GB190714338A - Improvements in or relating to Lifting Jacks. - Google Patents
Improvements in or relating to Lifting Jacks.Info
- Publication number
- GB190714338A GB190714338A GB190714338DA GB190714338A GB 190714338 A GB190714338 A GB 190714338A GB 190714338D A GB190714338D A GB 190714338DA GB 190714338 A GB190714338 A GB 190714338A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bar
- nut
- lever
- engagement
- screw
- 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
Landscapes
- Transmission Devices (AREA)
Abstract
14,338. Lake, A. E. Dec. 4. Lifting-jacks are con structed with a lever motion for raising, and a screw motion for lowering Fig. 1 shows a jack in which the load is supported by a crutch E at the top of the rack - bar A. A lever H and spring pawl J are used to raise the load the screwed nut B in the meantime being dis. engaged from the rack-bar by being rotated about its pivot F by the ascending bar. For lowering, the pawl J is disengaged from the rack by means of the chain L, and the screwed nut is then rotated by means of levers inserted in slots B<1>. The bar A may have two racks, one for engagement with the screwed nut and the other for engagement with the lever and pawl. Fig. 2 shows a modified nut which slides out of engagement with the rack-bar on the spindle C' and has the screw-thread formed on its bevelled under surface. Fig. 4 shows a jack in which a racked lifting-bar is engaged by a pinion mounted on the shaft L<1> behind the wheel M. This wheel is rotated, for raising the load, by means of the lever H and spring pawl J, the worm B meanwhile being forced out of engagement against the action of the spring N. The pawl is disengaged and the screw rotated to lower the load, as before. The worm-wheel M may be connected to the shaft L' by a one-way clutch and the worm B may always remain in engagement with it. Fig. 5 shows another form of jack having a circular lifting-bar with a screw-thread of quick pitch arranged so that the nut B will fall by its own weight, when the bar is lifted, and engage the bevelled friction surface C<3>. A sleeve J surrounds the screw and grips the bar A for raising purposes when turned into an inclined position by means of the lever H. When the sleeve J rests on the projection C<2> in the casing, the bar A is released and may be lowered by rotating the screwed nut B. The nut may be made in two parts arranged to move apart when the lifting- bar is raised, as described in Specification No. 6591, A.D. 1905.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB190714338T | 1907-12-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB190714338A true GB190714338A (en) | 1908-05-28 |
Family
ID=32550183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB190714338D Expired GB190714338A (en) | 1907-12-04 | 1907-12-04 | Improvements in or relating to Lifting Jacks. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB190714338A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170320713A1 (en) * | 2016-04-25 | 2017-11-09 | William P. Curtis | Jack stand apparatus and method |
-
1907
- 1907-12-04 GB GB190714338D patent/GB190714338A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170320713A1 (en) * | 2016-04-25 | 2017-11-09 | William P. Curtis | Jack stand apparatus and method |
US10597268B2 (en) * | 2016-04-25 | 2020-03-24 | William P. Curtis | Jack stand apparatus and method |
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