DE258524C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 258524 CLASS 49 c. GROUP

BROTHERS PIERBURG in BERLIN.

for thread cutting.

Patented in the German Empire on December 31, 1911.

The invention relates to a machine that can be plugged onto the work spindle of drilling and similar machines Device for thread cutting. In the case of the known thread-cutting ones Additional devices is the variability of the switching movement of the tool and the production of different threads can only be achieved by laborious replacement. The object of the invention is free from this disadvantage and is intended to be used on workpieces to cut any thread, internal, external or plane thread and to turn conically inside and outside without the workpieces having to relax.

According to the invention, the shifting movement, which can be changed by change gears, is controlled by the Transfer the drilling spindle to the cutting tool. The rear derailleur of the tool can be coupled with the switching mechanism of the tool carrier, so that by virtue of the common Switching movement of the tool and the tool carrier turned conically or drilled without having to adjust the tool to the angle of the cone.

The machine drive for switching the tool can be triggered by Moving a sleeve mounted displaceably on the drilling spindle can be effected, which carries the change gear holder and the counter gears and is coupled to the overhung support on the spindle can be.

In the drawing, the subject matter of the invention is illustrated in an exemplary embodiment.

Fig. Ι shows a section along line i-i of Fig. 2,

Fig. 2 is a longitudinal section
Fig. I,

Fig. 3 is a longitudinal section
and

Fig. Ι

Fig.

On line 2-2 of the

Line 3-3 of the

a section along line CD of the

is the support a

the drilling spindle i

arranged on the fly. The support α has a carriage b which carries the device described below.

The carriage δ is connected to a housing c in which the axial steel holder e is slidably mounted in a long sleeve d. The transport spindle f engages the steel holder e and is firmly connected to a sleeve g on which a coupling sleeve h is slidably but non-rotatable. On both sides of the sleeve h , gears ζ are loosely arranged on the sleeve g , which gears can be alternately coupled to the sleeve g by shifting the coupling sleeve h to achieve right-hand or left-hand gear. On the drilling spindle i , a sleeve k is arranged displaceably and freely rotatable, which is detachably coupled to the support α and on which a change gear holder I and a gear wheel m are loosely mounted. A gear η is rigidly connected to the sleeve k between the change gear holder I and the gear m . The holder I is secured against the rotary movement and carries the change and transmission wheels 0, p, q, r.

The housing c has in the illustrated

45

50

55

60

65

70

Embodiment a worm gear ring Z, in which a worm S arranged on the carriage b engages. The slide b is provided with a circular groove IV which is dovetail-shaped in cross section and in which correspondingly dovetail-shaped projections of the housing c are guided. The storage of the housing allows it to rotate

ίο and thereby set the tool at an angle to the plane of rotation of the support α .

A shaft B and a screw spindle A are mounted in the support α. On the screw spindle A , a gear wheel E is freely rotatable, but non-displaceable, and can be coupled to a coupling sleeve F which is mounted on the spindle so as to be displaceable and non-rotatable. A gear G, which is fixed on the shaft B , engages in the gear E. If the coupling sleeve is engaged in the gear wheel E , when the switching movement is transferred to the steel holder e, a switching movement of the carriage b takes place at the same time. The tool therefore cuts a conical thread into the workpiece.

When the drilling spindle i rotates, the gear η moves and drives the wheels 0, ■ p, q, r, m, s, t, u, v, the latter of which sits on the shaft B , which drives the wheels w, x , y, ζ drives, which effect the advance of the bushing d and the steel holder e.

By exchanging the change gears 0, f , the variability of the switching movement and the production of different threads in any number of gears can be easily achieved. You can also turn the housing c with the help of the worm S and by engaging or disengaging the switching and disengaging devices E, F on the two spindles A and B, as the drawing shows, to turn conically and flatly as well as conically - and to cut face threads.

If the switching movement of the displacement members of the support α is to be caused by a rotary star, the sleeve k, which engages with the coupling teeth in the hub of the support, is moved out of its operative position so that the coupling teeth are no longer in engagement with the hub of the support α stand and the sleeve does not take part in the rotary movement of the drilling spindle, or the coupling sleeve F is disengaged from the gear wheel E. Then one puts a rotary star on one of the ends of the screw spindle A , which can be driven in a known manner by a fixed stop.

Claims (3)

Patent Claims: 1. On the work spindle of Bohru. Like. Machines attachable device for thread cutting, characterized in that a switching movement variable by change gears is carried out by the Drill spindle is transferred from to the cutting tool. 2. Apparatus according to claim 1, characterized in that the change gear holder (I) is mounted on a sleeve (k) which is slidably arranged on the drilling spindle (i) and which is connected to the support. (a) ' can be coupled by sliding. 3. Apparatus according to claim 1, characterized in that the switching movement of a shaft (B) driven by the change gears, which drives the tool, is transmitted to a screw spindle (A) which can be coupled to the shaft (B) and displaces the tool carrier (c) to achieve a tapered thread. 1 sheet of drawings.