Improvements in and connected with Supports or Easels for Blackboards.
Year: 1898

page_text: Date of Application, 14th Jan., 1898-Accepted, 30th Apr., 1898
COMPLETE SPECIFICATION.
Improvements in and connected with Supports or Easels for
Blackboards.
We, ADOLF LEBER and JOSEF LEBER, Subjects of the King of Prussia, German
Emperor, 14, Victoriastrasse, Coblenz, in the Province of the Rhine, Kingdom of
Prussia, German Empire, Manufacturers, do hereby declare the nature of this our
invention, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:
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My invention relates to improvements in blackboards, and its object is to provide
a simple adjustable and turnable board which may be used in connection with
adjustable holders for maps and the like. The invention consists essentially of
a blackboard not only supported in a suitable frame which can be raised or lowered
at the will of the user to the position desired, but also suspended on cords secured
at one end to the side-edges of the board and at the other end to the top cross-bar
of said frame so as to permit of turning the board on its horizontal axis and using
the back of the board; the invention further consists of two catches fitting within
suitable grooves of the vertical chief-standards thus binding the supporting frame
of the board to such standards in the positions desired; the invention finally con-
sists of slides fitting within a suitable groove of the top cross-bar and having
holders for maps or drawings or the like, as hereinafter more particularly explained.
Fig. 1 is a front view of our blackboard;
Fig. 2 represents a vertical section of the same;
Fig. 3 is a view from the rear;
Fig. 4 is a section on line xy, and
Fig. 5 is a section on line xy¹.
The board T is supported by the cross-bar S forming part of the frame S J J D.
The vertical bars J J of such frame are guided by holes provided in the cross-
bar G connecting the two chief-standards G G. The supporting bar S has suitable
projections not visible in the drawing which fit within the grooves g g of the
standards G G. The said grooves serve as guide-ways for the bar S when the
latter is raised or lowered.
The catches A furnished with springs a are attached to the supporting-bar S
in such a manner that their ends enter into corresponding grooves on the inside
of the standards G thus holding the frame S J, J, D in position.
The bolts M M are fastened to the side-edges of the board T. The cords BB
extend from those bolts M M to the bolts L L secured to the ends of the top
cross-bar D. In this way the board is not only supported by the bar S but also
suspended on the cords B B.
The frame SJJD is counterbalanced by the weight K running on the rails
attached to the chief rear-standards and provided with rollers F for permitting
of such running. The weight K is connected by cords c c passing around the
pulleys G¹ to the bar S¹.
The cross-bar D is provided with a groove receiving projections of the two
slides d. d. These slides serve as holders for maps, drawings and the like and

page_text: may be laterally dislocated according to the size of the maps or to the position
of the same. The small tables e e are provided for depositing the chalk.
It will be seen from the construction adopted that the black-board may be turned
so that the back takes the place of the front. For this purpose, the bottom edge
of the board is withdrawn from the supporting-bar S untill it has a sufficient dis-
tance from the frame for allowing the board to be turned and to be put with its
former top-edge on the bar S. The said manipulation is a very easy one.
In order to raise or to lower the board T together with the holders d d, the inner
ends of the catches A A are pressed together by hand. In consequence the other
ends of those catches will leave the grooves on the inside of the chief-standards,
thus permitting of a free vertical movement of the board. On taking away the
hand which keeps the catches pressed one to the other, the board is at once stopped
in the corresponding position.
When maps or drawings of different sizes are to be attached to the black-board
the holders à d are correspondingly moved laterally within the groove of the cross-
bar. The same operation is necessary for securing the maps or drawings to various
points of the cross-bar D.
Having now particularly described and ascertained the nature of our said in-
vention, and in what manner the same is to be performed, we declare that what
we claim is:
1.) The combination with the black-board T supported by a frame adapted to
be vertically moved, of the cords B B the one ends of which are secured to the
top cross-bar D of the said frame and the other ends of which are attached to the
side-edges of the board T respectively, substantially as described.
2.) The combination with the black-board T supported by a frame adapted to
be vertically moved, of spring-pressed catches A A attached to the bottom cross-
bar of the frame and adapted to be pressed together by hand, and the cords B B
the one ends of which are secured to the top cross-bar Ď of the said frame and the
other ends of which are attached to the side-edges of the board T respectively, sub-
stantially as described.
3.) The combination with the blackboard T supported by a frame adapted to
be vertically moved, of slides d d attached to the top cross-bar D of the said frame,
spring-pressed catches A A attached to the bottom cross-bar of the frame and
adapted to be pressed together by hand, and the cords B B the one ends of which
are secured to the top cross-bar D of the said frame and the other ends of which
are attached to the side-edges of the board T respectively, substantially as described.
Dated this 14th dox of Tanu 1900
GEO. THOS. HYDE,
No. 1, Broad Street Buildings, Liverpool Street, E.C.,
Agent for Applicants.