US1115747A - Draft-gear. - Google Patents

Description

T. H. SYMINGTON.

DRAFT GEAR.

APPLIGATIQN FILED APRA 4, 1912.

Patented. N 0V. 3, 1914.

' THOMAS- H. SYMINGTON, OF BALTIMORE, MARYLAND.

DRAFT-GEAR;

Specification of Letters Patent.

, Patented Nov. 3, 1914.

Appiieatmn inea April 4,1912.` serial No. 638,456.

T all whomz't may] concern.' i

\ Be it known that I, THOMAS H. SYMI'NG- TON, a citizen of the United States of America, residing at the city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Draft- Gear, of which thefollowingis a specification.

The draft gear of my invention comprises `a draw-bar, a yoke secured thereto and mounted between the sills, a front stop,`a rear follower extending substantially from sill to sill and notched to' receive the arms of the yoke, shock-absorbing means between the front stop and the rear follower, a rear stop in the form of an abutment on each sill, the follower engaging the abutments at points immediately adjacent the sills duringl bufing. p

In the preferred form of my invention the draft beams-are provided with two sets o-f alined, elongated slots. The horizontal yoke is correspondingly slotted, and the drawbar is slotted in alinement withvthe slots of the front set in the beams vand yoke. A.

key is seated in each of slots, the rear key serving as a forward stop. Any preferred forni of mounted within the yokeand serves to transmit to the sills, by@ way of the front stop, the drawing stress applied by the draft gear. There is an abutment secured to each ysill acting as a rear stop,'and a rear follower, in the form of an H-shaped member, is.mounted within the yoke, thearms of the yoke passing throughthe notches or slots -of the-H and engaging the cross bar of the H. This follower serves to transmit builing stress applied` to the gear, from the shockabsorbing member to the sills byv way .of the rear abutment, the extremities of the arms of the H bearing on the shoulders adjacent the sills, so that there is ,practically no bendlng moment applied to the sills, the stress being entirely one of compression and shearing.

In the accompanying drawing I have illustrated a draft gear embodying the principle of my invention in its preferred form.

Figure 1 is a lan divided on the longitudinal center line of the gear, one half being a top View, the -other being a section on the line 1, 1 of Figx. Fig. 2 is a central longitudinal section, certain of the parts being shown in elevation. Fig. 3 is a transversever-tical section on theline 3, 3 of Fig.

' direct to the yoke.

shock-'absorbing means is H forming top member of the H, indicated by 1. Fig..4 is an elevation of the H-shaped follower. Fig. 5 shows a modified form of follower. l n. Between the longitudinal sills or draft ,arms 1 is a horizontal yoke 2. The sills and yokeas shown, are pierced with two sets of alined, e1ongated slots, indicated by reference characters as follows: the slots of the front setlin the sills 4, the rear slots 5, the front slots in the yoke 6, and the rear slots' in the yoke 7. Thereis a front key 8 placed in the slots of the front set, and a rear .key

9 placed in the slots -of thev rear set. The

.draw-.bar 10 is slotted at 11 to fit the front key which passes therethrough, and the` front key serves to transmit tension stress The slots 6 extend to ,the rear so that compression stress 'is never, applied to the yoke, and the key is also adapted to bear at times against the front face-of the slot in the sill to transmit eX- treme tension direct from the draw-bar to the-sill when maximum drawing stress is applied, or to vtake a continued bearing` thereagainst during drawing -to prevent pulling out of the draw-bar when failure of the gear occurs.: Within the arms of the yoke, as seen in plan view, is any suitable shock-absorbing member as the springs 12. For the purpose of receiving the compressive force of the springs vin drawing and transmitting the vsame'tothe rear key 9, which actsvas a front stop, and also for the purpose of applying compressive force tothe'sprin'gs'in bufiing, I have provided a front follower 13 mounted" on the rear key and slotted to receive the same. This follower may be of-any suitable or usual type, and transmitting pressure'at the forward end of the springs may be substituted lIor' it. Within the arms of the yoke I have also shown a rear follower 14. This follower eX- tends substantially from sill' to sill and takes its bearing during buiing on shoulders 15 secured to the sills, forming rear abutments. The rear follower 14 is preferably an H- shaped member,

and bottomarms of the follower, the extremities of which bear, during bufing, on the shoulders 15 at points adjacent' thesills. The rear army 17 of the yoke bears on the central portion or connecting 17, during drawing, and the notches 18 between the and any means for applying see FigjS, the legs 16 of the 'legs of the H receive the arms of the yoke, and

permit them to be suitably spac'ed from the sills and thereby avoid the cheek plates and the key bearings, etc. adjacent the slots 4 and 5.

The operation of the gear will be clearly apparent from the description taken in connection with the accompanying drawing. The gear is shown in the lposition which it will take when subjected to no stress. In drawing, the stress -is transmitted. from the draw-bar to the front key 8, hence to the yoke, by which it is appliedA to the rear follower. The rear follower compresses the springs or friction gear and transmits stress to the front follower which is mounted on the rear key 9, the latter serving a's a forward abutment. It will be noted that in normal position this key rests against the front ends of the slots 5 in the draft beams. As drawing is continued and the gear. is compressed, the 'front key moves forward toward the front ends' of the slots 4 in the draft beam, and under extreme stress,` bothv keys bear against the front ends of their slots and the stress is applied direct to Vthe. sills. If any portion of the gear fails, the

front key forms a rigid connection' between the draw-bar and sills. This prevents pulling out of the draw-bar. In buiiing, stress is applied first by the'draw-bar to the front follower`v13 which transmits it through the shock-absorbing gear to the rear follower 14, by which it is transmitted from the eX- tremities of the arms 16 of the H-shaped follower to the shoulders at points closely adjacent the sills. By ,applying the stress at points closely adjacent to the central webs of the sills, the bending moment is substantially eliminated and consequent spreading of the sills is avoided. Under extreme buffing stress the keys take a bearing against the rear ends of their slots and thus prevent destruction of the springs. l In Fig. 5 I have illustrated another form of followerfhaving slots 2O instead of notches 17 to receive the arms of the yoke.

Its operation will be easily understood in connection with the description. The edges 21 of this follower engage the rear stop immediately adjacent the sills in buiing as do the ends of the arms of the H-shaped follower.

I have thus described my invention in its preferred form in order that its nature' and. operation may be clearly understood. However, the specific terms' herein are used in their descriptive rather than in their limitv inv sense.

IlVhat 'I claim and desire to secure by Letters Patent is: n

In a draft gear havin two keys only, a slotted draw-bar, a draft eam-having front and rear sets of alined slots, a horizontal yoke having corresponding slots, one key passing through the slot in the draw-bar and seated in the forward set of slots in the yoke and draft beams, the second or rear key passing through the rear slots in the yoke and draft beams and serving as a forward stop, a rear stop consisting of separate, independent\ abutments, one secured to each sill and a rear `follower in the form of an H-shaped member, the connecting arm of the H being encircled by the yoke and the ends of the legs of the H bearing against the rear stop at points immediately adjacent the sills.

Signed by me at Baltimore, Maryland, this 2d day of April, 1912.

THoMAs H. s YMINGToN.

Witnesses:

A. H. WESTON, I. O. WRIGHT.

Images