US944327A - Railway draft-gear. - Google Patents

Description

R. A. FRENCH &. L. T. GIRDLBR.

RAILWAY DRAFT qua. APPLICATION FILED OUT 24, 1906 Patented Dec.28,1909

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INVE TOR wrrussses R. A. FRENCH & L. T. GIRDLBR. RAILWAY D FT GEAR.

APPLICATION I D OCT. 24, 1906. 944,321 Patented Dec. 28, 1909. sums-sum 2.

R. A. FRENCH & L. T. GIR'DLER.

RAILWAY DRAFT GEAR.

I APPLICATION I'ILED OUTM, 1906 IIIIIIIIIIIIHHH'H I I II l i izyl lll wrmsssss I mvsu'rons.

m. Ami-Lasts COPY Sineeifieation of Letters Eatent.

D LOUIS T. GIRDLER, OF SEWICKLEY, PENNSYL- & MANUFACTURING 00., OF PITTSBURG,

N ENNSYLVANIA.

A 5.3' DRAFT-GEAR.

Patented Dec. 28, 1909i.

@eteber 24, 1906. Serial No. 340,345

e class of draft a fear hav- 1 applye springs through a l l N equalize the piesao away with stops, l having two exerting a radial ethe form of i av; bar, UllUA'til. conical spi idea) with their ends, and more at :9 and.

(huddle son l'iear up ably reev face of the core are true cones, the coils nearest the small end of the cone will reeeive the greater radial strain, owing to their reater travel during the stroke. Inasniue li the radial strain will cause a peruianent set in the coils it carried beyond the elastic limit, it is therefore necessary in such a form to so proportion the parts that the radial strain will not exceed the elastic limit in the coils nearest the small end of the cone. Consequently the strain upon the coils nearer the large end of the cone, must be far below the elastic limit, thus decreasin the resistance. lVe have overcome this diilieulty by curving the surface of theconical member instead of making it a straight or true conical form. By making this curve sharper near the larger end of the cone and flatter near the small end, We can con'ipensate for the greater travel of the smaller diameter coils, and cause a substantially uniform bursting strain upon all the cells. This may he used either upon a tandem TIQOIIH, as shown in Fig. 1, or a single spring form, as shown in Fig. 2. Thus in l igr. Q2, 2 is the yoke, 3 the draw bar, 4* the front follower 2111C 5* the rear follower. The front follower is provided with the core which is preferably cylindr' all or slightly, tapered in the part 8, while the remainder l0 is of general conical form, but with the surface curved preferably in some hyperbolic form. ln this case, the spring 7* hears at one end against the follower 4", and at the other end agaii'lst the filler plate 11 whirl: recessed and provided with a central hole to receive the end of the core.

in all the forms we prefer to provide sufiicient clearance space between the spring or springs and the core, so that there will he no friction or radial strain through the first part of the stroke in either direction; 95 while during the latter part of the stroke, the core exerts its radial pressure upon the several coils of the spring during their closlug against each other.

Fig, 3, we show a form substantially 100 like Fig. 1, except that the cones are. reversed in position, their larger ends being at the outer ends of the springs. In this form, parts similar to Fig. 1 are marked with .t' ar name ads with the letter b ap- 105 in such. case the filler plates Ll at the outer ends of the springs may bedone away with, and the ring 12 between the adjacent ends of the springs is preferably recessed to form seats, and provided with a central hole toi'eceive the ends of the conical cores. By the words conical or F cone in the specification and claims, we intend to cover a core having a ,decreasing cross-section whether its surface is in straight lines or curves.

The advantages of our invention result from the simplicity and compactness of the device and the great increase in' resistance due to the radial pressure of'the core. By

changing the angles of the core ti} the spring or springs we can vary the reslstanc'e and exert the radial pressure through the cue tire stroke or any desired part thereof.

Our device may be employed for a yielding resistance in ordnance or for other locations where such resistance is desired; andby the term draft-riggin in our 5 ecifi cation and claims we inten to cover al such forms whether pressure is applied in one or both directions. The feature ofcompensating. for the greater stroke of some of the coils may be used with either single or tandem springs, and many other changes may be made without departing from the spirit and sec e of our invention.

We 0 aim 1. In a friction device for draft riggings and other purposes, a longitudinal spiral conical spring, and a conical device, one of said parts fitting over the other to exert a radial pressure upon the spring, the conical device having portions of its frictional 's'urface of different pitch; substantially as described. v l g 2. In a friction device for draft riggings and other purposes, a. longitudinal spiral spring, and a conical device in position to engage the spring and arranged to exert av radial pressure thereon, said device decreasing in diameter in different ratiosin different parts thereof to compensate for the greater stroke of some of the coils; substan tially as described.

'3. In a friction device for draft riggings and other" purposes, a longitudinal s iral spring, and a conical core coacting t ere- With and arranged to exert a radial pressure thereon, said coredecreasing in diameter to a greater extent at its larger portions than at its smaller portions to compensate for the greater stroke of the coils' near its smaller end; substantially as described.

' 4. In a friction device for draft riggipgs and other purposes a longitudinal spiral spring, and a conical core within the sprin and coacting therewith to exert a radia pressure thereon, the face of said cone being curved longitudinally; substantially as de-' scribed.

- 5. In a draft rigging, apair of spiral springs having spaced-apart coils and arranged in tandem, and a pair of conical devices coacting with the springs to exert a radial pressure thereon both on bufiing and pulling strains; substantially as described.

6. In a friction device for diaft riggings to exert a radial pressure thereon; substan tially' as described.

'7. In a fllctlOli device for draft riggings and other pufiposcs, a pair pf spiral springs.

having space apart coils and arran ed in tandem and each having decreasing iameter's' toward one end thereof, and apair of conical cones coacting with the springs to exert a radial pressure thereon, the surfaces of said cones decreasing in diameter to different amounts through the different portions thereof to compensate for the greater stroke of the coils near the small ends of thesprings; substantially as described. 7 v

8. In a friction device for draft ri-ggings and other purposes, a pair of tandem spiral springs of conical shape and having spacedapart coils, said springs having their larger ends adjacent to each other, and a core of' 9. In a friction device for draft riggings and other purposes, apair of tandem sprln s of con calshape having spaced-a art C01 s and having their larger ends a'jacent to each other, and a core of general double conical shape with its largest diameter at its i central portion, said core having a-spacer between the inner ends of thesprings; spbstnntlally as described.

10. In a friction device for draft riggings and other purposes, a pair of tandem spiral 'springshaving spaced-"apart coils, and conipul devices arranged to exert a'fradial pressure upon the springs, said sprin s having 7 a movable hearing at their smaller ends:

substantially as described.

11. In a friction 'device for draft riggings and other purposes, a longitudinal; spiral conical spring, and a. mechanical device arranged to contact with the interior surface of said spring, the bearing surface of the device an the inner bearingsurfa ce of the spring being, of different contours; substantially as described. Q; 1 I

12. In a friction device for draft riggings and other purposes, a longitudinalfispiral spring, and a conical device arranged to contact with and exert a radial. pressure upon the spiral spring, the inner faces of the I coils being curved outwardly with resnect to the axis of the conical device; substantially as described.

13.-A ffrihion device for draft riggipgs and other purposes, comprising two coactlng conical members having frictlonal surfaces arrangerhto vbe brought mto Contact wlth each other, said surfaces beiflg non-parallel v for at least a portion of their length; substantially as described.

In testimony wh reegf, we nu e, heriihfi;

\Vitnesses: v

G120. B. BLEMING, ,JOHN MILLER.

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