JPS6218622Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a technique for preventing a wire rope for lifting a load used in a crane from flying out from a guide pulley attached to a boom.

As shown in Fig. 5, when a commonly used crane performs cargo handling work with an additional boom B attached to the tip of the boom A, the wire rope 3 is attached to the boom head A4.
A secondary hook 5 is suspended via the upper guide pulley 1 and the pulley 4 at the tip of the additional boom B. If the boom is stirred at the moment when the suspended load is landed in such a working posture, the wire rope 3 will loosen and fly out from the guide pulley 1, causing the inconvenience that the work cannot be continued unless it is re-tied.

On the other hand, in this type of crane, when the additional boom B is not in use, the wire rope 3 for the secondary hook 5 is connected to the folding guide tool 6 on the boom A as shown in FIG.
When the additional boom is rotated to the front of the boom A as shown in Figure 7 and attached to the use state, the wire rope 3 is also shown in Figure 8. It is necessary to pass it over the guide pulley 1 like this. Further, when storing the additional boom B from this state of use, the wire rope 3 must be removed from the guide pulley 1.

Therefore, it is desirable that the wire rope 3 never come off the guide pulley 1 during work with the replenishing boom B, and that it can be removed very easily at the beginning and end of the work.

(Prior art) On the other hand, the conventional technology was not able to satisfy both requirements, and either did not have a locking function at all, or if it did have this function, it was not possible to satisfy both requirements. Since the wire rope 3 was twisted, it was necessary for the worker to climb to a high place on the boom B to attach and detach the pin at the beginning and end of the work, making it troublesome and dangerous to attach and detach the wire rope 3. .

(Purpose of the invention) Therefore, the present invention has been devised to provide a wire rope fly-out prevention device that completely performs the function of preventing wire rope from coming off during work, and which allows for extremely easy and safe hanging and unhooking from the ground at the beginning and end of work. This is what we provide.

(Structure of the invention) The present invention, as a means to solve the problems of the prior art, attaches an additional boom to the boom head at the tip of the boom in a removable manner, and uses a wire for a secondary hook suspended from the additional boom. A device for preventing the wire rope from jumping out of a crane in which a guide pulley for guiding the rope is attached to the boom head; A tube fixedly arranged on the boom head on the side of the guide pulley so that its axis is along the vertical direction; It is formed in an L-shape, and one leg thereof can take a regulating position directly above the guide pulley and perpendicular to the pulley groove of the guide pulley, and a release position retracting from above the pulley groove of the guide pulley. a regulating member, the other leg of which is rotatably supported by the tube; a regulating member that is interposed between the tube and the regulating member and presses the regulating member upwardly against the tube; A spring is provided between the other leg of the regulating member and the tube at an appropriate position, and when the one leg of the regulating member is in the regulating position, the spring biases the regulating member upwardly to engage the regulating member. a fixing device for regulating rotation of the regulating member; and configured such that the other leg of the regulating member extending from the lower end of the cylinder can be pulled down and rotated from below via a handle. It is characterized by:

(Function) With this configuration, by engaging the handle at the lower part of the regulating member, pulling down the handle, and then rotating the regulating member, the regulating member can be moved to the regulating position perpendicular to the pulley groove directly above the guide pulley and the guide pulley. The release position retracted from above the groove can be easily and reliably selected. Furthermore, since this operation can be performed using a handle, it can be operated safely on the ground.

(Embodiment) An embodiment of the present invention will be explained with reference to FIGS. 1 to 4. A is a crane boom whose base is pivotally supported on a swivel base on a carrier (not shown), and a luffing cylinder device (not shown) is interposed between the crane boom at a suitable location and the swivel base, so that it can be freely swiveled and raised. ing. In addition, the boom A itself is configured to be extendable and retractable, and includes an outer cylinder A1, a middle cylinder A2, and an inner cylinder A.
3, and a telescopic cylinder device (not shown) is built in between each cylinder. At the tip of the inner cylinder A3 are guide pulleys 1 and 2 and a fixed pulley for hanging the hook (not shown).
A boom head A4 is installed. Reference numeral B denotes a supplementary boom, which is attached to the boom head A4 as appropriate to compensate for the lack of reach of the crane boom A (as shown in Figure 1), and is used by being stored and locked on the side wall of the outer cylinder A1 when not in use. It is. A wire rope 3 is let out by a winch device (not shown) mounted near the base of the crane boom A, guided by a guide pulley 1 as shown, and suspended from a pulley 4 at the tip of the supplementary boom B. 5 is an auxiliary hook attached to the end of the wire rope.

Even with this configuration, the rotation operation of the rotation base,
Combining crane boom extension and retraction operations with hoisting operations,
Moreover, when the winch device is wound up and unwinded, the wire rope 3 moves the hook 5 (load) up and down via the guide pulley 1 and the pulley 4, and the lifting boom B can perform load lifting work. Furthermore, when the supplementary boom B is not in use, it is stored and locked on the side wall of the outer cylinder A1 as described above, and the wire rope 3 in this state is attached to the side wall of the outer cylinder A1.
The end of the cable is guided to the base of the crane boom A via a folding guide 6 provided on the upper surface and is latched at an appropriate location. (The state in which the wire rope 3 is shown by the two-dot chain line in FIG. 1).

Now, in the crane used as described above, in order to prevent the wire rope 3 from jumping out, a restrictor 7 is attached to the boom head A4 on the side of the guide pulley 1. FIG. 2 shows details of the restrictor 7.

In the figure, A4 is the side wall of the boom head, 11 is the pulley groove of the guide pulley, and 12 is the rim. The regulating member 7 includes a regulating member 71 formed in a substantially L-shape, and a regulating member 7.
A flange 73 provided on the rotating shaft 72 of 1, and a regulation position selection rod 7 planted below the rotating shaft 72 so as to be perpendicular to the axial direction.
4. Handle insertion hole 7 drilled at the lower end of the rotation shaft 72
Consists of 5. Reference numeral 79 is a cylinder fixedly arranged on the boom head on the side of the guide pulley so that its axis is along the vertical direction, into which the rotating shaft 72 and collar 73 are inserted, and a spring seat 76 is provided at the lower part of the cylinder. This spring seat 7
A spring 77 is interposed between the flange 73 and the flange 73, and biases and presses the regulating member upward against the cylinder. Further, V grooves 78 are cut in the lower end of the cylinder 75 at appropriate intervals. By selecting the fitting position of the restriction position selection rod 74 with respect to this V groove 78, the restriction member 71 is placed in the restriction position directly above the guide pulley 1 and perpendicular to the pulley groove 11 (rim 12). It is possible to select a release position retracted from above the groove. Note that the restriction position selection rod 74 and the V-groove 78 constitute a fixing device.

During the work, as shown in FIG. 2, the regulating member 71 is placed in a regulating position directly above the pulley groove 11 (rim 12) and perpendicular to it. Since the restricting position selection rod 74 is fitted into the V-groove 78 at this position by the elastic force of the spring 77, it is restrained at this position unless it is manually released. Therefore, in this state, the wire rope does not jump out beyond the regulating member 71. Also, at the beginning and end of the work, as shown in FIG.
Since the fitting between the V groove 78 and the V groove 78 is released, the regulating member 71 can be rotated in any direction other than the regulating position by turning the handle 8. Further, the restriction position selection rod 74 can be fitted into an appropriate V-groove 78 and restrained at the release position, so that in this position the wire rope 3 can be easily hooked on and removed without being obstructed by the restriction member 71. (Figure 4).

(Effects of the invention) According to the invention, the wire rope can be completely prevented from flying out during work, the wire rope can be easily hung and unhooked at the beginning and end of the work, and the wire rope can be regulated by using a handle of an appropriate length. Since the tools can be operated from the ground, safe work is possible and extremely convenient.

[Brief explanation of the drawing]

Fig. 1 is an external view of the embodiment of the present invention, Fig. 2 is a cross-sectional view of the main parts, Fig. 3 is an external view of the main parts, Fig. 4 is a diagram showing the wire rope hanging and unhooking operation according to the present invention, Fig. 5 The figure is an explanatory diagram of the crane operation to show the problem to be solved by the present invention, Figures 6 and 7 are explanatory diagrams of the retracting boom and the installation operation, and Figure 8 is the operation of hanging the wire rope 3 on the guide pulley 1. FIG. A...Boom, B...Additional boom, 1...Guide pulley, 3...Wire rope, 5...Secondary hook,
7...Regulation tool, 71...Regulation member, 8...Handle.

Claims (1)

[Scope of Claim for Utility Model Registration] A wire in a crane in which a supplementary boom is detachably attached to a boom head at the tip of the boom, and a guide pulley is attached to the boom head to guide a wire rope for a secondary hook suspended from the supplementary boom. A device for preventing the rope from jumping out; A tube fixedly disposed on the boom head on the side of the guide pulley so that its axis is along the vertical direction; The other leg is rotated by the tube so that it can take a restricted position that is perpendicular to the pulley groove of the guide pulley directly above the pulley and a released position that is retracted from above the pulley groove of the guide pulley. a movably supported regulating member; a spring interposed between the tube and the regulating member to bias and press the regulating member upward against the tube; and a spring disposed between the other leg of the regulating member and an appropriate position of the tube. a fixing device that is provided in the regulation member and engages with the regulation member by biasing the regulation member upwardly by the spring to regulate rotation of the regulation member when the one leg of the regulation member is in the regulation position; A wire rope jumping-out prevention device for a crane, characterized in that the other leg of the regulating member extending from the lower end of the tube can be pulled down and rotated from below via a handle.