Blackboard Chalk Holder.
Year: 1892

page_text: Date of Application, 25th Mar., 1892
Complete Specification Left, 19th Dec., 1892-Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION.
Blackboard Chalk Holder.
I, JOSEPH GREAVES of 137, Balfour Street, Oldham in the County of
Lancashire, Schoolmaster, do hereby declare the nature of this invention to be as
follows:-
This invention is chiefly intended to serve as an attachment, when convenient,
to blackboards in schools, so as to hold chalk when the chalk is not being used for
the moment by the teacher. In this invention a spring clip is made so that it will
clip a blackboard. Then a box to hold chalk is fastened by rivet, or otherwise
attached to the clip. I prefer that the box should work so as to revolve round on
the rivet, that the holder may be fixed to the top, bottom or either end of the
blackboard, and the holder be right side up for holding chalk. The box can be
made so as to have a lip on one side, and the spring clip to have cross slots. Then
when the clip grips the blackboard the lip of the box can be inserted in one of the
cross slots or slits. This also allows the holder to be fixed in the right position on
top, bottom or either end of the blackboard.
Figures A. B. C. & D. show forms of chalk holder for blackboard.
Dhoul
SML 1002
JOSEPH GREAVES.
COMPLETE SPECIFICATION.
Blackboard Chalk Holder.
1, JOSEPH GREAVES of 137, Balfour Street, Oldham Lancashire Schoolmaster
do hereby declare the nature of this invention and in what manner the same is to
he performed, to be particularly described and ascertained in and by the following
statement :-
This invention is intended chiefly to serve as an attachment when convenient, to
blackboards, so as to hold chalk, when the chalk is not being used by the teacher
for the moment. Affix by means of clip. The following is a particular description
of the chalk holder and its different parts.
Tray A is made of brass or other suitable material. Clip B is steel, bent back
as shown at C. and countersunk at D.
Rivet E passes through holes F. G. H. The head of rivet rests in the
countersunk part of clip at F. and a small washer is fixed at the end H.
The head of rivet will not then scratch the blackboard or easel. The washer
prevents end of rivet being drawn through the tray.
When rivetting clip to tray, the bent-back part C. of clip is pressed a little
closer together, so that when rivetted to the tray there is an elastic pressure (like
that of a spring washer) of the bent back part of the clip, against the tray and
rivet head, so that when the chalk holder is affixed to any end of the blackboard
or easel, the tray will not easily tilt over. The tray and clip will revolve round
each other.
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 :-
1. The peculiar construction and method (on the principle of a spring washer)
of attachment of the onwing alin to the than allowing the tune and alin to moraliza

page_text: round each other, yet not allowing the tray to easily tilt over, because of the
pressure of clip to tray.
2. I claim the application of such a tray attached to a clip as described, for the
purpose of acting as a chalk holder, when affixed to a blackboard or easel.
Dated this 13th day of December 1892.
JOSEPH GREAVES.