US56111A - Improvement in lifting-jacks - Google Patents
Improvement in lifting-jacks Download PDFInfo
- Publication number
- US56111A US56111A US56111DA US56111A US 56111 A US56111 A US 56111A US 56111D A US56111D A US 56111DA US 56111 A US56111 A US 56111A
- Authority
- US
- United States
- Prior art keywords
- lifting
- bar
- jacks
- catch
- improvement
- 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
- 210000003414 Extremities Anatomy 0.000 description 4
- 230000000875 corresponding Effects 0.000 description 4
- 230000000994 depressed Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000002452 interceptive Effects 0.000 description 2
- 230000036633 rest Effects 0.000 description 2
- 230000000284 resting Effects 0.000 description 2
Images
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
- A is the stock, which has the chamber C running about one-half of its length, open to the front, and thence upward through the center of the stock A to receive the jack-bar B7 which has guides along its rear side, as shown, iitting into corresponding wings to the chamber G.
- This bar B is notched on its front side, as shown, to receive the point of the 1ever ⁇ D, which moves up and down upon a fulcrum formed by a stirrup, E, which is hinged to the stock at F T, and depending supports the lever D at a point as near the stock A as will permit the action of the lever.
- the catch G is placed in a chamber on the front of the stock, and has a stem, around which a coiled wire spring, G", is placed, which rests against the front of the chamber at one extremity and at the other against the shoulder of the catch.
- This catch is square on top and beveled on the lower side to correspond with the shape of the notches in the bar. It is as wide as the notches on the bar.
- the lever is also beveled on its lower edge at its posterior extremity, where it 4comes into connection with thebar, so as to make apoint for its insertion without interfering with the tooth below, the handle being elevated and the lever placed under one of the notches in the bar. It is then depressed, and the bar being forced upward, the inclined portion of the tooth resting against the corresponding portion of the catch, the catch will be forced back, the spiral spring' yielding to the pressure until, the tooth being raised beyond the catch, it is released, and immediately the spring throws it back, thus preventing the descent of the bar when the lever is released.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Impact Printers (AREA)
Description
UNITED STATES PATENT OFFICE.
LUTHER SMITH, OF ROCHESTER, MINNESOTA.
IMPROVEMENT IN LlFTlNG-JACKS.
Specification forming part of Letters Patent N0. 56,1 l l, dated July 3, 1866.
.To all whom it may concern:
Be it known that I, LUTHER SMITH, of Rochester, in the county of Olmsted and State of Minnesota, have invented a new and useful Improvement in Lifting-Jacks and Ido hereby declare that the following is a full, clear, and exact description of the same, reference bein g had to the annexed drawings, made part of this specication, in Which- Figure l is an elevation, showing the front of the lifting-jack; and Fig. 2 is a vertical section on the line :c w, Fig. l.
The same letters refer to identical parts.
A is the stock, which has the chamber C running about one-half of its length, open to the front, and thence upward through the center of the stock A to receive the jack-bar B7 which has guides along its rear side, as shown, iitting into corresponding wings to the chamber G. This bar B is notched on its front side, as shown, to receive the point of the 1ever`D, which moves up and down upon a fulcrum formed by a stirrup, E, which is hinged to the stock at F T, and depending supports the lever D at a point as near the stock A as will permit the action of the lever.
The catch G is placed in a chamber on the front of the stock, and has a stem, around which a coiled wire spring, G", is placed, which rests against the front of the chamber at one extremity and at the other against the shoulder of the catch. This catch is square on top and beveled on the lower side to correspond with the shape of the notches in the bar. It is as wide as the notches on the bar.
The lever is also beveled on its lower edge at its posterior extremity, where it 4comes into connection with thebar, so as to make apoint for its insertion without interfering with the tooth below, the handle being elevated and the lever placed under one of the notches in the bar. It is then depressed, and the bar being forced upward, the inclined portion of the tooth resting against the corresponding portion of the catch, the catch will be forced back, the spiral spring' yielding to the pressure until, the tooth being raised beyond the catch, it is released, and immediately the spring throws it back, thus preventing the descent of the bar when the lever is released.
Having thus fully explained the character of my improvements, what I claim as my invention, and seek t0 secure by Letters Patent,
l. The catch G, actuated by the spiralspring G', in combination with the jack-bar B.
2. The arrangement of a lifting-jack having the stock A, bar B, lever D, stirrup E, catch G, and spiral spring G', the parts being constructed and'combined substantially as and for the purpose set forth.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
LUTHER SMITH.
Witnesses WALTER S. BOOTH, J. A. LEONARD.
Publications (1)
Publication Number | Publication Date |
---|---|
US56111A true US56111A (en) | 1866-07-03 |
Family
ID=2125651
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US56111D Expired - Lifetime US56111A (en) | Improvement in lifting-jacks |
Country Status (1)
Country | Link |
---|---|
US (1) | US56111A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2723104A (en) * | 1952-06-16 | 1955-11-08 | George Moxon Mining Ltd | Mine jack |
-
0
- US US56111D patent/US56111A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2723104A (en) * | 1952-06-16 | 1955-11-08 | George Moxon Mining Ltd | Mine jack |
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