Improvements in Centering.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Centering.
I FRIEDRICH TRÄBERT of Rathenow in the Empire of Germany Builder and
Carpenter 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 or by the
following statement :-
The improvements relate to adjustable centering and are represented in the annexed
drawings in Figs 1 to 4. The centering is adjustable and the pitch regulated
automatically. The figures 1 and 2 show centers completely drawn together in side
view and plan-view, Fig. 3 represents the same center partly drawn out in side-view,
and Fig. 4 is a view of the partly drawn out center with vault removed.
The centering consists of the vault rails e cand of the tie-rails 662, which are
journalled at their ends into a pair of cheeks d d and d¹ d¹. The tie-rails b b³ are
securely riveted to the cheeks d d', and the guides 6 and 63 on the inner ends of
these rails are so arranged, that the guide grasps the rail 63 and the guide 63 does
likewise with the rail b, (Figs. 1, 3 and 4). The rail 62 has holes at certain intervals
and the rail is likewise provided at a² with a hole for inserting a pin² attached
to through a² and into a corresponding hole at according to the span
required.
between the cheek-pairs d
Instead of the pins
1.
The outer ends of the vault rails c and c² rest on and
and and are secured at a by pin and at a' by pin
screws may be used for securing the vault-rails between the cheeks, in which case
the holes should be provided with corresponding worms. The guides existing at the
inner ends of the vault rails are so arranged that the guide c¹ of the rail c grasps the
vault-rails 2 and the guide c³ of the vault holds the vault-rail c (figs. 1 to 3). The
spikes sand s arranged at the vault rails c and c² are for the correct erection of the
centering-pieces and serve for holding them together.
The cheek-pairs d and d' are provided at the upper ends with projecting flaps e
and e¹, which rest upon the abutments of the girders.
The use of the described centering is as follows:
After the pin has been withdrawn from the rails 6 and 62, the centers are
adjusted for the correct span of arch by shifting the rails b and 62 respectively c and c²
and are then fixed by the pin 72, which is inserted through the hole a² of the rail b
and through the corresponding hole of the rail 62, when the pitch regulates itself
automatically in the proportion of 12 to 1 as the vault rails c and care movable on
the pins (fig. 1) and screws (fig. 3) and when for instance an arch is to be executed
between iron supports, the vault-centers with their flaps e e and e¹ e¹ are suspended at the
flanges of tho iron girders and are adjusted by the plummet and the connection of
the centers between themselves is effected by two laths L, which are driven into the
spikes s¹ and s fixed on the rails c and c². The laths, which are further necessary
are equally distributed over the arches.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
The adjustable bearers c c² with their spikes s¹, s and the tie-rails b, b' with their
jaws 636 together with the cheeks d d and d¹ d' all substantially as described and
illustrated and for the purposes set forth.
HERBERT & Co.,
18, Buckingham Street, Strand, W.C., London, Agents to Applicant.
HERBERT & Co.,
18, Buckingham Street, Strand, W.C., London, Agents to Applicant.