JP2578675Y2 - Overhead conveyor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead conveyor used for transporting a vehicle body in an automobile factory, for example.

[0002]

2. Description of the Related Art As this type of conveyor, Japanese Patent Publication No. Sho 60
As disclosed in Japanese Patent Application Publication No. 18580, a hanger having a vertically movable and horizontally rotatable object supporting arm, an elevating means for elevating the arm between an upper limit and a lower limit, and supporting the arm A rotating means for rotating between a position and a non-supporting position, and an arm rotation locking means for locking the arm by a lowering operation of the arm at the supporting position and unlocking the arm by an ascending operation of the arm. It is known that the means and the rotating means are separated from the hanger and installed on the ground side.

[0003]

The above-mentioned conveyor requires an occupied space for installing the lifting and lowering means and the rotating means, so that the floor cannot be used effectively.

The purpose of the present invention is to solve the above problems,
An object of the present invention is to provide an overhead conveyor that can effectively use a floor surface.

[0005]

SUMMARY OF THE INVENTION An overhead conveyor according to the present invention has a hanger having a vertically movable and horizontally rotatable object supporting arm, and rotates the arm between a supporting position and a non-supporting position. In an overhead conveyor comprising a rotating means and an arm detent locking means for locking the arm by the lowering operation of the arm at the support position and unlocking the arm by the raising operation of the arm, the arm is urged upward by a spring. And
The biasing force of the spring is set such that the arm descends against the biasing force of the spring by the weight of the arm and the transferred object, and the arm rises against the weight of the arm alone by the biasing force of the spring. Is provided on the hanger.

[0006]

In the overhead conveyor according to the present invention, the arm is urged upward by the spring, and the arm descends against the urging force of the spring due to the weight of the arm and the object to be conveyed. Since the spring biasing force is set so that the arm rises against the arm, when an object is placed on the arm, the arm is lowered and the arm is locked by the lock means, and the object is lowered from the arm. Then, the arm is lifted and the lock of the arm by the lock means is released, so that the arm elevating means is unnecessary.

Further, since the rotating means is mounted on the hanger, there is no need to install the rotating means on the ground side.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a transfer station of an object to be transported. An overhead conveyor 11 and a floor conveyor 12 and an object W to be transported between these two conveyors 11 and 12 are shown.
And a drop lifter 13 that transfers the same.

[0010] The overhead conveyor 11 is a power rail.
21 and free rails 22, and a load bar 24 that is stopped by a plurality of trolleys 23 running on the free rails 21
And a hanger 25 suspended from the load bar 24.

The hanger 25 includes a rectangular frame 26 fixed to the lower surface of the load bar 24 at a central portion in the left-right direction,
Left and right arm suspension rods 27 each having a pair of upper ends fixed to the left and right members of the frame 26 at an interval in the front and rear,
The transported object support arms 28 are provided at the lower ends of the rods 27, respectively.

The floor conveyor 12 includes a power rail 31 and a free rail 32, and a transferred object support 35 mounted on a plurality of trolleys 33 running on the free rail 32 via brackets.

The drop lifter 13 is composed of a pair of columns 36 erected on the right and left sides of the transport path of the two conveyors 11 and 12, respectively.
And a pair of lifting and lowering bodies 37 that move along both columns 36, and a pair of transporting object support arms 38 that are provided on the respective lifting and lowering bodies 37 and are placed so as to straddle the transported object W. I have.

FIGS. 2 to 5 show the detailed structure of the lower end portion of the arm suspension rod 27 and its peripheral portion.

A vertical shaft portion 41 is provided near the lower end of the arm suspension rod 27. A stopper flange 42 is provided above the vertical shaft portion 41, and a male screw 43 is provided below the stopper flange 42.

A transferred object locking member 44 is attached to the tip of the transferred object supporting arm 28. At the base of the arm 28, a vertical mounting cylinder 45 is provided integrally, and this is fitted over the vertical shaft 41 via a sliding bearing 46.

An arm 47 for rotating the arm is fixed to the mounting cylinder 45. Near the tip of the arm 47, a vertical lock pin 48 is fixed in the middle of the length. Lock pin
On the upper protruding part of 48, a tip connecting member 53 of a piston rod 52 of a hydraulic cylinder 51 for arm rotation is provided with a sliding bearing 54.
Is mounted through. The body side of the fluid pressure cylinder 51 is attached to a connecting rod 55 connecting the front and rear arm suspension rods 27 (the rear rod is not shown) so as to be horizontally swingable.

A stopper cylinder is provided below the mounting cylinder 45 of the vertical shaft portion 41.
56 is fitted. The stopper tube 56 is fixed to the vertical shaft portion 41 by a key 57 interposed between the stopper tube 56 and the vertical shaft portion 41 and a double nut 58 screwed into the male screw 43.

The flange at the lower end of the stopper cylinder 56 and the mounting cylinder 45
Compression spring between spring retainers 59 mounted near the lower end of the outer surface
61 is interposed, and the article support arm 28 is urged upward.

The stopper cylinder 56 has an arm 62 for stopping rotation of the arm.
Has been fixed. A lock pin receiving cylinder 63 is fixed in a penetrating shape near the tip of the detent arm 62. The lock pin receiving cylinder 63 is integrally provided with a stopper 64 having a semicircular shape in plan view.

As shown by a solid line in FIG.
When the piston rod 52 of 51 is retracted, the transported article support arm 28 is located at a support position protruded rightward from the arm suspension rod 27. In this state, when the piston rod 52 of the fluid pressure cylinder 51 is protruded as shown by a chain line in FIG. 3, the arm 28 is protruded rearward from the arm suspension rod 27, and the connection rod 55
Is located in an unsupported position stored above.

When the transport object support arm 28 is moved from the non-support position to the support position, the transport pin support arm 28 is positioned at the support position by the contact of the lock pin 48 with the stopper portion 64. When the article supporting arm 28 is lowered in this state, the lock pin 48 smoothly enters the receiving cylinder 63 while being guided by the stopper portion 64.

FIG. 2 shows a state in which the transported article supporting arm 28 is located at the lower limit of its lifting stroke at the supporting position. In this state, a gap is formed between the upper end of the mounting cylinder 45 of the arm 28 and the flange 42 so that the arm 28 can move up and down. The lock pin 48 is fitted into the receiving cylinder 63, and the arm 28
In this state, the object W is placed on the arm 28 and the spring 61 is compressed by the weight of the arm 28 and the object W. In this state, even if the piston rod 52 of the fluid pressure cylinder 51 is to be protruded as described above, it cannot be done.

When the transferred object W is lowered from the arm 28, the spring
The arm 28 is lifted by the arm 61 against the weight of the arm 28, the lock pin 48 is pulled out of the receiving cylinder 63, and the rotation of the arm 28 becomes free. Then, as described above, it is possible to move the arm 28 from the support position to the non-support position by projecting the piston rod 52 of the fluid pressure cylinder 51.

As shown by the solid line in FIG. 1, the lifting body 37 of the drop lifter 13 is made to stand by at the lower limit of its lifting stroke at the transfer station. When the transported object W is carried into the transfer station by the floor conveyor 12 and is positioned above the arm 38 of the drop lifter 13, the elevating body 37 is raised. When the elevating body 37 is raised to the upper limit as shown by a chain line in FIG. 1, the hanger 25 of the overhead conveyor 11 is carried to the transfer station. In this case, the transported article support arm 28 is located at the upper limit of the lifting stroke in the non-support position. When the hanger 25 stops at the transfer station or immediately before that, the arm 28 is moved from the non-support position to the support position, and the arm 28 enters below the transferred object W, the elevating body 37 is lowered. Then, the transferred object W supported by the arm 38 of the elevating body 37 is placed on the transferred object support arm 28, and as described above, the arm 28 is lowered by the weight of the arm 28 and the transferred object W to receive the transferred object. The lock pin 48 is fitted into the cylinder 63. Then, the transported object W is transported by the hanger 25, but the transported object W is transported in a stable posture since the rotation of the arm 28 is stopped by the lock pin or the like.

FIGS. 6 and 7 show a modification of the locking means. In this modification, the transferred object support arm 28
When two projections 71 are formed at the lower edge of the mounting cylinder 45, two notches 72 are formed at equal intervals at the upper edge of the stopper cylinder 56, and when the arm 28 is positioned at the support position,
The projection 71 can enter the notch 72.

[0027]

According to the present invention, when an object is placed on the arm, the arm is lowered and the arm is locked by the locking means. When the object is lowered from the arm, the arm is raised and the locking means is used. Since the arm is unlocked,
No arm lifting means is required, and since the rotating means is provided on the hanger, there is no need to equip both the arm lifting means and rotating means on the ground side,
The floor can be used effectively.

[Brief description of the drawings]

FIG. 1 is a front view showing an overhead conveyor according to the present invention together with a floor conveyor and a drop lifter.

FIG. 2 is an enlarged vertical vertical sectional view showing a part of the overhead conveyor.

FIG. 3 is a sectional view taken along line II-II of FIG. 2;

FIG. 4 is a sectional view taken along the line III-III in FIG. 2;

FIG. 5 is a perspective view of a portion shown in FIG. 2;

FIG. 6 is a sectional view corresponding to FIG. 2, showing a modification of the locking means.

FIG. 7 is an exploded perspective view showing a part of FIG. 6;

[Explanation of symbols]

 25 Hanger 28 Arm 48 Lock pin 51 Fluid pressure cylinder 61 Spring 63 Receiving cylinder W Workpiece

Claims (1)

(57) [Scope of request for utility model registration] 1. A hanger 25 having an object support arm 28 which can be raised and lowered and can be rotated horizontally, rotation means for rotating the arm 28 between a support position and a non-support position, and an arm in the support position. Arm 28 by the downward movement of 28
And an arm detent locking means for unlocking the arm 28 by the upward movement of the arm 28, wherein the arm 28 is urged upward by a spring 61,
The arm 28 descends against the urging force of the spring 61 due to the weight of the transferred object W, and the arm 28
An overhead conveyor, wherein the urging force of the spring 61 is set so that the arm 28 rises against its own weight, and the hanger 25 is provided with rotating means.