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Патент USA US2407558

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Sept. '10, 1946.
Filed May 16, 1945
2 Sheets-Sheet 1
Sept- 10, 1946.
Filed May 16, 1945'
2 Shéets-Sheet 2
~ 2104mm]? f?mszz’r
"w, _a“m,i9?w
Patented Sept. 10,’ 1946
Richard F. Kneisley, Toledo, Ohio, assignor to
Kneisley Electric Company, Toledo, Ohio, a
Application May 16, 1945, Serial No. 594,024 ' '
3 Claims. (CI. 51-50)
Thlsinvention relatesto machines for grinding
[5. A work-piece l-B 0f vtubular form is mounted
on the mandrel 9 with a sufficiently tight ?t to
and truing the surfaces of tubular or cylindrical
frictionally turn therewith. This work-piece,
members, and is particularly adapted and in
tendedfor operation on short tube lengths of
rubber, or other plastic material.
The primary object of the invention is the pro
vision. of a simple and e?icient machine of this
character which will simultaneously operate on
which constitutes a short length of tubing of
soft rubber or plastic'material, is mounted on
and removed from the mandrel 9 at the tail
piece end thereof before engagement of the man
drel between the centers 8.
a plurality of work-pieces to not only grind or
abrade the surfaces thereof, but also to render
them uniform as todiameter and surface con
The several work-pieces I6, when mounted on
the mandrels 9 and held in working position by
the sets of spindle centers 8, are disposed in cir-~
cular series concentric to the axes of ‘the disks
4 in position to be circumferentially engaged-by
Further objects and advantages of. the inven
tion will be apparent from the following detailed
the peripheral surface of an abrading wheel l1,
description of ‘the invention and from the ac 15 that is rotatably mounted within the annular
companying‘drawings illustrating one embodi
space. de?ned, by. the work-pieces, as hereinafter .
ment thereof, in which
described. ‘
. l .
The several spindles 6 are driven in unison by
Fig. 1 is a side elevation of a machine em
bodying theinvention, with the grinding wheel
a chain l8 extending ‘around spindles I19 on the
near the left end of its stroke ; Fig. 2 is a vertical
outer ends of the spindles, and this chain, be
cross-section on the line 2‘—2 in‘Fig; 1; Fig.3
tween two of said sprocket Wheels, extends over
a drive sprocketwheel 20 on a drive shaft 2|.
This shaft is journaled in standards on a bracket
22 which is mounted on the left end portion of
the table I for vertical adjustment to tighten or
slacken the chain l8. In the present instance,
a motor ‘23 for driving the shaft 21 is attached to
the under side of the adjacent end portion of the
table I and has'a suitable belt and pulley driving
is a similar section on the line 3—3 in Fig. 1;
Fig. 4 is a fragmentary sectional detail on the
line 4-4 in Fig. 2, and Fig. 5 is an enlarged
sectional detail on the line 5—-5 in Fig. 2, with
parts in full, and ‘Fig. 6 is a diagram of the
Referring to the drawings, l designates a sub
stantially flat table or frame; supported by
standards 2 and carrying the operating parts of 30
the machine.‘ Fixedly mounted on the top of the
connection 24 with said shaft;
The abrading Wheel ll, which is preferably of
table 1 near one end on standards 3 is a pair
a nature to grind and reduce the surfaces of
of, axially spaced. disks 4 held apart and braced
by a plurality of tie-rods 5, eight in the present
the member l6 so as to render them of uniform
instance, which are equidistantly spaced in con
centric .relation around the aXis of the disks.
- from and driven by the rotor member of a motor
Carried by the disks 4, with one midway between
each pair of adjacent rods 5, is a set of work
carrying spindles 6 and ‘I, the former being the
live spindle and the other the dead spindle.
These spindles are provided at their adjacent
ends with conical centers 8 for engaging the re
spective ends of .a work-carrying mandrel 9 for
concentric turning therewith. ‘ Theldead or tail
diameter, is mounted on a'shaft 25 projecting
25, and disposed centrally of the set of mandrels
9. This shaft extends beyond the abrading
wheel ll and is mounted at each side of such
wheel in bearings 21 within tubular housing sec
tions 28, the inner one of which relative to‘ the
motor 26 is ?xedly attached to the motor hous
ing. These housing sections project through
center bearing openings 29 in the disks 4 and the
outer one is prevented from turning with the
spindle 1 -is adapted tolhave limited axial move
ments in a sleeve I ?carried by the respective
disk 4 and is held in yielding center engagement
with the mandrel by theaction of a coiled ex
shaft by a feather 30 thereon engaging ,a recess
held in adjusted positionithereon by. a set-screw.
ards 3B ‘rising from the table I ‘and held thereby
in the opening wall of the respective disk.
The motor 26 is mounted on a carriage 32 for
axial movements toward and away from the ad
jacent disk 4. This carriage is mounted on a
pansion spring H. The live spindle is provided
with a, radially projectingpin l2 >wich engages 50 track 33 supported by the table I. A feed-screw
34 ?xedly projects from the outer or right hand
an ‘L ?nger i3 projecting from the adjacent end
end of the housing» oi‘the motor 26 through the
of the mandrel 9 and causing the mandrel to
hub of a pulley 35 in threaded engagement there
turn with the spindle. . The finger 13, in the
with. This pulley is suitably mounted in stand
present instance, is carried by a collar l4 that is
against axial movements so that rotation of the
pulley will impart axial movement to the motor
26 through the medium of the feed-screw 34. It
is apparent that such movement of the motor 26
will shift the shaft 25 and the housing sections
28 with respect to the disks 4 so that'the abrading
wheel is. caused to have axial movements in par
movement until the opposite limit switch has
been engaged and opened to effect an opening of
the motor control switch 53 and a stopping of
the travel of the grinding wheel at the opposite
end of its stroke, removal of the ground work
pieces and substitution of others on the mandrels
may again be repeated.
allel relation to=the=axes of ‘th‘e‘work-carrying
' I wish it understoodithatgmy invention is not
mandrel 9. The pulley 35 is driven from a motor
limited to any speci?c construction, arrangement
49 suspended from the bottom of the right end. 10 or form of the parts, as it is capable of numerous
modi?cations and changes without departing
portion of the table I, such driving being through
from the spiritof the claims.
a pulley and belt connection 4! toza'count'ershaft“
Having thus described my invention, what I
42, and thence from a pulley on said shaft and
claim‘ras'new; and desire to secure by United
belt 43 to the feed-screw pulleyiii?r' The;motor
States~Letters~ Patent, is:
49 is of the reverse type so as to drive the‘feed
screw 34 in either direction as desired, and ‘is
1. In a'machine'of the class described, a man
controlled by a reversing switchll?iofTwhichAB
is the control handle.
When the carriage 32 is at the limitpf‘its"
to hold an axially elongated cylindrical work
drel mountedrfonrotary movements and adapted
piece,‘ means including an electric motor for ro
movement to the left, anarm 4‘! thereon engages 20 tating said mandrel and work-piece, a carriage
mounted for reciprocatory movements-in-aaplane
the control button of-‘a- normally closed: limit:
switch‘48"andiop‘ens the motor control‘circ-uit,
and‘iwh'en at the limit of its'travel' tozthe‘rigiht;
an arm'41' thereon engages the control'button of‘
a‘ normallyfclosed limit switch lwand a'gain'opens"
said" motor' control circuit. Since: th'e'operation‘
of'the travel motor 40 is‘ controlled by“ limiti
parallel. to the‘.: axis r of ' rotation: of‘the' mandrel,
anr‘electric'motor mounted'on said‘carriage for‘
movement therewith;'a grinding wheel driven’ by"
. said last motor for‘peripheral’engagement with
a side'of "the work-piece carried 'by ‘the mandrel
and for ‘movement with the motor to causethe
switches, normally open- shunting ‘switches . 505 and
wheel to‘ traverse from one end to the other of‘
51: are provided‘ in parallel'with'the' respective
the work-piece; feed means including an electric‘
switches 48 and '49"to'loe.'selectively closed during 30 reversing‘ motorv for imparting predetermined
starting? of ‘ the: travel motor ‘ to 1 return it' in ' the:
movement to said‘ wheel, ?rst'motor"and 'car
opposite direction. Thus, to accomplish" itstre
riage lengthwise of a work-piece, said‘ electric
turn‘; the 1 control arm: 4'6 fof ’ the reversing switch
motors being connected in a common electric cir
45'3is1th'r‘own inl th'eioppo'site‘ ‘direction 'aft'eriwhich'
cuit, a normally open main‘switch in said circuit,‘
the‘ respective *sh'unt switch, 50 or 51', is'normally 35 a control circuit including’ means ‘magnetically
held? closed until ‘ the" carriage‘ has started: and:
operable to maintain said switch closed when
moved su?iciently in the opposite direction: to
said control circuit is closed; aicontroll’switch and
effe'ct'irelease of! the limit switch','when.the:.shunt
two ‘normally closed limitswitchesin-said control
' in'g switch maybe released.v Itisgpparent'that.
circuit, means‘ movable with said carriage'ifor
the carriage 32vand grinding wheel I’! come :to' 40 opening one or' the other of said limit switches
rest" at each‘ end‘of their‘ strokes and remaintat
rest until the reversing switch 45 'has'b'een thrown‘
and‘ the respective shunt'switc'h' 50?,‘ 5]; closed.‘
In the wiring diagram shown in'Fi’g;i6,:arthree
wire~main line‘ circuit having wires 11, b, and c;
is employed, and leads d, e; and f'extend-fromv
these-totheseveral motors '23, iii-and‘ 46; A
main- control'switch- 53, common to all'th'e~motors, is disposed in these‘ leads and'the'reve'rse
switch 45 is disposed‘ in two/of’ the branch leads‘ ,,
tov the travel motor 40. The‘motor‘switch' 53“is
of the-normally open electro-magnettype, with:
its ‘solenoid coil “disposed in thecontrolcircuit.
g'i'n‘rwh'ic'h ‘the two limit switches 48I-an'd 49 are:
disposed- so that- when either‘ of said limit‘
switches,- or a-control switch: 55, in thecircuitg,
is "ope'n'the coil is deenerg'ized' so that th'e'motor,
contro1iswitch>53 isopen and the motors are at‘
Inth'e operation of the'm‘achine, the grinding
of'the work-piecesoccurs during axial travel of.
the-grinding‘ wheelin?on'e direction or the other‘
and-when the wheel‘ travel isiat‘rest'at’e'ach end‘
ofv its ‘stroke, the mandrels are‘ removed. with the3
groundwork-pieces thereon‘ to‘permi't removal of
such pieces zfrom~ the mandrels. When this’has
been done and‘ other'work-lpieces placed on the
mandrels, the latter are replaced in connection
with-thespindles 8i and the button of the shunt
switcliB?', 5|, associated with the limit switch‘ 70
that‘is'th'en open, is pressed tov closethe motor
control" circuit g and to retain it closed until the
carriage 32' is'mo-ved sufficiently in its reverse‘
direction-to release the'eng‘aged: limit switch but
The carriage then‘ continues its travel
when the carriage'is at one or-theotherend'of’
its intended-reciprocatory'movement, a normally
open shunt switch in said control circuit in asso
ciation with each limit switch and operable? to
close the‘ control circuit- during» an open period‘
ofltheassociated'limit switch, and a manually
operable reversing switch in circuit with said re-_
versing motor.
2. In'a'machine of ‘the'class- described, a'plu?
ra'lity of mandrels eachforrholding atubular,
work-piece, means for-releasably holding said.‘
mandrels’ in circular series with their-axes. par
allelandfor rotating-each mandrel about'its -axis,.
an- abrading wheel mounted within the series of
mandrels concentric "thereto ' for- peripheral trim-V
mingengagement withya'work-piece carried by
each mandrel, anrelectric motor. operable to ro
tatablydrive- said wheel, a" feed means'operable
to impart axial movements to said wheel to move.
it'lengthwise of‘the work-pieces, a second motor.
for drivingjsaid feed means, an electriccircuit
including, said'motors; a normally open electro
magnet switch for closing said motor circuit, and‘
an electric 'controlycircuit operable when closed
to e?e'ct a closing of said ‘switch and‘ including,
a normally, closed limitiswit'ch that. is automati
cally operable to open said control circuit at. a,
predeterminedpoint in an axial movement ofsaid
wheel and. its driving motor.
3. In a machine of’ the class, described, a man-‘
drel'ifor holding‘and rotating a cylindrical work-j
piece, means includingan electric motor for driv
ingj said. mandrel, a grinding wheel 'rnounted" for
axialreciprocatory travel and ‘to have peripheral;
grinding coaction'with‘ the surface of ‘the work
piece during such travel, an electric drive motor
for said wheel axially movable therewith, means
including an electric reverse motor for imparting
axial reciprocatory movements to said wheel and
its driving motor, an electric circuit common to
all of said motors, a normally open magnetic
switch in said circuit, a control circuit for said
switch operable ‘when closed to maintain said
' 6
tor, two normally open limit switches and a con
trol switch in said control circuit, means movable
with said wheel and its motor during axial travel
thereof to engage and open one or the other of
said limit switches at the end of each stroke of
said wheel and its motor, and means associated
_ with each limit switch and manually operable
to close‘the control circuit during an opening
switch in closed position, a manually controlled
thereof by the associated limit switch.
reversing switch in circuit with said reverse mo- 1*)
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