US643699A

US643699A - Combined belt-pulley and spring.

Info

Publication number: US643699A
Application number: US71665699A
Authority: US
Inventors: Frank Van Duzen
Original assignee: Individual
Current assignee: Individual
Priority date: 1899-05-13
Filing date: 1899-05-13
Publication date: 1900-02-20
Anticipated expiration: 1917-02-20

Description

No. 643,699. Patented Feb. 20, |900. F. VAN DUZEN.

COMBINED BELT PULLEY AND SPRING.

(Application led May 13, 1899.)

(No Model.)

Ivfl llllllllllll1jlllflll Ill/11111111111111111111 rrn Terras FRANK VAN DUZEN, OF MARION, OHIO.

COMBINED BELT-PULLEY AND SPRING.

SPECIFICATION forming part of Letters Patent N o. 643,699, dated February 20, 1900.

Application iiled May 13, 1.899. Serial No. 716,656. (No model.)

T0 @ZZ whom, t may concern:

t Be it known that I, FRANK VAN DUZEN, a citizen of the United States, and a resident of the city of Marion, in the county of Marion and State of Ohio, have invented certain new and useful Improvements in a Combined Belt- Pulley and Spring, of which the following is a specification.

My invention is primarily designed for use in connection with pulleys started, run, and stopped by a friction-clutch of some kind. Nevertheless my improvements are applicable to belt-pulleys where the motion imparted to them either through their shafts or through their belts is of an irregular or inconstant character.

The several features of my invention and the various advantages resulting from their use, conjointly or otherwise, will be apparent from the following description and claim.

In the accompanying drawings similar letters of reference indicate corresponding parts.

For the purposes of full illustration I have shown in the drawings my invention as applied to a belt-pulley operated by a frictionclutch.

In the drawings, Figure 1 is a side elevation of such a belt-pulley provided with my invention. Fig. 2 is a vertical transverse central section of the mechanism shown in Fig. 1. This section is taken in the plane of the dotted line 2 2 of Fig. 1. That face of the section is shown which faces toward the right hand in Fig. 1. Fig. 3 is a central longitudinal section of a portion of the mechanism illustrating certain features of my invention, such ligure being shown on a scale about three times as large as that on which Figs. 1 and 2 are drawn. Fig. I represents a bottom view of the mechanism shown in Fig. 3 and on the same scale therewith. In connection therewith I have shown by dotted lines the mode wherein the right-hand end of the device is connected to the wheel. Fig. 5 represents a This figure is on the same scale as I will now proceed to describe my invention in detail.

In order to fully describe all of the features ot' my invention, I must specify the combination of the latter with the belt-pulley wheel and friction device. I have therefore selected a belt-pulley wheel of that kind which is provided with a friction-clutch. There are various descriptions of friction-clutches'. Frein among these I have chosen one of a simple construction.

A indicates a belt-pulley-wheel shell. This consists of the belt-driving peripheral circumferential portion A2, against which the belt lies, and of the inner sleeve-shell portion A3, concentric with the circumferential portion A2, and of the spokes or radial extension or bracing A4, whereby the outer portion A2 is connected to the inner portion A2. The inner shell portion may be considered in the nature of a hub relative to the spokes A4 and outer circumferential or felly part A2 of the wheel. Within this hub A3 and concentric therewith is a shell B, arranged to rotate close to but loosely within the hub AS. The wheel A is in the present illustrative instance supported on and by the shell B. The shell B in turn embraces a split sleeve O or expander, duly supported on and substantially concentric with a shaft. (Not shown.) This friction-sleeve is provided with suitable mechanism, (not shown, but well understood,)where by at the will of the operator the frictionsleeve binds the shell B and compels the latter to be one with it. If the shell B was in one with the hub A3 of the belt-pulley shell A, then when the pulley-shell A, through the agency of its driving-belt, was running and the expander-sleeve O was clutched with the shell B the expander-sleeve C and its shaft would forthwith be compelled to run at the same rate of speed as the belt-pulley shell A. On the other hand, if the shaft of the eX- pander-sleeve C was the driving agency and the sleeve O was running, then whenever the expander-sleeve C was clutched to the shell B the belt-pulley shell would be compelled instantly to rotate with the expander-sleeve C and at the same rate of speed. In both of such modes of starting the parts of such mechanism which are at rest there follows a rude IOO and injurious shock to the parts, often resulting in a breakage of the parts and always causing much wear of the portions between which friction occurs-viz., between the expander-sleeve C and the shell B and between the peripheral belt-surface of belt-pulley shell A and the belt thereon.

One of the principal objects of my invention is to obviate such injurious shocks and such rapid wear of the frictional parts aforementioned.

I provide a cylindrical body or tube D, and within this I duly locate a spring E. The latter is preferably a metal one and of the kind known as a coiled spring. The body or tube D has on one end a head F and on the other end a head G. Both of these heads are duly secured to the body or'tube D, preferably by the well-known means of screwthreads, substantially as shown. In this event the exterior of these heads or caps will be sided, so as to afforda hold for a wrench to rotate them in applying or removing'them. The head G is pivotally connected to an extension or arm B2 of the friction-shell B, and this arm avoids the hub A3, substantially as shown. The preferred means for connecting the head G to the arm B2 are as follows: The head has a yoke having the side pieces or ends G2 G3. Between these side pieces is received a port-ion B3 of the arm B3. This portion B3 is pivoted at B4 to the side pieces G3 G3. Thus the head G and the body or tube D as one is free to oscillate on this pivotal connection. In the head F is a central opening F2 and in the head G a central opening` G3.

Through the cylinder extends a rod H, and the latter extends beyond the head F and to the right of the head, as shown. To its right hand is secured a bearing H3, preferably an eye, for connecting it pivotally to a spoke A4 or equivalent portion of the belt-pulley wheel A. This bearing H2 is preferably secured to rod H by a screw connection. This eye H2 is located between two pieces or cheeks A5 A5, provided therefor on a spoke AA1 or equivalent portion of the belt-pulley wheel A, and a bolt H3, passing through the eye and these cheeks, pivotally connects the two.

In passing it is to be remarked that the bolts B4 and H3 are respectively held in place bya split key in the well-known manner of using the latter.

An elongated rectangular opening H4 in the bearing H2 affords a convenient means for enabling the bearing H3 to be screwed upon the end of rod H or to be unscrewed therefrom or to be adj usted to a desired place upon the rod.

On the left-hand (free) end of the rod His a flange or shoulder M, preferablyin the form of a rounded bolt-head. Vithin the cylinder D and adjacent to the shoulder M is a perforated disk, ring, or washer N. This ring N embraces the rod II, substantially as shown. The ring is larger than the diameter of the opening in the cylinder-head, and therefore overlaps the sides of the cylinder end and cannot pass through said opening. It is also large enough to serve as a bearing for the left-hand end of the spring E. At the other end of the spring E and within the right-hand head of the cylinder D is a ring K, forming an abutment, against which the spring abuts and bears. This abutment is fixed by suitable means, so that it shall reciprocate with the rod H. A preferred means of accomplishing this result is shown, and consists of the sleeve J, embracing the rod H and extended between the ring K and the end of the bearing H2 and abutting against the latter. That end of this sleeve J which is in contact with the ring K is preferably integral with the latter. \Vhen the rod H and the rings N and K are respectively in the positions shown in Fig. 3, the spring there normally fills the entire cylinder D. Vhen the rod H is moved toward the left, the ring K pushes that end of the spring which is adjacent to it toward the left and compresses the spring between it and the abutment-ring N at the other end of the cylinder. Vhen the rod II is moved toward the right, the Harige M moves ring N toward the right, and the latter moves that end of the spring which is adjacent to it toward the right and compresses the spring between it and the ring K at the other end of the cylinder. Obviously the elastic resistance of the spring tends to return these several parts into the positions shown in Fig. 3 as soon as allowed to do so, and the spring being apowerful one forcibly exerts its power to accomplish this last-named result.

Thus constructed and combined the operation of my device is as follows: When the eX- pander has fixed the friction-shell to the hub of belt-pulley, then if the driving-shaft connected to the expander be rotating and rotating in the direction of the arrow S the beltpulley will start forward. Of course the inertia of the belt-pulley, belt, and all that it operates is to be overcome. At this point the advantages of my invention are realized. The friction-shell, through the agency of the arm B3, forces the cylinder D forward. As the belt-pulley A is yielding more slowly the cylinder D colnpresses the spring within it and the rod H projects out of the rear end of the cylinder D and passes through the opening R in the arm B3. At the same time the bearing H3 approaches the cylinder D. .As the spring within the cylinder is compressed its resistance to further compression increases, andit gently but more forcibly urges the belt-pulley forward. In this way the beltpulley is started into motion in a comparatively gentle manner and without jar or injury to any of the mechanism.

Should the driving-shaft travel in the opposite direction, then when the expander fixes the friction-shell to the belt-pulley the spring will be compressed in a reverse direction and the distance between the cylinder D and the bearing H3 will be increased. Should the belt-pulley wheel receive its driving power IOO IIO

through its belt, then when the expander through the friction-shell B iiXes the latter to the shaft, if the belt-wheel be moving in the direction of the arrow S, the first movement of the belt-pulley will be to draw the bearing H2 away from the cylinder D and compress the spring between the right-hand end of this cylinder and the flange or abutment on the free (left hand) end of the rod H, and thus elastically and gently communicate motion to the shaft A in the direction of the arrow S. On the other hand, if the belt-pulleybe moving in a direction the reverse of that in which the arrow S points and the expander fixes the shaft to the friction-shell B the belt-pulley will move the cylinder D toward the bearing H2 and compress the spring between the lefthand end of the cylinder and the abutment or shoulder. Thus the shaft will be set in motion gently and without jar. It is also to be observed that in all of these aforementioned instances after the shaft and belt-pulley have been started and are running together should any sudden impulse be given to that part which is the driving power-viz., either the shaft or pulley, as the c ase may be the spring mechanism will elastically receive this impulse and neutralize its jar while conimunicating the impulse to the parts it is rotating. Conversely, should the speed of rotation of those parts which are driven be for anyreason quickly diminished the jar which would be imparted to the driving power is greatly softened and usually altogether neutralized by the intervening` action of the spring;

When desired, the position of the resilient mechanism between the arm of the frictionshell and the belt-pulley may be reversed. In such event the bearing H2 will be connected to the arm of the friction-shell and the cylinder D be connected to the belt pulley. Those parts of the shell and of the pulley which are thus connected to the resilient mechanism willbe suitably adapted to receive such connection.

I have shown but one arm and but one spring in the drawings; but I do not wish to limit myself to one set of these devices in connection with a spring-pulley and friction-gear. Onthe contrary, I expect frequently to use two or more sets of such devices in connection with a given pulley. Two of such sets, respectively located at opposite sides of the hub, are desirable, because they counterbalance one another, whereas when one set alone is used it has a tendency to draw the pulle out of balance.

What I claim as new and of my invention, and desire to secure by Letters Patent, is-

The combination of a friction-shell,a powerwheel having a hub loosely mounted on the shell, said shell having a radial projection, a cylindrical body, a spring inclosed within said body, and adapted to be compressed according to the direction of the movements of the aforementioned parts, and a rod partially inclosed by said body and attached at one end to the power-wheel and carrying abutments between which the spring is contained, substantially as and for the purposes specified.

FRANK VAN DUZEN.

Attest:

J. W. KNAPP, V. E. DOMBAUGH.