Prevention of Draughts, and as a Means of Retaining the same when Closed.
Year: 1887

page_text: Date of Application, 4th Apr., 1837
Complete Left, 4th Jan., 1888
Complete Accepted, 2nd Mar., 1888
Prevention of Draughts, and as a Means of Retaining the same
when Closed.
I, FREDERICK EDWIN PONTIFEX of 10 Chapel Street, Bedford Row, W.C.,
Engineer, do hereby declare the nature of the invention to be as follows:-
•
This invention relates to apparatus or devices for the purpose of excluding or
preventing the passage of air between the interstices of doors and windows and the
frames thereof.
The device consists of a rod of metal or other suitable substance fitting loosely into
a channel formed in the side of the door or window frame such rod being so fitted and
actuated if necessary by springs or other equivalent as to have a tendency to project
partially beyond the surface of the groove.
In the floor or in the frame work of the
door or window is formed a shallow groove or channel into which when the door is
closed the projecting portion of the rod enters. If the rod be applied to the bottom
of the door no springs will be required, the only necessary fittings being two slotted
plates let into the door at the ends of the groove, through which pass guide pins fixed
in the end of the rod. At the top of the door the rod may be fitted into a groove
formed in the frame the shallow channel being formed in the door. When applied at
the side it is immaterial whether the rod be fitted into the door or frame as springs
will be necessary in either case.
Whether applied at the top or bottom or on the latch or opening side of the door,
the rod in addition to acting as a draught excluder will also serve to keep the door
closed thereby enabling the ordinary latch to be dispensed with. To render the
apparatus noiseless as well as more effective the rod may be covered with felt or other
soft material.
•
1

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Prevention, of Draughts and as a Means of Retaining the same
when Closed.
I FREDERICK EDWIN PONTIFEX of 10 Chapel Street. Bedford Row W.C. Engineer
do hereby declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement
This invention relates to apparatus or devices for the purpose of excluding or
preventing the passage of air between the interstices of doors & windows & the frames
thereof.
The device consists of a rod of metal or other suitable substance fitting loosely into
a channel formed in the side of the door or window frame such rod being so fitted and
actuated if necessary by springs or other equivalent as to have a tendency to project
partially beyond the surface of the groove. In the floor or in the framework of the
door or window is formed a shallow groove or channel into which, when the door is
closed the projecting portion of the rod enters.
If the rod be applied to the bottom of the door no springs will be required the only
necessary fittings being two slotted plates let into the door at the ends of the groove
thro' which pass guide pins fixed in the ends of the rod. At the top of the door the
rod may be fitted into a groove formed in the frame, the shallow channel being formed
in the door. When applied at the side it is immaterial whether the rod be fitted into
the door or frame as springs will be necessary in either case.
Whether applied at the top or bottom or on the latch or opening side of the door
the rod in addition to acting as a draught excluder will also serve to keep the door
closed thereby enabling the ordinary latched to be dispensed with. To render the
apparatus noiseless as well as more effective the rod, may be covered with felt or other
soft material.
In the accompanying sheet of Drawings
Fig. 1. is a front view of a door (about full size) one side being partly in
section &
Fig. 2. is a detail (full size) taken on line y--Fig. 1.
: Like letters represent like parts
-
A is the floor line, B the door, C a tunnel shaped groove or slot cut in the bottom
of the door as shewn & running along the entire width thereof.
At each end of this slot a guide plate D of any suitable material or shape may be
attached so as to entirely close the ends of the groove C.
Running in the groove C & supported at its ends in the guides D is a roller E of
any suitable material or shape but I prefer to make it round of steel, iron or brass.
When the door is closed the rod E rests in a channel plate F also running the
entire width of the door. If preferred either the roller E or channel plate F or both

page_text: may be covered with felt or other suitable material. The channel F is preferably
made shallow as shewn in Fig. 2 as it will effectually exclude draught at the same time
being easily swept out & cleaned.
The bearing Das shewn in Fig. 2. is so constructed as to give the pin d free play
but I do not bind myself to this form as the pin might be of crank form & be
fixed in the door instead of running loose.
When the door is opened the roller E, being preferably round, will easily pass up &
over, such an obstacle as a mat or thick carpet G & riding in the bearings D will
rise up into the groove C as shewn in dotted lines in Fig. 2. & so remain until the door
is closed when it will simply drop into its original position...
It will be readily understood without further illustration how a roller or rod such
as E may be applied to the top or sides of a door being either let into the door or into
the frame and also how its projection from the groove or channel may be ensured by
springs applied to the pins d or in any other suitable manner.
Having now particularly described & 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. As a means for the prevention of draughts a roller or rod such as E placed in
a groove or channel C formed in the door or framework thereof, substantially as
described.
2. As a means for the exclusion of draughts or dust the combination of a rod or
roller such as E with a concave or channelled plate such as F in the manner
substantially as descrided.
Dated thin 441, dove at Lana 1000
FREDERICK EDWIN PONTIFEX.