Year: 1889

page_text: I, The Right Honorable ROBERT HARRIS CARNWATH DALZELL, Earl of CARNWATH
of Carnwath House, Fulham in the County of Middlesex (a communication to me
from abroad by Arthur Edward Dalzell, Captain 1st. Battalion Oxfordshire Light
Infantry now stationed at the East Indies, 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 tool is a combination pick and spade or mattock.
It consists of an ash handle capped with steel, a blade and a socket piece. The
blade is at one end a pick point, and at the other a spade.
The socket is rivetted to the blade. The capped end of the handle fits into the
socket and is connected by a steel pin on which the handle turns.
The socket is rather more than semi-circular and is provided with screw threads.
The capped end of the handle is also provided with screw threads and the handle
being fitted to the socket the threads of both complete a circle.
On the upper part of the handle are also threads with the same radius as the
socket.
The tool forms a pick or mattock when the handle is perpendicular to the blade,
the threads of both socket and handle being together, a ring with a female thread
is screwed on to clamp both together.
The tool forms a spade when the handle lies on the pick end of the blade, and
is clamped to it by the ring and threads on the upper part of the handle.
The socket has two flanges between which the handle lies when the tool is used
as a shovel or spade, these flanges are bent, the bend being made diagonally to
clear the head of the pin.
When the pick end is fastened to the handle the ring should have an equal
bearing on it, for this reason the pick end is very slightly bent outwards. The end
of the pick is countersunk in the steel strap of the handle.
That part of the spade on which the handle is rivetted, and also that portion
within the inner line is flat. The point is raised above this to form a hollow, the
sides of the hollow having a uniform slope on all sides.

page_text: The threads have all edges rounded off, the ring fitting the threads exactly.
The tool is of steel and ash wood and does not weigh more than 3 lb. 8 oz.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a front elevation and Figure 2 is a side elevation of an entrenching tool
made in accordance with my invention. Figure 3 shows to a smaller scale a side
elevation of the tool arranged for use as a pick. Figure 4 is a full size longitudinal
section of part of the tool. Figure 5 is an elevation of a portion of the handle
showing the screw threads thereon. Figure 6 is a side elevation of the handle cap.
Figure 7 is a front elevation of the same. Figure 8 is a section on the line A B in
Figure 6 Figure 9 is a plan of the socket and shows also the handle and the handle
cap in section. Figure 10 is a plan of the blade. Figure 11 is a section at C. D.
Figure 10 Figure 12 is a plan of the screw clamping ring.
The wooden handle a has the cap secured to it by means of the straps 61 forming
part of the cap. On one of the straps the part screw threads 2 62 are formed; and
near the end of the cap are other part screw threads &³ ³. One of the straps is
indented at 64 to house the pick point. c is the blade and d is the socket, it is open
on one side and is rivetted to the blade-d' d' are part screw threads upon the socket.
e is a steel pin passing through the sides of the socket and through the cap band
rivetted over at the ends but so as to allow the handle to turn freely upon the pin.
fis the screw clamping ring which when screwed on to the socket and on to the
threads 63 of the handle cap secures the blade to the handle in position for the tool to
be used as a pick. When the same clamping ring is screwed on to the threads 62 over
the pick point, the blade is secured to the handle in position for the tool to be used as
a spade or shovel. The pick point is so formed that the ring when in the last
mentioned position bears firmly and evenly upon it.
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
clain is :-
1. An entrenching tool substantially as described and consisting of a compound
spade and pick blade jointed to a handle and capable of being fixed by a clamping
ring with the blade in position either parallel to the handle or perpendicular thereto.
2. In an entrenching tool as stated in the preceding claim the screw clamping ring
engaging with part screw threads upon the handle cap and socket upon the blade.
3. An entrenching tool substantially as described and represented by the annexed
drawings.
Dated this 20th day of February 1080

page_text: A clerical error in the communication in the original Specification having
been amended by the Patentee with the consent of the Comptroller, the printed
Specification will now read as shown below:-
A communication to me from abroad by ARTHUR EDWARD DALZELL, Captain,
2nd Battalion, &c.