US1337002A - Draft-gear - Google Patents

Description

I. F. COURSON.

DRAFT GEAR.

APPLICATION FILED DEC. 11,-19I6. 1,337,002, Patented Apr. 13, 1920.

2 SHEETS-SHEET I.

1 all,

l ff f8 M W4. i5 /a g 7 lf] la' A9 y "5 lu-m "Y: i *I Wicessew: I4 Inv or.

J. F. COURSON.

DRAFT GEAR.

APPLICATION man Dac. 11. 1915.

Patented Apr. 13, 1920.

2 SHEETS-SHEET 2.

.III

I n. l)

W'zesses:

UNITED STATES PATENT OFFICE.

JOI-IN F. COURSON, GF PITCAIRN, PENNSYLVANIA.

DRAFT-GEAR.

nar-races.

Application led 'eccniber 11, 1916.

To all [Li/wm 'it may concern.'

.Be it known that I, JOHN F. ConnsoN, a citizen of the United States, residing at Pitcairn, in the county of Allegheny and State of Pennsylvanimhave invented cer tain new and useful Improvements in Draft- Gears, of which the 'following is a specification.

My invention is an improvement in draft gears of the class utilizing springs and friction shoes and expanding mechanism for the friction shoes, operable on buifing or pulling, to effect resistance to such strains through the mechanism inclosed within an embracing cylinder or casing. f

The particular objects in -view are to provide, in a gear of this type, means for distending the friction shoes toward the casing with frictional engagement proportioned to the strain, utilizing movable elements between a central plunger and the friction shoes, whereby to effect expansion or retraction of the shoes coincidental with pressure and release movements. rlhese elements operate in the manner of tightening and loosening bearings of the toggle joint type. l

The several objects are accomplished in certain preferred forms of the apparatus, as more fully hereinafter described and illustrated in the accompanying drawings, in which Figure 1 is a longitudinal vertical sectional view through a complete gear as assembled, the parts being shown in normal extendedy position. Fig. 2 is a similar view, showing the parts in compression, either in buiiingv or pulling.

Fig. 3 is a cross section on the broken line III, IH of Fig. 1.

Fig. i is a perspective" detail view of the central pressure bar.

Fig. 5 is a similar view of one of the friction shoes.

Fig. 6 is a similar view of one of the in tervening movable' lpressure exerting and transmitting members.

Fig. 7 is a view similar to Fig. 1, showing a modied construction, iii-relaxed or normal position.

Fig. 8 is a similar view, showing the parts in compression.

Fig. 9 is a detail perspective view of one of the friction shoes as used in the gear of 7 and 8.

Fig. 10 is a similar view of one portion ySpecification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 136,142.

of the centrally arranged compound pressure bar.

Fig. 11 1s a cross sectional view on the im@ in, in, of rig. 7.

Fig. 12 is avperspective detail view of one of the intervening movable pressure exerting and transmitting members used with the `construction of Figs. 7 and 8.

y -Fig. 13 is a sectional detail view showing the face of one of the compound pressure bar members having a rounded abutting bearing against the other.

Fig. 1a is a partial detail sectional view similar to Figs. 1 to 4 inclusive, but show ing the utilization of a roller bearing mem ber interposed between the central. pressure bar and the friction shoes.

Fig. 15 is a perspective detail view of the extension member of the compound pressure bar. p

ln the drawings, 2 represents the draw bar ofa coupler connected with the front end portions of side links 3 by a transverse bolt or key i which extends through slots 5 in the front portion thereof, its ends preferably terminating within the inner faces of the center sills 'T of the car framing at each side, for longitudinal movement. Links 3 are longitudinally slotted at their rear ends, as indicated at 8 Fig. 3, and engage lugs 9, of the casing or cylinder 10 mounted between the center sills 7 for limited'movement in bufiing. Casing 10 is closed at its rear end and normally presses against the rear abutment 11, while a follower 12 at the front end is adapted to oppose forward movement of the casing in pulling. Said follower engages against stops 13 of the center sills in forward movement under draft or pulling strains, and is pushed back by the rear end of draw bar 2 in buling.

`Within the casing are friction shoes la which bear by their inner ends against a spring or springs 15, it being noted that a plurality of said shoes are arranged within the casing.

Each of the shoes 11i is provided, preferably at or near its front and rear portion, with a concaved or rounded recess or socket 'bearing 16, entirely within the body portion Said pressure bar, as shown in Figs. 1 and 2, is a single integral member, bearing by its front end against follower 12 and Ais loperative in connection with members 17, to actuate them in the manner of a toggle joint to distend the shoes le into frictional engagement with Ithe casing 10, either in buffing or pulling.

llChe parts being comparatively closely adjusted,ia comparatively small degree of longitudinal movement of member 19 is necessary-to distend the shoes into tight fric-tional engagement with the casing, after which shoes will move within the casing in bu g, or the casing upon the shoes, in pulling, with a Ifrictional resistance proportionate to the strain, any increase of pressure actin g te distend the shoes more tightly against the easing.

Members 17, as shown in Figs. 1 and 2, are generally of oval form incross-section,

their 1longest diameter being on the line c, a,

as indicated in F ig. 1. The angle of such line to the longitudinal center line Z), Z, of the gear is sn'iiciently acute to prevent any locking of the gear at'the maximum pressure and distention and to facilitate a prompt and free'release, due to the action of springs 15 upon release of pressure.

In Figs. 7, S, 10, 13, 141 and 15 the construction is generally the same as just described except that the central pressure bar is made as a compound member consisting of a main Vbar 19L and a supplemental bar 19a. Said supplemental bar is in abutting engagement with the inner end of bar 19 and forms-an extension of it, and by making the central pressure bar as a compound bar member, I provide suiicient flexibility to insure Vagainst any inequality of strain as to the several intervening movable pressure exerting members 17a. That is to say, the flexibility of the compound central pressure bar fallows -said members 17al to adapt themselves Within the friction shoes 14ea to com- -sures .maintenance of the parts in operative position.

'In Fig. 13 lthe supplemental pressure bar vmember 19a 'is shown as provided with ya rounded face 19am-abutting against the confronting "flat Vface 'of lthe .main pressure ybar member 19, providing the Aflexibility above tion slices 14 are somewhat enlarged as to their radius and provide concave rolling bearing faces for intervening rollers 17". These bear by their opposite sides against the concave bearing fares 18" of the central pressure bar 19 and its extension 19h. The action in such case is substantially the saine, except that the rollers 1T" act with the usual effect with roller bearii gs, reducing friction and without any toggle action, mereiy providing for transmission of pressure ro the friction shoes due to the advancing laterally pressing rounded faces of the cent 'al pressure bar or of the friction shoes.

rthe construction and operation of thel gear will be readily understood from the foregoing description and it will he found to provide a simple, highly ei'iiiient and elfective means for exerting great fri/.tional resistance.

Silhat claim is:

1. fr draft gear consisting of a casing, a pair of oppositely located friction shoes within the casing having interior vlore :nid aft bearing recesses, a central compound pressure bar comprising fore and aft abutting sections each ]iirovidial with recesses, and intervening loosely mounted prix nre transmitting members engaging the recesses of the friction shoes and pressure bar respectively.

2. ln combination, a casing, friction shoes within the casing having interior fore and aft l caring recesses,a draw bar and follower in operative relation to the casing, a ventral compound pressure bar composed of fore and aft abutting sections extending inwardly between the friction shoes and each provided with outer recesses, loosely mounted pressure transmitting members between the friction shoes and the pressure bar and engaging the recesses thereof, and a spring` within the casing ei'igaging the friction shoes.

3. ln combination, ay casing, friction shoes within the casingvhaving interior fore and aft bearing recesses, a drawl'iar and follower in oeative relation to thc easing a` eentral compound pressure har rompsd of abutting sect-ions extending inwardly bctvveen the friction shoe: and provided with an intervening flexible joint bearingl and corresponding outer fore and aft bearing recesses, loosely mounted pressure transmitting members between the friction shoes and the pressure bar and engaging the recesses thereof. and a spring within the casing cngaging the friction shoes.

ln testimony whereof l hereunto ailix my signature.

JHN F. COURSON.

Ill()

Images