US1069526A - Draft-gear. - Google Patents

Description

J. R. GARDWELL.

DRAFT GEAR.

APPLICATION TILED AUG. 21, 1909.

Patented Aug. 5, 1913.

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%Z7IZ64W@%- KfM am JAMES B. CARDWELL. Q1 CHICAGO,

COMPANY, OF CHICAGO, IILINOIS,

ILLINOIS, ASSIGNOR TO UNION DRAFT GEAR A CORPORATION OF ILLINOIS.

DRAFT-GEAR.

Specification f Letters Batent.

Patented Aug. 5,1913.

Application. 11104 August 21, 180i. Serial No. 513,962.

To all'w/mm it may concern.

Be it known that I, Jam-1s R. Camiwnm, a citizen of the United States, and resident of Chicago, county of Cook and State of Illinois, have invented certain new and useful Improvements in DraftGear, of which the following is a specification, and which are illustrated in the accompanying drawings, forming a part thereof.

My invention relates to friction draft gear employed in railway service, and has for one of its objects the provision of means whereby frictional elements are brought into action snccessively, the lighter stresses incident to either bufling or pulling being resisted by springs, supplemented by a mini mum amount of friction-additional frictional elements being available to augment the cushioning action when the stresses are more severe.

A further object of the invention is the provision of means for retaining in place certain laterally movable frictional elements.

One embodiment of my invention is hereinafter described, and is illustrated in the accompanying drawing, which shows a detail plan of the center sills and an end sill of a car, and of the improved draft rigging, some of the parts being broken away and some of the parts being shown in section.

A pair of center sills is shown at a, a, and a portion of an end sill of a car is represented at b.

The coupler is shown at 0, and the usual yoke secured to the butt of the coupler bar and inclosing the shock-resisting elements is designated a. The forward draft lugs are shown at c, c, and the rearward draft lugs at 05, (Z. The forward follower g cooperates with the lugs a, c, and a rearward follower h with the lugs followers is shown as of the box type, being provided with inwardly projecting top and bottom and side flanges which form chambers 9 723, within which the friction elements are housed.

A bolt 0" projects horizontally through the sills a, a, and yoke, elongated slots 3 y, being formed in the sills for its accommodation. Helical springs s, s, are mounted one upon each end of the bolt 0" outside of the sills, and react between outer abutments a, u, adjustably fixed upon the ends of the bolt and abutments t, t, sleeved upon the d, d. Each of these frictional resistance between the bolt, their stems projecting inwardly through the apertures in the sills.

A pair of blocksQfg, is sleeved upon the bolt 1*, the outer faces of these blocks bearing, respectively, against the inner ends of the stems of the abutments t, t, and their inner faces being beveled or inclined outwardly toward each end. A second pair of blocks g 9 is sleeved upon the bolt 1" between the blocks g, g, the inner faces of these blocks being preferably in contact or in close proximity when the gear is in its normal position, these inner faces being preferably flat and perpendicular to the axis of the bolt except adjacent their ends, which are beveled outwardly. The inner portions of the outer faces of the blocks g 9 are preferably recessed to receive the inner faces of the blocks 9, g, and at their ends are beveled inwardly, thereby normally providing V-shaped' recesses with the outer ends of the inclined faces of the blocks g.

The followers 9, h, are provided, respectively, with instanding ribs 9 h on their vertical median lines, these ribs being V- shaped in cross-section and entering between the blocks g g Wedge-blocks g, g, and h, h, each having preferably the form of an equilateral triangle in plan section, are located, respectively, adjacent the inner faces of the followers g, it, one upon each of said instanding ribs thereof 9 b and enter the V-shaped openings between the end portions of the blocks q, f, the sizes of the blocks g, h, and of the recesses be tween the blocks g, 9 being such that lost motion is provided; that is to say, the blocks g, h, when in contact with the inner faces of the followers, with which they have lateral sliding engagement, are out of contact with the blocks q, g when the gear is in its normal position;

Under the influence of either bufiing or pulling stresses there is a relative approach of the followers, which cause the advance of the ribs 9 h between the blocks g g forcing the latter apart against the resistance of the springs s, 8, thus developing ribs 9 h, and the blocks g 9 the bolt '1', and the parts sleeved upon it, being moved laterally.

As the followers continue to approach, the wedge-blocks g, h, come into engagement with the inclined faces of the blocks 9 and and slide thereu on, develo in friction .9 p P g the faces of the blocks 9, g, h, It, with other elements of the gear.

While the blocks 9, h, are loose when the gear is in its normal position, they are, nevertheless, prevented from displacement by the contiguity of the various elements of the gear with which they cooperate when brought into action. All of the parts are restored to their normal positions upon the relief of the stresses of service by the action of the springs s, s. WVhile the ribs 71. are shown as and are preferably integral parts of the followers, this is not essential to the action of the device.

The invention is shown in connection with a draft gear of the type disclosed in my Patent No. 819,266, dated May 1st, 1906,but I do not limit myself to this form of draft gear, the invention in its broader aspects being applicable to other types.

I claim as my invention 1. In a draft gear, in combination, a pair of opposed followers, normally engaged friction elements cooperating with the followers and supplemental elements frictionally, cooperating with the first named friction elements after the initial advance of either follower and being normally out of frictional engagement with the first named friction elements.

2. In a draft gear, in combination, a pair of opposed followers, a pair of spring-advanced laterally movable friction blocks, wedging friction elements associated with the followers and entering between and normally engaged with the blocks, additional "friction elements associated with the followers and engageable but normally out of engagement. with the blocks and means for resisting the outward lateral movement of the additional frictional elements.

3. In a draft gear, in combination, a pair of opposed followers, a pair of laterally movable juxtaposed blocks located between the followers and having their inner and outer faces beveled at their ends, springs urging the blocks together, a wedge projecting inwardly from each follower and engaging the inner faces of the blocks, laterally movable wedge-blocks engageable with the inner face of each follower and located on opposite sides of the first-named wedges and coming into engagement with the outer faces of the juxtaposed blocks as the followers advance toward each other and means for resisting the outward movement of the laterally movable wedge-blocks.

4:. In a draft gear, in combination, a pair of opposed followers, a pair of laterally movable juxtaposed blocks located between the followers and having their inner and outer faces beveled at their ends, a second pair of blocks bearing against the outer faces of the first-named blocks and having the ends of their inner faces beveled, springs urging the blocks together, a wedge projecting inwardly from each follower and engaging the inner faces of the first-named blocks, and laterally movable wedge-blocks engageable with the inner face of each follower and located on opposite sides of the firstnamed wedges and coming into engagement with the outer faces of the juxtaposed blocks and with the inner faces of the second-named blocks asthe followers advance toward each other.

In witness whereof, I hereunto subscribe my name this 20th day of August, A. D. 1909.

JAMES R. CARDWELL.

Witnesses:

G. L. CRAGG, G. E. FOLK.

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