CA2170940C - Screw jack - Google Patents
Screw jackInfo
- Publication number
- CA2170940C CA2170940C CA002170940A CA2170940A CA2170940C CA 2170940 C CA2170940 C CA 2170940C CA 002170940 A CA002170940 A CA 002170940A CA 2170940 A CA2170940 A CA 2170940A CA 2170940 C CA2170940 C CA 2170940C
- Authority
- CA
- Canada
- Prior art keywords
- bevel gear
- case body
- outer sleeve
- bed
- large bevel
- 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
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
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
-
- 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
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
- B66F3/10—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated with telescopic sleeves
-
- 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
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
- B66F3/16—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through bevel-wheel gearings
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
- Transmission Devices (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
A screw jack comprising a bed, a case body having a groove formed therein and mounted on an upper surface of the bed, and a thrust bearing mounted on a central area of the upper surface of the bed. A large bevel gear is placed on the bed through the thrust bearing such that a main threaded shaft of the large bevel gear is secured at a lower end thereof to the thrust bearing and erected upwardly therefrom. A small bevel gear carried on the case body through a bearing meshes with the large bevel gear. An outer sleeve is guided along the groove of the case body. A heavy object raising inner sleeve is disposed within the outer sleeve and is guided by the outer sleeve. The main threaded shaft is rotated through the large bevel gear by the small bevel gear which is rotated by an external driver so that a heavy object is raised. The case body is integrally formed of aluminum casting or hard resin.
Description
21'~0~4.a TITLE OF THE INVENTION
SCREW JACK
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to a screw jack, which is also known as j ackscrew, used for raising heavy obj ects such as automobiles and the like.
SCREW JACK
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to a screw jack, which is also known as j ackscrew, used for raising heavy obj ects such as automobiles and the like.
2. Brief Description of the Prior Art 1o Heretofore, there are widely used screw j acks of the type in which a case body portion is of steel plate construction or of a rigid construction of FC casting. Usually, an outer sleeve part contacting the case body is a molded product having a tubular configuration. The outer sleeve is provided with a key 15 groove so that the sleeve will not rotate.
However, the above conventional screw jacks have the following shortcomings. In the case of the screw jacks of steel plate construction, the screw jacks are comprised of a plurality of component parts and therefore; the steps for 20 manufacturing such component parts are required. This ' eventually results in high cost. In the case of the screw jacks of a rigid construction of FC casting, the weight of final products tends to be increased.
Moreover, since the component part serving as the outer sleeve which contacts the case body is subjected to key groove treatment in order to prevent the outer sleeve from rotating with the use of the groove, the steps for manufacturing such key grooves are required. Furthermore, there is a need of using an outer sleeve part having a thick wall enough to be subjected to key groove treatment. The use of an outer sleeve part having a thick wall makes it even difficult to lower the manufacturing cost and also to reduce the weight of final products.
The present invention has been accomplished in view of the above situation.
SUMMARY OF THE INVENTION
The present invention provides a screw jack which is simple in construction, light in weight and inexpensive to manufacture.
According to the present invention, there is provided a screw jack comprising a bed; a case body having a groove formed therein and mounted on an upper surface of said bed; a thrust bearing mounted on a central area of the upper surface of said bed; a large bevel gear placed on said bed through said thrust bearing such that a main threaded shaft of said large bevel gear is secured at a lower end thereof to said thrust bearing and erected upwardly therefrom; a small bevel gear carried on said case body through a bearing and meshed with said large bevel gear; an outer 21709a sleeve guided along the groove of the case body; and a heavy object raising inner sleeve disposed within the outer sleeve and guided by the outer sleeve; the main threaded shaft being rotated, through the large bevel gear, by the small bevel gear which is rotated by an external driver means, so that a heavy object is raised, wherein the case body is integrally formed of aluminum casting or hard resin.
From another aspect of the invention, there is also provided a screw j ack including an outer sleeve guided along a 1o case body and adapted to guide a heavy object raising inner sleeve, wherein the outer sleeve is formed by bending a planar plate into a tubular shape and overlapping and jointing opposite end faces of the tubular-shaped plate such that the j ointed portion proj ects outwardly, the proj ected j ointed portion being fitted in a groove vertically formed in the case body so that the outer sleeve is prevented from rotating.
The above and other objects and attendant advantages of the present invention will be apparent to those skilled in the art from a reading of the following description and claims in conjunction with the accompanying drawings which constitute part of this specification.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a vertical sectional side view of a screw jack according to one embodiment of the present invention;
~ 17 ~0'~ 4!0 Fig. 2 is a side view, partly cut-away, of only a case body of the screw jack of Fig. 1;
Fig. 3 is a plan view of the case body;
Fig. 4 is a side view of an outer sleeve of the screw jack of Fig. 1;
Fig. 5 is a plan view of the outer sleeve; and Fig. 6 is a plan view showing a relation between the case body and the outer sleeve.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
One preferred embodiment of a screw j ack according to the present invention will now be described in detail with reference to the accompanying drawings.
Reference numeral 1 denotes a case body of the screw jack.
This case body 1 is integrally formed of aluminum casting or hard resin. Reference numeral 2 denotes a bed of a generally square shape, which is made of steel material: A recess 2a is formed in a central area of an upper surface of the bed 2. The recess 2a is such dimensioned that when the bed 2 is placed on 2o the contacting ground surface W, a bottom surface of the recess 2a is flush with the ground surface W. The case body 1 is ' mounted on the bed 2 with a flange portion of the case body 1 firmly secured to the surface of the bed 2 with rivets ( not shown ) or the like .
A thrust bearing 3 is disposed in the recess 2a of the bed 2~7~~4~0 2 and a large bevel gear 5 is placed on the thrust bearing 3.
A lower end of a main threaded shaft 4, which is provided with a threaded portion 4a in an outer periphery thereof, is fixed to the large bevel gear 5, for example, by means of knocking and the main threaded shaft 4 is erected upwardly from the large bevel gear 5. The large bevel gear 5 is meshed with a small bevel gear 6 on a shaft 6a which is carried on a bearing portion la integrally formed on the case body 1. The bearing portion la is located on an inclined line ( not shown ) connecting the center of the large bevel gear 5 and the center of the shaft 6a.
A handle joint 7 is provided on one end of the shaft 6a.
The handle j oint 7 is rotated by a suitable external driving means, so that a rotational force is transmitted to the large bevel gear 5 through the small bevel gear 6.
The threaded portion 4a of the main threaded shaft 4 is engaged with a threaded portion 8a formed on an inner side of a lower part of an auxiliary threaded sleeve 8. A threaded portion 8b on an outer periphery of the auxiliary threaded sleeve 8 is engaged with a threaded portion 9a formed on an 2o inner side of a lower part of a heavy object raising inner sleeve 9. The inner sleeve 9 is provided with a groove 9b formed in an outer periphery thereof and extending in a vertical direction of the inner sleeve 9. An engagement portion 10a as later described is formed, by knocking, on an upper part side of an outer sleeve 10 in such a manner as to __ 217~~4~
project inwardly. The engagement portion 10a is engaged in the groove 9b in order to prevent rotation of the heavy object raising inner sleeve 9 and also to guide the inner sleeve 9 when the inner sleeve 9 is lifted upwardly and downwardly.
A receiving metal piece 11 is rotatably fitted to an upper end of the heavy object raising inner sleeve 9 through a ring or the like. The receiving metal piece 11 is adapted to receive a heavy object, when placed thereon, such as, for example, automobile or the like. The outer sleeve 10 is formed by a 1o Planar steel plate. The planar steel plate is bent and formed into a tubular shape. Then, flat surface portions a, and b on opposite side edges of the steel sheet are overlapped and welded c such that the welded portion pro j ects outwardly, thereby defining a key portion 10b. The outer sleeve 10 is provided on an upper portion of the other side thereof with an engagement portion 10a for engaging in the groove 9b of the inner sleeve 9 and on a lower end thereof with an escape preventive portion 10c protruding outwardly, so that a stopper lc formed on an inner wall of the case body 1 is engaged 2o therewith, thereby to prevent the outer sleeve 10 from escaping upwardly by restricting a further upward movement of the outer sleeve 10.
The key portion 10b of the outer sleeve 10 is fitted in the vertical groove lb formed in the inner wall of the case body 1, so that the outer sleeve 10 is prevented from rotation and so 2~70~~0 that the heavy object raising inner sleeve 9 is prevented from rotation through the engagement portion 10a of the outer sleeve 10.
Owing to the above-mentioned arrangement, when the large bevel gear 5 of the main threaded shaft 4 erected upwardly from the thrust bearing 3 located on the center of the bed 2 is rotated by rotating the small bevel gear 6 which is meshed with the large bevel gear 5 and carried on the bearing portion la of the case body 1 with the handle joint 7 disposed outside the case body 1, the main threaded shaft 4 is rotated through the main bevel gear 5. Rotation of the main threaded shaft 4 causes the auxiliary threaded sleeve 8 to gradually move upwardly because the threaded portion 8a of the auxiliary threaded sleeve 8 is meshed with the threaded portion 4a of the main threaded portion 4 and because the auxiliary threaded sleeve 8 is guided by the outer sleeve 10 which is guided by the case body 1. In this way, the heavy object such as automobile loaded on the receiving metal piece 11 is finally raised. That is, the outer sleeve 10 is caused to stop rotation by the case body 1 2o and the heavy abject raising inner sleeve 9 is also caused to stop rotation through the outer sleeve 10. Accordingly, rotation of the main threaded portion 4 is transmitted gradually to the heavy object raising inner sleeve 9, thereby raising and lowering the heavy object loaded on the receiving metal piece 11.
As described hereinbefore, the case body is integrally formed of aluminum resin or hard resin. Accordingly, the number of component parts and working processes can be reduced.
Also, in the outer sleeve portion, a planar plate is bent and formed into a tubular shape and the faces of the opposite end sides of the tubular shaped plate are overlapped and j ointed such that an outwardly protruded portion thereof forms a key portion. Accordingly, there is no need of a provision of a key groove, the material can be made thinner, and the number of 1o manufacturing processes can be reduced. Incidentally, today, exhaust gas of automobiles comes to be a social problem in view of air pollution. Thus, there is a strong requirement for making automobiles lighter in weight as much as possible. The screw j ack according to the present invention can fully meet this requirement in the respect that the component parts can be made light in weight and manufacturing costs of the component parts can be lowered .
It is to be understood that the form of the invention herewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.
However, the above conventional screw jacks have the following shortcomings. In the case of the screw jacks of steel plate construction, the screw jacks are comprised of a plurality of component parts and therefore; the steps for 20 manufacturing such component parts are required. This ' eventually results in high cost. In the case of the screw jacks of a rigid construction of FC casting, the weight of final products tends to be increased.
Moreover, since the component part serving as the outer sleeve which contacts the case body is subjected to key groove treatment in order to prevent the outer sleeve from rotating with the use of the groove, the steps for manufacturing such key grooves are required. Furthermore, there is a need of using an outer sleeve part having a thick wall enough to be subjected to key groove treatment. The use of an outer sleeve part having a thick wall makes it even difficult to lower the manufacturing cost and also to reduce the weight of final products.
The present invention has been accomplished in view of the above situation.
SUMMARY OF THE INVENTION
The present invention provides a screw jack which is simple in construction, light in weight and inexpensive to manufacture.
According to the present invention, there is provided a screw jack comprising a bed; a case body having a groove formed therein and mounted on an upper surface of said bed; a thrust bearing mounted on a central area of the upper surface of said bed; a large bevel gear placed on said bed through said thrust bearing such that a main threaded shaft of said large bevel gear is secured at a lower end thereof to said thrust bearing and erected upwardly therefrom; a small bevel gear carried on said case body through a bearing and meshed with said large bevel gear; an outer 21709a sleeve guided along the groove of the case body; and a heavy object raising inner sleeve disposed within the outer sleeve and guided by the outer sleeve; the main threaded shaft being rotated, through the large bevel gear, by the small bevel gear which is rotated by an external driver means, so that a heavy object is raised, wherein the case body is integrally formed of aluminum casting or hard resin.
From another aspect of the invention, there is also provided a screw j ack including an outer sleeve guided along a 1o case body and adapted to guide a heavy object raising inner sleeve, wherein the outer sleeve is formed by bending a planar plate into a tubular shape and overlapping and jointing opposite end faces of the tubular-shaped plate such that the j ointed portion proj ects outwardly, the proj ected j ointed portion being fitted in a groove vertically formed in the case body so that the outer sleeve is prevented from rotating.
The above and other objects and attendant advantages of the present invention will be apparent to those skilled in the art from a reading of the following description and claims in conjunction with the accompanying drawings which constitute part of this specification.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a vertical sectional side view of a screw jack according to one embodiment of the present invention;
~ 17 ~0'~ 4!0 Fig. 2 is a side view, partly cut-away, of only a case body of the screw jack of Fig. 1;
Fig. 3 is a plan view of the case body;
Fig. 4 is a side view of an outer sleeve of the screw jack of Fig. 1;
Fig. 5 is a plan view of the outer sleeve; and Fig. 6 is a plan view showing a relation between the case body and the outer sleeve.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
One preferred embodiment of a screw j ack according to the present invention will now be described in detail with reference to the accompanying drawings.
Reference numeral 1 denotes a case body of the screw jack.
This case body 1 is integrally formed of aluminum casting or hard resin. Reference numeral 2 denotes a bed of a generally square shape, which is made of steel material: A recess 2a is formed in a central area of an upper surface of the bed 2. The recess 2a is such dimensioned that when the bed 2 is placed on 2o the contacting ground surface W, a bottom surface of the recess 2a is flush with the ground surface W. The case body 1 is ' mounted on the bed 2 with a flange portion of the case body 1 firmly secured to the surface of the bed 2 with rivets ( not shown ) or the like .
A thrust bearing 3 is disposed in the recess 2a of the bed 2~7~~4~0 2 and a large bevel gear 5 is placed on the thrust bearing 3.
A lower end of a main threaded shaft 4, which is provided with a threaded portion 4a in an outer periphery thereof, is fixed to the large bevel gear 5, for example, by means of knocking and the main threaded shaft 4 is erected upwardly from the large bevel gear 5. The large bevel gear 5 is meshed with a small bevel gear 6 on a shaft 6a which is carried on a bearing portion la integrally formed on the case body 1. The bearing portion la is located on an inclined line ( not shown ) connecting the center of the large bevel gear 5 and the center of the shaft 6a.
A handle joint 7 is provided on one end of the shaft 6a.
The handle j oint 7 is rotated by a suitable external driving means, so that a rotational force is transmitted to the large bevel gear 5 through the small bevel gear 6.
The threaded portion 4a of the main threaded shaft 4 is engaged with a threaded portion 8a formed on an inner side of a lower part of an auxiliary threaded sleeve 8. A threaded portion 8b on an outer periphery of the auxiliary threaded sleeve 8 is engaged with a threaded portion 9a formed on an 2o inner side of a lower part of a heavy object raising inner sleeve 9. The inner sleeve 9 is provided with a groove 9b formed in an outer periphery thereof and extending in a vertical direction of the inner sleeve 9. An engagement portion 10a as later described is formed, by knocking, on an upper part side of an outer sleeve 10 in such a manner as to __ 217~~4~
project inwardly. The engagement portion 10a is engaged in the groove 9b in order to prevent rotation of the heavy object raising inner sleeve 9 and also to guide the inner sleeve 9 when the inner sleeve 9 is lifted upwardly and downwardly.
A receiving metal piece 11 is rotatably fitted to an upper end of the heavy object raising inner sleeve 9 through a ring or the like. The receiving metal piece 11 is adapted to receive a heavy object, when placed thereon, such as, for example, automobile or the like. The outer sleeve 10 is formed by a 1o Planar steel plate. The planar steel plate is bent and formed into a tubular shape. Then, flat surface portions a, and b on opposite side edges of the steel sheet are overlapped and welded c such that the welded portion pro j ects outwardly, thereby defining a key portion 10b. The outer sleeve 10 is provided on an upper portion of the other side thereof with an engagement portion 10a for engaging in the groove 9b of the inner sleeve 9 and on a lower end thereof with an escape preventive portion 10c protruding outwardly, so that a stopper lc formed on an inner wall of the case body 1 is engaged 2o therewith, thereby to prevent the outer sleeve 10 from escaping upwardly by restricting a further upward movement of the outer sleeve 10.
The key portion 10b of the outer sleeve 10 is fitted in the vertical groove lb formed in the inner wall of the case body 1, so that the outer sleeve 10 is prevented from rotation and so 2~70~~0 that the heavy object raising inner sleeve 9 is prevented from rotation through the engagement portion 10a of the outer sleeve 10.
Owing to the above-mentioned arrangement, when the large bevel gear 5 of the main threaded shaft 4 erected upwardly from the thrust bearing 3 located on the center of the bed 2 is rotated by rotating the small bevel gear 6 which is meshed with the large bevel gear 5 and carried on the bearing portion la of the case body 1 with the handle joint 7 disposed outside the case body 1, the main threaded shaft 4 is rotated through the main bevel gear 5. Rotation of the main threaded shaft 4 causes the auxiliary threaded sleeve 8 to gradually move upwardly because the threaded portion 8a of the auxiliary threaded sleeve 8 is meshed with the threaded portion 4a of the main threaded portion 4 and because the auxiliary threaded sleeve 8 is guided by the outer sleeve 10 which is guided by the case body 1. In this way, the heavy object such as automobile loaded on the receiving metal piece 11 is finally raised. That is, the outer sleeve 10 is caused to stop rotation by the case body 1 2o and the heavy abject raising inner sleeve 9 is also caused to stop rotation through the outer sleeve 10. Accordingly, rotation of the main threaded portion 4 is transmitted gradually to the heavy object raising inner sleeve 9, thereby raising and lowering the heavy object loaded on the receiving metal piece 11.
As described hereinbefore, the case body is integrally formed of aluminum resin or hard resin. Accordingly, the number of component parts and working processes can be reduced.
Also, in the outer sleeve portion, a planar plate is bent and formed into a tubular shape and the faces of the opposite end sides of the tubular shaped plate are overlapped and j ointed such that an outwardly protruded portion thereof forms a key portion. Accordingly, there is no need of a provision of a key groove, the material can be made thinner, and the number of 1o manufacturing processes can be reduced. Incidentally, today, exhaust gas of automobiles comes to be a social problem in view of air pollution. Thus, there is a strong requirement for making automobiles lighter in weight as much as possible. The screw j ack according to the present invention can fully meet this requirement in the respect that the component parts can be made light in weight and manufacturing costs of the component parts can be lowered .
It is to be understood that the form of the invention herewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.
Claims (2)
1. A screw jack comprising a bed; a case body having a groove formed therein and mounted on an upper surface of said bed; a thrust bearing mounted on a central area of the upper surface of said bed; a large bevel gear placed on said bed through said thrust bearing such that a main threaded shaft of said large bevel gear is secured at a lower end thereof to said thrust bearing and erected upwardly therefrom; a small bevel gear carried on said case body through a bearing and meshed with said large bevel gear; an outer sleeve guided along the groove of said case body; and a heavy object raising inner sleeve disposed within said outer sleeve and guided by said outer sleeve; said main threaded shaft being rotated, through said large bevel gear, by said small bevel gear which is rotated by an external driver means, so that a heavy object is raised, wherein said case body is integrally formed of aluminum casting or hard resin.
2. A screw jack including an outer sleeve guided along a case body and adapted to guide a heavy object raising inner sleeve, wherein said outer sleeve is formed by bending a planar plate into a tubular shape and overlapping and jointing opposite end faces of said tubular-shaped plate such that the jointed portion projects outwardly, the projected jointed portion being fitted in a groove vertically formed in said case
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1995001989U JP3019266U (en) | 1995-03-16 | 1995-03-16 | Screw jack |
| JP1989/1995 | 1995-03-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2170940A1 CA2170940A1 (en) | 1996-09-17 |
| CA2170940C true CA2170940C (en) | 1999-08-17 |
Family
ID=11516899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002170940A Expired - Lifetime CA2170940C (en) | 1995-03-16 | 1996-03-04 | Screw jack |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP3019266U (en) |
| AU (1) | AU678742B2 (en) |
| CA (1) | CA2170940C (en) |
| DE (1) | DE19609905C2 (en) |
| GB (1) | GB2298848B (en) |
| ZA (1) | ZA961777B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001206677A (en) * | 2000-01-26 | 2001-07-31 | Kawasaki Kogyo Kk | Screw jack |
| US8678471B2 (en) | 2007-01-19 | 2014-03-25 | Rieco-Titan Products, Inc. | In-line jack |
| PL414876A1 (en) * | 2015-11-23 | 2017-06-05 | Isps Spółka Z Ograniczoną Odpowiedzialnością | A lift for lifting and supporting, preferably heavy structural elements |
| CN108900607B (en) * | 2018-06-28 | 2021-06-29 | 郑州云海信息技术有限公司 | SMB protocol request processing method and device and server |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB307859A (en) * | 1927-12-15 | 1929-03-15 | Arthur Ernest Lake | Improvements in or relating to lifting-jacks |
| GB372871A (en) * | 1931-03-06 | 1932-05-19 | Arthur Ernest Lake | Improvements in or relating to screw lifting jacks |
| GB388584A (en) * | 1931-03-20 | 1933-03-02 | Georges Sizaire | Improvements in lifting-jacks for motor vehicles |
| US2054025A (en) * | 1934-10-09 | 1936-09-08 | Bingham Stamping & Tool Compan | Lifting jack |
| US4000880A (en) * | 1975-01-27 | 1977-01-04 | Auto Specialties Manufacturing Company | Screw jack |
| DE2920133C2 (en) * | 1979-05-18 | 1981-11-12 | Alfred 4072 Wickrath Bautz | Lifting device with at least two mutually telescoping threaded spindles |
| DE3575411D1 (en) * | 1985-10-01 | 1990-02-22 | Osaka Jack Co | SCREW WINCH. |
| JPH0643108Y2 (en) * | 1990-09-28 | 1994-11-09 | 竹内工業株式会社 | Screw type jack |
-
1995
- 1995-03-16 JP JP1995001989U patent/JP3019266U/en not_active Expired - Lifetime
-
1996
- 1996-02-27 AU AU45756/96A patent/AU678742B2/en not_active Expired
- 1996-03-01 GB GB9604394A patent/GB2298848B/en not_active Expired - Lifetime
- 1996-03-04 CA CA002170940A patent/CA2170940C/en not_active Expired - Lifetime
- 1996-03-05 ZA ZA961777A patent/ZA961777B/en unknown
- 1996-03-14 DE DE19609905A patent/DE19609905C2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU4575696A (en) | 1996-10-03 |
| GB9604394D0 (en) | 1996-05-01 |
| GB2298848A (en) | 1996-09-18 |
| ZA961777B (en) | 1996-12-10 |
| GB2298848B (en) | 1998-08-26 |
| CA2170940A1 (en) | 1996-09-17 |
| DE19609905C2 (en) | 2000-07-06 |
| JP3019266U (en) | 1995-12-12 |
| AU678742B2 (en) | 1997-06-05 |
| DE19609905A1 (en) | 1996-09-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20160304 |