US2340542A - Electro-motor-driven vertical centrifugal machine - Google Patents

Description

A Feb. l, 1944. J. w. LUBBERHUIZEN 2,340,542

ELECTRO-MOTOR DRIVEN VERTICAL CENTRIFUGAL MACHINE- Original Filed Nov. 21, 1938 Patented Feb. i, 1944 UNITEDb sTATEs PATENT oFFicE ELECTRO-DIOTOR-DRIVEN VERTICAL CENTRIFIUGAL MACHINE Jan Willem Lubberhnizen, Lobositz, Germany vested in the Alien Property Custodian Original application November Z1, 1938, Serial No.`

Divided and this application December 23, 1939, Serial No. 310,722. In the Netherlands November 23, 1937 2 Claims. V(Cl. 248-26) The invention relates to an electro-motor driven vertical centrifugal machinev in particular a spinning pot for artificial silk, provided with elastic supporting means, such as rubber shock absorbers, connected to the casing of the machine.

This way of resiliently supporting the motor is generally known. In known constructions, however, the particular requirementsv to be fulfilled by these supporting elements were not sufllciently taken into account. The invention is based upon the consideration that the motor, upon being started and as long as the number of revolutions has not yet reached the first critical number,

' should be able to follow the oscillating movepot the axis of gravity remains in position and the motor should then be' able to perform a small precession motion at the bottom. Based on this insight the invention consists in this that the shock absorbers each have a portion that is freely slidable over centering pins or in centering holes of the foundation or stationary motor support whereas between the upper side of said pins or holes and the lower side of the motor casing there is a laterally non-clamped or free shockabsorber-length.

The shock absorbers are thus vertically compressible while at the same time the amount of play between the shock absorber portion surrounding the centering pin or inserted intov the centering hole of the stationary support enables the motor to be tilted and to fall back in a limited degree. The motor once having reached its normal number of revolutions, the laterally free shock-absorber-length referred to above may be slightly distorted by the shearing'stresses produced; in the case oi? a laterally clamped in shock absorber this would be impossible and also in the case of a shock absorber rigidly attached to the motor by means of a bolt or pin passing therethrough. Thus, according to the invention, a free shock absorber length affording the shock absorbing effect is combined with a shock absorber length for the centering of the motor.

Further features of the invention will be described herelnafter with reference to the accompanying drawing, in which Figs. 1, 2 and 3 are vertical sections of three embodiments of shock absorbers for an electromotor-driven vertical centrifugal machine according to the invention.

Fig. 4 is a vertical section of an electrical driving device incorporating the present invention as illustrated in Fig. 3.

In Fig. 4 a vertical spindle I, upon the upper end of which a spinning pot may be mounted, has been inserted into the hollow shaft 2 of a rotor 3 which together with a stator 4 constitutes the electromotor driving the spindle. rIhe spindle is ofthe type disclosed e. g. in the U. S. patent specification No. 2,089,933,` but it may of course be of other type. The spindle is axially slidable but non-rotatable with respect to the hollow rotor shaftl by reason of the fact that the lower end of the spindle is provided with a slot 5 which in the --position shown in Fig. 4 receives a transverse pin 6 secured in the lower end of the hollow rotor shaft. The spindle may be removed from the hollow rotor shaft by taking it out axially and upwards.

It is also possible to couple the lower spindle end to the hollow rotor shaft in another way than shown in Fig. 4. The spindle atits lower end might have laterally projecting ribs received in corresponding vertical longitudinal grooves in the lower wall portion of the hollow rotor shaft so that the'spindle may be inserted from above with said ribs into the grooves of said wall portion which to this end will have to be thicker v than the wall portion located thereabove.

The lcap at its lower edge is provided with an annular bead I-I adapted to receive under tension an annular spring I9 for securing the cap to a lower casing I5'. The spring is of the type shown in dotted lines and is constituted by a resilient wire in the form of a split ring having outwardly projecting ends 20, 20 adapted to be moved towards yone another so as to reduce the diameter of the spring and thereby unlock the cap I4.

Insertion and removal of the spindle as well as of the motor and bearings is thus very simple. Screw connections need not be established or unscrewed. l

'I'he hollow rotor shaft 2 is supported exclusively underneath the stator 4 in two superposed and spaced bearings I2 and I3. They may both be combined axial-and-radial-thrust-bearings, or

one of them may be a bearing of this type and the other one a tubular bearing. the essential point being that they enable the rotor shaft and rotor to be inserted and removed in axial direction. The stator casing II is supported upon elastic, rubber shock-absorbers 22. shown separately in Fig. 3.

In Fig. 1 in the lower side of the stator-casing I6, in a recess defined by a depending collar 2|,

the upper end of a rubber shock absorber 22 is clamped. This shock absorber is in its bottom provided with a recess 23 into which projects with some circumferential play a-centeiing pin 24 upon the upper surface of which the rubber shock absorber is supportedawith the bottom of its recess. The lower end surface 26 of the shock absorber is located at some 'distance above the foundation or stationary support 26 into which the centering pin 24 is secured. It follows that there is a laterally non-clamped or free shock absorber length a between the lower side of the casing i4 and the upper side of the pin 24 and that further the rubber shock absorber will be compressed between said surfaces. The rubber is thus conned between said surfaces and is not subjected to tensile stress.

In Fig. 2 the rubber shock absorber 22 is clamped in the' stator casing I6 by means of a relatively thin portion 21 having at its upper end a collar or thickened head 28. For the rest this embodiment is equivalent to that according to Fig. 1.

In Fig. 3 the rubber shock absorber 22 is provided at its upper end with a collarless relatively thin portion 21 clamped in the casing i6. At its lower end the shock absorber 22 is provided with a relatively thin portion 29 which is inserted with circumferential play into a hole 30 of the stationary support 26. The shock absorber 22 is entirely solid.

In Figs. 1 and 2 the hollow or tubular .lower end of the shock absorber 22 and the centering pin '24 have essentially the same centering function as the thin portion 29 of the shock absorber and l the hole in the stationary support in Fig. 3. Also in the latter embodiment the rubber of the shock absorber is confined between the stationary support 26 and the lower side of the stator-casing I8 and again there is a laterally non-clamped or free shock-absorber-length, denoted by b, between the casing and the stationary support. The lower end of the shock absorber at 3| is entirely free.

I claim:

1. In a vertical electric motor driven centrifugal machine, a casing, a motor in said casing, a. support for said motor and casing, vertically extending rubber shock absorber elements, each element comprising an upper portion encompassed by the casing and having a height relatively small in regard to the total height of the element, an intermediate laterally unconilned portion resiliently movable laterally and `having part of its cross sectional area resting on the support, and a lower support engaging portion extending downwardly of the portion resting on said support and having an amount of radial play between itself and the support so as to insure a limited resilient lateral movability of said lower portion.

2. In a vertical electric motor driven centrifugal machine, a casing, a motor in said casing, a

support for said motor and casing, vertically extending rubber shock absorber elements, each element comprising an upper portion encompassed by the casing and having a height relatively l small in regard to the total height of the element,

an intermediate laterally unconned portion resiliently movable laterally and having part of its Across sectional area resting on the support, and a lower support engaging portion extending downwardly of the portion resting on said support and around a portion of said support and having an amount of radial play between itself and the support so as to insure a limited resilient lateral movability of said lower. portion.

JAN WILLEM LUBBERHUIZEN,

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