CA2419758C - Ventilation valve of hydraulic jack - Google Patents
Ventilation valve of hydraulic jack Download PDFInfo
- Publication number
- CA2419758C CA2419758C CA 2419758 CA2419758A CA2419758C CA 2419758 C CA2419758 C CA 2419758C CA 2419758 CA2419758 CA 2419758 CA 2419758 A CA2419758 A CA 2419758A CA 2419758 C CA2419758 C CA 2419758C
- Authority
- CA
- Canada
- Prior art keywords
- valve
- oil
- storage tank
- jack
- oil storage
- 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
- 238000009423 ventilation Methods 0.000 title claims abstract description 24
- 229920002457 flexible plastic Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F5/00—Mobile jacks of the garage type mounted on wheels or rollers
- B66F5/04—Mobile jacks of the garage type mounted on wheels or rollers with fluid-pressure-operated lifting gear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7869—Biased open
- Y10T137/7871—Weight biased
- Y10T137/7873—Ball valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Check Valves (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
- Types And Forms Of Lifts (AREA)
Abstract
A ventilation valve of a hydraulic jack is dedicated to be mounted at an outer wall of an oil storage tank of a hydraulic jack. The hydraulic jack includes a valve seat, a valve ball, and a cap. When the jack is not operated, a valve hole is opened; the vent of the cap is communicated with the oil storage tank of the jack so as to maintain the equilibrium of the pressure of the oil storage tank; thereby the piston of the pump can suck oil successfully so that the oil is absorbed into the oii chamber of the pump to be saturated therein. At the moment that the valve ball ejects upwards rapidly. the oil buffer chamber can buffer high pressure draining oil until the oil return operation of the jack is accomplished.
Description
VENTILATION VALVE OF HYDRAULIC JACK
(a) Field of the Invention The present invention relates to ventilation valves, and particularly to a ventilation valve of a hydraulic jack, wherein when the jack is not operated, a valve hole is opened; the vent of a cap of the jack is communicated with the oil storage tank of the jack so as to maintain the equilibrium of the pressure of the oil storage tank; thereby the piston of the pump can suck oil successfully so that the oil is drawn into the oil chamber of the pump to fill said oil chamber completely.
(b) Description of the Prior Art:
In the lifting process of a prior art jack, a piston of a pump draws oil from an oil storage tank into an oil chamber of a pump. Then oil is transferred into an inner oil tank. By the reciprocal operation of above process, the jack can lift upwards gradually. In the prior art design, the oil storage tank of a hydraulic jack is sealed completely. When the pump operates initially, the oil in the oil storage tank passes through the oil chamber of the pump and enters into the inner oil tank. The oil storage will reduce gradually. The less the oil storage, the smaller the pressure of the oil storage tank. As a result, the pressure will approach to a vacuum pressure. Thereby, the pumping operation becomes difficult so that the piston can draw oil successfully. Moreover, the oil cannot perform a complete filling. Thus, in each lifting process, a maximum efficiency can not be achieved.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a ventilation valve to be mounted at an outer wall of an oil storage tank of a hydraulic jack, the oil storage tank being connected to an oil chamber of a pump provided with a piston, the ventilation valve including:
a valve seat which is a hollow seat, the valve seat being locked to the outer wall of the oil storage tank of the hydraulic jack and connected to the oil storage tank;
a valve ball;
a valve body received in the valve seat, the valve body being a hollow body, the valve body having an upper end formed with a valve hole having the valve ball therein, the valve body having a lower end formed with a stopper for keeping the valve ball in position in the valve body, the valve ball being installed within the valve body for controlling a closure of the valve hole; and a cap tightly combined with another end of the valve body, a vent communicated with the atmosphere being formed at a predetermined position of the cap; when the jack is not operated, the valve hole is opened; the vent of the cap is connected to the oil storage tank of the jack so as to maintain a pressure equilibrium of the oil storage tank with atmospheric pressure thereby, when the jack is operated, the piston of the pump is capable of sucking oil so that the oil is drawn into the oil chamber filling the oil chamber completely.
Preferably, a further object of the present invention is to provide a ventilation valve of a hydraulic jack, wherein when the oil of the jack flows along a return path in the oil buffer chamber between the valve seat and the cap, the valve ball will close the valve hole of the valve body by the upward ejection of the valve ball since a large amount oil in the oil groove returns to the oil storage tank rapidly in a high pressure so as to prevent the oil from flushing out.
(a) Field of the Invention The present invention relates to ventilation valves, and particularly to a ventilation valve of a hydraulic jack, wherein when the jack is not operated, a valve hole is opened; the vent of a cap of the jack is communicated with the oil storage tank of the jack so as to maintain the equilibrium of the pressure of the oil storage tank; thereby the piston of the pump can suck oil successfully so that the oil is drawn into the oil chamber of the pump to fill said oil chamber completely.
(b) Description of the Prior Art:
In the lifting process of a prior art jack, a piston of a pump draws oil from an oil storage tank into an oil chamber of a pump. Then oil is transferred into an inner oil tank. By the reciprocal operation of above process, the jack can lift upwards gradually. In the prior art design, the oil storage tank of a hydraulic jack is sealed completely. When the pump operates initially, the oil in the oil storage tank passes through the oil chamber of the pump and enters into the inner oil tank. The oil storage will reduce gradually. The less the oil storage, the smaller the pressure of the oil storage tank. As a result, the pressure will approach to a vacuum pressure. Thereby, the pumping operation becomes difficult so that the piston can draw oil successfully. Moreover, the oil cannot perform a complete filling. Thus, in each lifting process, a maximum efficiency can not be achieved.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a ventilation valve to be mounted at an outer wall of an oil storage tank of a hydraulic jack, the oil storage tank being connected to an oil chamber of a pump provided with a piston, the ventilation valve including:
a valve seat which is a hollow seat, the valve seat being locked to the outer wall of the oil storage tank of the hydraulic jack and connected to the oil storage tank;
a valve ball;
a valve body received in the valve seat, the valve body being a hollow body, the valve body having an upper end formed with a valve hole having the valve ball therein, the valve body having a lower end formed with a stopper for keeping the valve ball in position in the valve body, the valve ball being installed within the valve body for controlling a closure of the valve hole; and a cap tightly combined with another end of the valve body, a vent communicated with the atmosphere being formed at a predetermined position of the cap; when the jack is not operated, the valve hole is opened; the vent of the cap is connected to the oil storage tank of the jack so as to maintain a pressure equilibrium of the oil storage tank with atmospheric pressure thereby, when the jack is operated, the piston of the pump is capable of sucking oil so that the oil is drawn into the oil chamber filling the oil chamber completely.
Preferably, a further object of the present invention is to provide a ventilation valve of a hydraulic jack, wherein when the oil of the jack flows along a return path in the oil buffer chamber between the valve seat and the cap, the valve ball will close the valve hole of the valve body by the upward ejection of the valve ball since a large amount oil in the oil groove returns to the oil storage tank rapidly in a high pressure so as to prevent the oil from flushing out.
Preferably, another object of the present invention is to provide a ventilation valve of a hydraulic jack, wherein at the moment that the valve ball ejects upwards rapidly, an oil buffer chamber can buffer high pressure draining oil until the oil return operation of 2a the ja'ck is accomplished after wholly descents. Since the pressure of the oil storage tank is reduced, the valve ball will fall down due to the gravitational effect so as to open the valve hole and as a result, the surplus gas is released. Thereby, the pressure of the oil storage tank of the jack is in equilibrium state with the atmosphere.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an assembled schematic view of the jack installecl. in the present invention.
Fig. 2 is an assembled perspective view of the present invention. 1 Fig. 3 is an exploded perspective view of the present invention.
Fig. 4 is an assembled cross section view showing the valve hole of the present invention being opened.
Fig. 5 is a schematic view showing a transient state in that the valve ball is ejected by oil according to the present invention.
Fig. 6 is a schematic view showing that the valve hole of the present invention is closed due to the ejection of oil.
DETAILED DESCRIP"ITON OFI'HE PI2EFERRED EMBODIMENTS
Referring to Figs. 1 and 3, the ventilation valve of a hydraulic jack of the present invention is iliustrated. The ventilation valve of a hydraulic jack is dedicated to be used at an outer wall of an oil storage tank 101 of a hydraulic jack 10. The hydraulic jack 10 includes a valve seat 1, valve ball 3, a cap 4, etc.
The valve seat 1 is a hollow seat and one end thereof has a threaded section 11, which is locked to an outer wall of an oil storage tank 101 of a hydraulic jack 10 and is communicated to the oil storage tank 101. An 0 ring serves to seal the connection portion of the valve seat 1 and the oil storage tank 101. An interior of the valve seat 1 can receive a valve body 2. An upper end of the valve body 2 is installed with a buckling ring 13. An upper section of the valve seat 1 is extended with an oil buffer chamber 14 for storing oil temporarily.
The valve body 2 is a hollow body and is received in the valve seat 1. An upper end of the valve body 2 is formed with a valve hole 21 having a valve ball 3 therein. A lower end of the valve body 2 is formed with a stopping pin 22 or a proper stopper for keeping the valve ball 3 in position in the valve body. An outer wall of the valve body 2 has an annular groove 23 for embedding an oil seal 24.
The valve ball 3 is installed within the valve body 2. By the raising and descending of the valve ball 3, the valve hole 21 of the valve body 2 is controlled to be closed (referring to Fig. 6) or to be opened (referring to Fig. 4).
The cap 4 can be made of flexible plastic and an inner wall of the cap 4 has an annular rib 41 (referring to Fig. 4), thereby, the cap 4 can be combined with another end of the valve seat 2. A vent 42 communicated with outer space is formed at a predetermined position of the cap 4. An upper end of the cap is formed with a protruded piece 43 for holding the cap.
The ventilation valve made of above components will be installed to the outer wall of the oil storage tank 101 of the hydraulic jack 10. When the hydraulic jack 10 is not operated, the valve ball 3 of the ventilation valve will fall down due to gravitational effect (referring to Fig. 4), the valve hole 21 will be opened. Then the vent 42 of the cap 4 will be communicated with the oil storage tank 101 of the jack 10. The pressure in the oil storage tank 101 is in equilibrium with the atmosphere. Then the atmosphere is larger than the pressure of the oil chamber in the pump. By this pressure difference, the piston 20 of the pump will draw oil successfully so that oil is drawn into the oil chamber 201 of the pump 20 so as to completely fill said oil chamber. Thereby, each time the jack 10 is raised, it can be operated with an optimum effect.
'Ilen tlle oil of ttle jack 10 f1oxvs along a return path, in thr oil buffer chamber 14 betxveen the N-alx=e seat 2 and tile cap 4. tlle valve ball 3Nvill close tile valve hole 21 of the valve body 2 by the upxvarcl ejection of tlle valve ball 3 slllcc; a lar_ge amount oil in lllc oil groove 102 returns to the oil storaoe tank 101 1-apidly in a Iliih rressure (referrinà to FiL,,. 6) so as to prevent the oil fronl flushin'~
out. At the nlonlent that the valve ball 3 ejects upxvards rapicflN.
the oil btiffer chamber 14 can bttffer high pressure ci--ainiil", oil until the oil return operation ofthe _jack 10 is accoinplishc.l aftcr \~hollv descents. SitIce thc I)ressure oCthe oil stor,lge tanl: 101 is rCduced, the valve ball 3will fall clo\vn due to the gra~ itational effect so as to ollen the valve hole 21 so as to release the surplus as. Tilereby, the pressure of the oil storage tank 1 01 of the jack 10 is in equilibrium With the atmosphere. Next tinle as the jack 10 raises, the oil left in the oil buffcr chambei- 14 ~\ill be drawn into the oil storaoe tank 101 hV the Vacuum effect of the chanlher.
Ttle present lilN'C1It10Il ]S thllS ClescrlbeCf, it ~vill be ob\ ious tllat the sanle nlav he varieci in nlanN \ti'ays. Stlcll variations are not to be regarded as a deliarture froni the spirit and scope of the present in% ention. and all such modifications as NN-ould he obvious to one skilled in the art are intendecl to he ineluded %vithin the scolie of-the follo~% ing claims.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an assembled schematic view of the jack installecl. in the present invention.
Fig. 2 is an assembled perspective view of the present invention. 1 Fig. 3 is an exploded perspective view of the present invention.
Fig. 4 is an assembled cross section view showing the valve hole of the present invention being opened.
Fig. 5 is a schematic view showing a transient state in that the valve ball is ejected by oil according to the present invention.
Fig. 6 is a schematic view showing that the valve hole of the present invention is closed due to the ejection of oil.
DETAILED DESCRIP"ITON OFI'HE PI2EFERRED EMBODIMENTS
Referring to Figs. 1 and 3, the ventilation valve of a hydraulic jack of the present invention is iliustrated. The ventilation valve of a hydraulic jack is dedicated to be used at an outer wall of an oil storage tank 101 of a hydraulic jack 10. The hydraulic jack 10 includes a valve seat 1, valve ball 3, a cap 4, etc.
The valve seat 1 is a hollow seat and one end thereof has a threaded section 11, which is locked to an outer wall of an oil storage tank 101 of a hydraulic jack 10 and is communicated to the oil storage tank 101. An 0 ring serves to seal the connection portion of the valve seat 1 and the oil storage tank 101. An interior of the valve seat 1 can receive a valve body 2. An upper end of the valve body 2 is installed with a buckling ring 13. An upper section of the valve seat 1 is extended with an oil buffer chamber 14 for storing oil temporarily.
The valve body 2 is a hollow body and is received in the valve seat 1. An upper end of the valve body 2 is formed with a valve hole 21 having a valve ball 3 therein. A lower end of the valve body 2 is formed with a stopping pin 22 or a proper stopper for keeping the valve ball 3 in position in the valve body. An outer wall of the valve body 2 has an annular groove 23 for embedding an oil seal 24.
The valve ball 3 is installed within the valve body 2. By the raising and descending of the valve ball 3, the valve hole 21 of the valve body 2 is controlled to be closed (referring to Fig. 6) or to be opened (referring to Fig. 4).
The cap 4 can be made of flexible plastic and an inner wall of the cap 4 has an annular rib 41 (referring to Fig. 4), thereby, the cap 4 can be combined with another end of the valve seat 2. A vent 42 communicated with outer space is formed at a predetermined position of the cap 4. An upper end of the cap is formed with a protruded piece 43 for holding the cap.
The ventilation valve made of above components will be installed to the outer wall of the oil storage tank 101 of the hydraulic jack 10. When the hydraulic jack 10 is not operated, the valve ball 3 of the ventilation valve will fall down due to gravitational effect (referring to Fig. 4), the valve hole 21 will be opened. Then the vent 42 of the cap 4 will be communicated with the oil storage tank 101 of the jack 10. The pressure in the oil storage tank 101 is in equilibrium with the atmosphere. Then the atmosphere is larger than the pressure of the oil chamber in the pump. By this pressure difference, the piston 20 of the pump will draw oil successfully so that oil is drawn into the oil chamber 201 of the pump 20 so as to completely fill said oil chamber. Thereby, each time the jack 10 is raised, it can be operated with an optimum effect.
'Ilen tlle oil of ttle jack 10 f1oxvs along a return path, in thr oil buffer chamber 14 betxveen the N-alx=e seat 2 and tile cap 4. tlle valve ball 3Nvill close tile valve hole 21 of the valve body 2 by the upxvarcl ejection of tlle valve ball 3 slllcc; a lar_ge amount oil in lllc oil groove 102 returns to the oil storaoe tank 101 1-apidly in a Iliih rressure (referrinà to FiL,,. 6) so as to prevent the oil fronl flushin'~
out. At the nlonlent that the valve ball 3 ejects upxvards rapicflN.
the oil btiffer chamber 14 can bttffer high pressure ci--ainiil", oil until the oil return operation ofthe _jack 10 is accoinplishc.l aftcr \~hollv descents. SitIce thc I)ressure oCthe oil stor,lge tanl: 101 is rCduced, the valve ball 3will fall clo\vn due to the gra~ itational effect so as to ollen the valve hole 21 so as to release the surplus as. Tilereby, the pressure of the oil storage tank 1 01 of the jack 10 is in equilibrium With the atmosphere. Next tinle as the jack 10 raises, the oil left in the oil buffcr chambei- 14 ~\ill be drawn into the oil storaoe tank 101 hV the Vacuum effect of the chanlher.
Ttle present lilN'C1It10Il ]S thllS ClescrlbeCf, it ~vill be ob\ ious tllat the sanle nlav he varieci in nlanN \ti'ays. Stlcll variations are not to be regarded as a deliarture froni the spirit and scope of the present in% ention. and all such modifications as NN-ould he obvious to one skilled in the art are intendecl to he ineluded %vithin the scolie of-the follo~% ing claims.
Claims (10)
1. A ventilation valve to be mounted at an outer wall of an oil storage tank of a hydraulic jack, the oil storage tank being connected to an oil chamber of a pump provided with a piston, the ventilation valve including:
a valve seat which is a hollow seat, the valve seat being locked to the outer wall of the oil storage tank of the hydraulic jack and connected to the oil storage tank;
a valve ball;
a valve body received in the valve seat, the valve body being a hollow body, the valve body having an upper end formed with a valve hole having the valve ball therein, the valve body having a lower end formed with a stopper for keeping the valve ball in position in the valve body, the valve ball being installed within the valve body for controlling a closure of the valve hole; and a cap tightly combined with another end of the valve body, a vent communicated with the atmosphere being formed at a predetermined position of the cap; when the jack is not operated, the valve hole is opened; the vent of the cap is connected to the oil storage tank of the jack so as to maintain a pressure equilibrium of the oil storage tank with atmospheric pressure thereby, when the jack is operated, the piston of the pump is capable of sucking oil so that the oil is drawn into the oil chamber filling the oil chamber completely.
a valve seat which is a hollow seat, the valve seat being locked to the outer wall of the oil storage tank of the hydraulic jack and connected to the oil storage tank;
a valve ball;
a valve body received in the valve seat, the valve body being a hollow body, the valve body having an upper end formed with a valve hole having the valve ball therein, the valve body having a lower end formed with a stopper for keeping the valve ball in position in the valve body, the valve ball being installed within the valve body for controlling a closure of the valve hole; and a cap tightly combined with another end of the valve body, a vent communicated with the atmosphere being formed at a predetermined position of the cap; when the jack is not operated, the valve hole is opened; the vent of the cap is connected to the oil storage tank of the jack so as to maintain a pressure equilibrium of the oil storage tank with atmospheric pressure thereby, when the jack is operated, the piston of the pump is capable of sucking oil so that the oil is drawn into the oil chamber filling the oil chamber completely.
2. The ventilation valve according to claim 1, wherein the end of the valve seat locked to the outer wall of the oil storage tank of the jack has a threaded section.
3. The ventilation valve according to claim 1, wherein an O ring serves to seal a connection portion of the valve seat and the oil storage tank.
4. The ventilation valve according to claim 1, wherein the upper end of the valve body is installed with a buckling ring.
5. The ventilation valve according to claim 1, wherein an upper section of the valve seat is extended with an oil buffer chamber for storing oil.
6. The ventilation valve according to claim 1, wherein the stopper at the lower end of the valve body is a stopping pin.
7. The ventilation valve according to claim 1, wherein an outer wall of the valve body has an annular groove for embedding an oil seal.
8. The ventilation valve according to claim 1, wherein an inner wall of the cap has an annular rib cooperating with an outer wall of the valve seat.
9. The ventilation valve according to claim 1, wherein an upper end of the valve body is formed with a protruded piece for holding the cap.
10. The ventilation valve according to claim 1, wherein the cap is made of flexible plastic material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2419758 CA2419758C (en) | 2003-02-25 | 2003-02-25 | Ventilation valve of hydraulic jack |
| US10/377,796 US7194857B2 (en) | 2003-02-25 | 2003-03-04 | Ventilation valve of hydraulic jack |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2419758 CA2419758C (en) | 2003-02-25 | 2003-02-25 | Ventilation valve of hydraulic jack |
| US10/377,796 US7194857B2 (en) | 2003-02-25 | 2003-03-04 | Ventilation valve of hydraulic jack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2419758A1 CA2419758A1 (en) | 2004-08-25 |
| CA2419758C true CA2419758C (en) | 2008-01-15 |
Family
ID=33435800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2419758 Expired - Lifetime CA2419758C (en) | 2003-02-25 | 2003-02-25 | Ventilation valve of hydraulic jack |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US7194857B2 (en) |
| CA (1) | CA2419758C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060083635A1 (en) * | 2004-10-20 | 2006-04-20 | Shinn Fu Corporation | Air bladder type vent valve for use in an hydraulic oil tank of an enclosed hydraulic transmission system |
| US8172255B1 (en) * | 2008-11-07 | 2012-05-08 | Rebecca Martin | Height-adjustable kitchen cart |
| CN102718170B (en) * | 2012-06-01 | 2014-04-02 | 常熟通润汽车零部件股份有限公司 | Self-return oil drain valve of hydraulic jack |
| US10542731B2 (en) | 2012-06-27 | 2020-01-28 | Ctb, Inc. | Breather cap assembly |
| US8904962B2 (en) | 2012-06-27 | 2014-12-09 | Ctb, Inc. | Breather cap assembly |
| USD708402S1 (en) | 2012-06-27 | 2014-07-01 | Ctb, Inc. | Breather cap for use in connection with a watering assembly |
| CN104454726B (en) * | 2014-11-28 | 2017-01-18 | 富阳九力机械制造有限公司 | Hydraulic valve with oil returning path with self-locking function |
| CN204607490U (en) * | 2015-03-04 | 2015-09-02 | 杭州盈江机械制造有限公司 | The hydraulic jack of load fast lifting |
| CN106545529B (en) | 2016-12-22 | 2018-10-09 | 杭州天恒机械有限公司 | Can adjust automatically oil cylinder internal pressure hydraulic jack dynamical system |
| CN112392801A (en) * | 2019-08-02 | 2021-02-23 | 上海梅山钢铁股份有限公司 | Device for preventing oil from being bundled by hydraulic system |
| TWI714333B (en) | 2019-11-04 | 2020-12-21 | 信孚產業股份有限公司 | Oil return valve group with multi-stage throttling control |
| CN118188640A (en) * | 2024-04-16 | 2024-06-14 | 合肥大学 | Multifunctional single-piston oil cylinder for high-efficiency pressing control of press |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1656430A (en) * | 1926-03-16 | 1928-01-17 | Herman D Eberle | Hydraulic jack |
| US3113587A (en) * | 1961-06-09 | 1963-12-10 | Lloyd A Hendley | Ball check valve seat assembly |
| US4945947A (en) * | 1989-05-26 | 1990-08-07 | Chromalloy American Corporation | Ball-type check valve |
| US5465576A (en) * | 1994-01-24 | 1995-11-14 | Applied Power Inc. | Vented hydraulic fluid reservoir |
| DE19944124C1 (en) * | 1999-09-15 | 2001-05-23 | Eurocopter Deutschland | Vent valve with ventilation duct for a tank container of a helicopter |
-
2003
- 2003-02-25 CA CA 2419758 patent/CA2419758C/en not_active Expired - Lifetime
- 2003-03-04 US US10/377,796 patent/US7194857B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US20040172938A1 (en) | 2004-09-09 |
| US7194857B2 (en) | 2007-03-27 |
| CA2419758A1 (en) | 2004-08-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20230227 |