JPH10182064A - Trolley crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely lift and convey a heavy construction material. SOLUTION: A groove shaped wheel 17, which is placed on an upper pipe 3 of a rail 2 so as to be rolled, is installed in the upper part of a crane main body 12 freely rotatably, while in the lower part of the crane main body 12, freely rotatable guide rollers 22, 24, 25 clamping a lower rail 4 of the rail 2 are arranged in three points. When a trolley crane 11 is moved along the rail 2, the trolley crane 11 is guided by means of the guide rollers 22, 24, 25 so as to be moved along the rail 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction site, in which a building material is movably mounted on a rail disposed outside a site structure, and a building material is lifted by a suspended hoist and simultaneously transported to a required position. Trolley crane.

[0002]

2. Description of the Related Art A rail having upper and lower two pipes connected in parallel is arranged outside a site structure, and a trolley crane is movable along the rail on this rail, and is suspended below the trolley crane. A device for lifting and transporting building materials with a hoist has already been proposed.

A conventional trolley crane has a structure in which a plurality of wheels mounted on rails are provided on an upper part of a trolley crane body which is fitted to a rail, and a hoist is hung below the main body.

[0004]

By the way, in a structure in which a plurality of wheels hang and move in a monorail shape, the radius of curvature at a corner portion of the rail must be increased, and therefore, the arm for supporting the rail must be long. It is necessary to make the rail protrude greatly outside the site structure,
When the length of the arm is long, the arm is easily bent, and there is a problem that a heavy building material cannot be lifted.

Further, the trolley crane must be able to move smoothly along the rails and not to swing or rotate when the building material is lifted. However, there is a problem that swinging occurs with a portion where the wheel rests on the rail as a fulcrum.

Accordingly, an object of the present invention is to reduce the radius of curvature of a corner portion of a rail and to shorten a length of an arm for supporting a rail, so that a heavy building material can be lifted and movement along the rail can be smoothly performed. An object of the present invention is to provide a trolley crane that does not swing or rotate when building materials are lifted.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that an upper part of a crane body which is externally fitted to a rail in which two upper and lower pipes are connected in parallel is provided. A rotatable grooved wheel mounted on the upper pipe is rotatably mounted, and guide rollers which are circumscribed to the lower pipe and are rotatable respectively at the lower side of the crane body at both sides of the lower pipe. It employs a configuration in which it is mounted in a point arrangement.

Here, the crane main body is provided with a hoist hanging portion at a lower portion, and the guide roller is rotatably mounted on a shaft erected at the lower portion of the crane main body via a bearing.

[0009]

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

As shown in FIG. 1 and FIG. 4, a rail 2 disposed outside the on-site structure 1 is formed by connecting an upper pipe 3 and a lower pipe 4 in parallel with a connecting plate 5 to form a rail. The connecting plate 5 is bolted to the tip of an arm 7 protruding from a support 6 erected on the object 1 so as to surround the outer periphery of the on-site structure 1. The rail 2 includes a straight rail and a corner. Assembled by connecting curved rails.

FIGS. 1 to 3 show a trolley crane 11 mounted so as to move along the rail 2. The crane main body 12 has a vertically long U-shaped upper frame 13 on one surface side. The two brackets 14 are fixed to face each other, and the upper frame 1
3 is formed by fixing a horizontal bottom plate 15 between the upper surfaces of the portions bent right below, and extending a bolt 16 for suspending the hoist 8 at a lower position between the two brackets 14. The space between the lower end of the upper frame 13 on the site structure side and the bottom plate 15 is open to allow the arm 7 to escape.

On the upper frame 13 of the trolley crane 11, a large-diameter grooved wheel 17 which rolls on the upper rail 3 is rotatably mounted on a shaft 18, and the trolley crane 11 is hung on the upper rail 3. It is designed to be worn down.

On the bottom plate 15 of the crane main body 12, one shaft 19 is located at a position on the site structure side on both sides of the lower rail 4, and two shafts 20, 2 are located at positions closer to the outside.
1, a large-diameter guide roller 2 is mounted on the inner shaft 19.
2 are rotatably mounted via bearings 23, and two outer shafts 20, 21 are provided with small-diameter guide rollers 24,
25 is rotatably mounted via a bearing 26.

As shown in FIG. 3, the guide rollers 22, 24, and 25 are arranged at three points in a plane with the lower rail 4 interposed therebetween. At the same time as preventing rotation, the trolley crane 11 serves to guide the trolley crane 11 along the plane shape of the rail 2 when moving along the rail 2.

As described above, only one large-diameter grooved wheel 17 is mounted on the upper rail 3 so as to be suspended, and the guide rollers 22, 24, and 25 are positioned directly below the wheel 17 in a curved shape. By providing one inside and two outside at three-point arrangement, the curved portion of the rail 2 can move smoothly even with a small diameter, whereby the radius of curvature of the corner portion of the rail 2 can be reduced, and the rail 2 It is not necessary to protrude greatly outside of the arm, and it is possible to lift a heavy building material by shortening the arm 7.

The trolley crane of the present invention is constructed as described above, and as shown in FIGS.
The trolley crane 11 is hung on the rail 2 with the grooved wheels 17 placed thereon, and the lower bolt 4 The hoist 8 is suspended in the
The trolley crane 11 is moved along to transport the building material to a desired position. The guide rollers 22, 24, and 25 rotate smoothly when they come into contact with the lower pipe 4 when the trolley crane 11 moves. It will guide the movement.

[0017]

As described above, according to the present invention, a rotatable guide roller which mounts a grooved wheel mounted on a pipe above a rail above a crane main body and sandwiches a lower rail from both sides below a crane main body. Is installed so that the curved part of the rail can pass smoothly even if the diameter is small, so that the radius of curvature of the corner of the rail can be reduced, and the rail protrudes greatly outside the site structure Since there is no need to make the support arm shorter, it becomes possible to lift a heavy object.

Further, the three-point arrangement of the guide rollers sandwiching the lower rail can prevent the trolley crane from swinging and rotating, and can safely lift and transport building materials.

[Brief description of the drawings]

FIG. 1 is a front view of a trolley crane.

FIG. 2 is a side view of the trolley crane.

FIG. 3 is a cross-sectional plan view of the trolley crane.

FIG. 4 is a longitudinal sectional view showing a use state of the trolley crane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Field structure 2 Rail 3 Upper pipe 4 Lower pipe 6 Prop 7 Arm 8 Hoist 11 Trolley crane 12 Crane main body 13 Upper frame 14 Bracket 15 Bottom plate 17 Slotted wheel 18 axis 19, 20, 21 axis 22, 24, 25 Guide roller 23, 26 Bearing

Claims (1)

[Claims] 1. A rotatable groove-shaped wheel mounted on an upper pipe and rotatably mounted on an upper part of a crane main body which is externally fitted to a rail in which two upper and lower pipes are connected in parallel. A trolley crane in which guide rollers, which are circumscribed to the lower pipe and are rotatable each other, are mounted at three positions on both sides of the lower pipe sandwiching the lower pipe.