IMPROVEMENTS IN RIMERS AND APPARATUS TO BE USED THEREWITH
Year: 1880

page_text: LETTERS PATENT to Arthur Coventry, of the Firm of Smith and Coventry,
of Gresley Iron Works, Salford, in the County of Lancaster, Engineers and
Tool Makers, for an Invention of "IMPROVEMENTS IN RIMERS AND APPARATUS
TO BE USED THEREWITH."
PROVISIONAL SPECIFICATION left by the said Arthur Coventry at the
Office of the Commissioners of Patents on the 13th March 1880.
ARTHUR COVENTRY, of the Firm of Smith and Coventry, of Gresley Iron Works,
Salford, in the County of Lancaster, Engineers and Tool Makers. "IMPROVEMENTS
IN RIMERS AND APPARATUS TO BE USED THEREWITH."
The improved rimer at its cutting surface is first made cylindrical or nearly so,
and then has a series of flutes cut in its periphery at an angle to its axis of the
ratchet form, the cylindrical face of each tooth or flute being ground or
" backed
off" (as it is termed) to give clearance in cutting. The screw or diagonal direction
of the flute is such that when the rimer is rotated in the proper direction for
cutting, the screw incline of the flutes or cutting edges will tend to screw or force
the rimer out of the hole. By this means a clean, smooth, and perfectly true hole
is produced by the rimer.
The shank of the rimer is made taper (like a drill shank) to fit the socket in a
drill or other spindle by which it is to be rotated, and when the rimer is to be
used by hand my Invention consists in employing a key formed by a tube and
cross arms. The hole in the interior of this tube is made taper to fit the taper
of the rimer. This key will suit all rimers having the same size of taper shanks,
and the socket has a cross hole for driving out the shank of the rimer when
required.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Arthur Coventry in the Great Seal Patent Office on the 28th August
1880.
ARTHUR COVENTRY, of the Firm of Smith and Coventry, of Gresley Iron Works,
Salford, in the County of Lancaster, Engineers and Tool Makers. IMPROVEMENTS
IN RIMERS AND APPARATUS TO BE USED THEREWITH."
"
The improved rimer at its cutting surface is first made cylindrical or nearly so,
and then has a series of flutes cut in its periphery at an angle to its axis of the
ratchet form, the cylindrical face of each tooth or flute being ground or
off" (as it is termed) to give clearance in cutting.
backed
The screw or diagonal direction of the flute is such that when the rimer is
rotated in the proper direction for cutting, the screw incline of the flutes or cutting
edges will tend to screw or force the rimer out of the hole. By this means a clean,
smooth, and perfectly true hole is produced by the rimer.
The shank of the rimer is made taper (like a drill shank) to fit the socket in a
drill or other spindle by which it is to be rotated, and when the rimer is to be used
by hand my Invention consists in employing a key formed by a tube and cross
arms. The hole in the interior of this tube is made taper to fit the taper of the
shank of the rimer.
This key will suit all rimers having the same size of taper shanks, and the socket
has a cross hole for driving out the shank of the rimer when required.
Fig. 1 is an elevation or side view of my improved rimer with a handle applied,
the socket part of which is shown in section; Fig. 2 is an elevation of the rimer
and handle, showing the latter at a right angle to its position in Fig. 1; and Fig. 3
is an end view of the handle and rimer.
"
Fig. 4 is an elevation, Fig. 5 a longitudinal section, and Fig. 6 a cross section of
a shell" or hollow rimer without a shank part for rotating the rimer, the shank
being movable, and fitting the hole through the rimer.
The end of the shank a¹ of the rimer a is flattened and enters a cross slot b¹ in
the socket of the handle b, through which slot a wedge or other tool can be inserted
to detach the shank of the rimer from the socket when desired.
The end of the shank for the shell rimer fits the hole a³ in it, and the shank
has a cross pin in or projections from it to fit the notch a³ and turn the rimer a.
I have now particularly described the nature of my said Invention, and the
modes of carrying it into effect, and claim as my Invention,-
Firstly. Rimers constructed with the cutting flutes formed in a diagonal position
in relation to the axis upon which the rimer rotates, substantially as hereinbefore
described and illustrated by the Drawings.
Secondly. Shell rimers constructed with diagonal cutting flutes, substantially as
herein before described and illustrated by Figs. 4, 5, and 6 of the Drawings.
Thirdly. The combination of socketed handles (b) with taper shanks (a¹) of
rimers (a), substantially as hereinbefore described and illustrated by the Drawings.
In witness whereof, I, the said Arthur Coventry, have hereunto set my hand
and seal, this Fourteenth day of August, in the year of our Lord One
thousand eight hundred and eighty.