US1586782A - Bolster plate - Google Patents

Description

June 1 1926.

F. w. (CHRISWELL BOLSTER PLATE Filed August 6, 1925 BY MM ATTORNEY Patented dune l, 192%,

FREDERICK W. CHRISWELL, OF SEATTLE, WASHINGTON.

BOLS'IEB PLATE.

Application filed. August 6, 1925.

This invention relates to improvements in bolster plates for use on logging cars and the object of this invention is to provide a one piece bolster plate that is strong and durable in construction and that will not be broken by ordinary use.

Another object is to provide a castmetal bolster plate shaped to fulfill certainreqmrements but designedso as to avoid producing internal stresses and crystal deformation in the metal as the casting cools.

These bolster plates are commonly used on logging cars for supporting car bunks thereon, the bolster plates resting on the is usual cross bolster of the car.

Bolster plates of this nature as heretofore constructed have not been satisfactory, due to the fact that they are liable to break near the location of the central hub under ordias nary conditionof use. This weakness is not due to lack of the necessary weight or amount of material at the location where the breaks occur but ratherto the fact that the casting is shaped so that the crystals in the material at that particular location are deformed, compressed and left under permanent stress as the casting cools, thus leaving them in a state in which they break easily.

The present invention overcomes this difficulty by providing a bolster plate that eliminates this deforn'iation in the material. l1 accomplish the objects by devices illustrated in the accompanying drawings wherein,

l igure 1 is a riew in side elevation of a bolster plate constructed in accordance with this invention.

Fig. 2 is a view in longitudinal midsec tion of the same. I

Figs. 3 and l are bottom and top plan views respectively of the same.

Figs. 5, 6. and 7 are views in cross section on broken lines 55, 66, and 77 respectively of Fig. 3.

Referring to the drawings, throughout which like reference numerals designate like parts, Figs. 1 to 7 inclusive indicate a preferred form of bolster plate of one piece integral construction and of substantially rectangular form that is adapted to be used upon the bolster of a logging car to support a relatively heavy log bunk on which logs are carried. The weight of the lo" bunk 513 wholly upon the ends of the plate shown All 1 thereby fgi fii flilfllllg "smaller hub 18.

Serial No. 48,453.

a strain where the web members meet the outer hub member as indicated by the arrows in Fig. 1. ihe bolster plate has a flat top side 12, as shown in Fig. l, and a bottom. side shown in Fig. 5, that is provided with cored portions 13 leaving at each side longitudinal webs 1d and midway between the two sides other longitudinal webs 15 that are thickened, as at 16, near the center of the bolster plate.

A larger hub 1'? extends downwardly from the center of the bolster plate and a smaller hub 18 extends upwardly from the bottom 19 of the larger hub 17. The upper end of the smaller hub 18 has a hole 20 of smaller diameter than the interior of said The webs l l and 16 all terminate in and are integral with the larger hub 17. The top side of the bolster plate is cored, as at 21 and 22, to leave relatively long recesses in the longitudinal medial plane of the plate and the inner ends of said cored recesses 21 and 22 are cored deeper, as at 28 and 24, said deeper portions extending down between the walls of the larger hub portion 17 and the small hub portion 18.

It will be noted that the thickened webs 16 on the bottom with the recesses 21, 22, 28, and 2% on the top leaves in effect two ribs of metal that extend continuously across the bolster plate on opposite sides of the hub 18.

Arcuate recesses 25 and 26 are formed in the top side of the bolster plate to the front and rear of the center and extend down between hubs 17 and 18, said recesses 25 and 26 are both undercut at both ends as indicated at 27 to reduce the weight of the bolster plate as much as possible andyet leave relatively wide and substantial webs 28 of metal connecting the central hub 18 with the remainder of the bolster plate body at four points between the cored recesses 25, 24, 26, and 23, two of the webs 28 being on each side of the smaller hub 18.

It will be noted that the webs 28 on the top side and the widened portions 16 of webs 15 on the bottom-side are all integrally connected with hub 17 thus greatly strengthen ing the structure and tending to prevent the bolster plate from breaking within or around the hub portion. Flanges 30 are provided both on the front and rear side of the holster plate to a Wider bearing surface Square corners and deep recesses are avoided as much as possible in the construction around the hub so that when the bolster plate is cooling in the process of casting it will not be subjected to excessive strains sutiicient to deform the crystals of the metal due to compression of the molding sand in pockets.

The invention shown provides the relatively wide webs 28, two on each side of the smaller hub both extending continuously across the bolster plate so as to prevent normal contraction of metal as the bolster plate cools in casting. These webs are also located as to afford the greatest resistance to transverse breakage. ltbnormal stresses are also reduced by providing relatively shallow pockets with rounded corners so that the wedging of the molding sand and consequent deformation oi the crystals of the metal in cooling will be reduced to a minimum. This is especially apparent in the provision of recesses 21 Q3 and 222l, the recesses 21 and 22 extending well outwardly and tapering to points as shown and the corners being rounded instead of square where recesses 21 and 22 intersect recesses 23 am 2% respectively.

The foregoing description and accompanying drawings clearly disclose a preferred embodiment of this invention but it will be understood that this disclosure is merely illustrative and that such changes in the device may be made as are within the scope and spirit of the following claims.

hat I claim is 1. A bolster plate of the class described, embodying a body portion, two integral concentric hubs in said bolster plate arranged in relatively spaced relation one within the other and a plurality of integral web members on each side of the longitudinal center line of said bolster plate extending across the space between said two hub members.

2. A bolster plate of the class described, embodying a relatively long rectangular body member, a large integral hub extending downwardly from the center of said body member, a small integral hub extending upwardly within and spaced tron said larger hub, and two loi'lgitudinal webs extending across the space between s: itl hubs on each side of the longitudinal center line of said bolster plate and uniting with portions of said smaller hub to form a ous metal bridge across the central portion of said bolster plate.

3. A bolster plate of the class des ribed, embodying a relatively long body member, two integral concentric hubs ot ditl'erent size disposed centrally of said bolster plate and arranged concentrically one within the other in spaced relation, web members on the bottom side of said bolster plate mid way between the two sides and having relatively wide portions that merge with said outer hub, said bolster plate having longitudinal recesses on its front side opposite said wider rib portions and having longitudinal ribs on opposite sides of said recesses extending across the space between said two hubs and merging with said inner hub.

4:. A bolster plate of the clas described embodying a relatively long body member, a larger integral hub extending downwardly from the center of said body member. a smaller integral hub extending upwardly concentrically within said larger hub and leaving an annular space between the walls of said two hubs, webs on the bottom of said bolster plates at the sides thereof and merging with said larger hub, other webs on the bottom of said bolster plate mid way between the two sides thereof and having relatively wide portions that merge with said outer hub, said bolster plate having longitudinal recesses on its top side that extend down into said wider web portions and are deeper atthe location of said annular space between said two hubs and longitudinal ribs on opposite sides of said recesses extending across the space between said two hubs and being substantially tangent to said inner hub.

In witness whereof, I hereunto subscribe my name this th day of July, A. D. 192.3.

FREDERICK W. Clllll r ll lilili.

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