JPS6232233Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention mainly relates to a wire detachment prevention device for a sliding sheave, which is disposed in front of a winch drum or the like to prevent the wire from winding loosely.

Generally, it is said that in order to wind wire around a winch drum through a normal sheave without winding it randomly, the distance from the sheave to the winch drum needs to be about 20 times or more the width of the drum.

By the way, for example, a transport vehicle A equipped with a winch device used for forestry as shown in FIG.
Since the size is restricted in etc.,
In front of the winch drum 1 installed below the loading platform 5, there is a sliding sheave 2 that can prevent irregular winding even over short distances, and the wire 3 to this sheave 2 is installed at the boundary between the control section 4 and the loading platform 5. A normal sheave 7 attached to the top of the supporting column 6
A configuration is adopted in which the wire is lowered through the guide roller 8 and wound around the winch drum 1.

Therefore, when there is no load, that is, when no tension is applied to the wire 3, the wire 3 becomes relaxed and becomes easily detached from the sheave 2. To prevent this, conventional methods have been to move the sliding sheave 2 laterally. Two guide rods 9, 9 longer than the width,
It was arranged near the outer periphery of this sheave 2 and along the moving direction.

However, it is impossible to arrange these guide rods 9, 9 in a narrow space from the standpoint of design and assembly work.

In order to eliminate these drawbacks, this invention has a wire guide that engages the wire wrapped around the sheave so as to hold the sheave, thereby preventing the wire from coming off the sheave, especially when no load is applied. The present invention aims to provide a device for preventing sheave wires from coming off.

Hereinafter, specific embodiments of this invention will be described based on the drawings.

In FIG. 2, 2 is a sliding sheave that can rotate and slide on a sheave shaft 10 disposed in front of the winch drum 1, and a wiper 3 is hung under the wire annular groove 2a of this sheave 2. A configuration is adopted in which the wire is wound in an orderly manner around the winch drum 1 via the rear guide roller 8.

Reference numeral 11 denotes a wire guide, and this guide 11 is made of, for example, a single elastic linear body, and has a curved portion 11a that is slightly larger than the curvature of the annular groove portion 2a in the middle portion, and has a curved portion 11a slightly larger than the outer diameter of the wire 3 at both ends. It is formed into engaging parts 11b, 11b, which have a somewhat large coil shape and whose winding interval L is equal to or larger than the outer diameter of the wire 3. 2a side, and engages the wire 3 wound around the annular groove 2a into the engaging parts 11b, 11b, so that the annular groove 2a is held by the wire 3 and the wire guide 11. It is assembled in a perfect condition.

Therefore, wire 3 at winch drum 1
When the winding work is not being performed, the wire 3 is relaxed and the weight of the wire 3 is applied to the engaging portions 11b, 11b, causing the curved portion 11 to bend as shown in the imaginary line in FIG.
a comes into contact with the annular groove 2a, and the wire guide 11
This holds the wire 3 so that it does not come off the annular groove 2a. In this case, wire 3
Since the wire 3 does not bend below a certain curvature, the wire 3 does not slip down extremely from inside the upper engaging part 11b, and it is of course possible in design to prevent the wire 3 from slipping down at least within the outermost periphery of the sliding sheave 2. That's true.

Furthermore, when a towed object or a suspended object is attached to the tip of the wire 3 and the winding operation is performed using the winch drum 1, the wire 3 has tension as shown by the solid line in FIG. The sheave 2 comes into contact with the groove 2a, and as the wire 3 moves, the sheave 2 begins to rotate.Meanwhile, the wire 3 is no longer held by the wire guide 11, and the curved portion 1
1a from the annular groove 2a by its own elastic force,
While leaving at a certain distance, the engaging portion 11
b and 11b act simply as guides for the wire 3.

Since this invention consists of the above structure, it does not require any installation space, and it is possible to prevent the wire from coming off the sheave with simple assembly work, and the two guide rods can be slid as in the conventional method. This eliminates the need to forcefully arrange the sheave in the narrow space where the sheave is located, which is advantageous from the standpoint of design and assembly work.

Furthermore, since it can be formed from a single linear body, it is inexpensive and easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing a transport vehicle using a conventional embodiment, Fig. 2 is a schematic perspective view of the main part implementing the sheave wire disconnection prevention device according to this invention, and Fig. 3 is an illustration of this invention. FIG. 3 is an enlarged side view showing an example according to the embodiment. Symbols, 2...Sliding sheave, 3...Wire, 11...Wire guide, 11a...Curved portion, 11b...Engaging portion.

Claims (1)

[Claims for Utility Model Registration] (1) A wire guide formed by forming a curved portion in the middle portion, and connecting from this to form engaging portions at both ends that engage with the wire hung on the sheave. is engaged with a wire wound around the sheave so as to hug the sheave, thereby preventing the wire from coming off from the sheave even under load or no load. (2) Practical use characterized in that the wire guide is made of a single elastic linear body, and has a curved part in the middle part and coiled engaging parts at both ends thereof. Scope of patent registration request No. (1)
Device to prevent sheave wire from coming off as described in section.