JPH0453795B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a container spreader used by being attached to a lift mechanism part of a forklift truck or the like.

[Conventional technology]

Spretzers are used as attachments for lifting containers and the like with forklift trucks. In such a container spreader,
A twist lock pin, which is rotatably supported by a twist lock beam around its axis, is inserted into an engagement hole formed in the ceiling of the container, and the twist lock pin is rotated within the engagement hole to engage the lock. By engaging with the matching hole, it is possible to fish out the container.

An exploded perspective view of an example of a twist lock beam of a conventional container spreader is shown in FIG. 3, a plan view of the main part thereof in FIG. 4, and a sectional view in FIG. 5.
A hollow twist lock pin holder 26 is provided in two twist lock boxes 27 formed integrally with the twist lock beam and spaced apart from each other.

A shaft having a twist lock pin 28 at its lower end is inserted into a hollow hole of a twist lock pin holder 26, and a twist lock arm 23 is attached to its upper end.

Two twist lock arms 23 are connected to each other by a pin 24 and a twist lock rod 22, and one twist lock arm 23 is connected to a twist lock cylinder 21.

The rear end of the twist lock cylinder 21 is pivotally supported by a twist lock beam, and the rod is moved back and forth by hydraulic pressure to directly connect the left twist lock arm 23 and, via the twist lock rod 22, to the right side. Twist lock arm 2
3 through an angle of about 90 degrees each to engage the twist lock pin 28 into the engagement hole of the container.

[Problem that the invention seeks to solve]

As mentioned above, the conventional twist lock device for a container spreader has an extremely large number of parts as shown in FIG. 3, and as a result, there are many parts that are subject to mechanical wear during operation of the twist lock device. Furthermore, because there are many worn parts, there are also many nipples for lubricating, and the locations where they are installed are extremely difficult to lubricate.

In view of these points, the present invention reduces the number of component parts, simplifies the operating mechanism, and reduces the wear parts, thereby reducing the overall weight of the container spreader and making its maintenance easier. The purpose is to

[Means for solving problems]

In the present invention, the above-mentioned object is achieved by a rotary shaft made of a hollow shaft equipped with a pressure receiving vane, and the rotary shaft is rotatably provided in the center of a cylinder chamber surrounded by an arcuate wall surface. , a hydraulic oil supply/drain port is open in the cylinder chamber, a spline is formed in the hollow part of the rotary shaft, a shaft is spline-coupled to the spline of the rotary shaft, and the shaft is connected to the spline of the rotary shaft. This is achieved by a hydraulic cylinder for a container spreader, which is characterized in that a twist lock pin of the container spreader is attached.

[Effect]

In the present invention, each twist lock box is provided with a torque cylinder that rotates the rod using hydraulic pressure. Therefore, there is no need to mechanically connect both twist lock pins, and the number of parts can be significantly reduced, and the weight of the twist lock beam can be reduced.

Furthermore, since the number of worn parts is reduced due to the reduction in the number of parts, the number of grease nipples is also reduced, making maintenance easier.

Furthermore, in the present invention, the rotating shaft of the torque cylinder is a hollow shaft, and a spline is formed in the hollow part of the rotating shaft, and a spline is formed in the shaft connected to the twist lock pin, so that the hollow shaft of the torque cylinder and the spline are formed in the hollow part of the rotating shaft. The axis of the twist lock pin is directly spline-coupled, making the device more compact, and the axis of the twist lock pin is supported by upper and lower bearings that rotatably support the rotating axis of the torque cylinder. The vertical spacing of the lock pin shaft support bearing can be made sufficiently large, and the thrust pressure acting on the twist lock pin can be
Has sufficient resistance.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to Examples. FIG. 1 is a sectional view of a main part of a hydraulic cylinder for a container spreader according to the present invention, and FIG.
FIG.

A cylinder for a container spreader according to the present invention is fastened to each twist lock box portion of the twist lock beam 2 by bolts 3.

The cylinder for the container spreader includes upper and lower bottom plates 4a, 4b, a cylindrical body 5 having an arcuate wall surface 5g (see FIG. 2), and the bottom plates 4a, 4b and the cylindrical body 5.
Consisting of seal plates 7a and 7b provided between the
They are tightly fastened with bolts 15 to form a cylinder chamber inside.

The cylinder chamber of this embodiment consists of two chambers divided symmetrically around the central axis by partition walls 5e and 5f as shown in FIG.
It may be more than one room.

Projections 5a, 5b, 5c, and 5d protruding into the cylinder chamber from the arcuate mural 5g act as stoppers that restrict the swing range of pressure receiving vanes 12b and 12c, which will be described later.

The hollow shaft 11 with a circular cross section has an outer diameter that gradually increases from the bottom to the top, with the shoulder as the boundary.
The shoulder portion of the hollow shaft 11 is rotatably supported by bearings 9 and 10 installed on the bottom plates 4a and 4b, and an oil seal 16 is mounted on the outside of each bearing 9 and 10 in the axial direction.

A spline 11a is formed on the outer periphery of the portion of the hollow shaft 11 facing the cylinder chamber.

Plate-shaped pressure receiving vanes 12b and 12c extending in the radial direction are formed on the circumferential surface of the cylinder, and a spline 12a is formed on the inner circumference to form the outer shell 12.

The splines 12a of the outer shell 12 are engaged with the splines 11a of the hollow shaft 11, and the outer shell 12
and the hollow shaft 11 rotate together around the central axis.

The lengths of the pressure receiving vanes 12b and 12c are set so that their tips are liquid-tightly fitted into the arcuate inner wall surface 5g of the cylinder chamber. Moreover, the pressure receiving vane 12b,
The width of 12c is set so as to fit in the seal plates 7a, 7b in a liquid-tight manner.

The pressure receiving vanes 12b and 12c are respectively mounted between the protrusions 5a and 5b and between the protrusions 5c and 5d protruding into the cylinder chamber, and are rotatable therebetween.

Inside the cylinder chamber are pressure receiving vanes 12b and 12c.
The pressure receiving vane 12
The circumferentially outer side of the swing range of b and 12c, that is,
Hydraulic oil supply/drain ports 4c, 4d are opened outside the projections 5a, 5b, 5c, 5d. Each oil supply/drainage port 4c, 4d communicates with a hydraulic oil supply source (not shown) via nipples 14a, 14b.

Supply hydraulic oil from the oil supply and drainage port 4c,
When the hydraulic oil is discharged from d, the pressure receiving vane 1
2b and 12c rotate in the direction shown by the arrow in FIG. When the supply and discharge of hydraulic oil are reversed, the pressure receiving vanes 12b and 12c rotate in the opposite direction to the above-mentioned direction. The hollow shaft 1 along with the pressure receiving vanes 12b and 12c
1 rotates, and this rotation of the hollow shaft 11 is extracted to the twist lock pin 28 in the following manner. That is, the spline 11b is formed in the hollow part of the hollow shaft 11.
At the same time, a spline 6b is formed on the shaft 6 connected to the twist lock pin 28, and both splines 11b and 6b are engaged so that the hollow shaft 11 and the shaft 6 rotate integrally. axis 1
Some relative movement in the axial direction between the shaft 1 and the shaft 6 is allowed.

A grooved nut 8 is screwed onto a screw 6c formed on the head of the shaft 6, and a pin 13 is inserted into the groove of the grooved nut 8 to fix the grooved nut 8 in a predetermined position.
The amount of downward movement of is regulated. Further, a shoulder portion 6aa of a cylindrical portion 6a formed on the shaft 6 engages with the twist lock beam 2, thereby regulating the amount of upward movement of the shaft 6.

In the container spreader hydraulic cylinder having the above configuration, the twist pin 28 attached to the tip of the shaft 6 is inserted into an engagement hole (not shown) formed in the ceiling of the container, and oil is supplied and drained. Hydraulic oil is supplied from the port 4c, and hydraulic oil is discharged from the oil supply/drainage port 4d, and the pressure receiving vanes 12b, 12c are rotated in the direction shown by the arrow in FIG. Pressure receiving vanes 12b, 12
The rotation of c is transmitted from the hollow shaft 12 through the splined shaft 6 to the twist lock pin 28, which rotates within the engagement hole of the container and engages with the engagement hole. Therefore, containers can be fished out.

When releasing the container from the twist lock pin 28, the supply and discharge of hydraulic oil is reversed to the above-mentioned direction, and the pressure receiving vanes 12b and 12c rotate in the opposite direction to the above-mentioned direction, and the twist lock pin 28 is inserted into the engagement hole. come off from

〔Effect of the invention〕

In the present invention, each twist lock box is provided with a torque cylinder that rotates the rod using hydraulic pressure. Therefore, there is no need to mechanically connect both twist lock pins, and the number of parts can be significantly reduced, and the weight of the twist lock beam can be reduced. Conversely, if the twist lock beam is made to have the same weight as the conventional one, the rigidity of the twist lock beam can be further increased.

Furthermore, since the number of worn parts is reduced due to the reduction in the number of parts, the number of grease nipples is also reduced, making maintenance easier.

Furthermore, in the present invention, the rotating shaft of the torque cylinder is a hollow shaft, and a spline is formed in the hollow part of the rotating shaft, and a spline is formed in the shaft connected to the twist lock pin, so that the hollow shaft of the torque cylinder and the spline are formed in the hollow part of the rotating shaft. The axis of the twist lock pin is directly spline-coupled, making the device more compact, and the axis of the twist lock pin is supported by upper and lower bearings that rotatably support the rotating axis of the torque cylinder. The vertical spacing of the lock pin shaft support bearing can be made sufficiently large, and the thrust pressure acting on the twist lock pin can be
Has sufficient resistance.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a container spreader according to the present invention, FIG. 2 is a cross-sectional view along the line shown in FIG. 1, and FIG. 3 is an exploded perspective view of an example of a twist lock beam of a conventional container spreader. 4 is a plan view of the main part of FIG. 3, and FIG. 5 is a sectional view of FIG. 4. 4c, 4d...Hydraulic oil supply/drain port, 5g...Circular wall surface, 6...Shaft, 11...Hollow shaft, 12a, 12b...
Pressure receiving vane, 28...twist lock pin.

Claims (1)

[Claims] 1 A rotary shaft consisting of a hollow shaft is equipped with a pressure receiving vane, the rotary shaft is rotatably provided in the center of a cylinder chamber surrounded by an arc-shaped wall surface, and the cylinder chamber is supplied with hydraulic oil. The oil drain port is open, a spline is formed in the hollow part of the rotating shaft, the shaft is spline-coupled to the spline of the rotating shaft, and the twist lock pin of the container spreader is attached to the shaft. A hydraulic cylinder for a container spreader.