US1585236A - Spool - Google Patents

Description

Bday 18, 1926.

H. H. DOEHLER ET A1.

sPooL Filed July 1, 1925 l l lllgll/ nvVENToRS Her/nan H. 0o eA/er A TTORNEYJ Aelectroniagnetic coils, for example.

Patented i May 18, 1926.

UNITED STATES PATENT OFFICE.

HERMAN H. DOEHLER AND LOUIS H. MORIN,- OE NEW YORK, N. Y., A-SSIGNORS T0 DOEHLER DIE-CASTING CO., A CORPORATION OF NEW YORK.

SPOOL.

Application led July 1, 1925. Serial No. 40,738.

Metallic. die-cast spools have to a large extent replaced wooden spools for holding smaller sizes of wire such as is wound into These spools have an axial bore of a suitable size to fit upon a spindle, while the outside diameter of the spools must be considerably larger in order that the first layers of the wire will not be wound so small as to make the wire wavy and hard to rewind. For the sake of lightness and economy in metal, the metal spools are made in the form of relatively thin shells with an axial bearing tube mounted within them and concentrically spaced from the spool body. The mounting of this axial tube presents a problem to which our invention is directed.

p The metallic spools heretofore commonly used have an integral bearing for the tube at one end, and at the other end a seat for a disc having a central hole forming a bearing for the opposite end of the tube. In this type of spool the tube is assembled in the spool after the spool body is cast, the

r ends of the tube being expanded outside the two bearings to hold it against longitudinal movement, and the parts are suitably shaped to lock the tube to the spool body against relative angular movement. .The pulling of theL core requires that one of the end bearings be removable.

In accordance with our invention the tube isv permanently united to the spool body through a single integral web which may be disposed anywhere within the spool and which'so tightly embraces the tube as to hold it against any relative movement.

vl'ractically this is accomplished by casting the spool upon the tube as an insert. The web may be made quite thin since it is subjected torelatively little strain and its embracing portion may be elongated to the extent necessary to effect the requisite rigidity. The embraced portion of the tube may be knurled the better to secure the parts together, although it will be found that ordinarily this is unnecessary.

In the drawings we have shown two embodiments of our invention differing primarily in the location ofthe attaching web, Figures 1 and 2 being, respectively, a longitudinal section and a left end view of one form, and Figures 3 and 4 being corresponding views of another lform.

In the form of spool `shown in Figures 1 and 2, the attaching web is at the extreme end of the spool. The body 1 is a relatively thin shelled tube of die-cast metal having the usual flanged ends 2 and 3. The "axial bearing tube 4 is composed of suitfa'ble hard metal, such as steel, and is shownas somewhat shorter than the over-all length of the spool. This tube 4 is materially smaller than the shell 1, and consequently there is a considerable annular space 5 between the tube and the shell. A web 6, which is integral with the shell 1, couples the tube and Nshell, this being accomplished, as above suggested, by casting the spool directly upon the tube. In the construction of Figures 1 and 2, this web 6 is, as above stated, at the 4extreme end 'of the shell 1, and a corresponding end of the tube 4 has its external surface knurled, while the embracing portion of the web is somewhat elongated. Due to the dilerent co-eliicients of expansionand contraction possessed by the metals of the'shell and of the tube, the webl embraces t-he tube very tightly when the casting is -cooled and forms a rigid connection between the two parts. The opposite end ot' the casting is left open for core-pulling purpose. A small'hole 7 may be provided in the web 6 for the reception of a driving IVe have/found that the axial tube is' ordinarily held sufficiently rigidly for all practical purposes when the web is located at the extreme end, as in the construction of Figures 1 and 2. However, if preferred, the web may be centrally disposed, as shown in Figures 3 and 4. In this form, the weby boss at one point to accommodate the. driving hole 7. y

It is obvious that various modifications may be made 1n the construction shown in t-he drawings yand above particularly .der`

scribed and illustrated within the principle and scope of our invention.

casting and, in this instance, the shell is. thickened or provided with .a longitudinal We claim:

l. A metallic hollow spool including an axial tube of metal harder than the spool body and of substantially smaller diameter thanl the hollow' interior of the spool, and an integral, transverse tube-gripping portion Within the spool fitting around the tube for a small part of the tubes length with sufficient tightness to hold the tube positively against rela-tive longitudinal or angular movement.

2. A hollow spool .of die-casting metal with an axial tube of harder metal substan tally smaller in diameter Ithan the hollow interior of the spool andhaving an external roughened portlon, and an integral web Within the spool gripping the tube abqut the. roughened portion sufficiently tightly to prevent relative longitudinalor angular l movement.

In witness whereof, We hereunto subscribe our signatures.

HERMAN H. DOEHLER. LOUIS H. MORIN.

Images