US149604A - Improvement in lifting-jacks - Google Patents
Improvement in lifting-jacks Download PDFInfo
- Publication number
- US149604A US149604A US149604DA US149604A US 149604 A US149604 A US 149604A US 149604D A US149604D A US 149604DA US 149604 A US149604 A US 149604A
- Authority
- US
- United States
- Prior art keywords
- lever
- jacks
- lifting
- improvement
- pawl
- 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
- 241000139306 Platt Species 0.000 description 4
- 210000003414 Extremities Anatomy 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 239000007787 solid Substances 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
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/02—Devices, e.g. jacks, adapted for uninterrupted lifting of loads with racks actuated by pinions
Definitions
- Fig. l Arepresents the standard or support connected with a suitable base, provided with an adjustable and sliding upright, B, in which are notches vb for the reception of the cogs d 011 the wheel D.
- C in the drawings represents a pawl, the purpose of which. in my invention is to secure or hold the sliding upright B at any desired point of elevation while the lifting-jack is being operated.
- D is an ordinary cog-wheel, and needs no description.
- E represents a lever, at the inner extremity of which, and on either side, are extensions or cars G G, in which are corresponding slots.
- the slots F F are so arranged that, upon a downward movement of the lever, the pawl e in the lever becomes necessarily and immovably fixed between the cogs, and, by an upward movement of the lever, said pawl c becomes necessarily detached, which permits the lever to be raised for a new hold or purchase, without changing the position of the adjustable upright and cogwheel.
- the inner termination of the solid portion of the lever E forms the pawl e, which meshes in between the cogs for the purpose of forcingthe cog-wheel downward, thereby raising the adjustable and sliding upright B.
- the lever E provided with slotted ears G and pawl e, in combination with cog-wheel D, rackbar B, standard A, and pivoted pawl C, substantially as and for the purposes shown and described.
Description
G. H. PLATT'.
, Lifting-Jacks.
N0.l49 604. Patented Aprl1 4,1874,
ATTORNEYS,
UNITED STATES PATENT OEEIcE GEORGE H. PLATT, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR OF PART OF HIS RIGHT TO JAMES R. HUNTER AND GEORGE W. HUNTER, OF
SAME PLACE.
IMPROVEMENT IN LlFTlNG-JACKS.v
Specification forming part of Letters Patent No. 149,604, dated April 14, 1874; application filed April 2, 1874.
To all whom it may concern:
Be it known that I, GEORGE H. PLATT, of Washington, in the District of Columbia, have invented a new and useful Improvement in Lifting-Jacks; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings forming a part of this specification, in which- Figure l is a front or plan view of the standardor support in elevation, and the lever at its lowest point. Fig. 2 representsa side view of the lever, slot, and the oog-wheel in position.
In Fig. l, Arepresents the standard or support connected with a suitable base, provided with an adjustable and sliding upright, B, in which are notches vb for the reception of the cogs d 011 the wheel D. C in the drawings represents a pawl, the purpose of which. in my invention is to secure or hold the sliding upright B at any desired point of elevation while the lifting-jack is being operated. D is an ordinary cog-wheel, and needs no description. E represents a lever, at the inner extremity of which, and on either side, are extensions or cars G G, in which are corresponding slots. The slots F Fin the extensions or ears G G diverge from the center or fulcrum upward and outward, for the reception of the axle their oflice being to allow the pawl e to become disconnected from the cogs d in the wheel D while the lever E is being raised. The slots F F are so arranged that, upon a downward movement of the lever, the pawl e in the lever becomes necessarily and immovably fixed between the cogs, and, by an upward movement of the lever, said pawl c becomes necessarily detached, which permits the lever to be raised for a new hold or purchase, without changing the position of the adjustable upright and cogwheel. The inner termination of the solid portion of the lever E forms the pawl e, which meshes in between the cogs for the purpose of forcingthe cog-wheel downward, thereby raising the adjustable and sliding upright B.
Having thus fully described my invention,
what I claim as new, and desire to secure by Letters Patent, is-
The lever E, provided with slotted ears G and pawl e, in combination with cog-wheel D, rackbar B, standard A, and pivoted pawl C, substantially as and for the purposes shown and described.
GEORGE H. PLATT.
Witnesses:
GEO. W. HUNTER, WARREN G. STONE.
Publications (1)
Publication Number | Publication Date |
---|---|
US149604A true US149604A (en) | 1874-04-14 |
Family
ID=2219017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US149604D Expired - Lifetime US149604A (en) | Improvement in lifting-jacks |
Country Status (1)
Country | Link |
---|---|
US (1) | US149604A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040267690A1 (en) * | 2003-06-26 | 2004-12-30 | International Business Machines Corporation | Integrated development environment with context sensitive database connectivity assistance |
-
0
- US US149604D patent/US149604A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040267690A1 (en) * | 2003-06-26 | 2004-12-30 | International Business Machines Corporation | Integrated development environment with context sensitive database connectivity assistance |
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