US1002930A - Draft-rigging for cars. - Google Patents

Description

' A. P. PRENDERGASTK; J. J. TATUM.

DRAFT RIGGING FOR CABS. APPLICATION FILED 15017.25, 1907. v

1,002,930; I V Patented se t.12,1911.

v Q 9i Q 21 v S E UNITED STATES PATENT O FI ALOIS P. PRENDERGAST- AND JOHN J. TATUIM, OE BALTIMORE, MARYLAND.

I DR.A,FT-RIGGING FOR CABS.

Specification of Letters ratenti Patented Sept, 12, 191 1.

Application filed November 25, 1907. Serial N 0. 403,698.

To cllwhoiiait may concern:

Be itknow that We,ALo1s PQPR NDERGAsT I and Joim'iJ, TATUM, both of Baltimore,

Maryland, have invented a new and useful Improvement in Draft-Rigging for; Cars, which im'provement is fully set forth in the following specification. o

This invention relates .to draft rigging for cars, and more particularly to the manner.

of uniting the;draw-bar on the coupler to the yoke employed for connecting said draw bar to the car.

In our Patent No. 887,751, granted Dec. l, 1906,wehave shown a construction of thischai'acter in which the draw bar and y the arms of the yoke have engaging arcshaped shoulders which alone receive all, the draft strains between the draw-bar and yoke, with a pin passing vertically through said yoke arms and draw-bar and the axis of said shoulders, the pin being free from draft strains.

The present invention is designed as an improvementon thestructure of said patent, and particularly with the view of affording greater flexibility of the parts in a vertical as well as a horizontal direction.

The invention involves certain features of' construction and combination of parts which will be hereinafter more specifically described and then pointed out. in the claims.

While the inven'tiveidea involved is capable of embodiment in a variety of mechane ical structures, we have'illustrated in the accompanying drawings the best embodiment with which we are familiar, in which drawings' Figure 1 is a broken vertical section; Fig.

-2 is a sectional plan, the draw-bar head being shown in full lines; Fig. 3 is a broken perspective of the yoke and the draw-bar perspective of,

head; and Fig. 4 is a broken the draw-bar headv alone.

Referring to the drawings, in which. like reference numerals indicate correspqlldillg parts, 1 is the draw-bar-, 2 is the yoke, the arms of which areconnected by a bridge wall 3 whose face 4 adjacent to the drawbar head 5 is formedlike the concave surface of a portion of a sphere, the outer end 6 of the draw-bar head being formed like the convex portion of the: surface, of a sphere correspondinghtothe concave surface 4: of the bridge wall 7, 7 are the draft shoulders, here shown as undercut on the inner faces of the ends of the yokearms, and 8, 8, are corresponding undercutdraft shoulders on the dran= bar head and facing in the reverse-direction ,to the shoulders 7 on the yoke, said shoul ders 7 and 8 being a portion of the surface of a sphere whose center is in pin 9 passing through an oblong hole 10 formed in the draw-bar between the head of said drawbar and the couplerhead, said pin serving to prevent the lateral separation-of the yoke andbar, but being free from draft strains,

faces of the head'of the draw-bar lying between the armsof the yoke areslightly beveled, as-shown at 11, 11, Fig. 1. It will be seen that by this construction notonly does the draw-barhead have sufiicient layto'aiford flexibility of the parts in a horizontal direcnu s. s ne e a y en: h rain is passing around curves, but in addition thereto, thedraw-bar has limited play in a vertical plane such as would occur when two cars whose couplers are inslightly different horizontal planes are to be-coupled-together.

By reason of the oblong shape-of the perforation or hole 10, the vertical play of the coupler bar occurs without any strain uponpin 9, and since allthe draft? strains are taken up .by the engagement; of the shoulders 7 and 8 on the yoke and draw-bar: respectively, andthe bumping-strains; are taken up between, the spherical surfaces. 4V and 6 on.

the,,bridge 3 and the head 5 respectively, it w ll ese n hat th mo t flexib ity tthe parts is. secured without imposing any draft or other strains upon the .pin 9, except such as are merely required to prevent lateral relative movement between the draw-bar and the yoke such as occur when the 'parts are to be. disamembled.

What we claim is 1. In a draft rigging for cars, the "combination of a draw-bar having a head whose end forms a portion of the convex surface of a sphere, and upwardly and downwardly, projecting shoulders on either side of said head, with a yoke whose arms are united by v surface of a sphere, with a yoke having in-.

wardly projecting shoulders engaging the shoulders on the draw-bar head, and a bridge wall located between the closed and open ends of said yoke and uniting the arms thereof, the surface of said wall adjacent to the draw bar head being the concave surface of a portion of a sphere, and a pin passing through the. ends of the yoke arms and the perforation in the draw-bar.

3. In a draft rigging for cars, the combinationof a draw-bar having outwardlyprojecting shoulders provided with an. oblong per oration, the end of the draw-bar headforming part of the convex surface of a sphere, whose center is located within said perforation, a yoke having inwardly projecting shoulders engaging the shoulders on the draw-bar head and provided with a bridge wall connecting the arms of the yoke,

the surface of the bridge wall adjacent to the draw'bar head forming a part of the concave surface of a sphere whose center is also withinsaid perforation, and a pin passing through the ends of the yoke-arms and said" perforation.

,4. In adraft rigging fon cars, the combination of a draw bar having outwardly projecting curved shoulders and an oblong perforation,-the end of the draw-bar-hea-d forming a part of the convex surface of a sphere,

and the draw-bar head being slightly beveled on its upper and lower surfaces, with a yoke having inwardly projecting curved shoulders engaging the curved shoulders on the draw-bar, the arms of said yoke being connected by a brid oblong e wall whose surface adjacent to the drawar head forms a part I of the concave surface of a sphere, and a pin passing through the ends of the yoke-arms and the perforation in thedraw-bar.

5. In a draft rigging for cars, the combination of a yoke whose arms are connected by a bridge wall, one .of whose surfaces forms part of a concave surface of a sphere,

the arms of said yoke being provided with inwardly projecting curved shoulders, a draw-bar having a longitudinally extending perforation and provided with a head which latter fits loosely between the arms of said yoke, and having curved shoulders engaging the said shoulders on the yoke-arm, the end of the draw-bar head forming a part of the convex surface of a sphere and lying adjacent to the concave spherical surface of said bridge wall, and a pin passing through the ends of the. yokearms and the longitudinally extending oblong perforation in the draw-bar.

6. Ina draft rigging for cars, the combinationof a draw-bar having upwardly and downwardly projecting shoulders on either side thereof, the surface of each of said shoulders forniing a part of the surface'of a sphere, with a yoke having inwardly projecting spherical shoulders engaging the shoulders on the upper and lower sides re-,

spectively of the draw-bar.

7. In a draft rigging for cars, the combination of a draw-bar having a head whose end forms a portion of the convex surface of a sphere, and upwardly and lownwardly projecting concave spherical shoulders on either side of said head, with a yoke whose arms are united by a bridge wall having a face constituting a part of the concave surface of a sphere, said yoke. having inwardly projecting convex spherical shoulders engaging the concave spherical shoulders on the draw-bar head.

In testimony whereof we have signed this specification 1n the presence of two subscribing witnesses.

ALOIS P. PRENDERGAST. JOHN J. TATUM. Witnesses-.1

. Arum CARRICK, Geo. W. CARRICK.

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