JPH061344Y2 - Lifting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lifting device. More specifically, the present invention relates to a lifting device capable of carrying a load with a small force and holding it at a predetermined place.

[Prior art]

FIG. 4 shows a lifting device using a parallel link mechanism, in which a column 9 and a joint 8 are arranged in parallel in two upper and lower parts.
The third arm 6 having the table 7 is attached to the tip of the joint 8 via the hinge 16 while being connected by the second arms 4 and 5, and the lateral beam 9A of the column 9 and the first arm 4 are further connected. A balance cylinder 1 having first and second rods 2 and 3 is disposed between the two, and a fluid pressure corresponding to a load W applied on the table 7 acts on the balance cylinder 1.

Here, 10 is a hinge that connects the second rod 3 and the column cross beam 9A, 11 is a hinge that connects the first rod 2 and the first arm 4, and 12 is a second arm (also called a tension rod). ) A hinge connecting the 5 and the joint 8,
Reference numeral 13 is a hinge for connecting the second arm 5 and the support column 9,
4 is a hinge for connecting the first arm 4 and the column 9;
Is a hinge that connects the first arm 4 and the joint 8.

By the way, the lifting device using the parallel link mechanism as described above has no problem when the load W is small, but when the load W is large or the rigidity of the arm is reduced to reduce the weight. When the third arm 6 bends at a right angle with the hinge 16 as a fulcrum when a load is applied on the table 7, a large twisting force acts on the first and second arms 4 and 5, and , Unreasonable force is applied to the balance cylinder 1. For this reason, the operation of the balance cylinder 1 is not smooth, and extra power is required in the strong case.

The above troubles occur even when a normal pressure cylinder is used instead of the balance cylinder.

[Purpose of device]

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and a balance cylinder that moves the first and second arms up and down even when a twisting force acts on the first and second arms. The purpose is to ensure smooth operation of a power cylinder such as a pressure cylinder or a pressure cylinder.

[Constitution of device]

The present invention that can achieve such an object connects the column and the load side member with two parallel upper and lower arms, and
In a lifting device for hoisting the two arms with a power cylinder, at least one of the hinges for supporting the upper arm uses a bearing having two or more degrees of freedom as a hinge on the side of the load side member, and at least one of the hinges for supporting the power cylinder. It is characterized in that a bearing having two or more degrees of freedom is used for the hinge on the side of the load side member.

Here, the power cylinder includes not only a balance cylinder having a balance mechanism but also a normal pressure cylinder.

〔Example〕

Hereinafter, the lifting device of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a lifting device according to the present invention, the main part of which is almost the same as that of a conventional lifting device, and the same parts are designated by the same reference numerals.

That is, the column 9 and the joint (load side member) 8 are
The third arm 6 having the table 7 is attached to the tip of the joint 8 via the hinge 16 while being connected by the upper and lower first and second arms 4 and 5 arranged in parallel.
Further, a balance cylinder 1 having first and second rods 2 and 3 is arranged between the cross beam 9A of the column 9 and the first arm 4, and the load W applied to the balance cylinder 1 on the table 7 is set. The structure is such that the fluid pressure corresponding to is applied.

Here, 10 is a hinge that connects the second rod 3 and the support cross beam 9A, 13 is a hinge that connects the second arm (also called a tension rod) 5 and the support 9, and 14 is the first arm 4 And 15 are hinges for connecting the first arm 4 and the joint 8. These hinges 10, 13, 14, 15 and the hinge 16 have a degree of freedom of 1 as in the prior art. In the present invention, a hinge 11 ′ connecting the first rod 2 and the first arm 4 and a second arm 5 connecting the joint 8 are used. The hinge 12 'has a second
A spherical bearing 17 having two or more degrees of freedom is used as shown in the figure.

As described above, when the spherical bearing 17 having two or more degrees of freedom is used at least at the hinges 11 ′ and 12 ′, even if the first and second arms 4 and 5 are twisted, the twisting is caused by the spherical bearing 17. Therefore, the balance cylinder 1 operates smoothly.

If desired, the hinges 10 and 13 may be replaced by the hinges 11 'and 1
The spherical bearing 17 may be used similarly to 2 '.

Furthermore, instead of the spherical bearing 17, the same effect can be obtained by using a spherical roller bearing 18 as shown in FIG. 3 or a universal bearing.

In the above description, the case where the balance cylinder is used has been described, but the same effect can be obtained by using a normal pressurizing cylinder instead of the balance cylinder.

[Effect of device]

As described above, according to the present invention, a power cylinder such as a balance cylinder or a pressure cylinder that moves the first and second arms up and down can operate smoothly even when twisted by the first and second arms. And is extremely useful industrially.

[Brief description of drawings]

FIG. 1 is a side view of a lifting device according to the present invention, FIGS. 2 and 3 are sectional views of a hinge having two or more degrees of freedom, and FIG. 4 is a side view of a conventional lifting device. 1 ... Balance cylinder, 4 ... 1st arm, 5 ... 2nd arm, 8 ... Joint, 9 ... Strut, 11 ', 12' ...
Hinge with 2 or more degrees of freedom.

Claims (1)

[Scope of utility model registration request] 1. A hinge for supporting an upper arm (12) in a hoisting device in which a support column and a load side member are connected by two parallel upper and lower arms, and the two arms are undulated by a power cylinder. ', 13) a bearing (17) having two or more degrees of freedom is used for at least the load side member side hinge (12'), and at least the load side member side of the power cylinder supporting hinges (10, 11 '). A lifting device comprising a hinge (11 ') and a bearing (17) having two or more degrees of freedom.