US3180093A - Hydraulic props - Google Patents
Hydraulic props Download PDFInfo
- Publication number
- US3180093A US3180093A US292274A US29227463A US3180093A US 3180093 A US3180093 A US 3180093A US 292274 A US292274 A US 292274A US 29227463 A US29227463 A US 29227463A US 3180093 A US3180093 A US 3180093A
- Authority
- US
- United States
- Prior art keywords
- reservoir
- pump
- shaft
- ram
- release valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
- E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
Definitions
- This invention relates to a hydraulic pit prop of the type having a crank-operated internal pump and releasevalve and, more particularly, where the crank mechanism has a pump handle which requires one arcuate movement for operating the pump and a second arcuate movement for operating the release valve.
- An object of the invention is to provide the prop with improved air valve means whereby the prop is able to operate etciently for a long period.
- FIG. l is a general sectional view of a hydraulic pit prop equipped with air valve means according to the invention.
- FIG. 2 is a side sectional view in enlarged scale of an upper part of the prop showing the air valve means
- FIG. 3 is a eros-sectional view through the air valve means with the valve parts in the position they adopt during pumping up of the prop;
- FIG. 4 is a similar view to FIG. 2 showing a pump handle tted and the valve parts in the position they adopt during tluid valve release contraction of the prop;
- FIG. is a view similar to FIG. 3 but with the valve parts in the position of FIG. 4.
- the hydraulic prop shown is of the type referred to having an internal pump 1 and release valve 2 which are operable by a crank mechanism indicated generally 3.
- the crank 3 includes a crank axle 4 which, at its outwardly-projecting end (see FlG. 2), is formed with a transverse hole 4a for insertion of a pump handle 5 (FIGS. 3-5).
- the pump handle 5 goes through a predetermined arc of movement to operate the pump 1 and a second arc of movement to operate the release valve 2.
- the prop comprises a lower pressure cylinder 6 and an upper, reservoir-forming, hollow ram 7.
- the pump 1 is housed in the lower end of the ram 7 and has an associated check valve 8 through which fluid can be pumped from the ram 7 into the cylinder 6.
- the pump piston 1a is connected by a rod 9 to a crank 1i) secured to the crank axle 4.
- the release valve 2 is also housed in the lower end ot the ram 7 and is connected by a rod 11 to a projection 12 on the -rod 9 by means of a lost motion slot 11a.
- the crank axle 4 is connected by a collar 13 to the crank 10. Further, the axle 4 has a central bore 14 forming at its inner end an air chamber 15 open to the interior of the ram ⁇ 7.
- the bore 14 also has an intermediate reduced diameter bearing part 16 and an outer end further reduced diameter bearing part 17 open to the transverse hole 4a.
- crank axle 4 is mounted in a bearing sleeve 18 which is secured by welding to the ram 7.
- the intermediate reduced diameter bearing part 16 of the bore 14 provides a shoulder 16a against which sealing is effected by a sealing ring 26 on the plunger 23 behind the shoulder 23a.
- the plunger -23 is also formed with an annular air passage 27 substantially in the same general transverse or radial plane as that of the transverse air communication passage 22 and the outer air outlet 19.
- the pump handle 5 When the prop is in use, the pump handle 5 is fitted so that the plunger 23 is pressed in, as shown in FIG. 4. Thereupon, the sealing ring 26 becomes spaced from the shoulder 16a, and the annular air passage 27 provides communication between the transverse air communication passage 22 and the air chamber 15. However, at this stage, as illustrated in ysolid line in PIG. 3, the transverse air communication passage 22 does not register with the outer air outlet 19. Instead, as shown in FIG. 3, during the time that the pump handle 5 is operated in its ypredetermined -arc of movement to operate the pump 1, the
- transverse air communication passage 22 is carried around with the crank axle 4 through an arc of movement during which it is out of registry with the outer air outlet 19. This pumping action causes a comparatively small displacement of the uid and consequently ysmall displacement of air takes place by passage of air between the plunger 23 and the crank axle bore 14.
- the pump handle When it is required to contract the prop, the pump handle is moved through a second arc of movement during which it operates the release valve 2, and during this movement, as shown in FlG. 5, the handle 5 turns the crank axle 4 to a position in which the transverse air communication passage 22 registers with the outer air outlet 19. Therefore in this position of the parts, the comparatively large displacement of iluid is accompanied by similar large ⁇ displacement of air which is drawn into the prop.
- the air drawn into the'prop ows through the crank axle bore l14, the annular air passage 27, the transverse air communication passage 22, and the lregistering outer air outlet 19.
- the handle After contraction of the prop and it it is not required kfor immediate reuse, the handle is turned back to the initial pumping position where the transverse air com- 3 municationpassage 22 .is again moved out of registry with the outer air outlet 19, thereby preventing the possibility of foreign matter entering into the valve.
- a hydraulic jack comprising a cylinder, a reservoirproviding ram mounted in said cylinder, a pump and release valve mounted in said ram, passage means coupling said pump and ram, and second passage means coupling said ram and said reservoir, said release valve being positioned in said second passage means, a bearing sleeve fixed to and extending throughthe wall of said reservoir', a crankshaft journaled in said sleeve and having a crank portion within said reservoir coupled to said pump and release valve, said crankshaft having a portion outside said reservoir adapted to receive a pump handle, said shaft having an axial bore in the shaft portion intermediate the outside and crank portions thereof and communicating with said reservoir, said intermediate sha-ft portion being adapted to pass air from lsaid reservoir to the outside thereof, a seat in said bore, a slidevalve in said axial bore adapted to be engaged and unseated by said handle when said handle is received in said shaft outside portion, said intermediate shaft portion being equipped with a transverse passage communicating with said bore outward
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Details Of Reciprocating Pumps (AREA)
Description
April 27, 1965 F. TOWN HYDRAULIC PRoPs 3 Sheets-Sheet 1 Filed July 2. 1963 INV ENT OR Ffa/JK 75W 2 l., J nu n @MIM ATTORNEYS F. TOWN HYDRAULIC PROPS April 27, 1965 3 Sheets-Sheet 2 Filed July 2, 1963 BY W n/rm ATTORNEYS April 27, 1965 F. rowN HYDRAULIC PROPS v2' Sheets-Sheet 3 Filed July 2, 19625 A'ITORNEY5 United States Patent O HYDRAULIC PROPS Frank Town, Burton Joyce, England, assigner to W. E. & F. Dobson Limited Filed .luly 2, 1963, Ser. No. 292,274 Claims priority, application Great Britain, July 31, 1962,
This invention relates to a hydraulic pit prop of the type having a crank-operated internal pump and releasevalve and, more particularly, where the crank mechanism has a pump handle which requires one arcuate movement for operating the pump and a second arcuate movement for operating the release valve.
It is known to provide an air valve for supplying air during the extension of ythe prop by operation of the pump and releasing air during contraction of the prop by operation of the release valve. However, prior art air valves have not been entirely satisfactory, since they are subject to the entry of foreign matter, which reduces their eiliciency. This is especially true when the prop is laid downas when it is not in use.
An object of the invention is to provide the prop with improved air valve means whereby the prop is able to operate etciently for a long period.
Other objects and advantages of the invention may be seen in the description and operation of a specilic embodiment, which is described with reference to the accompanying drawings, in which- FIG. l is a general sectional view of a hydraulic pit prop equipped with air valve means according to the invention;
FIG. 2 is a side sectional view in enlarged scale of an upper part of the prop showing the air valve means;
FIG. 3 is a eros-sectional view through the air valve means with the valve parts in the position they adopt during pumping up of the prop;
FIG. 4 is a similar view to FIG. 2 showing a pump handle tted and the valve parts in the position they adopt during tluid valve release contraction of the prop; and
FIG. is a view similar to FIG. 3 but with the valve parts in the position of FIG. 4.
Referring to FG. 1, the hydraulic prop shown is of the type referred to having an internal pump 1 and release valve 2 which are operable by a crank mechanism indicated generally 3. The crank 3 includes a crank axle 4 which, at its outwardly-projecting end (see FlG. 2), is formed with a transverse hole 4a for insertion of a pump handle 5 (FIGS. 3-5). The pump handle 5 goes through a predetermined arc of movement to operate the pump 1 and a second arc of movement to operate the release valve 2.
More specically, the prop comprises a lower pressure cylinder 6 and an upper, reservoir-forming, hollow ram 7. The pump 1 is housed in the lower end of the ram 7 and has an associated check valve 8 through which fluid can be pumped from the ram 7 into the cylinder 6. The pump piston 1a is connected by a rod 9 to a crank 1i) secured to the crank axle 4.
The release valve 2 is also housed in the lower end ot the ram 7 and is connected by a rod 11 to a projection 12 on the -rod 9 by means of a lost motion slot 11a.
As shown in FIG. 2, the crank axle 4 is connected by a collar 13 to the crank 10. Further, the axle 4 has a central bore 14 forming at its inner end an air chamber 15 open to the interior of the ram` 7. The bore 14 also has an intermediate reduced diameter bearing part 16 and an outer end further reduced diameter bearing part 17 open to the transverse hole 4a.
The crank axle 4 is mounted in a bearing sleeve 18 which is secured by welding to the ram 7. The sleeve 1@ ICC Patented Apr. 27, 1965 pin across the bore 14, to partly project into the transverse hole 4a.
The intermediate reduced diameter bearing part 16 of the bore 14 provides a shoulder 16a against which sealing is effected by a sealing ring 26 on the plunger 23 behind the shoulder 23a.
The plunger -23 is also formed with an annular air passage 27 substantially in the same general transverse or radial plane as that of the transverse air communication passage 22 and the outer air outlet 19.
When the prop is not in use, the crank axle 4 and air valve parts are as shown in FIG. 2, i.e., before the pump handle is tted, so that the plunger 23 partly projects into the transverse hole 4a, the sealing ring 26 seals against the shoulder 16a, and the outer air outlet 19 is cut oir" from the annular air passage 27.` With the parts in vthis position, there is little or no possibility of 4foreign matter passing from the outer air outlet 19 into the in-terior of the valve. Even when the prop is laid on the ground, the outer air outlet 19 is guarded to `some extent by the enlarged part 4b of the crank axle 4, and should foreign matter enter the outer air outlet'19, it cannot pass into the interior of the valve. Further, dirt can be readily cleared out of the outer air .outlet 19 before the prop is p-ut into use. By this means the air valve has a desirably long and efficient working life. Y
Operation When the prop is in use, the pump handle 5 is fitted so that the plunger 23 is pressed in, as shown in FIG. 4. Thereupon, the sealing ring 26 becomes spaced from the shoulder 16a, and the annular air passage 27 provides communication between the transverse air communication passage 22 and the air chamber 15. However, at this stage, as illustrated in ysolid line in PIG. 3, the transverse air communication passage 22 does not register with the outer air outlet 19. Instead, as shown in FIG. 3, during the time that the pump handle 5 is operated in its ypredetermined -arc of movement to operate the pump 1, the
transverse air communication passage 22 is carried around with the crank axle 4 through an arc of movement during which it is out of registry with the outer air outlet 19. This pumping action causes a comparatively small displacement of the uid and consequently ysmall displacement of air takes place by passage of air between the plunger 23 and the crank axle bore 14.
When it is required to contract the prop, the pump handle is moved through a second arc of movement during which it operates the release valve 2, and during this movement, as shown in FlG. 5, the handle 5 turns the crank axle 4 to a position in which the transverse air communication passage 22 registers with the outer air outlet 19. Therefore in this position of the parts, the comparatively large displacement of iluid is accompanied by similar large `displacement of air which is drawn into the prop. The air drawn into the'prop ows through the crank axle bore l14, the annular air passage 27, the transverse air communication passage 22, and the lregistering outer air outlet 19.
After contraction of the prop and it it is not required kfor immediate reuse, the handle is turned back to the initial pumping position where the transverse air com- 3 municationpassage 22 .is again moved out of registry with the outer air outlet 19, thereby preventing the possibility of foreign matter entering into the valve.
What I claim is:
l. A hydraulic jack, comprising a cylinder, a reservoirproviding ram mounted in said cylinder, a pump and release valve mounted in said ram, passage means coupling said pump and ram, and second passage means coupling said ram and said reservoir, said release valve being positioned in said second passage means, a bearing sleeve fixed to and extending throughthe wall of said reservoir', a crankshaft journaled in said sleeve and having a crank portion within said reservoir coupled to said pump and release valve, said crankshaft having a portion outside said reservoir adapted to receive a pump handle, said shaft having an axial bore in the shaft portion intermediate the outside and crank portions thereof and communicating with said reservoir, said intermediate sha-ft portion being adapted to pass air from lsaid reservoir to the outside thereof, a seat in said bore, a slidevalve in said axial bore adapted to be engaged and unseated by said handle when said handle is received in said shaft outside portion, said intermediate shaft portion being equipped with a transverse passage communicating with said bore outward of the seat of said slide valve, said sleeve being equipped with a transverse passage located so as to align with said shaft transverse passage only during the release valve opening position of said shaft. Y Y
2. The structure of claim l in which. said shaft outside portion is equipped with an integral annular enlargement projecting radially beyond said sleeveitransverse passage whereby said sleeve transverse passage is protected against entry of dirt.
meegaan 3. A hydraulic jack, c-omprising a cylinder, a reservoirproviding ram mounted in said cylinder, a pump and release valve mounted in said ram, passage means coupling said pump and ram, and second passage means coupling said ram and said reservoir, said release valve being positioned in said `second passage means, a crankequipped shaft rotatably mounted in said reservoir and projecting exteriorly thereof, -said crank including means for coupling said shaft to said pump and release valve to actuate said pump during a predetermined arc of rotation of said shaft and thereafter operate said release valve upon further shaft rotation, said shaft being equipped with a bore extending generally axially at least partway therethrough and communicating with said reservoir, slide valve means in said bore, said shaft, in the portion thereof projecting exteriorly of said reservoir, being equipped with a handle-receiving slot, said slot and slide valve means being so arranged tha-t insertion of a handle in said slot actuates said slide valve means, and rotary valve means opera-bly associated with said shaft and so arranged therewith that movement of said shaft for actuating said .release valve also actuates said rotary valve means.
References Cited by the Examiner UNITED STATES PATENTS 686,133 11/01 Yost Z22- 385 1,212,757 l/l7 Freese 60-52 1,344,919 6/20 Marr 60--52 3,055,626 9/62 Tebb et al 60-52 X Y JULIUS E. WEST, Primary Examiner.'
Claims (1)
1. A HYDRAULIC JACK, COMPRISING A CYLINDER, A RESERVOIRPROVIDING RAM MOUNTED IN SAID CYLINDER, A PUMP AND RELEASE VALVE MOUNTED IN SAID RAM, PASSAGE MEANS COUPLING SAID PUMP AND RAM, AND SECOND PASSAGE MEANS COUPLING SAID RAM AND SAID RESERVOIR, SAID RELEASE VALVE BEING POSITIONED IN SAID SECOND PASSAGE MEANS, A BEARING SLEEVE FIXED TO AND EXTENDING THROUGH THE WALL OF SAID RESERVOIR, A CRANKSHAFT JOURNALED IN SAID SLEEVE AND HAVING A CRANK PORTION WITHIN SAID RESERVOIR COUPLED TO SAID PUMP AND RELEASE VALVE, SAID CRANKSHAFT HAVING A PORTION OUTSIDE SAID RESERVOIR ADAPTED TO RECEIVE A PUMP HANDLE, SAID SHAFT HAVING AN AXIAL BORE IN THE SHAFT PORTION INTERMEDIATE THE OUTSIDE AND CRANK PORTIONS THEREOF AND COMMUNCATING WITH SAID RESERVOIR, SAID INTERMEDIATE SHAFT PORTION BEING ADAPTED TO PASS AIR FROM SAID RESERVOIR TO THE OUTSIDE THEREOF, A SEAT IN SAID BORE, A SLIDE VALVE IN SAID AXIAL BORE ADAPTED TO BE ENGAGED AND UNSEATED BY SAID HANDLE WHEN SAID HANDLE IS RECEIVED IN SAID SHAFT OUTSIDE PORTION, SAID INTERMEDIATE SHAFT PORTION BEING EQUIPPED WITH A TRANSVERSE PASSAGE COMMUNICATING WITH SAID BORE OUTWARD OF THE SEAT OF SAID SLIDE VALVE, SAID SLEEVE BEING EQUIPPED WITH A TRANSVERSE PASSAGE LOCATED SO AS TO ALIGN WITH SAID SHAFT TRANSVERSE PASSAGE ONLY DURING THE RELEASE VALVE OPENING POSITION OF SAID SHAFT.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB29288/62A GB1030574A (en) | 1962-07-31 | 1962-07-31 | Improvements in or relating to hydraulic props |
Publications (1)
Publication Number | Publication Date |
---|---|
US3180093A true US3180093A (en) | 1965-04-27 |
Family
ID=10289161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US292274A Expired - Lifetime US3180093A (en) | 1962-07-31 | 1963-07-02 | Hydraulic props |
Country Status (4)
Country | Link |
---|---|
US (1) | US3180093A (en) |
BE (1) | BE634933A (en) |
GB (1) | GB1030574A (en) |
NL (1) | NL295875A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3302529A (en) * | 1964-01-18 | 1967-02-07 | Dobson Ltd W E & F | Hydraulic mine roof supports |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US686183A (en) * | 1899-05-22 | 1901-11-05 | Jay W Watkins | Fire-extinguisher. |
US1212757A (en) * | 1914-11-05 | 1917-01-16 | Carl A Waldron | Hydraulic jack. |
US1344919A (en) * | 1919-05-05 | 1920-06-29 | Alexander W Marr | Hydraulic jack |
US3055626A (en) * | 1960-04-09 | 1962-09-25 | Mastabar Mining Equip Co Ltd | Hydraulic supports |
-
0
- NL NL295875D patent/NL295875A/xx unknown
- BE BE634933D patent/BE634933A/xx unknown
-
1962
- 1962-07-31 GB GB29288/62A patent/GB1030574A/en not_active Expired
-
1963
- 1963-07-02 US US292274A patent/US3180093A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US686183A (en) * | 1899-05-22 | 1901-11-05 | Jay W Watkins | Fire-extinguisher. |
US1212757A (en) * | 1914-11-05 | 1917-01-16 | Carl A Waldron | Hydraulic jack. |
US1344919A (en) * | 1919-05-05 | 1920-06-29 | Alexander W Marr | Hydraulic jack |
US3055626A (en) * | 1960-04-09 | 1962-09-25 | Mastabar Mining Equip Co Ltd | Hydraulic supports |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3302529A (en) * | 1964-01-18 | 1967-02-07 | Dobson Ltd W E & F | Hydraulic mine roof supports |
Also Published As
Publication number | Publication date |
---|---|
GB1030574A (en) | 1966-05-25 |
BE634933A (en) | |
NL295875A (en) |
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