JPH01242400A - Positioner drop preventive device - Google Patents

Abstract

PURPOSE:To prevent drop of a supporting frame by boring a plurality of detaining holes at a certain spacing in vertical direction in one of the outsides of a post, securing frame to the lower part of a slide framing, and pivoting a pawl-equipped detent block at its bottom rotatably in the direction to the detaining holes. CONSTITUTION:If chain severance of a motor-driven chain block or brake failure in a winch are generated while a slide framing 4' is rising or at a standstill, the slide framing begins descending. At this time, a pawl 16 on a detent block 15 is inserted in the first lower-side detaining hole 12 in the position where the tip of the pawl 16 is in contact. This causes the slide framing 4' of a positioner to stop descending immediately, so that the slide framing 4' is prevented from falling. In case chain severance has occurred while the chain block is unwound down, a hydraulic cylinder 19 elongates, and the pawl 16 is inserted in the detaining hole 12 in the post 11, which prevents drop of the slide framing 4' and supporting frame.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates primarily to a fall prevention device for a positioner for workpieces.

Conventional Technique Welding Work 9 In assembly work, etc., when the weight, shape, etc. of the workpiece are large, a positioner is used to perform the work. FIG. 7 is a front view of the prior art positioner 1.
In the figure, 2 is a post, 3 is an electric chain block, and 4 is a post.
is a sliding frame, 5 is a turntable, 6 is a support frame,
7 is a motor for rotating the support frame.

Next, the configuration and functions of the conventional positioner 1 will be described. The positioner 1 consists of two posts 2 on the left and right that protrude from the floor, a sliding frame 4 that is fitted into the posts 2 so as to be able to rise and fall freely, and that is lifted up by an electric chain block 3 that is mounted on the top of the posts 2, and a sliding frame 4 in the center. It is comprised of a support frame 6 having a turntable etc. in its part. When the work is to be carried out, the workpiece is mounted on the turntable 5, and the sliding frame 4 is moved up and down by the electric chain block 3 to adjust the workpiece to a position where it can be easily worked.

Problems to be Solved by the Invention A support frame of a positioner for a workpiece is moved in the vertical direction by a hoisting device such as an electric engine block. In this case, the electric cenoblock's ceno (including wire rope) may break or the hoisting device brake (not shown) may malfunction. As a result, the support frame of the positioner would fall, so a stopper stand (8 in Fig. 7) was installed, but this could not be considered a safety device and there was a risk of personal injury.

An object of the present invention is to solve the above problems and provide a fall prevention device for a positioner that prevents the support frame from falling.

Means for Solving the Problems The means of the present invention taken to solve the above problems are as follows: (a) A plurality of locking holes are bored at a predetermined interval in the vertical direction on the entire outer surface of the post; , on the other hand, a frame is fixed to the lower part of the sliding frame, a locking block with a claw portion is pivotally supported at the lower end of the frame so as to be rotatable in the direction of the locking hole, and the locking block is A pin is provided at one end, and a hydraulic cylinder is fixedly attached to the frame, and the upper end of a link plate having an elongated hole is rotatably supported in the rod boss part of the hydraulic cylinder, and one end of the locking block is provided with a pin. Connect the link plate and the locking block so that the provided pin can slide freely along the elongated hole of the link plate, and 2. The center of gravity of the locking block when the hydraulic cylinder is in an extended state. The structure is such that the claw portion of the locking block can be inserted into the locking hole portion of the post.

Function 1. A locking block with a claw portion is pivotally supported at the lower end of the frame fixed to the lower part of the sliding frame using a pin at the lower end of the frame. The locking block can be rotated about the lower end pin of the frame in the direction of the locking hole of the post. Further, the claw portion of the locking block is provided on the side facing the locking hole portion, and the pin connected to the link plate is provided on the hydraulic cylinder side. The center of gravity of the locking block is biased toward the pin, so when the hydraulic cylinder is in an extended state, the pin of the locking block is located near the center of the elongated hole of the link plate, and the claw of the locking block is located near the center of the long hole of the link plate. The tip is in contact with the outer surface of the post having the locking hole.

When the electric chain block is hoisted and the sliding frame is moved upward, the hydraulic cylinder is kept in an extended state. When the locking block passes through the locking hole of the post while the tip of the claw is in contact with the circumferential surface of the post, the inclined upper surface of the locking block is in contact with the upper edge of the locking hole. Move up.

C. When the electric chain block is hoisted up and the sliding frame is moved downward, the hydraulic cylinder is operated to contract.

Then, the link plate connected to the rod boss portion of the hydraulic cylinder also moves upward. Since the pin provided at one end of the locking block is lifted upward by the lower end of the elongated hole of the link plate, the pin side of the locking block rotates upward about the lower end pin of the frame.

As a result, the tip of the claw portion of the locking block and the outer surface of the post having the locking hole portion are separated from each other, creating a gap. Therefore, in this state, the locking block moves downward together with the sliding frame.

2. When the sliding frame of the positioner is stopped,
Keep the hydraulic cylinder in an extended state. In this state, due to the center of gravity of the locking block, the tip of the claw is in contact with the outer surface of the post that has the locking hole, or
Or, the lower surface of the claw is engaged with the lower edge of the locking hole.

If an electric chain cutting accident occurs when the tip of the claw of the locking block is in contact with the above-mentioned outer surface of the post, when the sliding frame of the positioner starts to descend, The claw portion of the locking block is inserted into the first lower locking hole at the position where the tip of the claw portion was in contact. As a result, the sliding frame of the positioner immediately stops descending.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a positioner 10 equipped with a fall prevention device 9 according to the present invention, in which 3' is an electric chain block, 4'' is a sliding frame, and 11 is a boss. The figure is a view of the boss 11 in FIG. 1 seen from A, and 12 is a locking hole. In FIG. 3 is a detailed view of part B in FIG. ,1
4 is a lower end pin of the frame, 15 is a locking block, 16 is a claw portion of the locking block 15, 17.18 is a pin, 1
9 is a hydraulic cylinder, 20 is a rod boss of the hydraulic cylinder 19, 21 is a link plate 22 is a link plate 21
The elongated hole portion 23 is a bracket for mounting one hydraulic cylinder. FIG. 4 is a view seen from C in FIG.

Next, the configuration of the fall prevention device 9 according to the present invention will be described. A plurality of locking holes 12 having predetermined spacing in the vertical direction are bored on the entire outer surface of the post 11. on the other hand,
A frame 13 is fixed to the lower part of the sliding frame 4', and a locking block 15 with a claw portion is pivotally supported at the lower end of the frame 13 so as to be rotatable in the direction of the locking hole 12. A pin 17 is provided at one end of the stop block 15. Further, a link plate 21 having a hydraulic cylinder 19 fixedly attached to the frame 13 and having an elongated hole portion 22 in the rod boss portion 20 thereof is provided.
The upper end was rotatably supported by a pin 18. and,
The pin 17 provided at one end of the locking block 15 is slidable along the elongated hole 22 of the link plate 21.
The link plate 21 and the locking block 15 were connected.

At the same time, when the hydraulic cylinder 19 is in an extended state, the claw portion 16 of the locking block 15 is set to be insertable into the locking hole 12 of the post 11 due to the action of the center of gravity of the locking block 15. did. Note that a pneumatic cylinder is used instead of the hydraulic cylinder 19.

A magnet (not shown) or the like may be attached, and air pressure from a pneumatic cylinder or magnetic force from a magnet may be used.

Next, the functions of the fall prevention device 9 according to the present invention will be described. When the sliding frame 4' of the positioner 10 is stopped, the hydraulic cylinder 19 is kept in an extended state. Let it be G. As shown in FIG. 3, the center of gravity G of the locking block 15 is biased toward the pin 17 side from the vertical line opening of the frame lower end pin 14, so the weight W of the locking block 15 causes the locking block 1 to
5 has a force that tends to rotate the frame lower end pin 14 in the direction of the arrow P. In the above case,
The claw portion 16 of the locking block 15 is connected to the locking hole portion 1 of the post 11.
2, there is no risk of the sliding frame 4' falling. However, when the claw portion 16 is not inserted into the locking hole portion 12, the sliding frame 4' is suspended and held by the chino of the electric chino block 3'. next,
When lowering the electric chenoblock 3' to move the sliding frame 4° downward, the hydraulic cylinder 19 is operated to contract. Then, as shown in Fig. 5, the hydraulic cylinder 19
Link plate 21 connected to rod boss portion 20 of
It also moves upward.

Since the pin 17 provided at one end of the locking block 15 is lifted upward at the lower end of the elongated hole 22 of the link plate 21, the pin 17 side of the locking block 15 rotates around the lower end pin 17 of the frame. Rotate upward (in the direction of arrow 2). As a result, the tip of the claw portion 16 of the locking block 15 and the outer surface A of the post 11 are separated, creating a gap m. Therefore, in this state, the locking block 15 moves downward together with the sliding frame 4'.

Next, when hoisting the electric chain block 3° to move the sliding frame 4° upward, the hydraulic cylinder 19 is extended in the same way as when stopping the sliding frame 4°. put. When the locking block 15 passes through the locking hole 12 while the tip of its claw 16 is in contact with the outer surface A of the post 11, the inclined upper surface of the locking block 16 is in contact with the upper end of the locking hole 12. and move up. While the above-mentioned sliding frame 4'' is moving upward or stopped, the electric chenobrock 3
If a chain cutting accident occurs or a brake failure occurs in the hoisting device, the sliding frame 4° begins to descend. At that point, as shown in FIG. 6, the claw portion 16 of the locking block 15 is inserted into the first lower locking hole at the position where the tip of the claw portion 16 was in contact. As a result, the sliding frame 4 of the positioner 10
Since the sliding frame 4' immediately stops descending, the sliding frame 4' is prevented from falling. If a chain cutting accident occurs while lowering the electric chain block 3'', the hydraulic cylinder 19 will extend and the pawl 16 of the locking block 15 will move into the locking hole of the post 11. 12 to prevent the sliding frame 4° and the support frame 6' from falling.

Effects of the Invention The support frame, sliding frame, etc. of the workpiece positioner are moved in the vertical direction by a hoisting device such as an electric chain block. In this case, the electric cenoblock's cenograph may break or the hoisting device brake may malfunction. As a result, the support frame of the positioner would fall, so a stopper stand or the like was installed, but this could not be considered a safety device and there was a risk of personal injury.

However, in the fall prevention device according to the present invention, a plurality of locking holes are formed at a predetermined interval in the vertical direction on the outer surface of the post, and a frame is fixed to the lower part of the sliding frame,
A locking block with a claw portion was rotatably supported at the lower end of the frame, and a pin was provided at one end of the locking block. In addition, a hydraulic cylinder is fixedly attached to the frame, and the upper end of a link plate having an elongated hole in the rod boss is rotatably supported, and a pin provided at one end of the locking block is attached to the elongated hole in the link plate. They were connected so that they could slide freely along the lines. Therefore, when a cutting accident occurs with the electric chain block, due to the action of the center of gravity of the locking block, the claws of the locking block are inserted into the locking holes of the boss, causing the sliding frame and support frame to fall. prevent.

Therefore, in the positioner fall prevention device according to the present invention, when a chain breakage or brake failure accident occurs, the support frame and the sliding frame are prevented from falling and disasters are prevented, thereby improving safety.

[Brief explanation of the drawing]

Fig. 1 is a front view of a positioner equipped with a fall prevention device according to the present invention, Fig. 2 is a view of the post in Fig. 1 seen from A, Fig. 3 is a detailed view of section B in Fig. 1, and Fig. The figure is the third
5 and 6 are views showing embodiments of the present invention, and FIG. 7 is a front view of a conventional positioner. 1 , 10 --- Positioner 2.11 --- Boss 3.3' --- Electric chain block 4.4' --- One Sliding frame 6, 6' --- One --- ----- Support frame 9
-=-=---=-1 fall prevention device 12--1 locking hole 13--111=--frame 15--=--1 locking block 16- --Claw portion 19 ---==-Hydraulic cylinder 2l--=--Link plate 22--1 Elongated hole portion Patent Application Toshiaki Sawara Representative of Jinyuya Heavy Industries Co., Ltd. Figure 1 Figure 2 Figure 3 Funeral Figure 4 Funeral Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] There are two posts on the left and right that protrude from the floor, a sliding frame that is fitted into these posts so that they can be raised and lowered, and lifted up with an electric chain block installed at the top of the posts, and a pivot between the left and right sliding frames. In a positioner consisting of a support frame with a turntable in the center, a plurality of locking holes are bored at a predetermined interval in the vertical direction on one side of the outer side of the post, while the lower part of the sliding frame is A frame is fixed to the frame, a locking block with a claw portion is pivotally supported at the lower end of the frame so as to be rotatable in the direction of the locking hole, and a pin is provided at one end of the locking block, and A hydraulic cylinder is fixedly attached to the link plate, and the upper end of a link plate having an elongated hole in the rod boss is rotatably supported, and a pin provided at one end of the locking block is attached to the elongated hole in the link plate. The link plate and the locking block are connected so that they can slide freely, and when the hydraulic cylinder is in an extended state, the locking block is moved against the locking hole of the post by the action of the center of gravity of the locking block. A fall prevention device for a positioner, characterized in that the claw portion of the positioner is configured to be insertable.