DE544744C - Portable device for thread cutting on pipes - Google Patents

Description

For thread cutting on pipes, which z. B. are required for central heating, the fitters use cutting blocks with two or four arms to operate them two or three men are needed. Working with these clips is tedious and takes time Long.

The better working thread cutting machines are difficult to move to the construction site, since they cannot be taken apart.

The invention relates to a thread cutting machine, which easily disassembled and can be transported, as their individual parts ¹ S can be worn by a worker alone. It also has the following advantages:

1. Even pipes with the largest diameter can be carried out by a single worker without fatigue be provided with threads.

2. Any work required on the construction site (thread cutting, cutting the pipe, placing the socket) can be done with the machine without removing the pipe needs.

3. Any manual work on the pipe is superfluous.

4. Any type of thread can be executed with it.

There are already devices for thread cutting has been proposed with which the achievement of the same advantages was sought and that of the device according to are similar to the invention. According to the known devices differs the invention in that as a result of the pivotable arrangement of a crosshead carrying spars, the end of the clamped pipe section quickly and easily for further processing can be exposed, while in the known devices this crosshead for exposing the pipe end first released from its connection with the cutting stock, then swiveled and finally pushed back with its support bar had to become. This work was cumbersome, and pushing it back required great effort, if not a result from jamming of the support beam in his camp was impossible.

An embodiment of the invention is illustrated in the drawings. It means:

Fig. Ι a cross section according to the line AA in Fig. 2, Fig. 2 is a plan view,

Fig. 3 is a side view,

Fig. 4 is a partial view of the crosshead with the front cover removed,

Fig. 5 a horizontal section through the same crosshead,

Fig. 6 a vertical section through the crosshead in the machine axis,

Fig. 7 is a partial section through the frictional connection of the driving gear ring nest

Fig. 8 a horizontal section through the spring plate, which the cutting stock pushes against the pipe,

Fig. 9 shows the same spring plate from above.

In the various drawings, the same letters always mean the same parts of the machine.

On a base α slide two clamping jaws b of a vice, which can be moved sideways by means of a screw c in order to clamp the pipe d to be provided with a thread. The screw c is moved by a hand lever c ¹ . The arrangement of this vice means that the pipe d to be machined is always in the axis of the machine, regardless of its diameter. Supports e and e ¹ are located on both sides of the base α . The support e carries a support strut f on one side and the support e ¹ carries a strut g on the other side. The support spar / designed as a guide arm is tubular and its support e also encloses it in the form of a short tube, while the spar in cross section shows the shape of two hollow cylinders which are connected by a vertical web. It is movably arranged around a vertical pin h on its support e ¹ , which is designed as a hollow box. The shape of the spar g was chosen because this rod has to carry its entire weight when the crosshead i ^{1 is} swiveled out, and the cross-sectional shape of two tubes connected by a web has a high load-bearing capacity with a low weight.

The support strut f and the strut g carry by means of two straps i the crosshead i ¹ , which includes the gears that move the tool.

The support spar f is connected to the crosshead i ¹ by two perpendicularly opposite bolts j (Fig. 3) and the spar g is connected to the crosshead i ¹ by a vertical pin k .

The crosshead i ¹ includes two parallel sets of gears, one driving and the other being driven. The arrangement of these gears allows two different working speeds, depending on the type of thread to be cut.

The little middle gear I is for that

determined small speed; it drives two large symmetrical gears m and m ¹ , which in turn drive gears p, p ¹ and q through their axes 0 and o ¹ .

If a higher speed is desired, one works with the middle gear wheel r, which drives the large gear wheels m and i ^1.

The drive at different speeds takes place in that either the handwheel j is pushed onto the hub I ^{1 of} the small gearwheel '/ or onto the hub r ^{1 of} the middle gearwheel r ; these hubs run on ball bearings.

The large gears m and m ^{1 of} the driving set each carry a ring gear m; between this and the wheel itself there is a frictional connection (m ^s and m ^s in Fig. 7) to prevent the handwheel from being hit too violently. To prevent breaks.

The driven gear set consists of the two symmetrically arranged small gears p and p ¹ , which sit on the same axes with the large gears m and m ^1. ■ "■ -

The gears p and p ¹ mesh with the large middle gear q . This is provided with a strong pin t , which carries a fork u to move the clip ν.

The cutting stock ν is also provided with arms which are in engagement with the arms of the fork u and are driven by them.

The pressing device inserted between the cutting clip ν and the crosshead i ¹ consists of a kind of sleeve χ (Figs. 8 and 9) which has two ears drilled through at x ^x through which it is connected to the crosshead i ¹ by means of screws .

The sleeve χ is also equipped with guide pins χ ² , which connect it to a round washer a ' ^s. This is under the action of the compression springs x ⁱ and presses the clip υ onto the pipe d to be processed.

As the thread cutting progresses by rotating the wheel J, the arms of the clip υ slide along the arms of the fork u . In order to place the clip ν on the tube d , the tube d is first clamped in such a way that it protrudes slightly over the delimitation indicated by the bolt /. Then you put on the clip ν loosely, and finally you close the crosshead i ¹ with a blow, whereby you can insert the latch / and the springs x * press on the clip ν.

To remove the clip ν again, open the crosshead i ¹ by turning it to the right, as can be seen from the dash-dotted part of Fig. 2-. _llfi

The whole machine can be quickly dismantled into its individual parts and then reassembled which makes the transport of the parts much easier.

The external shape, dimensions and details of the machine can be analogous be changed.

Claims (1)

Patentansi'RUCh: Portable device for thread cutting on pipes, in which the workpieces are temporarily clamped by clamping jaws moved back and forth by opposing threads and in which the cutting stock is pressed resiliently onto the workpiece by a device provided with springs and provided with a torque-limiting device with safety friction clutches, different for achieving rotational speeds of the die stock specific gear shift transmission is put into circulation, which is mounted in a raised lateral spars and with one of these beams by a pin pivotally connected Ouerhaupt, characterized in that the pivotally \ ^r affiliated with the Ouerhaupt (i ¹⁾ Holm (§ ·) selbs * can be pivoted around a pin (h) ^{which is arranged vertically in one of the two supports (e 1} ) attached to the side of the base (α) of the thread cutting device, and that the Ouerhaupt (i ¹ ) with the other support beam designed as a guide arm (f) is connected by means of two tabs (i) by two latches (/) so that the threaded pipe section can be swiveled out by simultaneously pivoting the crosshead (i ¹ ) and the spar (g) around the pin (h) in the support (e ¹ ) is exposed for further processing. 1 sheet of drawings