Improvements in Door-closing Apparatus.
Year: 1889

page_text: Date of Application, 16th Dec., 1889
Complete Specification Left, 15th Apr., 1890-Accepted, 14th June, 1890
PROVISIONAL SPECIFICATION.
Improvements in Door-closing Apparatus.
BENJAMIN PYBUS, 42 Juniper Street Moss Lane Hulme Manchester, Metal
Planer, do hereby declare the nature of this invention to be as follows:-
I cast in iron, box of circular form (A) 4 inches long by 2 in. diameter, with
internal slots (C.) at either side and flange (B) at top for fixing, also with internal
socket (D.) at bottom to receive shaft (F.) also loose angular lid (E), containing
shaft hole.
The upright vertical shaft (F.) with double angle cam (G.) is 5 inches long,
in. diameter and made of cast steel with square end at top to receive door.
The socket sleeve cam (H.) is cast in gun metal and finished in angular form at
back and front of top edge so as to receive shaft cam smoothly and lock it when in
position, the ledge or cuff (I.) at bottom of sleeve is to receive spiral spring (J.) and
pressure therefrom.
The spiral spring (J.) is made of 3 in. steel, 1 in. diameter and 3 in. long.
The whole is enclosed in the cast iron box (A) the spring (J.) first, the cuff (I.) of
sleeve cam fitting inside of spring and the vertical shaft of cam (G.) inside the
sleeve cam, and resting in socket (D.), at bottom when enclosed with the angle lid (C.)
which is screwed down with three screws under inch pressure. The pressure is
relieved when weight of door rests on shaft (F.).
The action of spring is effected thus:-the door being fixed, (diag. 1.) by means of
square socket at bottom on to square end of vertical shaft, on being opened
(diags. 2 & 4.) the angular cam (F.) attached to shaft actuates on the socket sleeve
cam by a sliding movement and is kept in direct position by two running slots, and
thus compresses the vertical spiral spring (J) and on the door being released the
spring naturally expanding raises the socket sleeve cam by upward pressure on the
angle cam of shaft, and returns the door to its normal position (diags. 1 & 3.) which
position is retained by the same spiral spring pressure of socket sleeve cam on angle
cam of shaft.
What I here claim, and what is new is the self closing of a door, double and single
action, with reliable and gentle motion worked by the compressed action of vertical
spiral spring on an angular sleeve cam, and double action angular cam of shaft in
vertical position, the spring also relieving part friction of shaft from footstep.
Having now particularly described and ascertained the nature of our invention
and in what manner the same is to be performed, I declare that what I claim is,
First. The vertical shaft double action cam in angular form, which in union with
the socket sleeve cam, causes the door to have a correct return.
Second. The socket sleeve cam, worked in slots, which sustains and forces pressure
of spiral spring and conjointly with the vertical shaft cam causes the door to have a
correct return.
Third. Simplicity of action and economy in production.
COMPLETE SPECIFICATION.
Improvements in Door-closing Apparatus.
1 BENJAMIN PYBUS of 42 Juniper Street Moss Lane Hulme Manchester in the
County of Lancaster Metal Planer 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 the construction of a double-acting cam door-spring for
the automatic closing of either double or single action doors, the principal feature of

page_text: novelty in the invention consisting in the combination in the manner hereinafter
described of a double-acting cam with a spiral spring.
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference to
the two sheets of drawings annexed to my Provisional Specification and the following
explanation thereof.
On sheet 1. of the drawings are four diagrams of which Nos. 1 and 2 are complete
front views of the invention with the box and lid shown in section, and Nos. 3 and 4
are back views of the same with the spiral spring removed.
On sheet 2 of the drawings are various views of the separate parts detached.
I cast an iron box A, of cylindrical form (see sheet 2) about four inches long by
two inches in diameter (more or less) having two internal slots C, (one at either side)
and a flange B, at the top for fixing into the floor, also with an internal socket Dat
the bottom (see section) to receive the lower end of the vertical shaft or spindle F,
the square portion of the upper end of which fits into a square socket at the bottom
of the door.
The vertical shaft or spindle F is made of cast steel and is provided with a double-
angled cam G, cast of one piece with it.
The sleeve cam H which is loose and capable of sliding thereon is cast in gun
metal and finished to an angular form at front and back so as to correspond with the
double-angled cam G, and lock it when in position (see diagrams 1 and 3 sheet 1.).
The lower end of the sleeve H is reduced in diameter as shown at 1 to receive the
upper end of the spiral spring J which exerts an upward pressure against the
shoulder of the sleeve, the lower end of the spring J fitting outside the socket D and
abutting against the bottom of the box A.
The sleeve H is provided with two feathers or projections K which take into the
internal slots or grooves C in the box A, so as to prevent the sleeve H from turning
round, at the same time that it is free to slide up and down in the said box on the
shaft or spindle F.
The whole is enclosed in the cast iron box A, the sleeve H being fitted onto the
vertical shaft or spindle F so that its notch fits onto the double angled cam G, and
the spring J placed in position, the foot of the spindle F is placed in the socket D
and the whole is fixed in position by means of the lid E which is fastened on with
three screws, the spring being thereby compressed about half an inch; the pressure
against the lid is however relieved when the weight of the door rests upon
the upper
end of the shaft or spindle F.
The action of the spring is as follows:-
The door being fixed (diagram 1) by means of a square socket at the bottom
thereof onto the square end of the vertical shaft F, on the door being opened
(diagrams 2 and 4) the double angled cam G fixed to the shaft or spindle acts upon
the sleeve cam H by a sliding movement, which (as the cam H cannot revolve)
depresses the latter causing it to compress the spiral spring J, and on the door being
released the reaction or expansion of the said spring raises the sleeve cam H by
upward pressure and the latter acting against the double angled cam G returns the
door to its normal position (diagrams 1 and 3) and by its continual upward pressure
retains it in that position.
By the use of my improved door spring as above described the automatic closing
of a door (whether double or single action) is effected with a gentle and reliable
motion worked by the action of a compressed vertical spiral spring on an angular
sleeve cam, in combination with a double-angled cam on the vertical shaft or spindle
which supports the door, the spring also relieving part of the friction of the spindle
from the footstep.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
The use of a doub'e-action angular cam fitted on the vertical shaft or spindle, in

page_text: combination with a corresponding sleeve cam sliding thereon, but not capable of
turning, and pressed upwards by a spiral spring so that when the shaft or spindle is
turned by the opening of the door the spiral spring is compressed, and when the
door is released the reaction of the spring raises the sleeve cam and the latter acting
on the double angled cam returns the door to its closed position.
Dated this 11th day of April 1890
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.