US1170253A - Bolster-spring. - Google Patents

Description

E. J. HARVEY.

BOLSTER SPRING. APPLICATION FILED JUNE-I13, 1 914.

Patented Feb. 1, 1916.

HE COLUMBIA PLA ccmAPl-l c0 SH NnTo D c EDWARD JrHAR1VEY, OF RACINE, WISCONSIN.

BOLSTER-SPRING.

SpecificationbfiLetters Patent. Patented Feb. 1, 1916.

Application filed. June 13, 1914. Serial No. 844,857.

To all whom it may concern:

Be it known that I, EDWARD J. HARVEY, a citizen of the United States, residing at the city of Racine, county of Racine, and State of Visconsin, have invented new and useful Improvements in Bolster-Springs, of which the following is a specification.

My invention relates to improvements in bolster springs for wagons.

The object of my invention, is among other things, to porting bars, with which the springs are connected, that the point of contact of the springs with such bars will be increased as the weight of the load increases, whereby the strain will be extended from the center toward the respective ends of said bars, as the latter are depressed by the load, and whereby the resistance of the spring to the load will be increased as the point of contact of the spring with the bars is increased, and also whereby I am enabled in some cases to use a single plate only in the construction of the respective spring, and whereby a less number of plates are necessary than would otherwise be required for supporting a given load. It is a well known fact, that springs as ordinarily constructed to support a heavy load, would be too rigid to use with comfort with a light load. In other words, heavy springs are too rigid to use with comfort when subjected to a light load, while by my improvements a light spring which may be used with comfort with a light load becomes more rigid in proportion to the weight upon it, and consequently a given bolster spring thus made is adapted to be used with both-light and heavy loads.

My invention is further explained by reference to the accompanying drawings, in which- Figure 1 represents a side view showing the spring as it appears before it is subjected to the weight of a load. Fig. 2 represents the same device showing the spring as it appears under pressure of a load. Fig. 3 is a vertical section drawn on line 00, w of Fig. 1, and Fig. 4 is a vertical section drawn on line y, y of Fig. 1.

so construct the box sup- Like parts are identified by the samereference numerals throughout the several views. I a

1 is a wagon bolster of ordinary construction.

2 represents the bolster spring, the respective ends of which are pivotally connected with the bolster 1 through the U-shaped stirrups 3. The respective ends of the springs are provided with circular bends 4, which inclose the ends of the stirrups 8, while the center portion of the stirrups rests upon the bolster 1 and are retained in place by the plates 5 and circular brackets 6. To the center of each spring is rigidly secured a bar 7, by the U-shaped keepers 8 and nuts 9, which nuts have threaded bearings on the respective ends of the keepers 8. The lower side of the bars 7 are straight and are adapted asthe springs are compressed, from the position shown in Fig. 1 to that shown in Fig.2, to be brought in direct contact with the upper side of the springs, as shown in said Fig. 2, whereby the area of the point of contact upon which the load rests is increased in proportion to such load and whereby the rigidity of the spring is also increased in proportion to its load. The respective ends of the bars 7 are preferably connected together by metal plates 10 and bolts 11.. 1

It will be understood that the ordinary wagon box, not shown, is adapted to rest at its respective ends upon the bars 7, and that such box is free to move upward and downward with the load between the stakes 12, 12 as the springs are compressed and expanded by the jarring movement of the vehicle with which they are connected.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is-

The combination with a bar having a flat surface, of a leaf spring secured to said flat surface of the bar, said spring projecting outwardly from the point of connection longitudinally of the bar and diverging therefrom in a continuous curve from the portion in contact with the bar substantially to the outer end of the spring, the

form and resilience of said spring being load to be carried, substantially as rle- 10 such that the area of continuous contact scribed.

with the bar Will progressively increase in In testimony whereof I affiX my signature direct proportion to thefload aihd tllIOLghin the presence of tWo Witnesses.

out the entire length 0 said at sur ace 7' opposed to the spring, whereby the spring EDWARD HARVEX' may be progressively reinforced by the bar Vvitnesses:

from the point of connection to theend of H. N. BAooN,

the area of contact in accordance with the THos. ALLEN.

Copies of this patent may be obtained for five centsteach, by addressing the Commissioner of Patents. Washington, I). G.

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