US1943435A - Expansion pulley - Google Patents

Description

Jan. 16, 1934. J. R. HERTENSTEIN EXPANS I ON PULLEY Filed June 25, 1932 Patented Jan. 16, 1934 L943fl orrsb STATES i i-it Jacob R. Hertenstein, Nashville, Tenn, assignor to Nashville Machine and Supply Company, Nashville, Tenn., a corporation of Tennessee Application June 25, 1932. Serial No. 619,177

4 Claims. (Cl. 64-8) My invention relates to expansion pulleys of present invention relates gives a better lay of the the type in which the driving member consists thread than either the usual flat belt or the gear of an expansible elastic rim which is connected drive, because the equalization of belt tension or to the hub member in such manner that it may slip seems to take place continuously, or sub- 5 be expanded and contracted to vary its engagestantially continuously, rather than intermittentco ment with the drive belt, such as'the expansible 1y, as in the case of the fiat belt in which no slippulley shown and described in Wardwell Patent page occurs while five or six turns of thread are No. 690,494, dated January 7, 1902. While my inbeing laid and all the slippage then takes place vention may be used for various purposes, it is at once. The V-belt apparently slips sufiiciently 1 particularly useful in machines for driving the to prevent the threads from being wound one spindles upon which are mounted what are immediately over the other in successive layers, termed in the trade cone cores for winding and lays t thr ad a enough pa t s that strands of textile materials, particularly rayon, y W not s a l wh n u wound from the cone in winding machines used in the textile industry. C

15 In machines in common use for the purpose indi- I tta e bj t Of y i v t and a cated, the most common practice is to use what plish h ds in View by a simp eiTiCient and are termed gainer pulleys, with expansible inexpensive construction of the rim of a gainer rims arranged to cooperate with fiat belts arpul y adapt d t p rat t a -s ap d ranged to drive pu11eys on th spindle shafts, belt as hereinafter fully described, and in prac- 20 such as the Wardwell pulley above mentioned, tice my novel driving device, so constructed, has but these fiat belts are open to certain objections been found 5 give y pe su ts. The by reason of which they are not entir ly ari essential elements of my invention are hereinfactory. A drive of this kind lays five or six f r more particularly pointed out in the apthreads rather too close together on the cone p d d a 25 core, and the next turn is spaced a considerable In the drawing, Figure 1 is a diametrical secdistance from the other threads. As a result of tion of a pulley embodying my invention. the threads being laid too close together, they Fig. 2 is a side view of the same shown conoccasionally snarl up when being unwound at e d by a V-SheDedbelt With a p y 011 a the knitting mills which buy and use the wound driven shaft, such as thecone core shaft 'of a 30 rayon. This results in inconvenience, loss of time winding ac n d I and defective work at the knitting mill, and loss 3 i a p p t of a we of four p to the producer of rayon in replacing defective used to expand the rim of the pulley which is cones. The inherent defect in this drive is bespecially formed to restrain it from rotation upon lieved to be due to a difference in tension on the the hub.

as driving and slack side of the belt which takes Like reference characters indicate like parts place until a slippage equalizing the tension in all the figures of the drawing. occurs, and this results in a periodical wide Describing now in detail the construction of spacing in the turns of the thread being wound. my novel expansion pulley, the hub 1 of the A positive gear drive for rotating the cone pulley is secured to the pulley shaft, driven in any H 40 cores has been tried, but this is objectionably suitable manner. This hub consists of an exa expensive, and is so positive in uniformly spacing teriorly threaded central portion 2 connected at the turns of the thread that each thread is laid one side to an amiular outer portion 8, which latdirectly on top of a turn beneath, without any ter is formed with radial bores, in the present inlead. This materially reduces the amount of stance four in number, arranged to receive pins,

45 rayon that can be wound on each cone core. The three of them marked 4 and one marked 10 on geared drive is furthermore not adjustable. the drawing,having their inner ends beveled in The principal object of the present invention is such manner as to cooperate with the outer to enable the spindles of the cone cores to be coned face of an interiorly threaded adjusting driven by means of a relatively narrow belt sleeve 5 mounted on the threaded portion of the 50 having inclined side faces, commonly referred to hub and extending into the space between such as V-belts, which shall be free from the objecthreaded portion and the annular outer portion.

tionable slippage and irregularity inherent in This adjusting sleeve is provided with a knurled flat belts, and which also shall be free from the end 6 by which it may be turned to force the pins objections incident toapositive gear drive. It has 4 and 10 outwardly, or permit them to shift inbeen found that the V-belt drive to which my wardly. '1

The outer ends of these pins are headed, and the outer faces of the heads shouldered so as to seat non-rotatably in a channel cut in the inner face of the split rim member 7 hereinafter described, so that the beveled inner ends of the pins will at all times be maintained in cooperative relation to the coned face of the adjusting sleeve and so that the split rim will be held in place on the hub members thus far described and restrained from axial displacement.

The split rim 7, to which my invention more particularly relates, is formed of spring metal and includes an inner spring section 8 extending continuously around the hub from its ends at the transverse split of the rim marked 9, and is formed with a central channel on its inner face, as above described. To prevent rotative slippage of the rim, the head of one of the pins, in the present instance the one marked 10, opposite the gap 9 (see Figs. 2 and 3) is formed with a recess adapted to receive a rib 11 extending across the channel at that point. Extending outwardly from the spring portion 8 of the rim are two series of arcuate flange sections 12 which are arranged in opposite divergent relation and together form a substantially continuous beltreceiving channel adapted to receive the V- shaped belt 13 which transmits power to the driven pulley 14 on the bobbin shaft. It will be noted that the spring section of the rim is flat and thin, whereby maximum flexibility and resiliency is attained, and that the bases of the flange sections stand between the center line of the rim and its outer edges, so as to provide a proper belt-receiving channel for the relatively thick and narrow belt. It will also be noted that the slots or gaps between the flange portions 12 of the belt groove permit the rim member to expand evenly and in some measure they also increase the gripping engagement between the belt and pulley. It is obvious that as the belt wears or stretches the spring rim can be expanded or allowed to contract through its inherent resiliency to adjust to a nicety its engagement in the channel of the pulley rim, and a much improved efficiency and regularity of function of the driving connection is thereby attained, as compared with any other form of driving device heretofore employed.

I claim:

1. In an expansible pulley including a hub member and a series of radial pins slidingly mounted in said hub member and means for equally shifting said pins radially, a transversely split rim member connected with the outer ends of said radial pins and formed with a spring inner section, and two series of arcuate flange sections arranged in opposite divergent relation together forming a substantially continuous beltreceiving channel adapted to engage a V-shaped belt, whereby expansion of the spring inner sec tion of said rim member will vary the effective diameter of the belt-receiving channel formed by said arcuate flange sections.

2. In an expansible pulley having a hub member, a transversely-split rim member connected with said hub member, said rim member being formed with a spring inner section and two series of arcuate flange sections arranged in opposite divergent relation together forming a substantially continuous belt-receiving channel adapted to engage a V-shaped belt, means for expanding said rim member, the expansion of the spring inner section of said rim member acting to vary the effective diameter of-the beltreceiving channel formed by said arcuate flanged sections, and means for restraining movement of said rim member in an axial direction.

3. In an expansible pulley having a hub member, a transversely-split spring metal rim member connected with said hub member, said rim member being formed with a flat thin inner section and two series of arcuate flange sections integral at their base with said inner section and arranged in opposite divergent relation together forming a substantially continuous belt-receiving channel adapted to engage a V-shaped belt, means for expanding said rim member, the expansion of the spring inner section of said rim member acting to vary the effective diameter of the belt-receiving channel formed by said arcuate flanged sections and means for restraining movement of said rim member in an axial direction.

4. An expansible pulley structure according to claim 3 in which the bases of said flange sections are formed severally intermediate the center line of the rim and the. outer edges of said rim.

JACOB R. HERTENSTEIN.

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