Improvements in Fastenings and Guards for Doors.
Year: 1889

page_text: Date of Application, 19th Sept., 1889
Complete Cancification Inft 1011
1000
Accentnd
10th
1000
PROVISIONAL SPECIFICATION.
Improvements in Fastenings and Guards for Doors.
We, WILLIAM SNELGROVE, of The Nest Kings Norton in the County of
Worcester Engineer, and WILLIAM BEILBY AVERY of the firm of Messrs. W. &
T. Avery Mill Lane, Birmingham in the County of Warwick, Weighing Machine
Manufacturers, do hereby declare the nature of this invention to be as follows:-
Our invention has for its object to secure doors in such a manner that not only may
a slight opening be given for ventilation or for other purposes without at the same
time rendering the door liable to be completely opened from the outside, such a
result being obtained by the use of the ordinary door chain; but also to provide that
the door so fixed open at any position cannot be moved either one way or the other,
without the fastening or guard being first released.
The degree or extent to which the door can be opened we fix or limit by suitable
division upon our improved guard slide.
We carry our invention into effect in one arrangement that we adopt by con-
structing a metal link guard plate or slide having a slot or grouve formed within it.
and along the upper edge of this groove we formi slots sorrations or divisions, while
the lower edge we prefer to construct plain and flat: at the inner end we allow this
slot or groove to finish or enter into a larger circular or suitably formed hole which
may or may not be fitted with a slide or spring cover, and beyond this hole in the
plain part of the continued metal or surface of the guard plate we form an eye or
hole to enter upon or to be attached to a staple or bracket which we secure to the frame
or door lintel. This staple or ordinary bracket for receiving and carrying the guard
plate we attach to the lintel by screws in any ordinary manner.
Upon the door we attach a bracket carrying a moving bolt or knob ended lever
having a pivot upon which it can turn freely; or instead of the said bolt or lever we
may use a fixed arm of suitable shape with an enlarged head: the knob or ball shaped
end of this lever or arm we cause to enter the end large hole or opening of the guard
plate, while the stem or plain part of the lever is of a width suitable for the width of
the slot or groove within the guard plate and the holes. serrations, or divisions along
the groove or slot are such as to permit of the stem entering them freely.
We attach the knob ended lever to the door in such a position that the end large
opening in the guard plate can only be slipped over the knob from the inside when
the door is closed.
The guard plate being attached to the staple on the door frame or lintel, and the
knob shaped lever or arm, or bolt attached to the door, it is quite easy and simple to
cause the door to be held open at any position by placing the knob first through the
end hole or spring of the guard plate and then, by opening the door, causing the stem
or narrow part of the lever to move along to the hole within the groove or slot,
And when it is in this
which will give the necessary required opening of the door.
position the door is effectually secured against either opening or closing except from
manipulation or partial release of the knob lever or bolt, say by lifting the guard
plate. Such manipulation or partial release of the lever from the guard plate will permit
either the closing of the door, or the opening of the door to the extent of the length of
the guard plate. The complete opening of the door (sufficiently to admit a person)
can only be effected by detaching the guard plate from the knob entirely, and such
detachment can only be effected from the inside when the door is closed.
We also adopt another method of construction by forming the lever or bolt with a
hinge so that it can be caused to enter into the opening at the end of a fixed side

page_text: frame attached to the lintel or door frame, and then to fit into recesses or between
keys or projections standing up from the surface of the channel or groove.
In this manner the door may be held securely at any desired position depending
upon the peg or recess that it has been secured to.
We construct our improved guards and fastenings in metal, and we vary the details
of construction to suit any particular door: but we employ the same feature as
herein before described for securing and retaining the door in any desired position."
We sometimes form the guard plate or slide by making it the reverse to a groove
or slot, that is to say, we construct the guard plate with a projecting head or Hange
upon which we cause a forked or jaw ended lever to slide, the end of the guard plate
flange being interrupted to admit of the attachment of the sliding knob or lever: we
also cut grooves or form serrations in the plate or flange to secure the door in any
desired position as herein before described.
Dated this 18th day of September 1889.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for Applicants.
COMPLETE SPECIFICATION.
Improvements in Fastenings and Guards for Doors.
We, WILLIAM SXELGROVE, of The Nest King's Norton in the County of Worcester,
Engineer, and WILLIAM BEILBY AVERY of the firm of Messrs. W. & T. Avery Mill
Lane Birmingham in the County of Warwick. Weighing Machine Manufacturers, do
hereby declare the nature of this invention and in what manner the same is to
he performed, to be particularly described and ascertained in and by the following
statement:-
Our invention has for its object to secure doors in such a manner that not only may
:1 slight opening he given for ventilation or for other purposes without at the same
time rendering the door liable to be completely opened from the outside, such a result
being obtained by the use of the ordinary door chain: but also to provide that the
door so fixed open at any position cannot be moved either one
without the fastening or guard being first released.
way or the other.
The degree or extent to which the door can be opened we fix or limit by suitable
division upon our improved guard slide.
We carry our invention into effect in one arrangement that we adopt by con-
structing a metal link guard plate or slide having a slot or groove formed within it.
and along the upper edge of this groove we fort slots serrations or divisions, while
the lower edge we prefer to construct plain and flat; at the inner end we allow this
slot or groove to finish or enter into a larger circular or suitably formed hole which
may or may not be fitted with a slide or spring cover, and heyond this hole in the
plain part of the continued metal or surface of the guard plate we form an eye or hole
to enter upon or to be attached to a staple or bracket which we secure to the frame or
door lintel. This staple or ordinary bracket for receiving and carrying the guard
plate we attach to the lintel by screws in any ordinary manner.
Upon the door we atiach a bracket carrying a moving bolt or knob ended lever
having a pivot upon which it can turn freely or instead of the said bolt or lever we
may use a fixed arm of suitable shape with an enlarged head; the knob or ball shaped
end of this lever or arm we cause to enter the end large hole or opening of the guard
plate, while the stem or plain part of the lever is of a width suitable for the width of
the slot or groove within the guard plate and the holes, serrations, or divisions along
the groove or slot are such as to permit of the stem entering them freely.
We attach the knob ended lever to the door in such a position that the end large
opening in the guard plate can only be slipped over the knob from the inside when
the door is closed.

page_text: The guard plate being attached to the staple on the door frame or lintel, and the
knob shaped lever or arin, or bolt attached to the door, it is quite easy and simple in
cause the door to be held open at any position by placing the knob first through the
end hole or spring of the guard plate, and then, by opening the door, causing the stem
or narrow part of the lever to move along to the hole within the groove or slot, which
will give the necessary required opening of the door. And when it is in this position
the door is effectually secured against either opening or closing except from
manipulation or partial release of the knob lever or bolt, say by lifting the guard
plate. Such manipulation or partial release of the lever from the guard plate will
permit either the closing of the door, or the opening of the door to the extent of the
length of the guard plate. The complete opening of the door (sufficiently to admit a
person) can only be effected by detaching the guard plate from the knob entirely, and
such detachment can only be effected from the inside when the door is closed.
We also adopt another method of construction by forming the lever or bolt with a
hinge, so that it can be caused to enter into the opening at the end of a fixed side
frame attached to the lintel or door frame, and then to fit into recesses or between
keys or projections standing up from the surface of the channel or groove.
In this manner the door may be held securely at any desired position depending
upon the peg or recess that it has been secured to.
We construct our improved guards and fastenings in meial, and we vary the details
of construction to suit any particular door: but we employ the same feature as
herein before described for securing and retaining the door in any desired position.
We sometimes form the guard plate or slide by making it the reverse to a groove or
slot, that is to say, we construct the guard plate with a projecting head, or flange
upon which we cause a forked or jaw ended lever to slide, the end of the guard plate
flange being interrupted in admit of the attachment of the sliding knob or lever; we
also cui grooves or form serrations in the plate or flange to secure the door in any
desired position as hereinbefore described.
In the accompanying drawings.
Fig. 1 is a front elevation of our guard or link plate A secured to the staple D an
the ordinary eye plate E.
Fig. 2 is a front elevation of the door bracket or knob plate G with the fastening
or movable knob or arm Ft attached by means of the riveted end of the arm F and
the washer f.
Fig. is a sectional elevation showing the method of securing the knob or arm to
its bracket and
Fig. 4 is a general front elevation showing the fastening and guard in position
upon the door K and intel or frame FL.
The groove or channel B within the guard or link plate allows the stem of the
knob F to work freely along, and the recesses or serrations C. C. which we form upon
the upper surface of the groove, receive and retain the guard bolt or knob stem F¹:
while the larger end or hole at the end of the channel permits the free entrance and
removal of the knob F.
The eye plate E we secure to the frame or lintel H by means of screws gl; and we
similarly secure the knob plate G to the door K.
By this our improved method of constructing door guards, we are enabled to place
the door slightly open for ventilation or other purposes without the possibility of the
fastening or guard being released or in any way tampered with.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. The construction of door guards or fastenings having serrated or grooved link
plates such as A, and a channel or passage such as B for receiving a projecting bolt
or stem such as F', for the purposes herein before described and substantially as set
forth in the accompanying drawings.

page_text: 2. The combination and arrangement of a door fastening or guard such as A with a
movable or swivelling or turning knob bolt or bracket such as F, G, for the purposes
herein before described and substantially as set forth in the accompanying drawings.
Dated this 18th day of June 1890.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for Applicants.