A Blocking and Stopping Device for use in connection with Doors' and Windows.
Year: 1897

page_text: Date of Application, 15th July, 1897-Accepted, 9th Oct., 1897
COMPLETE SPECIFICATION.
A Blocking and Stopping Device for use in connection with Doors'
and Windows.
I, GUSTAV KRAUSE, Merchant, of 40 Rudersdorfer Strasse, Berlin, in the Empire
of Germany, do hereby declare the nature of my said invention, and in what manner
the same is to be performed, to be particularly described in and by the following
statement:-
This invention relates to an improved blocking and stopping device for use in
connection with doors and casement windows, serving to prevent their being opened by
unauthorized persons and also, when in an open position, securing them against
closing under the action of an air draught.
In the accompanying sheet of illustrative drawings: Figs. 1 and 2 are a horizontal
and vertical section respectively, through a door casing or frame showing the safety
device in position. Figs. 3. and 4 are a plan and side elevation, respectively, of the
safety device! Figs. 5 and 6 are perspective views of modified forms of construction,
Figs: 76 and 9 are a longitudinal section, plan and side elevation respectively
showing a further modified form of construction.
The blocking and stopping device consists of two, three or more prongs a arranged
side by side like the prongs of a fork and bent at a suitable angle near one end.
The two outer prongs are formed from a single piece of wire bent to a U shape in
plan and shape in side elevation the middle prong or prongs being suitably fixed
to the base of the U shaped piece. The arms or prongs are straight, corrugated, or
of sinuous frin; in the latter two cases they present a larger area and therefore a
larger friction surface. In the modification shown in Figs. 3 and 4 the device is
provided with three prongs, the central one of which is bent to a sinuous shape.
The prongs shown in Figs. 5 and 6 are formed from straight wire, the ends a² thereof
being pointed.
In the modification shown in Figs. 7, 8 and 9 the device consists of a metal plate b
bent to a L shape, the downwardly bent portion of the plate when resting on its two
ends being notched so as form sharp pointed teeth 62. To the other extremity 61 of
the L shaped plate a straight plate c is rigidly connected passing over the top
surface of the L plate; the superposed plate c may also form an integral part of
the L shaped plate. In either case this superposed plate c is resilient and has the
tendency to bear flatly against the upper surface of the L plate b. The free extremity
of the superposed plate can be brought out of contact with the top surface of the
L plate b to a greater or smaller extent by means of a set screw d or otherwise, in order
to allow of the device being adjusted to doors and windows with a more or less thick
sill or water edge. The device may also be made without a top plate c and without
adjusting mechanism d.
As illustrated in Figs. 1 and 2 this improved device is, when being used, so placed
against the door that the points a² or 62, respectively, of the bent wire or bent plate
lie farthest away from the door. When the door is tried to be opened with the
device placed as just described the bottom edge of the door is forcibly passed partly
over the oblique or wedge surface a a a or b, respectively, and the pointed parts are
forced into the floor, thus efficiently preventing the door from being opened. In order

page_text: to prevent an open door or window from self-closing under the action of an air
draught, the device is of course placed between such door or window and their
respective frame or casing.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A blocking and stopping device for use in connection with doors and casement
windows, serving to prevent their being opened by unauthorized persons, on the one
hand, and their automatic closing under the action of an air draught, on the other
hand, the characteristic feature of said device being a wedge shaped piece formed
by two or more compound wire prongs (a) with sharp points (a2), and the top or
contact surface of which (a) is straight, corrugated or sinuous shaped.
2. A constructional form or modification of the device claimed by the first claim,
according to which the wire prongs are substituted by a L shaped metal plate (b)
notched so as to form pointed teeth (62) at the extremity of the downwardly bent hook
portion.
3. A constructional modification of the device ascertained in the first and second
claims, according to which an adjustable contact plate c is superposed on the top of
the plate surface b.
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.