US1549087A - Pinwheel - Google Patents

Description

Aug. 11, 192s.

o. JUNGHANS PINWHEEL Fed Nov. 14. 1924 Jrgj.

Patented Aug, 11, 1925.

USKARJ'UNGHANS, OIE SCHRAMBERG, GERMANY.

PINWHEEL.

Application filed November 14, 1924. Serial No. 749,971.

To all whom t may concern: I

Be it known that l, @sinn JUNoHANs, a citizen of the German Republic, residing at Schramberg, Germany, have invented certain new and useful improvements in Pinwheels, of which the following is a specification.

My invention relates to pin-wheels and more particularly to the construction of pin-wheels for clockworks.

Pin-wheels of this type usually comprise a hub, two spaced disks integral with said hub and located vertically and in parallelism thereon, and pins inserted into and between the two disks in a symmetrical sequence or order. The pins commonly consist of highly polished steel wire and upon having been inserted into corresponding holes of the two disks they must be fixed in their positions which may be done either by riveting, punching, caulking or in any other suitable manner of laterally compressing or engaging the visible ends of the pins so that they will be firmly enrbedded in the two wheels.

Recently pin wheels of the kind are manufactured by casting under pressure and if the pins are not attached to the wheel during and by the casting operation, they must be inserted in the usual old manner, that is to say, they must be fixed in their positions by riveting, punching or the like in order to prevent the pins from accidentally slipping out.

Fin-wheels made by way of casting under pressure have an unpleasant appearance due to the grey colour of the casting metal and itis desirable to improve the outer appearance of the cast pieces by galvanization. The wheels, however, cannot be galvanized ei;- eept prior to the insertion of the polished steel pins, for otherwise the hard and smooth polished surfaces of the pins would be impaired and roughened which must be avoided for frictional regards, and further salts would deposit in the narrow spaces between the ends of the pins and the surfaces of the holes in which they arel supported, and such salts would subsequently come forth and make stains on the wheels.

For the above reasons it is imperative to insert and fix the pins in the wheels after galvanization. This, however, cannot be done in the usual manner and with the aid of means as hitherto employed for fixing the pins in the wheels, since the electro-plated coat would be destroyed or da-inagedthereby and the appearance of the damaged coat would be very unpleasant.

Considering these conditions I avoid, in accordance with my invention, all and any destruction or damaging of the electro-plated surfaces of the wheels and with this purpose in viewl fix the pins in the wheels by means of small ridges or lips provided at the rim or edge of each individual hole of the wheel. To this end the ridges or lips are, after the electro-plating operation and after the pins have been inserted, bent and flattened over the end of the inserted pin by means of any appropriate pressing` tool so as to fill the pin hole at its outer end and hold the pin in place. 1fn this way each pin will be fixed individually in its holes or supports without any liability of the electro-plated surfaces being damaged or torn.

l/Vith the stated objects in view my invent-ion consists in the combination and ar rangement of parts, as will be hereinafter more fully described, shown in the accompanying drawings forming a part of this specification, and particularly pointed out in the appended claims it being understood that changes in the form, proportion, size, and minor details may be made within the scope of the claims without departing from the spirit or sacrificing any of the advantages of the invent-ion.

In the drawings Figure l is a side or end view of a pin-wheel constructed according to my invention and Figures 2 and 3 are sections on the line A-B of Figure l; Figure 2 showing the state of the wheel without any pins inserted, and Figure 3 illustrating the condition of the wheel with the pins inserted and fixed.

ln the embodiment shown the pinwheel comprises an elongated hub h with the steel shaft or arbor e projecting at the two ends thereof, two spaced disks a and (l integral with the hub /i and pins Z) supported by the two disks so as to be in equidistant and parallel relationship to each other.

As will be seen in Figures l and 2 the disk t has a number of say six holes f which, as usually, are diametrically opposed and parallel to each other and to the aXis of the arbor e. On the outer face of the disk (L small ridges or lips o are provided, two of said lips bordering the outer end or edge of each hole f, so as to abruptly coincide with the inner face of the hole, but gently declined towards the outei` face of the disk a. In lieu of tWo ridges or lips c three or more may be provided or an annular projection may surround the outer end of each hole f instead to serve the like purpose as the ridges or lips. It goes Without mentioning that While the holes f are complete pei't'orations, the corresponding holes g of the other disk ci do not extend fully through the Whole of the thickness of the disk d but are mere bores having a bottom for the pin to abut against.

As above stated the pin Wheel must be galvanized prior to the insertion of the pins. After galvanization the pins cut the proper length are inserted and the lips c are pressed, by means 0f a suitable pressing die or the like, over and into the holes f so that the latter will be closed and the pins prevented from slipping out, as clearly shown in Figure 3.

lVhat I claim is z- A pin-Wheel comprising aA hub, two spaced disks rigidly connected With the said hub and having a number of parallel holes, alined and equidistant from each other, a pin in each pair of corresponding holes7 and projections on the end face of the one disk for closing the holes and fixing the pins in place therein.

In testimony whereof I signature.

affixed OSKAR JUNGHANS.

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