JPS61229799A - Elevator appaliance - 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] [Field of Industrial Application] The present invention relates to a lifting device capable of lifting personnel and materials to a high place by moving a lifting platform upward and downward above a vehicle body, and in particular, relates to a lifting device that can lift personnel and materials to a high place by moving a lifting platform upward and downward above a vehicle body. This invention relates to an elevating device that has a simple structure for elevating and lowering, has the same function as the conventional one, and can smoothly remove water from an elevating platform.

[Conventional technology]

Lifting devices that raise and lower platforms are often used for assembly, painting, and repairs at high places such as highways and building construction, and workers and materials are placed on these platforms and lifted or lowered for work. . In this conventional lifting device, a pair of arms are pivoted at the center to form one set, and a pantograph-like extension/retraction mechanism is used in which multiple sets of arms are connected in the vertical direction (so-called scissor type). In order to increase the maximum lifting height of the lifting device, it was necessary to increase the length of each arm or increase the number of connecting arms. For this reason, when designing a lifting device that can increase the height of the lift, multiple sets of pantographs must be used, and the height of the lifting device with the telescoping mechanism folded increases, making it difficult for workers to reach the platform. The work of getting on and off the vehicle and loading and unloading materials was cumbersome. For this reason, a lifting device has been devised in which multiple booms are telescopically inserted into the inside of the arm so that one arm can extend in its length direction.
Example 9'''・Special Application No. 134487 of 1982・Special Application No. 134487 of 1980
No. 6, No. 191065, etc.), in this newly proposed lifting mechanism, two sets of booms are combined in an X shape so that they can rotate freely at the center, and two sets of boom bodies are arranged in parallel.
The upper and lower arms of the book connected the vehicle body and the lifting platform. For this reason, the number of booms required to be used increases, the number of component parts becomes extremely large, manufacturing and assembly becomes complicated, and the cost becomes high. In addition, there are extremely many sliding parts between the boom and the arm, and since sliding parts such as MC nylon are normally attached to these sliding points, the number of parts that need to be replaced regularly increases, making inspection and maintenance difficult. This was expensive and the work was troublesome.

For this reason, a lifting device has been proposed in which the boom body is made into a single boom body that expands and contracts to form a two-figure shape when viewed from the side (Japanese Patent Application No. 95797 of 1981, etc.). Since the equipment uses a boom body that expands and contracts in multiple stages, there is a difference in level between each boom, and it is difficult to secure a pivot point to support the platform horizontally. It has been difficult to intervene with maintenance mechanisms.

[Problem that the invention seeks to solve]

When trying to lift a lifting platform with a single boom, each boom slides individually, increasing the distance between each boom, and moving the mechanism that supports the lifting platform between the booms other than the top boom and the lifting platform. Even if you try to intervene, the interval becomes unspecified and it is not possible to maintain the platform horizontally.
Even if we try to attach a mechanism to the top boom to maintain the level of the platform, the part where it can be attached to the top boom is extremely limited, and unreasonable force will be applied to it, making it impossible to manufacture. It's close.

[Means to solve the problem]

It consists of a movable vehicle body, a flat elevating platform placed above the vehicle body, and a telescopic boom body placed between the vehicle body and the elevating platform, which is extendable and retractable by inserting multiple booms in its length direction. In a lifting device that can raise and lower a lifting platform in the vertical direction by extending and contracting each boom of a telescoping boom body, a cover body is provided on the topmost boom of the telescoping boom body so as to cover this boom. provided, the cover body rolls on the top surface of each boom of the telescopic boom body, and
An elevating device characterized by being provided with a step elimination mechanism that can overcome steps between booms.

[Effect]

When the boom body is extended, each boom is pulled out and the platform is lifted upwards, but a level difference elimination mechanism is interposed between the cover body and the booms other than the top boom, and this level difference is removed. The release mechanism constantly slides over the steps in each boom range,
The cover body can support the stress applied by the step elimination mechanism. Since the horizontal maintenance mechanism is interposed between the cover body and the lifting platform, even if the cover body receives the load from the lifting platform, the step elimination mechanism slides while the boom body is fully extended and retracted to take the load. can be transmitted to the boom body.

〔Example〕

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

A front wheel 2 and a rear wheel 3 are pivotally supported on the front, rear, left and right sides of the vehicle body 1, so that the vehicle body 1 can move freely.
A power supply box 4 containing an engine, a hydraulic pump, etc. is attached to the lower part of the vehicle body 1. A pair of shaft support pieces 5 are fixed to one end of the upper surface of the vehicle body 1 at intervals, and the shaft support pieces 5
A hollow lower pool 6 with a rectangular cross section is inserted between them, and the shaft support piece i and the lower pool 6 are rotatably connected by a pin 7. A pair of pins 8 are fixed to the left and right sides of the upper surface of the vehicle body 1 at positions opposite to the shaft support piece 5, and between the pins 8 and the outside of the lower boom 6, a pair of pins 8 are fixed. A hydraulic cylinder 9 is interposed. The tip of the lower boom 6 has a rectangular opening, and an internal hollow poom 10 with a square cross section is slidably inserted into this opening. A hollow tip boom 11 is slidably inserted therein. A cover body 12 having a U-shaped cross section and opening downward is fixed to the tip of the tip boom 11. are spaced parallel to the outside of the lower boom 6, and a gap is formed between the tip pool 11 and the cover body 12 such that the lower boom 6 can be inserted therethrough. The lower boom 6 is set to have a length approximately equal to the length of the vehicle body 1, and the middle boom 10 and front boom 11 are also set to approximately the same length as the vehicle body 1. 10. A telescopic boom body 13 is formed by the tip boom 11. Reference numeral 16 denotes a flat lifting platform having almost the same floor area as the vehicle body 1. A pair of shaft supporting pieces 14 are fixed to one end of the lower surface of the lifting platform 16 at intervals. A cover body 12 is inserted into the shaft support piece 14 and the cover body 12 are rotatably connected by a pin 15. In addition, a pair of pins 17 are fixed to the lower surface of the lifting platform 16 on both sides opposite to the shaft support piece 14, and a hydraulic cylinder is connected between each pin 17 and both sides of the cover body 120. 18 is interposed therebetween, and a handrail 19 is installed around the upper surface of the lifting platform 16.

FIG. 5 shows the configuration of the above-mentioned telescopic boom body 13.
The lower boom 6, the middle boom 10, and the tip boom 11 are each inserted in a telescopic manner so that they can be expanded and contracted. The cover body 12 attached to the tip of the tip pool 11 has an upper side with a length of about 273' of the total length of the lower pool 6, a lower side with a length of about 1/3, and the left side in the figure is formed diagonally. There is. A bottle hole 21 for connecting the hydraulic cylinder 9 is provided at the upper part of the lower boom 6 at a position of about 173 from the left end, and at the lower part of the cover body 12, the entire length is l.
A bottle hole 22 for directly connecting the hydraulic cylinder 1B is provided at a position of about /2. Further, a shaft support 23 is fixed to the left end position of the upper part of the cover body 12.
A roller 24 that contacts the upper surface of the lower boom 6 is pivotally supported on the shaft support 23, and the shaft support 24 is supported on the upper surface of the cover body 12.
3 is a rolling mechanism 41 which is a step elimination mechanism.
is the provision.

FIG. 6 shows a cross section at the right end A in FIG. is spindle 2
8 is fixed, and rollers 29 that contact the lower outer circumference of the tip boom 11 are rotatably supported on the left and right sides between the auxiliary plates 26, respectively, and a lower boom 6 and a roller 29 are rotatably supported in the center of the support shaft 28. A pulley 30 that rotates a chain (wJ not shown) that connects the tip pool 11 is pivotally supported. The auxiliary plate 26 also includes a slider 31 that contacts the outside of the tip pool 11 and a slider 32 that contacts the inside of the cover body 12.
is the provision.

Next, FIG. 7 shows a cross section at the right end B in FIG. A pin 34 is installed between the side surface of the branch 23 and this branch piece 33, and the roller 24 is pivotally supported on each pin 33. A liner 35 that contacts the side surface of the lower boom 6 is fixed to the side surface of the cover body 12, and the middle boom 10 is attached to the lower boom 6.
The liner 36 that comes into contact with the outer periphery of the sleeve is firmly fixed.

FIG. 8 shows the rolling mechanism 41 in detail. An opening 42 is formed at the center of the lower end (left side in FIG. 8) of the cover body 12, and shaft support pieces 43 are formed on the left and right sides of the base of the opening 42. is fixed to this shaft support piece 43, and a two-shaped lever 4 is attached to this shaft support piece 43.
4 is pivotally supported by a pin 45, and one end of this lever 44 is exposed on the upper surface of the cover body 12, and the other end is maintained in a state facing the lower pool 6. A roller 46 is rotatably supported at the lower end of this lever 44 by a pin 47. Further, an end holder 48 is fixed to the upper part of the cover body 12, and the cylinder end of a hydraulic cylinder 49 is connected to this end holder 8, and the upper end of the lever 44 is connected to the tip of the cylinder rod 50. are connected by a pin 51. A contact rod 52 is attached to this cylinder port/rad 5o toward the cover body 12.
is fixed to the upper surface of the cover body 12, and this contact rod 5
A pair of limit switches 53 and 54 are attached so as to sandwich the two limit switches. Further, a detector 55 for detecting the upper end of the lower pool 6 is fixed in the opening 42 of the cover body 12 between the rollers 24 and 46.

Next, FIG. 9 shows the hydraulic circuit of this embodiment, in which a hydraulic pump 56 is directly connected to an engine 57, and the suction side of this hydraulic pump 56 is connected to an oil tank 58.
The discharge side is connected to a three-way switching valve 59. Switching valve 59
is connected to the hydraulic cylinder 9, and the hydraulic cylinder 9
A hydraulic cylinder 18 is connected to the discharge side of the hydraulic cylinder 18, and a switching valve 59 is connected to the discharge side of the hydraulic cylinder 18. Further, a hydraulic cylinder 60 and a three-way switching solenoid valve 61 are connected in parallel to the switching valve 59, and the hydraulic cylinder 49 is connected to the solenoid valve 61. The detector 55 detects whether or not the lower boom 6 is present in front of the detector 55, and outputs separate signals in each state, and the signal output when the lower boom 6 is not present. is connected to the positive side of the solenoid valve 61 via a switch 62, and the signal output when the lower boom 6 is present is connected to the opposite side of the solenoid valve 61 via a switch 63. Further, a limit switch 54 for resetting is connected to the switch 62 side, and a switch 53 for resetting is connected to the switch 63.
is connected.

Next, the operation of this embodiment will be explained.

, Figures 2 and 3 show the state in which the lifting boom body 13 is reduced and the lifting platform 16 is lowered to the lowest position.
In this state, a worker gets on the lifting platform 16, materials are placed thereon, and the lifting platform 16 is raised. To raise the lifting platform 16, the engine in the power supply box 4 is activated to generate hydraulic pressure, and each hydraulic cylinder 9.18 and the front boom 1 are activated.
When hydraulic pressure is supplied to the hydraulic cylinders 60 for telescoping, which is carried out by supplying hydraulic pressure to each of the hydraulic cylinders 60 housed in the hydraulic cylinders 1 and 1, the middle poom lO is slid and pulled out from the lower pool 6, and the front boom 11 is moved into the middle. Slide it out from the boom IO to increase the spacing between the pins 7.15. Furthermore, the extension of the hydraulic cylinder 9 rotates the lower boom 6 about the pin 7, and lifts the telescopic boom body 13 so as to tilt it with respect to the vehicle body 1. The extension speed of the telescopic boom body 13 by the hydraulic cylinder 60 housed in the front boom ll and the telescopic boom body 1 by the hydraulic cylinder 9
When the tilting speeds 3 and 3 are synchronized, the pin 15 of the cover body 12 rises perpendicularly to the vehicle body l. Also, the hydraulic cylinder 18
The elevating table 16 rotates around the pin 15 due to the extension force, acting to enlarge the angle between the cover body 12 and the elevating table 16, and by synchronizing the amount of extension of the hydraulic cylinders 9 and 18, the elevating table 16 is parallel to the vehicle body 1, and the vehicle body 1, the telescopic boom 13, and the lifting platform 16 are formed in a two-shape when viewed from the side. Once the lifting platform 16 has risen to a predetermined height position, when the operator stops the operation of each hydraulic cylinder 9, 18 and the hydraulic cylinder 60 in the tip pool 11, the lifting platform 16 is held at that height position. , and can perform work such as assembly, repair, and painting at heights.

During the telescopic operation of the telescopic boom body 13, the roller 24 comes into contact with the upper surface of the lower boom 6 and moves while rolling. Since there is a gap between the cover body 12, the lower boom 6, the middle boom 10, and the front boom 11, looseness will occur and there is a risk of deformation due to the load. 18 to the pin hole 22, and the cover body 12
A stress that bends it downward will be applied. However, as mentioned above, since the roller 24 is rolling on the upper surface of the lower pool 6, the load is supported by the roller 24 and transmitted to the lower pool 6, so the cover body 12 can move the lifting platform 16 without being deformed. The tip of the pool 1 while maintaining that height.
1 and extends upward. If the lower boom 6 continues to move relative to the cover body 12, the upper end of the lower boom 6 will eventually pass the lower surface of the roller 46, but the detector 55 detects the position of the upper end of the lower boom 6. is,
A signal is transmitted from the switch 62 to the solenoid valve 61 to operate the hydraulic cylinder 49 and push out the cylinder rod 50. With this movement of the cylinder rod 50, the lever 44 moves the pin 4
5 in a counterclockwise direction to bring the roller 46 into contact with the upper surface of the middle boom IO. At this time, cylinder rod 5
0 contact rod 52 contacts the limit switch 62, the solenoid valve 61 closes to open the switch 62, the hydraulic cylinder 49 is held in the state shown in FIG.
6 remains in contact with the middle boom 1°. Therefore, even if the lower boom 6 is pulled out further and releases contact with the rollers 24, the rollers 46 are still in contact with the middle boom 10, so the load on the lifting platform 16 is transferred to the cover body 12, the rollers 46, and the rollers 46. is transmitted to the middle boom lO through the middle boom 1
The distance between G and the cover body 12 remains parallel.

FIG. 11(a) shows the initial state of expansion, in which the load applied to the pin hole 22 is supported by the roller 24.

Then, as the telescopic boom 13 continues to extend, the lower boom 6 will be pulled out from the cover body 12, and the rollers 24 will be separated from the upper surface of the lower boom 6 (see FIG. 8 (b)). At this time, the roller 46 is in contact with the upper surface of the middle pool 10, and the load applied to the pin hole 22 is transmitted to the cover body 12 via the roller 46, and the distance between the cover body 12 and the tip pool 11 is maintained in parallel. be done. Further, the middle pool 10 is pulled out and the front pool 11 is pulled out.
As the distance between the roller 46 and the tip of the boom increases, the roller 46 rolls on the middle boom 10 and finally moves to the tip of the middle boom 10, stopping in the state shown in FIG. This is the position of maximum extension of the body 13. thus,
The contact rolling of the rollers 24 and 46 is switched, and the telescopic boom body 13 slides smoothly. Further, when the telescopic boom body 13 is contracted, the roller 46 is in contact with the middle pool 10, but the lower boom 6 contacts the roller 24 and starts rolling, and the tip of the lower boom 6 is at the position of the detector 55. When the sensor 55 moves to this point, the detector 55 transmits a signal to the switch 63 to operate the solenoid valve 61 in the opposite direction. Therefore, the hydraulic cylinder 49 retracts its cylinder rod 50 and the lever 4
4 in a clockwise direction about the pin 45 to separate the roller 46 from the middle pool 10, resulting in the state shown in FIG. When the lower boom 6 is further inserted into the cover body 12, the lower boom 6 can move past the lower part of the roller 46.

〔Effect of the invention〕

Since the present invention is configured as described above, the load of a large lifting platform that is approximately the same size as the vehicle body can be supported by the cover body, and the load applied to this cover body can be transmitted one after another to the telescopic boom body by the rollers. can.

For this reason, even if a step formed by multiple booms of the telescopic boom body occurs during operation, the two rollers will follow to eliminate the step, and even if the telescopic boom body is extended for a long time, the lifting platform can reliably support the load of

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a side view showing the elevating platform lowered to the lowest position, Fig. 3 is a front view of the same, and Fig. 4 is the elevating platform shown in the lowermost position. FIG. 5 is a side view showing the configuration of the telescopic boom body; FIG. 6 is a sectional view taken along line A-A in FIG. 5; FIG.
8 is an enlarged sectional view showing the vicinity of the rolling mechanism, FIG. 9 is a hydraulic circuit, FIG. 10 is an enlarged sectional view showing the operation of the rolling mechanism, and FIG. FIG. 3 is an explanatory diagram showing the operation of the telescopic boom body. l---Car body, 6--Lower boom, 1G-Middle boom, 11--Target boom, 12--Cover body, 16
・-・-lifting platform, 24.46--roller, 41-・
-・Rolling mechanism. Patent applicant Hikoma Manufacturing Co., Ltd. Agent
Patent Attorney Akiaki Hibi No. 1 Figure 2 Figure 3 Figure 6 Figure 7

Claims (1)

[Claims] It consists of a movable vehicle body, a flat elevating platform placed above the vehicle body, and a telescopic boom body placed between the vehicle body and the elevating platform, which is extendable and retractable by inserting multiple booms in its length direction. In a lifting device that can raise and lower a lifting platform in the vertical direction by extending and contracting each boom of a telescoping boom body, a cover body is provided on the topmost boom of the telescoping boom body so as to cover this boom. provided, the cover body rolls on the top surface of each boom of the telescopic boom body, and
An elevating device characterized by being provided with a step elimination mechanism that can overcome steps between booms.