US146235A - Improvement in lifting-jacks - Google Patents
Improvement in lifting-jacks Download PDFInfo
- Publication number
- US146235A US146235A US146235DA US146235A US 146235 A US146235 A US 146235A US 146235D A US146235D A US 146235DA US 146235 A US146235 A US 146235A
- Authority
- US
- United States
- Prior art keywords
- lifting
- prop
- lever
- jacks
- 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
- 230000000630 rising Effects 0.000 description 4
- SHCMKWXVHLOSIU-UHFFFAOYSA-N 5-hydroxy-7-(4-hydroxy-2,5-dimethoxyphenyl)-2,2-dimethylpyrano[3,2-g]chromen-6-one Chemical compound C1=C(O)C(OC)=CC(C=2C(C3=C(O)C=4C=CC(C)(C)OC=4C=C3OC=2)=O)=C1OC SHCMKWXVHLOSIU-UHFFFAOYSA-N 0.000 description 2
- 230000003028 elevating Effects 0.000 description 2
- 230000036633 rest 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
- B66F15/00—Crowbars or levers
Definitions
- This invention relates to lifting -jacks in which the raising of the sliding prop is effected by a cam-shaped head on the liftin g-lever.
- My improvement consists in pivoting the liftinglever on the sliding prop in such a manner that its cam-shaped head will bear upon the top of the standard.
- Figure l is a perspective .view of my improved lifting jack.
- Fig. 2 is a sectional elevation thereof.
- the standard A is embraced by the hollow sliding prop B, which carries near its upper end the lifting-lever C, permanent ly pivoted to it in such relation to the standard that, when the prop rests uponthe base of the latter, the cam-shaped head of the lever, bearing upon its top, will throw the lever into a nearly-vertical position, as shown in Fig. 2.
- the :inclination of the cam-surface of the head C is made very gradual, permitting of the use of a lever of medium length to exert the requisite amount of power with ease; and the lever, being pivoted at an elevated point, can be moved through between its fulcrum, when at rest, and the base of the standard.
- the fulcrum-pin. c projects some distance through the sliding-prop on one side, and carries on its overhung end a hook-bar, D, provided with a vertical series of holes, d, which permit of its readyvertical adjustment.
- This hook-bar may be hung upon or connected to the prop directly, if preferred. It is of great convenience in lifting panels of rail fences and other objects which cannot readily be operated upon in the usual manner, but afford facilities for the use of a hook.
- the top of the prop is stepped in the usual manner. y,
- the solid standard A and hollow sliding prop B in combination with the lifting-lever C C', when the latter is pivoted at an elevated point to the prop, bearing with its cam-shaped head upon the standard, substantially as and for the purpose specified.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Display Devices Of Pinball Game Machines (AREA)
Description
' UNITED STATES PATENT FFIGE EMANUEL B. OUMP, OF COLUMBUS, OHIO.
IMPROVEMENT IN LIFTING-JACKS.
Specication forming part of Letters Patent No. 146,235, dated J anuary, 1874; application filed December 2, 1873.
To all whom t may concern:
Be it known that I, EMANUEL B. OUMP, of Columbus, in the county of Franklin and State of Ohio have invented an Improvement in Lifting-jacks, of which the following is a specication:
This invention relates to lifting -jacks in which the raising of the sliding prop is effected by a cam-shaped head on the liftin g-lever. My improvement consists in pivoting the liftinglever on the sliding prop in such a manner that its cam-shaped head will bear upon the top of the standard.
In making' this change in the ordinary arrangement of the parts, two objects were had in view--irst, the obtainment of a long range of motion of the lever, by elevating its t'ulcrum without unduly elongatin g the standard and prop, to enable me to use, for lifting the prop a given distance, a cam of less abruptness and consequently greater power; and, secondly, the rising of the lever bodily as it is turned down on its fulcrum, for the greater convenience of operating it.
In the annexed drawings, Figure l is a perspective .view of my improved lifting jack. Fig. 2 is a sectional elevation thereof.
The --same letters of reference are used in both figures in the designation of identical parts.
The standard A is embraced by the hollow sliding prop B, which carries near its upper end the lifting-lever C, permanent ly pivoted to it in such relation to the standard that, when the prop rests uponthe base of the latter, the cam-shaped head of the lever, bearing upon its top, will throw the lever into a nearly-vertical position, as shown in Fig. 2. The :inclination of the cam-surface of the head C is made very gradual, permitting of the use of a lever of medium length to exert the requisite amount of power with ease; and the lever, being pivoted at an elevated point, can be moved through between its fulcrum, when at rest, and the base of the standard. Another important ad vantage is derived from the bodily rising of the lever with the 'sliding prop, and that consists ofthe greater ease with which it may be operated by reason of remaining, through the greater part of its path, at elevation most cony venient to the operator in manipulating it. i
The fulcrum-pin. c projects some distance through the sliding-prop on one side, and carries on its overhung end a hook-bar, D, provided with a vertical series of holes, d, which permit of its readyvertical adjustment. This hook-bar may be hung upon or connected to the prop directly, if preferred. It is of great convenience in lifting panels of rail fences and other objects which cannot readily be operated upon in the usual manner, but afford facilities for the use of a hook. The top of the prop is stepped in the usual manner. y,
What I claim as my inventiomand desire to secure by Letters Patent, is-
The solid standard A and hollow sliding prop B, in combination with the lifting-lever C C', when the latter is pivoted at an elevated point to the prop, bearing with its cam-shaped head upon the standard, substantially as and for the purpose specified.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
EMANUEL B. GUMP.
Witnesses:
(1S. S. GRIEFmG, W. D. PACKARD.
Publications (1)
Publication Number | Publication Date |
---|---|
US146235A true US146235A (en) | 1874-01-06 |
Family
ID=2215649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US146235D Expired - Lifetime US146235A (en) | Improvement in lifting-jacks |
Country Status (1)
Country | Link |
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US (1) | US146235A (en) |
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- US US146235D patent/US146235A/en not_active Expired - Lifetime
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