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Патент USA US2412397

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Dec.
1o, 1946. '
2,412,397
l.. E. HARPER
FLEXIBLE TUBE PUMP
Filed Deo. 51, 1943
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.$19. .3.>
2 Sheets-Sheet l
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lNvEm-on
LYNoua E. HARPER
BY
`
ATTORNEY
De¢~ 10,1946-
L. E. HARPER
FLEXIBLE
l
TUBE
2,412,397 ì
PUMP
Filed Decfsl, 1943
`
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. 2 Sheets-sheet 2
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. xNvENToR
LYNDUS E. lHARPER
“WW/ECL, A
ATTORNEY '
Patented Dee...1o,_,194e
l24,412,397
x
UNITED 'STATES' _l PATENT, OFFICE _
nauwer, um
' city. M0.
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Appußßußll member 31, 1943, SOIN N0. 516,399 l
` 1e claims.
I
(ci. 10s-14s)
2
1
My invention relates to pumps, and more par
ticularly to a-iiexible tube pump.
. _
It is a purpose of my'invention to provide a
pump that- comprises a flexible> walled Dump
chamber, with which is associated a flexible
walled inlet valve and a flexible walled
outlet valve, and means for ‘compressing
which the flexible tubular member having the
resilient walls is conilned, and to make the pas
sage of such cross sectional size andshape that
the same will accommodate the tube -when it is
squeezed ,or distorted -out of the substantially
circular cross sectional contour. '
- ~
It is another purpose of my invention to pro
vide a pump of the above mentioned character
, or squeezing the walls of said valves and said
pump chamber to obtain a movement of fluid
from an inlet connection to a discharge connec
10 quantity of fluid in“ a given period of time that
tion. Preferably, said flexible walled valve means
and pump'chamber are all incorporated in a sin
being accomplished by either varying the speed
-81e ilexible walled tubular member. Said ilexi-ble
walled tubular member is made of resilient mate
rial, such as rubber, or the synthetic equivalent
viding means for limiting the movement of the
follower or tube compressing member that varies
. thereof, or any similar tubular member that will
have the quality of a thick walled rubber tube of
returning to its original contour after havin
,
been deformed.
-
'
that can be adjusted so as to pump any desired
it maybe desired to pump therethrough, this
of -rotation of the cam or drive shaft, or by pro
the capacity of the pumping chamber.
v
An important feature of the `invention is that
it can be used to introducematerial to the suction side of a larger pump and material will'not _
now through the pump forming the subject mat
It is a particular Purpose of my invention to
ter of this invention, due to the suction created
provide a device of the above mentioned char
Aby the larger pump. Similarly, the pump can be
acter, in which the means for squeezing or com--À
used to introduce materials into 'any line in which
pressing the tubular member to seal on portions
there is a partial vacuum or suction and at. no
thereof to provide inlet -and outlet valve means
and for varying the capacity of a portion thereof 25 time willthere be any more material pass through
the pump forming the subject matter of this in-` to produce a pumping action, has a simple com
vention than the same is intended to pump in
pressingl action on the tubular member by a move
accordance with- the adjustment thereof. The
ment transversely of the length thereof, without
pump can be operated either at a very slow rate
any longitudinal component'to such movement,
to thus overcome objections to pumping devices 30 or at a high rate of speed, as may be> found- de
sirable, and can b'e made with the tubular mem
which have been previously provided, that utilize
ber of very small» bore and also of large bore so
ñexible tubular members to obtain a pumping
that pumps of either small or large capacity, or
action, in which means for squeezing the walls
‘ in face of any capacity, can be built in accord
of the tube together have a movement lengthwise
of the tubular member, always in the same di 35 ance with my invention.
My pump is particularly adapted for supplying
small quantities of fluid material, such as liquid,
ber to be stretched and the material thereof to
to larger bodies of liquid, and can be utilized, for
flow in the direction of movement of said squeez
example, for introducing'small quantities of water`
ing means, thus causing said material to bunch
up at a certain point, and reducing the thickness 40 purifying or similar material into a larger supply
of water in the exact proportion desired, by pro
of the wall ‘of the tubular member at all other
viding a water meter in the pipe through which
points to thus shorten the life thereof.
flows the water to which the treating or dosing
The above referred to purpose of my invention
material is to be supplied, and driving my im
l is accomplished, preferably, by means of fol
lowers, which cooperate with ca_m means to move 45 proved pump directly from the drive shaft of`
the water meter to thus maintain the proportion
in a direction transversely of the length of or
of purifying material to the quantity of Water
’substantially transversely of the length of the
passing through the meter in accordance with _
tubular member to bring about the pumping ac
rection, which tends to cause the tubular mem
tion through operation ofthe valve means and
the adjustment of the pump.
the pumping means thus provided. Said cam 50 . Other objects and advantages lof my invention
will appear as the description of the drawings
means may constitute a cam for each of said fol
lowers or a single cam for all of the followers.
It is a purpose of my invention to provide a
pump of the above mentioned character having a
body portion that has a passage therein, within
proceeds. I desire vto have it understood, how
ever, that I do not intend to limit -myself to the
particular details shown or described, except as
defined in the claims.
2,412,397
3
In the drawings:
' '
’Y
Fig. 1 is a- transverse sectional view through „A
my improved pump, the drive shaft being -brolien
described below. The body portions 8 andl 9 f
' may be made of any suitable material, such as
metal or plastic material, and if made of plastic
material may be molded with the proper’ pas
away.
Fig. 2 is a section taken on the line 2-2 of 5 sages therein for accommodating the tubular
Fig. 1.
member II,- the shaft 22, the cams- on the shaft
Fig. 3 is a section taken on the line
Fig. 1.
22 and the followers.
vThe shaft 22 is provided with a cam 30, which l
of
` Fig. 4 is a section taken on the line 4--4 of
Fig. '1.
«
engages a follower 3|, a cam 32 'that engages a
10 follower 33, and a cam 34 that engages a follower
I
Fig. 5 is a top plan view of a modified form of
35. The body of the pump made up of the por
pump, the cover plate being removed.
Fig. 6 is a transverse sectional view of the pump
shown in Fig. 5, the section being taken on'a plane
lcorresponding to the line 6-6 of Fig. 5, but the 15
cover plate being shown in position, and
Fig. 7 is a fragmentary sectionalview taken on
the line l-~-~`| of Fig. 5, but showing the cover
l
tions 8 and 3 is provided with suitable recesses,
therein to accommodate the cams 30, 32 and 34,
these recesses being designated by the numerals
36, _31 and 38, respectively.Y 'I‘he cam 30 is pro
vided with a high portion 33, the cam 32 with
a high portion 40 and the cam 34 with aA high
portion 4|.
'
»
plate in place.
A
When the high portion of the cam 39 is in en
- Referring in detail to the drawings, in the 20 gagement with the follower 3| the tubular mem
form of the invention shown in Figs. 1 to` 4, in
clusive, the pump comprises a body portion "I,
which is shown as being made of two similar
halves 8 and 9, which are secured together in
ber Il is compressed between the end 42 of said
follower 3|- in engagement therewith- and the wall
of the passage so that the same will be squeezed
or distorted‘to seal the passage 43 normally ex
any desired manner so as to be held inl relatively 25 isting in said tubular member II, the passage
fixed position. The two halves >of said body por
tion are provided with channels or grooves there
in to form a passage I0 therethrough, which is
somewhat deeper than it is wide, vas shown in the
drawings, the width of the passage I0 being sub
stantially that of a flexible 'tubular member II,
which is, preferably, made of resilient material,
being closed then, as indicated at 43' in Fig. 2.
The portion of the tubular member engaged by
' the follower 3| in cooperation with said follower
3| and the cam 30 constitutes inlet valve means
for -the pump and in the- lposition of the parts
shown, the suction or inlet stroke of the p_ump
>has been completed and the discharge stroke of
such as rubber, or a synthetic material of a
the pump is about to begin. The high portion
similar character to rubber, vor any similar ina-,
39 of the cam 30 is so` related to the high portion
terial that has suiïicient elasticity to return to 35 40 of the cam 32 and these high portions are
its original shape after having been distortedof such relative arcuate length that the move-,
out of such shape by applying pressure thereto. ment of the follower 33, which compresses the
'The channel -I0 is, preferably, provided with an
reciprocable pumping member toward the wall
annular'groove I2 and an annular groove I3 in
of the passage I 0 opposite the end 40 of said
the wall thereof, in which the annular ribs I4 40 follower in engagement with said tubular mem- ;
and I5 of the inlet connection I6 and outlet con
ber ||,-does not commence until the follower 3|
nection Il, respectively, are mounted. The inlet
has reached the position shown in Fig.A 2. ‘
connection and outlet connection have reduced
Similarly, the high portion 4| of the cam- 34
Aend portions I8 and I3, respectively, received
is of such arcuate length relative to the high
within the tubular member II, and to which the 45 portion 39 of the cam 30 and the high portion 40
tubular member II is clamped bythe cooperat
of the cam 32, that the follower 35 will be in
ing halves 8 and 9 of the body portion, which
engagement with the low portion of the cam 34
have the channels therein so shaped as to pro
at the time that the' movement of the follower
' vide a substantially cylindrical or circular por-`
33 in a direction to compress the tubular mem
tion at 20 and 2| of such diameter as to clamp 50 ber` | I begins, said follower 35in cooperation with
the' end portions of the tubular member II be
the portion of the tubular member |I engaged
tween the reduced ends YI8 and I3 of the inlet
thereby constituting the discharge or outlet valve
and outlet connections and the wall portions 20
of the pump, which will' then be wide open to
and 2| to provide a liquid tight ñt between said
permit discharge of the ñuid in the pump cham'
inlet and outlet connections'and said tubular 55 ber formed by the portion of the tubular `memmember |I. The main portionv of the channel ` ber || opposite the follower 33 to pass out
-from the inner end of the inlet connection to
_ through the same into the discharge or4 outlet
the inner end of the outlet connection is, how
connection I1. Said high portion 4| of the cam
ever, preferably rectangular or oblong in cross
34 is further of such arcuate length and so dis
section, as will be obvious from Figs. 3 and 4.
60 posed relative to the high portion 40 of the cam
. Said body portion made up of the members 8
32 that the same will move the4 follower 35 so
and 9 is also provided with suitable channels
_as to compress the tubular member || between
to provide a passage for the drive shaft or cam
the end 45 thereof engaging said tubular mem
i
shaft 22,v and recesses for accommodating the
ber II and the wall of the passage I0 Opposite
'cams provided on said shaft. Said portions 8 65 thereto, to close the passage 43 in the manner
and 9 of the pump body may be provided'with
illustrated in Fig. 2, after the follower 33 hasl
channels therein to provide the bearing portions
completed its movement toward the wall ofthe
23, 24, 25 and 26 for said shaft, or if desired,
passage lll’opposite thereto and while the high
'separate bearings for the shaft can be mounted
-portion 40 of said cam 32 is in engagement with
in recesses, provided in said members to accom- 70 said follower. Further the high portion 39 of the
modate said separate bearings, and secured to
cam 30 is of such arcuate length and so disposed
one thereof.- `The body portion is further pro
that it will pass from engagement with the fol
vided with suitable» channels in the halves 8 and
lower 3| and said follower will be in engagement
9 thereof to provide passages 21, 28 and 23, which
with the low >portion of said cam before said
serve as guides for reciprocable followers -to be ’I5 high portion 40 of the cam 32 leaves the follower
" 2,412,897
.6. thevniain
mmgaaeaiidmn which
33, _the inlet valve thus- opening before the foi
iscr- '
.'tion 56 of the pump is provided with a, bearing
lower 33 begins its return stroke, which consti
tutes -the suction or intake stroke of the pump. Í 5l for the shaft 52, upon which a single cam 53
The inherent resiliency. of the tubular member
is mounted. Said body portion 5ll"_is provided
with a passage 54 therein, having straight por
Il will cause the followers to remain in contactv
with the cam surfaces as the low portions of the
tions 51, 58 and 59 that -are substantially rectan
ï, gular in crossv section and, preferably, of greater
cams come into engagement with said followers.
‘ depth than width, the width thereof being sub
The pumping rate- of said pump can be -deter
stantially .that of thel external‘diameterfofthe
mined by the rate of rotation of the shaft 22
and any suitable means can be provided for con
tubular member 55, which is similar to the tubu- `
trolling the rate of rotation of said shaft. In~
addition to this, or instead of this, means-can '
lar member Il, previously described. Said pas
sage 54 has curved'portions 56v connecting the
be provided for controlling the amount of ma- A
Qstraight passage portion 58 with _the straight
portions 51 and 59. The _curved portions 56 of ~
.said passage are circular in cross section and,
terial pumped per stroke of the pump by suitable
stroke adjusting means to be described below.
preferably, closely i‘itA the tube 55, as shown in
Preferably, said stroke adjusting means com- _
Fig. '1.Y The body portion 56 also has passages '
i 60 vand 6I therein,fwhich. extend substantially.
, transversely to the .straight portions 51 and 58
' prises adjustable stop means for limiting return
movement of the follower 33, as ~in that manner
the stroke of the pump and the quantity of ma
terial pumped on each stroke can be controlled, .-20 of the 'passage 54, which these- intersect, and these
extend substantially radially from the axis of
as obviously if the follower 33 does not return to>
' the position shown in Figs. 1 and 3, the capacity
_ the shaft 52..
A recess 62 is provided in the body portion 56,
of the portion of the passage 43 constituting the
suñiciently large to readily accommodate the cam
Dump chamber of variable capacity bymeans of
said follower 33 will not be at its maximum. While ` 25 53 and the passages 60and 6I extend from said
the follower 33 will compress or squeeze the tu
recess to the passage 54. A wide rectangular re
bular member Il against the wallof the passage
cess 53 -_is connected with the recess 62 by a wide
I0 so as to close the same throughout the length - . passage 64.
The cam has -a single semi-circular ‘
thereof opposite the face 44 of said follower 33,
high portion 65 and a semi-elliptical low> por
'- or distorted to substantially> the shape of said 30 tion 66, said high and low portions being so re- -Ã
tubular memberrsï‘ìownl in Fig. 2, when the limit _
lated to the followers 51, 69 and 68 slidably mount
ment with the high@V portion of the cam is reached, '
63 that said followers will operate »in proper se--_ _
- of the stroke of t e follower 33, due to engage
the amount of material pumped by such action
of the follower will be dependent upon the size
to which the passage 43 is permitted to expand
ed in the passages ' 68 and 6I and in the ' recess
’ -- quen'ce to compress or squeeze the'tubular inem
35 .b'er
55 into engagementv with the wall of the
straight portion 51` _of the passage 54 ’œ close the
when the follower moves away from the wallof ., *inlet valve formed by means of the- follower 61
the passage I8 due to the high portion 40 of the l and the- cooperating portion of the tubular mem
cam leaving the same. While the adjustable t ' ber 55 before the follower 68 begins to compress j
stop means for limiting this return movement, 4o_ or. squeeze the tubular member 55, and lto retract
' and thus the'lcapacity of the pump chamber, may j ' -the follower 59_so as to open the outlet valve
be of any desired character, and _may be pro- _ formed- by said follower and the cooperating por
vided with> any suitable means for indicating the '_ tion of the tubular member 55 before'said squeez
adjustment/thereof, a simple form ~of such stop " ing or compressing action of the follower“ com
means may be such as shown in Fig. 3, in which _ 45 mences, and conversely tol close the outlet valvey
an adjustable stop screw 46 is screw-threadedly - by means of the follower`69 and open the inlet
mounted in the upper member 9 of the body por.
tion 1, the head portion 41 thereof being mount
valve by means ofthe follower` 51 before the re
' turn stroke of the follower 68> commences, due to
- ed in a recess 48 therein.
Rotation of the screw
the high portion 65 of the cam disengaging the '
46 in the proper direction to the desired ‘extent 50 roller 10 on the follower 68.
_
will, of course, place the'end 49` thereof in such
Suitable means is provided for adjusting the
position as to stop the follower 33 by engage
stroke of the follower 68 to any desired length to
ment therewith at the desired point to limit the
pump the desired quantity of fluid material per
stroke thereof to get the desired pumping ca
stroke of said follower. The follower 68 is, pref
paclty.
While the tubular member Il is, preferably,
made of rubber or similarmaterial, any suitable
material that is flexible, which can be readily
distorted so as to seal the passage therethrough
55
erably, provided with a partially cylindrical re-_
cess‘- 1| in which the roller 10 _is seated.
Said
roller ismounted on va depending shaft-like or
pivot portion 12 of a slide.13 mounted for re
ciprocation in a passage. 14 in the cover member-
at the points at which the followers 3| and 35 60 15 ñxed to the body portion 50 to complete the
engage therewith, and which can in a similar '
pump body. Said cover member is also provided
manner be distorted to pump liquid material
with a recess 16 to accommodate the depending
therethrough by means of the follower 33, can
member 12 in its lmovements with the followerbe utilized as long as said material has an in
68. The slide 13 has a depending bracket portion
herent resiliency or elasticity, such that it will 65 11 provided' with a threaded opening for’receiv
tend to return to its normal shape of circular
. ing the adjustable stop screw 18 having a knurled
cross section, or any other desired cross section,
head 19 thereon for adjusting the same. The
in which the passage through the same has its ' screw 18 also has a nut-like locking member 86
maximum capacity, upon the squeezing pressure
thereon having a finger piece thereon for ad
exerted thereon by the followers being relieved. 70 justing _the same. Said screw can be adjusted to
Instead _of providing a pump with a straight
passage through the same for the’tubular mem
ber and a plurality of cams for operating the fol
limit the return movement- of the follower 64,
said screw thus serving as adjustable stop means ’
for the follower. _
lowers toî accomplish the pumping action, my
Any suitable means may be provided for driv
improved pump can be made in the form shown 75 -ing the shaft 52, but, preferably, means is pro
'ana-fsa?
2
»
.
7
a
vided the speed of which isv adjustable. z One of the
increase the‘capacity thereof between said sealing
desirable applications of a pump _of the character
means, means controlling the length of stroke
shown in Fig. 5 is to supply small quantities of
of said reciprocable means, and driven means for
dosing material, such as water purifying material,
operating said sealing meansy and vsaid capacity
to a larger quantity of liquid in proper proportion,
_varying means in relative succession to move a
such as to water for softening or purifying the
ñuid from said inlet conduit to said discharge
same, and in such case it is highly desirable to
conduit through said flexible tubular member.
operate the shaft 52 at speeds in proportion to
3. In a pump of the character described, a
the amount of water that is to bev treated. This i Lbody portion having a continuous passage of
can be readily accomplished by connecting the 10 substantially uniform cross section therein, a.
shaft 52 with the shaftv 8| of a water' meter 82 Y. ñexible tubular member, an inlet conduit leading
` by means of any suitable means, such as the
into one end thereof, a discharge conduit leading
cross bar 83 which is mounted on the shaft 8|
from the other end thereof, means cooperating
to rotate therewith, and has pins- 84 projecting
with the wall of said passage to deform a pre
upwardly therefrom, one of which >enages the 15 determined portion of said tubular member'to ’
arm 85 provided on the shaft 52, when the body
reduce the capacity of said portion thereof, means
portion 50 is placed in position on the meter 82.
at a predetermined station between, said inlet con
The body portion 50 is provided with a flange 86,
duit end of said tubular member and said deform
' which seats on the water meter and is bolted
ing means cooperating with the wall of said pas
' thereto by means of the bolts 81, said body por 20 sage to seal said member at said station, meansv
tion having a slight offset therein at 88 to seat
at a predetermined' station between said other.
in the ledge usually provided for the removable
end of said tubular member and said deforming
top of the water meter.
means cooperating with the wall of said passage '
Screw-threaded openingsV 89 may be provided
to seal said member at said last mentioned station,
in the body portion 50 for fastening said body 25 means for moving‘said deforming means and said
portion to any suitable base or bracket, or other
sealing means toward .and awayfrom said wall
means for mounting the same by means of screw
threaded headed members of any-suitable char
acter. Said pumping means can be made of such
small size that the same can be readily driven by
a water meter proportionate to the rate of rotation
of said meter, and thus proportionate to the rate
at which the »water passes through a conduit or
in relative succession to move a fluid from -said
inlet conduit to said discharge conduit through
said tubular member, and means for limiting the
amplitude of movement of said deforming means.
4. In a pump of the character described, a body
portion having a passage therethrough, a flexible.
tubular member' having an unobstructed vpassage
pipe in which the meter is interposed, without in
therethrough mounted in said passage, an inlet
any manner interfering with the operation of the 35 connection leading into one end of said tubular
water meter. Preferably the tubular member 55
member, a discharge connection leading out of the
passes from the passage 54 out of the pump body
other end thereof, a plurality of followers mounted
through enlarged end portions 90 of said passage,
for reciprocation in said body portion each engag
provided to clamp spiral stiiîening members 9|
ing said tubular member at one `end thereof, a
between said tubular member 55 and the walls 40 shaft, and asingle cam on said shaft* engagingA
thereof to hold said-stiffening members in posi-`
said followers to successively vmove the same into
tion to prevent any kinking of said flexible tubular
engagement with said tubular member to move '
member 55 where it passes from the pump body.
a fluidj'through the same from said inlet con
It will be `noted that in both forms of the inven-nection to said discharge connection.
tion the ends of the followers are provided with
,5. In a pump of the character described, a
rounded contours so as to avoid sharp corners
body portion having a passage therethrough, a
that might cut or sharply bend or crease the
flexible tubular member mounted in ‘said passage, ' an inlet connection leading into »one end of said
What I claim is:
tubular member, a discharge connection leading '
1. In a. pump of the character described, a 50 out of the other end thereof, a plurality of follow
resilient deformable tube to avoid injury thereto.
flexible tubular member, an inlet conduit leading
into one end thereof, a discharge conduit leading
from the other end thereof, reciprocable means
for sealing od a portion of »said tubular member
from said inlet conduit, reciprocable means
spaced therefrom for sealing olf- a portion of said
ltubular member from said discharge conduit,
>reciprocable means engaging said tubular mem
ber to 'alternately decrease and increase the
capacity thereof between said sealing means, 60
driven means for reciprocating said means in rela
tive succession to move a iiuid from said inlet
ers mounted for reciprocation in said body por
tion transversely of saidpassageeach engaging
said tubular member 'to squeeze the same between
said followers and the wall of said passage,
rotatable means engaging said followers tomove
the same into squeezing engagement with said
tubular member, and adjustable means for limit
ing the reciprocating movement of one of said
followers.
k
'
'-
,
6. In a pump ofthe character described, abody
portion having a continuous passage of substan
~tially
uniform_ cross section therethrough, a
conduit to Said discharge conduit through said
flexible tubular member mounted in said passage,
ñexible tubular member, and means for adjusting
`the amplitude of movement of said reciprocable. 65 an inlet connection 'leading into one end of said
tubular member, a discharge connection leading
capacity varying means.
out of the other end thereof, an inlet valve com
2. In a pump of the character described, a'
prising a blunt ended follower mounted forre
flexible tubular member, an inlet conduit leading
ciprocation in «said body portion transversely of ì
into one end thereof, a discharge conduit leading
from the lother end thereof, means for sealingV 70 said passage to engage the blunt end thereof
with said tubular member, an outlet valve com
off a portion of said .tubular member from said
_prising a blunt ended follower mounted for re
inlet conduit, means spaced therefrom for ‘sealing
`ciprocation in said body portion transversely of
oiï a portion of said tubular member from said
-discharge conduit, reciprocable means engaging» `saidpassage to engage the blunt end thereof with
said‘tubular member in spaced relation to said _
said tubular member to alternately decrease and
2,412,397
9
.
lo
.
inlet valve follower, a wide, fiat faced reciprocable
mal cross sectional shape having an unobstructed
vmember mounted to engage said tubular member
between said followers to vary the capacity of the
portion of said tubular member engaged thereby,
and means for reciprocating said followers to/
squeeze said tubular member between the same
therethrough, inlet valve means and outlet valve
means engaging said tubular member at spaced
passagev of a defined normal cross sectional area
points to control flow of fluid therethrough, a _re- '
ciprocable member engaging said ltubular mem
and wall portions of said passage to seal said ’
ber between said inlet valve means and said out- - '
tubular member and said reciprocable member
‘let valve means to alternately decrease and in
to alternately decrease and increase the capacity
. crease the capacity of the 'portion thereof between
10
of said portion of said tubular member in such
said valve means, driven means for operating
order as to pump a iiuid through said tubular
said valve means and said member in such rela
member from saidinlet connection to. said dis
tive succession that duid enters said portion of
charge connection.
said tubular member through said inlet valve
'7. In apump of the character described, a
means and is discharged through lsaid outlet
body portion _having a passage therein, a flex 15 valve means, and means for adjusting the stroke
ible tubular memberl mounted in said passage,
of said reciprocable member.
an inlet at one end thereof, an outlet at the
11. In a Dump of the character described, a`
otherend thereof, reciprocable means for sealing
body portion having a continuous passage of sub
off a portion of said tubular member from` said
- stantially uniform cross section therethrough
inlet, reciprocable means spaced therefrom for 20 free of obstructions therein, a flexible tubular
sealing off a portion of said tubular member from
member mounted in said passage, said tubular
said outlet, reciprocable means engaging- said
member having the inherent tendency to re
tubular member to alternately decrease and in
crease the- capacity thereof between said seal
ing means, and -driven means for reciprocat
sume its normal cross sectional shape upon dis-- '
tortion thereof, a plurality of followers mounted -.
25 `for`reciprocation in said body portion each en
ing said means in relativeysuccession to move a
gaging said tubular member at one end thereof
to squeeze the same solely between itself and a
fluid from said inlet to said outlet through said
ñexible tubular member, said tubular member
wall portion of said passage, a shaft, and cam
being normally of substantially circular cross _v
means on said shaft engaging the other ends of
section and said passage being of greater cross 30 said followers to successively positively move the
sectional dimension than the normal diameter
same into squeezing engagement with said -tubu-- ~ `
of said tubular membei~ transversely of the direcÍlar member and to permit movement of said fol- ‘ f
tionl of reciprocation of said means, and of sub
lowers in a return direction due to the tendency s
stantially the cross section of said tubular mem
of said tubular member to return to its normal
ber in the direction of -reciprocation of said 35 shape to move a fluid tnrough the same in a pre f
means.
-
.
determined direction.
.
-
f
» . '.
-
8. In a pump of the character described a ñex
1.2. In a pump of the character described a
-.
ible walled pump chamber, ñexible walled inlet
body portion having a shaft mounted therein, a
.
valve means," ñexible walled discharge valve
single cam Iori said shaft, said body portion hav-` '
means, means for squeezing the ñexible walls 40 ing a continuous passage extending around said Í
thereof in such relative order as to draw fluid
cam in spaced relation thereto and having spaced
end portions, a flexible tubular member mounted
» into said pump through said inlet valve means
and discharge, it through said discharge valve
in said passage with the ends thereof `projecting _
l means, and means for adjusting the stroke of one
from said body portion at the ends of said pas
of said squeezing means to control the quantity 45 sage, and means actuated by said cam recipro
of fluid passing through said pump during one
cable in said body portion and engaging -said
cycle of operation'thereof.
'
tubular member to successively squeeze the walls
9. In a pump of the character described, a
of the same together between said reciprocable
ñexible tubular member of a predetermined nor
means and awall of said passage, said recipro- '
mal cross sectional shape having a uniform pas 50 cable means comprisingr inlet and discharge valve
sage of a deñned normal _cross sectional area
means spaced along said passage and a member
therethrough free of obstructions therein,- a
that alternately decreases and increases the
housing through which said tubular member ex
capacity of said tubular member between said
tends, inlet valve means and outlet valve means> , valve means having a blunt end engaging said
engaging said tubular member at spaced pointsA 55
in said housing to control ñow of fluid there
through, a member reciprocable in said housing
having a blunt end engaging said tubular mem
crease the capacity of the portion thereof `be
in such relative succession that ñuid enters said
portion of said tubular member throughsaid in
let valve meansand is discharged through said
outlet valve means, said means positively mov
ing said reciprocable member in capacity de
‘ creasing direction, vsaid tubular member having
the inherent tendency to return to normal cross
sectional shape _upon deformation thereof to
move said reciprocable member in capacity in
creasing direction.
10. In a pump of the character described, a
flexible tubular member of a predetermined nor
'
,
_
13. In a pump of the-character described a
body portion Vhaving a shaft mounted therein, a'
single cam on said shaft, said body portion hav- ‘
` ber between said inlet valve means and said out- '
let valve means to alternately decrease and in 60
tween said valve means, and driven means for
operating said valve means and said member
tubular member.
ing ‘a continuous passage extending around said
cam in spaced- relation thereto and having spaced
end portions, a flexible tubular member mounted
in said passage with the ends thereof projecting
from said body portion at the ends of said pas
sage, means actuated by said cam reciprocable in
said body portion and engaging said tubular
member to successively squeeze the walls of the
same together between said reciprocable means
and a wall of said passage, said reciprocable
means comprising inlet and' discharge valve
means spaced along said passage and a member
that alternately decreases and increases the ca
pacity of said tubllar member between said valve
means having a blunt end engaging said tubular
member, and means for adiustingthe stroke of
' said capacity varying reciprocable member.
v
' '
anasev
,
l
~
liz
-
..
»
\
»
successively squeeze the 'walls of the _same to
gether between said reciprocable-means and a
14. In a pump of the character described, a
flexible tubular member ofa predetermined nor
mal cross sectional shape having an unobstructed
v wall of. said passage. said reciprocable means
comprising inlet _and -discharge valve meansl
, passa e of a deñned normal luniform cross sec- »
tionalg area> therethrough, a housing through`
which said vtubular member extends, inlet valve
v spaced along said passage and a member that
means and outlet valve‘` means engaging said y
alternately decreases andincreases the capac
ity of said tubular member between said valve _`
tubular member at spaced points in said housing
to control fiow of fluid therethrough, a member
member.
means having an end engaging said tubular
4
reciprocable in said housing having a blunt end
16,-In a pump of the character described a
engaging said tubular member between said in
let valve means and said outlet valve means to
body portion having a passage therethrough hav-'
ing a lcontinuous rigid fixed wall restrainedv
against any movement, a flexible tubular member
mounted in said passage, said tubular member.
alternately decrease and increase the capacity
of the portion thereof between said valve means,
and a single cam for operating said valve means 15 having an unobstructed passage of uniform~ cross
section therein and having an inherent tendency
and said member in such relative succession that
to return to its normal contour upon deflection
iluid enters said portion of said tubular mem
ber through said inlet valve means and is dis . _ » thereof, a plurality of followers «mounted for rec P
rocation in said body portion transversely of s d'
charged through said outlet valve means with
out inñating said portion and without increasing 20 passage each engaging said tubular member ~\to
the crossv sectional area of the passage there- g vsqueeze the same solely between said followers.
and the _ñxed wall of saidÍ passage that is-re
through beyond normal.
strained - from any movement, and rotatable
' means engaging said followers to move the same
15. In a pump of the character described »a
body portion having a_ shaft mounted therein, a
single cam on said shaft, said body portion hav 25 into squeezing engagement with said tubular
ing a continuous passage extending around said ' Amember and release thesame to permit said
tubular member to return the sameunder. the
cam in spaced relation thereto, a flexible tubular
iniluence of its tendency to return to normal.
member mounted in said'. passage, and means
actuated by said cam reciprocable in said body
» portion and engaging said tubular member to
so
_LYNDUS E. HARPER. Y
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