CA1176185A - Hydraulic elevators - Google Patents
Hydraulic elevatorsInfo
- Publication number
- CA1176185A CA1176185A CA000404641A CA404641A CA1176185A CA 1176185 A CA1176185 A CA 1176185A CA 000404641 A CA000404641 A CA 000404641A CA 404641 A CA404641 A CA 404641A CA 1176185 A CA1176185 A CA 1176185A
- Authority
- CA
- Canada
- Prior art keywords
- cab
- jack
- overhead
- elevator installation
- plunger
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
- B66B9/04—Kinds or types of lifts in, or associated with, buildings or other structures actuated pneumatically or hydraulically
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Structural Engineering (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
- Types And Forms Of Lifts (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An hydraulic elevator installation includes an elevator cab having an overhead frame member capable of supporting the weight of the cab. An hydraulic jack, optionally a telescoping cylinder jack, the cylinder of which is mounted in the hoistway,extends upwardly through the car. The plunger of the jack is coupled to the overhead frame member such that the plunger carries the overhead frame member and thereby the weight of the car. Preferably, the jack is disposed in the door return column located in the forward portion of the cab near the center of gravity of the cab.
An hydraulic elevator installation includes an elevator cab having an overhead frame member capable of supporting the weight of the cab. An hydraulic jack, optionally a telescoping cylinder jack, the cylinder of which is mounted in the hoistway,extends upwardly through the car. The plunger of the jack is coupled to the overhead frame member such that the plunger carries the overhead frame member and thereby the weight of the car. Preferably, the jack is disposed in the door return column located in the forward portion of the cab near the center of gravity of the cab.
Description
~ 1176185 SPEC,IFICATION
BACKGROUND OF THE INVENTION
The present invention relates to an improved hydraulic elevator construction.
In conventional hydraulic elevator svstems, an hydraulic jack is centrally located in the hoistway, and the plunger of the jack is attached to the bottom frame of the elevator cab to su?port the cab from below. The jack cylinder is sunk into the ground to a depth sufficient to permit the elevator cab to be lowered to ground (or basement) 13 floor level when the plun~er is fully retracted.
In this type of installation, the height of desired elevator cab travel determlnes the retracted length of the piston and cylinder combination, and thus determines the depth to which the cylinder must be sunk into the ground. ~ hole 1~ mus. ~e drilled in'_o the ~round to receive the cylinder in proper alisnment with the hoistway, and normallv a casing needs to be installed to line the hole, both of which are expensive operations. Moreover, deployment of the cylinder below ground itself creates problems, for example relating to corrosion, electrolysis, and inspection.
Corrosion of the cylinder may result in a sudden loss of fluid pressure in the cylinder, thereby rendering the elevator inoperable and necessitating extensive and costly repairs.
Several arrangements have been proposed to overcome the problem and expense of sinking an hydraulic cylinder into the ground. In one type of arrangement, the upper portion of the car frame is extended to one side of the cab and a conventional or telescoping hydraulic cylinder, which may be above ground or, where longer lifting distances are required, partially sunk into the ground, is attached to the frame extension. This arrangement produces hish eccentric loads ~ith resultant structural and service demands.
In another arrangement, the car frame is extended to either side of the cab, and a pair of above-ground or partially sunken jack cylinders are arranged laterally to either side of the elevator cab. This arrangement is more expensive, takes longer to install, and increases service demands.
My prior U.S. patent No. 3,954,157 discloses a novel hydraulic elevator installation in which the depth of the hole required to receive the jack plunger and cylinder is reduced, as compared with conventional designs, by at least the ~eight of the elevator car. The jack plunger is fixed in the elevator hoistway, and the jack cylinder is disposed over the plunger. The jack cylinder extends up through the elevator cab in the door return column and forms part of the elevator cab lifting frame. With the jack in its fully retracted position, such that the cab is ground floor level, approximately 12 feet of jack - cylinder and plunger are disposed above ground in the door return column. As a result, as opposed to conven-tior,al designs where the entire jack is disposed below the cab, in many installations no jack hole is required, and in installations requiring a longer jacX stroke the hole depth is reduced by the length of jack disposed in the door return column.
In the construction disclosed in ~.S. patent No.
3,954,157, the jack extends up through the cab in the vicinity of the center of gravit~y. As opposed to side mounted, single cylinder arrangements such as described above, the cab may be supported with a reduced cantilever effect and thus avoids high eccentric structural 102ds.
6~8s single cylinder may therefore readily be employed, or if desired a pair of cylinders, one on each side attached simllar to the mounting disclosed in U.S. patent No.
3,954,157, may be used.
S SUMMARY OF TH~ INVENTION
The present invention is a novel hydraulic elevator construction in which, similar to the elevator shown and described in my U.S. patent No. 3,954,157, the cab may be supported by a single hydraulic jack disposed in the hoistway, the required depth of the hole for receiving the jack is reduced by at least the height of the elevator cab, and the jack may be centrally disposed relative to the center of gravity of the cab to reduce or eliminate eccentric loading.
More particularly, in the preferred embodiment of the invention an hydraulic elevator installation has a frame which includes at least one overhead frame member, for exarple a cross-beam, which is capable of carrying the weight of the car. An hydraulic jack has a cylinder which is fixedly mounted in a vertical position in the hoistway, and a plunger t~hich extends upwardly from the cylinder through the car to engage the overhead cross-beam, such that the cross-beam, znd thereby the elevator cab, is carried by the plunger. The bottom of the elevator caD is provided with an opening for receivins t;ee ?lunger anc also for receiving the cylinder when the jack is in the retracted position. Preferably, the ,zck is disposed in the ~oor return column of the elevator cab, but it may be disposed at other locations within the cab.
In the latter case, the cylinder and plunger unit are preferably enclosed within the elevator cab to protect passengers or objects from the relative motion between the stationary cylinder and the moving passenger compartment.
A telescoping cylinder unit may also readily be employed with the present invention, which can further reduce or eliminate the required hole depth for the jack.
Where the jack extends up through the forward portion of the cab, for example in the door return column, and the cab-supporting frame members are disposed near the front of the cab, the conventional elevator rail guides may readily be mounted on the frame, to either side of the cab, and will be disposed in the front portion of the hoistway.
The cooperating tracks are thus also positioned in the forward portion of the hoistway. This facilitates the utilization of the im?roved rail mounting system described in my prior U.S.
patent No. 4,948,358.
In an elevator construction in accordance with 2Q the present invention, standard or telescoping jacks may be mounted on the hoistway floor or, if necessary, below ground, using conventional upright installations. Common components such as bolsters, guide shoes, and pit eauipment, may be used such that s?ecialized inventory items are not required.
Also, a conventional elevator cab and frame may be empioyed, such that the frame may be broken down for shipping and hanaling in the field. As installed, in most cases the top of -:.e cvlinder is well above the level of the tank so a ci-ect return can be installed to handle leakage.
Thus, the invention does not re~uire the use of specialized structures, and is easy to install and maintain.
The hydraulic lift configuration eliminates totally or at least substantially reduces the eccentric loading by positioning the lifting point within the confines of the elevator cab. At the same time, the depth of the jack hole is reduced by approximately 12 feet in every installation, so that in some installations no hole is required at all, and by employing a telescoping cylinder ~ack the required hole depth may be reduced further.
For a better understanding of the invention, reference is made to the following detailed description of the preferred embodiments, taken in conjunction with the drawings accompanying the application.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a front view, partially in section, of an hydraulic elevator installation in accordance with the invention;
Figure 2 is a top view of the hydraulic elevator ccnstruction shown in Figure l;
Figure 3 is a sectional view, taken through lines 3-3 of Figure 1; and Figure 4 is a top sectional view of an alternative e~odl~.ent o~^ elevator construction in accordance with the presen. invention.
~176~85 DETAILED DESCRIPTION OF THE PREFERRED E~ODI~ENTS
In the embodiment shown in Figs. 1~3, the cab frame includes a pair of vertically arranged stile members 14 and 16, a pair of overhead cross-beams 18 and 20, and bolster members 22 and 24. The bolster members 22 and 24 support an elevator platform 12. The frame members 14, 16, 18, 20, 22 and 24 may also support sidewalls, a ceiling, and an elevator cab door (not shown in Figs. 1-3).
In the frame shown, each of the frame members 14-24 is a C-shaped structural beam bolted or welded together. Other types of frames, however, ~hich include an overhead frame member or members capable of carrying the weight of the cab, ma~ be utilized.
The elevator cab 10 is supported by an hydraulic 1~ jack in the form of a telescoping cylinder arrangement 26.
The telescoping cylinder 26 may be constructed in accordance with the disclosure in my U.S. patent No. 4,201,0~3; however, other constructions of telescoping cylinders, or conventional, non-telescoping jacks, may be used. The elevator platform 12 has an opening 28 therein large enoush to receive the outer-most cylinder 30 of the telescoping jack ~6. Cylinder 30 should be freely slidable in hole 28 in the longitudinal direction. Hole 28 may be sized to provide clearance between the platform 12 and cvlinder 30, or may engage cylinaer 30 to ?rovice freedom of longitudi!lal movement bu, a lateral bearing surface between the cab and cylinder.
The plunser 32 of the jack 26 extends up through the elevator cab and engages the cross-beams 18 and 20 to support the weight of the elevator. As shown, the plunger 32 is supported between the spaced beams 18 and 20 by a locating S crosshead 34 secured in a slot cut into the upper end of the plunger 32. However, other plunger-to-cab frame connections may be employed, for example connections similar to those used in inst211ations where the plunger 32 is attached to the bottom of the cab frame. Also, while the plunger 32 is shown as 10 coupled to the beams 18 and 20, the plunger may be attached to other overhead frame members capable of supporting the elevator cab.
In operation, when the elevator cab 10 is lowered to the ground Gr basement floor (i.e. the lowest floor), 1~ the plunger 32 is retracted into the telescoping cylinders 29 and 30 of the hydraulic jack 26. The elevator cab 10 slides down over the cylinder 30 of the jack 26, such that the cylinders 29 and 30 and the plunger 32 are disposed within the confines of the elevator cab 10. ~hen the elevator 20 cab rises, cylinder 30 remains stationary and the telescoping cylinder 29, the plunger 32 and the elevator cab rise. At the upper end of the plunger stroke, the elevator cab 10 is disposed above the outer cylinder 30, such that the cylinder 30 no longer is disposed within the hole 28. As sho~Y-n in ~iss.
BACKGROUND OF THE INVENTION
The present invention relates to an improved hydraulic elevator construction.
In conventional hydraulic elevator svstems, an hydraulic jack is centrally located in the hoistway, and the plunger of the jack is attached to the bottom frame of the elevator cab to su?port the cab from below. The jack cylinder is sunk into the ground to a depth sufficient to permit the elevator cab to be lowered to ground (or basement) 13 floor level when the plun~er is fully retracted.
In this type of installation, the height of desired elevator cab travel determlnes the retracted length of the piston and cylinder combination, and thus determines the depth to which the cylinder must be sunk into the ground. ~ hole 1~ mus. ~e drilled in'_o the ~round to receive the cylinder in proper alisnment with the hoistway, and normallv a casing needs to be installed to line the hole, both of which are expensive operations. Moreover, deployment of the cylinder below ground itself creates problems, for example relating to corrosion, electrolysis, and inspection.
Corrosion of the cylinder may result in a sudden loss of fluid pressure in the cylinder, thereby rendering the elevator inoperable and necessitating extensive and costly repairs.
Several arrangements have been proposed to overcome the problem and expense of sinking an hydraulic cylinder into the ground. In one type of arrangement, the upper portion of the car frame is extended to one side of the cab and a conventional or telescoping hydraulic cylinder, which may be above ground or, where longer lifting distances are required, partially sunk into the ground, is attached to the frame extension. This arrangement produces hish eccentric loads ~ith resultant structural and service demands.
In another arrangement, the car frame is extended to either side of the cab, and a pair of above-ground or partially sunken jack cylinders are arranged laterally to either side of the elevator cab. This arrangement is more expensive, takes longer to install, and increases service demands.
My prior U.S. patent No. 3,954,157 discloses a novel hydraulic elevator installation in which the depth of the hole required to receive the jack plunger and cylinder is reduced, as compared with conventional designs, by at least the ~eight of the elevator car. The jack plunger is fixed in the elevator hoistway, and the jack cylinder is disposed over the plunger. The jack cylinder extends up through the elevator cab in the door return column and forms part of the elevator cab lifting frame. With the jack in its fully retracted position, such that the cab is ground floor level, approximately 12 feet of jack - cylinder and plunger are disposed above ground in the door return column. As a result, as opposed to conven-tior,al designs where the entire jack is disposed below the cab, in many installations no jack hole is required, and in installations requiring a longer jacX stroke the hole depth is reduced by the length of jack disposed in the door return column.
In the construction disclosed in ~.S. patent No.
3,954,157, the jack extends up through the cab in the vicinity of the center of gravit~y. As opposed to side mounted, single cylinder arrangements such as described above, the cab may be supported with a reduced cantilever effect and thus avoids high eccentric structural 102ds.
6~8s single cylinder may therefore readily be employed, or if desired a pair of cylinders, one on each side attached simllar to the mounting disclosed in U.S. patent No.
3,954,157, may be used.
S SUMMARY OF TH~ INVENTION
The present invention is a novel hydraulic elevator construction in which, similar to the elevator shown and described in my U.S. patent No. 3,954,157, the cab may be supported by a single hydraulic jack disposed in the hoistway, the required depth of the hole for receiving the jack is reduced by at least the height of the elevator cab, and the jack may be centrally disposed relative to the center of gravity of the cab to reduce or eliminate eccentric loading.
More particularly, in the preferred embodiment of the invention an hydraulic elevator installation has a frame which includes at least one overhead frame member, for exarple a cross-beam, which is capable of carrying the weight of the car. An hydraulic jack has a cylinder which is fixedly mounted in a vertical position in the hoistway, and a plunger t~hich extends upwardly from the cylinder through the car to engage the overhead cross-beam, such that the cross-beam, znd thereby the elevator cab, is carried by the plunger. The bottom of the elevator caD is provided with an opening for receivins t;ee ?lunger anc also for receiving the cylinder when the jack is in the retracted position. Preferably, the ,zck is disposed in the ~oor return column of the elevator cab, but it may be disposed at other locations within the cab.
In the latter case, the cylinder and plunger unit are preferably enclosed within the elevator cab to protect passengers or objects from the relative motion between the stationary cylinder and the moving passenger compartment.
A telescoping cylinder unit may also readily be employed with the present invention, which can further reduce or eliminate the required hole depth for the jack.
Where the jack extends up through the forward portion of the cab, for example in the door return column, and the cab-supporting frame members are disposed near the front of the cab, the conventional elevator rail guides may readily be mounted on the frame, to either side of the cab, and will be disposed in the front portion of the hoistway.
The cooperating tracks are thus also positioned in the forward portion of the hoistway. This facilitates the utilization of the im?roved rail mounting system described in my prior U.S.
patent No. 4,948,358.
In an elevator construction in accordance with 2Q the present invention, standard or telescoping jacks may be mounted on the hoistway floor or, if necessary, below ground, using conventional upright installations. Common components such as bolsters, guide shoes, and pit eauipment, may be used such that s?ecialized inventory items are not required.
Also, a conventional elevator cab and frame may be empioyed, such that the frame may be broken down for shipping and hanaling in the field. As installed, in most cases the top of -:.e cvlinder is well above the level of the tank so a ci-ect return can be installed to handle leakage.
Thus, the invention does not re~uire the use of specialized structures, and is easy to install and maintain.
The hydraulic lift configuration eliminates totally or at least substantially reduces the eccentric loading by positioning the lifting point within the confines of the elevator cab. At the same time, the depth of the jack hole is reduced by approximately 12 feet in every installation, so that in some installations no hole is required at all, and by employing a telescoping cylinder ~ack the required hole depth may be reduced further.
For a better understanding of the invention, reference is made to the following detailed description of the preferred embodiments, taken in conjunction with the drawings accompanying the application.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a front view, partially in section, of an hydraulic elevator installation in accordance with the invention;
Figure 2 is a top view of the hydraulic elevator ccnstruction shown in Figure l;
Figure 3 is a sectional view, taken through lines 3-3 of Figure 1; and Figure 4 is a top sectional view of an alternative e~odl~.ent o~^ elevator construction in accordance with the presen. invention.
~176~85 DETAILED DESCRIPTION OF THE PREFERRED E~ODI~ENTS
In the embodiment shown in Figs. 1~3, the cab frame includes a pair of vertically arranged stile members 14 and 16, a pair of overhead cross-beams 18 and 20, and bolster members 22 and 24. The bolster members 22 and 24 support an elevator platform 12. The frame members 14, 16, 18, 20, 22 and 24 may also support sidewalls, a ceiling, and an elevator cab door (not shown in Figs. 1-3).
In the frame shown, each of the frame members 14-24 is a C-shaped structural beam bolted or welded together. Other types of frames, however, ~hich include an overhead frame member or members capable of carrying the weight of the cab, ma~ be utilized.
The elevator cab 10 is supported by an hydraulic 1~ jack in the form of a telescoping cylinder arrangement 26.
The telescoping cylinder 26 may be constructed in accordance with the disclosure in my U.S. patent No. 4,201,0~3; however, other constructions of telescoping cylinders, or conventional, non-telescoping jacks, may be used. The elevator platform 12 has an opening 28 therein large enoush to receive the outer-most cylinder 30 of the telescoping jack ~6. Cylinder 30 should be freely slidable in hole 28 in the longitudinal direction. Hole 28 may be sized to provide clearance between the platform 12 and cvlinder 30, or may engage cylinaer 30 to ?rovice freedom of longitudi!lal movement bu, a lateral bearing surface between the cab and cylinder.
The plunser 32 of the jack 26 extends up through the elevator cab and engages the cross-beams 18 and 20 to support the weight of the elevator. As shown, the plunger 32 is supported between the spaced beams 18 and 20 by a locating S crosshead 34 secured in a slot cut into the upper end of the plunger 32. However, other plunger-to-cab frame connections may be employed, for example connections similar to those used in inst211ations where the plunger 32 is attached to the bottom of the cab frame. Also, while the plunger 32 is shown as 10 coupled to the beams 18 and 20, the plunger may be attached to other overhead frame members capable of supporting the elevator cab.
In operation, when the elevator cab 10 is lowered to the ground Gr basement floor (i.e. the lowest floor), 1~ the plunger 32 is retracted into the telescoping cylinders 29 and 30 of the hydraulic jack 26. The elevator cab 10 slides down over the cylinder 30 of the jack 26, such that the cylinders 29 and 30 and the plunger 32 are disposed within the confines of the elevator cab 10. ~hen the elevator 20 cab rises, cylinder 30 remains stationary and the telescoping cylinder 29, the plunger 32 and the elevator cab rise. At the upper end of the plunger stroke, the elevator cab 10 is disposed above the outer cylinder 30, such that the cylinder 30 no longer is disposed within the hole 28. As sho~Y-n in ~iss.
2~ 1-3, a ?rotective sleeve 33 is mounted in the elevator cab 10 about the jack 26 to protect passengers and freight from injury resultant from the relative motion bet~een cylinders 30 and 29 and the c~b 10.
1176~35 Figure 4 discloses the preferred location of the hydraulic liftlng mechanism, which is shown in Fig. 4 as a conventional (i.e. non-telescoping) hydraulic jack 26'. The elevator cab 10' is disposed in a hoistway 50. Rail guides 52 are disposed to either side of the cab 10-', and received in cooperating tracks 54 mounted to the hoistway walls 51. Rail guides 52 may be bolted or welded to frame member 14' and 16', or otherwise suitably attached to the frame. The guides 52 are shown as U-shaped channels, however guides of the roller-type may be employed. Each track 54 is preferably mounted to the hoistway walls 51 utilizing rail mounting brackets of the type disclosed in my prior U.S. patent No. 3,948,358. The elevator cab 10' includes a platform 12', sidewalls ~0 and a door return column 42, which conventionally houses an operating panel and 1; other equipment. Door 44 is slidably disposed in a conventional manner in the front end of the elevator cab 10' to the side of the door return column 42.
The platform 12' is supported on the frame, which lncludes stile members 14' and 16', and lower bolster members 22' and 24'. In this manner, the plunger 32l extends upwardly through the door return column 42 and engages the overhead cross-beams or other overhead cross-members (not shown) close to the center of gravity of the cab 10'.
The foregoing represents the preferred embodiments 2_ of the invention. Variations and modifications of the disclosed embodiments will be apparent to persons skilled in the art while em,?loying the inventive concepts disclosed herein. All such modifications and variations are intended to be within the scope of the invention as defined in the following claims.
1176~35 Figure 4 discloses the preferred location of the hydraulic liftlng mechanism, which is shown in Fig. 4 as a conventional (i.e. non-telescoping) hydraulic jack 26'. The elevator cab 10' is disposed in a hoistway 50. Rail guides 52 are disposed to either side of the cab 10-', and received in cooperating tracks 54 mounted to the hoistway walls 51. Rail guides 52 may be bolted or welded to frame member 14' and 16', or otherwise suitably attached to the frame. The guides 52 are shown as U-shaped channels, however guides of the roller-type may be employed. Each track 54 is preferably mounted to the hoistway walls 51 utilizing rail mounting brackets of the type disclosed in my prior U.S. patent No. 3,948,358. The elevator cab 10' includes a platform 12', sidewalls ~0 and a door return column 42, which conventionally houses an operating panel and 1; other equipment. Door 44 is slidably disposed in a conventional manner in the front end of the elevator cab 10' to the side of the door return column 42.
The platform 12' is supported on the frame, which lncludes stile members 14' and 16', and lower bolster members 22' and 24'. In this manner, the plunger 32l extends upwardly through the door return column 42 and engages the overhead cross-beams or other overhead cross-members (not shown) close to the center of gravity of the cab 10'.
The foregoing represents the preferred embodiments 2_ of the invention. Variations and modifications of the disclosed embodiments will be apparent to persons skilled in the art while em,?loying the inventive concepts disclosed herein. All such modifications and variations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an hydraulic elevator installation comprising a hoistway, an elevator cab disposed in said hoistway and having a frame including at least one overhead frame member capable of supporting the weight of said cab, and an hydraulic jack means having a plunger capable of moving between extended and retracted positions for raising and lowering said cab in said hoistway, the improvement wherein said jack means comprises a cylinder fixedly mounted in a vertical position in said hoistway, wherein said plunger extends upwardly through said cab, and wherein said cylinder extends upwardly through said cab when said jack means is in said retracted position, and comprising coupling means between said plunger and said overhead frame member for supporting said overhead frame member and thereby said cab on said plunger.
2. An hydraulic elevator installation as defined in claim l, wherein said jack means comprises a telescoping cylinder jack.
3. An hydraulic elevator installation as defined in claim 1, wherein said at least one overhead frame member comprises an overhead beam.
4. An hydraulic elevator installation as defined in claim 1, wherein said at least one overhead frame member comprises a pair of spaced overhead beams.
5. An hydraulic elevator installation as defined in claim 4, wherein said coupling means comprises a crosshead between said spaced overhead beams and said plunger.
6. An hydraulic elevator installation as defined in claim 1 or 2, wherein said cab comprises means for enclosing said jack means for protecting passengers and freight in said cab from relative movement between said cylinder and said cab.
7. An hydraulic elevator installation as defined in claim 1, wherein said jack means and said overhead frame member are disposed in a forward portion of said cab.
8. An hydraulic elevator installation as defined in claim 1, wherein said cab comprises a door return column in a forward portion of said cab and wherein said jack means is disposed within said door return column.
9. An hydraulic elevator installation as defined in claim 8, wherein said frame includes side frame members associated with said overhead frame member and wherein said overhead and side frame members are disposed in said forward portion of said cab.
10. An hydraulic elevator installation as defined in claim 9, comprising rail guides mounted to said side frame members.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US29527081A | 1981-08-24 | 1981-08-24 | |
| US295,270 | 1981-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1176185A true CA1176185A (en) | 1984-10-16 |
Family
ID=23136986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000404641A Expired CA1176185A (en) | 1981-08-24 | 1982-06-07 | Hydraulic elevators |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1176185A (en) |
| GB (1) | GB2104477B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG75168A1 (en) * | 1998-05-08 | 2000-09-19 | Inventio Ag | Hydraulic elevator |
| CN104003265B (en) * | 2014-06-18 | 2016-04-27 | 沈传良 | Reversely hung Yong side hydraulic pressure goods lift |
-
1982
- 1982-06-07 CA CA000404641A patent/CA1176185A/en not_active Expired
- 1982-08-19 GB GB08223928A patent/GB2104477B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2104477A (en) | 1983-03-09 |
| GB2104477B (en) | 1985-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |