FI64523C - ANORDNING FOER ATT FAESTA ROER ELLER LIKNANDE PAO LAESTEN AV EN ROERBOEJNINGSANORDNING - Google Patents

Description

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Patent · och raghtwatyralian '' AmMon uttagd «* utUkrtton puWic * nd 31.00.03 (32) (33) (31) l * yr *« «y« meikein — 8 «| ird prfortuc (71) Putkitaivutin Oy, Sahaajankatu 17, ΟΟΙδΟ Helsinki 18, Finland-Finland (FI) (72) Sulo Ranne, Helsinki, Finland-Finland (FI) (74) Antti Impola {5I +) Device for attaching a pipe or the like to the bottom of a pipe bending device - Anordning för att fästa rör eller liknande This invention relates to a pipe clamp for a pipe or other shaped bar bender, which is attached to a removable bending bar and includes an eccentric which presses against the pipe in a groove facing the groove and on the opposite side of the groove. , which bends the pipe when the last turn.

The pipe or the like is generally bent by attaching the initial end of the bending point to a groove in the bending bar, after which the bar is rotated in the plane of the groove, whereby the suitably otherwise guided pipe bends according to the bar. Rotation of the free pipe part with the last is suitably prevented by slides, guide rollers, internal mandrel, etc. or combinations thereof. Successful bending requires that the end of the pipe or other bending point attached to the last does not slip on the last. Since the bending usually takes place in the cold, a rather large force acts on the pipe or the like to be bent, which means that the body to be bent must be fixed very firmly to the last, but so that its shape is not affected. For this purpose, m.m. various screw-mounted detents, but these are very cumbersome to use because the attachment is very slow to achieve and disassemble.

64523

Compression pieces which are actuated by means of pneumatic cylinders have also been used. However, such devices are very complex and, moreover, require compressed air equipment. For these reasons, such fasteners have become very expensive and have then remained of little use. A simply loop-like member has also been used which, in its suitable position, wedges the body to be bent onto the bending ladder. However, the grip of such a fastener-Rae is very uncertain and a bendable pipe or the like can easily slip, especially if a mandrel is used inside the pipe. Slippage usually results in bending failure.

The object of the present invention is to obviate the above-mentioned drawbacks and to provide a fastening device of the type mentioned at the beginning for a pipe bender, which device is both simple in construction and easy to use and thus suitable for working life. The invention is mainly known from what appears from the main claim. The fastening device has a body provided at one end with means for fastening to the bending ladder and at the other end provided with a transfer member by means of which the shaped body of With a simple movement, the shaped body can be effectively pressed against the body to be bent so that it cannot be completely slipped, and with the opposite movement it is again released from the compression and then detached from the last fastener, so that the bent pipe can be easily removed from the pipe bender. The body of the fastening device is most simply an arm, one end of which is releasably attachable to the last, preferably to its side or sides, and which at the other end has a pressing device with which the body to be bent is pressed against the groove of the bending ladder. The pressing device, on the other hand, has a movable shaped body in the body, which is simply pressed against a pipe or the like to be bent by means of an eccentric. The piece that can be pressed against the pipe with an eccentric naturally has a groove corresponding to the shape of the pipe on its side facing the pipe. The opposite side of the groove of the compressible shaped body is in this direction. In order to adjust the compressible body due to variations in the thickness of the pipe tolerances, this mold is preferably divided on a sloping surface 3 64523 into two parts, a wedge and the actual compression body which comes into contact with the pipe. The thickness can be either increased or decreased by moving the wedge piece separated from said pressing piece by said dividing surface along the surface in either direction. At a suitable point where sufficient compression is provided by an eccentric, the wedge-shaped body is attached to the compression piece, e.g. by means of a screw. The sliding surfaces are provided with suitable guide grooves and corresponding ridges on the other surface. The eccentric itself is preferably turned by means of a hand lever. The shaped body is fixed to the frame so that it has a clearance relative to it when it is moved by means of an eccentric. The body may advantageously be U-shaped so that the hooks formed by the ends of its arms can be gripped by pins arranged on the sides of the bending ladder, while the shaped body is placed between the arms and can be moved back and forth there. The control of the shaped body is suitably effected by means of a pin which is attached either to the shaped body or to the above-mentioned arms, whereby its guide in the other is somewhat loose so that the shaped body can move. Of course, the eccentric is then also mounted on said arms. Other control of the pipe or other such shaped body takes place in a manner known per se.

To illustrate the invention, reference is made to the accompanying drawing, which schematically shows an example of a fastening device according to the invention fitted to a last and seen from above, as well as a section of this device seen from the side along plane A-A.

The fastening device 1 comprises a body with arms 18 which terminate in a hook part 2 which can be fitted with the pins 3 of the last 4. Between the arms 18 there is a shaped body consisting of a pressing piece 6 and a wedge part 7 which can be moved back and forth along the groove 13 in the pressing piece. The surface 11 between the parts is in an inclined position with the groove 9 facing the pipe and the wedge 12 parallel to it. The wedge 7 can be locked to the press piece 6 by means of a screw 1¾. Due to the wedge's ability to move, it has a groove for the screw shank. A hole is made in the press body itself, through which a pin 17 is fitted, the ends of which extend through the loose openings 16 in the direction of the arms 18 in the arms 18 so that the press piece can move towards and away from the last under the direction of the pin. The arms 18 also have an eccentric 5 mounted on their shaft, which can be turned by means of a hand lever 15 connected to it. The eccentricity is very small, so that even a small force acting on the “64523 hand lever” produces a high compressive force with the eccentric 5.

For bending, the tube 10 or the like is placed in the groove 8 in the last 4 and pressed against it by the pressing piece 6 so as to turn the eccentric 5 against the combination formed by the pressing piece 6 and the wedge part 7. Prior to this, the pressing part 6 is manually arranged against the pipe 10 so that the groove 9 of the pressing part rests on the pipe. Then, by removing the screw 14, the wedge part 7 is manually brought into a position where it fills the space between the pressing piece 6 and the eccentric 5 in the neutral position, to which position the wedge is again fixed by means of the screw 14. Thereafter, by turning the eccentric 5 from the hand lever 15 close to its dead center, the tube 10 is made to be immobilized between the groove surfaces 8 and 9. After the bending the bending machine is rotated in the direction of the arrow X of the pipe lestiä attachment fittings and bends 8 of a last track in accordance with the further away the point of the tube support taiVmtusrullalla 19 and the like. The bending machine is used in general in these devices known as such other components such as e.g. a mandrel inside the tube.

After bending, the eccentric is turned to its neutral position away from its dead center, whereby the pressing piece also disengages from the piece and the entire fastening device can be removed from the pins 3, after which the tube 10 can be removed from the bending device.

It is clear that the invention is not limited to the application example presented above, but that many other embodiments can be presented within the scope of the following claims.

Claims (4)

5,64523 A pipe clamp (1) included in a pipe or other shaped bar bender, removably attached to a bending bar (4), and comprising an eccentric (5), which presses in a groove abutting the pipe non-stationary against the bending groove (4) of the tube (10), which bends the tube when the groove is rotated, characterized in that a wedge (7) is arranged between the inclined surface (11) between the compression body and the eccentric. 12) is parallel to the groove (9). Device according to Claim 1, characterized in that the wedge (7) can be fastened to the press body (6) by means of a screw (14). Device according to Claim 1 or 2, characterized in that the wedge (7) is displaceable in the groove (13) in the press body. Device according to Claim 1 or 2, characterized in that the wedge (7) is displaceable relative to the clamping piece under the control of a guide screw and guide ridges arranged in a row.