' H. L. BLODGBTT.
SASH CORD GUIDE.,
No. 329,005. Paten-ted Oct. 27,1885.
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HENRY L. BLODGETT, OF OHIOAGO, ILLINOIS.
SPECIFICATION :forming part of Letters atent No. 329,005, dated October 27', 1885.
To all whom it may concern:
Beit known that I, HENRY L. BLoDenTr, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sash-Cord Guides; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form apart of this speciiication.
The primary object of this invention is to produce a construction in sash-cord pulleys in which the case may be provided with a faceplate or flange of circular form and of diameter small enough to entera single sash-groove, while at the same time the pulley-shell (which of course cannot exceed in height the diameter of the face-plate) may afford the desired distance between the vertical parts of the cord. By such a construction the pulley-shell may have the positive support of a face-plate, and the said faceplate may be let into the jamb by a bit-cut, which insures neatness and accuracy of tit with the least possible labor.
Another object of the invention is to provide a construction of the pulley/wheel whereby the latter will be rendered nearly or quite noise'A less in its operation.
To these ends the invention consists in the matters hereinafter set forth, and pointed out in the claims.
In the drawings, Figure l is a perspective viewofasash-pulley ccntainingcertainfeatures of myimprovement. Fig. 2 isa vertical section transverse to the aXis of the wheels of the sash -pulley shown in Fig. 1 applied to the window-jamb. Fig. 3 is a rear view of asashpulley constructed in accordance with my improvements. Fig. 4 is a side elevation of the case pulley having the circular face-plate eX- tended above the case, asshowninFig. 3. Fig. 5 is a vertical section of the case through the axis of a pulley-wheel, showing devices having referenceto the noiseless action of the pulley on its axis. Fig. 6 is a side view of one of the pulley-wheels having the last-mentioned improvement detached from the case. Fig. 7
is a perspective view of one of the small disks applied to opposite sides of the pulley around its aXis detached. Fig. 8 is an axial section of the pulley containing the last-mentioned feature of constructiomalso detached from the case.
Referring to the drawings, A is a tubular portion of the case, and A the circular faceplate cast therewith. Said face-plate is made circular in order that the recess made in the jamb to receive it may be cut with a centerbit with little trouble and perfect accuracy. Said face-plate is, moreover, small enough in diameter to allow of its being inserted between the stops which form the walls of the same sashgroove. The tube A is therefore necessarily vertically shallow, and to givethe desired distance between the vertical parts of the cord two small pulleys, B B', are mounted in the shell, one behind the other, as shown. These pulleys are usually of equal diameter, and have their axes b in the same horizontal plane. The case A has its upper and lower edges, a c', semi-cylindrical, whereby the aperture in the jamb to receive the tube may have its upper and lower ends cut by means of a bit of proper dimensions to enable the case to fit the aperture closely, the central portion of said aperture being taken out bya chisel in the usual manner. A special desirability of ya close fit of the tube in the jamb arises in the construction shown from the less leverage of the faceplate by reason of its being shortened in proportion to the lessened vertical diameter of the tube A,and the close fit of the tube in the jamb will contribute to the security of the case or shell against the force of the weight suspended from its inner and overhanging pulley, B.
The shell A. may desirably be constructed of greater length than is usually required for a given medium or small size, and may have its hinder portion cut away at a2, as shown, so that the inner pulley, B', may be set in diferent positions-i e., either nearerl to or farther from the pulley B, which is always set in proper position to allow the cord to clear the face of the window-jamb. By this construction the same shell A may be employed for different thicknesses of jamb or for different forms of weight, or for varying conditions as to the weight-chamber in the window-frame.
In the use of the two relatively small pulleys B B the faceplate, of proper width to be inserted between the stops, or, in other words, of width not greater than the thickness of the lOO window-sash, may exceed the vertical depth of the shell A, and in this case I prefer to extend the face-plate above the shell A, in the manner indicated in Figs. 3 and 4, in order that the upper projection may cover any space inadvertently left by inaccurately forming the aperature therefor in the jamb, and also for the purpose'of forminga shoulder atthis point calculated to better support the shell against the downward strain of the weight'frorn the rear pulley, B. rIhe screw-holes a3 in the circular face-plate A are located at the sides of the shell, as indicated in Fig. 3.
For the purpose of rendering the movement of the pulley noiseless, said pulley is cast with a central recess, b2, around the axial aperture b', and a centrally-apertured disk, B2, Fig. 7,0f Babbitt metal, rawhide, or other suitableinaterial, and of proper size, is set in said recess b2,- as shown. Preferably the disk is forced into place, and, thus fastened to the pulley,will
always turn with it and furnish an anti-friction, or, at least, a noiseless, bearing-surface when brought into contact with the side walls of the shell. By making the disks B2 of proper material and forcing them into the recesses b2, as described,so as to turn with the pulley, they form also a wearing-surface on the pivot-pin b calculated to support the pulley properly on its axis as though the said pulley were constructed of a single piece of metal of the full width,presented in the present instance by the metalof the pulley proper and the thickness of the disks.
By reason of the greater rapidity and number of revolutions on the part of the smaller pulleys,B B', in the duplex construction herein shown, and resulting from the less diameter of said pulleys, the presence of the noiseless or anti-friction disks B2 is especially advanta- 4o geous in the form of pulley devices herein described.
It is obvious that in the construction set forth a minimum area of faceplate and pulley will be presented to the eye; that the strength and the lower to a point above the upper edge of the shell, said face-plate having diameter small enough to permit it to enter a single sashgroove, substantially as described.
2. In combination with a shell, a pulley recessed about its axis, and aplate or disk insert ed in the recess of greater thickness than the depth of the recess, substantially as described.
In testimony that I claim the foregoing as my invention I aiix my signature in presence of two witnesses.
HENRY L. BLODGETT.
M. E. DAYTON, W. C. ADAMs.