An Improvement connected with Tooth Brushes.
Year: 1895

page_text: Cate of Application, 16th Oct., 1895
Complete Specification Left, 14th Jan., 1896-Accepted, 15th Feb., 1896
PROVISIONAL SPECIFICATION.
An Improvement connected with Tooth Brushes.
I EDWARD HENRY HAMILTON of Arsenal Road, Poona, India, Dentist do
hereby declare the nature of this invention to be as follows:-
This invention has for object the manufacture of tooth brushes in duplicate with
the sets of bristles or fibre looking towards each other so that in use both the
inside and outside surfaces of the teeth can be cleaned by the to and fro movement
similar to that adopted for a single brush.
To carry this invention into practice the article with two sets of bristles or
rubbers are arranged in a kind of fork and look towards and almost touch at the
exposed ends. The shoulders of the fork are rounded and merge into a single
handle or one prong of the fork like article may be pivotted and provided with a
spring or one or both prongs may be on springs to yield and exert necessary
pressure when closed.
The jointed or pivoted prong or prongs will facilitate an easy cleaning of the
article when opened out.
Dated this 16th day of October 1805
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said E. H. Hamilton.
1, EDWARD HENRY HAMILTON, of Arsenal Road, Poona, India, Dentist, 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 has for object, the manufacture of tooth brushes in duplicate
with the sets of bristles or fibre looking towards each other so that in use both
the inside and outside surfaces of the teeth can be cleaned by the to and fro
movement similar to that adopted for a single brush.
To carry this invention into practice, the article with two sets of bristles or
rubbers are arranged in a kind of fork and look towards and almost touch at
the exposed ends. The shoulders of the fork are rounded and merge into a single
handle, or one prong of the fork like article may be pivoted and provided with a
spring, or one or both prongs may be on springs to yield and exert necessary
pressure when closed.
The jointed or pivoted prong or prongs will facilitate an easy cleaning of the
article when opened out.
My invention is clearly shown on the annexed drawings.
Figure 1 side elevation.
Figure 2 plan of pronged or double brush with the stock in a piece with the
handle

page_text: Figure 3 plan of a modification of pronged or double brush with one stock in a
piece with the handle, and one pivoted to the neck and held in position with a
yielding action by a spring.
According to Figure 1, the stocks are separately united to a handle by stud
pins passed through them.
Figure 3 represents a double brush with the two stocks set at an angle and in a
piece with the handle.
In all cases the bristles or rubber of the two stocks look towards each other
for the purpose of cleansing the inside and outer surfaces of the teeth by a
simultaneous action when the brush is movel to and fro in the well known manner,
as when using an ordinary single brush, the process being expedited and the
interstices or cavities between the teeth the better cleaned, whereby the teeth can
be kept in a better condition and be preserved to a greater extent than when
cleaned on the outer surface only.
I purpose making the samples represented by Figures 1 to 4 of eb mite, celluloid.
or of similar material, which from its natural flexibility or yielding properties
enable the prongs to open slightly when moving over large or irregular teeth, the
prungs being of curved farm in their length to meet the curvature of the mouth
and of the teeth while being operated.
The sample represents by Figure 51 purpose making of ivory or bone but it
may be of chonite, celluloid, or the like if so desired.
A, A, are prongs. B the handle. (spring. I pivot pin. E, E, stul pins
for fixing the prongs, Figure 4, or the spring. Figure 3, to the handle B. F, Fare
bristles or rubber teeth cleaning material. If bristles be employed they can be
in tufts drawn in and fixed by wires, and it of rubber, they can be moulded to the
required shape, and be cemented, riveted, or sewn on to the inner faces of the
prongs in any desired manner.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what I
claim is :-
The improvement connected with tooth brushes as above recited, riz.: pronged
ends with bristles, fibre, or rubber looking towards each other from either prong
and in a piece with or attached to a handle, as describe and as represented in
the annexed drawigs.
The 13th day of January 1896.
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said E. H. Hamilton.