US10902A - Francis davis - Google Patents
Francis davis Download PDFInfo
- Publication number
- US10902A US10902A US10902DA US10902A US 10902 A US10902 A US 10902A US 10902D A US10902D A US 10902DA US 10902 A US10902 A US 10902A
- Authority
- US
- United States
- Prior art keywords
- jack
- screw
- francis
- davis
- head
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 4
- 210000003165 Abomasum Anatomy 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000875 corresponding 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
- 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
- FRANCIS DAvIs FRANCIS DAvIs, CE KEENE, NEwHAursHIRE, AssICNoR To J. M. REED.
- My jack is made entirely of iron.
- A is the head; B, the foot; C, the socket which receives the hand lever D for operating the jack.
- Attached to the socket C are the right and left screws E and F, which are adapted to corresponding females in the head and foot A, B. i
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Control Devices (AREA)
Description
s fi* 'I UFFICE.
FRANCIS DAvIs, CE KEENE, NEwHAursHIRE, AssICNoR To J. M. REED.
SCREW-JACK.
Specification of Letters `I1ate11t No. 10,902, dated May 9, 1854.
To all 107mm t may concern Be it known that I, FRANCIS DAvrs, of Keene, in the county of Cheshire and State of New Hampshire, have invented certain new and useful Improvements in Screw- Jacks; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the annexed drawings, making part of this specification, in which- Figure l is a view of my screw jack, and Fig. 2 a section through the center of the saine.
In screw jacks as heretofore constructed a single screw has been made use of, and in order to give this screw the greatest possible amount of motion the head which re ceives the lever or bar by which the screw was moved was placed as near the top of jack as possible, and in consequence of this arrangement the operating lever or bar was brought immediately beneath the body to be raised and so near to it that its motion was much obstructed thereby.
To obviate this inconvenience and at the same time to produce a jack having capabilities not heretofore possessed by my instrument of the kind with which I am acquainted is the object of my present invention, which `consists in the use of a right and left screw, with the head or socketfor the operating lever between them, whereby the latter is removed to an equal distance from the top and bottom ends of the jack, andthe motion of the head `of the jack is double that of the ordinary screw jack for an equal motion of the operating lever and in an equal space of time, by which means a great saving of time and power is effected,
To enable others skilled in the art to make and use my improved jack I will proceed to describe its construction and operation.
My jack is made entirely of iron.
A is the head; B, the foot; C, the socket which receives the hand lever D for operating the jack. Attached to the socket C are the right and left screws E and F, which are adapted to corresponding females in the head and foot A, B. i
It is evident that as thelever D is turned to operate the screws E and F, the motion of the head of the jack will be double that which would be obtainable from the use-of a sinble screw with an equal amount of power applied. Thus the same amount of with an expenditure of but little more than` one half the power required for the operation of the ordinary jack, while the position of the operating lever is such that it is not obstructed either by the body above or the ground beneath.
I do not claim the use of a right and left screw, as this has been made use of before; neither do I claim constructing a screw-jack entirely of iron; but
W'hat I do claim as my invention and desire to secure by Letters Patent as a new tool or instrument for the purpose of raising heavy bodies is- Y The above described ack constructed and operating in the manner set forth.
FRANCIS DAvIs.
lVitnesses IVM. P. WHEELER, LUCIUs H. HAL-L.
Publications (1)
Publication Number | Publication Date |
---|---|
US10902A true US10902A (en) | 1854-05-09 |
Family
ID=2071232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10902D Expired - Lifetime US10902A (en) | Francis davis |
Country Status (1)
Country | Link |
---|---|
US (1) | US10902A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2907508A (en) * | 1954-04-16 | 1959-10-06 | Acme Steel Co | Container for granular materials |
-
0
- US US10902D patent/US10902A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2907508A (en) * | 1954-04-16 | 1959-10-06 | Acme Steel Co | Container for granular materials |
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