A Spring Book Clasp.
Year: 1896

page_text: Date of Application, 19th Feb., 1896-Accepted, 21st Mar., 1896
COMPLETE SPECIFICATION.
A Spring Book Clasp.
I, FREDERICK WILLIAM GOLBY of 36 Chancery Lane in the County of
Middlesex, Patent Agent do hereby declare the nature of this invention and
in what manner the same is to be performed as communicated to me by Ad. Gramper
of Bremen Germany Manufacturer, to be particularly described and ascertained in
and by the following statement :-
The subject of this invention is a book clasp for note and other books which not
only presses the two covers together when the book is closed, but also when the
book is open holds one half tight and prevents the sheets from turning over, and
likewise clasps the pencil against the leaves when the book is closed.
In the accompanying drawings Fig. 1 is a perspective view of a book provided
with a clasp made according to this invention; Fig. 2 is a section of same, and
Fig. 3 is part of an elevation of the back cover B of the book. Figs. 4 to 6 are
similar views of a clasp of slightly different shape. The same letters of reference
are used to indicate corresponding parts in the various figures.
The book furnished with covers A and B bears the book clasp in such a manner
that one shank a, Figs. 1. 2. 4. and 5, is freely movable on a hinge eel whilst the.
other shank b. is fastened to the back cover B in the ordinary way by passing the
points or plates on the shank b. through the back cover B, and bending them
down on the inside thereof as shewn in Figs. 2, 3, 5, & 6. At the projecting part
of the shank b, which for the sake of ornamentation can be bored or stamped,
sockets c are formed in which engages the hinge pin c of the shank a.
This hinge
pin e is reduced in diameter between its ends and a spiral spring fis wound on such
reduced diameter with one free end lying across the abutment d of the hinge pin c,
this spring pressing together the two clasped shanks a and b. With this object the
ends of the spiral spring flie against the shanks a and b of the book clasp, thus
the end flies against the fixed shank b. and the end flies against the movable
shank a. The shank a can, for the sake of easy opening and closing, have a curled
end a' and at the point of the book edges either be bent round, as in Fig. 2, or be
curved outwards according to whether the closing spring be weaker or stronger
and the book edges more or less cut away. The shauk a is in shape the form of the
book cover A and the book edges, thus accomodating itself to the strength of the
latter. By means of such a clasp as described a pencil i of corresponding size can
be held tight against the edges of the book whilst closed without the aid of a
special pencil holder.
my
Having now particularly described and ascertained the nature of said
invention and in what manner the same is to be performed I declare that what I
claim is,
A book clasp distinguished by two shanks secured together by means of a spring
hinge formed by winding a spiral spring on the binge pin c of one shank and
passing said pin into the hinge sockets c' on the other shank, one of said shanks being
secured to one of the covers of the book while the other is movable on the hinge,
substantially as and for the purpose herein before described and illustrated in the
accompanying drawings.
Dated this 19th day of February 1896
F. W. GOLBY,
36 Chancery Lane, London, W.C.