JPS6132952Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a rail clamp used to prevent a crane from running away.

Conventional rail clamps of this type use a link mechanism to increase the force of a weight or a spring, grip the rail with clamp claws, and release the clamp by lifting the weight using the force of a hydraulic cylinder or electric-hydraulic motor. was. As a result, as the gripping force increases, the weight and spring become bulky, and maintenance and inspection become troublesome.

The rail clamp according to the present invention includes a support frame that is held movably in the traveling direction on the crane body, and is rotatably supported on the support frame so as to be located on both sides of the crane traveling rail, and each of which supports the side head of the rail. Four clamp shafts with eccentric cam-shaped clamp claws for tightening, a spring for applying the clamping force interposed between these left and right clamp shafts, and forcing the left and right clamp shafts to release against the force of the springs. The present invention is characterized by comprising a driving means for applying force to the clamp shaft, and a link plate connected to the left and right sides of the rail so as to extend from the crane body along the rail so as to transmit a turning force to the clamp shaft. The present invention aims to provide a rail clamp that can exert a large gripping force with a simple mechanism and eliminates the drawbacks of the conventional rail clamp.

The present invention is constructed as described above, and includes clamp claws attached to the four clamp shafts, the spring, a drive means for operating the clamp shafts, and two clamp shafts arranged along the crane travel rail among the four clamp shafts. The clamp pawl has a self-locking function due to its organic working relationship with the link plate that drives and connects the rail, and when the crane tries to escape, the clamp pawl strongly clamps to the side head of the rail, which prevents the crane from escaping. It can be quickly prevented with a small amount of force.

Next, the present invention will be described with reference to illustrated embodiments.

In the figure, the mounting portion 7 has a shaft 11 connected to a bracket 10 on the crane body on one side, and a device described below is connected on the opposite side.

Reference numeral 12 denotes a board whose one end is connected to an eyepiece 14 having a long hole 13 in the center of the mounting part 7 so as to have some play in the crane traveling direction (rail longitudinal direction), and whose other end is placed on a rail 15 via wheels 6. It is a support frame of the shape. The support frame 12 may be in the form of a skeleton, or may be held so that both ends are axially connected to a portion extending from the crane body to near the rails through elongated holes.

Reference numerals 16a to 16d designate four clamp shafts which are respectively positioned on the left and right sides of the rail 15 at intervals in the longitudinal direction of the rail 15 and are rotatably supported by the support frame 12. Each clamp shaft has a rail side head at the lower end. It has an eccentric cam-shaped clamp claw 1 for tightening.

Between each pair of clamp shafts 16a and 16b and 16c and 16d facing each other with the rail 15 in between, two pairs of clamp shafts 16a and 16a are spaced apart in the longitudinal direction of the rail.
6b, 16c, and 16d are connected at both left and right ends in FIG.
energizes a turning force that presses the claws 1 of the pair of clamp shafts against the rail 15 with the tensile force.

The T-type link plate 3 connects the two clamp shafts 16a, 16b and 16c, 16d at opposing positions across the rail, and the hydraulic cylinder 2 for clamp release connects the two T-type link plates 3, 3 is connected in the longitudinal direction of the rail, and when the crane is in operation, this cylinder 2 is energized by an extension drive to rotate each clamp shaft in a direction that resists the tensile force of the spring 17, and the spring 17 is connected. The clamp claw 1 is kept in a position where it touches the stopper 8 on the support frame 12, and the clamp claw 1 is separated from the side surface of the rail 15 to maintain the clamp released state.

The hydraulic cylinders 2 may be provided separately for each left and right set (of the clamp shafts) in FIG. 1, or may be replaced by other driving means.

When the crane is stopped, the hydraulic cylinder 2 is placed under no load, so that the tensile force of the spring 4 causes the pawl 1 of each clamp shaft to be pressed against the side surface of the rail.

The link plate 5 extends along the rail on the left and right sides of the rail 15, and has one end connected to the connecting portion 7.
The intermediate portion and the other end portion are connected via long holes 19 to levers 20 of two clamp shafts lined up along the rail and shafts 21. This play due to the elongated hole 19 occurs when the link plate 5 moves relative to the clamp shaft in the longitudinal direction of the rail, for example, when moving relative to the right in FIG.
A force is applied to one pair of clamp shafts 16c, 16d to clamp them more strongly, while the other pair of clamp shafts 16a, 16b is provided with a relationship that does not cause the pair of clamp shafts to clamp in the same direction, that is, to prevent the other pair of clamp shafts from unclamping. establish.

The elongated holes 19 may be ordinary connecting holes with no play. In that case, when one pair strongly clamps the rail, the clamping force of the other pair will be weakened, but this is not a problem. Must not be.

Note that 9 in the figure is a hydraulic unit.

In this embodiment configured in this way, when the crane or the like is moving, the hydraulic cylinder 2 is
Move the mold link 3 from position A to position B until the protrusion attached to the clamp claw 1 touches the stopper 8.
At this time, a slight gap is created between the eccentric cam-shaped clamp claw 1 and the rail 15, so that the crane can travel without resistance from the clamp. When the crane is stopped and performing predetermined cargo handling work, the hydraulic pressure of the hydraulic cylinder 2 is removed to create an unloaded state. Then, the T-shaped link 3 moves from B to position A by the spring 4, and at this time, the rail 15 is attached to the clamp claw 1.
An initial clamping force is generated to grip the

Furthermore, when the crane tries to move due to wind blowing, the force is transmitted to the clamp claw 1 by the link 5, but at this time, the clamp claw 1 moves in the direction of gripping the rail 15 more and more firmly, thereby firmly grasping the rail 15. 15 can be clamped. In addition, the first
Although the figure and FIG. 2 show the case where four clamp shafts 16a, 16b, 16c, and 16d are provided on one support frame, two support frames are connected at the front and rear of the crane body, and each support frame is It is also possible to provide two clamp shafts in each case.

As is clear from the detailed description above, in this embodiment, a large weight is used to generate a large clamping force.
Compared to conventional systems that required large springs, the clamping force can be changed to the crane's escape force itself, making it easier to reduce the weight of the clamping device. This can be prevented quickly and reliably.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway and omitted plan view of an embodiment of the present invention, Fig. 2 is a partially cutaway side view, and Fig. 3 is a partially enlarged view of the part in Fig. 2. 4 is a left end view of FIG. 2, and FIG. 5 is a sectional view taken along the line of FIG. 1. 1... Clamp claw, 2... Hydraulic cylinder, 3...
...T-type link plate, 4... Spring, 5...
...Link plate, 16a, 16b, 16c, 1
6d... Clamp shaft, 10... Crane body, 1
2...Support frame, 15...Rail.

Claims (1)

[Scope of utility model registration request] A support frame is held on the crane body so as to be freely movable in the traveling direction, and eccentric cam-shaped clamps are rotatably supported on the support frame so as to be located on both sides of the crane travel rail, and each clamp is used to tighten the side head of the rail. four clamp shafts having claws, a spring for applying a clamp force interposed between these left and right clamp shafts, a driving means for urging the left and right clamp shafts to release against the force of the springs, and a drive means for urging the left and right clamp shafts to release against the force of the springs; A rail clamp characterized by comprising link plates connected on both left and right sides so as to extend along the rail from the crane body and to transmit a turning force to the clamp shaft.