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Патент USA US2077816

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April 20, 1937-
-v F. w. vlcKERY
l
2,077,816
DOCTOR FOR PAPER MAKING AND LIKE MACHINES
Filed Jan. 18, 193e
2 sheéwsheet 1 f
BY ß' ¿QW
April 2o, 1937.
F, W_ VICKERY
,
2,077,816
- DOCTORv FOR PAPER MAKING AND LIKE MACHINES
Filed Jan. >18, 1956
2 SheetÈ-Sheet 2
ATTORNEY.
i Patented Apr. 20, 1937 l
`
2,077,816
vUNITE-D .STATES PATENT “OFFICE
2,077,816
Doc'roaroit PâiÃr‘zgREINES
MAKING AND Lum
Frederick William Vickery, London, England
Application JanuaryY 18, 1936, Serial No. 59,718
In Great Britain January 16, 1935
s claims. " (ci. 92-74)
In modern doctors a flexible blade is held, but
not clamped, at its rear'edg'e in a rigid holder,
so. that the blade is free to conform closely to
the surface of the roll on which it is pressed.
5 There vhas been a possibility in the past of the
doctor being wrongly adjusted to exert too great
a~ pressure on the blade, which has sometimes
sprung out'of the holder under the excess pres
sure. To lobviate this I have proposed in my
10 U. S. Patent No. 1,912,605 to equip the blade with
enlargements ory projections standing out from
its surface, and to receive'these in an undercut '
slot in the holder so that the blade can be freed
from the holdery only by longitudinal movement.
15
The term “blade” as used hereinincludes any
such enlargements or projections whether inte
gral orv not; and as the enlargements are com
moved lengthwise from its normal position to
free them. Instead of a slide moving-lengthwise
a notched rod may be used and be rotated to bring „
its notches into ’register with the blade projec
tions.
'
u
'
These and other embodiments of the invention
are described in’ detail hereinafter, typicalcon
structions being illustrated in the accompanying
drawings.
.
’-
'
n
Figure 1 is a cross section on the line- I-I of 10
Figure 2, and
Figure 2 a part elevation of one construction;
Figures 3 and 4 are cross-sections of another
construction on the line III-_III of Figure 5
showing the blade held and freed respectively,
and
-
Figure 5 is a sectional elevation of this con
`
monly separate the term lamina is used herein struction on the line V--V of Figure 3;
Figure 6 is a cross-section on the line VI-VI
to distinguish the flexible yresilient part of the.
20
of Figure 7, and
I'
20 blade to which the enlargements are attached.
Figure f1 an elevation of a- thirdconstruction;
The present invention aims at the same pur
poseof preventing the blade from being dislodged
under even yan excessive working pressure, and
achieves it by making a part o__f the holder mov-y
25 able from the end, the blade, that is to say the
lamina, or its projections, or the lamina and its
Figure 8 is a cross section,> and
y
l
ì
Figure 9 a part view of the locking slide of a
fourth construction;
'
'
Figures 10 to 12 are cross-sections of construc-l 25
tions in which the retaining means' is released by
projections being normally engaged by the holder. rotation.
so that lateral withdrawal is impossible and be
ing freed by an operator beside the machine re
30 leasing and shifting the movablev part..
d The movable part of the holder may engage
withopenings in the lamina, butpreferably the
,lamina is 'formed or vfitted with. . projections out-5
standing from its surface as described in my
"P5 former speciñcation above mentioned, and, as
also there described, these either alone -or with
the rear> edge of the lamina are received in what
is irri-effect „an undercut or irregular dovetail slot
40
in therli'gidI holder.
,
1
.
Figure 13 is a cross-section on the line XIII
XIII of Figure 14', and
’
l
Figure 14 an'elevation of lyet another construcf
30
' tion.
In Figures 1 and 2 the undercut slotin which
.the rear vedge of the lamina I and its projections'
2 Aare received is formed by the two parts 3, 4 35
of which the rigid holder is built. The part >3
has a. dovetail >sliding connection with` the part
4 as- indicated, and is preventedfrom sliding while
the doctor is in use by a split' pin 5- inserted'
through it and the part 4 near one end. The 40
rSuch, a slot) maybe formed by the putting to , front wall of the part 3 is notched as at 6, thegether of ktwo parts of which the holder'is built, notches corresponding in size and relative spac
and the blademay be freed by'si-mply separating ing with the projections 2". But in the working
- the two parts to afsuflicient extent, the holder position of the part 3 in which it is held by the
split pin, and in which it is shown in Figure 2,vr 45
being so constructed that the requisite separa
a tion may beleiîected from one end of the holderk the notches 6 are ,notopposite the projections
withoutdismantling it, or one of two parts of 2, so that removal 'of the blade is blocked. I_)Vlienl
which the Aslot "is vformed may be notchedto?al
low the passage of the projections of the blade,
ari'dmoved _longitudinally to bring its notches into
;- register with .the projections A¿when the blade` is
' Kantine,` freed. I, Or one wall of aslotted holder> may
bè" `notchedv opposite the blade projections and a
retaining _, slide maybe provided. in the holder
hlch" alsol engages’the projections and must be
the blade needs to be removed for replacement
the split pin 5 is ’drawn >out and the part 3 slid
lengthwise until `notcltiesand projections regis
ter.
50
`
In Figuresß, 4 -and 5 also the slotto receive
the projections of the blade is formed yby the
putting together >of the two parts 7, 8 of which
the holder is built; and the blade is released by 55
2
`ezto‘z'v
simply separating them. For this purpose the", length adjacent its rear edge, a holder receiving
part 'I is formed with slanting surfaces 9 on' /its
1 under side which ride on chamfered pins yIII set
in the part 8. When the doctor is working the
parts are in the relative position shown in Fig
ures 3 and 5, being pressed together by leaf springs
II. By removing the split pin 5 and pushing the
'part 1 endwise the machine attendant can lift
the part 'I as shown in Figure 4 and the blade can
10 then be removed laterally.
The invention may readily be applied to such
_forms of holder as are described in my previously
mentioned patent by notching one wall of the re
taining slot for the escape of the projections, and
15
inserting in the slot a notched slide. In Figures
6 and 7 the slide- I2 is of L-section and in work
ing position blocks the notches I3 in the holder
as seen infFigure 7. But it ycan be freed and
20 shifted until its own notches I 4 register with the
notches I3 and with the projections 2, and the
blade is released.- Y
Or such a slide may be-ñat as shown at I5 in
Figures 8 and 9' and formed with slots IB open
25 ing to the edge of the slide at one end.
Figure 10 shows a form of holder 20 modified
to receive and fit a round rod I1 in which are
notches I8 extending half across it. As in Fig
ure 'I the front wall of the holder 20 is notched at
30 2l opposite the projections 2 and the notches
are normally blocked by the rod I'I.` By turning
the rod through a right angle, its notches Il are
aligned with the notches 2| and the blade is
freed.
35
.
'
‘
In Figure 11 the groove to receive the projec
tions 2, which with the groove which receives the
rear edge ci' the lamina constitutes the retaining
slot, is formed in the top of a _round rod Il, ro
tatably mounted inthe holder I6 in the same way
40 as the rod Il in Figure 10. When the split pin
5 is removed and the rod I9 turned the rear edge
of the lamina is withdrawn from its groove and
the blade more or less ejected from the holder.
Instead of the rod' I 9 a tube may be used,'similarly
45 molmted and having a slot or perforations (which
are to be understood as included by the words
slot or slotted in the sub-joined claims) in its
upper surface to receive the projections 2.
If the blade, instead of being fitted with pro
50 jections, is perforated at intervals near its rear
edge the moving part of the holder may project
the rear part of said blade and slotted to receive
said projections the outer wall of the slot being
notched at intervals to permit passage of said
projections, and a slide positioned in said slot of
the holder and notched at intervals similarly
to the outer wall of the holder, said slide being
removable lengthwise of the holder to bring the
notches therein into register with the notches in y
said outer wall to permit passage of said projec
tions through said notches, and movable to cause
the imperforate portion of said slide to block the
notches in said outer wall and prevent passage
of said projections therethrough.
2.v A doctor for paper-making and like ma
chines comprising a flexible blade having projec
tions from its surface at intervals along its length
adjacent its rear edge, a holder receiving the rear
par't of said blade, and a round rod supported
by and rotatable in said holder and extending 20
to the end of the holder, the forward part of said
holder being notched to receive the projections
on said blade, said rod having a portion for
blocking lateral removal of said projections
through said notches when in one angular po
sition.
y
3. A doctor comprising a flexible blade, a hold
er provided with a longitudinal groove for re
ceiving the rear edge of the blade, said blade
_having retaining portions provided with a sur
face transverse to the side face of said blade
adjacent the rear edge thereof, a member extend
ing longitudinally of the holder mounted in a
portion of said groove and shiftable relatively to
said holder, and blocking means associated with
said member, said blocking means being displace
able, upon shifting said member, from a position
to engage with the transverse surface of said re
taining means and block lateral removal of the
blade from said holder to a position out of en 40
gagement with said retaining means to permit
lateral removal of the blade from the holder. y
4. A doctor .comprising a ilexible blade, a hold
er for receiving the rear edge of said blade, said
blade having a series of projections extending
substantially perpendicularly from one side face
of the blade and adjacent the rear edge thereof,
and a member carried by the holder and shiftable
relative thereto, said member extending longi
tudinally thereof and having portions operable 50
retaining pins through its perforations. For ex- 4 when the shiftable member is in one position for
ample as shown in Figure 12 a rod 22 actuated engaging the forward portions of said series of
to turn like the rods Il and I9 may carry hooks
55 Áor curved pins 23 which enter openings in the
blade on Vvrotation of the rod. 0r as shown in
Figures 13 an'd 14 a slide 24 moving endwise may
lift retaining pins 25 into the blade perforations.
The cam blocks 26 on the slide are preferably
60 made with inverted T-section slots to receive
heads on the pins so that they are positively
withdrawn on movement of the slide in the oppo
site direction.
-
It will, be appreciated that in all of the forms
65 described, the blocking means are shiftably car
ried by the 'holder and are operable when in one
position for blocking removal of the blade and
operable in another position for permitting re
moval of the blade laterally from the holder.
70 The retaining portion of the blade is intended to
refer to the projections or apertures in the blade
which cooperate with the blocking means.
projections .to block lateral removal of the blade
from the holder.
v
.
5. A doctor comprising a flexible blade,- projec
55
tions on the surface of the blade adjacent the
rear edge thereof, a holder provided with a lon
gitudinal slot to receive said projections, and a
member carried by said holder and shiftable rela
tively thereto, said member having portions ex 60
tending in front of said slot to block lateral
removal of said projections from said slot when
-the shiftable member is in one position.
6. A doctor comprising a flexible blade, pro
jections on the surface of the blade adjacent the
rear edge thereof, a holder provided with a lon
gitudinal slot to receive Asaicl projections, and a
blocking member slidably mounted longitudinally
of said holder and having a portion in 'front of
said slot, said portion of the blocking member
having notches adapted to register with the pro
jections on the blade and being displaceable from
1. Aîídoctor comprising a flexible blade ,lia-ving . a position to permit entry _and removal of the pro
-75 projections on its surface at lritervalä 316118 its jections into and from said slotl to a position to
9,017,316
er having a longitudinally extending groove for
receiving the rear edge of the blade, said blade
block entry and removal oi' the projections into
and from said slot.
7.. A doctor comprising a flexible blade, a hold
er for receiving the rear edge of said blade, said
5 blade having a series of projections extending
substantially perpendicularly from one side face
having a plurality of retaining portions along the
length of the blade adjacent the rear edge thereof
provided with surfaces transverse to the side face. f
of the blade, a member extending longitudinally
of the holder mounted in said groove and shift
able relatively» to said holder, and blocking means
in said groove displaceable by said shiftable
member, said blocking means adapted to engage 10
the transverse surfaces of said plurality of re
taining portions. when the shlftable member is
of the blade and adjacent the rear edge thereof,
and a member carried by the holder and rotat
able relative theretoj said member extending
longitudinally thereof and having portions oper
able when the rotatable member is in one posi
tion for engaging Athe forwardportions of said
series of projections to block lateral removal of
the blade from the holder.
8. A doctor comprising a flexible blade, a hold
3
in one position, to block lateral removal of the l
'
blade.
FREDERICK WILLIAM VICKERY.
15
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