Improvement in Expanding Reamers.
Year: 1897

page_text: Date of Application, 31st Aug., 1897-Accepted, 15th Jan., 1898
Improvement in Expanding Reamers.
1, WILLIAM THOMAS BEARD, Gunsmith, of Boise City, in the County of Ada, and
State of Idaho, United States of America, 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 has relation to improvements in expanding reamers, and while
primarily intended for reboring shot guns, is likewise adapted for use wherever a
reamer of this class is needed; and the object is to provide a simple, efficient and
durable tool of this class.
To this end the novelty consists in the construction, combination and arrange-
ment of the same as will be more fully described hereafter and particularly pointed
out in the claims.
In the accompanying drawing the same reference characters indicate the same
parts of the invention.
Figure 1 is a perspective view of my improved expanding reamer;
Figure 2 is a longitudinal section of the same;
Figure 3 is a transverse section on the line of one of the adjusting screws; and
Figure 4 is a similar view through the central guide lug.
1 represents the cylindrical shank, formed integral with the longitudinal and
approximately semicircular fluted bar 2. 3 represents the movable or adjustable
semicircular fluted bar, secured to the bar 2 by the adjusting screws 4-4.
5 represents a radial rectangular guide slot formed in the end of the bar 2, which
receives the correspondingly formed tongue 6 on the end of the adjustable bar 3.
and 7 represents a rectangular guide slot formed in the shank 1, which receives
the integral guide tongue 8 on the contiguous and of the adjustable bar 3.
9 represents a longitudinal guide recess formed about midway in the plane
face 10 of the bar 2, and 12 represents an integral guide lug on the contiguous
plane face 13 of the bar 3.
The adjusting screws 44 are each provided with a collar 14 and an annular
groove 15, into which projects the conical end 16 of the retaining screws 17, to
secure said adjusting screws in place in the movable bar 3, and at the same time
permit their free rotation without allowing any end play.
As will be seen, these screws 44 provide for the parallel adjustment of the
movable bar 3 with reference to the fixed bar 2.
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
claim is:-
1. An expanding reamer comprising the cylindrical shank 1 and the integral
bar 2, in combination with the movable bar 3 and the adjusting screws 44, sub-
stantially as shown and described.
2. An expanding reamer comprising the solid cylindrical shank 1, the integral
fluted bar 2, provided with the guide slots 5 and 7, in combination with the movable
fluted bar 3, formed with the integral guide tongues 6 and 8, and adjusting

page_text: screws 44 adapted to adjustably secure said bar 3 to the stationary bar 2, sub-
stantially as shown and described.
3. An expanding reamer, comprising the cylindrical shank 1, provided with the
integral fluted bar 2, having the guide slots 5 and 7 and the central guide recess 9,
the parallel fluted bar 3, formed with the integral guide tongues 6 and 8 on its
outer ends and with the central guide lug 12, in combination with the adjusting
screws 44, provided with the integral collars 14 and grooves 15, and the retaining
screws 17 formed with conical ends 16 projecting radially into the groove in said
adjusting screws, substantially as shown and described.
Dated this 31st day of August 1897.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.