JPH0246520B2 - - Google Patents

Description

[Detailed Description of the Invention] The invention of the present application is equipped at the end of a lift truck for loading and unloading various types of cargo into and out of a ship's hold, freight cars, containers, transport trucks, etc., while leaving the unit intact when entering and leaving the warehouse. More specifically, the present invention relates to a pantograph mechanism that extends and retracts a face plate provided on the front surface of the load push-pull in the front and rear directions.

Normally, the face plate of a load/push pull is attached to the tip of the lift truck via a pantograph, but due to defects in the shape and structure of the pantograph, some parts of the face plate may be pushed strongly forward, or the entire pantograph may be There were drawbacks such as eccentricity to one side and the inability to push the load forward with an even force, causing the load to collapse or damage the load.

In order to solve these drawbacks, the present invention provides two sets of arms that intersect each other in the same plane, and the distal end of one set and the proximal end of the other set are respectively pivotally connected. 12, 13 and 1
4 and 15, and a hydraulic cylinder 16 for extending and retracting the arm assembly in the front and back direction, the arm assembly includes:
It is formed as a rectangular steel frame unit perpendicular to the plane in side view, and the intersection of the arms corresponding to the upper and lower sides provided in pairs is connected to the pin 1.
The tips of the arms of one set and the base ends of the other set of arms, which form an upper and lower pair, are pivotally connected by pins 26 and 27, respectively, and the upper and lower pairs are The proximal ends of the arms of one pair of arms are slidably accommodated in guide rails 9 and 9' provided at the upper and lower parts of the back plate 8, respectively, and The tips of the arms of the pair of arms are slidably accommodated in guide rails 11 provided at the upper and lower parts of the face plate 5, respectively, and the link rods 18 and 25 are arranged between the arms 12 and the back plate 8. , are pivotally mounted between the arm 14 and the face plate 5, and the hydraulic cylinder 16 has its base end pivoted to the inner base of the arm 12, and the piston rod 20
A pantograph mechanism is provided in which the tip of the pantograph is pivotally connected to the arm 13 via a bracket.

Hereinafter, the present invention will be explained in detail based on Examples.

1 and 2 show a load/push-pull lift truck A showing an embodiment of the present invention. A vertical mast 2 is tiltably attached to the front end of the lift truck 1, and a mount 3 is mounted on the mast. Two platens 4, 4 are attached to the lower end of the pedestal 3 so as to move vertically. Load·
The push pull B is attached to this pedestal 3 and moves vertically on the pedestal, and is connected to the face plate 5 attached to the tip so as to extend and retreat in the front and rear directions via an extendable pantograph structure 6. ing.

The pantograph structure 6 has proximal ends 7, 7' slidably accommodated in guide rails 9, 9' of the back plate 8, and distal ends 10, 10' accommodated in the face plate 5.
A pair of upper and lower arm assemblies which are slidably housed in a guide rail 11 provided on the back side of the machine are pivotally connected to be extendable and retractable, and are extended and retracted back and forth using a hydraulic cylinder 16.

The pantograph structure 6 includes two sets of arms 12 and 13, which are configured by intersecting each other in the same plane and pivoting the distal end of one set and the base end of the other set, and an arm 14. , 15 are arranged in an upper and lower pair. The paired arm assemblies are pivotally connected at the intersections of the upper and lower arms by pins 17 and 24, respectively, and in order to increase rigidity and prevent sideways swinging, the arm assemblies are It forms a rectangular steel frame unit perpendicular to the plane containing the solid (see Figure 3). The upper and lower base ends 7, 7' of the arms 12 and 13 are slidably accommodated in guide rails 9, 9' provided at the upper and lower parts of the back plate 8, respectively, while the upper and lower base ends 7, 7' of the arms 14 and 15 are slidably accommodated in guide rails 9, 9' provided at the upper and lower parts of the back plate 8, respectively. The upper and lower end portions 10, 10' are slidably accommodated in guide rails 11 provided at the upper and lower portions of the face plate 5, respectively (see FIGS. 3 and 4). Further, as can be seen from FIG. 4, the upper and lower ends of arms 12 and 13 and the arm 1
The upper and lower base end portions of 5 and 14 are pivotally connected with pins 26 and 27, respectively. A link rod 18 is pivotally connected between the arm 12 and the back plate 8, and the base end of the hydraulic cylinder 16 is pivotally connected to the inner base 19 of the arm 12.
0 is pivotally connected with a pin 23 between brackets 21 and 22 protruding from the inner boss portion of the arm 13, so that the intersection of the arms 12 and 13 is pushed forward. Further, the arm 14 is pivotally connected to a part of the face plate 5 via a link rod 25.

Next, hydraulic cylinders 28 and 29 are attached to both sides of the face plate 5, and the face gripper 30 is moved up and down by the hydraulic cylinders, so that a mat such as a sheet can be gripped between it and the lower jaw member 31. This lower jaw member 31 is fixed to the lower guide rail 11 and the face
It is tilted back and forth together with the plate 5.
That is, a guide plate 32 as shown in FIG. 7 is provided inside the lower guide rail 11 so that the sliding bearings 33, 33 at the lower ends of the arms 14 and 15 slide along the guide plate 32. and 15
When fully extended forward, the smooth nut part 3
3 and 33 slide toward the center along the guide plates 32 and 32. At this time, the sliding bearings 33, 33 try to be pushed back toward you by the guide plates 32, 32, but due to the reaction at this time, the guide rail 1
The face plate 5 is tilted backward in order to push 1 forward. The upper part of the face plate 5 is supported by a spherical bearing 34, and when the lower end of the face plate 5 is pushed out as described above, the upper part is tilted rearward by the spherical bearing 34. In the figure, 35 is a second gripper, which is installed in order to hold down the seat etc. and push only the luggage forward with the face plate 5, and hydraulic cylinders 36, 37.
It is moved up and down together with the guide rails 9, 9'.

The present invention is constructed as described above, and when the face plate 5 is to be extended forward, the hydraulic cylinder 16 is actuated to project the piston rod 20 and the intersection of the arms 12 and 13 is moved forward. When pressed, the link rod 18 rotates clockwise, causing the base ends of the arms 12 and 13 to slide toward each other within the guide rails 9 and 9'.
Along with this sliding movement, the tips of the arms 12 and 13 also pivot around the pin 17 in a direction in which they approach each other, and at the same time the base ends of the arms 14 and 15 pivot in a direction in which they approach each other. Therefore, the tips 10' and 10 of the arms 14 and 15 also slide toward each other within the guide rails 11 and 11', making the arms 12, 13, 14, and 15 almost linear. Extend and push the face plate 5 forward. At this time, as shown above, the arm 14
The lower portion 10' of the tip of the face plate 5 slides toward the center along the guide plates 32, 32 as shown in FIG. Tilt to tilt.

That is, even if the gripper 30 is tilted forward to make it easier for the face gripper 30 to grip the underlay sheet of the load, the upper part of the face plate 5 is tilted backward, so the face plate 5 will not touch the top of the load and the load will be removed. There is no damage to it at all.

As described above, in the pantograph structure 6 of the present invention, the upper and lower arm assemblies formed by the arms 12, 13, 14, and 15 respectively move left and right inside the guide rails 9, 9', and 11. arms 14 and 1 by sliding an equal distance to
The face plate 5 attached to the tip of the arm 12 extends straight, and the sliding distance of the arm 12 is adjusted by the length and rotation angle of the link rod 18. Since the sliding distance of the arm 14 is adjusted by adjusting the sliding distance of the arm 14,
2, 13, 14, 15 are these link rods 18 and 2
5, the link rod 18 always operates stably. That is, when the piston rod 20 of the hydraulic cylinder 16 is pushed forward, the link rod 18 begins to rotate counterclockwise, but when it rotates to a position perpendicular to the axis of the arm 12, the link The rod 18 can no longer rotate, the base end of the arm 12 stops sliding, and the distal end of the arm 15, which is pivotally connected to the arm 12, also stops sliding. At this time, the arm 13 is also stopped by the link rod 25 which is pivotally connected to the arm 14 connected to the arm 13, so the arms 12, 1
Numerals 3, 14, and 15 allow the face plate 5 to extend straight without eccentricity.

When retracting the face plate 5, the piston rod 20 of the hydraulic cylinder 16 is retracted and the arms 12, 13, 14, 15 are moved as shown in FIG. 6 while rotating the link rods 18 and 25 clockwise. Fold into.

As described above, according to the present invention, the face plate is attached to the end of the lift truck, and the face plate is made to be able to extend straight through the pantograph structure, and the face plate is Since it is formed so that it can be tilted backwards, the entire load can be pressed against the face plate and pushed out straight, so there is no loss of load or damage to the load.

[Brief explanation of drawings]

1 and 2 are a side view and a plan view, respectively, of a lift truck with a load push pull according to the present invention, FIG. 3 is a side view of the load push pull, and FIG.
5 is a plan view of the pantograph, FIG. 5 is a rear view of FIG. 4, FIG. 6 is a plan view of the pantograph in a retracted state, and FIG. 7 is a sectional view taken along the line -- of FIG. 3. In the diagram, 1: lift truck, 2: mast,
4: Platen, 5: Face plate, 6: Pantograph structure, 9, 9', 11, 11': Guide rail, 12, 13, 14, 15: Arm, 1
6: Hydraulic cylinder, 17: Pin, 18: Link, 24: Pin, 25: Link, 26, 27: Pin, 32: Guide plate, A: Lift truck with load/push-pull, B: Load/push-pull.

Claims (1)

[Scope of Claims] 1. Two sets of arms 12 and 13 configured by intersecting each other in the same plane and pivoting the distal end of one set and the base end of the other set, and 1
4 and 15, and a hydraulic cylinder 16 for extending and retracting the arm assembly in the front and back direction. It is formed as a rectangular steel frame unit perpendicular to the
The intersecting parts of the arms, which are provided as an upper and lower pair and correspond to the upper and lower sides, are pivoted by pins 17 and 24, respectively, and the tips of the arms of the one set of the upper and lower pairs and the arms of the other set The proximal end of
They are pivotally connected by pins 26 and 27, and the base ends of one of the upper and lower pairs of arms can slide into guide rails 9 and 9' provided at the upper and lower parts of the back plate 8. The tips of the other pair of arms of the upper and lower pairs are slidably accommodated in guide rails 11 provided at the upper and lower parts of the face plate 5, respectively,
Link rods 18 and 25 are pivotally mounted between the arm 12 and the back plate 8 and between the arm 14 and the face plate 5, respectively, and the hydraulic cylinder 16 has a base end located at the inner base of the arm 12. A pantograph mechanism characterized in that the tip of a piston rod 20 is pivotally connected to an arm 13 via a bracket.