Improvements in Band Saw Guides.
Year: 1895

page_text: Date of Application, 3rd Apr., 1895-Accepted, 7th Sept., 1895
COMPLETE SPECIFICATION.
Improvements in Band Saw Guides.
WILLIAM ALLEN HOWELL, of the Village of Jarvis, in the County of
Haldimand, in the Province of Ontario, in the Dominion of Canada, Physician,
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 relates to an adjustable anti-friction band saw-guide consisting of
a wheel, the periphery of which has three grooves, each of different size, and
either one to admit and engage with the back edge and sides of a band saw which
revolves said wheel, and is so arranged and devised to revolve in conical centre
bearings and capable of adjustment horizontally, side angled, forward and
rearwards.
The objects of my improvements are, first to provide an adjustable and revolving
guide for band saws which shall have permanent and durable qualities, second, to
provide means for the complete and enduring lubrication of the conical bearings
of the revolving guide wheel, and third, to afford facilities for the proper adjust-
ment of the elements of the device independently of each other in respect to the
perpendicularity of the band saw.
I attain these objects by the device illustrated in the accompanying drawing in
which:-
Figure 1, is a side elevation of my invention showing at the right hand end, or
properly the rear of the device a vertical bar, broken, connected to the rear of band
saw machines, and which is common to said band saw machines, and generally in
position, some five to eight inches in rear of the band saw, this vertical bar is used
to support various devices, having wooden blocks for guiding the saw, and is
capable of vertical adjustment to greater or less distances from the table of the
band saw machines, to suit different thicknesses of wood to be sawed.
Figure 2, is a plan of the same, and
Figure 3, is a front elevation of the detached adjustable hub, having a lower
concaved shank, with upper and lower flange, and centrally located elongated
aperture, for bolt, to fasten the same to the convexed end of permanent, yet
adjustable guide.
Similar letters refer to similar parts throughout the several views.
In the drawing the said vertical and broken rear bar which is capable of vertical
adjustment, and applied to most band saws, is indicated by A, and supports the
whole of the device by means of its lower hub B.
A round horizontal bar C, passes through the hub B, and is capable of being
secured to a more forward or rearward position by means of set screw D. This
bar C, is provided with hub E, having adjusting set screw 2, and lower concaved
shank F, with upper and lower guide flanges G, and elongated aperture H, in order
to receive, and allow the rear convex end of guide 1, to be adjusted and fastened
thereto by means of bolt J, which is a part of said guide I.
The double armed bearings, K, are joined at their rear end, which is in shape of
a dove tail, and fits into the said guide I, and are capable of horizontal adjustment
by means of screw, 3, passing through lug 4, which is a part of said arms, and into
the guide 1. The angle counter screw 5, which when screwed into the slide and
tight against the end of said dove tailed arms, holds the said arms firmly in desired
position.
When this device is in operation the band saw, M, engages with the anti-friction

page_text: wheel N, operating in the central annular groove, O, of the wheel, thus revolving
said wheel with its extended journals P., the outer ends of which are conical and
revolve in their adjustable bearings R, which conform to the conical ends of said
journals. These rigid bearings R, which pass through the hubs S, of arms K,
can with the wheel N, be adjusted, horizontally, either way, and held in
position by means of screws T, of said bosses S. This horizontal adjustment acts
similar upon the wheel as the adjustment of the double arm with dove tail,
excepting the latter can be adjusted more accurately by means of the said screws 3,
and 5, which will regulate the wheel to an exactness in relation to the saw, which
is a very important element. Another very important element in this device
consists of the adjustment of the wheel to a more forward or rearward position by
means of the bub E, sliding on its bar C, and held in position by screw 2.
The band saw runs perfectly free in its groove and leaves it without any
friction, on account of the exactness in the adjusting qualities of the device as
referred to.
The said grooves in the wheel, three in number, are of different size, to suit
larger or finer saws as the case may present.
In order to adjust the wheel at a slight angle, either way, from direct line of the
sides of saw, when straight as shown, the bolt J, may be loosed and the double
arm moved either way by means of the elongated aperture in concave shank, the
convex end of slide conforming to said concave having the flanges G, which act as
guides, thus when this slide and shank are secured together again by said bolt, the
saw may be run at a slight angle when necessary to slightly adjust the same.
To lubricate the conical journals of wheel the bearings R, have horizontal
channels, 6, which extend from the oil cups U, to the conical points of said journals
of wheel, these oil channels being indicated by broken lines in the drawing.
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
claim, is :-
saw,
Ist. In an adjustable anti-friction band saw guide the combination of the band
saw wheel, having annular grooves to admit the back and part of sides of a band
and provided with extended journals P, having conical ends, adapted to
revolve in bearings R, which pass through bosses S, of double arm K, and capable
of adjustment and the oil channels, provided with oil cups U, substantially as
described.
2nd. The band saw guide wheel having annular grooves, and provided with
journals P, having conical ends, adapted to revolve in adjustable bearings R, in
bosses S, of double arm K, and held in position by screws T, in combination with
the oil cups in position immediately over the outer ends of oil channels, 6, the rear
dove tail end of said double arm, capable of sliding in guide I, by means of screw 3,
and held by means of screw 5, in said guide which has a convex rear end to fit in
concave of shank F, substantially as described.
3rd. The combination of the grooved guide wheel, having conical end journals
adapted to revolve in adjustable horizontal bearings R, which conform to said
journals, said bearings passing through and supported by the bosses S, and held in
adjusted position by screws 1, the extended double arm of said bosses having dove
tail end and lug 4, and capable of adjustment in guide I, by means of screws 3
and 5, rear end of said guide being convex to conform to the concave and flanged
shank F, and held by means of bolt J, the upper hub E, of said shank provided
with set screw 2, and bar C, capable of sliding in hub B, of vertical bar A, and
held by means of set screw D, substantially as described.
Dated this 20th day of March 1895.
JOHN H. HENDRY,
Agent.