Improvements in Beam Scales.
Year: 1893

page_text: Date of Application, 11th Mar., 1893
Complete Specification Left, 11th Dec., 1893-Accepted, 3rd Mar., 1894
PROVISIONAL SPECIFICATION..
Improvements in Beam Scales.
I THOMAS CROSSLEY 16 Regent Street Blackburn Weighing Machinist
do hereby declare the nature of this invention to be as follows:-
Usually the side cheeks of a scale beam, are screwed tight to the cross bar,
propose using balls and sockets with pointed adjustible screws going through the
sockets and having their bearings within the balls, thus causing the beam to
vibrate freely upon the points of the screws, without grinding the edges off the
centres.
The reversible centres are round where they fit into the beam ends.
The knife edges of each centre are not less than four in number instead of two as
usually fitted. The centres are each secured with a key or wedge, making them
easily reversible and interchangable.
The bearings are in the form of rings slightly hollowed out at two or more
points, four lugs or brackets project from the outside to retain the steels in
position and act as keys.
Dated this Eleventh day of March 1893.
THOMAS CROSSLEY.
THOMAS CROSSLEY 16 Regent Street Blackburn Weighing Machinist 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 :-
To the upper end of the middle brace I apply a swivel vibrating joint, which is
effected by forming hollow cavities within the upper end of each side cheek, the said
cavities receiving loosely within them the spherical ends of a fixed bar, upon
which bar hangs the whole weight of the machine. A screw passing through the
top of each side cheek into the aforementioned cavity, rests with its point upon and
within a suitable indentation on the surface of the spherical end of the afore-
mentioned fixed bar, allowing the beam and cheeks to vibrate freely.
The beam centres possess not less than four knife edges each, two only of which
are in use at one time, and are fixed into the beam by means of a key or wedge,
by withdrawing of the aforesaid key or wedge the centres may be removed or
reversed at pleasure.
The bearings or steels consist of rings of steel having two or more rectangular
projections upon the outer surface facable with one end and of a convenient
thickness. These projections and the outer surface of the ring, fit into corresponding
recesses in the side cheeks. The inside of the ring is slightly hollowed out at two
or more places, each hollow forming a seat upon which the knife edge of the centre
rest. The aforementioned projections and their correspon ling recesses are 80
arranged as to allow of their being taken out and interchanged when the seat upon
which the knife edge has rested has become worn.
The accompanying drawings are in illustration of my invention.
Fig. 1 is an elevation of beam showing side cheeks, A, of middle brace fixed in
position, the centres and bearings or steels being covered by the cap; B, which is

page_text: fixed by the three screws CCC. One end box is shewn in position at D the centres
and bearings or steels being covered by the cap E. At the opposite end the end
box is removed shewing the centre G. fixed into beam by key H.
Fig. 2 is a section through centre of beam and middle brace, showing the side
checks A A having the hollow cavities I. I. at the upper end, inside which are the
spherical ends JJ. of the fixed bar K. The adjustable screws L L passing
through the top of ŝide checks A A. and bearing against the spherical ends J. J. of
fixed bar K.
B. B show the caps covering centre M in section and the bearings or steels N. N.
Fig. 8. shows the end box in part section and the end of bearing and illustrates
the fastening together of each half by means of the bolt, O, and the plate with
screwed ends P. P.
Fig. 3 is a front and side elevation of bearing or steel showing rectangular
projections, 2222, and hollowed seats for knife edges R R R R.
Fig. 4 shows front elevation and section of that portion of side cheek opposite
beam centre with recesses S. S. S. S. for the reception of the rectangular projections
on outer surface of bearings or steels.
Fig. 5 is an end and side elevation of beam centre, U being the portion fixed into
beam, and V VVV and VV'V' being the knife edges.
Fig. 6 is an inside view and section of cap B, shown in position on Sheet 1,
Figs. 1 and 2. The three projections shown at T TT and T T correspond when
fixed in position with three projections on bearing or steel N. N.
Fig. 7 shows the vibrating joint part in section, the part not in section illustrates
the outer formation of the upper end of side cheeks A. A, whilst the indentation
upon the surface of spherical end J of fixed bar K is shewn at W, with point of
adjustable screw L, resting upon and within the said indentation W.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I claim
is in a beam scale
1. Ball and socket vibrating middle brace.
2. Reversible beam scale centres.
3. Reversible beam scale bearings.
Dated thie 8th day of December 1803