close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2134751

код для вставки
Nav» l, 1938.ì
`
E. DUNFORD
2,134,751
` EDGE TRIMMER GRINDER
Filed Sept. 9, 1937
8/6
`
[/71/6/7/0/
i ` @mas/L @aß/9M’
Patented Nov. 1, 1938
2,134,751
LUNITED STATES PATENT OFFICE
2,134,751
EDGE TRIMMER GRINDER
Ernest Dnnford, St. Louis, Mo., assigner to Lan
dis Machine Company, St. Louis, Mo., a corpo
ration of Missouri
Application September 9, 1937, Serial No. 162,967
11 Claims. (o1. slums)
This invention relates to the art of grinding hand end of stud Ill forms a pivot I2 for a cutter
:rotary cutters of which one example is the cutter
`used for trimming `the edges of shoe soles and
`having a series of deeply recessed and peculiarly
K5 shaped teeth. It is to be understood that the use
ofthe invention is not limited to cutters of this
speciñc class but such a cutter and the grinding
wheel .therefor and elements of the mounting
`for the cutter are illustrated in the associated
i10 drawing.
The .lmainobject of the invention is to facilitate
the application of a cutter tooth to the grinding
wheel and `a quick removal of the cutter from the
grinding wheel and the ready rotation of the cut
15 :ter on ‘its ,mounting to present another tooth to
the‘wheel.
'
Another :object of the invention is to insure
the accurate spacing of the ground surfaces of
successive teeth irrespective of the skill of the
`20 operator `and irrespective of the number of times
that the cutter ‘has been ground or the extent
to which the original cutting surfaces have been
Worn-down.
`Another object of the invention is to readily
25 accommodate diiîerent diameters of cutters and
ïvariations «in the thickness and diameter of the
grinding wheel.
These general objectives and other more de-tailed objectives as will be apparent from this
30 speciñcation, are attained by the structure illus
trated in the accompanying drawing, in which:
Figure :1;is, in part, a front elevation 0I" the end
portion `only oi a shoe trimmer with a cutter
grinding vwheel andcutter mounting ñXture ap
35 plied thereto, the portion oi the fixture being sec
tioned >to »more clearly illustrate its construction;
Figure 2 is an end elevation of the structure
shown in Figure 1; and
.'Figure 3 is a top view of so much of `the struc
40 ture `as .necessary to illustrate certain features
described.
Figure‘l -is a similar view showing- the parts in
another -position.
The end oi the trimmer frame, indicated at i,
45 journals‘a Vrotating shaft 2, projecting beyond the
frame and carrying a grinding wheel 3. 'I'he cut
ter to rbe `sharpened on the wheel kis indicated at
4 and is‘of `a :familiar contour, embodying a series
of radial yteeth 5, with their cutting edges ii facing
50 circumferentially of the wheel.
The iixture which mounts the cutter comprises
a bracket 1, the base‘ö of which ñts against the
end of the «trimmer frame i vand is secured in
place by screws 9. vA stud I il has its left hand end
55 threaded-into albossisi on bracket land the right
support arm I3, which can'oscillate about the stud
axis. A handle I9 Von arm I3 facilitates the piv
otal movement of arm I3 about stud Ill.
A knurle'd sleeve I5 secured to stud Il) enables «35
the user to rotate the stud and thereby shift pivot
I2 towards and away from the bracket base or
transversely of the plane of the grinding wheel 3.
Screw I ii, threaded through boss II may be tight
ened to engage stud I il and hold it against the 110
movement just described.
A cap I4 attached to the end of pivot I2 retains
support arm t3. A spring >26 compressed between
a shoulder on stud I() and arm I3 thrusts the
latter to the right. There is a slight clearance in- ¿15
dicated at C (Figure 1l) between arm I3 and the
edge of sleeve I5, permitting a slight movement
of arm i3 to the left for the purpose ’hereinafter
mentioned.
_
`The upper end of arm `>I3 terminates in a verti- 20
cally disposed spindle I 1, journalling cutter 4,
there being a flange `I8 at the base of the spindle
for supporting `the cutter.
An upstanding ñnger 22 is pivoted on arm I3
and a coil spring 23 tends to move finger 22 to- 25
ward the common axis of spindle I1 and cutter 4.
During Vsuch movement the upper end of ñnger 22
enters the space between two successive teeth‘â
(Figure 3). The right hand face œ of finger 22
is disposed at such an angle Ithat it substantially 30
coincides with the `engaged cutting face of the
tooth 5u. The opposite face y oi 1’inger22 is
beveled or rounded so that as the ñnger moves
inwardly toward the cutter axis it engages tooth
¿ib and holds the cutter against play about its 35
spindle, irrespective of variations in the space
between teeth 5a and 5h as may result from re
peated grinding.
A lug 2t on ñnger 22 is positioned to strike a
pin 2i on bracket 1 to arrest the movement of arm 40
i3 away from the grinding wheel (Figure 4), but
after elements 23 and 2l are engaged, heavier
pressure on handle I9 will stretch spring 23 and
the arm may be moved farther away from the
wheel, ñnger 22 remaining stationary, clearing 45
the cutter so that the latter may be rotated on
spindle Il to present a new tooth to the finger
and to the wheel. y Movement of the arm inwardly
towards the grinding wheel is positively limited
by the engagement «of `a lug 24 with a stop screw 50
25 adjustably mounted in a lug 2'! on the lower
portion of the bracket. (Figure 2).
With the parts in position as indicated in Fig
ure 1, the tooth face opposing the grinding wheel
willbe spaced slightly‘therefrom but upon manual 55
2,134,751
2
movement of arm I3 to the left to the extent pro
vided by clearance C, the tooth face will be
brought against the wheel, as indicated in Figure
3. When the surface of the tooth has been
part and limiting its movement with said support,
said support being movable with said cutter after
ground to the extent permitted by the contact of
finger 22 with the next tooth, pressure on arm I3
is released, the tooth and wheel separating under
the thrust of spring 26. The operator then ro
tates arm I3 on pivot I2 until the parts are in the
position shown in Figure 4, whereupon the cutter
Wheel may be rotated one tooth and the position
ing and grinding operation repeated.
The construction described results in the uni
form application of successive cutter‘teeth to the
15 grinding wheel, irrespective of the operator’s skill,
for the reason that finger 22 and spring 23 hold
the cutter against movement about the spindle
axis, and stop elements 24 and 25 limit move
ment of the cutter inwardly toward the wheel.
Assuming that the cutter teeth are evenly spaced
in the original article, it will follow that the suc
cessive grindings will be equal on all teeth due to
the positioning of the tooth being ground by
the engagement of iinger 22 with the next tooth
and, assuming that the operator will grind all
of the teeth on the cutter and not remove the
cutter with only a few of the teeth ground. Even
in the event of such an improper grinding opera
tion, if the cutter is again placed on the fixture
30 and the grinding operation performed through
out a complete rotation of the cutter on spindle
I1, the cutting surfaces will be evenly spaced from
each other as in the original cutter. If the cutter
is very dull and the first application of teeth to
35 the wheel does not produce keen edges, the re
peated application will result in further removal
of metal from the tooth face and this cycle may
be repeated.
When the grinding wheel wears down, set screw
40 I6 may be loosened and stud l0 adjusted to the
left to bring the cutter mounting block closer to
the wheel grinding face. With such adjustment,
finger 22 is also moved bodily and the cutting face
of the tooth will be maintained parallel to the
45 grinding face of the wheel.
Obviously, details of the structure may be
changed substantially from those illustrated and
described above without departing from the spirit
of the invention and the exclusive use of such
50 modiñcations as come within the scope of the
claims is contemplated.
I claim:
1. In combination, a grinding wheel, a support
arm pivoted about an axis substantially parallel
55 to and substantially spaced from the axis of said
wheel, said arm having a cutter journalling spin
dle adjacent to said wheel with its axis extending
transversely of said wheel axis, a ñnger pivoted on
said arm about an axis extending transversely of
60 the axis of said spindle, said iinger terminating
adjacent to said spindle and having an element
tapered to enter the recess between two cutter
teeth so that its opposite sides engage a cutter
tooth cutting face and an opposing face of an ad
65 jacent tooth, and a tension spring connecting said
arm and iinger and thrusting said finger inward
ly of said recess, to effect such engagement.
2. In combination, a grinding Wheel, a bracket,
a support movable thereon substantially parallel
to the plane of the grinding surface of said wheel
and including a spindle for journalling a circular
cutter so that it may rotate in a plane trans
versely of said iirst mentioned plane, a part mov
able on said support into position to engage a
75 cutter tooth, a stop on said bracket engaging said
said stop and part engage to free said cutter
from said part.
3. In a device of the class described, a grinding
wheel, a ñxture for mounting a cutter to be ap
plied to said wheel and comprising a fixed bracket,
a stud mounted on'said bracket, and the axes of
said stud and wheel being substantially parallel,
means for securing said stud at various points 10
transversely of the plane of said wheel, an arm
having a cutter journalling spindle and oscillating
on said stud to move said spindle towards and
away from said wheel, and means for engaging -
the cutting face of a cutter to position the cutter 15
and to hold the same positively against rotation
on said spindle during the grinding operation.
4. A device as described in claim 3 in which the
cutter holding means moves with the arm for a
portion of the movement of the latter, the device 20
including stops which then hold said means
against movement with said arm so that said arm
and a cutter thereon may clear said means and
accommodate rotation of said cutter to present
25
another tooth to the grinding wheel.
5. In a grinding fixture of the class described,
an oscillating support for a circular cutter, spaced
devices for limiting the oscillating movement of
said support, a member movable to different po
sitions on said support to engage the cutter or to 30
release the same, said member moving with said
support to hold said cutter to properly present a
tooth to the grinding wheel and said member co
operating with one of said devices to be held
against movement with said support to free the 35
cutter from said member and permit the rota
tion of the cutter on said support to present an
other tooth to said wheel.
6. In combination, a grinding wheel, a station'
ary pivot, a support arm mounted on said pivot,
whereby said arm may swing towards and away
from the axis of said wheel, there being a cutter
journaling spindle on said arm with its axis ex
tending transversely of said wheel axis whereby a
cutter rotated thereon may present successive 45
teeth to the grinding face of said wheel, means
on said arm for holding a cutter against rotation
on said spindle, said arm having sliding move
ment on said pivot to bring a tooth face against
said wheel.
7. A device as described in claim 6 which also
includes means yieldingly thrusting the arm along
its pivot away from the grinding face of the wheel.
8. In combination, a grinding wheel, a station
ary pivot, a support arm mounted on said pivot 55
whereby said arm may swing towards and away
from the axis of said wheel, there being a cutter
journaling spindle on said arm with its axis ex
tending transversely of said wheel axis whereby
a cutter rotated thereon may present successive 60
teeth to the grinding face of said wheel, means
on said arm for engaging a cutter tooth other
than the tooth being ground to hold the cutter
against rotation on said spindle, said arm having
sliding movement on said pivot to bring a tooth 65
face against said wheel.
9. A device as described in claim 8 which also
includes means yieldingly thrusting the arm along
its pivot away from the grinding face of the wheel.
l0. In a device of the class described, a grind 70
ing wheel, a stud with its axis disposed substan
tially parallel to the axis of said grinding wheel,
a portion of said stud comprising a pivot, an arm
mounted on said pivot and adapted to support a
cutter in position to have its teeth presented to 75
2,134,751
, .
3
said wheel, said arm being rotatable on said pivotments and means cooperating to determine the
to move a cutter towards and away from the pe
riphery of said wheel and said arm being slid
able on said pivot to move the face of a cutter
tooth towards and away from the grinding face
of said wheel, there being opposing elements on
said arm and stud limiting the sliding movement
of said arm, there being means on said arm for
holding said cutter in position thereon, said ele
eXtent of grinding which can be eiîected on a
cutter tooth at a single presentation of a tooth to
said grinding wheel.
ll. A device as described in claim 10 which also
includes means yieldingly thrusting the cutter Cà
supporting arm away from the grinding wheel.
ERNEST DUNFORD.
Документ
Категория
Без категории
Просмотров
0
Размер файла
456 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа