Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS485652 A
Publication typeGrant
Publication dateNov 8, 1892
Filing dateMay 23, 1892
Publication numberUS 485652 A, US 485652A, US-A-485652, US485652 A, US485652A
InventorsLouis Pfingst
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 485652 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

(N0 Mbdel.) L. PPINGST.

OAR SPRING-v No. 485,652. Patented Nov. 8, 1892.




SPECIFICATION forming part of Letters Patent No. 485,652, dated November 8, 1892.

Application filed May 23, 1892 To all whom it may concern:

Be it known that I, LOUIS PFINGST, of Boston, in the county of Suffolk, State of Massachusetts, have invented certain new and useful Improvements in Oar-Springs, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being bad to the accompanying drawings, forming part of this specification, in which Figure l is an elevation of my improved carspring; Fig.2, a like view showing the spring partly compressed; Fig. 3,across'-section taken on line :0 a; in Fig. 1, and Fig. 4 aplan view of the rod from which the spring is Wound.

Like letters of reference indicate corresponding parts in the different figures of the drawings.

My invention relates to a supporting-spring for railway-cars and similar vehicles, it being designed especially as an improvement on the spring shown and described in my United States Letters Patent No. 462,958, dated November 10, 1891, granted to me for an improvement in car-springs, the object being particularly to render the spring correspondingly sensitive as the load on the vehicle varies.

In the drawings, A represents the spring considered as a Whole. In forming the spring I employ a rod circular in cross-section and of equal diameter from one end 01 to a predetermined point f, preferably at or adjacent the longitudinal center of the rod. From said point f the rod tapers gradually and continuously throughout, its diameter decreasing to the opposite end g, at which point it is of the smallest diameter. That portion h of the rod from the end at to the middle point f of the .same diameter throughout forms the base B when wound, and the taper portion '5 forms the top 0. The rod is wound on a mandrel of equal diameter throughout. This forms a Serial No. 434,044. (No model.)

coil of equal interior diameter, the exterior diameter of the top 0 of the coil gradually decreasing from the base portion to its end, as

best shown in Fig. 2. In this form of spring the top 0 is much stiffer than in the form described in the Letters Patent above referred to, and when the load is applied to it the coils compress successively, beginning at the top, its expansive properties being much the same in efiect as a conical spring, but the graduated stiffness being attained by tapering the bar, as described. Under a light load the top 0 serves to cushion, while the base B resists compression; but before the top has been strained nearits limit said base willbegin to compress, cushioning any increase of load,the top coils assuming the closed position shown in Fig. 2. The base, moreover, being of equal diameter and the upper portion being tapered, as described, the oscillation of the vehicle-body is greatly reduced.

It will be understood that the portions of the rod composing the base and top may be varied in length in relation to each other in any manner desired.

Having thus explained my invention, what I claim is- I A spring comprising a spirally-Wound rod, that portion of the rod forming the lower portion of the spring being of one size throughout and wound with its interior and exterior diameters, respectively, equal throughout, and that'portion of the rod forming the upper portion of the spring being tapered from its point of connection with the lower portion continuously throughout, the interior diameter of the spiral coils of both upper and lower portions being uniform throughout the entire spring and the exterior diameter of the lower portion being greater than that of the upper portion.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2584880 *Dec 11, 1944Feb 5, 1952Chrysler CorpSuspension for railway trucks
US2717559 *Jul 8, 1950Sep 13, 1955Chrysler CorpRailway truck spring suspension
US3331291 *Jul 15, 1965Jul 18, 1967Royal IndustriesEmergency brake actuator
US4377280 *Dec 27, 1979Mar 22, 1983Stahlwerke Bruninghaus Gesellschaft Mit Beschrankter HaftungCylindrical helical compression spring
US4848757 *Jan 25, 1988Jul 18, 1989The Charles Stark Draper Laboratory, Inc.Remote center compliance device with fully or partially coil-bound springs
US5766160 *Jun 6, 1995Jun 16, 1998Target Therapeutics, Inc.Variable stiffness coils
US6254592May 5, 1998Jul 3, 2001Target Therapeutics, Inc.Variable stiffness coils
US6931685 *Sep 12, 2003Aug 23, 2005Dreamwell, Ltd.One-sided mattress
US7178187 *Aug 28, 2004Feb 20, 2007Sealy Technology LlcAsymmetric spring components and innersprings for one-sided mattresses
US7418753 *Aug 23, 2005Sep 2, 2008Dreamwell, LtdOne-sided mattress
US7648563 *Oct 21, 2005Jan 19, 2010General Electric CompanyMethods and apparatus for manufacturing and assembling a baghouse bag filter tensioning assembly
US7814594Aug 29, 2008Oct 19, 2010Dreamwell, Ltd.One-sided mattress
US20110148018 *Jan 18, 2011Jun 23, 2011Dreamwell, Ltd.Asymmetrical combined cylindrical and conical springs
Cooperative ClassificationF16F1/06