CS253610B1 - Self-locking pliers for pipes - Google Patents

Abstract

Self-locking pliers for pipes, especially of large diameter, intended as a suspension device for a lifting device with a hook for the purpose of simple and safe handling. The pliers consist of two jaws mounted in a swinging manner in the jaw carrier and connected by means of rods to a suspension ring, which is provided with a transverse pin in the lower part for connection with the hook of the jaw carrier. The hook is supplemented with guide surfaces for the transverse pin. The suspension ring guided by the rods has a rectangular cross-section and is swingable on the hook of the lifting device by means of a control rope.

Description

(54)

Self-locking pipe clamp

Self-locking pliers for pipes of particularly large diameter intended as a suspension device for hoisting equipment with a hook for simple and safe handling. The pliers consist of two jaws attached to the jaw carrier and connected by means of rods to the suspension ring, which in the lower part is provided with a transverse pin for connection with the hook of the jaw carrier. The hook is completed with guide surfaces for the transverse pin. The drawbar guided ring is of rectangular cross-section and is pivotable on the hook of the lifting device by means of a control rope.

253 610

- 1 253 610

The invention relates to self-locking pliers for pipes, in particular of large diameter, intended as suspension means for hoisting devices with a hook in which simple and safe operation is provided.

The prior art self-locking pliers form a jaw carrier on which two jaws are pivotally attached to clamp the conduit at its lower half. The upper ends of the jaws are crossed and provided with round steel sections. These links pass through a circle of steel of circular cross-section suspended on the hook of the lifting device. The ring is fitted with a transverse pin at the bottom to engage the pair of hooks on the jaw carrier to secure the pliers in the open position for installation on the pipe. After placing on the pipe, the cross pin must be released from the hooks. The pin is locked into the hooks and released by turning the ring by means of a lever welded to it manually, and it is necessary to proceed to the pipe. The disadvantage is therefore twice the manual manipulation of the ring near the pipeline, which may not be safely stowed, the necessity of ascent to the means of transport or descent to the trench. The actual lever is often deformed from the boom of the lifting device. In addition, the joints between the ring members move the fixed point of the hinge near the pipe, so that when the pliers are suspended outside the center of gravity of the pipe, there is a large angular deviation of the pipe from the alignment.

The above drawbacks are overcome by the self-locking pliers according to the invention, which comprise two jaws attached to the jaw carrier and connected by means of tie rods with a suspension ring which is provided with a transverse pin for connection with the jaw carrier hook. for a suspension ring transverse pin which is of rectangular cross-section and guided by flat rods and is pivotable on the lifting device hook by means of a control rope.

- 2 253 610

The advantage of the solution according to the invention is, first of all, that after the piping has been placed in the desired location, the opening and securing of the pliers is performed automatically without operator intervention by simply lowering the suspension ring. Another advantage of the solution is that due to the flat rods and the guiding ring of a rectangular cross-section, the fixed point of the hinge moves away from the pipe up to the hook of the lifting device, allowing the pliers to be suspended outside the center of gravity. work, reduces washing effort and increases handling and piping performance ·

An exemplary embodiment of the self-locking pliers according to the invention is shown in the drawing, wherein FIG. 1 shows the pliers in the closed position and FIG.

The self-locking pliers consist of a single jaw 15 and a double jaw 16, which are pivotally mounted by means of a pin 17 in the jaw carrier 18 and connected by means of flat rods 6 to the suspension ring 2. The position of the transverse pin 5 relative to the hook X is ensured by an arch 5 in the suspension ring 2. ^{In its} lower part, the anchoring lug 13 of the control cord 8, by means of which the suspension ring 2 can be swiveled on the hook of the hoisting device χ to allow clamping of the jaws 15 and 16. The flat rods 8 are welded from the flanges 10 of the couplings 11 and the pins 12 .

Claims (4)

OBJECT OF THE INVENTION 253 610 Self-locking pipe clamp consisting of two jaws attached to the carrier and pivoted by means of tie rods provided with a transverse pin for connection to the jaw carrier hook, characterized in that the hook (1) is complemented by guide surfaces (2) and (3) for a transverse pin (4) of the suspension ring (5), which is of rectangular cross section and guided by flat rods (6) and is pivotable on the hook of the lifting device (7) by means of a control rope (8). 2. Self-locking brush according to claim 1, characterized in that the position of the transverse pin (4) relative to the hook (1) is secured by an arch (9) inside the suspension ring (5) in its lower part and pins (12) of flat rods (6). · Self-locking pliers according to claim 1, characterized in that the flat rods (6) are welded from belts (10), couplings (11) and pins (12). Self-locking pliers according to claim 1, characterized in that on the circumference of the suspension ring (5) in its lower part there is an anchor eye (13) of the control rope (8) which passes through the flat rods (6) and guide eye (14). single Jaws / 15 / ·