Year: 1887

page_text: Date of Application, 15th Apr., 1887
Complete Left, 12th Jan., 1888
Complete Accepted, 17th Feb., 1888
I, JOHN HARPER of Auckland Hill West Norwood in the County of Surrey
Engineer do hereby declare the nature of this invention to be as follows:-
In conveyers for grain and other substances it has been suggested to employ a
shaft with a spiral spring attached to it working within a casing, the spiral spring
replacing the thread of an ordinary screw conveyer.
My invention relates to the means of attaching such spirals to the axial shaft. At
each place where an attachment is to be made I bore a hole transversely through the
shaft, (which is preferably hollow,) and through this hole I pass one end of a rod,
whose other end carries a hook of suitable size to hold the spiral.
In order to keep the spiral at a proper distance from the shaft, I provide a tube,
one end of which abuts against the shaft and the other end against the spiral; the
hooked rod passes through this tube, and is secured by a nut at the other side of
the shaft.
This apparatus forms a very cheap attachment, and besides, it has the great
advantage of being capable of turning, so that the same form can be employed for
any pitch of spiral."
In some cases I provide a socket for the end of the tube next the shaft to enter into
one side of this socket is rounded so as to fit on to the shaft and its other side is
provided with a circular recess to receive the end of the tube but leaving it free
to turn.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Attaching Helical Bars to an Axial Shaft.
I, JOHN HARPER, of Auckland Hill, West Norwood, 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 :-
In conveyers for grain and other substances it has been suggested to employ a
shaft with a spiral spring attached to it working within a casing, the spiral spring
replacing the thread of an ordinary screw conveyer.
My invention relates to the means of attaching such spirals to the axial shaft. At
each place where an attachment is to be made I bore a hole transversely through the
shaft, (which is preferably hollow,) and through this hole I pass one end of a rod,
whose other end carries a hook of suitable size to hold the spiral.
In order to keep the spiral at a proper distance from the shaft, I provide a tube,
one end of which abuts against the shaft and the other end against the spiral; the
hooked rod passes through this tube, and is secured by a nut at the other side of
the shaft.
This apparatus forms a very cheap attachment, and besides, it has the great
advantage of being capable of turning, so that the same form can be employed for
any pitch of spiral.
In some cases I provide a socket for the end of the tube next the shaft to enter
into one side of this socket is rounded so as to fit on to the shaft and its other side
is provided with a circular recess to receive the end of the tube but leaving it free
to turn.
In order that my said invention may be most fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed :-
Figure 2 is a transverse section of an axis naving a nenical bar attached to it in
accordance with my invention.
a is the axis, which is tubular, and b is the helical bar-c is a rod passing through
the axis, having at one end the nut d and at the other the hook e which holds the 30
bar b. is a tube surrounding the hooked rod-g is a saddle piece upon the axis a
provided as shown with a socket for receiving the tube.

page_text: 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 :-
.
1. Attaching helical bars to an axial shaft by means of a hooked rod passing
through the shaft and a tube surrounding the hooked rod and supporting the bar
substantially as described.
2.-The employment of a saddle piece fitting on the axis and provided with a socket
piece for receiving the end of the tube substantially as described.
3. My improvements in attaching helical bars to an axial shaft substantially as
described.