US1644164A - Pulley - Google Patents

Description

Oct. 4 1927.

E. M. ADAMS PULLEY 2 Sheets-Sheet l Filed Sept. 4 1925 Edward M. fidams 5y Oct, 4,1927. 1,644,164

' E. M. ADAMS PULLEY Filed t, 4 1925 2 Sheets-Sheet 2 Patented Oct. 4, 1927.

UNITED STATES- EDWARD M. ADAMS, OF LENNOXVILLE, QUEBEC, CANADA.

PULLEY.

Application filed September 4, 1925.

This invention relates generally to improvements in rope pulleys and more particularly to light duty pulleys, such as are used for clothes lines and the like, and the object of the invention is to provide an inexpensive, durable and efficient pulley.

. A further object is to provide a pulley having the frame so constructed that a rope travelling in the sheave is positively held against escape from the groove of the sheave and also from binding between the sheave and frame. I a

A still further object is to provide a pulley of this type in which'the frame is composed of wire in sections easily manufactured and assembled.

Various other objects and the advantages of the invention may be ascertained from the following description.

' A pulley formed according to this invention comprises essentially a grooved sheave pivotally mounted in a frame composed of two similar sections connected to one another and to a strap member by which the pulley is suspended.

In the accompanying drawings 'which illustrate one embodiment of the invention and one of many possible modifications;'-

Fig. 1 is a side elevation of the pulley.

Fig. 2 is a plan View thereof. v a

Fig. 3 is airedge elevation,

Fig. 4 is a perspective View of one of the frame members. p I

Fig. 5 is an elevation of the strap member.

Fig. 6 is a fragmentary plan view showing a slight modification.

Referring more particularly to the drawings, 11 designates a grooved sheave of wood or other suitable material, mounted in a frame composed of a pair of similar memhere 12 and a strap 13. The sheave is rotatably mounted in the frame by means of a spindle 14 and is held from rubbing on the frame and strap by washers or a hub, designated 15.

- Each of the frame members 12 is formed of a piece of heavy wire or light rod bent to the form shown in Figure 4. The wire forming the frame member is in the embodiment illustrated bent as. follows :At one end a loop or eye 16 is provided. The wire Serial No. 54,459.

18 and, at the opposite end of the semicircular portion from the loop 16, the wire is bent to form a loop 19. The loops 16, 18 and 19 are formed inside the curve of the semicircular portion, as clearly shown, and each loop is of substantially the same internal diameter as the external diameter of the wire itself. From the loop 19 the wire extends in a substantially straight portion 20 to the loop 16 and is bent approximatel at right angles at 21, so as to pass throng the loop 16. Midway of its ends, the straight portion 20 is formed into a depending loop 22 of a size to tightly hold the spindle 14. Beyond the loop 16 the wire is bent at approximately right angles, as at 21', in the opposite direction to the bend 21, the two bends being so closely spaced that the loop 16 is held tightly between them. Beyond the bend 21*, the wire is bent in substantially semicircular form, as at 23, the portion 23 lying in a plane at right angles to the plane of the portion 17. Beyond the semicircular portion 23, the wire is'bent at approximately right angles, as at 24, and then continuesfor a short distance in a straight line to its extremity, thus forming a straight portion 25 approximately at right angles to the straight portion 20 and in axial alignment with the eye 16.

The strap'member 13 comprises a piece of wire bent to approximately U-shape at its centre to form a large loop26, by means of which the pulley may be suspended from a hook or the like. Beyond the loop or U- shaped portion'26, the two arms 27 of the wire are offset outwardly, as at 28, so as to space the two arms sufiiciently apart to receive the'pulley sheavebetween them. These arms then extend in an approximately straight line to nearly their extremities,

where they are bent sharply toward one an- 2 other, as at 29. The distance between the offsets 28 and the inturned ends 29 is slightly greater than the diameter of the pulley sheave. Midway between the offsets 28 and the inturned ends 29 the strap arms 27 are bent into loops 30 of a size to receive the spindle 114.

Theelements of the frame and thesheave 'may, beassembled together in a variety of ways as may be found most convenient. One such method of assembly is to connect two frame members 12 together by passing the extremity 25 of each member through the loop 19 of the other member and then bending the portion (if each member upon the portion 20 of the other member, as illustrated at 31, Figures 1 and 2. This method of assembly forms a frame adapted to en'- circle the pulley sheave slightly above what may be termed its horizontal diameter, as will be seen in Figures 1 and 2. l/Vhen the frame is properly proportioned to the sheave, the loops 16 and 19 lie inside theplanes of the sheave flanks and so close against the outer edge of the sheave flanges as to prevent a rope climbing out of the sheave groove from entering between, the sheave and the frame members 20. The portions 23 of the frame form keepers to retain a rope on the sheave. The strap member 13 is now passed between the portions 20 of the frame and its lower inturned ends 29 passedinwa rdly through the loops 18 of the frame and bent over as at'32, Figures :5 and e ro make the connection permanent. The strap may now be swung to one end ofthe frame topermit insertion ofthepulley sheave and,then moved into a position at right angles tothe frame portions 20', as clearly shown in Fig tire l. WVhen thus moved, the loops 30 of the strap member will register with the loops 22 of the frame members and the spindle 14 may be passed through all roar loops and through the sheave, washers as indicated at 15 being inserted as desired, or if the pulley hasno hub' projecting beyond flanks. The spindle is preferably a tight drivingvfit the loops 22 and 30 so to inake'the frame rigid. The ends of the spin le now be slightly burred over to hold the same a ainst escape. When th'u's assembled, the offsets 28 of the strap memher he close tothe sheave flanges. and. prevent a rope which may climb either flange from nterlng between the sheave and the strap ,rnennber. I I p p In theembodiment illustrated, the loops 22 are formed Within thesemicircle of the frame, in which casethe frame portions 20 cpcupy' positions above the diameter of the sheave but, it will be understood that this not essential, arid that the loops 22 may be turned outwardly. It will also be seen that both loops30 of the strap member are formed on oiie side thereof, so that the strap member occupies a plane slightly to one side of thelve'rtical diameter of the sheave. This disposition of the loops is purely a matter "6 convenience in bending the wire and it be understood thatthe loops may be turned in opposite directions if desired. The loops 16, 18 and 19 are formed within the semicircle of the frame, principally to impart a smooth outer edge to the frame, and it will be understood that this inward ttirning of the loops is not essential but may be departedfrom andthe semicircular portions 17, thereby brought closer to the periphery of the sheave.

In Figure 6, there alienate a slight modification of the frame meinh'ersin' which the part 23 corresponding to the part 23 of Figure 2 is turned inwardly instead of outwardly, as in Figure 2, for the purpose of confining a rope more closely to the groove of the sheave. Such a formation of the frame will not permit the passage of a knot or other enlargement on the rope, such as would pass through a name formed according to Figure 2.

From the foregoing description, it; understood that the invention is not con? fined to the details of the embodiment illus trated but is capable of modification in a ariet-y of ways as may be convenient or'expedient in manufacture and use, andftlrft all such modified forms as fall within the scope of the appended cranes are deemed to be included in and to"fo rm a part of the invention. I I w A Having thus described my invention, What- I claim is I,

1. In a device or the class ae cribedya sheave and a frame enclosing the sheave comprising a pair of members, each formed of a single piece of wire bent to'sern'ici rciilar shape and provided at the ends and centre of the curved edge thereof with ldop's, said wire beii'igpassed adjacent one of'i'ts erids thr'oi'iglr a loop formed at the other er'rd and leaving a'pr'ojecting' portion adapted forms'rtion through a loop of the otherrneinber, a strap member connected at its ends to said similar members, all three of said frame members being anned with nope" for the passage of a spindle to si'ipport the sheave;

2. In a device of the class described, a sheave and a frame comprising three members, two of which are sinner and formed of wire, each including a sei'nicirciilar porti on, loops at the ends, and centre of s'iich semicircular portion, a straight portion havmg a loop at its centre and eitending from are sh'oil'lder' passing throngh an end loop of the other of the two members, and a strap member secu ed at its ends in the centre loops of the semicircular portions and formed to provide apertures in register with the centre loops of the straight portions of thefirst named members for thepassage of a" spindle, and a spindle passing throngh the loops of the frame members and the, apertii're of the strap member and throngh the sheave and connecting the strap member and trains members and rotatably siippdrting the sheave.

3. In a device of the class dscribed,.a grooved sheave and frame enclosing the sheave formed of wire, said frame projecting inwardly of the planes of the sheave of the'sheave to hold a rope in the sheave groove against climbing out of the groove and entering between the flanks of the sheave and the frame.

4. In a device of the class described, a grooved sheave and a frame enclosing the sheave comprising a pair of semicircular members of slightly greater diameter than the sheave and located in planes slightly inside the planes of the sheave flanks whereby said members constitute a guard beyond the periphery of the flanges forming the sheave groove, a pair of substantially diametrically arranged members each connecting the ends of one of the semicircular members, said diametrical members being located outside the planes of the sheave flanks and each provided with an aperture midway of its ends, each of said semicircular members being formed integral with one of the diametrical members and constituting a frame member, connecting means extending between the frame members at the ends of the diametrical members and each formed integral with one of the members and inserted through an aperture of the other member, each of said frame members with the attached connecting member being formed of a single piece of wire, and a strap member presenting apertures in ali nment with the central aperture of the iametrica'l frame member portions, said strap member being bent at its ends around the semicircular frame member portions, and a spindle passing through the strap member and frame member apertures and connecting the same together and supporting the sheave.

In witness whereof, I have hereunto set my hand.

EDWARD M. ADAMS.

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