IMPROVEMENTS IN OR CONNECTED WITH BLACKBOARDS USED CHIEFLY FOR OR APPLICABLE TO EDUCATIONAL PURPOSES
Year: 1884

page_text: We JAMES HODKINSON DAVID CLARKE and GEORGE HODKINSON of the firm
and trading as Hodkinson & Clarke Manufacturers Canada Works Small Heath
Birmingham in the County of Warwick do hereby declare the nature of our
Invention for IMPROVEMENTS IN OR CONNECTED WITH BLACKBOARDS USED CHIEFLY
FOR OR APPLICABLE TO EDUCATIONAL PURPOSES, to be as follows:-
Our Invention has reference to what is commonly known in commerce as
blackboards and consists of a board slate or other material being fixed in a frame
and suspended by pins or pivots at the sides the purpose being to illustrate and
facilitate in the mode of education.
We will describe our Invention thus:-To the pins or pivots (or in connection
therewith) and upon which the said blackboard depends, we arrange a toothed
or cogged wheel or its equivalent into which is geared a pawl or catch, the
object being to retain in a desired position and at any angle the said blackboard
and sufficiently rigid that it will not yield when in application the said toothed
wheel and pawl may be constructed on either or both sides.
One mode of supporting the frame with blackboard is by feet projecting from
the sides, but when the frame and blackboard is supported by or from a pillar.
or pedestal also working upon a pin or pivot vertically an additional toothed
wheel or cog, and pawl or catch is then employed to control it in a rotatory
movement in addition to and for the purpose above described.
Dated 19th Ancil 1001
THO. KENDRICK,
Agent for Applicants.

page_text: We JAMES HODKINSON DAVID CLARKE and GEORGE HODKINSON of the firm
and trading as "Hodkinson & Clarke" Manufacturers of Canada Works Small
Heath Birmingham in the County of Warwick do hereby declare the nature of
our Invention for IMPROVEMENTS IN OR CONNECTED WITH BLACKBOARDS USED
CHIEFLY FOR OR APPLICABLE TO EDUCATIONAL PURPOSES, and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
Our Invention has reference to what is commonly known in commerce as
blackboards and consists of a board slate or other material being fixed in a fram
and suspended by pins or pivots at the sides the purpose being to illustrate and
facilitate in the mode of education.
We will describe our Invention thus:-To the pins or pivots (or in connection
therewith and upon which the said blackboard depends we arrange a toothed
or cogged wheel or its equivalent into which is geared a pawl or catch the
object being to retain in a desired position and at any angle the said blackboard
and sufficiently rigid that it will not yield when in application the said toothed
wheel and pawl may be constructed on either or both sides.
One mode of supporting the frame with blackboard is by feet projecting from
the sides but when the frame and blackboard-is-supported-by-or-from-a-pillar
or pedestal also working upon the pin or pivot vertically an additional toothed
wheel or cog and pawl or catch is then employed to control it in a rotary movement
in addition to and for the purpose above described.
And in order that this our said Invention may be more clearly understood and
readily carried into effect we will proceed aided by the accompanying Drawings
more fully to describe the same.
Fig. 1 is a perspective view of a blackboard arranged in its frame complete.
Fig. 2 a side elevation of pivot at "A"-Fig. 1 shewing toothed or cogged
wheel with pawl or catch.
"
Fig. 3 a sectional plan of pivot at " A as shewn in Fig. 2.
Fig. 4 a front view of pivot at "a" as Fig. 1.
Fig. 5, a sectional view of pivot at B as perspective view Fig. 1.
Fig. 6 a side view and a front view of a disc with holes in the edge to be used
instead of a toothed wheel.
Fig. 7 a side view and a front view of a disc with holes through it to be used
instead of a toothed wheel.
Fig. 8 is a detail of the catch or pawl to be used in connection with the toothed
wheel or modifications either hinged or sliding in combination with the discs at
Figs. 6 or 7.
Similar
letters indicate similar parts in the different Figures.
"A" is the pivot arrangement complete as applied to the side of blackboard.
"B" is a modification of same as applied to the bottom of the frame carrying
blackboard.
"
"0" a toothed wheel
n
C¹" plates cast on toothed wheel to attach it to blackboard.
"0"
"
screws in plates "C¹."
DD" semicular circular plates fastened to frame.
"D¹ D'" projections on plates "D" to fasten to frame.
"E" catch or pawl.
E" hinge pin for catch.

page_text: "HH" holes in side of disc.
"H" plates on disc to attach to blackboard.
"J" circular plate to attach vertical pivot to blackboard frame as at "B" Fig. 1.
"J" plates to attach circular plate "J" to frame of blackboard.
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'K" groove in vertical pivot whereby it is kept in position.
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 construction or arrangement of parts consisting of the toothed or cogged
wheel "C" or its equivalent "G" or H in combination with the pawl or catch "E"
hinged at E or sliding as an equivalent for the purposes hereinbefore described
and illustrated or any mere inodification thereof.