Improvements in the Method of Fastening the Blades of Coulters to their Stems.
Year: 1886

page_text: Date of Application, 17th May, 1886.
Complete Left, 15th Feb., 1887.
Complete Accepted, 15th Mar., 1887.
PROVISIONAL SPECIFICATION.
Improvements in the Method of Fastening the Blades of Coulters
to their Stems.
I PETER BUCHAN of the Caledonian Iron Works Caledonian Road Chichester in
the County of Sussex Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates to that description of coulter which is made in two parts and
consists in the method hereinafter described of fastening the blade to the stem.
For this purpose the stem is formed at the lower end with a socket or one side of a
socket of a section corresponding with that of the blade, in a suitable part of which
socket or side of a socket is fixed a pin or rivet into or on which is fitted a notch or
cavity formed in the front part of the blade which is secured as required in the socket
or side of a socket by means of a wedge-formed key inserted at the back of the blade,
or by bolts or rivets passing through the socket or half-socket and blade.
By this means the blade is securely fastened to the stem by the wedge-formed key,
bolts or rivets, retaining the said notch or cavity on the said pin or rivet and it can he
easily removed from the stem by merely withdrawing the key, bolts or rivets and
taking the front part of the blade off from the pin or rivet.
W. SPENCE & SON,
8, Quality Court,.
Agents for the Applicant.

page_text: I PETER BUCHAN of the Caledonian Iron Works Caledonian Road Chichester in
the County of Sussex 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 :-
My invention relates to that description of coulter which is made in two parts, and
consists in the method hereinafter described of fastening the blade to the stem.
For this purpose the stem is formed at the lower end with a socket or one side of a
socket of a section corresponding with that of the blade, in a suitable part of which
socket or side of a socket is fixed a pin or rivet into or on which is fitted a notch or
cavity formed in the front part of the blade which is secured as required in the socket
or side of a socket by means of a wedge-formed key inserted at the back of the blade,
or by bolts or rivets passing through the socket or half socket and blade.
By this means the blade is securely fastened to the stem by the wedge-formed key
bolts or rivets retaining the said notch or cavity on the said pin or rivet, and it can be
easily removed from the stem by merely withdrawing the key, bolts or rivets, and
taking the front part of the blade off from the pin or rivet.
In order that the invention may be fully understood I will proceed to describe it
more particularly by the aid of the accompanying drawings in which are represented
the improved coulter and stem above referred to.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a side elevation showing a coulter mounted in its stem.
Fig. 2 is a similar view of the same coulter detached from the stem.
And Fig. 3 is a section in the line a—b of fig. 1.
In these three figures the same letters of reference indicate corresponding parts.
A is the stem formed at the lower end with a socket F of a section corresponding
with the blade B.
E is the pin or rivet into or on which is fitted a notch or cavity D (fig. 2) in the
blade B, such blade B being secured in the socket F as required by means of the
wedge-formed key C inserted in the said socket Fat the back of the blade B, as shown
in Fig. 1.

page_text: I prefer to form the blade B and socket wedge-shaped as shown in section Fig. 3 so
that on tightening the key C the blade B will be tightened all round in the socket.
By withdrawing the said wedge-formed key C, it will be readily understood that the
blade B being allowed to be pushed back the notch or cavity D will become released
from the pin or rivet E.
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 I claim is;
The construction and arrangement of a coulter with a blade capable of being
detached from or fastened to the stem in the manner substantially as hereinbefore
described.
W. SPENCE & SON,
Agents for the Applicant.