Improvement in Lances.
Year: 1889

page_text: Date of Application, 23rd Jan., 1889
Complete Specification Left, 17th Oct., 1889-Accepted, 23rd Nov., 1889
PROVISIONAL SPECIFICATION.
Improvement in Lances.
I. WILHELM LORENZ of 44 Westendstrasse of Karlsruhe in the Grand Duchy of
Baden, German Empire, Engineer and Manufacturer, do hereby declare the nature
of this invention to be as follows:-
My invention relates to lances having tubular metal shafts, and it consists in
constructing the shafts of such lances with longitudinal grooves or flutings, or with a
cross section of a corrugated configuration, such grooves, flutings or corrugations
being made to extend either along the entire length of the shaft or only partially so,
such as only at the middle part, or only along the whole or part of one half or only
along part of each half.
Such corrugations may be applied either to cylindrical or to tapering shafts, which
may either be made of one piece, or of two or more parts.
The spear head and the butt end may also be formed in one piece with the shaft, or
of separate pieces, secured to the shaft in any desired manner.
The said grooves or flutings may be produced either by drawing, pressing, rolling, or
in any other desired manner.
On the accompanying drawing are shewn various forms of such lances. Fig. 1
shews a cylindrical lance, the shaft of which is grooved or fluted along its entire
length; Figs. 2 and shew cylindrical lances having only the front half of the shaft
wholly or partially fluted; Fig. 4 shews a lance only the middle part of which is
fluted Fig. 5 shews a lance the lower half of which is cylindrical and smooth,
while the upper half is tapered and fluted; Figs. 6, 7, 8 and 9 shew lances
tapered towards both ends, and either wholly or partly grooved. Figs. 11 to 13.
show cross-sections of various configurations of flutings or corrugations, which may be
otherwise variously modified.
In order to impart to the lances increased elasticity the flutings, instead of
running parallel to the axis of the lance, may be formed in a helical direction, as
shewn at Fig. 10 by way of example, on a shaft with cylindrical lower and tapering
upper end.
The flutings may also be made only partly helical, the part towards the middle being
left straight. Lances constructed according to the above described invention have a
much greater degree of resistance against bending and fracture than ordinary lances
with circular cross section, and they can be made of thinner metal while retaining equal
strength, so that they are exceedingly light.
Dated this 23rd day of January 1889.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvement in Lances.
I, WILHELM LORENZ of 44 Westendstrasse of Karlsruhe in the Grand Duchy of
Baden German Empire, Engineer and Manufacturer do hereby declare the nature
of this invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
My invention relates to lances having tubular metal shafts and it consists in
constructing the shafts of such lances with longitudinal grooves or flutings, or with a
cross section of a corrugated configuration, such grooves flutings or corrugations,
being made to extend either along the entire length of the shaft or only partially so,

page_text: such as only at the middle part, or only along the whole or part of one of y
along part of each half.
Such corrugations may be applied either to cylindrical or to tapering shafts, which may
either be made of one piece or of two or more parts.
The spear end and the butt end may also be formed in one piece with the shaft, or
of separate pieces, secured to the shaft in any desired manner.
The said grooves or flutings may be produced either by drawing, pressing, rolling or
in any other desired manner.
On the drawing accompanying my Provisional Specification are shewn various forms
of such lances. Fig. 1 shews a cylindrical lance, the shaft of which is grooved or
fluted, along its entire length; Figs. 2 and 3 shew cylindrical lances having only the
the front half of the shaft wholly or partially fluted; Fig. 4 shews a lance only the
middle part of which is fluted; Fig. 5 shews a lance the lower half of which is
cylindrical and smooth, while the upper half is tapered and fluted; Fig. 6, 7, 8 and 9.
shew lances tapered towards both ends, and either wholly or partly grooved. Figs. 11
to 13 shew cross sections of various configurations of flutings or corrugations which may
be otherwise variously modified.
In order to impart to the lances increased elasticity the flutings, instead of
running parallel to the axis of the lance may be formed in a helical direction, as
shewn at Fig. 10 by way of example, on a shaft with cylindrical lower and tapering
upper end.
The flutings may also be made only partly helical, the part towards the middle being
left straight. Lances constructed according to the above described invention have a
much greater degree of resistance against bending and fracture than ordinary lances
with circular cross section, and they can be made of thinner metal while retaining equal
strength, so that they are exceedingly light.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what I
claim is :-
The herein described construction of tubular lances with grooves, flutings or corru-
gations extending along the whole or part of their length.
Dated this 17th day of October 1889.