Improvements in Mechanism for Electrically Driving Roots' and like Blowers.
Year: 1899

page_text: Date of Application, 24th June, 1899
Complete Specification Left, 26th Mar., 1900-Accepted, 19th May, 1900
PROVISIONAL SPECIFICATION.
Improvements in Mechanism for Electrically Driving Roots' and like
Blowers.
We, ARTHUR DEVONSHIRE ELLIS and WILLIAM BATEMAN CRICHTON, both of
Vulcan Works, Thornton Road, in the City of Bradford, Engineers, do hereby
declare the nature of this invention to be as follows:-
This invention has for its object the arrangement and combination of certain
mechanism in such a manner that, what is generally known as a "Roots" or
like blower may be coupled to and driven by an electric motor running at a
considerably higher speed than that of the blower, and in such a manner that the
mechanism employed is positive and direct.
To one of the vane shafts
to the
wheel, and
worm
of the blower we
which gear respectively with
other vane shaft a
a right and left hand threaded worm, secured on a shaft that is coupled direct
to the electric motor armature, so that the worms rotate at the same speed as the
armature, and by the introduction of the worms and worm wheels the speed of
the vane shafts of the blower is considerably reduced.
We accomplish our object in the following manner.
secure a right hand
left hand worn wheel
In order to ensure the efficient working of the before mentioned gearing, we
form a suitable casing enclosing the right and left hand threaded worms, and
in this casing is a bath of oil in which the said worms rotate, thereby constantly
lubricating the high speed worms and wheels gearing therewith.
or
By arranging the worms and wheels in the manner described, the end pressure
thrust
on the shaft and armature is considerably equalized, but in order
to take up any "thrust" or end wear, we provide an adjustable pad at one or
at both ends of the combined armature and worm shafts for receiving the end
pressure.
0
COMPLETE SPECIFICA
Improvements in Mechanism for Electrically Driving Roots' and like
Blowers.
We, ARTHUR DEVONSHIRE ELLIS and WILLIAM BATEMAN CRICHTON, both of
Vulcan Works, Thornton Road, in the City of Bradford, Engineers, do hereby

page_text: declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
-
This invention has for its object the arrangement and combination of certain
mechanism in such a manner that, what is generally known as a "Roots" or
like blower may be coupled to and driven by an electric motor running at a
considerable higher speed than that of the lower, and in such a manner that the
mechanism employed is positive and direct.
In describing our invention in detail, reference is made to the accompanying
sheet of drawings, in which,
Fig. 1 represents an elevation of a "Roots"" or like blower in combination
with an electric motor.
Fig. 2 is a plan of the same.
Fig. 3 is an end elevation partly in section with the casing removed for more
clearly showing the gearing utilized for driving the blower."
Fig. 4 is a sectional elevation showing the driving gear.
Fig. 5 is a detached detail drawn to an enlarged scale partly in sectional
elevation, showing the mechanism at one end of the worm shaft employed for
retaining the said shaft in position, and
Fig. 6 is a similar view of the adjustable bearing of the worm shaft at the
opposite side of the worms near to the electric motor.
In carrying out our object, the vanes and other internal portions of the blower
are arranged in the manner as hitherto, and to one of the vane shafts A, we
secure a worm wheel B, arranged for a right hand threaded worm C, and to the
other vane shaft I), we secure a worm wheel E, suitable for a left hand threaded
worm F. These worms C and F are secured on shaft G, which is coupled in
any convenient and direct manner to the armature of an electric motor G of
ordinary construction, so that on putting the electric motor in motion, the
worms and F rotate at the same speed as the motor armature, and by the
introduction of the before mentioned worms and worm wheels, the speed of the
vane shafts A and 1), is considerably reduced below that of the shaft G directly
coupled to the motor armature.
In order to ensure the effectual working of the before mentioned gearing, we
form a suitable casing H enclosing the right and left hand threaded worins C
and and worm wheels gearing therewith, and in the space or reservoir R
formed by the said casing and division plate F1 of blower, is a bath of oil in which
the said worms rotate, thereby constantly lubricating the high speed rotary
worms C and F', and wheels B and E gearing therewith.
"
By arranging the worms and wheels in the manner described, the end pres-
sure or thrust" on the shaft G is considerably equalized, but in order to take
up any "thrust" in either direction on the shaft G, we provide at one end an
adjustable tail piece bush K for supporting one end of shaft G, one end of the
said bush is solid, for supporting the end of shaft G. and is adjustable in the
direction of the axis of said shaft, by the regulation of the tail screw D.
"
Upon the worm shaft G are two collars M, M, and between these collars and
bosses N, N, of external frame or casing, we preferably place making up collars
P. P, and the adjustment of the worm shaft journal bush Q, is regulated by
the threaded bushes S or other convenient and suitable means for "taking up
of the end wear of the collars so that by the adjustment of the journal bushes K
and Q in the manner as herein before described, the worms C and F may be
retained in their required position.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
The combination of an electric motor with a "Roots'" or like blower by worms

page_text: and worm wheels arranged substantially in the manner as nerember
and shown and for the purpose set forth.
1 1000
JOHN WAUGH,
Agent, Sunbridge Chambers, Bradford.