Improvements in Electric Bell and like Indicators.
Year: 1893

page_text: Date of Application, 7th June, 1893
Complete Specification Left, 6th Mar., 1894-Accepted, 7th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in Electric Bell and like Indicators.
We, JOHN THOMAS GENT, of Narborough Road, and ALWYN WALTER
STAVELEY, and ISAAC HARDY PARSONS, of 86, Hinckley Road, all in Leicester,
in the County of Leicester, Electricians, do hereby declare the nature of this
invention to be as follows:-
Our invention relates to electrical indicators for use in connection with electric
bells and especially to that class of indicators known as pendulum indicators, the
object of the said invention being to simplify the construction of such indicators
and to reduce the cost of manufacture.
In carrying out our invention we provide a two part bracket composed of
stamped or bent metal. The part which carries the electro-magnet has a flat plate
provided with screw-holes by which the indicator may be fixed in position and a
projecting piece at right angles thereto, the said projecting piece being doubled
upon itself and provided with holes through which the holes of the magnet project,
the said magnet being preferably driven into position in the manner described
in the Specification of former Letters Patent No. 10891 of 1885, the other part of
the bracket which is preferably made of thinner metal than the part last described
is gripped by the doubled over part hereinbefore referred to and has its ends bent
so that they will be parallel with each other, the said bent ends carrying the
armature and pendulum.
The armature and pendulum are made of one piece of metal the stem of the
pendulum being bent sufficiently forward to bring the lower part of the said
pendulum near to the glass of the indicator case. In this position the pendulum
overbalances the armature and tends to lift the rear knife-edge of the pendulum;
we therefore provide the armature with two hooks or projections, the foremost pro-
jection having a downwardly projecting knife-edge and the rear projection an
upwardly projecting knife-edge and the holes in the bracket which carry the
armature and pendulum are made with corresponding V-shaped openings.
Dated the 7th day of June 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Electric Bell and like Indicators.
We, JOHN THOMAS GENT, of Narborough Road, and ALWYN WALTER
STAVELEY, of East View, Regent Road, and ISAAC HARDY PARSONS, of
21, Narborough Road, both late of 86, Hinckley Road, all in Leicester, in the
County of Leicester, Electricians, 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:—
Our invention relates to electrical indicators for use in connection with electric
bells and especially to that class of indicators known as pendulum indicators, the
object of the said invention being to simplify the construction of such indicators
and to reduce the cost of manufacture.
In carrying out our invention we provide a two-part bracket composed of

page_text: stamped or bent metal. The part which carries the electro-magnet has a flat plate
provided with screw-holes by which the indicator may be fixed in position and a
projecting piece at right angles thereto, the said projecting piece being doubled
upon itself and provided with holes through which the poles of the magnet project.
This doubled part also carries the pawl of the bracket from which the armature is
suspended.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawing, in which :-
Figure 1 is a front elevation of our improved indicator:
Figure 2 is an end elevation partly in section on the line 2-2, Figure 1; and,
Figure 3 is a plan :
.
Figure 4 is a plan of the blank from which one part of the two-part bracket is
formed; and,
Figures 5 and 6 are respectively a plan and front elevation of the part of the
bracket formed from the said blank:
Figure 7 is the blank for forming the other part of the bracket; and,
Figures 8 and 9 are elevations at right angles to each other of the part of the
bracket formed from the blank shewn in Figure 7.
a, bare the two parts of the two-part bracket, both of which parts are formed
from sheet metal. The blank from which the part a is formed is shewn in Figure 4,
and has a cut on the line c so that the part cl of the blank is ouly connected with
the part on the line c³. To shape the bracket part a the upper portion of the
part c¹ is doubled upon the lower portion on the line and then this folded
portion c is bent on the line at right angles to the part c². The other part 6 of
the bracket is formed from the blank shewn in Figure 7, which blank has its end
portions d, d bent at right angles to the central portion d' on the lines d², d.
This part of the bracket, which is preferably made of thinner metal than the
part a, is placed in the folds formed by doubling over the portion c¹ of the bracket
part a.
e is the electro-magnet the poles of which are inserted through holes f, f
formed in the part c' of the bracket part a and in the part of the bracket
part b, the said magnet being preferably driven into position in the manner
described in the Specification of former Letters Patent No. 10891 of 1885.
g is the armature of the said magnet, and is the pendulum to which the
indicator-flag i is fixed. The said armature and pendulum are preferably made of
one piece of metal, the stem of the pendulum being bent sufficiently forward to
bring the lower part of the said pendulum carrying the flag near to the glass of the
indicator case. As the weight of the pendulum and flag thus arranged would tend
to lift one end of the armature away from its bearing so that the said armature
might become disarranged, we provide the armature with two oppositely formed
hooks or projections j, j¹ having knife-edges on the bottom and top respectively,
and we form the holes k, k¹ in which the said knife-edges rest with corresponding
V-shaped portions so that while the projection with its knife-edge will bear
against the lower part of the hole k, the projection with its knife-edge will bear
against the upper part of the hole k¹.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is :-
The manufacture and use of the improved indicator for electric bells and the like
herein before described and illustrated in the accompanying drawing.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.