Improvements in Rimers and the like.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Rimers and the like.
I, HERMANN SCHROERS, of Crefeld, in the Province of the Rhine, German
Empire, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to boring-tools, more especially to rimers and the like,
and has for its object to effect more quickly the purpose for which such tools are
employed, secondly, to effect this purpose with less expenditure of force than
hitherto, and thirdly to produce a smooth hole in the material to be bored or
rimed.
My improved rimer has further the advantage, that the same works down
automatically, or of itself, into the hole, and furthermore, that scarcely any
signs of wear or depreciation are perceptible upon the rimer even after long use
or after the same has been considerably and extensively employed for the required
purpose.
In order to make my invention more clear, I refer to the accompanying
drawing, in which:
Figure 1 shows a rimer constructed according to my invention, with straight
cutting surfaces,
Figure 2 is a modification having twisted or modified cutting surfaces C,
whilst
Figures 1 and 2 are plans.
Figures 1 and 2 are sections on the lines E F and G H, showing the screw-
threads.
The said rimer, as shown in the drawing, may be straight or twisted, and upon
the same are arranged or provided, screw-threads or like projections B, the pitch
of these said screw-threads increasing, as the said screw-threads ascend, the
boring-tool or rimer.
It will be clear, that when employing my improved boring-tool, that the
material severed from the hole, will separate in a kind of spiral or screw, from
which will be apparent that the screw-thread upon the boring-tool or rimer will
produce a clean and smooth hole.
To still further increase the smoothness of the hole, the part A is wider upon
my improved boring tool or rimer, which part A, as is apparent, would still
further slightly scrape the hole and impart to the same an increased smoothness
of surface.
The above mentioned combination produces therefore a smooth hole in a manner
hitherto not attained.
1
1000

page_text: Improvements in Rimers and the like.
I, HERMANN SCHROERS, of Crefeld, in the Province of the Rhine, German
Empire, Manufacturer, 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:-
This invention relates to boring-tools, more especially to rimers and the like,
and has for its object to effect more quickly the purpose for which such tools are
employed, secondly, to effect this purpose with less expenditure of force than
hitherto, and thirdly to produce a smooth hole in the material to be bored or
rimed.
My improved rimer has further the advantage that the same works down
automatically, or of itself, into the hole, and furthermore, that scarcely any
signs of wear or depreciation are perceptible upon the rimer even after long use
or after the same has been considerably and extensively employed for the required
purpose.
In order to make my invention more clear, I beg to refer to the drawing filed
with the Provisional Specification, in which:
Fig. 1 shows a rimer constructed according to my invention, with straight
cutting surfaces,
Fig. 2 is a modification having twisted or modified cutting surfaces C,
whilst
Fig. 1 & 2 are plans.
Figs. 1 and 2b are sections on the lines E F and G H, showing the screw-
threads.
The said rimer, as shown in the drawing, may be straight or twisted, and upon
the same are arranged or provided, screw-threads or like projections B, the pitch
of these said screw-threads increasing, as the said screw-threads ascend, the
boring-tool or rimer.
It will be clear, that when employing my improved boring-tool, that the
material severed from the hole, will separate in a kind of spiral or screw, from
which will be apparent that the screw-thread upon the boring-tool or rimer will
produce a clean and smooth hole.
To still further increase the smoothness of the hole, the part A is wider upon
my improved boring tool or rimer, which part A, as is apparent, would still
further slightly scrape the hole and impart to the same an increased smoothness
of surface.
The above mentioned combination produces therefore a smooth hole in a manner
hitherto not attained.
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:
In a differential screw-thread rimer, the combination with the shank (A) of the
rimer, of cutting-surfaces (C) arranged upon the said shank of the rimer, and of
screw-thread or like projections (B) which cross the edges of the said cutting
surfaces (C), the pitch of the said screw-threads (C) being arranged to increase

page_text: towards the upper part of the rimer-shank, whereby, a hole having no marks of
the screw-threads of the rimer, i.e. a smooth and clean hole is attained, sub-
stantially as set forth.
Dated this 26th day of June 1899
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.