JPH0355597Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a post-type floor crane used for lifting small objects, miscellaneous materials, etc. at construction sites, etc., and is particularly useful when assembled from a folded position to a working position. , relates to a small and simple post-type floor crane whose boom is automatically raised to a predetermined angle.

[Conventional technology]

Traditionally, with small post-type floor cranes used at construction sites, etc., when changing the machine height (mast height) due to site height restrictions, etc., the guy wire that suspends the boom at a predetermined angle must be changed. Depending on the height of the machine being used, the guy wire may be replaced with one of the required length, or it may be added or adjusted, or the guy wire may be connected to the butt end connection at a different location.

[Problem that the invention attempts to solve]

However, it is necessary to prepare extra guy wires in order to replace them, add them, and make adjustments, and it is time-consuming to connect the guy wires to different butt joints, and the connections may be defective. If there were, there would be problems such as danger.

The present invention was made to improve the above-mentioned conventional problems, and its purpose is to replace the guy wire when changing the machine height due to height restrictions at the site, or to move the guy wire to a different position. A post that allows you to easily adjust the length of the guy wire when changing the machine height with a single touch without having to change the connection to the butt joint of the machine, and the boom is automatically raised to a predetermined angle when the machine height is changed. The purpose of this project is to provide a type floor crane.

[Means for solving problems]

In order to achieve the above object, the present invention includes a lower mast, a middle mast that can be raised and lowered along the lower mast, an upper mast that is pivotally attached to the upper part of the middle mast so that it can be raised and lowered, and a lower mast that can be raised and lowered. It consists of a boom that is pivotally attached to the upper part and is suspended so that it can be raised and lowered via a guy wire that has one end connected to the butt joint of the lower mast. In a post-type floor crane configured to be able to change the height posture by folding and standing up, a lower connecting part is provided at a predetermined position below the butt joint of the lower mast, and the lower end of the guy wire is connected to the lower mast. It is connected to the butt joint of the mast, and the guy wire is stretched with or without the lower connecting part depending on the height of the aircraft, or the butt joint of the lower mast includes a guy wire support bracket. has been
The lower end of the guy wire is fixed to the free end of the bracket, and as the bracket is vertically rotated, it is stretched through the lower connecting part or the upper connecting part in accordance with the machine height attitude. It is something.

[Effect]

In the above configuration, where the lower connecting part is provided at a predetermined position below the butt joint of the lower mast, the guy wire stretched to a predetermined length can be directly connected to the lower connecting part in accordance with the mode of expansion and contraction of the middle mast. The butt of the guy wire is fixed to the butt joint of the lower mast via the guywire support bracket by directly hooking it to the butt joint, with or without the aid of the lower mast, and the upper part of the butt joint is also attached to the upper part of the butt joint. If the crane is equipped with a connecting part, the crane can be raised to a higher height by rotating the bracket upward and tensioning the guy wire through the upper connecting part while maintaining the function of the lower connecting part. The boom can be automatically raised to a predetermined angle based only on the selection of the connecting portion.

〔Example〕

The present invention will be explained in detail below based on the illustrated embodiments.

Figure 1 shows the crane of the present invention assembled in a high position.
A lower mast 6 of the post-type floor crane 5 is attached to the upper surface of the swivel base 4. A middle mast 7 that can be raised and lowered along the lower mast 6 is incorporated inside the lower mast 6, and is provided at the upper end of the lower mast 6 and the lower end of the middle mast 7 in the illustrated raised position of the middle mast 7. The middle mast 7 is fixed to the upper part of the lower mast 6 by inserting pins 8 and 9 into the holes.

The lower part of the upper mast 10 is connected to the upper part of the middle mast 7 via pins 11 and 12, and by removing the front pin 12, the upper mast 10 is lowered rearward about the rear pin 11. A jacking mechanism 13 consisting of, for example, an electric cylinder is installed inside the middle mast 7 as shown in FIG.
The tip of the lower ram 13a of the jacking mechanism 13 is connected to the lower mast 6 to raise and lower the middle mast 7, and the tip of the upper ram 13b is connected to the link 13c.
The upper mast 10 is connected to the lower end of the upper mast 10 via the upper mast 10 so that the upper mast 10 can be raised and lowered.

A base end of a boom 15 is pivotally attached to the front of a bracket 14 fixed to the upper end of the upper mast 10.
A guy support 16 is pivoted at its middle portion to the rear of the bracket 14, the tip of the guy support 16 is connected to the tip of the boom 15 via a first guy wire 17, and the rear end is connected to a predetermined position of the lower mast 6. A second connecting portion 18 consisting of a sheave provided at a position
The boom 15 is connected via a guy wire 19 and suspended at a predetermined angle. As shown in FIG. 3, the lower mast 6 has a lower connecting part of a second guy wire 19, which is also made of a sheave, located below the butt joint part 18 by a distance equivalent to approximately 1/2 of the height of the middle mast 7. 20 are provided.

The tip of a suspension wire 21 is fixed near the base end of the boom 15 via an overload detector 22, and the suspension wire 21 suspends a hook 24 from the tip of the boom 15 via a suspension pulley 23, and a tip pulley 25. The remaining length is guided by an intermediate pulley 26 and wound around a winch 27 on the swivel base 4.

FIG. 4 shows the crane 5 in its folded state, with the middle mast 7 being lowered inside the lower mast 6, and the upper mast 10 being moved backwards around the rear pin 11 with the lower front pin 12 removed. The boom 15 also connects the first and second guy wires 1.
7 and 19 are relaxed and laid down horizontally along the upper mast 10. The crane 5 is transported or stored in this folded position. To assemble the lower, middle, and upper masts 6, 7, and 10 from this folded position to the high altitude position shown in FIG. By pulling 13b into the upper ram of the jack mechanism 13 while still connected, the upper mast 10 stands up with the rear pin 11 as the pivot. Then, the front pin 12 is inserted to fix the upper mast 10 and the middle mast 7 together. FIG. 5 shows this state, in which the second guy wire 1
9 is still relaxed, and the boom 15 cannot be raised by pulling the guy support 16, and the boom 15 is lowered vertically along the middle and lower masts 7, 6.

Next, the lower ram 13a of the jacking mechanism 13 is pushed out to raise the middle mast 7 above the lower mast 6, and the pins 8 and 9 are inserted to fix the lower mast 6 and the middle mast 7 together. As the middle mast 7 rises, the second guy wire 19 is pulled to raise the guy support 16, and therefore the boom 15 is pulled by the first guy wire 17 and automatically raised to a predetermined angle, as shown in FIG. It is assembled in a high-altitude position.

When using the crane 5 in a low machine height position with a two-stage configuration of lower and upper masts 6 and 10 due to site height restrictions, etc., the butt end of the second guy wire 19 is connected to the butt end in the folded state shown in FIG. When the upper mast 10 is erected and then extended by hanging it around the lower connecting part 20 as shown by the two-dot chain line in FIGS. 3 and 4 while connected to the upper mast 18, the posture shown in FIG. Thereafter, the guy support 16 is immediately pulled by the second guy wire 19 of a predetermined length, and the boom 15 is automatically raised and assembled into a low height attitude as shown in FIG.

FIG. 7 shows another embodiment of the butt joint portion of the second guy wire 19. In this embodiment, the butt joint portion 18' of the lower mast 6 includes a guy wire support bracket 28, and its base. The ends of the brackets 28 are pivotally connected with horizontal bolts 29 so that the brackets 28 can freely rotate in the vertical direction, and the butt ends of the second guy wires 19 are attached to the free ends of the brackets 28, while the ends of the butt joints 18' An upper connecting part 30 and a lower connecting part 31 each having a sheave structure are provided above and below. In addition, each distance between the butt joint part 18', the upper connecting part 30, and the lower connecting part 31 is the height dimension of the middle mast 7 (expandable change height).
approximately 1/2 of that to correspond to the expansion and contraction of the middle mast.
Then, by rotating the guy wire support bracket 28 upward and hooking the second guy wire 19 to the butt joint portion 18' via the upper connecting portion 30,
As shown in FIG. 8, when the crane 5 is assembled in a high position, the boom 15 is automatically raised to a predetermined angle, rotates downward, and connects the second guy wire 19 to the lower connecting portion 31. through the butt joint 18'
As shown in Figure 9, if you hang it on the
When the crane 5 is assembled in a low height position, the boom 15 is automatically raised to a predetermined angle.

[Effect of idea]

As detailed above, according to the present invention, in a post-type floor crane that can be converted into a folded position, a low machine height position, and a high machine height position, the lower mast is mounted at a predetermined position below the butt joint of the lower mast. For models with a connecting part, the second guy wire can be simply hung around the lower connecting part or unhooked, and for models with first and second connecting parts above and below the bottom connecting part, the guy wire can be easily supported. By simply rotating the bracket upward or downward and hooking the second guy wire to the upper upper connection part or the lower lower connection part, you can streamline the hanging of a fixed length guy wire due to the high attitude of the machine. Since the boom is automatically raised to a predetermined angle, it is necessary to prepare guy wires of different lengths depending on the machine height, as with conventional small post-type floor cranes that can change the machine height. This eliminates the need to change connections to the butt joints in different positions, and also avoids the risk of accidents due to connection failures caused by connection changes, which significantly improves the efficiency and safety of on-site work. play.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an overall side view in a high-altitude position, Fig. 2 is a side view of the jacking mechanism, Fig. 3 is a side view of the butt joint, and Fig. 4 is a folded position. 5 is an overall side view in the middle of conversion to a high aircraft height, FIG. 6 is an overall side view in a low aircraft height posture, and a side view of another embodiment of the butt joint shown in FIG. 7.
Fig. 8 is an overall schematic side view of the assembled state in a high machine height position by applying the embodiment shown in Fig. 7, and Fig. 9 is an overall schematic side view of the state in which the embodiment shown in Fig. 7 is applied and assembled in a low machine height position. FIG. 5...Post-type floor crane, 6...Lower mast, 7...Middle mast, 10...Upper mast,
15...Boom, 17...1st guy wire, 1
8, 18'...Hip joint part, 19...Second guy wire, 20...Lower connecting part, 28...Guy wire support bracket, 30...Upper connecting part, 31...
Lower joint.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A lower mast, a middle mast that can be raised and lowered along the lower mast, an upper mast that is pivotally attached to the upper part of the middle mast so that it can be raised and lowered, and It consists of a boom that is pivotally attached to the upper part and is suspended so that it can be raised and lowered via a guy wire that has one end connected to the butt joint of the lower mast. In a post-type floor crane configured to be able to change the machine height posture by folding and standing up, a lower connecting part is provided at a predetermined position below the butt joint of the lower mast, and the crane's low machine height is In the posture, the lower end of the guy wire is hooked to the butt joint through the lower joint,
This corresponds to the contraction of the middle mast, and when the crane is in a high position, the lower end of the guy wire is directly hooked to the butt joint without going through the lower connecting part, so that it corresponds to the extension of the middle mast. A post-type floor crane characterized in that the boom is automatically held at a predetermined angle while the guy wire is held at a fixed length. (2) The butt joint of the lower mast includes a guy wire support bracket whose proximal end is pivoted so as to be rotatable in a vertical plane, and the butt of the guy wire is fixed to the free end of the bracket. On the other hand, an upper connecting part is also provided at a predetermined position above the butt joint, and when the crane is in a high position, the guy wire is connected to the upper connecting part when the bracket is rotated upward. A post-type floor crane according to claim 1 of the utility model registration claim, characterized in that the post-type floor crane is stretched across a section.