JPH0355594Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a method for lifting large formwork, substructure reinforcing bars, fittings, finishing materials, etc. by moving them over existing slabs in construction work, etc. Specifically, the crane is capable of automatically moving and lowering the boom, and adjusting the boom's rising angle (working radius) in conjunction with the mast's lifting and extending movements. This invention relates to a small and simple crane that improves the workability and adaptability of crane slinging and lifting operations, and also facilitates movement and transportation.

[Conventional technology]

Some conventional cranes use wires, cylinders, etc. to individually perform operations such as moving and lowering the boom, adjusting the rising angle (working radius) of the boom, and raising and lowering (extending and contracting) the mast. However, these are all limited to large cranes, and there are no small cranes that have a mechanism for adjusting the boom moving, tilting, and raising angle, or a mechanism for raising and lowering the mast. I haven't found anything that makes the crane more compact when moving or transporting it.

[Problem that the invention attempts to solve]

However, if the mechanism for raising, lowering and raising the boom angle and the mechanism for raising and lowering the mast are made independent, the structure would be complicated, so it would be extremely difficult to use it as is in a small crane. Have difficulty. Therefore, when incorporating these mechanisms into a small crane, for example, raising, lowering, and adjusting the rising angle of the boom, or raising and lowering the mast must be done manually (by human power).
Therefore, there was a problem in that preparation (assembly or disassembly) for use, transportation, movement, etc. was extremely troublesome.
In particular, when moving under a beam, it was necessary to fold the mast each time depending on the height of the machine, and some kind of improvement was desired.

The present invention was developed in view of the actual situation, and it is possible to automatically raise, lower, and adjust the raising angle of the boom in conjunction with the hoisting and raising/lowering operations of the mast. The working radius can be arbitrarily adjusted during slinging and lifting work, and when moving or transporting, the upper mast can be easily and quickly folded or the middle mast can be raised and lowered to change the boom support height (machine height). The purpose is to provide a small and simple crane with excellent workability.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the upper mast is connected to the upper end of the middle mast, which is held movably up and down by the lower mast, through a pin so as to be rotatable up and down. A jack for raising and lowering the middle mast and controlling the raising and lowering of the upper mast is attached to the lower mast to configure a mast that can raise and lower the middle mast and fold the upper mast, and A boom is pivoted to the upper mast, and the tip of the boom and one end of the guy support pivoted to the upper rear of the upper mast are connected via a tension member, and the other end of the guy support is connected to a predetermined position at the bottom of the mast. In this small simple crane, the crane is attached to the lower mast while being supported by the guy wire, which is always stretched to a constant length, in response to the height of the machine due to the expansion and contraction of the middle mast. The boom is characterized in that the boom is controlled to rise and fall through the expansion and contraction of the jack.

[Function] With this configuration, the raising and lowering of the upper mast and the raising and lowering of the middle mast are controlled by operating the jack attached to the lower mast. The boom is automatically raised and lowered, and the working radius is arbitrarily adjusted by controlling the raising angle of the crane by controlling the raising and lowering of the middle mast using the same jack.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 showing an embodiment of the present invention, a lower end of a lower mast 3 is attached to a movable cart 1 via a conventionally known turning means 2, and a jack 4 ( (Fig. 2) is attached. Incidentally, the jack 4 is constituted by, for example, a double-acting power cylinder or the like, and is forcibly driven in either direction of expansion or contraction.

The lower mast 3 is made up of, for example, four pipes in a square shape, and holes for inserting pins 5 and 6 are provided at the front and rear positions of the upper end of the lower mast 3, respectively. And inside the lower mast 3,
The middle mast 7, which is constructed by incorporating four square pipes into a rectangular shape, is built in so that it can be raised and lowered freely.
By removably coupling the lower end of the lower mast 3 to the upper end of the lower mast 3 via the pins 5 and 6,
The middle mast 7 can be moved up and down using the lower mast 3 as a guide.

On the other hand, pins 8 and 9 are provided at the upper end of the middle mast 7.
The lower end of the upper mast 10 is foldably connected to the upper mast 10 via a connecting rod 11, and the lower end of the upper mast 10 and the tip (upper end) of the cylinder rod of the jack 4 are connected via a connecting rod 11. Incidentally, this connecting rod 11 is pivotally connected to the lower end portion of the upper mast 10 via a pin 12.

In addition, the base end of the boom 14 is attached to the front end of the bracket 13 fixed to the upper end of the upper mast 10 with the pin 1.
At the same time, the intermediate portion of the guy support 17 is pivotally attached to the rear end of the bracket 13 via a pin 16 so as to be rotatable up and down. One end (upper end) of the guy support 17 and the tip of the boom 14 are connected via a tension member 18, and the other end (lower end) of the guy support 17 and the side surface of the lower mast 3 are connected by a guy wire 19. are connected via. 20 indicates the butt position of the guy wire 19.

In the small simple crane configured as described above, when the crane is used, as shown in FIG. ，
9, and the boom 14 is lifted and held at a predetermined angle via guy wires 19, guy supports 17, and tension members 18.

When folding the crane from this state, first remove the pins 5 and 6 connecting the lower mast 3 and the middle mast 7 with the support of the jack 4, and then fold the crane into the lower mast 3. Shorten the jack 4. Then, the middle mast 7 is lowered together with the upper mast 10 and stored inside the lower mast 3. Also, when the middle mast 7 and the upper mast 10 are lowered in this way, the guy wire 19 is loosened, so that the boom 14, which is connected to the guy support 17 via the tension member 18, moves around the pin 15 as shown in the figure. Accordingly, the guy support 17 rotates clockwise about the pin 15, and as the middle mast 7 is lowered, the boom 14 gradually falls forward.

Next, as shown in FIG. 2, when the front pin 8 of the pins 8 and 9 connecting the middle mast 7 and the upper mast 10 is removed and the jack 4 is extended, the rear As the upper mast 10 rotates counterclockwise in the figure (lodging rotation) around the pin 9 located at It collapses and becomes as shown in Figure 1A.

In addition, when assembling a folded crane, raise the upper mast 10 and fix it to the upper end of the middle mast 7 by the reverse procedure to the above, and then,
If the middle mast 7 is raised together with the upper mast 10, the boom 14 will automatically rise.

Also, when using the machine at a low height, that is,
When the middle mast 7 is used while being located inside the lower mast 3, the butt position 20 of the guy wire 19 is moved (adjusted) to near the lower end of the lower mast 3, as shown in FIG. 1B. Then, the butt position 20 of the guy wire 19 moves downward by the amount that the machine height is lowered, so that the boom 14 can be automatically raised by raising and rotating the upper mast 10.

That is, since the connection between the guy wire 19 and the lower mast 3 is changed according to the height of the machine, the boom 14 automatically rises in conjunction with the raising of the upper mast 10 regardless of the height of the machine. become.

In the embodiment described above, the butt position of the guy wire 19 is changed vertically, but as in the embodiment shown in FIGS. 3 and 4, the lower end of the guy wire 19 is placed at the lower end of the middle mast 7. They can also be combined. In this case, as shown in FIGS. 3B to 3F, the guy wire 1
Since the butt position 20 of 9 is automatically raised and lowered, there is no need for special adjustment work. Therefore, even if the middle mast 7 is held at an appropriate intermediate position and the machine height is arbitrarily changed, the boom 14 will automatically rise if the upper mast 10 is raised and rotated.

5A and 5B show an embodiment in which the rising angle of the boom 14 is arbitrarily adjusted; in this case, the lower end of the guy wire 19 is fixed to the butt 20 provided at the bottom of the lower mast 3; By telescopically operating the jack 4 and controlling the elevation and descent of the middle mast 7 as appropriate,
The guy wire 19 is connected to the guy support 17 and the tensile material 18.
Since the tip of the boom 14 is pulled up and lowered through the
4 is adjusted to the required standing angle. Although the guy support 17 in the figure has a triangular shape, the upper and lower limits of the boom can be adjusted by changing this shape and the position of the butt 20.

In addition, in all of the embodiments, the middle mast 7 is attached to the lower mast 3 so as to be able to rise and fall, but depending on the required machine height, the middle mast 7 of an appropriate length can be attached to the lower mast 3 and the upper mast 10. The support height of the upper mast 10 (the support height of the boom 14) may be changed by adding (attachment and detachment) in between. In this case, as in the case of the embodiment shown in FIGS. 1 and 2, the connection between the guy wire 19 and the lower mast 3 should be changed in principle.

[Effect of idea]

As explained above, according to the present invention, the jack attached to the lower mast is operated to raise and lower the mast, and the boom is automatically raised and lowered in conjunction with the raising and lowering movement of the upper mast that constitutes the upper part of the mast. In addition to being able to operate the boom, the rising angle of the boom can be arbitrarily adjusted by controlling the mast to move up and down. Therefore, the crane can be easily folded or assembled or the height can be quickly changed with one-touch operation using a push button switch, etc., and the working radius of the boom can be adjusted to adjust the unloading range, sling position range, and boom. The rotating work range of the machine is expanded, making it easier to carry out loading and unloading work. A small and simple crane with an optimal height according to usage conditions can be easily obtained, and the preparation time and man-hours required for use or transportation can be significantly reduced. In addition, the mast and boom can be folded to make the entire structure more compact, making it easier to move the crane above the floor, move up and down floors with a long span elevator, lift it up with a large crane, etc., and load it onto a truck during transportation. It is easy to unload, etc., and moreover, it can be transported to the site of use and assembled easily, so there is no need for special technicians such as assembly instructors, so it is easy to operate the crane. Necessary expenses can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of a small simple crane according to the present invention, in which A is a folded state, B is a side view showing a state in which the machine height is lowered, and C is a side view showing a state in which the machine height is raised;
Figure 2 also shows the operating state of the upper mast,
A is a schematic side view of the main parts showing the collapsed state, B is a schematic side view of the main parts showing the upright state, FIG. 3 shows another embodiment of the small simple crane according to the present invention, A is the folded state, and B to F are the machine heights Figure 4 is a side view of each state that has been changed, Figure 4 is a view taken in the direction of arrow A in Figure 3, Figures 5 A and B are schematic side views when adjusting the rising angle of the boom, and A shows the side view when the rising angle of the boom is adjusted. A small state and B indicate a state where the boom rising angle is large. 1...Moving trolley, 2...Swivel means, 3...Lower mast, 4...Jacket, 5, 6, 8, 9, 15,
16...Pin, 7...Middle mast, 10...Upper mast, 14...Boom, 17...Guy support, 1
8... Tensile material, 19... Guy wire, 20...
Shitte.

Claims (1)

[Claims for Utility Model Registration] (1) An upper mast is connected via a pin to the upper end of a middle mast which is held movably up and down by a lower mast so that the middle mast can be raised and lowered, and the middle mast is controlled to go up and down. , a jack for controlling the elevation of the upper mast is attached to the lower mast to configure a mast capable of raising and lowering the middle mast and collapsing the upper mast, and a boom is pivotally attached to the front of the upper part of the upper mast, and the top of the boom is and one end of a guy support pivoted to the rear of the upper part of the upper mast are connected via a tension member, and the other end of the guy support and a predetermined position at the bottom of the mast are connected via a guy wire. In a small simple crane,
Corresponding to the height of the aircraft due to the expansion and contraction of the middle mast, the boom is controlled to rise and fall through the expansion and contraction of the jack attached to the lower mast while being supported by the guy wire which is always stretched to a constant length. A small and simple crane with special features. (2) Registration of a utility model characterized in that the predetermined position at the lower part of the mast is one of a plurality of engagement parts provided in the vertical direction of the lower mast, corresponding to the machine height due to expansion and contraction of the middle mast. A small simple crane according to claim 1. (3) Request for registration of a utility model characterized in that the predetermined position at the lower part of the mast is an engagement part of a guy wire provided at a predetermined position of the middle mast so as to correspond to the height of the machine due to expansion and contraction of the middle mast. range 1
Small simple crane as described in section.