DE447443C - Jaw adjusting device for self-opening thread cutting heads with swiveling jaw holders - Google Patents

Description

GERMAN EMPIRE

ISSUED ON JULY 25, 1927

REICH PATENT OFFICE

PATENT LETTERING

M 447443 CLASS 49e GROUP

L 655661 j 49 e Date of publication of the patent grant: July 7 , 1927.

Landis Machine Company of Waynesboro, Franklin County, Penns., V. St. A.

Jaw adjusting device for self-opening thread cutting heads with swiveling jaw holders.

Patented in the German Empire on August 28, 1923.

The invention relates to thread cutting heads with swiveling jaw holders, in which after a certain axial displacement of the part of the cutting head that carries the cutting jaws the main body of which occurs an automatic opening of the cutting jaws.

The novelty consists in a special design of the coupling bolts of such cutting heads, in order to be able to adjust the cutting jaws from coarse cut to fine cut.

The invention is shown in the drawing, for example.

Fig. Ι is a longitudinal section through the cutting head,

Fig. 2 a section showing the fine adjustment of the cutting jaws,

Fig. 3 is a front view of the cutting head with the cutting jaws removed.

The cutting head consists of the main body ΐο ^α , which is hollow, as shown, or fully executed and a flange-like one

'Part ii ° has. In this the coupling bolts 34 ^s and 35 ^a are used. I5 ^a , i7 ^a is a ring that has the task of closing a gap ^{that occurs at the end of the flange n a during the axial displacement described below.} A ring i2 ^a concentrically surrounding the central portion 14 "in which the rotatable pins are arranged 2i °, which by means of screws 25" are held. The cutting jaws 23 ″ are ^{fastened to the bolts 21 a} , 22 ″ by screws 24 ″. They also have a second pivot point at 26 ″ (Fig. 3), in which an adjusting ring 13 ″ acts under the action of a not shown in the drawing Spring means that as soon as the spring relaxes, it rotates the ring 13 ° so that the cutting jaws 23 open. The rotation of the adjusting ring 13 ° is limited by bolts 46 ″ and slot 47 ″ between the ring I2 ^a and the adjusting ring 13 ″ are provided. So that the ring 13 ° does not shift axially on the middle part 140, a ring i8 ^{a is} provided, which is held on the middle part I2 ^a by screws 19 ″.

The release of the ring 13 ⁰ to open the cutting jaws is prevented as long as the pins 34 "and 35 °, as shown in Fig. 1 seen in the bores of the ring 13 'engage. If the ring 13 ″ shifts a certain distance in the axial direction, the aforementioned bolts lose their engagement and the ring 13 ″ can rotate under the action of the aforementioned spring. The coupling bolts 34 ° and 35 ° are provided at their front end with eccentric extensions 36 ″ and 39 ^a . The bolt 39 ″ is designed eccentrically on only one side, while the bolt 36 = on both sides. The purpose of this device is to be able to adjust the jaws from coarse cut to fine cut. For this purpose, the bolt 35 ° carries a ^{lever 41 ″ which is fastened by the pin 42 s} and which can be moved between the ^{end positions delimited by stop pins 43 a} (FIGS. 3 and 4). As can be seen without further explanation, by turning the lever achieved 41 ° from the position of Fig. 3 in that according to Fig. 2, a small adjustment of the ring 13 °, which adjusts the jaws on fine-cut. to rapid wear of the claimed most front ends of the bolts ^ff 34 ^a and 35, and ' To avoid the hole in the ring 13 °, hardened steel rings 37 ° are inserted into the holes according to the invention, which can be pulled out and replaced ^{by nuts 38 a.}

■ A ring 44 ° has the task of covering the gap between parts i4 ^a and io ° during the axial displacement.

Claims (2)

Patent claims: i. Jaw adjusting device for self-opening thread cutting heads with pivotable jaw holders, characterized in that the coupling bolts (34 ", 35 °) on their engaging in the adjusting ring (13 °) Ends (36 °) have an eccentric cross-section and one of the coupling bolts (35 °) for the purpose of adjustment the jaws are turned from rough cut to fine cut by means of a lever (41 ") can be. 2. Jaw adjusting device according to claim i, characterized in that for engagement of the coupling bolts (34 °, 35 °) in the adjusting ring (13 °) hardened steel bushings (37 ^a ) are arranged, which are provided by an underlying, screw-threaded ring ( 38 ") can be easily replaced. 1 sheet of drawings.