US229727A - Lifting-jack - Google Patents
Lifting-jack Download PDFInfo
- Publication number
- US229727A US229727A US229727DA US229727A US 229727 A US229727 A US 229727A US 229727D A US229727D A US 229727DA US 229727 A US229727 A US 229727A
- Authority
- US
- United States
- Prior art keywords
- jack
- bar
- lifting
- teeth
- column
- 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
- 241000282472 Canis lupus familiaris Species 0.000 description 6
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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
- B66F1/00—Devices, e.g. jacks, for lifting loads in predetermined steps
- B66F1/02—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts
- B66F1/04—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed
- B66F1/06—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed and the devices being actuated mechanically
Definitions
- the object of this invention is to provide a simple and eifective double-action lifting-j ack; and the invention consists of a hollow racktoot-hed column, in which moves a vertical working-bar that carries pivoted on its head a bifurcated lever, within each end of which lever are pivoted curved swinging pawls that engage alternately with the rack-teeth of the column as the lever is operated, and thereby elevate the working-bar.
- the drawing represents a perspective view of the, device with a portion broken away to better exhibit other parts.
- A represents the column, supported on base B, provided with rack-teeth a a on opposite faces, and having a vertical slot, 1), in one face, extending from and through the base B up to the rack-teeth a, a.
- Said bar C is the working-bar, set within the column A provided with a lug, c, that projects laterally from its lower end through the slot b, and is designed to be engaged beneath objects that are too low for the engagement of the head of the jack for the purpose of raising them, and also prevents the said bar C from being raised too high and prevents it from turning around.
- Said bar C is also provided with a rectangular head, d.
- the bifurcated lever D embraces (ModeL) and is pivoted to this head d, and has pivoted within it, on either side of the head d of the working-bar C, a curved depending dog or pawl, E, whose lower ends engagein the rackteeth a a of the column A.
- the dogs or pawls E E alternately engage in the rack-teeth (t a, and thereby raise the workin bar C, while on disengaging said pawls E E from the teeth a a the bar C will fall, so that its head (I will rest upon the top of the column A.
- These dogs or pawls E E are so curved that they require no springs to hold them engaged with the rack-teeth a a when the jack is in a vertical position.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Description
(HodeL) J. F. MQOORMIGK.
Lifting Jack.
No. 229,727. Patented July 6, 1880.
I NVENTOR I aW/Wmo/V ATTORNEYS.
N. PETERS, PHOTO-LITHOGR UNITED STATES PATENT OFFICE.
JAMES F. MCCORMICK, OF LOUISVILLE, KENTUCKY.
LlFTlNG-JAC K.
SPECIFICATION forming part of Letters Patent No. 229,727, dated July 6, 1880.
Application filed April 7, 1880.
To all whom it may concern:
Be itknown that I, JAMES F. McGoRMIoK, of Louisville, in the county of Jefferson and State of Kentucky, have invented a new and Improved Lifting-Jack, of which the following is a specification.
The object of this invention is to provide a simple and eifective double-action lifting-j ack; and the invention consists of a hollow racktoot-hed column, in which moves a vertical working-bar that carries pivoted on its head a bifurcated lever, within each end of which lever are pivoted curved swinging pawls that engage alternately with the rack-teeth of the column as the lever is operated, and thereby elevate the working-bar.
The drawing represents a perspective view of the, device with a portion broken away to better exhibit other parts.
A represents the column, supported on base B, provided with rack-teeth a a on opposite faces, and having a vertical slot, 1), in one face, extending from and through the base B up to the rack-teeth a, a.
C is the working-bar, set within the column A provided with a lug, c, that projects laterally from its lower end through the slot b, and is designed to be engaged beneath objects that are too low for the engagement of the head of the jack for the purpose of raising them, and also prevents the said bar C from being raised too high and prevents it from turning around. Said bar C is also provided with a rectangular head, d. The bifurcated lever D embraces (ModeL) and is pivoted to this head d, and has pivoted within it, on either side of the head d of the working-bar C, a curved depending dog or pawl, E, whose lower ends engagein the rackteeth a a of the column A.
As the lever D is reciprocated up and down by power applied to the handle f thereof, the dogs or pawls E E alternately engage in the rack-teeth (t a, and thereby raise the workin bar C, while on disengaging said pawls E E from the teeth a a the bar C will fall, so that its head (I will rest upon the top of the column A. These dogs or pawls E E are so curved that they require no springs to hold them engaged with the rack-teeth a a when the jack is in a vertical position.
Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The combination, with the stationary column A, having upwardly-inclined teeth on opposite sides, of the movable bar C, having lug c and head d, the lever D, and the downwardly-acting pawls E E, pivoted to opposite arms of said lever, as shown and described.
2. in a lifting-jack, the combination, with the hollow column A, provided with rack-teeth a a and slot b, of the working-bar C, provided with lug 0 and head 61, substantially as herein shown and described.
JAMES FRANCES MCCORMICK.
Witnesses:
ROBERT MOALEESE, JOHN F. HAIN.
Publications (1)
Publication Number | Publication Date |
---|---|
US229727A true US229727A (en) | 1880-07-06 |
Family
ID=2299104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US229727D Expired - Lifetime US229727A (en) | Lifting-jack |
Country Status (1)
Country | Link |
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US (1) | US229727A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4227254A1 (en) * | 2022-02-14 | 2023-08-16 | Christoph Ziebura | Positioning device |
-
0
- US US229727D patent/US229727A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4227254A1 (en) * | 2022-02-14 | 2023-08-16 | Christoph Ziebura | Positioning device |
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