An Appliance for Trenching the Strings of Stairs and the like Articles.
Year: 1895

page_text: Date of Application, 23rd May, 1895
Complete Specification Left, 23rd Jan., 1896-Accepted, 23rd May, 1896
PROVISIONAL SPECIFICATION.
An Appliance for Trenching the Strings of Stairs and the like
Articles.
Alfred Thomas of 62 Craddock Street Cardiff in the County of Glamorgan
Foreman of Steam Joinery Works do hereby declare the nature of this invention
to be as follows:-
This invention consists of an iron frame fixed in a wood or other frame to which
is attached an iron template cut to the required shape of the article to be worked,
and adjusted to pitch by means of four slots in which 2 4" x 8" set screws working
in these slots, secure template. The article to be cut is laid on the top of this
template, and fastened in position by means of two iron thumbscrews.
This invention can be applied to any overhead spindle machine and worked by
means of a revolving cutter working perpendicularly over a fixed pin or guide.
The template is dropped over the fixed pin or guide and moved along its side
enabling the revolving cutter to trench its way to exact line of template.
This invention is for the trenching of stair strings to pitch required and for the
like articles.
Dated this 22nd day of May 1895.
An Appliance for Trenching the Strings of Stairs and the like
Articles.
ALFRED THOMAS of 62 Craddock Street Cardiff in the County of Glamorgan
Foreman of Steam Joinery Works 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 consists of an iron frame, marked "A on drawing, 2′ 8″ long
1' 4" wide by 2" 11" thick having one horn projecting 2" beyond each end in
line with side marked "B" on drawing and one horn projecting 31" beyond one
side in line with each end marked "C. C."
In side "B" is cut one slot 10" long by " wide and one slot 9" long by 1" wide,
each placed 2" from ends "C. C." leaving a space 9" long between slots.
"
To frame" A are fixed templates marked DE on drawing cut to the required
shape of article to be worked.
In template DE are cut two slots in each, 8" long by 1 wide these slots enable
the templates D. E to be set to the required pitch and secured to frame "A" with
four iron bolts working in slots of frame "A" and template "DE."
To the two projecting horns 3½" long in line with ends CC" of frame " A "
are fixed a piece of wood, marked "F" on drawing, 3′ 0″ long by 31" deep by
3" wide having two mortices 2" long by " wide cut through the 3" way of the
piece the horns in line with "C.C" are fixed in these mortices and secured with
four iron pins passing through wood and iron.
On one side of B (frame "A") is fixed a continuous piece of wood marked "G"

page_text: 3' 0" long by 2" wide by 14" thick and on the other side of "B" (frame "A") are
fixed two pieces of wood "H" (on plan) 5" long by 2" wide by 14" thick fixed at
each end and one piece of wood marked "I" 5" long by 2" wide by 14" thick fixed
in centre between slots, these are fixed with six 3" flush bolts passing through pieces
of wood respectively marked G, H, "1" and side "B" of frame "A."
Through piece of wood "F" are fixed two thumb screws marked "J." in the
centre of piece length ways and " down from each side, these thumb screws press
down the article, to be worked, against "F" securing it in position and in like
manner against blocks "H""H" and "I" for reversing of template.
The article to be cut is laid on the top of template and fastened in position by
means of thumbscrews "J."
This invention can be applied to any overhead spindle machine and worked by
means of a revolving cutter shewn on plan and marked "K" working perpendicularly
over a fixed pin or guide (fixed in bed of spindle machine), shewn on plan and
marked "L."
The template is dropped over the fixed pin or guide "L" and moved along its
side enabling the revolving cutter to trench its way to exact line of template.
This invention is for the trenching of stair strings to pitch required and for the
like articles.
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 :-
1. Strings of stairs can be trenched on any upright overhead spindle.
2. Trenches can be cut to any angle.
3. That the trenches are cut with wedge room and nosing in one operation
without removing string.
ALFRED THOMAS.