JPS582198A - 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 materials and lowering unnecessary parts from a work station vXt for actual work, and in particular, a The present invention relates to an elevating device equipped with an elevating mechanism that can make the length of the maximum extended state longer than the length of the elongated state.

Lifting devices that raise and lower platforms are 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 and lowered. . In this conventional lifting device, a pair of arms are pivoted at the center to make one set, and a pantograph-like extension mechanism is used in which multiple sets of arms are connected in the vertical direction, and the maximum lift of the lifting device is In order to increase the height, it was necessary to increase the length of each arm or to increase the number of connected arms. For this reason, if the lifting height is designed to be reduced, the height of the lifting device with the telescoping mechanism folded will be reduced, making it difficult for workers to get on and off the platform, or to load and unload materials. was bothersome. For this reason, an elevating mechanism has been devised in which a plurality of booms are telescopically inserted into an arm so that one arm can extend in its length direction. However, with this configuration, it is not possible to control the amount of expansion and contraction of each boom housed in the arm, and the platform swings left and right, making it difficult to control it to lift it straight upward.

In view of the above-mentioned drawbacks, the present invention has been developed by constantly regulating the amount of expansion and contraction when a pair of stored booms is expanded and contracted from the middle boom, so that the lifting platform can be moved up and down in the vertical direction. To provide an elevating device whose length in a fully extended state can be made larger than the length in its fully extended state, and which can lift an elevating platform with a roar.

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

Reference numeral 1 in the figure is a truck body, and 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, respectively, and a driver's cab 4 is installed above the front wheel 2. Outriggers 5 11 are fixed to the center of the middle rest 1 and to the left and right of the rear end, respectively. A lifting mechanism 6 is placed on the top surface of the vehicle body 1, a lifting platform 1 is installed on the top of the lifting mechanism 6, and a handrail 8 is provided around the lifting platform 1. 1
A kick mechanism 9 is fixed in the center. Said elevator-
Each middle boom is 10. Lower pool 11. It consists of an upper boom 12. The center of each middle pool 10 is connected by a connecting shaft 13 so as to be rotatable in an X-shape, and connecting pieces 14 and 15 are fixed to the tips of each of the lower pool 11 and the upper pool 12, respectively. Connecting piece 14
is rotatably connected to a fixed piece 1G fixed on the vehicle body 1 by a pin, and the connecting piece 15 is rotatably connected to a fixed piece 17 fixed to the lower surface of the elevator platform l by a pin.

The intervals between the fixed pieces 16 and the fixed pieces 11 are the same, and as the telescopic boom extends in an X-shape, the vehicle body 1 and the lifting platform 1 become parallel to each other. Further, the kick mechanism 9 is provided on the vehicle body 1 and is located between both rotary pieces 16, and this kick mechanism 9 is composed of a hydraulic cylinder 18 that expands and contracts in the vertical direction. A push-up rest 19 is fixed to the upper end of the pool 18, which contacts the lower center surface of the middle pool 10.

Next, FIGS. 4 and 5 show the above-mentioned telescopic boom, that is,
This shows the internal structure of the middle pool 10.
0 has a structure in which a thin steel plate is bent and the cross section is hollow in the length direction, and a plate 20 is fixed to the center by cutting 4 to divide the inside into two parts. Shitaya. A lower boom 11 and an upper boom 12 are inserted into each chamber divided by the partition plate 20 in the middle boom 10, and the lower boom 1
Holders 21.22 are fixed to the outer ends of each of the upper and lower booms 10 and 12, and guide bodies 23.2 that contact the inner wall of the middle boom 10 are respectively attached to the holders 21.22.
4 is kept and is on the bottom.

The upper boom 11.12 slides within the middle boom 10 by means of this guide body 23.24. A hydraulic cylinder 25 is housed inside the lower boom 11 along its length, and the base 11 of the hydraulic cylinder 25 is connected to the lower boom 11 by a pin 26.
The cylinder rod 27 of No. 5 is connected to the middle pool 10 by a pin 28. Also, a sprocket wheel 29 is rotatably supported by a support shaft 30 inside the upper part of the middle pool 10 (on the lifting platform 7 side). Both ends of the chain 31 wound around the sprocket wheel 29 are connected to the ends of the lower pool 11 and the upper pool 12, respectively.

Next, the operation of this embodiment will be explained.

First, operate the engine (not shown) attached to the vehicle body 1,
This engine drives a hydraulic mechanism to generate oil pressure. This oil pressure is applied to the hydraulic cylinder 18 and each middle boom 10.
It is supplied to the hydraulic cylinder 25 housed in the. For this reason,
The hydraulic cylinder 25 attempts to extend in its length direction and acts to pull out the lower pool 11 from the middle pool 10, but when the telescopic boom is at rest as shown in FIG. Since no component force is generated in the direction of rotation in an X-shape around the connecting shaft 13, the lifting platform 1 does not rise. However, since oil pressure is also supplied to the hydraulic cylinder 18, the hydraulic cylinder 18 expands, and the push-up body 19 contacts the center of the middle-stage pool 10, causing the middle-stage pool 10 to
acts to push up each intermediate pool 10 to the connecting shaft 1
Lift it up so that it forms a slight X shape with point 3 in the center. When the kick mechanism 9 changes the telescopic boom from its straight rod state to a slightly crossed state, the elevating mechanism 6
gradually widens its opening angle. This hydraulic cinder 25
During the extension, the cylinder rod 21 protrudes from the hydraulic cylinder 25 to widen the gap between the bins 26 and 28, thereby pulling out the lower boom 11 from the middle boom 10. As the lower boom 11 slides within the middle boom 10, the chain 31 is pulled, and the chain 31 pulls the upper boom 12 while rotating the sprocket 29, and the upper boom 12 is also slid within the middle boom 10. It will be projected from the middle boom 10. From this,
Lower pool 11. The upper booms 12 each slide in the opposite direction from the middle boom 10, and the amount of movement thereof is the same, and they extend by the same amount of protrusion from both ends of the middle boom 10. From this, connecting piece 14.15f
The interval between l is expanded by the action of the hydraulic cylinder 25, and the middle boom 10 rotates in an X-shape around the connecting shaft 13, and the lifting platform 1
to rise high. The state shown in FIG. 2 is the state in which the elevating mechanism 6 is fully extended, and the lower pool 11. The middle, lower, and upper booms 10 are in a fully extended state so that the upper booms 12 can each extend to their respective length limits.
．． The total length of 11°12 is approximately 3 times the length of the middle boom 10 only.
The height of the lift platform 7 will be increased to about double the size, and the lift platform 7 will be raised high by a set of lift booms arranged in an X-shape in the vertical direction.

Conversely, each hydraulic cylinder 2 is used to lower the elevator platform 7.
By reducing the hydraulic pressure in the middle boom 5, the lower boom 11 and the upper boom 12 are gradually pushed into the middle boom 10, narrowing the distance between the connecting pieces 14 and 15, and the middle boom 1 is gradually pushed into the middle boom 10.
0 is rotated around the connecting shaft 13 to lower the elevator platform 1. The lower boom 11 and the upper boom 12 form the middle boom 10.
The middle boom 10 comes into contact with the push-up body 19, and then the hydraulic cylinder 18 contracts, so each telescopic boom is in a straight line, and the lifting platform 1 reaches its minimum height as shown in Figure 1. position.

Since the present invention is configured as described above, the maximum extension length of the boom of the elevating mechanism with telescopic function can be increased compared to when it is stored, and the number of mechanism components can be reduced, and the elevating platform can be lifted higher. be able to.

In addition, compared to the conventional panda graph type culm mechanism, there is no need to connect multiple links in the vertical direction, so when the lifting mechanism is stored at the lowest position of the lifting platform, the height can be lowered. @It is useful when moving the stomach.

[Brief explanation of drawings]

Fig. 1 is a side view of the lifting platform shown in an embodiment of the present invention when it is lowered; Fig. 2 is a side view of the lifting platform shown above when it is at its maximum elevation; Fig. 3 is a rear view of the same; FIG. 4 is a side sectional view of the telescopic boom of the elevating mechanism, and FIG. 5 is a sectional view of the same. 1... Vehicle body, γ... Lifting platform, 10... Middle boom, 11... Lower boom, 12... Upper boom, 25
...Hydraulic cylinder, 31...Chain. Patent applicant Mitsuhiro Kishi Patent attorney Jundo Koyoko Patent attorney Susumu Murai

Claims (1)

[Claims] A pair of internal hollow middle booms are placed slightly in the center of each
The upper and lower booms, which extend and retract at their respective ends, are slidably inserted into each middle boom, and between the ends of the upper and lower booms within the middle boom. are connected by a strip, and the middle and upper booms are opened. Each end of the upper boom is pivoted to the lifting platform at a distance of lI!, and by activating the hydraulic switching switch, the upper boom and lower boom expand and contract at the same rate, and the lifting platform is A lifting device characterized by moving up and down.