IMPROVEMENTS IN THE CONSTRUCTION OF ENVELOPES FOR ENCLOSING LETTERS AND OTHER PAPERS
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by Julius Lebhar and Sylvain Salomon
Benjamin Gutmacher at the Office of the Commissioners of Patents on the
14th February 1880.
JULIUS LEBHAR and SYLVAIN SALOMON BENJAMIN GUTMACHER, both of Finsbury
Pavement, in the County of Middlesex. "IMPROVEMENTS IN THE CONSTRUCTION
OF ENVELOPES FOR ENCLOSING LETTERS AND OTHER PAPERS."
This Invention consists in improvements in the construction of envelopes for
enclosing letters and other papers, and refers, first, to so forming the envelopes
from strips of paper that very little waste of material occurs; and secondly, to the
construction of the flap, whereby the opening of the envelope after the same has
been closed is greatly facilitated, whilst at the same time all danger of injuring
the papers enclosed by the adhesion of the flap thereto is entirely avoided, and
the surreptitious opening of the envelope cannot be effected without damaging
the flap.
The paper which is to constitute the envelope is cut into a form of one piece,
which is of the same width, or nearly so, through its entire length, with the
exception of that part which is to form the front of the envelope, on each side of
which part small projecting pieces are left; the latter are turned down on the said
front, and that portion of the form which is below the latter is then turned up and
secured to the projecting pieces by any suitable adhesive material, and thus forms
the back. The remainder of the form constitutes the flap, and is of sufficient size
to cover or nearly cover the back when folded down. The said flap is perforated
from top to bottom at a little distance from each side, and the portions thus
separated from the body of the flap are provided with any suitable adhesive
inaterial.
The nature of our said Invention will be more clearly understood by reference
to the accompanying Drawings, in which Figure 1 is a representation of the paper
cut into the desired form, the position of the projecting pieces when turned down
being shown in dotted lines; Figure 2 shews the envelope formed and with the
flap open; and Figure 3 shews the envelope closed. The same letters of reference
indicate like parts in the several Figures. a is the front of the envelope; b, the
projecting pieces at the side thereof; c is the back of the envelope, and d is the
flap, e being the perforations in the latter; and f the side portions, on which the
adhesive material is placed.

page_text: Envelopes constructed as above described are closed by moistening the adhesive
material on the portions fand then pressing the flap d on to the back c, and when
it is required to open the envelope the flap d is lifted, which causes the same to
tear along the lines of perforations and thus to become separated from the portions
f, which remain adhered to the back c.
Instead of forming the projecting pieces b at the sides of the front a they are,
in some cases, formed on the sides of the back c.
The construction of the envelopes as above described permits of the utilisation
of the back thereof, and the underside of the flap for advertising purposes.