Improvements in Machinery and Appliances for the Grinding and Polishing of Metallic Mounts, Caps, Casings, and other similar Articles for Metallic Bedsteads and Various other Purposes.
Year: 1886

page_text: Improvements in Machinery and Appliances for the Grinding and
Polishing of Metallic Mounts, Caps, Casings, and other similar
Articles for Metallic Bedsteads and Various other Purposes.
We, FREDERICK HOSKINS of the Firm of Hoskins and Sewell of Bordesley
Birmingham in the County of Warwick Manufacturer, and CHARLES HARVEY of
Yardley near Birmingham, aforesaid, Manager of Works, do hereby declare the nature
of this invention to be as follows:-
Our invention has reference to machinery and appliances to be used or employed in
the grinding and polishing of the exterior surfaces of bedstead and other metallic
mounts, caps, casings, knobs, and other like objects for various purposes as hereinafter
described; by which improvements, the articles enumerated are ground and polished,
or only ground or polished as the case may be, in a simpler and more efficient manner
than has heretofore been practised; and further, by our improvements, the said articles
do not require to be subjected to the action of any acid, in order to remove scale or
oxide, prior to polishing.
We will describe our invention in connection with the polishing of a bedstead
mount.
In carrying out our invention, we take an ordinary bed frame, having mounted a
considerable distance above it, two parallel rotating shafts, each carrying suitable
pulleys, by which means, the shafts are rotated, and also by which means, the rotary
motion of each shaft is communicated to grinding or polishing bobs, carried by two
spindles or axes mounted and turning within bearings formed at the lower extremities
of two swinging frames, jointed and mounted at their upper ends upon the principal

page_text: shaft carrying the driving pulleys before named; and which said hanging or swinging
frames and bobs at the ends of spindles carried by them, admit of approaching
or receding from each other, so as to bring them up to the work placed between
them.
The two swinging frames are connected together by a band or cord passing over
the pulleys respectively mounted upon each of them, with the terminal end of the
cord attached at one end to one of the frames, and at the other end to a foot lever; so
that the grinder or polisher has only to press the foot lever in order to bring the
acting surface of the bobs up to their work which is between them.
Springs take the swinging frames and bobs out of action on pressure being relieved
from the foot lever.
The object to be ground or polished receives a slow rotary motion by frictiona
contact from a roller placed beneath it.
be communicated if necessary,
Or motion may
by gearing the work spindle, and the work-driving spindle together.
Instead of carrying the bobs or buffs, or grinding wheels upon the ends of two
swinging frames, one only may be used, with the other fixed.
The polishing bobs or buffs, or grinding wheels are constructed as follows.
We give to the periphery of the polishing buffs, bobs or grinding wheels, the exact
shape or configuration of the object to be polished, buffed or ground; that is, the
peripheries of the polishing or grinding expedients are of a like breadth, and
of a like shape to the object to be polished or ground, instead of employing
thin or narrow polishers or grinders as is commonly practised. Thus in the polishing
of a bedstead mount by bobs or buffs constructed according to our invention, the
concaves, convexes and flats thereof, are brought to bear collectively upon the
equivalent convexes, concaves and flats of the mount.
The bobs or buffs and polishing wheels may be made in ring segments threaded
upon a central axis.
The spindle for holding the mounts while being polished is preferably split or
divided at one end, and which split parts are opened out or expanded, by a central
rod, with a coned end, which is fed up to its work, by a screw or wedge cotter; so
that the mount is held firmly upon its end, by the bulging outwards of the split or jaw
like parts.
To operate upon a mount, fix it to the end of its spindle as described, when the
roller in contact with it, gives a slow rotary motion thereto. The polisher or grinder
then depresses the foot lever which brings the rotating bobs or buffs near to each
other, and upon the object to be polished, the necessary pressure being applied through
the medium of the cord or band passing around the pulleys before named. Rotary
motion being communicated from the bob spindle to the pulley shaft by a band or by
other gear.
The lever which brings together the swinging frames instead of being actuated by
the foot, may be brought into action by the hand, and the former taken out of position
by weights, instead of springs.
In order to equalize the wear of the bobs or felts, the spindle with its chuck end,
which carries the mount, admits of being reversed at intervals, so as to change the
wearing parts of the bobs.
The bobs or spindles instead of being carried by swinging frames, they may be
carried by slides, working within or upon a suitable frame, and with rotary motion
communicated to spindles of the bobs or buffs by pulleys as before. Or this last
named action may be reversed, by making the bobs revolve in a stationary head or
frame, and the objeet to be polished or ground, rotated and moved forward to the
polishers or grinders by a slide. In this case, the polishers or grinders may if
necessary be made non-rotating, with the acting surfaces shaped to the contour of
the object to be polished or ground.
In employing more than two bobs, I prefer to mount their axes within concentric
or radial slots, cut within a face plate, in order to bring or move them inwards,
centrally upon the work, which may be carried out by a box cam, or by a like
mechanical equivalent.

page_text: The polishing or grinding material may be automatically fed to the bobs by a band
or web, (plain or having studs upon it) which passes through the lower portion of a
hopper, wherein the polishing or grinding material is stored, and motion is communi-
cated to the said band from the main shaft or other convenient source. This band
during the polishing is constantly moved forward, and so automatically feeds the
polishing or grinding material to the bobs or grinders in any desired quantity.
The application of our invention to the grinding and polishing of other cylindrical
articles, differs in no essential respect from its application to a bedstead mount as
herein before described.
Dated this Ninth day of November 1986
FREDERICK HOSKINS.
_ CHARLES HARVEY.
By Henry Skerrett,
Agent for Applicants

page_text: Improvements in Machinery and Appliances for the Grinding and
Polishing of Metallic Mounts, Caps, Casings, and other similar
Articles for Metallic Bedsteads and Various other Purposes.
We, FREDERICK HOSKINS of the firm of Hoskins and Sewell of Bordesley,
Birmingham in the County of Warwick, Manufacturer, and CHARLES HARVEY of
Yardley near Birmingham, aforesaid, Manager of Works, 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 :-
Our invention has reference to machinery and appliances to be used or employed
in the polishing and grinding of the exterior surfaces of bedstead and other metallic
mounts, caps, casings, knobs, and other like objects for various purposes as hereinafter
described; by which improvements, the articles enumerated, are polished and ground,
or only ground or only polished, as the case may be, in a simpler and more efficient
manner than has heretofore been practised; and further, by our improvements the
said articles do not require to be subjected to the action of any acid, in order to
remove scale or oxide, prior to polishing.
Figure 1 represents partly in vertical section, and partly in side elevation, a
polishing machine, constructed according to our invention, and which said machine
is shown in the act of polishing a bedstead mount.
Figure 2 is a front end elevation of the same. This view shows the position of the
mount to be polished which is represented in section, also the polishing and supporting
bobs with respect to the mount; and further, it also shows the means whereby the
polishing bobs are put into and thrown out of action. This throwing out and
putting in action of the bobs as hereinafter fully described, automatically takes the
work axis carrying the mount, out of position.
Figure 3 exhibits a vertical section of the front lower part of the said machine,
showing the axes or centres of the work spindle and rest-bob spindle; also the means
whereby the rest-bob is raised and lowered to the proper height, according to the
object to be bobbed or polished.
Figure 4 represents the rear or back end of the machine, and shows the wheel
gearing and driving mechanism, by which means, rotary motion is imparted to the
respective working shafts or axles.
Figure 5 respesents a complete horizontal section, with some of the parts in
elevation of the said machine, and which said section and top side plan, is taken upon
the dotted lines A B figure 1.
Figure 6 shows an enlarged sectional view of the fore part of the chuck, with a
mount upon it, and with the nose end of the expander rod, lying within a like coned
inside part of the chuck.

page_text: Figure 7 represents a solid bob or buff, whose periphery is shaped to the counter-
part, or to the converse of that of a mount to be buffed, polished, ground, or
the like.
Figure 8 represents a bob, buff, grinding or polishing wheel, made in ring segments,
threaded upon a central axis, and clamped between end collars or nuts.
Thus, the polishing bobs, buffs or grinding wheels, have their peripheries shaped
to the exact configuration of an object to be polished, buffed or ground; and which
said polishing or grinding expedients, are of a like breadth, as well as of a like shape
of the said objects, instead of employing thin or narrow polishing discs of the breadth
only, of a single flat or concave, as is now commonly practised.
In the polishing of a bedstead mount by bobs or buffs, constructed according to
our invention, the concaves, convexes and flats thereof, are brought to bear
collectively upon the equivalent concaves and flats of the object being polished, buffed
or ground.
Figure 9 represents a modification of the hanging swinging portion of the machine.
Figure 10 represents another form of hanger connection, and with a square bearing
block in its rectangular middle part; this allows the frame to take both a sliding and
part rotary movement.
Figure 11 is an end elevation with the hanger arm in section, and the bearing
block in elevation.
Figure 12 represents another form of my invention, for bringing the bobs up to
their work, this is carried out, by making the bearing axes of the bobs, work within
movable and fixed curved radiating slots, cut respectively within fixed and movable
face plates, which on the latter being rotated, the bobs approach and recede from
each other.
Figure 13 is a section on the dotted lines E F figure 12, while the said figure 12 is
a section on the dotted lines C D, figure 13.
The same letters of reference, indicate corresponding parts, in figures 1 to 8, both
inclusive of the drawings.
a is the framing of the machine, consisting of a bed, with vertical uprights and
cross tops, and upon which, plumber block bearings a³, are mounted. These said
bearings, carry parallel shafts, b, b', having keyed upon them, driving pulleys b³, 63, 64,
and 6, as best seen in figure 1.
The pulleys 62, 63, are the main driving pulleys, receiving their motion, from any
convenient source of power, while the pulleys 6, 6, drive respectively, right and left
hand bob spindles c, c', by bands passing over pulleys c², c³. These rotating spindles
carry at their front ends, bobs d, d, whose peripheries are shaped to the contour of
an article to be polished or huffed. These said spindles are coned at their front ends
near the buffs, which work and turn within gun metal sleeve like bearings c¹, carried
by the lower extremities of two hanger, or swinging frames e, e, jointed and hung
at their upper ends, upon the principal shafts 6, 6º, carrying 'the driving pulleys
before named.
The bobs are secured against bosses c', and secured in position, by nuts, secured
upon the front ends of the said spindles.
c is a hooded collar for excluding the material employed in polishing, from the
bearings, while the pulleys and other parts of the spindle are kept laterally in position,
by bushes c*.
e
The hanger or swinging frame has upper and lower double bearings e², e³, so as
to give extended bearings to itself and to the bob spindles.
The hanger or swinging frames, carry loose spindle pulleys f, f, over which a
cord g weighted at its ends, passes; and which said cord, serves as a means, for the
bringing of the bobs up to their work, which is placed between them.
is a cam, for the opening out of the hanger or swinging frames, for the purpose
of taking the bobs from the work, when the same is required to be removed, or a
fresh mount placed upon the chuck, as hereinafter described.
The opening out is effected by a lever h³, secured to the cam, whose acting faces,
press upon fixed pulleys i, i, secured upon the swinging framings respectively.

page_text: The cam is mounted and turns upon an axis, secured to a fixed cross-bar, attached
to the opposite fixed framings.
jis an adjustable chuck, (partially divided longitudinally from its front end)
carried by the work spindle 7, working within an extended bearing sleeve m² of
a frame m.
The other end of the frame has a like extended sleeve m³, which partially rotates
around a spindle n, which is made to work, or expand the chuck segments, by a
forward thrusting movement of the expander rod o, which works within the axis of
the work spindle 1, and whose nose end o² is coned, and fits in a like coned part,
disposed between the partially divided segments of the chuck; so that the moving
forward of the said expander rod, expands the jaws of the chuck, and grips internally,
the mount k, to be held.
The chuck is secured to the work axis, by a screw pin; while connection between
the axis n, and the expander rod o, is made by an arm o³, working loosely upon the
respective ends of the rod and spindle.
The spindle n, which is worked by a handle n², has a reciprocating movement
imparted to it, by means of a helical slot n³ cut within it, and working over or upon
a fixed pin n', secured to, and carried by the main bearing framing a, where through
the said spindle passes and works; so that on the handle n² being partially rotated,
the spindle n is reciprocated, which carries backwards and forwards the expander
rod, for affixing and releasing the mount on the chuck.
p, p², p³, are fast and loose pulleys, the middle one p², is keyed upon an independent
sleeve part p, and upon which said part, a pinion p is mounted, which gears with an
intermediate toothed wheel p, which in its turn, gears with a larger toothed wheel p²,
mounted upon the working axis 1, and through which the expander rod passes and
works, to and fro, for fixing and releasing.
Keyed upon the work axis, is a pinion p³, which gears with a larger pinion, or a
wheel p³, and then again through the intervention of the pinion po, (see figure 4)
motion is communicated to the pinion p", which is upon the axis of the bearing bob,
marked q, as best seen in figures 1, 2 and 3, while the arrangement of the gearing is
clearly shown at figure 4.
The large toothed wheel p', is upon the work axis, and drives the mount on the end
of the chuck.
The wheel p works the axis q³, of the rest bob q, which is carried by a slide q³,
having rack teeth upon one side, which are in gear with the teeth of a pinion q',
carried by an axis q. This rest bob q is shown separately in section figure 8B.
This pinion is rotated, by a lever q³, having a quadrant slotted plate 4 at the
back of it, for determining the adjustment, and for affixing the said rest bob in
position, as best seen in figure 2, and in vertical section figure 3. This adjustment
is necessary, in consequence of varying sized mounts, which require the rest-bob to
be lowered or elevated accordingly, so as to bring the mount central, with respect to
the rapidly rotating bobs d, d, which are driven from bands, which receive their
motion from pulleys 64, 65, carried by the main shaft b.
12
The intermediate wheel and pinion p", p10 are carried by a quadrant arm p., which
moves with the frame m, and arm p¹³, carrying the pinion p, and which said arm pl
has an extended sleeve bearing or pipe p¹³, which comes between the reciprocating
spindle n, and the sleeve upon which the fixed pulley p² is mounted.
Thus on the raising of the work-axis, and the gear, and parts carried by it, the
intermediate gear wheels and axis p³, p¹º are out of action.
The frame m carries an upright arm m', while one of the hanger or swinging
frames e, carry a standing out bar or arm e; so that on the opening out of the said
hanger frames by the cam h, the bar or arm e presses back the arm m', and turns
the frame m backwards (as indicated by the arrow) upon the reciprocating spindle n
as a centre, and so automatically takes the work out of position between the bobs;
and on the other hand, on the removal of the cam from between the fixed pulleys
or drums i, i, the work falls in position, as represented in figures 1, 2 and 5.
To operate upon a mount, first place it upon the chuck end (when contracted) then

page_text: raise the lever n², which rotates the spindle n; and in consequence of the pin n*, working
within the groove n³, the said spindle is moved longitudinally forwards, and carries.
with it, the expander rod o, whose nose end o² is forced between the split parts of the
chuck, which opens out the chuck jaws, and firmly grips or holds the mount upon it.
The operator then removes the cam, (when the hanger or swinging arms e, e, are
held open) which allows the bobs to fall with their peripheries upon the mount or
object to be polished, while the necessary pressure is applied, by the gravitating effect
of the weight, suspended over the pulleys through the intervention of the cord.
Rotary motion is cominunicated to the bobs and mount, and rest bob, by gear and
means herein described; so that the bobs are rapidly rotated on the two opposite sides
of the work, which is also rotated.
The means which brings together the frames, instead of being actuated by the
gravitating effect of a weight, may be brought under the direct influence of a
workman's foot, which works a lever, to which one end of the cord is connected.
In order to equalize the wear of the bobs or felts, the spindle, or the chuck which
carries the mount, may be reversed in its direction of motion at intervals, so as to
change the wearing parts of the bobs; and such reverse motion may be effected, by
crossing the bands, or by other means.
The mount instead of being held and supported by a chuck, it may be held and
supported, between the rest-bob and the polishing bobs, without a chuck. Thus, the
mount to be ground, polished, burnished or finished, is simply placed between the
shaped peripheries of the respective bobs; so that the convexes of the mount, lie
within like concaves in the bobs, and so likewise with respect to the convexes.
Although we have only described polishing bobs, yet other bobs, such as grinding
bobs, emery bobs, burnishing bobs, and the like, may be employed, and constructed
in the manner as described.
In polishing bobs, the periphery or polishing part, may be cut from a ring of buff
or other grinder or polisher, and secured upon a bush of wood, or other support,
and through the middle thereof, the driving spindle passes-This modification is
represented at figure 8^.
Instead of the peripheries of the bobs, being made of the whole breadth, and
counterpart of a mount to be polished, we may make the breadth of the said bobs,
equal to one half, or two thirds the breadth of a mount; so that in this case, we
employ two bobs Or on the other hand, we may so shape the periphery of the bobs,
that the whole of the concaves, are done by one bob, while the convexes or flats are
done collectively by other bobs.
Further, we wish it to be also understood, that our new or improved machinery as
described, may be worked, or provided with, single ring bobs of the ordinary kind,
instead of our new or improved bobs, which grind, polish, or both grind and polish at
the same time, the whole surface of a mount at one operation.
The modification represented in figure 9, shows a frame, provided with, a swivelling
lower part, which allows the bob carried by it, to partake of the contour of the mount,
or to always follow the annular undulations thereof.
b is a hanger or swinging frame, turning upon the main shaft a as a centre-c, c, are
pulleys, secured fixedly to the said shaft-6 is the lower swivelling part of the
hanger, while 63 is an upright spindle, having a collar 6ª, upon which the said lower
part rests The said spindle 63 is extended further upwards, and works within a
hollow bush 6, connected by a cross bar to the opposite sides of the hanger; and
which spindle is kept in position. and made to work centrally by a set pin b
d is the bob, rotating and swivelling upon the said lower part, and d³, d³, are bob
pulleys, which receive their motion from the pulleys c, c, upon the main shaft. The
bob and pulleys rotate upon a spindle e, secured within end bearings at the two
opposite lower parts of the said swivelling frame. f is a screw pin, passing vertically
through the upper and lower frames. This is for the purpose when required, of
keeping the swivelling portion of the frame rigid to the other portion, as we purpose
only using one swivelling end at a time.
On the lower part of the frame requiring to swivel, the pin or cotter is removed.

page_text: By mounting the bob upon a lower swivelling part as described, besides the
swinging motion for the bringing of the bobs to their work, the said bobs have an
independent semi-rotary motion, which allows the said bob to follow perfectly all
irregularities in the contour of the mount.
In figure 10, the lateral motion is got at the top of the frame, instead of at the
bottom, which is accomplished, by making the shaft pass through a square bearing,
which works within a rectangular shaped hole in the top of the frame; so that on
the frame being brought up to its work, it can wriggle or give a shuffling like
movement to the bob which is carried by it.
Figure represents a side elevation of the bearing part, with the hanger frame
in section.
6 is the frame, carrying at lower end, a bob or bobs. a is the main axis upon
which the frame turns, and c is a movable bearing block, which slides in the
rectangular opening b.
Instead of carrying the bobs or buffs upon the ends of two swinging frames, one
bob only may be movable, while the other remains fixed.
Figure 12 represents partly in elevation, and partly in vertical section, another
form of our invention, for the bringing together of the polishing bobs, between
which, an object to be polished is placed. The arrangement consists essentially of a
carrying frame and radially slotted plates, wherethrough both framing and slots, the
bearings of three bob spindles, pass; and which said spindles, with their bearings, are
caused to approach, or recede from each other, by worin, or tangent gearing.
Figure 13 represents a transverse vertical section of figure 12, but with one of the
outer plates removed, and which said removed outer plate, is indicated by dotted
lines.
a is a drum like framing, and b, b are outer face plates, with flanges near their
peripheries, which fit accurately within the ends of the drum frame, and are there
fixedly secured.
The said plates, or frame ends b, are provided with three radially disposed slots b, b,
which cross coincidentally, slots d', of inner rotating plates d. These plates d are
connected together, and turn with a central axis f, whose outer ends work within
bearings made within the front plates or ends.
The slots d', are curved and radiating slots, and through these said slots, and the
slots 62 of the front plates b, (of which the latter are fixed) bob spindle bearings e³, of
spindles e, pass.
The plates d, are collectively rotated by a worm c, (carried by a worm axis c², and
rotated by a winch c',) engaging with tangent teeth d³, made within the periphery of
one of the plates d; so that on the turning of the said axis c³, a semi-rotation is given
to the plates d, and by such rotation, the bearings e², and the axes e carried by them,
are made to approach or recede from each other, by the change of position of the said
slots d', and thus compelling the bearings and spindles, to move up the fixed slots b³.
The spindles carry at their back ends, pulleys g, while at the other ends e³, they
carry bobs, and between them, the work to be polished, is placed.
The spindle carries a pulley c³, which has wound around it, a cord or rope,
suspending a weight, and which said weight, turns the axis in a direction, for always
keeping the bobs up to their work, with a pressure proportional to the weight
employed.
When in use, turn the axis ², in a back direction, when the bobs are made to recede
from each other, and the article to be bobbed, placed between them. The releasing of
the said axis c², allows the weight to rotate the spindle in the reverse direction, and
bring the bobs with the pressure of the weight upon the objects being operated
upon.
The bobs or spindles instead of being carried by swinging frames, they may be
carried by slides, working within, or upon, a suitable frame, and with rotary motion
communicated to spindles of bobs or buffs, by pulleys as before. Or this last named
action may be reversed, by making the bobs revolve in a stationary head or frame,
and the object to be polished or ground, rotated and moved forward to the polishers

page_text: or grinders, by a slide. In this case, the polishers or grinders may if necessary, be
made non-rotating, with the acting surfaces shaped to the contour of the object to be
polished or ground.
The polishing or grinding material may be automatically fed to the bobs, by a band
or web, (plain or having studs upon it) which passes through the lower portion of a
hopper, wherein the polishing or grinding material is stored, and motion is communi-
cated to the said band from the main shaft or other convenient source. This band
during the polishing is constantly moved forward, and so automatically feeds the
polishing or grinding material to the bobs or grinders in any desired quantity.
The application of our invention to the grinding and polishing of other cylindrical
articles, differs in no essential respect from its application to a bedstead mount as
hereinbefore described.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim is.
First. The means herein described of grinding, polishing, or finishing collectively,
or at one operation, the pattern, or annular forms, of a bedstead or other mount, cap,
or the like, substantially as described and illustrated.
Secondly. The improvements in grinding, polishing, finishing and other bobs, as
herein described and illustrated in figures 7, 8 and 8A, in which the peripheries are
made of the breadth, and shaped to the exact converse, of the whole pattern, of a
mount or other object, to be operated upon; so that the whole pattern of the said
mount, or other object, is bobbed or operated upon, collectively, or at the same time,
substantially as described and set forth.
Thirdly. Making bobs of the kind as herein described in the preceding claim, of a
number of ring like discs, or ring segments, and which when clamped together, con-
stitute a bob, whose periphery is of a like breadth, and of a like converse pattern, to
that of a mount or other object to be ground, polished, or operated upon, as described
and set forth in figure 8.
Fourthly. Making the counterpart shaped peripheries, of bobs herein described,
embrace and collectively operate upon, two or more of the annular patterns, of a series
of patterns, of a mount, or other object, to be ground or polished, substantially as
described.
Fifthly. Carrying, mounting and bringing bobs up to their work, by swinging or
hanger frames e, e³, e³, as described and illustrated.
Sixthly. The combination of a fixed bob, and a movable bob, the latter of which is
mounted and carried at the lower extremity, of a hanger frame as described.
Seventhly. Bringing bobs which are carried by swinging frames, or by sliding
devices, up to their work, by means of the gravitating effect of a weight, (or spring)
through the intervention of a cord, passing over pulleys or their equivalents,
substantially as described and set forth.
Eighthly. Supporting a mount or other article, while being bobbed, by a rest bob,
whose periphery is of the converse pattern, to that of the article supported, substantially
as described and illustrated.
Ninthly. The combination of two polishing bobs, and a rest bob, and between which
three said bobs, a mount or other article is operated upon, with or without, a
supporting chuck or mandril, substantially as described and set forth.
Tenthly. Bringing together two or more bobs, of the kind herein described, (with
or without a supporting bob,) by slides, working within slide rests, substantially as
described.
Eleventhly. Opening out, or relieving bobs from their work, by a cam h, h³, which
act upon rollers, carried by, or connected with, the bob carriers, as described and set
forth.
Twelfthly. Holding the mounts or other articles while being operated upon, by an
expander chuck, which is constructed and operated by means and appliances as herein
described and illustrated.

page_text: Thirteenthly. Adjusting, regulating, and affixing rest bobs, by rack and pinion
gearing, lever, and quadrant-slotted plate, as described and set forth.
Fourteenthly. Operating the rod o, which expands and releases the chuck, by a
helical slot n³, and pin nt, whereby a to and fro movement is given to the said rod, on
the rotation of an axis n, by a handle or other means, substantially as described and
set forth.
Fifteenthly. Carrying the work axis, chuck and other auxiliary parts connected
with it, by a frame m, which is constructed, arranged, and working substantially as
described and set forth.
Sixteenthly. The improvements in the gear and means, for communicating motion
'from the driving axis, to the work axis, as described and set forth.
Seventeenthly. Automatically taking the work axis out of position, by a bar e³,
(carried by, one of the bob hanging frames, or its equivalent) coming against an
upright arm m³, substantially as described and set forth.
Eighteenthly. Excluding dirt from the bearings of the bobs, by hooded collars c³,
as described and set forth.
Nineteenthly. The improvements in machinery and appliances, for the grinding,
polishing, and finishing of metallic mounts, caps, casings and other similar articles, as
herein described; and which said machinery, appliances, gear and driving mechanism,
and parts thereof, are constructed, arranged, combined, and operate, and work
substantially as described and set forth.
Twentiethly. The improvements in the construction of hanging bob-carrying frames,
as herein described and set forth in the modification figure 9, of which the lower part,
is made to swivel upon, the upper part, substantially as, and for the purpose as
described and set forth.
Twenty-first. The improvements in the mounting of bob hanging or hanger frames,
as described and set forth in figures 10 and 11, whereby the bobs carried by the said
frames, are made to follow any irregularities in the work.
Twenty-second. Making bobs approach or recede from each other, in order to bring
them up to, or take them from the work, by means constructed, arranged, and working
substantially in the manner, as herein described and set forth in figures 12 and 13 of
the accompanying drawings.