An Apparatus for Simplifying Statical Mensuration for Girders and the like.
Year: 1899

page_text: Date of Application, 13th June, 1899-Accepted, 5th Aug., 1899
COMPLETE SPECIFICATION.
An Apparatus for Simplifying Statical Mensuration for Girders and
the like.
I, CARL LINZEL, of 107, Kant Strasse, Berlin, in the Empire of Germany.
Architect, 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:-
-
This invention relates to an apparatus for simplifying statical calculations.
The apparatus consists in the arrangement in a holder of stamps with the various
girder profiles, as well as indications of the height, width, and the thickness of
the middle web or bridge piece, and of the flanges. By the use of this universal
girder stamp time is saved in statical calculations and the whole system con-
siderably simplified.
The invention is illustrated in the accompanying drawing:-
Figure 1, being a plan of the box or casing.
Figure an inverted plan, and
Figure 3, a longitudinal section.
In the casing (a), which can be made in any suitable manner, and of any
height, and material, as preferred, and which rests on a base (b), the stamps
are arranged. These stamps are composed of the metal plate () lying beneath
the bottom or bed-plate (c) of the casing (a) and having an india rubber pad (e)
fixed at the bottom. In this the girder profile as also the indications respecting
the height, and the width, and the thickness of the middle web or bridge piece
and of the flanges are stamped out. On the plate (d) is a rod (f) the upper end
of which is secured in the pressing button (g). To each of said pressing
buttons (g) a sleeve or socket (h) is secured which, having its bearing in a
suitable incision or aperture in the covering plate (i) is held by means of its
flanges (k) in the said plate. On the top of the bed or bottom plate (c) is a
sleeve or socket (1) in which the rod (f) is guided. On the upper border or
edge of the sleeve (1) a spiral spring (m) is seated the top of which lies against
the bottom of the pressing button (g). These pressing buttons (g) are furnished
with the profile numbers of the girder profiles as shewn in Figure 1. On the
top plate (i) of the casing adjoining each of the pressing buttons (g) the corre-
sponding moment of resistance is indicated in numbers. An ink-pad may be
fixed to the bottom of the apparatus for the purpose of supplying the india
rubber stamp (e) with ink. A handle (") is suitably arranged in the middle of
the apparatus so as to facilitate its management.
The apparatus is employed in the following manner: After the moment of
resistance has been calculated the particular number is found on the upper plate
and all that is required is to press down the pressing button (g) arranged
adjacent to this number in order to reproduce on the paper inserted beneath the
apparatus the representation of the girder profile together with the height and
width, and the thickness of the bridge piece or middle web, and of the flanges.

page_text: In this manner the architect is spared the trouble of putting in the numbers and
sketching in the profile.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is -
An apparatus for simplifying statical calculations for girders and the like, the
distinguishing feature of which is, that the pressing buttons (g) are arranged
in a casing adjoining the numbers on the upper plate or cover which indicate
the moment of resistance, to which pressing buttons metal plates (d) are
connected, by means of rods (f); an india rubber pad bearing the suitable girder
profile together with the height and width and the thickness of the bridge piece
or web and of the flanges, being attached to the bottom of the plates, whilst a
spiral spring (m) arranged between the pressing button and a lower guide sleeve
or socket () automatically returns the particular stamp to its former position
immediately after. use.
Dated the 13th day of June 1899
W. D. ROWLINGSON,
7, Quality Court; Chancery Lane, London, W.C.,
Agent for the Applicant.