US104580A - Improvement in car-trucks - Google Patents

Description

G. H. GRIGGS.

Patented June 21, 1870.

Car Truck.

No. 104,580.V

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Letters Patent No. 104,580, dated June 2l, 1870.

IMPRQVEMENT IN CAR-frauexes.A

The sehedulereferred to in these LettersPatent and making part cf the same. t

To all `fzt'hoia may concern.:

Be v,it known that I, GEORGE H. Games, of Woreester, in the county of Worcester' and State of Massachusetts, have invented certain new and useful Imswinging mot-ion.

I provide a very c flieientand ncarl y constantV friction, which, while it"does not prevent thennovement of the swing-beam, and, consequently, of the car, from side to side to the fullest extent which is allowed by `the construction in other respects, or which is desired in any case, so modifies the Swinging mot-ion that it is almost immediately arrested,` and the 'consequence is a smooth and comparatively steady motion, instead of a succession of free'swings.

I will rst describe what I consider the best means of carrying outmy invention, and will afterward designatethe pointswhichI believe to be new therein.

The accompanying drawing forms a part of this specicatiou.

AFigure 1 is a longitudinal section on the line S S in fig. 2. i

Figure 2 is a plan view.Iv

These figures show the novel parts of an entire truck, with so much of the other parts as seem necessary to show their relation thereto.

Figures 3 and 4 are face views of two forms of some vof the parts; and

Figure 5 is a vertical section through Some of the `parts on -a larger scale.

i Similar letters of reference indicate like parts in all the figures.'

What is known as the swing-beam or swing-motion in car-trucks, originally patented -by Davenport d'. i Bridges in 1844, is too familial' to mechanics to require a detailed description. The drawing represents one of thc most approvedforms.

A is the main framing of the truck, the runninggcar of which is not represented.

Al A2 are the cross-sills, frequently known as logs, and I will so term them. They form a part of the rigid frame-work of the truck, and extend across immediately forward and behind thc cross-timber B, which is the swing-beam, and upon which, the weight `of one end of the car-body is supported and carried in the ordinary manuel'. g

C C are springs 1 1), the sand-plank; and

E Ethe slings or vibrating links which holdup the `sand-plank, and with it, through the aidof the springs C C, theswiig-bcam B, and the load carried thereon,

so that the Swing-beam Il and its connections are allowed to swing ti'om sideto side in the truck.

'lhcre may be springs, not rcpresented to recieve and check the side motion of the swing-beam B, by receiving its impact directly, it' desired.

My invention allows of all ordinary modifications and improvcnicnts in regard to the details, which it is needless to enumerate.

It is common to apply the logs A* A2 close to the swing-beam l, so that it is liable to rubagainst them as it swings from vSide to side; but if the parts are tittcd with absolute parallelism, and thebeam B is made to fill the space with absolute accuracy, so as to induce a reliable li-iction at first, the change of form of the parts ducto springing and warping, the shrinkage of the wood, andthe wear of the rubbing-snriiices would soon materially change the conditions.

Every change ofthe forward motion, and particularly every obstacle encountered ou the track, is liableto induce a strong movement of the car forward or backward, relatively to the truck. To resist this, very cicient bearing-surfaces must be provided, to allow thc swing-beam B to press forward and backward with great force, wit-hout inducing damage to this or any of the other parts.

It has been proposed to introduce springs to control the movement of lthe swing-beam forward and backward I do this, and more. v

The springs previously employed or proposed in such positions and relations, allowed the swing-beam to'move freely from side to side. The springs did not induce resistance to such motion. I have provided springs so arranged that they will yield slightly forward and backward to soften any shocks iu that direction, but this is only one of their functions. Another, which I esteem vastly more important, is' the resistance and rapid extinguislnncnt of the swinging motion of the beam.

I provide rubbing-pieces or broad shoes on my springs, which bear fairly and uniformly against corresponding rubbing-plates on the adjacent surfaces, and thc'friction induced by the tension of my springs is developed between the shoes and rubbing-plates to induce a uniform and reliable resistance, which rapidly kills the swinging motion. I,.In ease an irregularity in the track, or any other cause, has induced a sudden movement of thc truck to one side, or in case, for any reason, the car has been suddenly and violent-ly moved to one side on the truck and'then liberated, the ordinal-)t arrangements allow prolonged series of swings. The swingbeam,.with the load attached, swings back to its normal position, and, with the momentum thus acquired, moves much beyond it, then swings back again nearly to its first extreme position, and a succession of such swings oeA eur before the position of rest is again attained. A car provided with my improvement, on the contrary, moves back to or near its ordinary position, and then rests.

Some of the advantages of. my invention may be realized by elliptic or other forms of springs. I will describe simply what-I consider the best material `and lthe best form. Y

E is a cylindrical spring of vulcanized rubber, made hollow in the center, as usual. Itis partially inelosed within a rim, G1, formed on a plate, G, which is firmly bolted to the swing-beam, and is provided with slight projectionsordowels, g, which fit into shallow holes iu the swing-beam.

This plate G is, by preference, let into the side of the swing-beam, so that its outer surface is flush therewith, but this is not absolutely essential.

A flat plate, I, is correspondingly fitted on or in the ladjacent surface of the truck-log, and a stellt shoeplate, H, of cast-iron or other suitable material, is fitted on the end of the spring E', so as to apply and rub against the rubbing-plate I.

' The shoe is provided with a rim, H, which incloscs a portion of the rubber.

Both the castings G and 1I may, and should, by preference, have a central boss, G and H2, which fits in the centr. l hole in the spring.

lhe bolting of the piece G may be largely effected by a single bolt, g', which applies Vthrough this boss G2, and, by extending through the swing-beam, may secure a corresponding plate, G, and spring, E', on the two faces of the swing-beam B. y

It will be readilyunderstood that, if preferred, the spring may be secured to the truck-log, and made to rub against the rubbing-plate I carried on the swingbeam.

There muy also be more than two of the springs forward of and behind the swing-beam, or one alone placed in line of the center ofthe ear might serve tolerably well in sonie instances. So, also, the spring and its slioe may serve with some success, rubbing against bare wood, without any rubbing-plate I and, with the proper construction of steel spring, the friction might be borne fora considerable time by the spring itself without lthe shoe 1I.

So, also, a portion of the advantages of my invention may be realized by employing my spring on one face of the swing-beam B; as, for example, on the front face, pressing the swing-beam B back to make a friet-ion directly against the rear truck-log A2, or in rear pressing the swing-beam forward to make friction directly against the forward truck-log A, but I prefer the exact number and construction represented.

By making my springs of rubber, mounted and conneeted as shown, I obtain, in addition to the other advantages, a good degree of resistance to the transmission of sound, and the passengers hear less of the noise of the wheels thanwhen there is a contact of hard inelastic substances to conduct the sound.

I claim- 1. In railroad ear-trucks, the within-described arrangement of springs E' Eon one or both sides of the swing-beam B, whereby a constant and strong friction is maintained, to retard, without preventing the swinging motion of the beam, lelatively to the truck, and thereby rapidly arrest the lateral swinging of the ear, as herein specified.

2. The within-described construction of the springs E', holding-plate G 'Glfa-nd shoe H Hl, as and for the purposes herein set forth.

3. The single bolt g', arranged as represented relatively to the central bosses G2, of two holding-plates and two spr-ings on the forward and rear faces of the swing-beam B, as and for the purposes set forth.

In testimony whereof I have hereunto setmy name in presence of two subscribing witnesses.

GEO. H. GRIGGS.

Witnesses l WM. C. DEY,

H. E. PRICE.

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