IMPROVEMENTS IN ATTACHING DOOR AND PROVISIONAL SPECIFICATION
Year: 1881

page_text: LETTERS PATENT to William George Macvitie, of the Cedars, Penns Lane,
Sutton Coldfield, near Birmingham, in the County of Warwick, Brass
Founder, for an Invention of "IMPROVEMENTS IN ATTACHING DOOR AND
PROVISIONAL SPECIFICATION left by the said William George Macvitie
at the Office of the Commissioners of Patents on the 9th August 1881.
WILLIAM GEORGE MACVITIE, of the Cedars, Penns Lane, Sutton Coldfield, near
Birmingham, in the County of Warwick, Brass Founder. "IMPROVEMENTS IN
ATTACHING DOOR AND OTHER KNOBS AND HANDLES TO THEIR SPINDLES."
The object of my Invention is to attach door and other knobs and handles
to their spindles in a simple and efficient manner, affording great facilities
for adjustinent and security, and also a ready means of detachment when
required.
"
I make on one of the faces of the square spindle a rack, or a series of parallèl
teeth, for a sufficient distance, each tooth of the rack having one side thereof
inclined and the other " square to the axis. To the "mount" of the knob or
handle I affix a suitable square tube, which. fits the said spindle easily and
accurately. Surrounding this square tube, and abutting upon or against the said
mount, I fit a buckle or catch (preferably of steel); two of the inner sides of this
buckle or catch are parallel to each other and act as guides to control its motion
by being in contact with the outside of such square tube. A third side of this
buckle or catch has a champered edge, which passes through a slot in the said
square tube. A suitable spring is so arranged that the catch is pressed in and
through the said slot. When the knob therefor is placed upon the end of the
spindle projecting beyond the door or the lock (as the case may be) the catch
passing through the square tube comes in contact with the sloping faces of the
rack on the spindle and is thereby lifted and allowed to spring back past each

page_text: tooth until the knob is "home" or close up to the lock or the door, when the
catch holds the knob upon the spindle securely and firmly, and the knob cannot be
removed from the spindle without removing the catch out of the tooth in which
it happens to be engaged. To perform this and remove the handle when desired
I make a small hole in the mount on the side opposite to the catch. By inserting
a small pin or brad awl in this hole the buckle can be pressed back against
the spring; the catch is thereby disengaged from the tooth and the handle can be
removed.
My said Invention is applicable to door knobs and other handles, whether
metallic, porcelain, or other suitable materials.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Georgo Macvitie in the Great Seal Patent Office on the
9th February 1882.
WILLIAM GEORGE MACVITIE, of the Cedars, Penns Lane, Sutton Coldfield, near
Birmingham, in the County of Warwick, Brass Founder. "IMPROVEMENTS IN
ATTACHING DOOR AND OTHER KNOBS AND HANDLES TO THEIR SPINDLES."
The object of.
f.my
Invention is to attach door and other knobs and handles
to their spindles in a simple and officient manner, affording great facilities
for adjustment and security and also a ready means of detachment when
required.
33
I make on one of the faces of the square spindle a rack, or a series of parallel
teeth, for a sufficient distance, each tooth of the rack having one side thereof
inclined and the other "square" to the axis. To the "mount of the knob or
handle I affix a suitable square tube, which fits the said spindle easily and
accurately. Surrounding this square tube, and abutting upon or against the said
mount, I fit a buckle or catch (preferably of steel); two of the inner sides of this
buckle or catch are parallel to each other and act as guides to control its motion
by being in contact with the outside of such square tube. A third side of this
buckle or catch has a chamfered edge, which passes through a slot in the said
square tube. A suitable spring is so arranged that the catch is pressed in and
through the said slot.
"
When the knob therefor is placed upon the end of the spindle projecting beyond
the door or the lock (as the case may be) the catch, which passes through the
square tube, comes in contact with the sloping faces of the rack on the spindle and
is thereby lifted and allowed to spring back past each tooth until the knob is
"home or close up to the lock or the door, when the catch holds the knob upon
the spindle securely and firmly, and the knob cannot be removed from the spindle
without removing the catch out of the tooth in which it happens to be engaged.
To perform this and remove the handle when desired I make a small hole in the
mount on the side opposite to the catch. By inserting a small pin or brad awl in
this hole the buckle can be pressed back against the spring; the catch is thereby
disengaged from the tooth and the handle can be removed.
My said Invention is applicable to door knobs and other handles, whether
metallic, porcelain, or of other suitable materials.
And in order that my said Invention may be clearly understood reference is
made to the accompanying Drawings, wherein similar letters indicate similar parts
in the several Figures.
Fig. 1 is a side view of the spindle a with the notches b. One side of each tooth
is shewn to have an inclination, the other being vertical or "square" to the spindle.
The slanting faces of the teeth lift the buckle and catch until the handle is properly
in position, when the contact of the catch with the vertical face of a tooth keeps
the handle fixed.
Fig. 2 is a front view of the buckle c; the two sides d, d¹, act as guides and the
catch a is chamfered to a sharp edge.
Fig. 3 is a side view of the mount and square tube; fis the mount, and g is the
square tube; h is the slot, which allows the catch e to pass into the notches of the
spindle.
Fig. 4 is an end view of the square tube and face view of the mount.
Fig. 5 is a side view of the mount and square tube in position upon the
spindle. The spring i is riveted to the square tube, and being in contact with the
lower internal edge of the buckle the catch of the buckle is kept in a notch of the
spindle.

page_text: Fig. 6 is a longitudinal section of one knob attached to one end of a spindle.
The bole k is for the purpose of inserting a pin or brad awl, whereby the buckle
can be pressed in such a manner as to cause the catch e to leave and become
detached from the teeth of the spindle, when the handle can be drawn off the
spindle.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I wish it to be
understood that what I claim and desire to be secured to me by the herein before
in part recited Letters Patent is,—
The novel arrangement and combination of mechanism together constituting my
improvements in attaching door and other knobs and handles to their spindles,
substantially as and for the purposes herein before described and shewn on the
Drawings, or any mere modification thereof.
In witness whereof, I, the said William George Macvitie, have hereunto set
my hand and seal, this Eighth day of February, in the year of our Lord
One thousand eight hundred and eighty two.
WITT TARE
ARODAN MOITIE