Untitled record

Application filed March 2,1889. Serial No. 301,751. (No model.)

To all whom it may coiocern:

Be it known that I, Wilhelm Lorenz, of Carlsruhe, Baden, in the Empire of Germany, . have invented a certain new and useful Im5 provement in Lances, of which the following is a specification.

The highly-effective weapons known as “lances’’havebeen before made with tubular metal shafts, the shafts being variously condiio tioned with regard to their attachment to the heads and with regard to taper, being sometimes in one piece and sometimes in two or more pieces. I can correspondingly vary the conditions. My improved lance has a hollow 15 metal shaft, and may be made, like corresponding shafts before known, of uniform size throughout, or tapered one way or tapered both ways in one piece or in many pieces. I have discovered that the shafts 20 may be greatly stiffened and lightened by producing them with longitudinal corrugations extending along the whole or a part of their lengths. These corrugations, by which I mean ridges and grooves extending length25 wise along the shaft, may be produced by drawing, pressing, rolling, or in any other • convenient way. They may be produced by casting the ingot or metal mass with such corrugations and afterward using the metal 30 in the same form as it is cast, or variously modified by rolling, drawing, stamping, pressing, &c.; or the metal may be cast or otherwise shaped as a plain cylindrical tube and be subsequently treated to produce the cor35 rugations.

The accompanjing drawings form a part of this specification, and represent what I consider the best forms for carrying out the invention.

Figure 1 is a lance hairing a shaft of uniform size throughout, except that it is con tracted near each end. Figs. 2 to 10, inclusive, are modifications. All these are side elevations. Figs. 11,12, and 13 are cross-sections on a larger scale. Fig. 13 corresponds to 45 Fig. 1. The other figures are modifications having a less number of corrugations.

Similar letters of reference indicate corresponding parts in all the figures where they occur. , 5°

A is the head of the lance, and B is the hollow shaft thereof. Certain portions of the latter are designated in the sectional views by supernumerals, as B' B². The corrugations are thus marked B', indicating the 55 ridges on the exterior, and B² indicating the grooves in the exterior. It will be observed that the form of the interior corresponds with that of the exterior. The metal is of nearly equal thickness throughout. _ 60

In what I esteem a very useful modification (shown in Fig. 10) the corrugations are arranged helicoidally. Such corrugations may give very desirable elasticity. The corrugations may grow less toward the center or to- 65 ward the ends. They may extend only along a portion, as in Fig. 2 and several others. There may be other variations than those shown.