IMPROVE- MENTS IN WEIGHING CRANES
Year: 1881

page_text: LETTERS PATENT to Lorentz Albert Groth, K.G.V., Civil Engineer and
Proprietor of the Scandinavian Patent Office, under the Firm of L. A. Groth
& Co., 97, Finsbury Pavement, London, E.C., for an Invention of "IMPROVE-
MENTS IN WEIGHING CRANES." A communication from abroad by Augustin
of No 26 Rue le Recrattier Paris in the Republic of France.
Vandiana
PROVISIONAL SPECIFICATION left by the said Lorentz Albert Groth at
the Office of the Commissioners of Patents on the 20th July 1881.
<<
LORENTZ ALBERT GROTH, K.G.V., Civil Engineer and Proprietor of the Scan-
dinavian Patent Office, under the Firm of L. A. Groth & Co., 97, Finsbury
Pavement, London, E.C. IMPROVEMENTS IN WEIGHING CRANES." A communi-
cation from abroad by Augustin Verdière, of No. 26, Rue le Regrattier, Paris, in
the Republic of France.
The Invention relates to improvements in cranes in which the loads raised
thereby can be weighed while they are suspended thereto by ineans of steelyard
weighing apparatus adapted to such cranes for that purpose.
The Invention consists in adapting the steelyard weighing apparatus and the jib
of the crane to one another in such a manner that the lower end of the jib rests
upon the shorter arm of a lever, the longer arm of which acts directly or by the
intervention of other levers upon the steelyard arm of the weighing apparatus.
The fulcra of these various levers are composed of knife edges in the usual way.
The weighing apparatus and the lever supporting the jib are carried on the turning
plate or table of the crane, when the crane is a rotating one, or upon the sole plate
or ground when the crane is not adapted to rotate. The upper end of the jib
may be supported by tension rods from a tail frame in the usual way or otherwise.
The essential feature of the Invention consists in the arrangement whereby the
weight of the jib and of the load raised by it is carried by a lever, through the

page_text: medium of which a proportional part of the weight of the jib and load is transmitted
to the steelyard weighing apparatus according to the leverage of the various levers
intervening between the lower end of the jib and the steelyard of the weighing
apparatus, instead of the entire load to be weighed exerting its effect as heretofore
upon the table or platform of the weighing apparatus.
By these means the fatigue of the knife edges is much reduced or wholly
avoided.
Cranes with these arrangements applied may be constructed in various ways,
they may be fixed or portable, may be operated by any suitable arrangements of
gearing, and by hand, steam, or other power according to requirements.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filod
by the said Lorentz Albert Groth in the Great Seal Patent Office on the
20th January 1882.
LORENTZ ALBERT GROTH, Civil Engineer and Proprietor of the Scandinavian
Patent Office, under the Firm of L. A. Groth & Co., 97, Finsbury Pavement,
London, E.C. "IMPROVEMENTS IN WEIGHING-CRANES." A communication from
abroad by Augustin Verdière, of 26, Rue le Regrattier, Paris, in the Republic of
France.
The Invention relates to improvements in cranes in which the loads raised
thereby can be weighed while they are suspended thereto by means of steelyard
weighing apparatus adapted to such cranes for that purpose.
The Invention consists in adapting the steelyard weighing apparatus and the jib
of the crane to one another in such manner that the lower end of the jib rests
upon the shorter arm of a lever, the longer arm of which acts directly or by the
intervention of other levers upon the steelyard arm of the weighing apparatus.
The fulcra of these various levers are composed of knife edges in the usual
way.
The weighing apparatus and the lever supporting the jib are carried on the
turning plate or table of the crane when the crane is a rotating one, or upon the
sole plate or ground when the crane is not adapted to rotate. The upper end of
the jib may be supported by tension rods from a tail frame in the usual way, or
otherwise. The essential feature of the Invention consists in the arrangement
whereby the weight of the jib and of the load raised by it is carried by a lever,
through the medium of which a proportional part of the weight of the jib and the
load is transmitted to the steelyard weighing apparatus according to the leverage
of the various levers intervening between the lower end of the jib and the steelyard
of the weighing apparatus, instead of the entire load to be weighed exerting as
heretofore its effect upon the table or platform of the weighing apparatus. By
these means the fatigue of the knife edges is much reduced or wholly avoided.
In the Drawing hereto annexed, Fig. 1 is a plan of a crane constructed with
the improvements applied thereto; Fig. 2 is an elevation of the same. A, A, are
the lower points of attachment of the tension rods T; B, B, the upper points of
attachment of same; C, crosspiece or axis of the triangular lever; C¹, flat bearing
surfaces forming frictionless abutments for the two sides V, V, of the jib; D, D, knife
edges forming points of support; E, the knife edge of the triangular lever;
F, shackle of the suspension rod; G, knife edge on the short arm of the steelyard
arm; H, knife edge forming the fulcrum of the steelyard arm; J and K, small and
large sliding weights; L, the chain drum; M, the driving pinion; N, hook for
attachment of the weight to be raised; O, regulating screw for tension rod; P, cast
iron tail frame; Q, Q, points of attachment for the links of the tension rod; R, base
plate; S, turning plate; T, tension rod; U, counter weight of the steelyard arm;
V, the jib; X, the pivot of the platform; Y, crank handle; Z, the steelyard arm
graduated according to the conventional weights employed. The steelyard arm X
is furnished with a groove, in which the small weight J is traversed to indicate to
smaller fractions of the weight of the loads.
The operation of the apparatus is as follows:-The object it is desired to weigh
being placed on the hook N in the usual way, it is raised by the crank handle Y,
and when suspended in free space it exerts a pressure upon the jib V.
This pressure is transmitted successively through the various parts of the
apparatus by means of the various knife edges to the steelyard X, which is
equilibrated or balanced by moving the weights J and K further from or nearer to

page_text: the fulcrum according as the load is more or less heavy, the positions of the said
weights on the steelyard arm indicating the weight of the load without the aid of
any additional weights whatever.
Cranes with these arrangements applied may be constructed in various ways;
they may be fixed or portable, may be operated by any suitable arrangements of
gearing, and by hand, steam, or other power.
Having now described the nature of the said Invention, and the manner in
which the same is to be carried into effect, I would have it understood that I do
not confine myself to the precise arrangements herein described and shown in the
Drawings, as they may be modified without departing from the nature of the said
Invention, but what I claim is,-
The construction of weighing cranes in which the pressure exerted by the load
on the jib is transmitted direct to the weighing apparatus, substantially as herein
described and illustrated in the Drawings hereto annexed.
In witness whereof, I, the said Lorentz Albert Groth, have hereunto set
my hand and seal, this Thirty first day of December, in the year of our
Lord One thousand eight hundred and eighty one.
LORENTZ ALBERT GROTH. (L.S.)