JPS6036299A - Lifting gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting device used for lifting work loads or materials and lowering unnecessary parts for work at high places, and in particular, a lifting platform with a simple configuration. This invention relates to an elevating device that can raise or lower.

BACKGROUND ART For aerial construction work such as painting, construction, electrical installations, and signboards at high places, lifting devices have been used that move up and down lift platforms loaded with workers and materials using hydraulic pressure or the like. Most of the conventionally used elevating devices have a structure in which the elevating platform is supported in a vertically movable manner by a pantograph type link mechanism, and the link mechanism is expanded and contracted by a hydraulic cylinder. This nokuntagraph type, link mechanism lifting device has many pin connecting parts, and when the lifting platform is at a high position, the play of each bottle connecting part accumulates, allowing the lifting platform to move horizontally. As a result, the lifting platform often sways due to wind, vibration, etc., making the work dangerous and causing a sense of anxiety to the workers. For this reason, there is a need for an elevating device that firmly holds the elevating platform and moves it up and down, and instead of using a nokuntagraph link mechanism, an arm that can retract and retract is inserted into the opening end of each of a pair of X-shaped frames. Therefore, an elevating device has been proposed in which the tip of each arm is connected to a heavy body and an elevating platform to reduce the shaking of the elevating platform.
No. 289, Patent Application No. 99947 of 1980, etc.).

These newly proposed lifting devices can firmly hold the lifting platform and prevent the platform from swinging due to wind or vibration, but they have the disadvantage that they have a complicated structure and are difficult to manufacture. Ta.

In view of the above-mentioned drawbacks, the present invention has been proposed by connecting a pair of arms in a dogleg shape at one end, connecting one arm to a heavy body and connecting the other arm to a lifting platform, forming a dogleg shape. To provide an elevating device that firmly holds an elevating platform and moves it up and down.

An embodiment of the present invention will be described below with reference to the drawings.

Rotatable front TFI 12 and rear wheels 3 are located on both sides of the vehicle body 1.
6D, the front wheels 2 and rear wheels 3 allow the weight of the vehicle to move freely, and outriggers 4 can be attached to each of the four corners of the vehicle body 1 to fix the vehicle body 1 in a specific location. be. A pair of shaft support pieces 5 are erected at a position close to the front wheels 2 on the upper surface of the vehicle body L at intervals on the left and right. It is connected so that it can move freely. and,
Another arm 8 having the same length as the arm 6 and the grinding wheel is rotatably connected by a shaft 9 at the other end of the arm 6 and one end of the arm 8, and the two arms 6 and 8 are in a dogleg shape. Can be opened and closed. 10 is a lifting platform on which workers and materials are placed, and on the bottom surface of this lifting platform 10, at a position deviated to one side, a pair of shaft support pieces 1 are erected downward at intervals. The other end of the arm 8 is rotatably connected to this shaft support piece 11 by a shaft 12.

Near the center of the upper surface of the body weight, a pair of connecting fittings 13 are fixed at intervals on the left and right sides (h'), and between the connecting fittings 13 and both sides of the intermediate portion of the arm 6, there are hydraulic cylinders 14, respectively. It is an intervention.

A drive mechanism 15, which will be described in detail later, is provided at a position centered between the pair of arms 6.8 and close to the shaft 9. Further, on the lower surface of the lifting platform 10 and at a position opposite to the shaft support piece 11, connecting fittings 16 are fixed at intervals on the left and right, and between this connecting fitting 16 and the slightly center of the arm 8 In this case, a hydraulic cylinder is involved.

The drive mechanism 15 will be explained in more detail. As shown in FIGS. 5 and 6, the drive mechanism 15 is composed of one hydraulic cylinder 18 and a chain 19 as a band-like body. Each of the arms 6.8 is formed of a pair of parallel square pipes.
Reference numeral 8 is a bridge between the arms 6 and 6, and a set of two support rods 20 and 21 between the arms 8 and 8, spaced apart from the shaft 9 by the same distance. A pair of flat plate-shaped bridging pieces 22.23 are fixed at intervals near the middle of this support rod 20.21, and chain hooks 24.25 are fixed to the inner surfaces of the bridging pieces 22.23, respectively. It is. Both ends of the chains 190 are connected between the upper and lower chain hooks 24 and 25, respectively, and each chain 19 is formed in a slightly C-shape with intervals left and right. A turnbuckle 26 for adjusting the spacing is provided in the middle of each chain 19, and a stopper 27 for regulating the position is fixed to the lower part of the turnbuckle 26.

Next, support shafts 2 are provided at both ends of the hydraulic cylinder IB, respectively.
8.29 is rotatably supported, and each support shaft 28.
Nugroket wheels 30 and 31 are fixed to both ends of 29. This hydraulic cylinder 18 is erected vertically, and the aforementioned chains 19 are engaged with each sprocket wheel 30, 31, respectively.

Next, FIG. 7 shows the hydraulic system on the main side. A pump 34 is connected to the oil tank 33 filled with hydraulic oil, and the output of the pump 34 (operated by the electric signal CIri) 1 and the switching valve 35°: (6 are connected to the switching valve 35° and 6, respectively. ' 35 has a relief valve 37
A check valve 3B is connected in parallel to the relief valve 37, which the hydraulic cylinder 17 is connected to and straddles through. Further, a relief valve 37 is interposed between the ports 1'' of the hydraulic cylinders 17 and 14, and a check valve 40 is connected in parallel to the relief valve 39. The hydraulic cylinder 14 is communicated with an oil tank 33 via the switching valves 3 and 5. A hydraulic cylinder 18 is connected to the switching valve 36 via a relief valve 41, a check valve 42 is connected in parallel to the relief valve 41, and a switching valve is connected to the other through hole of the hydraulic cylinder 18. 36 is connected. And the activation switch 4
3 is connected to a control circuit 44 containing a microcomputer, etc., and the output of the control circuit 44 is connected to switching valves 35 and 36, respectively.

Next, the operation of this embodiment will be explained.

When the engine (not shown) is operated and the pump 34 is driven, the pumps 341-t suck up the hydraulic oil in the oil tank 33 and supply pressure oil to the switching valves 35 and 36, respectively. At this time, when the up button of the operation switch 43 is turned on, the switching valves 35 and 36 are connected normally, pressure oil enters the hydraulic cylinder 17 through the check valve 38, and the hydraulic oil discharged from the hydraulic cylinder 17 is The pressure oil passes through the check valve 40 and enters the hydraulic cylinder 14, and the pressure oil discharged from the hydraulic cylinder 14 returns to the oil tank 33 via the switching valve 35. In addition, pressure oil is supplied to the hydraulic cylinder 1 via the switching valve 36 and the check valve 42.
4 and discharged from the hydraulic cylinder 18 is returned to the υ oil tank 33 through the switching valve 36. By supplying this pressure oil, each hydraulic cylinder 14, 17, 18 starts operating, and each hydraulic cylinder 17, 14, 17, 18
The piston rond of is extended.

Therefore, first, the arm 6 rotates upward around the shaft 7, tilts from the vehicle body 1, and its tip rises, and at the same time, the arm 8 rotates around the shaft 12 by the hydraulic cylinder 17, and moves downward from the elevator platform 10. descend towards. Since these hydraulic cylinders 14 and 17 are connected in series, the operating amount of each hydraulic cylinder 14 and 17 is the same, and the arm 6
The angle of the vehicle body 1 and the angle of the arm 8 and the lifting platform 100 are equal.

Further, when the hydraulic cylinder 18 is activated, the hydraulic cylinder 18
is stretched, the distance between the upper and lower support shafts 28, 29 becomes longer, and the chain 19 is pulled up and down by the sprocket wheels 30 and 31. Since both ends of the chain 19 are fixed to the chain hooks 24.25, the stretching force by the hydraulic cylinder 18 is transmitted to the chain 19 via the sprocket wheels 30.31, and This acts to pull the distance apart, resulting in the arm 6.8 opening in a fan-like manner about the shaft 9. In this opening movement of the arm 6.8, the chain engagement 2 is compared to the amount of extension of the hydraulic cylinder 18.
The interval of 4.25 moves significantly and varies by approximately twice the amount of extension of the hydraulic cylinder 18.

This is because the extension force of the hydraulic cylinder 18 is transmitted to each arm 6.8 by the chain 19.

By the operation of the hydraulic cylinders 14, 17 and 18, the vehicle body 1, arm 6.8, and lifting platform 10 rotate about the shafts 7, 9, 12, respectively, as seen from the side. It operates in an ε-shape, and the elevating platform 10 rises. At this time, by adjusting the operating amounts of the hydraulic cylinders 14 and 17 and the hydraulic cylinder cylinder 8 by the control circuit 44, the angle between the arms 6 and 8 is always twice the angle between the vehicle body 1 and the arm 6. If set, the unloading platform 10 will always be maintained horizontally with respect to the vehicle body 1.

In addition, when lowering the elevator platform 10, an operation switch 43 is provided.
Pressing the down button causes the control valves 35,36 to actuate and reverse the flow of pressure oil. Therefore, the pressure oil discharged from the pump 34 is transmitted to the hydraulic cylinder 14, and at the same time, the relief valve 37.39 is made conductive, so that each hydraulic cylinder 14.17 is reduced to the same length, and the arm 6 and the vehicle body 1 are reduced in length. ,
The angles of the arm 8 and the lifting platform 100 are made smaller. At the same time, pressure oil is also supplied to the hydraulic cylinder 18, and the relief valve 4
1 is opened, the pressure oil returns to the oil tank 33,
The hydraulic cylinder 18 contracts and the opening angle of the arms 6 and 8 decreases. Therefore, contrary to the above, the elevator platform 10 approaches the vehicle body and descends while remaining horizontal.

Since the present invention is constructed as described above, although it has a simple construction, it is possible to horizontally move the lifting platform up and down, and since the number of arms used is small, swinging is less likely to occur.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view showing one embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a front view of the same, and Fig. 4 is a state in which the elevating platform of the above is raised. 5 is a partially sectional side view showing the drive mechanism; FIG. 6 is a perspective view of the same as above;
Figure 7' is a piping diagram showing the hydraulic system. DESCRIPTION OF SYMBOLS 1... Vehicle body, 6.8... Arm, lO... Lifting platform, 14.17... Hydraulic cylinder, 15... Drive mechanism. Patent Applicant Hikoma Seisakusho Co., Ltd. Patent Attorney Hisashi Hibi Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] One end of each of a pair of elongated arms is rotatably connected, the other end of one arm is rotatably connected to a movable vehicle body, and the other end of the other arm is rotatably connected to a lifting platform. A drive mechanism is provided between both arms to open and close the arm in a fan shape, and an actuation mechanism is provided between one arm and the vehicle body and between the other arm and the elevator platform. An elevating device characterized in that the elevating platform is held in a substantially horizontal position and moved up and down by synchronized action of the elevating platform.