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No. . Patented July 9 1889.
N. PETERS Photo-LIthographar Waahingt D.C.
UNITED STATES PATENT OFFICE.
WILHELM LORENZ OF CARLSRUHE BADEN GERMANY.
SPECIFICATION forming part of Letters Patent No. dated July 9 1889.
Application filed February 6 1889. Serial No 298 801. (No model.)
To all whom it may concern:
Be it known that I WILHELM LORENZ re-siding at Carlsruhe Grand Duchy of Baden in the Empire of Germany have invented a
5 certain new tnd useful Improvement in Tubular Lances of which the following is a specification.
Tubular lances such as heretofore known all have a cylindrical shaft the wall of which
to is of uniform strength. Such tubular lances are too heavy both toward the tip as also to-ward the foot and offer too much surface to the airthat is they meet with too much resistance from the air and do not allow of
15 lateral movements or swinging of the lance with such ease force and rapidity as are required for an effective manipulation of the weapon for attack or defense.
By means of this invention these objec-
20 tions are avoided since the shaft of the tubular lance tapers from the center to the tip or also to the foot the center portion being left cylindrical to offer a convenient grasping-surface for the hand and the taper being
25 formed uniformly or not uniformly by means of rolling drawing or in any other suitable manner. According to the manner of forming the taper the strength of the tut e-wall remains uniform or it can be made weaker
30 toward one end or another or toward both ends; or if desired it can be made stronger toward the ends. Both in the case of uniform strength of the walls of the cones and especially in the case of the strength of the wall
35 decreasing or increasing toward the tip or also toward the foot the capacity of the lance to resist blows or bending is considerably in-creased since the power of resistance in cross-section increases with the increase of diam-
40 eter from one end or the other as also with the strength of the "wall in cross-section. At the same time such conical tubular lances can be provided at the center with a some-what larger diameter than ordinaryfor ex-
45 ample thirty to thirty-five millimeters (about 1.18 to 1.37 inch)for more convenient grasping by a normal hand without thereby in-creasing the weight of the tubular lance and under certain circumstances such weight can
5o be diminished.
The accompanying drawings form a part of this specification.
Figure 1 is a longitudinal section and Fig. 2 is an elevation of a lance constructed in accordance with my invention. 55
Similar letters of reference indicate corresponding parts in both the figures.
A designates the lance-shaft which is tubular as shown and has a central portion B which is cylindrical or of uniform diameter 6o so as to be easily grasped by the hand and which may if so desired be provided with a ring or annular flange C to protect the hand and to facilitate the convenient grasping of the lance. This ring or flange however is 65 not an essential feature of my invention.
From the ends of the central cylindrical portion B the shaft of the lance is tapered; and while I have shown it as tapered toward the tip Mid also toward the foot as at D and 70 E it will be readily understood that it may be of uniform diameter toward the foot with-out departing from the principle of my invention or sacrificing any of the advantages thereof. 75
The tip F and foot G of the lance can be united to the shaft in any desired way or be formed in one piece with the shaft and may be of any desired form.
The shaft can be made of one piece or it 8o may be composed of two or more parts.
The advantages_ of my device will be apparent from the foregoing description and further enlargement thereon is unnecessary.
I claim as my invention 85
1. A tubular lance having its shaft tapering toward one end which terminates in a lance-head substantially as set forth.
2. A tubular lance provided with a shaft tapering from near its center both toward the 90 tip and toward the foot as set forth.
3. A tubular lance provided with a shaft tapering toward each end and having the thickness of its tube-wall varied from the center to the ends as set forth. 95
4. A tubular lance-shaft provided with a cylindrical portion substantially midway its length and tapering from said cylindrical por tion toward each end as set forth.
5. A tubular lance having a shaft provided too
with a central cylindrical portion and tapering from said-portion to the end the said central cylindrical portion having an annular flange to facilitate the grasping of the lance
5 as set forth.
In testimony whereof I have hereunto set my hand at Carlsruhe this 11th day of De-
cember 1SSS in the presence of two subscribing witnesses.
FRIEDRICH LORCH ADOLF LEHNE.