front frame 6A gradually descends while extending the hydraulic cylinder 24 by its own weight, and when the front frame 6A is raised, the lifting force by the hand can be supported by the pressure stored in the accumulator 26.
[0015]
Next, the structure of the pedestal will be described with reference to FIGS. 10 to 11. The pedestal 7 has a rectangular frame shape as shown in FIG. 10, and its length is particularly shorter than the guide rail 5 and the traveling platform 6. Is set. A seat plate 27 for supporting a load is attached to the inside of the base 7 and a lock plate 28 (described later) is projected from the front end. On the other hand, as is apparent from FIG. 11, side plates 29 having an L-shaped cross section are attached to the both sides of the pedestal 7 over the entire length thereof, and traveling wheels 30 are attached to the side plates 29 at predetermined intervals. It is mounted so that it can rotate freely.
[0016]
Here, FIGS. 12 and 13 show a state in which the guide rail 5, the traveling platform 6, and the pedestal 7 configured as described above are combined. As is apparent from FIG. 12, the traveling wheel 30 provided on the pedestal 7 is engaged with the guide groove 18 formed on the traveling base 6, and the guide groove 17 formed on the lower stage thereof has a carrier for the guide rail 5 as described above. The roller 11 is engaged. Accordingly, the traveling platform 6 and the pedestal 7 can be moved in the direction perpendicular to the plane of the drawing in FIG. 12, but the pedestal 7 is moved forward and backward by stoppers 14 and 15 attached to the traveling platform 6 as apparent in FIG. The amount of movement is limited, and the traveling amount of the traveling platform 6 is limited between the guide rails 5 by the stopper 12 fixed to the bottom of the base 8.
[0017]
In particular, when the pedestal 7 is pulled out to a predetermined position (the rear end is positioned away from the front end of the rear frame 6B), that is, when the pedestal 7 is advanced forward until the rear end contacts the stopper 14, the pedestal 7 is In a state where the rear portion is supported by the front frame 6A of the carriage 6, about half of the front portion projects horizontally from the front end of the front frame 6A. The traveling platform 6 can be moved back and forth by the length of the rear frame 6B. That is, the rear frame 6B is movable from the rear to the front of the guide rail 5 until the rear end of the rear frame 6B contacts the stopper 12, and when the rear frame 6B is pulled out to the front of the guide rail 5, the front frame 6A is moved to the guide rail. 5 is completely extended from the front end of the frame 5 and is supported horizontally by the rear frame 6B remaining on the guide rail 5 in this state.
[0018]
When the rear frame 6B is pulled out to the front of the guide rail 5, the lock pin 31 is inserted into the lock plate 13 attached to the guide rail 5 and the lock plate 16 attached to the rear frame 6B. Thus, the rear frame 6B can be fixed. When the loading / unloading operation is completed, the traveling platform 6 and the pedestal 7 can be stacked and stored on the guide rail as shown in FIG. 13, and the lock plate attached to the pedestal 7 is stored at this time. 28 and the lock plate 13 attached to the guide rail 5 are opposed to each other, and a lock pin 31 is inserted into both the lock plates 13 and 28 so that the base 7 can be fixed to the guide rail 5. Therefore, the loaded luggage is not rattled by the vibration of the vehicle, and the luggage can be transported while being loaded on the vehicle.
[0019]
Next, the operation of the present lifting / lowering apparatus configured as described above will be described. FIG. 14 is an explanatory view showing the operation of each part in order, (A) is an initial state, (B) is a state where the traveling base 6 is pulled out, (C) is a state where the base 7 is pulled out, (D) is a state where A state in which the base 7 is lowered while being supported by the front frame 6A of the traveling base 6 is shown.
[0020]
First, as shown in FIG. 14A, the traveling platform 6 and the pedestal 7 are stored in a stacked state on the guide rail 5 when not in use. In this state, in order to unload a load placed on the pedestal 7 from a high place such as a loading platform of a vehicle in which the present apparatus is installed, the traveling platform 6 and the pedestal 7 are pulled out to a predetermined position as shown in (B) and (C). is there. Any of the traveling platform 6 and the pedestal 7 may be pulled out first. However, as shown in (B), when the traveling platform 6 is first pulled out, the rear frame 6B located behind the traveling platform 6 moves forward from the rear of the guide rail 5. The front frame 6 </ b> A extends horizontally from the front end of the guide rail 5. At this time, the hydraulic cylinder 24 is locked by the switching valve 25 shown in FIG. 9. However, even if the hydraulic cylinder 24 is extended by releasing the lock, the pedestal 7 on which the load is loaded is not limited to the traveling platform. Since the rear side is engaged with the rear frame 6B and the front side is engaged with the front frame 6A, the front frame 6A maintains the horizontal state at the position where it is pulled out without being lowered.
[0021]
Therefore, as shown in (C), the pedestal 7 is pulled out from the traveling platform 6 to a predetermined position (a position where the rear end deviates from the front end of the rear frame 6B), and is moved to the front frame 6A side. As a result, the pedestal 7 is projected from the front frame 6A about half of the front side while the rear side is supported by the front frame 6A. At this time, when the lock of the hydraulic cylinder 24 is released, the telescopic rod portion 24B extends by receiving the weight of the front frame 6A, the base 7, and the load placed thereon. As a result, the front frame 6A descends along the linear guide 21 while supporting the pedestal 7 in a cantilever state as shown in (D). After the descent, the rear frame 6B is fixed to the guide rail 5 and the load is lowered from the pedestal 7 in this state. At this time, the pedestal 7 protrudes in a direction away from the load platform of the vehicle. Therefore, the work can be easily performed.
[0022]
On the other hand, when loading a load on the loading platform of the vehicle, the front frame 6A is lifted to the position of the rear frame 6B after the load is placed on the pedestal 7 in the state shown in (D). Since the lifting force by hand is supported by the pressure stored in the container, the burden on the operator is small and even a heavy load can be easily lifted. Thus, after the front frame 6A has been lifted up to the position of the rear frame 6B, the hydraulic cylinder 24 is locked again, and then the base 7 and the traveling base 6 are pushed in and superimposed on the guide rail 5, and finally the base 7 is guided. Fix to the rail 5.
[0023]
Although a preferred example of the present invention has been described above, the pull-out type lifting apparatus according to the present invention is not limited to the above configuration, and a round shaft, a spline shaft, or the like may be used as the linear guide 21. They may be fixed to the front frame 6A side. Further, as the slide 22 that engages with the linear guide 21, for example, a groove or a hole that engages with the linear guide 21 may be formed in the bracket 19 provided at the rear portion of the front frame 6A.
[0024]
On the other hand, in addition to the hydraulic cylinder 24, a pneumatic cylinder can be used as the direct acting actuator.
[0025]
The lifting device of the present application is mainly installed on the loading platform of the vehicle as in the above example, but its application is various. For example, it is installed on a shelf in a building and used for loading and unloading various types of luggage. You can also.
[0026]
【The invention's effect】
As is apparent from the above description, according to the present invention, the front portion of the pedestal and the front frame of the pedestal are made into a three-stage structure comprising a guide rail, a traveling pedestal divided into a front frame and a rear frame, and a pedestal. Since these parts are lifted up and down in a state of projecting forward, these members can be stacked to save space when not in use, and large luggage equivalent to the installation space of this device can be loaded on the base. Because it is possible, there is little dead space and the space can be used effectively.
[0027]
In particular, since the front portion of the pedestal on which the luggage is loaded projects from the traveling platform, the loading and unloading work of the luggage can be easily performed at a position away from the object such as the vehicle.
[0028]
In addition, the front frame is connected to the rear frame through a linear guide and a linear actuator so that the front frame can be moved up and down, and the front frame supports the pedestal and moves up and down along the linear guide by expansion and contraction of the linear actuator. from, Ru obtained perform the lifting operation smoothly and properly.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing a state in which a lifting device according to the present invention is installed on a loading platform of a vehicle. FIG. 2 is a plan view of a guide rail. FIG. 3 is a side view of the guide rail. X-ray sectional view [Fig. 5] Plan view of the traveling platform [Fig. 6] XX sectional view in Fig. 5 [Fig. 7] Side view of the traveling platform [Fig. 8] A state where the front frame of the traveling platform is lowered. FIG. 9 is a hydraulic circuit diagram for operating a hydraulic cylinder. FIG. 10 is a plan view of a pedestal. FIG. 11 is a cross-sectional view taken along line XX in FIG. FIG. 13 is a longitudinal sectional view showing a lifting device according to the present invention. FIG. 14 is an explanatory diagram showing the operation state of the lifting device according to the present invention in order. FIG. 15 is a schematic diagram showing a conventional lifting device. [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fire engine 2 Cargo load 3 Cargo 4 Lifting device 5 Guide rail 6 Traveling stand 6A Front frame 6B Rear frame 7 Base 11 Carrier roller 21 Linear guide 22 Slider 24 Hydraulic cylinder (linear actuator)
24A Cylinder part 24B Telescopic rod part 30 Traveling wheel

Claims (2)

A guide rail 5 fixed to a high surface such as a loading platform of a vehicle, a traveling platform 6 supported by the guide rail so as to be movable back and forth, and a pedestal 7 supported by the traveling platform so as to be movable back and forth. A lifting device comprising:
The pedestal 7 can be pulled out from a position where its front part engages with a part of the traveling base 6 to a position where it protrudes from the traveling base 6 by a predetermined length,
The traveling table 6 supports a rear frame 6B that is drawn forward from the rear of the guide rail 5 and a rear portion of the base 7 that is drawn to a predetermined position, and pulls the rear frame 6B to the front of the guide rail 5. And a front frame 6A that projects horizontally from the front end of the guide rail.
The front frame 6A is connected to the front portion of the rear frame 6B through a linear guide 21 and a linear motion actuator 24 including a hydraulic cylinder or a pneumatic cylinder provided along the linear guide so as to be movable up and down .
An accumulator 26 is connected to the head side of the linear actuator 24 via a switching valve 25 that locks and unlocks the linear actuator.
When the pedestal 7 and the traveling platform 6 are pulled out to a predetermined position, the front frame 6A of the traveling platform 6 moves up and down along the linear guide 21 by the expansion and contraction of the linear actuator 24 while supporting the pedestal 7, and the front frame 6A is moved up and down. In the case of raising , the pull-up type lifting apparatus is characterized in that the lifting force of the front frame 6A manually supported by the pressure stored in the accumulator 26 is supported . With the cylinder portion 24A of the linear actuator is fixed in the upright to the front sides of the rear frame 6B, telescopic rod portion 24B pull-out lifting device according to claim 1, wherein connected to a rear portion of the front frame 6A.

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