|Publication number||US836350 A|
|Publication date||Nov 20, 1906|
|Filing date||Apr 5, 1901|
|Priority date||Apr 5, 1901|
|Publication number||US 836350 A, US 836350A, US-A-836350, US836350 A, US836350A|
|Inventors||Samuel J Webb|
|Original Assignee||Samuel J Webb|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (2), Classifications (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
No. 836,350. PATENTED NOV. 20, 1906. S. J. WEBB. E HYDRAULIC PRESS WITH DOUBLE PISTON RAM.
APPLICATION FILED APR.5,1901.
PATENTED NOV. 20, 1906.
s. J. WEBB. HYDRAULIC BEBES WITH DOUBLE BIsToN BAM.
APPLICATION FILED APR.5.1901.
2 SHEETS-SHEET 2.
3m. ue vn to@ rnviTEn srArEs PATENT oEEioEo SAMUEL J. WEBB, OF MINDEN, LOUISIANA.
HYDRAULIC PRESS WITH DOUBLE-PISTON RAM.
Speeicaton of Letters Patent.
I Patented Nov. 20, 19(16.
Application filed April 5, 1901. Serial No. 54,536.
with Double-Piston Rams, of which the following is a specification.
My invention relates to hydraulic presses for compressing cotton and other similar materials, and it has for its object to provide an improved construction and arrangement of hydraulic-press involving more particularly what may be termed a double-piston ram operating in connection with the press proper; and to these ends my invention consists in the various features of construction and arrangement of parts, havinfrthe general mode of operation substantially as hereinafter more particularly pointed out.
Referring to the accompanying drawings, Figure 1 is a vertical section of thedoub episton ram, showing the parts in what may be termed their normalf positions..- Fig. 2 is a similar sectional view of the double-piston ram, showing the parts in another position. Fig. 3 is a vertical section of a press proper, which in this instance is shown connected to the double-piston rain of Fig. 2. Fig. 4 is an enlarged inverted plan view showing the rock-shafts With an arrangement of cams suitable for operating the various* valves, these being shown on a slightly enlarged scale for the' purpose of clearness. Fig. 5 is a perspective view of the valve arrangement shown in Figs. 2 and 4. .Fig- 6 is a siii e view of the valves and operating devices therefor. Fig. 7 is a sectional view showing the referred construction of the valves., and Fig.,8 is a plan view of the distance-piece.
In carrying out my invention it will be understood that the hydraulic press proper may vary in construction7 that "shown in the drawings being for the purposes of illustration and being one well adapted for use in connection with a d crible-piston ram, and it is to be understood that my invention is not limitel to the use of the particular press shown and escriberl. This press A consists, generally stated, of a stationary body or platen A', which is connectedl by suitable rods, as A2, to the hydraulic cylinder A3, which is suitably mounted or supported on a proper base A1. This hydrau ic cylinder A3 may have any desired number of cylinders A5, two
being shown in the present instance, connected at the bottom by a passage A.
Mounted in these two cylinders A5 are the.
rams A1, which may be of any desired construction, but which in the present instance are shown as hollow rams of a length slightly less than the length of the cylinders A5.
Connected to move in connection with the stationary bed or platen A is a movable bed or platen As, and this in the present instanceA is guided by the rods-A2 and is connected to rthe rams A7, and while the connectons may vary, in the present instance I have shown distance-pieces A9 recessed on their upper faces and adapted to iit projections A10 on the under side of the movable platen A8 and havingsimilar projections A11 `adapted to fit corresponding recesses in the .tops of the,
rams A1. These projections are not absolutely necessary, but are advantageous in lo.
eating and holding the parts together, and in the present instance I have shown screw rods or bolts A12, the heads being countersunk in the top of the movable platen A8 and theirstems passing through openings in the dis`-;
tance-pieces and taking into screw-threaded openings in the tops of the rams. These distance-pieces AD are preferably provided with slots w, extending from their central opening to one side, so that when the screwbolts A12 are'loosened the distance-piecesA".
can be removed and the screw-bolts A12 operated so as to permit the rams A7 to descend to the lowermost position in the cylinders A5,
readilyy manipulated for adjustment or repairs, the platen A11 being held or blocked up enough to clear the distance-pieces while this is beingdone.
The movable platen As in the present instance is shown as pro vided .with a grooved bed-plate A14, which may be removably supported on the moving platen A8, but preferably, as shown in the present instance, the
plate is made in three sections and the sideV "9 exposing the packing-rings A13 in the upper` portions of the cylinders, so that they can beY ICO extending projection B5, and may be made of any desired length, but preferably about onefourth the length of the stroke, as shown. Mounted in the cylinder B is a low-pressure piston C, to which is attached or formed integral therewith a ram C having a iston-head C2, Working in the cylinder B3. his ram is itself cylindrical and hollow and forms a hydraulic cylinder D for the ram D', mounted 1o on' the high-pressure piston D2, working in the cylinder B, and arranged in the present instance so that the ram D passes through a central opening C4 in the piston C and the ram C. This cylinder D inthe ram C is of a size to receive the projection B5 when the arts are in the positions shown in Fig. 2.
he stems of the rams Cl D are provided with heads and packings so as to avoid exposing, the stems to the liquid and heating the zo liquid in the cylinders, which it is important to avoid when the same liquid is used continuously. In operating hydraulic rams of this character it is essential to provide some means for cushioning the parts toprevent .z 5 accidents from shocks, &c., especially when they are rigidly operated, and in the present instance all the moving parts of the pistons and rams are so provided. For instance, the
low-pressure piston C is provided with a pro- 30, jection C5, which is ada ted to iit more or less closely in the cylinder 3 and form a cushion when the piston is moved upward by cutting off the escape through the vent-pipe, hereinafter described. This piston is also formed 3 5 with a recess C6 in the under side, Which is adapted to receive a projection D3 on the upper side of the high-pressure piston D2, and this high-pressure piston is further pro- .vided with a projection D4 on its under side, adapted to enter a recess B5 in the head B2, controlling the exhaust from the cylinder. Furthermore, the ram C', which, as before stated, receives'the projection B5, serves as a cushion by cutting off the main outlet from the cylinder B3.
All the parts of the pistons and rams vare provided with suitable packing, as indicated. Thus the low-pressure piston C is provided with packing c, the ram C with packing c. The piston D2 is provided with packing d, and the central opening C4 in the piston C, through which the ram D/ passes, is provided with packing d. So also the recess C3 inthe piston C, and the recess B in the head B2 55 and head B1 are provided with packing, as
indicated but not specifically lettered.
The cylinder B3 is provided with a port B, which in the present instance is shown in the form vof a passage through the projection B5, and connected to this port is a pipe E, leading to the hydraulic cylinder A3 of the press A andshown in the present instance as connected to the passage A thereof at the point- E. No valve need be supplied to this pipe 6 5 between the cylinder B3 and cylinders A5, as
the water or other fluid'contained in the pipe and cylinders is used over and over, being drawn forward or backward in operating the press, and communication between the press cylinders A5 and the low-pressure cylinder B3 of the ram is cut off When the low-pressure piston C and its ram C are in the positions shown in Fig. 2, or in the latter part of its (sitrollge by the projection B5 entering the cylin- In order that the low-pressure rain Cl may attain the posit-ion shown in Fig. 2, the projection B5 enters t-he cylinder D and thereby cuts off the flow of fluid through the port B5, and the pipe E is provided with a by pass G, connect-ing the head B4 of the cylinder and the pipe E and provided with a valve\G, wh ich opens automatically under pressure to allow the fluid to ow from the top of the cylinder B3 into the pipe E, and may be in the form of a Asimple check-valve,l In order, however, to provide means to allow the ram C to move from the position shown in Fig. 2, it is necessary to allow fluid to pass into the top end of'the cylinder B3, and I accomplish this by providing some means of operating the valve in the by-pass G, and in the prescnt instance I have shown a lever G2, having a cam g, adapted to open the check or other valve G.
The pistons in the present instance are adapted to be operated by steam-pressure, and I therefore provide a suitable steampipe H, connected with any source of supply, and from this main steam-pipe leads a pipe H to a pipe I, attached to the head B2, and connected to the high-pressure piston D2 is a pipe I', which recprocates with. the piston and moves up and down in the pipe I. This pipe I is suitably connectedso as to deliver steam between the low and high pressure pistons C and D2, and in the present instance the ram D is made hollow at its lower portion D5 and the pipe I is connected thereto, While an o ening or openings d5 are made in the ram D to permit steam-to pass out of the hollow extension D5. Also leading from the steam-pipe H is a pipe H2, which in the present instance is shown as entering the recess B6 in the cylinder B below the high-pressure piston D2. There is an exhaust-pipe H3 connected to the steam-pipe H by a pipe H4 and to the steam-pipe H2 by a pipe H5, and interposed in the pipes are suitable steam-valves G3 G5 and exhaust-valves G4 G5, and these valves may be. controlled in any suitable way, as by the levers J J', vmounted on a bracket J 2 on the press proper. In the present instance I have shown two rock-shafts J3 J4, provided, res ectively, l.with levers J5 J6 and having suita le cams g3 g4 g5 g3. j These levers J5 J 5 are respectively connected-to the operating-levers J and J by any suitable means, as the connecting-links J3 J7. So also the operating-lever J is connected to opy erate the valve lG' in any suitable way', as by the connecting-rod J 2, lever J1", and rod J, connected to lever G2. There is a pipeK connected to the head B' of the cylinder B, which serves as an air-vent through which air may flow to and from the cylinder B.-
above the low-pressure piston C, the upward iiow of air being 'cut off by the projection C5 when it moves upward, entering the opening in the head B', so that the movement of the low-pressure piston upward is properly cushioned, as before set forth.
1 Such being the preferred construction and arrangement of parts, when the parts of the A ram are in the positions ,shown in Fig. l and it is desired to operate the movable platen A8 of the press A, Irst operate thelow-pressure piston C by admitting` steam between the twov pistons C and D2. In order to do this in the present arrangement, the hand-operatinglever` J is moved in the proper direction, (toward the point 6,' Fig. 3,) so as to operate the valve G and admit steam into the pipe I,
which steam passes through the pipe I',
through the hollow portion D5 of the ram D',
and out through the opening or openings d5 cylinder D between the pistons, and the piston C is forced up to about the position indicated in Fig. 2. In doing this the ram C' has forced the fluid from the cylinder B5 through the pipe E into the hydraulic cylinders A5, operating their rams A7, lifting the movable platen A2, and compressing the material between the platens. In doing this, as the ram C' passes over the projection B5 the flow of Huid through the port B7 is cut off but the pressure in the end of the cylinder o ens the check-valve G in thel by-pass G, an the fluid continues to flow through the pipe E. When the projection C5 enters the opening in the head B and cuts 0H the flow of air through the pipe K, a portion of the air is confined between the head B' `and the top of the piston C, forming a cushion. The valve G6 is closed by moving the lever J to the left to its normal position.y The lever J' is then moved to the right to the point indicated by 3 in the arc above the lever, and thiseoperates rockshaft J 5 and through the medium of the cam g? opens the steam-valve G2, and steam is admitted through the pipe H2 under the highpressure piston-D2, and this is forced upward, driving the ram D', with its head D6y in the L of the ram C', forcing the fluid therefrom into the pipe E, and owing to the relative size of the piston D2 and the head D5 of the ram D the fluid-pressure is largely increased, and the rams A7 are forced upward under this -final pressure, completing the pressure on the bale or other material between the platens. Coincident with the opening of steam-valvelG3 one of the cams g'1 on the rock-shaft J3 has been operated to a Greater or less eXtent,so as to partially at ljeast operate; exhaust-valve G4, so as to permit more or less of the steam between the pistons C and D2 to escape and offer no resistance to the movement of the piston D2;
l but sufficient is retained to sustain thevweight of piston C when the ram is worked in a vertical position, as shown in the drawings, but this is not necessary if the ram is worked horizontally, andthe lever J' can be moved to the right beyond the point 3 in the arc, as to the point 4, in completely exhausting the steam between the pistons C and D2 when it is desired to do so. When the ,pressure upon the bale is complete, the lever J' is returned to its normal position shown and all the valves are closed, while the material, as the bale of cotton, is being manipulated-as, for instance, being banded. When this is being accomplished, the lever J' is moved to the left to the points indicated by the numerals 1, 5, and 4 on the arc above the lever, and in doing this check-valve G' is opened by the cam on the lever G2, the exhaust-valve G5 is opened by the cam g5 on the rock-shaft J", and the exhaust-valve G4 is opened by the other portion of the double cam 91 on the rock-shaft J5, which allows all the steam to escape and the parts to return to their normal positions. It will be observed that there is no back pressure offluid from the pipe E on the ram C' tending to cause the low-pressure piston to descend,`as this pressure is cut off by the projection B5 entering the ram C', and the check-valve G' vprevents the backward4 l flow of the fluid through the by-pass pipe G. 4When the bale or other'material has been sufmay be admitted or exhausted with the pis-C,
tons at any points of their strokes'.
When it is desired to pack the rams A7, the platen A5 is blocked up high enough to clear the distance-piecesA2, the side sections A15 of the plate A14 may be removed, the screws A12 loosened, and the distance-pieces A2 removed, and then the rams A7, being shorter than the cylinders A5, will while resting on the bottom of said cylinders permit access to the packing-rings A13.
It may be remarked that instead of using separatedistancepieces A2, these may be in the form of integral projections on the under side of the platen A5.
In actual practice I preferablymake thel ram C' tapering, being thicker at its end most distant from the piston C, where the greatest I pressure is upon the hydraulic cylinder D inside the rain, and this conduces to lightness and cheapness and provides strength at the proper place. ram D with a body portion smaller than the cylinder D, so as to leave a space between them to prevent radiation of heat, the head D6 of the ram of course fitting closely the cylinder D and being provided with proper packing d6. 1
In order that the hydraulic cylinder B3 may be kept cool, I preferably provide a narrow bearing-surface b at the-end Where it rests on the head B, and 'also surround it with a water-jacket bf.
What I claim is- 1. In a hydraulic press, the combination with a hydraulic cylinder, of a movable platen, a plurality of rams operating in the hydraulic cylinder, bolts connecting the platen with the respective rams, and a sectional plate secured to the platen to cover said bolts, whereby the removal of one section ofthe plate will afford access to the connecting-bolts of one or another of the rams, substantially as set forth.
2. In a hydraulic ram, the combination with a cylinder, of two pistons working in the cylinder, one of the pistons having a recess and the other a projection serving as a cushioning device between their adjacent faces, substantially as described.
3. In a hydraulic ram, the combination with a cylinder, of two pistons working in the cylinder, pipe connections and valves for delivering steam to and from the space between the twopistons to operate one of the same and for delivering steam to and from the space behind the other piston, said valves being constructed and arranged to admit and exhaust steam to and from the space between the pistons when the same are at any point of their stroke, substantially as described.
4. In a hydraulic ram, the combination with a cylinder, of pistonsworking therein and having high and low pressure plungers attached thereto, pipe connections and valves for delivering steam between the pisvtons for operating the pistoncarrying the low-pressure plunger and behind the piston carrying the high-pressure plunger, said valves being constructed and arranged to admit and exhaust steam to and from the. space between the pistons when the same are at any point of their stroke, substantially as described. I
5. In a hydraulic ram, the combination witha steam-cylinder and a hydraulic cylinder connected thereto, of a high and a low pressure piston in the steam-cylinder, one of the pistons carrying a ram working 1n the hydraulic cylinder and the other piston carrying a piston-head working in the ram of the first piston, and means coacting with the low-pressure ram and in virtue of which the latter re- So, too, I preferably make the lieves itself of back pressure after being carried a part of its stroke and is held in this position while the high-pressure piston is being operated to give the final pressure, substantially as described.
6. In a hydraulic ram, the combination with a steam-cylinder, and a hydraulic cylinder connected thereto, of two pistons working in the steam-cylinder, one Aof the pistons being provided with a hollow ram fitting the hydraulic cylinder, the other piston being provided with a ram fitting the hollow ram, a passage in one of said pistons, and a pipe connectedthereto extending outside the steam-cylinder whereby steam may be delivered between the two pistons or exhausted therefrom when either of the pistons is in any position, substantially as described.
7. In a hydraulic ram, the combination with a steam-cylinder, and a hydraulic cylinder connected .thereto having a hollow projection in its outer end, of a piston mounted in the steam-cylinder, a hollow hydraulic ram mounted thereon and adapted to embrace the projection in said cylinder, av pipe leading from said projection, and a by-pass provided with a valve connecting said pipe with the end of the cylinder, substantiallyas described.
8. In a hydraulic ram, the combination with a steam-cylinder, and a hydraulic cylinder connected thereto, of a high and a low pressure piston working in the steam-cylinder, a low-pressure hydraulic ram connected to one piston and forming a high-pressure cylinder, a high-pressure piston connected to the other piston and working in said-'highpressure cylinder, and means for automatically cutting off the exhaust from the front of low-pressure steam-pistonl to form a cushion for said piston, and means for automatically cutting oli the exhaust from between the istons to form a cushion to prevent their striking each other, substantially as described.
9. In a hydraulic ram, the combination with a steam-cylinder, and a hydraulic cylinder connected thereto, of high and low pressure pistons in the steam-cylinder, a ram connected to each piston, and a steam-pipe connected to and moving with one ofthe pistons to deliver steam between the pistons and allow it to exhaust therefrom, substantially as described.
10. In a hydraulic ram, the combination with a steam-cylinder, and a hydraulic cylinder connected thereto, of high and low pressure pistons in the steam-cylinder, a ram connected to each piston, a steam-pipe connected to and moving with one of the pistons to deliver steam between the pistons, and allow it to exhaust therefrom, and a tele.-
scopic section connected to the steam-cylinder in which said pipe operates, substantially as described. y
11. In a hydraulic machine, the combina- IOC IIO
tion`of a'lowpressure hydraulic cylinder having a ram or plunger adapted to work therein and an opening communicating with the pipe leading to the apparatus to be operated, a high-pressure hydraulic cylinder having a ram or plunger ada ted to work therein, means for operating t em, and means whereby the low-pressure ram or plunger will .cut off communication between the low-pressure cylinder and the apparatus to be operated and prevent pressure in the low-pressure cylinder while the high pressure is being applied to the other ram, substantially as described.
12. A hydraulic machine, having a hollow low-pressure ram fitting a hydraulic cylinder and a high-pressure ram adapted to work within the low-pressure ram, and means 'for preventing pressure on the forward end of the low-pressure ram while the high-pressure ram is being operated, substantially as described.
13. A hydraulic machine, having a hollow low-pressure ram fitting a hydraulic cylinder and a high-pressure ram adapted to work within the low-.pressure ram, means for operating both rams, and means for preventing pressure on the forward end of the lowpressure ram while the high-pressure ram is being operated, substantially as described. y
14. In a hydraulic ram, the combination with amotor-cylinderand a hydraulic cylinder connected thereto, of two pistons working in the motor-cylinder, the forward piston carrying a hollow ram tting the hydraulic cylinder, the rear piston carrying a ram fitting the cylinder of the hollow ram, and means whereby the pressure in the low-'pressure cylinder is cut 0H to prevent its ram from being forced back while the high pressure is being 4o applied by the other ram, su stantially as de scribed.
15. In a hydraulic ram, the combination with a steam-cylinder and a hydraulic cylinder connected thereto, of pistons having a low-pressure plunger and a high-pressure plunger lconnected thereto, each piston working in the steam cylinder, the lowpressure plunger being hollow and having a pistonhead on its forward end fitting the hydraulic cylinder and bored to form a cylinder, the other plunger carrying a pistonhead on its forward end and fitting the cylinder of the hollow plunger, and independent means for directing the motor fluid etween and back of the istons, substantially as described and for t e purposes set forth.'
16. In a hydraulic ram, the combination of a low-pressure cylinder having a ram adapted to work therein, said lowpressure ram having a-piston or head at its outer end, a high-pressure cylinder having a ram adapttons and means for applying power thereto to operate the rams, and means coacting with -the piston of the low-pressure ram whereby pressure is prevented in the low- Cpressure. cylinder while the high-pressure ram is being operated, substantlally as set forth.
f In testimony whereof I, have signed myl name to this specification in the presence of two subscribing witnesses.
SAMUEL J. WEBB.
' F. L. FREEMAN,
W. CLARENCE DUvALL.
ed to work therein, independent motor-pis-l
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