JPH02278B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lifting device used for lifting workers or materials and lowering unnecessary parts for work at high places, and in particular, relates to a lifting device that is used for lifting workers or materials and lowering unnecessary parts for work at high places. The present invention relates to an elevating device that can raise or lower an elevating platform with such a configuration.

[Conventional technology]

BACKGROUND ART Lifting devices have been used for aerial construction such as painting, construction, electrical equipment, signage, etc. at high places, in which a lifting platform loaded with workers and materials is moved up and down using hydraulic pressure or the like.

Many of these conventionally used elevating devices have a structure in which an elevating platform is supported so as to be movable up and down by a pantograph type link mechanism, and the link mechanism is expanded and contracted by a hydraulic cylinder. This pantograph-type link mechanism lifting device has a large number of pin-connected parts, and when the lifting platform is at a high position, the play of each pin-connecting part accumulates, increasing the allowable amount of horizontal movement of the lifting platform. The lifting platform sometimes sways due to vibrations, etc., making the work dangerous and causing a sense of anxiety to the workers.

[Problem that the invention seeks to solve]

For this reason, there is a need for an elevating device that makes the elevating platform strong and moves it up and down, and instead of using the conventional pantograph link mechanism, an arm that can retract and retract is inserted into the open end of each of a pair of X-shaped booms. Lifting devices have also been proposed in which the tip of each arm is connected to the vehicle body and the lifting platform to reduce the shaking of the platform (for example,
No. 41289, patent application No. 99947 of 1982, etc.). These newly designed lifting devices can firmly hold the platform and prevent the platform from swinging due to wind or vibration, but they have the disadvantage of being complex and difficult to manufacture. It was hot.

In view of the above-mentioned disadvantages, the present invention connects a pair of booms at one end in a dogleg shape, inserts into each boom an arm that can slide in the length direction, connects one arm to the vehicle body, and connects the other arm to the vehicle body. The arm is connected to the lifting platform, and the boom and the arm form a Σ-shape, thereby providing a lifting device that has a simple structure and firmly holds the lifting platform and moves it up and down.

[Means for solving problems]

In the present invention, a movable vehicle body, a lifting platform that moves up and down above the vehicle body, and one end of each of a pair of elongated booms are rotatably connected, and an arm is slidably connected to the other end of each boom. An elevating device that has a lifting mechanism inserted through it, and has a Σ-shaped shape when viewed from the side by connecting the tip of one arm to the front of the upper surface of the vehicle body and the tip of the other arm to the front of the lower surface of the elevating platform. A driving hydraulic cylinder is provided between the pair of booms to open and close both booms in a fan shape, and a telescoping hydraulic cylinder is provided inside each boom to extend and retract the arm from the boom.
A hydraulic cylinder for both drives and a hydraulic cylinder for telescoping are connected in parallel to the hydraulic supply mechanism that is the drive source of this lifting device, and a link lever is interposed between the tip of one boom and the rear of the top surface of the vehicle body, and the other is A link lever is interposed between the tip of the boom and the rear of the lower surface of the lifting platform, and a connecting shaft that rotates with the other boom is pivotally supported at the connection point of both booms, and one boom is connected to the lower link lever. A connecting shaft is pivotally supported at the point, a sprocket wheel is fixed to each connecting shaft, and a sprocket wheel is fixed to the top of the car body with its center aligned with the rotation axis of the lower link lever. A chain is interposed between the sprocket wheels to synchronize the rotation angle of the connecting shaft, and by operating the drive hydraulic cylinder and the telescopic hydraulic cylinder simultaneously, it is possible to move the platform up and down while keeping it horizontal. The present invention provides a unique lifting device.

[Effect]

In the present invention, when trying to raise the lifting platform,
The drive mechanism and the telescoping mechanism operate simultaneously to expand the boom into a fan shape and extend each arm from the tip of the boom to operate in a Σ shape. In addition, since the interlocking mechanism synchronizes the opening angle of the boom and the opening angle of the boom and link lever, the amount of extension of the arm extending from the boom and the amount of opening of both booms are synchronized, and the angle of one boom with respect to the vehicle body is adjusted. The angle between the boom and the lifting platform is always the same, and the lifting platform can be raised while being maintained horizontally.

〔Example〕

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

Rotatable wheels 2 and rear wheels 3 are pivotally supported on both sides of the vehicle body 1, and rotatable wheels 2 and rear wheels 3 allow the vehicle body 1 to move freely. Each of these is equipped with an outrigger 4 that fixes the vehicle body 1 at a specific location.

Reference numeral 5 in the figure indicates a lifting mechanism, and this lifting mechanism 5 is composed of booms 6, 7 and arms 8, 9, each of which has an elongated shape with a hollow rectangular cross section. One ends of both booms 6 and 7 are connected by a pin 10 as a connecting shaft so that they can rotate in a fan shape. The other end of each boom 6, 7 is open, and an arm 8, 9 is inserted into each boom 6, 7 so that it can slide in the length direction of the boom 6, 7 from the other end opening. . A drive mechanism 11 consisting of hydraulic cylinders, chains, etc. is interposed between each of the pair of booms 6 and 7 on the left and right sides, and arms 8 and 9 are extendable and retractable from the booms 7 and 8 within the booms 7 and 8. Hydraulic cylinder 1 as a telescoping mechanism to
2 and 13 are stored respectively.

At a position close to the front wheel 2 at the center of the upper surface of the vehicle body 1, a pair of shaft support pieces 14 are erected at intervals on the left and right.
One end is rotatably connected by a pin 15. Even on the upper surface of the vehicle body 1, shaft support pieces 16 and 17 are erected on the left and right sides of the position close to the rear wheel 3, respectively.
One end of link levers 18 and 19 are connected to 17 by pins 20 and 21, respectively, and the other end of each link lever 18 and 19 is connected to the lower boom 6 by a shaft 22 serving as a connection shaft. It is connected to the tip.

Further, reference numeral 24 is a lifting platform for placing workers, materials, etc., and a pair of shaft support pieces 25 are mounted downwardly at intervals at a position offset to one side at the center of the lower surface of this lifting platform 24. One end of an arm 9 is rotatably connected to this shaft support piece 25 by a pin 26. Further, shaft support pieces 27 and 28 are erected on the left and right sides of the lower surface of the lifting table 24 at positions opposite to the shaft support pieces 25, and these shaft support pieces 27 and 28 are provided with pins 3 and 3, respectively.
One end of the link levers 29, 30 are connected by 1, 32, and the other end of each link lever 29, 30 is connected to the tip of the upper boom 7 by a shaft 33, respectively.

To explain the drive mechanism 11 in more detail,
As shown in FIGS. 5 and 6, this drive mechanism 11 is composed of a hydraulic cylinder 35 and a chain 36 as a belt-shaped body, and this drive mechanism 11 is comprised of one set on the left and right sides of the booms 6 and 7, respectively. They are installed one by one. In FIGS. 5 and 6, one set of drive mechanisms 11 is drawn, and the other set of drive mechanisms 11 on the back of the booms 6 and 7 are omitted, but the configurations are the same. be. A pair of support rods 37, 38 are protruded from each boom 6, 7 at a position away from the pin 10 on the sides of the booms 6, 7, and a flat plate is provided near the middle of the support rods 37, 38. A pair of shaped bridging pieces 39, 40 are fixed to each other at a distance, and chain hooks 41, 42 are fixed to the inside of the bridging pieces 39, 40, respectively. Chain hooks 41 and 42 above and below this
Both ends of the chains 36 are connected between them, and the chains 36 are arranged in a slightly C-shape with intervals left and right. Each chain 3
A turnbuckle 43 for adjusting the interval is provided in the middle of 6, and a stopper 44 for regulating the position is fixed to the lower part of the turnbuckle 43.

Next, support shafts 45 and 46 are rotatably supported at both ends of the hydraulic cylinder 35, respectively, and sprocket wheels 47 and 48 are fixed to both ends of each support shaft 45 and 46, respectively. This hydraulic cylinder 35 is vertically raised and held, and the aforementioned chain 36 is engaged with each sprocket wheel 47, 48, respectively.

Next, FIGS. 7 and 8 show the synchronization mechanism of the lifting mechanism 5. A mounting bracket 50 is fixed to the upper surface of the vehicle body 1, located on the same axis as the shaft support piece 16, and a sprocket wheel 51 is fixed to the mounting bracket 50. The aforementioned shaft 22 is rotatably supported by a bearing 57 attached to the tip of the boom 6, and the aforementioned link lever 18 is rotatably connected to this shaft 22.
A sprocket wheel 53 is fixed between the sprocket wheels 7 and the link lever 18, and a chain 52 is wound around the sprocket wheels 51 and 53. Further, a sprocket wheel 54 is fixed to the end of the shaft 22, and the above-mentioned pin 1
A sprocket wheel 55 is also fixed to the end of the sprocket, and a chain 56 is wound between the sprocket wheels 54 and 55. This pin 10
is rotatably inserted through a connecting piece 58 protruding from the end of the boom 6 at intervals, and the pin 10
The rotating direction of the connecting pieces 59, which are protruded from the end of the boom 7 at intervals, is fixed by a key 60.

Next, FIG. 9 shows the hydraulic system in this embodiment.

A pump 62 is connected to the oil tank 61 filled with hydraulic oil, and the output of the pump 62 is connected to a manually operated switching valve 63, which is connected to the switching valve 63 via a relief valve 64. A hydraulic cylinder 12 is connected to the relief valve 64, and a check valve 65 is connected in parallel to the relief valve 64. Further, a relief valve 66 is interposed between the hydraulic cylinders 12 and 13, and a check valve 67 is connected in parallel to the relief valve 66. The hydraulic cylinder 13 is communicated with an oil tank 61 via the switching valve 63. Further, a hydraulic cylinder 35 is connected to the switching valve 63 via a relief valve 68.
A check valve 69 is connected in parallel to the relief valve 68, and a switching valve 63 is connected to the other through hole of the hydraulic cylinder 35.

Next, the operation of this embodiment will be explained.

When an engine (not shown) is operated to drive the pump 62, the pump 62 sucks up the hydraulic oil in the oil tank 61 and supplies pressure oil to the switching valve 63. At this time, when the lever is manually pushed upward, the switching valve 63 is connected in the forward direction, and the pressure oil is transferred to the check valve 65.
enters the hydraulic cylinder 12, and the hydraulic cylinder 12
The hydraulic oil discharged from the hydraulic cylinder passes through the check valve 67 and enters the hydraulic cylinder 13. The pressure oil discharged from the hydraulic cylinder returns to the oil tank 61 via the switching valve 63.
At the same time, pressure oil is supplied to the check valve 69 from the switching valve 63.
The pressure oil that is supplied to the hydraulic cylinder 35 through the hydraulic cylinder 35 and discharged from the hydraulic cylinder 35 is returned to the oil tank 61 through the switching valve 63.

By supplying this pressure oil, each hydraulic cylinder 1
Piston rods 2, 13, and 35 extend. Therefore, the arm 8 is pushed out from the boom 6 by the hydraulic cylinder 12, and the arm 9 is pushed out from the boom 7 by the hydraulic cylinder 13. Since both hydraulic cylinders 12 and 13 are connected in series, both arms 8 , 9 are all the same. When this arm 8 is pushed out from the boom 6, a triangular shape is formed by the vehicle body 1, the arm 8, and the link lever 18, and one end of the boom 6 (pin 10
side) is lifted upward and boom 6, arm 8
is inclined with respect to the vehicle body 1. Also, when the arm 9 is pushed out from the boom 7, the lifting platform 2
4, the arm 9, and the link lever 29 form a triangular shape, and one end of the lifting platform 24 is lifted upward. At this time, the hydraulic cylinders 12,1
3 are the same, so the first angle between the vehicle body 1 and the arm 8 formed around the pin 15 and the arm 9 formed around the pin 26 are the same.
and the second angle of the lifting platform 24 are always the same.

Further, when the hydraulic cylinder 35 is operated, the hydraulic cylinder 35 is expanded, and the distance between the upper and lower support shafts 45 and 46 becomes longer, and the chain 36 is pulled up and down by the sprocket wheels 47 and 48. . Both ends of the chain 36 are fixed to chain hooks 41 and 42, respectively, so the stretching force by the hydraulic cylinder 35 is applied to the sprocket wheel 4.
7, 48 to the chain 36, it acts to separate the pair of chain hooks 41, 42, and as a result, the booms 6, 7 are rotated in a fan shape around the pin 10. During the opening movement of the booms 6 and 7, the distance between the chain hooks 41 and 42 moves significantly compared to the amount of extension of the hydraulic cylinder 35, and changes to about twice the amount of extension of the hydraulic cylinder 35. This is because the extension force of the hydraulic cylinder 35 is transmitted to each boom 6, 7 by the chain 36.

By the operation of these hydraulic cylinders 12, 13, 35, the arms 8, 9 are extended from the booms 6, 7, and the booms 6, 7 are opened around the pin 10, and the vehicle body 1, the boom 6, 7. The arms 8, 9 and the lifting platform 24 operate in a Σ-shape when viewed from the side, and the lifting platform 24 rises. At this time, since the sprocket wheel 51 is fixed to the vehicle body 1, the link lever 1 is moved as the arm 8 is extended.
8 opens, the shaft 22 opens centering on the sprocket wheel 51, and the chain 51 follows so as to be wound around the sprocket wheel 51, and the sprocket wheel 53 and the shaft 2
Open 2. This rotation of the shaft 22 is transmitted to the pin 10 by the sprocket wheel 54, chain 56, and sprocket wheel 55.
Connecting piece 58 by rotation of pin 10 and key 60;
This will be communicated to Boom 7.

From this, the opening angle of the link lever 18 is transmitted to the pin 10, and the angle at which the link lever 18 opens around the pin 20 and the angle at which the boom 7 moves around the pin 10 are transmitted to the pin 10.
The angle at which the hydraulic cylinders 12 and 13 and the hydraulic cylinder 35 open will always be proportional.
The amount of extension is regulated by the connection of the chains 52 and 56, and the amount of extension is always regulated so that the rotation angles of the link lever 18 and the boom 7 are proportional. Therefore, even if the hydraulic cylinders 12, 13 and the hydraulic cylinder 35 are operated by separate hydraulic systems, the amount of extension thereof is controlled. As mentioned above, the hydraulic cylinders 12 and 13 are connected in series and extend the same amount, so the amount of rotation of arm 8 and the amount of rotation of arm 9 are the same, and the opening angle of boom 6 and boom 7 is the same as that of the arms. This is twice the rotation angle of 8, and the lifting platform 24 is always raised horizontally.

Further, when lowering the elevator platform 24, the flow of pressure oil is reversed by manually performing a lowering operation and reversing the control valve 63. Therefore, the pressure oil discharged from the pump 62 is transferred to the hydraulic cylinder 13.
In order to simultaneously conduct the relief valves 64 and 66, the hydraulic cylinders 12 and 13 are retracted by the same length, and the arms 8 and 9 are slid to be housed in the booms 6 and 7, respectively. As a result, the angle between the vehicle body 1 and the arm 8 and the angle between the lifting platform 24 and the arm 9 are closed.

At the same time, pressure oil is supplied to the hydraulic cylinder 35, and the relief valve 68 is opened, so that the pressure oil returns to the oil tank 61, the hydraulic cylinder 35 contracts, and the opening angle of the booms 6, 7 decreases. The reduction amounts of the hydraulic cylinders 12, 13 and 35 are made proportional by the chains 52, 56 and the sprocket wheels 51, 53, 54, 55, so the pins 15, 26 of the arms 8, 9 are the center. The rotation angle at which the booms 6 and 7 rotate around the pin 10 and the rotation angle at which the booms 6 and 7 rotate around the pin 10 always operate in proportion to each other. do.

[Effects of the Invention] Since the present invention is configured as described above, it has a simple configuration, but the lifting platform can be moved up and down horizontally, and since the number of booms used is small, swinging is less likely to occur. be. Furthermore, since the arms extend and contract from the boom and the booms also open and close, the platform can be raised to a high position, and the arms can be stored compactly when not in use.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view showing an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a side view showing the lifting platform of the above in a raised state, and Fig. 4 is a side view of the same as the above. A front view, FIG. 5 is a partially sectional side view showing the drive mechanism, FIG. 6 is a perspective view of the same as above, FIG. 7 is an enlarged partially sectional view showing the synchronizing mechanism, and FIG. 8 is an interlocking state of the same as above. FIG. 9 is a piping diagram showing the hydraulic system. 1... Vehicle body, 6, 7... Boom, 8, 9... Arm,
10... Pin as a connecting shaft, 11... Drive mechanism, 1
2, 13... Hydraulic cylinder as telescopic operation mechanism, 18, 19, 29, 30... Link lever, 2
2...Shaft as a connecting shaft, 24... Lifting platform, 5
6...Chain as an interlocking mechanism.

Claims (1)

[Claims] 1 A lifting system in which a movable vehicle body, a lifting platform that moves up and down above the vehicle body, and one end of a pair of elongated booms are rotatably connected, and an arm is slidably inserted from the other end of each boom. In an elevating device having a mechanism, the tip of one arm is connected to the front of the upper surface of the vehicle body, and the tip of the other arm is connected to the front of the lower surface of the elevating platform, thereby forming a Σ-shape when viewed from the side. A driving hydraulic cylinder is installed between the booms to open and close both booms in a fan-shaped manner, and an extending hydraulic cylinder is installed inside each boom to extend and retract the arm from the boom. The mechanism has both drive hydraulic cylinders and telescopic hydraulic cylinders connected in parallel, with a link lever interposed between the tip of one boom and the rear of the top of the vehicle body, and the tip of the other boom and the rear of the bottom of the lift platform. A link lever is interposed between them, a connecting shaft that rotates together with the other boom is pivotally supported at the connecting point of both booms, a connecting shaft is pivotally supported at the connecting point of one boom and the lower link lever, A sprocket wheel is fixed to each connecting shaft, and the sprocket wheel is fixed to the top of the car body with its center aligned with the rotational axis of the lower link lever. An elevating device characterized by interposing a chain for synchronizing angles and simultaneously operating a driving hydraulic cylinder and a telescoping hydraulic cylinder to move an elevating platform up and down while maintaining it horizontally.