JPH0722319Y2 - Horizontal heavy lifting device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting and lowering device for heavy objects such as a press.

[0002]

2. Description of the Related Art Conventionally, a lifting device of this type has a lower end base of one arm of a pair of lifting arms pivotally supported in a lateral direction, which is pivotally supported on a base frame, and is mounted on an upper end thereof. A rolling wheel is movably mounted on a rail-shaped lifting frame on a heavy object, the upper end of the other lifting arm is pivotally supported on the lifting frame, and the rolling wheel mounted on the lower end is moved to the base frame. It freely rides, the end of the telescopic arm of the advancing and retracting cylinder is pivotally supported on the other lifting arm, and the telescopic arm is expanded and contracted to expand and contract the pair of elevating frames in a pantograph manner to lift heavy objects The above-described heavy object lifting device is used.

[0003]

SUMMARY OF THE INVENTION In the conventional pantograph-type lifting device, the telescopic arm of the advancing / retreating cylinder requires an excessive starting force when the telescopic arm of the one pair rises, and The telescopic arm can only be folded to the limit thickness. The present invention has been proposed in view of the above problems of the prior art. The purpose of the present invention is to reduce the starting force at the start of lifting of the lifting device, and to lower the lifting device so that it can be folded horizontally. The point is to provide a lifting device.

[0004]

In order to achieve the above object, a horizontal heavy object lifting device according to the present invention comprises a pair of telescopic arms having one lower end pivotally supported by a base frame. A rolling wheel mounted on a horizontal connecting shaft is rotatably mounted on a horizontal elevating frame mounted on a heavy object, and the pair of telescopic arms and the other pair of telescopic arms pivotally mounted in a groin shape. In the pantograph type lifting device, the upper end of which is pivotally supported on the lifting frame, and the rolling wheel axially mounted on a horizontal connecting shaft that connects the lower ends is rotatably mounted on the base frame, A cam arm is mounted on a lower horizontal connecting shaft on which the rolling wheels of the other telescopic arm are mounted, and the lower end edge of the one arm is rotatably supported by a roller mounted on the cam arm. In the eccentric position,
The cylinder arm of the advancing / retreating cylinder mounted on the base frame is pivotally supported.

[0005]

Since the present invention is constructed as described above,
By retracting the telescopic arm of the advancing / retreating cylinder, the cam arm pivotally supported on the horizontal connecting shaft of the other telescopic arm pivotally supported on the tip of the arm pivots upward, and the cam arm pivotally pivots on the cam arm. As a result, a lifting force is applied to one of the pair of lifting arms, the same lifting arm rises up lightly, the other pair of lifting arms rises up accordingly, and the wheels of each pair of lifting arms are respectively raised to the base frame. The horizontal heavy object is easily lifted horizontally by moving along the ascending / descending frame and lightly raising the pair of ascending / descending arms.

In contrast to the above, by extending the arm of the advancing / retreating cylinder, each of the pair of lifting arms falls on the contrary to the front. At this time, the height of the apparatus is reduced by horizontally tilting the cam arm about the connecting shaft of the other pair of telescopic arms.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. A is a base frame, B is a heavy object such as a heavy object, and a pair of telescopic arms 1 and 2 for lifting the same object are horizontally connected shafts 3.
It is pivotally supported via a through. Each of the arms 1 and 2 is composed of a pair of arms.

The lower end of one of the telescopic arms 1 is pivotally supported by the mounting bracket 4 of the base frame A,
Roller 6 mounted on both ends of a horizontal connecting shaft 5 connecting the upper ends of the
It is mounted so that it can roll freely. The upper end of the other pair of telescopic arms 2 is pivotally supported by the elevating frame 7 via a mounting metal fitting 8, and a rolling wheel 10 rolling on the base frame A is attached to both ends of a horizontal connecting shaft 9 connecting the lower ends. Is mounted and the cam arm 11 is mounted.

At the tip of the cam arm 11, a supporting roller 1 that rolls while supporting the lower edge of the one telescopic arm 1 is supported.
2 is pivotally mounted, and each tip end of a bifurcated cylinder arm 14 of a screw cylinder 13 which constitutes the advancing / retreating cylinder set on the base frame A is pivotally supported on a lower eccentric portion. In the figure, 15 and 16 are a drive motor and a speed reducer for the screw cylinder. Reference numeral 17 is a horizontal connecting shaft of the pair of cam arms 11.

Since the illustrated embodiment is constructed as described above, when the cylinder arm 14 of the screw cylinder 13 is retracted, the cam arm 11 is rotated, and accordingly, the expansion and contraction is performed via the support roller 12. A lifting force is applied to the arm 1, the pair of telescopic arms 1 and 2 stand up with a small force, and the force B is lifted lightly. On the contrary, when the cylinder arm 14 is extended, the cam arm 11 rotates in the opposite direction, and the force B is lowered. At this time, since the cam arm 11 rotates until it falls near the horizontal, the elevating device composed of the telescopic arms 1 and 2 is lowered to a low level, and the height of the hoisting device can be reduced.

Reference numeral 18 in the drawing denotes a stretchable skirt.

[0012]

As described above, according to the present invention, in a pantograph-type lifting device such as a press, a cam arm is mounted on the end of one of the two telescopic arms that are crossed in a squid shape. Connecting the cylinder arm of the ascending / descending cylinder to the same cam arm and applying a lifting force via the cam arm at the time of starting the lifting, so that the lifting action is performed lightly, and the compression force generated in the telescopic arm,
It is possible to reduce the tension of the screw cylinder, reduce the weight of the telescopic arm, downsize the screw cylinder, and reduce the motor power.

Further, since the telescopic arm angle can be activated from 0 °, the height of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a heavy object lifting device according to the present invention.

FIG. 2 is a front view showing a heavy object raising work state.

FIG. 3 is a front view showing a working state when descending a heavy load.

[Explanation of symbols]

 A Base frame B Squeezing 1 One telescopic arm 2 The other telescopic arm 3 Horizontal connecting shaft 4 Mounting bracket 5 Horizontal connecting shaft 6 Rolling wheel 7 Lifting frame 8 Mounting bracket 9 Horizontal connecting shaft 10 Rolling wheel 11 Cam arm 12 Support rolling wheel 13 Screw Cylinder 14 Cylinder arm 15 Drive motor 16 Reduction gear 17 Horizontal connecting shaft of cam arm 18 Telescopic skirt

Claims (1)

[Scope of utility model registration request] 1. A lower end portion is pivotally supported by a base frame,
One of the two telescopic arms is mounted on a horizontal connecting frame between the upper ends of the two wheels, and is rotatably mounted on a horizontal lifting frame mounted on a heavy object. The upper end of the other pair of telescopic arms pivotally attached to the lifting frame is pivotally supported on the elevating frame, and a rolling wheel mounted on a horizontal connecting shaft that connects the lower ends is rotatably mounted on the base frame. In the pantograph type lifting device, the cam arm is mounted on a lower horizontal connecting shaft on which the wheels of the other telescopic arm are mounted, and the lower end edge of the one arm is mounted by the roller mounted on the cam arm. Is horizontally rotatably supported, and a tip end of a cylinder arm of a forward / backward movement cylinder mounted on the base frame is pivotally supported at an eccentric position of the cam arm.