Year: 1887

page_text: Date of Application, 5th May, 1887 ·
Complete Left, 12th Dec., 1887
Complete Accepted, 3rd Feb., 1888
I, LEONARD EDWIN SUNTER, of 18 Carlisle Street, Lambeth, in the County of Surrey,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to wood-screws that is to say screws which are used for, or
in connection with, wood-work of various kinds, and is designed to provide a screw of
this kind which may be readily inserted within the wood without the aid of a gimlet
brad-awl or other tool such as is usually employed to make an aperture before the
screw is inserted.
.
According to my invention I make the screw with the ordinary threads of any
desired kind but I also cut a groove or grooves or flutes in the metal from end to
end of the screw the said grooves or flutes being cut in a direction parallel with the
axis of the latter so that the screw-threads around the barrel or body will be inter-
rupted wherever the groove or flute exists.
I may employ either one, two, three or more flutes according to circumstances
and the edges thereof will be slightly undercut so as to provide cutting edges which
operate to cut the wood as the screw enters the same and thus cause the screw to
enter the wood readily without the necessity for making an aperture beforehand with
a gimlet or other instrument. Moreover as the particles of wood so cut and separated
lie in the said grooves the outward compression of the wood which occurs when
ordinary screws are used is avoided and therefore I am enabled to prevent the
splitting of the former which it is often exceedingly difficult to avoid with such
ordinary screws.
Although I have described the flutes as extending from end to end of the screw I
wish it to be understood that I do not confine myself to this extent of flute as the
latter may be cut in any other desired manner so long as the required cutting edges
and recesses are provided in such manner as to produce the desired result.
In some cases, instead of cutting the flutes in a direction exactly parallel to the
axis of the barrel or cylinder they may be cut in a direction inclined thereto.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.

page_text: I, LEONARD EDWIN SUNTER, of 18 Carlisle Street Lambeth, in the County of
Surrey, 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 :-
The object of my invention is to provide a screw which may be readily inserted into
wood without the aid of a gimlet, brad-awl or other tool such as is usually employed
to bore holes for the reception of screws.
According to my invention make the screw with one or more longitudinal grooves
or flutes which extend from end to end of the screw-threaded portion or shank.
My said invention is illustrated in the accompanying drawing in which
Figure 1 is an elevation of one of my improved wood-screws.
Figure 2 is a section on the line x, x, Figure 1, drawn to an enlarged scale.
Like letters indicate similar parts throughout the drawing.
The shank or body a is formed with a screw thread of the ordinary or any suitable
description. Grooves or flutes c are cut in the said shank in a direction parallel with
its axis so that the screw-thread 6 will be intersected and divided by each of the
said grooves or flutes.
One or more grooves or flutes e may be employed according to circumstances. The
edges c¹ of the said grooves are preferably slightly under cut thus providing cutting
edges, which enable the screw a to enter the wood readily and cut a thread therein
without the necessity for making a hole beforehand with a gimlet or other instrument.
Moreover as the particles of wood so cut and separated lie in the said grooves or
flutes c outward compression and splitting of the wood which often results from the
use of ordinary screws is avoided.
Although I have described the said grooves or flutes c as extending from end to end
of the screw-threaded portion I wish it to be understood that I do not confine myself
to the extent of the said grooves or flutes, as the latter can be recessed in any other
desired manner so long as the required cutting edges are formed. For instance the
grooves or flutes c, instead of being cut in a direction exactly parallel to the axis of
the screw a, can be cut in a direction inclined thereto.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
1 claim is;
A wood screws having one or more grooves or flutes cut therein either parallel or
inclined to its axis so as to form cutting edges, substantially as, and for the purpose,
set forth.
1001.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.