US1793947A - Bumper end construction - Google Patents

Description

Feb. 24, 1931. H, R. MCMAHON BUMPER END CONSTRUCTION Filed July 17, 1930 Patented Feb. 251, 1931 UNITED STATES PATENT OFFICE HARRY R. MCMAHON, 0F CORAOPOLIS, PENNSYLVANIA, ASSIGNOR T0 STANDARD STEEL SPRING COMPANY, A CORPORATION OF PENNSYLVANIA BUMPER END CONSTRUCTION Application led July 17,

This invention relates to bumper constructions and particularly to the end construction of bumpers of the single impact bar type.

Single bar bumpers hitherto used have aso called hinge construction connecting the front and rear members. In one type the front bar is slotted out at the ends and two eyes formed and an eye formed on the rear bar is inserted therebetween, a pin being dropped through the three eyes in known manner. In another type this construction is substantially reversed, a yoke being fastened to the back bar which in turn straddles the front bar, being fastened by a bolt. Both of these constructions, however, materially weaken the bumper at the ends due to the cutting away of the material of the bars and due to the fact that with such constructions every impact causes a shearing tendency on the bolts.

One of the objects of the present invention is to provide a single bar bumper capable of withstanding great shoclr and in which all the members are in mechanical balance.

Another object is to provide a bumper of the single bar type in which the ends are of neat appearance and capable of resisting shock equally with the rest of the bumper.

A further object is to so associate and connect the bar ends that the bolt or pin passing therethrough is never subjected to shearing action, itsonly function being that of maintaining the members in position.

A still further object is to provide an end construction such that failure from shock cannot occur at that point and to provide a construction permitting thc varying of the width and thickness of either bar without detrimental effect.

In the accompanying drawings:

Figure l is a plan view of a bumper end construction embodying the present invention.

Fig. 2 is an elevational view of the same.

Fig. 3 is a section taken on the line III-IH of Fig. 1; and

Fig. 4 is a view similar to Fig. 3 of a modication.

In the accompanying drawings, the impact or front hum er bar 10 is, in this case, the wider and thicer one and the rear bar 1l 1930. Serial No. 468,614.

is the narrower and thinner one. It must be understood, however, that the proportions of these two bars may be varied in any desired manner so that the front or impact bar l0 may be either thinner than the rear bar or it may also be narrower depending upon the conditions that must be fulfilled 1n any particular instance of use. Furthermore, bot-h bars, if so desired, could be of the same width and of the same section.

As will be apparent, the front or impact bar l() is bent around at its end so as to form a substantially cylindrical housing portion or member, which is hereinafter termed an eye or a cylinder.

For the purposes of explanation, it is only necessary to describe one end construction, it being understood that the other end is identical therewith. This cylinder may be formed in any desired or suitable manner, not forming a part of the present invention. The rear bar similarly has a cylinder formed at its end, this second cylinder, however, being in the particular instance shown, a smaller one fitting within the first cylinder and being concentric therewith, the smaller cylinder being, therefore, an inner cylinder relatively speaking. These two cylinders may be assembled in any desired manner such as by inserting the smaller cylinder axially of the larger in which it fits properly, the larger cylinder' being not entirely closed as will be clear from F ig. l, thereby allowin suitable relative movement of the bars under impact or stress.

The complete assembly of the bumper end construction is clear from Fig. 3 and as therel shown lock washers 16 are placed above and below the. inner cylinder followed by suitable spacers 15, a bolt l2 being then passed through all the members, said bolt having an enlarged head 13 and a nut 14 on its lower screvw threaded end. A suitable lock washer 17 with or without other washers is placed between the nut 14 andthe lower ends ot the members concerned. l

Figure 4 illustrates one modified form wherein the larger cylinder is formed of a bar 10 whose cross section is thinner than that of th'e bar 1l forming the inner cylinder as will be understood from the foregoing.

The remaining elements are the same as those of Fig. 3 and further explanation is, therefore not required.

Se n a construction as that set forth provides a bumper of the single bar type which is capable of withstanding great shock and, moreover, so doin without tending to shear the bolts connectingI the single impact bar with the rear bar. n addition, a construction is provided wherein the end construction is as strong as1 any other part of the bumper and hence no weak point exists to shorten the life of the bumper. The proportions and dimensions of the bars may be so chosen that the section modulus is the same in both thereby maintaining the balance of elasticity between the two. This constitutes an important advance and is effected by using in the same bumper a front and rear bar whose relative thickness and width are appropriate, all conditions being considered.

While the. above is illustrative of preferred forms of the invention it is understood that various other modifications, changes, omissions or substitutions may be made without departing from the spirit of the invention.

What I claim as new and desire to secure by Letters Patent is:

1. In a bumperconstruction, a front and a rear bar, the ends of said barshaving nest.- ing concentric eyes, and a bolt assembly passing through said eyes for maintaining said bars in position, said rear bar being narrower than said Jfront bar, and spacers in said bolt assembly compensating for the difference in' width of the bars.

2. In a bumper construction, a front and a rear bar, the ends of said bars having nesting concentric eyes, and a bolt assembly passing through said eyes for maintaining said bars in position, said rear bar being narrower and thinner than said front bar and lock washers and superposed spacers in said bolt assembly cooperating with said rear bar.

Y 3. In a bumper construction, a front and a rear bar, the ends of said bars having nesting concentric eyes, and a bolt assembly passing vthrough said eyes for maintaining said bars in position, said front bar being wider and thinner than said rear bar, and lock washers and superposed spacers in said bolt assembly cooperating with said rear bar.

4. In a bumper construction, a single irnpact bar having eyes at its ends, a rear bar narrower than said impact bar also having eyes at its ends, said eyes being concentrically assembled with the narrower internal of the wider, spacers on said` narrower eyes compensating for the diderenee between the lengths of the eyes, and a bolt passing through the whole.

In testimony whereof, I have hereunto subscribed my name this 14th day of July, 1930.

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