close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2275202

код для вставки
March 3, 1942.
2,275,202
W. P. V. ROSS '
~ PUMP FOR MoLTEN METAL
Filed July 3 , 1940
L....__
5 Sheets-Sheet l
«fliï»
March 3, 1942.
w. P. v. ROSS
2,275,202
PUMP FOR MoLTEN METAL
Filed July 3, 1940
5 SheeÍS-Shee’tl 2
gf. /8
79
75
da
r1
73
March 3, 1942.
W. P. V. ROSS
2,2 75,202
PUMP FOR MQLTEN METAL
Filed July 5, 1940
5 Sheets-Sheet 3
March 3, 1942.
'
w. P. v. Ross
2,275,202
PUMP FOR MOLTEN METAL
Filed July s,i 1940
5 Sheets-Sheet 4
:|
_É.
l
_illlllllllh
March 3, 1942..
W. P. V. ROSS
2,275,202
PUMP FOR MQLTEN METAL
Filed July 3, 194()`
5 Sheets-Sheet 5
2,275,202
Patented Mar. 3, 1942
UNITED STATES, PATENT OFFICE
` 2,275,202
PUMP FOR MOLTEN METAL Y
William P. V.> Ross, Battle Creek, Mich., assignor
to Duplex Printing ‘ Press Company, Battle
Creek, Mich., a corporation of Michigan
Application Ju1ya1940, serial No. 343,905' h
15 Claims.
vv(o1. .z2-7o)
This invention relates to automatic pumps
for molten metal or the like, and is particularly
adapted for use in pumping molten stereotype
metal from a melting pot into molds for casting
printing plates for printing presses, although î
the pump is obviously not restricted to such use;
and the principal object of the invention is to
provide a pump of the above type embodying
certain novel features hereinafter set forth.
I will explain the invention with reference
to the accompanying drawings which illustrate
one practical embodiment thereof, to enable
others familiar with the art to adopt and use
the same; and will summarize in the claims the
novel features of construction, and novel -com- i
binations of parts, for which protection is de
In said drawings
Fig. 1 is a side elevation of my novel'pump
looking at the loading side thereof.
-
Fig. 2 is a horizontal section on the line 2_2,
'
Fig. 3 is a front elevation of the pump looking
towards the spout.
Fig. 4 is a top plan View of the pump.
Fig. 5 is a top plan view of the melting pot,
detached, showing the pumping cylinder mount
ed therein.
'
Fig. 6 is a vertical section on the line 6_6,
Fig. 5.
Fig. 7 is an enlarged top plan View of the
pumping cylinder, detached.
Fig. 8 is a vertical section on the line 8_8,
Fig. 7.
'
Fig. 9 is an enlarged horizontal section on `
the line 9_9, Fig. 1, showing the means for
actuating the walking beam of the pump piston _
rod.
Fig, 10 is a rear elevation of the parts shown
in Fig. 9.
Fig. 11 is an enlarged vertical section through
the loading door on the line II_I I, Fig. 1.
Fig. 12 is an enlarged elevation showing the
valve operating mechanism, taken on the line
|2_-a2, Fig. 1.
`
Fig. 13 is a top plan view of the parts shown
in Fig. 12.
to the upper ends of the wall members respec
tively, said frame providing an inwardly directed
flange. In the lower portion of the casing is a
grate 8 (Fig. 1), the space below which is ac
cessible through an ash pit door 9 disposed in
the side wall 4 of the casing; also in wall 4
above grate 8 is a fire door I0 of suitable type.
Preferably, wall members 2,` 3, 4, 5 are spaced
double walls having heat insulating material 1,
of granulated or other type, disposed in the space
between said double walls, as indicated in Fig. 1.
Preferably the walls 2, 3, 4, 5 of the casing above
grate 8 are lined with ñre brick II 'extending
upwardly to the underside of frame member 6, as
indicated in Fig. 1.
sired.
Fig. 1.
lower portion of the casing is open and' rec
tangular frame 6 is mounted therein secured '
'
The pump preferably comprises a. substan
tially rectangular casing consisting of a lower
portion and an upper portion. The lower por- I
tion of the casing comprises a base I, a front
wall 2, a rear wall 3 and side walls 4 and 5 re
spectively, connected at their lower ends to the
base and connected together along their vertical- ,
edges in any desired manner. The top of the f
_
l
Suspended from frame 6 is a melting pot
I2 vof substantially rectangular shape having an
external peripheral flange I2a at its upper end
seating upon the top of frame ß, said pot closing
the upper end of the’lower portion‘of the casing.
A ñue I3 is provided in the rear wall 3 adjacent
the upper end adapted to be connected> to'a
suitable stack or the like fornproducing- draft
within the flrebox below the pot I2 and for re
moving the'smoke'fumes.
Í
"
n.
Removably- mounted upon the lower member
of said casing >is ,an upper member comprising
a cover I4 having side walls overlapping the
sides of thev casing outside the periphery of flange
IZa of melting pot I2, as shown in Figs. 1 and 11, v `
said cover also having a top I4a so as to form
a substantially closed chamber over pot I2.
Cover I4 is provided with a flueV I5 forremov
ing fumes and `gases from the molten metal in
'pot I2. Preferably cover I4 is also heat in
sulated as shown in Fig. 11 by means of insula
tion I1, similar to insulation ‘I, for the purpose
of preventing loss of heat by excessivel radiation.
In the loading side of 'cover I4 is a swinging
door I6 (Figs. 1 and 1l) pivoted on a horizontal
axis adjacent the top thereof so that said door
can be swung inwardly as hereinafter described
to permit the operator to skim the> dross from
the surface of the molten metal in pot I2, andr
said door being sufficiently large to permit in
sertion of a used stereotype plate P (Fig. 11)
for the purpose of re-melting to replenish the
melting pot I2 with metal M. Door I6 is pref
erably also double-walled withv heat insulation
therebetween, in a manner similar to the walls
>of the cover.
Extending over the top of coverk I4, when posi
tioned upon the casing, kand extending down
2
2,275,202
the rear walls of the cover and casing, is a re
movable hood I8, having an enlargement I3 at
will clear the return bore 2Ie as shown in dotted
lines in Fig. 7, but when said end of valve 22h
covers return bore 2Ie the other end will clear
outlet 22e as shown in dot-and-dash lines in
Fig. 7. Valve rod 22x is actuated automatically
its lower end seating upon an extension Ia of
base I at the rear thereof. The main portion
of hood I8 is of relatively narrow width, for
the purpose hereinafter described, and extending
and may be adjusted as hereinafter described.
laterally from the hood on the top of cover I4
A walking beam is provided in the upper por
adjacent the front end thereof is an enlarge
tion of hood I8 comprising a pair of parallel
ment 20, for the purpose hereinafter described.
swinging levers 21, 21a (Figs. l and 2) pivoted at
Within melting pot I2 adjacent the front of 10 their centers on a bracket 28 mounted on the
the casing is mounted a pumping cylinder 2|
top I 4a of cover I 4, said levers extending from
closed at its upper end by plate 2|a, and open
at its lower end which terminates adjacent the
bottom of pot I2, as shown in Figs. 1 and 6.
A removable head 22 is removably secured to
plate 2Ia by bolts 22a. Cylinder 2| is positioned
in pot I2 by means of arms 221:» and 22e formed
integrally with cylinder head 22, said arms being
disposed at angles to the side walls of pot I 2, as
shown in Fig. 5, so as to avoid interference with
the spout, hereinafter described.
a point adjacent piston rod 23 to the rear end
of hood I8. The front ends of the levers 21, 21a,
are pivotally connected to a plate 23 having an
elongated slot 29a in its front edge and slidably
receiving a pin 30a on a head 30 secured on the
upper end of piston rod 23, whereby as levers 21,
21a are swung the piston rod 23 will move up
and down with an approximate straight line
motion. The rear ends of levers 21, 21a are piv
otally connected to a plate 3| to which is con
nected the upper end of an actuating rod 32
extending down through hood> I8 at the rear of
the casing and having its lower end pivotally
Extending through a bore 22d in head 22 and
through a registering bore 2Ib in plate 2Ia of
cylinder 2| is a piston rod 23 (Figs. 1, 5 and 6)
carrying a piston 24 on its lower end, said piston 25 connected to an eccentric pin 33a on a crank
rod extending upwardly through a gland 23a
wheel 33 (Figs. 9 and 10) mounted on the driven
(Fig. 1) in the top |4a of cover I4 and into the
shaft 34a of a reducing gear 34. Gear 34 is
hood I8, opposite enlargement 2|). When piston
driven by an electric motor 35 mounted upon ex
rod 23 is at thelower end of its stroke, piston 24
tension Ia of base I, by means of a -belt 36 run
is disposed below the lower open end of cylin 30 ning over pulleys 35h and 34h on the drive shafts
der 2|, so that molten metal within pot I2 may
of motor 35 'and reducing gear 34 respectively, as
freely enter the cylinder, whereby when the pis
shown in Figs. 9 and l0. By the above construc
ton rod is raised a predetermined amount of
tion, as motor 35 is actuated, the walking beam
molten metal will be forced upwardly within the
21, 21a Will be oscillated to reciprocate piston rod
cylinder and into and through spout 25 (Fig. 1) 35 23. Preferably the hood I8 and its enlargements
connected with an outlet 22e in the valve chest
I9 and 20 are provided with suitable louvres as
formed between cylinder plate 2Ia and a recess
shown in Figs. l and 3 to allow circulation >of air
22j (Fig. 8) in the underside of cylinder head 22.
therethrough to prevent undue heating of the
Spout 25 extends through a` large opening- |42:
motor and other operating parts of piston rod
(Fig. 1) in the wall of cover I4 at the front of 40 23 and the automatic Valve actuating means.
the casing, and preferably the portion of spout
As previously stated, return duct 2|@ in cylin
25 projecting out of cover I4 in enclosed in a
der plate 2Ia returns excess metal delivered by
casingY 26 which- is> enlarged at its inner end and
the cylinder 2| back into melting pot I2. The
is connected to the side of cover I 4 covering the
proportion of metal raised by piston 24 which
opening |41', so that the hot fumes in the cover
passes into delivery spout 25 through outlet
I4 above the melting pot I2 may circulate freely
openingA 22e is regulated by the setting of Valve
along and around spout 25> and prevent the
plate 22h within the valve chest at the top of
molten metal therein from solidifying before
cylinder 2| and which Valve 22h is secured to
same has'reached the outer end of spout 25.
the lower end of valve rod 22x. When the full
A valve is providedY in the valve chest formed 50 quantity of molten metal raised by piston 24 is
between the plate 2Ia and recess 22j in cylinder
not permitted by valve plate 22h to pass into
head 22, for the purpose of regulating the amount
spout 25, the overñow descends through duct 2|e
of molten metal forced into spouty 25 on each up
back into pct I2, agitating the molten metal
ward stroke of piston 24'. As shown, the valve
therein and keeping its components well mixed
chest communicates constantly withA cylinder 2| 55 without requiring any additional mechanical or
through two open ports 2 Ic, 2|d (Fig. '7) in plate
manual means for suchpurpose. The upper end
2 Ia within the area of recess 22]c of head 22, said
of valve rod 22:0 is journaled in a bearing 39a
ports 2Ic, 2Id permitting entry of molten metal
in a frame 39 secured to the top I 4a, of cover I4
from cylinder 2| into the valve chest. In the
of the casing within the hood enlargement 20. A
plate 2Ia, offset from outletY 22e, is a bore 2Ie
lever 36 (Figs. 12 and 13) on the upper end of
(Figs. '7 and 8) forming a return duct for the
valve rod 22x within hood I8 is connected by an
molten metal from the valve chest to pot I2, the
extensible link 3'! to a lever 33 on rock shaft 40
walls of said bore A¿Ie extending downwardly
journaled in bearing 33h so that when said> shaft
through an exteriorr enlargementv 2| f of> cylinder
is rocked, valve rod 22h will be shifted to con
2| and terminating adjacent the lower open end 65 trol the relative amounts of uncovered areas of
of the cylinder 2 I, whereby the metal discharged
through said bore into pot I2 will agitate' the
molten metal therein keeping the components
therein well mixed‘without necessitatingY addi«
outlet 22e and the return duct 2 ie (Fig. 7) .. Link
31 is equipped with a threaded section 31a for
initially adjusting the limits of swinging move
ment of valve 22h to provide different ratios of
tional mechanical or manual means. Journaled 70 uncovered portions of outlet 22e and duct 2| e.
in a bearing 22g (Fig. 8) in head 22 between the
Shaft 40 carries a gear 4| meshing with a gear
axes of bore 2| e and outlet 22er is a valve plate
42, twice the diameter of gear 4I, said gear 42
22h mounted on a valve rod 22x and being of
being mounted on a shaft 43 journaled in bearing
such shape and area that when one end thereof
39e of frame 39 and parallel with shaft 40. Piv
covers~the outlet 22e of head 22 the other end 75 ‘ oted on shaft 43 is a rocker arm 44 connected by
2,275,202
3
a link 45 to one arm 46a of a bell-crank lever
lines in Fig. 7.' By adjustment of link 3'I'-.-3'Ia.
journaled at 47 in a bearing 39d of frame 39, the
other arm 48h of the bell-crank lever having an
elongated slot 46c therein which slidably receives
of the 'valve mechanism the relative amount of
opening of both ports 22e-2Ie may be varied,
to wit, the movement of the valve 22h may be
regulated to entirely close return duct 2 Ie in one
position and leave outlet 22e wide open, or to
close outlet 22e leaving duct 2|e> wide open, or
the'valve 22h may be regulated to partially close
both ports. Thus the valve 22h may be initially
set to deliver all the metal back to the pot I2,
or to deliver all the metal to the spout 25; or
with both ports partially opened to delivery only
sufficient metal to the spout to forma complete
a roller 30a: on the head 38 at the upper end of
piston rod 23 .within hood I8. As bell-crank
lever 46a-48h is rocked by the vertical motion
of head 38, link 45 rocks the arm 44 which is
freely mounted on the shaft 43 and which car
vries at its outer end a hinged member 44a
equipped at its free end with an elongated roller
44h freely journaled on a stud 44C, where-by as
arm 44 is rocked the roller 44h will roll on the
periphery of a four-toothed ratchet disk 48 hav
plate, the surplus metal being returned to melt
ing pot I2.
ing undercut teeth indicated at 48a, 48h, 48o and
48d: and in the positions of the parts as shown
in Fig. 12, roller 44 would engage the uppermost
tooth 48a at the top of disk 48 if such engage
ment Were not obstructed. Preferably disk 48
is secured directly to gear 42 so that the gear
may be mounted freely on shaft 43. On the
v
outer face of disk 48 are tWo diametrically op
posed studs 48e and 48j.
A dog 55 (Fig. 12) prevents disk 48 from ro
tating in the wrong direction by engagement of
the projection 55a thereof with the teeth 48a,
48h, 48e and 48d in succession, said dog swing
ing on a stud 53 as the disk 48 is rotated by roll
44h in the direction of the arrow (Fig. 12).
A guard leverA 49 is shown in Fig. 12 in its ob
structing position, said lever being fulcrumed
on a stud 50 ñXed in the frame 39 beside disk
48, and said lever being provided with projections
49a and 49h. Projection 49D is adapted to be
normally engaged by a tooth i'slbI on the upper f
end of a pawl 5I, which pawl swings on a stud
52 fast in the frame 39, and is provided with
a lower projection 5Ia which, until the pawl is
released, engages with lowermost stud 48e (Fig.
12) on disk 4B to positively hold the disk against
When ready to cast, the handle 52h (Figs. 1
and 13) is rotated through one complete turn
(360°) thereby rotating cam 52a, and swinging
tooth 5Ib of pawl 5I out of locking engagement
with the end 49h of guard lever 49, and lugv 5Ia
of pawl 5I out of engagement with stud 48e of
disk 48, thereby allowing guard lever 49 to rock
on stud 50‘so that its outerl end lies below the
tooth 48a and below the path of the roller 44h.
On the subsequent up-stroke of Ipiston rod 23,
roller 44h drops into the uppermost tooth 48a
of the disk 48, so that on the following down
stroke the lever 44 will turn the disk 48 one
quarter revolution and through the gears 42 and
4I will rotate the shaft 40‘ one-half revolution,
and through lever 38, link 3l, and arm 36 on
valve rod 22x, will swing valve 22h to uncover
outlet 22e to the spout 25 and close the return
duct 2Ie. The next upstroke of the piston rod
23 forces the molten metal in the cylinder into
the spout 25 and causes the roller 44h to engage
the next tooth 48h of disk 48 which is then in
the position formerly occupied by tooth 48a. The
Il)
rotation, while the diametrically opposite stud
48j (Fig. 12) is adapted, as the disk 48 is ro
tated in the direction of the arrow in Fig. 12,
to engage the underside of projection 49a of
guard lever 49 and swing said lever so that its
end 49h will be engaged by the pawl tooth 5Ib‘.
The edge 5Ic of the pawl 5| is engaged with
next downstroke of piston rod 23 therefore ro
tates the disk 48 and gear 42 another quarter
turn, thereby rotating gear 4I and shaft 48 a
secondhalf revolution. During such latter ro
tation of disk 48 the stud 481‘ will engage the
underside of guard lever 49 and raise said lever
into position to be engaged by tooth 5Ib of pawl
5I, thus restoring the different members to the
a cam 52a mounted on a manually operable shaft
positions shown in Figs. 12 and 13 upon the com
pletion of a full half rotation of disk 48. 'I‘hus
52 rotatably mounted in the frame 39, said shaft
while the -piston rod 23 is reciprocated by the
52 having one end projecting through casing 20 "1* motor 35, the valve 22h will remain stationary
and journaled in a bearing 53 (Fig. 1) and hav
and covering outlet 22e until crank 52h is again
ing a crank 521) (Figs. 1 and 13) which may be
rotated to permit actuation of the valve mecha
equipped with the trip handle for the convenience
nism.
of the operator.
I claim:
1. In a metal pump having a casing contain
Operation
To operate the pump the motor 35 is actuated
by closing a manually operated switch (not
shown), thus reciprocating the pump piston 23
through the rod 32 and walking beam 21, 21a.
The valve 22h in normal position closes outlet 22e
to spout 25 causing the entire flow of molten
metal from cylinder 2I to be discharged through
the return duct 2Ie, thereby agitating the metal
in pot I2, the valve operating parts normally be- v’
ing in the positions shown in Figs. 12 and 13.
Enough molten metal for casting a stereotype
plate must pass, through the pumping cylinder
ing a melting pot having a pumping cylinder and
having a continuously reciprocating piston in
said cylinder; a valve chest having an inlet from
said cylinder and having an outlet provided with
a spout; said valve chest having a return duct
discharging into the pot; a valve in said chest
adapted to be moved by the piston into posi
tions across the outlet and return duct; means
for normally holding said valve in position to
close the outlet and to open the return duct;
and manually operable means for releasing the
holding means to permit said valve to be shifted
into position to close the return duct and open
and through the outlet 22e in the valve chest to
the spout 25 and into the mold or casting box
the outlet.
(not shown), the surplus metal passing through
said holding means comprising normally inactive
valve actuating mechanism actuated by the pis
ton and adapted when activated to open the out
return duct 2Ie back into melting pot I2. Nor
mally valve 22h closes the outlet 22e and main- ’
.
2. In a metal pump as set forth in claim 1,
tains the return duct 2Ie opened, the valve 22h
let and close the return duct during one pump
normally assuming the position shown in dotted
ing stroke of the piston.
4
2,275,202
metal discharged from the pump may be regu
lated, the excess pumped metal returning to the
claim
3. In1,combination
means for initially
with a;pump
settingas the
set 4valve
forth to
pot through the return duct.
,
9. In a metal pump as set forth in claim 8,
expose various-ratios of uncovered areas of said
outlet and return duct while the molten vmetal
is being passed to the spout, whereby the amount
of metal passed thereinto may be regulated,y the
excess pumped metal being returnedv to the pot
through the return duct.
said holding means comprising normally inactive
valve actuating mechanism actuated by the piston
and adapted when actuated to open the outlet
and close the return duct during one pumping
i
stroke oi the piston.
4. In a pump as set forth in claim 1, said’hold
.
10. In a metal pump having a melting pot con
taining a pumping cylinder and having a con
tinuously reciprocating piston in said cylinder; a
valve chest having an inlet port from the cylinder
ing means comprising a rotatable member jour
naled on said casing; means actuated byV said
member for moving the valve; a ratchet on said
member having peripheral teeth; Van arm pivoted
coaxially of said ratchet; means for> oscillating
and having an outlet provided with a spout; said
said arm; a yieldable pawl on said arm engaging
the teeth of said ratchet; means for normally
valve chest having a return duct discharging
into the pot; a valve in said chest movable by
the piston between the outlet and duct; said
cylinder having its lower end open and terminat
ing adjacent the bottom of the pot, and having its
preventing the pawl from engagingthe teeth;
and said manual means shifting the preventing
means.
upper end closed; a head on said closed upper
end having a recess in its underside forming with
said end the valve chest; and said return duct
5. In a metal pump having a casing contain
ing a melting pot having a. pumping cylinder
and having a reciprocating piston in said cylin
der; a valve chest having> an inlet from said
cylinder and having an outlet provided with a
spout; said valve chest having a return duct
discharging into theY pot; a valve in said chest
adapted to be moved into positions across the
discharging adjacent the bottom of the pot
whereby the flow of molten metal from the vvalve
chest into the pot will maintain the contents of
the pot agitated.
1l. In a metal pump having a melting pot
containing a pumping cylinder and having a
reciprocating piston therein; a valve chest hav
ing an inlet from the cylinder and having an out
let and having a return duct discharging into the
pot; a valve in said chest adapted to be moved
into positions to cover thev outlet and return duct,
said valve normally closing the outlet and open
ing the returnV duct; a gear journaled on said
pump; means actuated by said' gear for moving
the valve; a second gear meshing with the ñrst
outlet and return duct; normally _inactive valve
actuating mechanism holding the valve in posi
tion to close the outlet and to open the return
duct; normally inactive means actuated bythe
piston for actuating the valvel mechanism; and
manual means for releasing said inactive means
for actuating the valve actuating mechanism
and shift the valve to close the return duct and
open the outlet on one down stroke ofl the -pis
ton, and on the next down stroke» to restore the
gear; a ratchet on» said second gear having pe
ripheral teeth; an arm besideV the ratchet; means
valve to normal position.
6. In combination with a pump as set forth in
claim 5, means in said valve actuating mechanism
actuated by the piston for oscillating said arm;
a yieldable pawl on said arm adapted to engage
a tooth of the ratchet and rotate the ratchet a
for initially setting the valve into position to ex
pose various ratios of uncovered areas of said
outlet and return duct while the molten metal
is being passed to the spout, whereby the amount
of metalv discharged from> the spout may-be regu- -
lated, the excess pumpedmetal being returned
tc the pot through the return duct.
7. In a pump-as set forth in claim 5, said valve
actuating mechanisrnincluding a rotatable mem
ber journaled on said casing; means actuated by e
said member> for moving the valve; a ratchet on
said member having peripheral teeth; and said
12. In a pump as set forth in claim il., said
preventing means comprising a pivoted guard
beside the ratchet normally positioned to pre
vent the pawl from engaging said teeth until
the guard is shifted by said manual means.
13. In a pump as set forth in claiml 1l, said
preventing means comprising a trip and a guard
beside the ratchet and having one end normally
normally inactive means comprising an arm
pivoted coaxially of said ratchet and` oscillated
by the piston; a yieldable pawl on said- arm
adapted to engage a tooth of the ratchet and
rotate the ratchet a partial turn; a guard nor
engaging the trip and its other end positioned to
bridge the ratchet tooth; said manual means
when actuated shifting the trip to permit the
ratchet to be turned successive partial turns;
mally preventing the pawl from engaging said
tooth; and said manual means shifting said
guard.
partial turn; means for normallypreventing the
pawl from engaging said teeth; and manual
meansV for shifting the preventing' means'to per
mit the ratchet to-be rotated-to clese'the return
duct and open'the outlet.
60 and means on the ratchet adapted to restore the
8. In a metal pump having a casingv containing
a melting pot having a pumping cylinder and
having a continuously reciprocating piston in said
cylinder; a valve chest having an inlet from said
cylinder and having an outlet provided with a
spout; said valve chest having a return duct dis
charging into the pot; a valve in said chest;
means for normally holding the valve in position
to close the outlet and to open the return duct;
means operated by the piston for shifting the 70
guard and trip to normal positionsV after a pre
determined number of partial turns.
14. In a metal pump having a melting pot con
taining a pumping cylinder and having a continu
ously» reciprocating piston therein; a valve chest
provided with an inlet fromthe cylinder,` an out
let, and a return duct tothe pot; a valve in said
chest normally closing the outlet and opening
the return duct; a rotatable member; means
actuated by said member for moving the valve; a
toothed ratchet on said member; an oscillating
valve to pass molten metal pumped on the up
arm beside the ratchet actuated bythe piston; a
stroke of the piston through the spout; and means
yieldable pawl on said arm adapted to engage
for initially setting the valve into position to ex
a ratchet tooth and intermittently rotate the
pose various ratios of uncovered areas of the
outlet and return duct, wherebyY the amount of 75 ratchet during a down stroke of the piston; a
2,275,202
5
trip; , a pivoted guard beside the ratchet normally
means actuated by said member for moving the
maintained by the trip into position to bridge the
adjacent tooth; and manual means for shifting
valve; a toothed ratchet on said member; an
the trip to permit the ratchet to be rotated and
thereby close the return duct and open the out
let; said ratchet teeth being spaced 90° apart;
and a pair of diametrically opposed lugs on the
ratchet adapted to engage the guard as the
oscillating arm beside the ratchet actuated by
the piston; a yieldable paWl on said varm adapted
to engage a ratchet tooth and intermittently
rotate the ratchet during a down stroke of the
piston; a trip; a pivoted guard beside the ratchet
normally maintained by the trip into positio-n to
ratchet turns and restore the guard and trip to
bridge the adjacent tooth; and manual means for
normal positions, whereby the ratchet will be
rotated through two successive quarter turns by
two successive down strokes of the piston before
the guard is restored to normal position.
shifting the trip to
rotated and thereby
open the outlet; said
90° apart; a pair of
permit the ratchet to be
close the return duct and
ratchet teeth being spaced
diametrically opposed lugs
15. In a metal pump having a melting pot con
on the ratchet adapted to engage the guard as
taining a pumping cylinder and having a con
the ratchet is turned and restore the guard and
trip to normal positions; means for preventing
tinuously reciprocating piston therein; a valve
chest provided with an inlet from the cylinder,
an outlet, and a return duct to the pot; a valve
in said chest normally closing the outlet and
opening the return duct; a rotatable member;
backward rotation of the ratchet; and means co
operating with said l-ugs to prevent forward rota
tion of the ratchet until the trip is shifted.
WILLIAM P. V. ROSS.
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 014 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа