US157254A - Improvement in lifting-jacks - Google Patents
Improvement in lifting-jacks Download PDFInfo
- Publication number
- US157254A US157254A US157254DA US157254A US 157254 A US157254 A US 157254A US 157254D A US157254D A US 157254DA US 157254 A US157254 A US 157254A
- Authority
- US
- United States
- Prior art keywords
- screw
- lifting
- jacks
- improvement
- nut
- 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
- HODFCFXCOMKRCG-UHFFFAOYSA-N bitolterol mesylate Chemical compound CS([O-])(=O)=O.C1=CC(C)=CC=C1C(=O)OC1=CC=C(C(O)C[NH2+]C(C)(C)C)C=C1OC(=O)C1=CC=C(C)C=C1 HODFCFXCOMKRCG-UHFFFAOYSA-N 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 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
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
Definitions
- My invention consists in the construction, substantially as hereinafter described, of a machine or instrument for the. more convenient application ofthe power of the screw,either for raising weights or for effectin g compression in either direction.
- the drawing represents a machine embodying the principle of my invention, applicable to the handling of railroad-iron, to the lifting of heavy weights, and to the production of powerful upward pressure.
- a large screw, S passes down through an opening in the middle of the cross-beam C.
- a large nut, N held in position by the yokebea1n D, as shown in Fig. l.
- the nut is circular in shape, as
- a hand-wheel, G is fixed to the screw S, by which the screw may be rotated.
- the operation is as follows: The machine being placed astraddle of the work, the weight to be lifted is grasped by the grapnel. The hand-wheel G is then operated, turning the screw S in the direction to raise it. When the strain becomes too heavy'to be raised by the hand-wheel, the crank K is called into use, turning the worm W and the nut N. The weight not being allowed to rotate, the turn- 'ing ofthe nut in the proper direction will raise the screw S and the weight attached to it.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Machines For Laying And Maintaining Railways (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Description
D. T. W ELC H.
Lifting-lacks.
PatentedNov. 24,1874.
, a I mmm UNITED STATES PATENT OFFICEo DAVID T. 4WELCH, OF ST. LOUIS, MISSOURI.
IMPROVEMENT IN LlFTlNG-JACKS.
Specification forming part of Letters Patent No. 157,254, dated November 24, 1874 g application lled October 20, 1874.
To all whom it may concern:
Beit known that I, DAVID T. WELCH, of St. Louis, in the State of Missouri, have invented an Improved Screw-Jack for Lifting or Applying' Pressure; and I do hereby dclare the following to be afull and correct description of the same, reference being had to the accompanying drawings, in which- Figure lis a side elevation, partly in section, of my machine. Fig. 2 is a horizontal section 011 line x at of Fig. l.
The same letter indicates the same part in both Iigures.
My invention consists in the construction, substantially as hereinafter described, of a machine or instrument for the. more convenient application ofthe power of the screw,either for raising weights or for effectin g compression in either direction.
The drawing represents a machine embodying the principle of my invention, applicable to the handling of railroad-iron, to the lifting of heavy weights, and to the production of powerful upward pressure.
In the drawing, A A mark the u'feet of the machine, which support two uprights, B B, united at top by a cross-beam, O. These together form a gallows of convenient shape for straddling the work. A large screw, S, passes down through an opening in the middle of the cross-beam C. Upon it is a large nut, N, held in position by the yokebea1n D, as shown in Fig. l. The nut is circular in shape, as
. seen in Fig. 2, and has cut upon its perimeter a thread to receive and engage the threads of a worm, W', on the horizontal shaft F. The journals of this shaft turn in boxes in the ends of the arms E E. They project beyond the ends of the frame, and either or both may have a crank, K, attached, by which the shaft F can be rotated. Swiveling on the top of the screw S is a platen, H, intended for use when the machine is employed as a press. On the lower end ofthe screw is a swivel, to which is affixed a grapnel for holding the weight to be lifted. (In this case shown as a railroad-rail.) Above the screw-thread a hand-wheel, G, is fixed to the screw S, by which the screw may be rotated.
The operation is as follows: The machine being placed astraddle of the work, the weight to be lifted is grasped by the grapnel. The hand-wheel G is then operated, turning the screw S in the direction to raise it. When the strain becomes too heavy'to be raised by the hand-wheel, the crank K is called into use, turning the worm W and the nut N. The weight not being allowed to rotate, the turn- 'ing ofthe nut in the proper direction will raise the screw S and the weight attached to it.
By proper graduation of the pitch of the worm, nut, and screw-threads, and of the length of the crank-arm, any desired multiplication of the applied power can be effected.
It is obvious that, by the same arrangement of mechanism, a press of great power can be produced by the addition of the necessary platens.
Having thus described my invention, what I claim, and desire to secure byLetters Patent, 1s`
The combination of the uprights B B, crossbeam O, and yoke-beam D with the crank K, shaft F, worm W, nut N, and screw S, provided with a swivel and grapnel, all constructed substantially as and for the purpose set fort-h.
The above specification of my said invention signed and witnessed at St. Louis this 23d day of September, A. D. 1874.
DAVID T. WELCH. Witnesses:
GEo. W. GRIFFIN, THos. WEBsTER.
Publications (1)
Publication Number | Publication Date |
---|---|
US157254A true US157254A (en) | 1874-11-24 |
Family
ID=2226664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US157254D Expired - Lifetime US157254A (en) | Improvement in lifting-jacks |
Country Status (1)
Country | Link |
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US (1) | US157254A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2523880A (en) * | 1949-03-30 | 1950-09-26 | Charles R Schoenfielder | Rail lifting device |
US20070084461A1 (en) * | 2005-10-19 | 2007-04-19 | Asml Netherlands B.V. | Lithographic apparatus, device manufacturing method and radiation collector |
-
0
- US US157254D patent/US157254A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2523880A (en) * | 1949-03-30 | 1950-09-26 | Charles R Schoenfielder | Rail lifting device |
US20070084461A1 (en) * | 2005-10-19 | 2007-04-19 | Asml Netherlands B.V. | Lithographic apparatus, device manufacturing method and radiation collector |
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