US3048001A - Spindle holder and method of making same - Google Patents

Description

Aug. 7, 1962 A. CARNITI SPINDLE HOLDER AND METHOD OF MAKING SAME I INVENTOR.

Filed Nov. 24, 1959 llnited dtates This invention relates to spinning means for textile spinning and/ or twisting machines, and more particularly, it is concerned with the spindle rotatably supporting structures, namely with spindle holders designed for rotatably supporting the spindle shaft on the spinning frame.

It is an object of this invention to provide a new and advantageous spindle holder structure which may be manufactured by making use of economically advantageous mass production methods and plants while the most desirable degree of closest standard and uniformity of finished work and of precise adjustment and assembling of spindle shaft supporting components may be ensured.

A more specific object of this invention is to provide a new and improved spindle holder including a holder body compound structure wherein the prevailing part of the body of substantially tubular shape is made of pressure die cast aluminum or light metal alloy and having the spindle shaft rotatably supporting bearing seat embodied into a machined part of a more hard and stress resisting metal, namely of hardened steel.

A further object of this invention is to provide, in an improved spindle holder of the above character, a steel made tubular component having a bearing seat forming upper enlarged portion integral with a co-axial lower tubular portion, and a light metal pressure die cast holder body having an open upper end portion and provided with the various flange, screw-threaded and shaped parts and implements required for securing the holder to the spindle frame, and wherein the said tubular comp'onents lower portion is embedded into the upper end portion of said holder body-whereby the said compound structure is provided with a hard, stress resisting and precision machined component arranged in the structure to form the portion thereof adapted to meet the requirements of precise fitting of the said spindle shaft bearing and stress resistance, while the remaining prevailing portions of the structure, which are obviously not subject to such requirements, are embodied in a cheaply mass manufacturable component.

Another object of this invention is to provide a new and advantageous method for mass producing a spindle holder as above, including the steps of providing a steel made tubular component fully machined and ground to meet the requirement of adaptation and precise fitting of the spindle shaft rotatably supporting ball or roller hearing, of locating the said finished steel tubular member about a shaped rod into a die, and of pressure die casting the holder body forming component into said die about the said tubular component.

These and other objects and advantages of the invention are in part obvious and in part will be made apparent as this disclosure proceeds, and the features which are believed to be new and characteristics of the invention will be in particular set forth in the appended claims.

The invention itself, however, both as to its construction and to the method of carrying out the same, will be best understood from the following detailed description of a preferred form of embodiment thereof, when taken in conjunction with the accompanying drawing, forming an essential component of this disclosure, and wherein: FIGURE 1 is a vertical longitudinal sectional view of the inner portion of a conventionally made die wherein the pressure die casting step may be performed for mass production of the spindle holder of FIGURE 2, wherein the finished article of manufacture atent is illustrated partly in side elevation and partly in longitudinal sectional view, in an exploded view including the other spindle assembly components designed to be structurally connected to said holder; and

FIGURE 3 is partly a side view and partly a sectional vertical view of the upper portion of the spindle assembly wherein the components of FIG. 2 are shown in their final fitted and connected relationship.

Referring now to the drawing, wherein like reference numerals refer to like components and parts throughout the several figures, and wherein the components which are not characteristic of the invention, namely the bearing and the spindle rotatably supported parts, have been illustrated by light drawn lines for best visualization of the structure of the invention:

According to the method of the invention, the prevailing part of the spindle holder is produced by pressure injecting liquid aluminum or other suitable light metal alloy, say through an inlet passage 1d (FIG. 1) into the cavity 11 of a die 12. The said die 12 is conventtionally produced in two detachable parts and connected to a suitable die casting apparatus (not shown) and, therefore, such means which are typical of manufacture of pressure die castings will not further be described as appertaining to current art.

The inner walls of die 12 are shaped to define the outer shape of the article of manufacture shown in FIG. 2, except the very upper portion thereof. Therefore in the said die an annular hollow 13 and an upwardly projected extension 14 are provided to produce in the pressure die casting step the flange portion 15 and respectively an upwardly directed brace 16.

The said brace 16 is designed for pivotally supporting, in the assembled spindle assembly of FIG. 3, by means of a pivot pin 17, a conventionally constructed hooking arm 18 adapted to prevent upward movement of the spindle, namely by acting as a stop member above the lower rib or flange 19 of the pulley 20 of which a conventionally produced spindle 27 is provided. Of course the said brace 16 might he therefore differently shaped and dimensioned according to the specific shape and arrangement of the rotating parts, according to current art.

The walls of cavity 11 of die '12 are further provided with a inner screw-threaded portion 21 (FIG. 1) adapted for producing upon the said pressure die casting step the outer screw-threaded portion 22 (FIG. 2) of the spindle holder body;j such screw-threaded portion is designed for engagement with a nut 23 (FIG. 3) adapted for securing the spindle holder to the spindle textile machine frame, framentarily indicated at 24 in FIG. 3, according to a conventional arrangement of parts, the spindle holder abutting from above on said frame 24 and the said 'nut 23 co-operating with the lower face 25 (FIG. 2) of the flange portion 15 of the spindle holder body. I According to current knowledge of the art to which this invention appertains, the rotating parts and components of a spindle as indicated at 27 are rotatably supported in the parent spindle holder by means of a hearing as indicated at 26 in FIGS. 2 and 3, said bearing being of ball or of roller type. The spindle holder must be therefore provided of a seat adapted for fitting the outer ring of such bearing 26, in the upper portion of the holder. It may be said that the proper service of a spindle assembly is prevailingly dependent from a very precise fitting of such bearing into its seat in the parent holder, and thatthe severe stresses to which the said assembly is subject are transferred from the rotating parts to said holder at such bearing seat. Therefore the said seat must :be very precisely machined and constructed of a material capable to resist to said stresses. A

On the other hand, it may be said that all remaining parts of the holder do not have to meet particular rea u? quirements, and, therefore, it is not worthwhile to produce the whole spindle holder of a material capable of meeting the above requirements confined to the bearing seat.

According to the invention, the compound structure of the spindle holder may be carried out by locating into the cavity of die 12 a rod 28 (FIG. 1) shaped for defining the inner cavity 29 (FIG. 2) of the lower tubular portion 39 of the holder, and by fitting about said rod in said die a tubular member 3-1 designed to constitute the stress resisting and bearing seat forming component in the said compound structure.

Such tubular member 31 includes an annular rib 32 at its lower end portion, located in the die 12 substantially at the level of flange 15 forming the enlarged portion 13 of the die cavity, and an upper enlarged cup shaped portion 33 wherein the seat 34 (FIG. 2) for the bearing 26 is made. Such upper portion includes further an upper edge portion 35 adapted to be inwardly bent, upon seating of bearing 26 in seat 34, for securing said bearing in said seat, as indicated at 35 in FIG. 3.

In the actual manufacture of the spindle holder, upon performance of the pressure die casting step no-substantial further working of the article is therefore required, except a conventional polishing step, namely by sandblasting, the drilling of a hole for pivot pin 17 and, eventually, the lathe-machining of surface 25 of flange 15 to improve the smoothness thereof.

It is believed to be evident that the invention provides a new compound structure of a spindle holder of the type considered, wherein the portion subject to severe stresses is embodied in a stress resisting material component and wherein the remaining portions not subject to particular requirements of resistance, hardness and precise workmanship are on the contrary embodied in a cheaply produced light metal body without prejudicing in any way the service of the device.

It is further believed to be evident that the invention provides a new and advantageous method of manufacture wherein the steps of precise machining of portions of the spindle holder, namely of the seat for the spindle shaft bearing, may be carried out by machining a relatively small sized and circular piece, namely the tubular component 31, and wherein the completely finished component may be positively connected to the remaining parts of the holder by a successive pressure die casting step including the forming of the several other features of the article, namely the external and internal shaping of the holder body and the provision of the external screwthreading required for securing the spindle holder to the textile machine spindle frame.

While the invention has been described and shown but in one form of embodiment thereof, it is obvious that the invention itself is not limited to the very details shown, and that several structural modifications and variations might be made thereto, according to the art.

It is moreover believed to be evident that the present invention includes a plurality of advantageous features, and it will be understood that each of the new features described and any combination thereof may find useful application in other constructions of spindle holders differing from the ones described.

Without further analysis, the foregoing will so fully reveal the gist of this invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of this invention and, therefore such adaptations should and are intended to be comprehended within the spirit and meaning of equivalence of the invention, as defined in and by the appended claims.

Having thus described the invention and the mode of carrying out thereof, what is claimed as new and desired to have protected by Letters Patent is:

1. A method for making a spindle holder, comprising the stepsof machining the inner bore of a tubular spindleholding component which has outwardly projecting anchoring means and consists of a hard material; placing said spindle-holding component in a die cavity; placing a core rod having an outer surface matching the surface of said bore of said spindle-holding component in a position passing through said bore and projecting into said die cavity spaced from the walls of the same; casting a less hard material into said die cavity about said projecting portion of said core rod and about said anchoring means so that the latter is embedded in said less hard cast material while an inner cavity is formed in said less hard material about said core rod; permitting said less hard cast material to solidify so as to form a second component permanently and integrally connected with said spindleholding component and having an inner cavity, exactly aligned with said machined inner bore of said spindleholding component without requiring an assembly and machining operation; and withdrawing said core rod through said bore from said spindle-holding component and from said second component.

2. The method set forth in claim 1 and including the step of making on said spindle-holding component a head portion at one end remote from said anchoring means; and placing said head portion in contact with the inner surface of said die cavity during the casting of said second component so that the same fills said cavity only to said head portion so that said head portion forms one end portion of the spindle holder.

3. A method as set forth in claim 2, and including the step of machining said bore to a greater diameter in the region of said head portion before placing said spindleholding component in said die cavity; and including the steps of placing a bearing in said bore portion of wider diameter, and bending the edge of said head portion inwardly over said bearing to hold the same in said bore.

4. The method set forth in claim 1 wherein said spindleholding component is made of a hard metal; and wherein said second component is made of a lighter metal.

5. An integral spindle holder comprising a tubular hard-metal component having at one end means for holding a spindle bearing and on the other end outwardly projecting anchoring means transversely projecting therefrom, said hard-metal component being provided with a machined inner borehaving a cylindrical inner surface; and an integral die-cast component having an end portion over-lapping said other end of said hard-metal component with said anchoring means fully embedded in said end portion of said die-cast component for permanently preventing relative movement of said components, and an elongated other end portion extending from said hardmetal component and being formed with an inner cavity exactly aligned with said machined inner bore of said hard metal component, said inner cavity being provided with an inner cylindrical surface having the same diameter as said cylindrical inner surface of said bore so as to form a continuation of the same.

References Cited in the file of this patent UNITED STATES PATENTS 1,460,515 Selker July 3, 1923 1,494,099 Cole May 13, 1924 1,681,906 Taylor Aug. 21, 1928 2,051,641 Magrath Aug. 18, 1936 2,241,118 Cotchett o May 6, 1941 2,485,093 Gelpke Oct. 18, 1949 2,724,945 McGhee a Nov. 29, 1955 FOREIGN PATENTS 1,176,426 France Nov. 24, 1958 1,054,887 Germany Apr. 9, 1959

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