US152482A - Improvement in lifting-jacks - Google Patents
Improvement in lifting-jacks Download PDFInfo
- Publication number
- US152482A US152482A US152482DA US152482A US 152482 A US152482 A US 152482A US 152482D A US152482D A US 152482DA US 152482 A US152482 A US 152482A
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- US
- United States
- Prior art keywords
- lifting
- standard
- jacks
- improvement
- lever
- 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
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- 239000007787 solid Substances 0.000 description 6
- 210000003371 Toes Anatomy 0.000 description 2
- 230000002459 sustained Effects 0.000 description 2
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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 that class of lifting-jacks in which the sliding bar or prop is lifted by the action of an eccentric head of a lever connected to the standard.
- My improvement consists in so combining the lifting lever with the sliding prop and standard that the pin connecting it to the latter shall be wholly relieved of the superincumbent weight, which will be borne by the eccentric head turning between the prop and a solid abutment of the standard.
- Figure 1 is a perspective view of my improved lifting-jack.
- Fig. 2 is a side elevation, one side of the standard having been removed to show the better the form and arrangement of the adjustable base and lever.
- the sliding prop B is arranged in the stand ard A, as clearly shown, and is stepped at its upper end in the usual manner.
- the lifting-lever C has an eccentric or cam shaped head, provided with a toe, c, which will remain seated upon the base or abutment D, when the cam has completed its upward throw, and its summit stands perpemlicularly over its fulcrum, thus serving to steady the head while it carries the weight.
- the fulcrum of the lever is at c, the point of contact between its head and the base D, but it turns upon and is guided in its movements by the pin a projecting from it at both sides into vertically-elongated slots a in the sides of the standard.
- the eccentric head of the lever may bear directly upon the supporting-base or any rigidly-fixed abutment on the standard; but I prefer to employ for its fulcrum an adjustable abutment or base, D, made of oblong form, and inserted between the sides of the standard, to which it is connected by a pin, (1, extending into vertically elongated slots (1 therein.
- D adjustable abutment or base
- the abutment will in either position rest upon a solid foundation of the standard, and the slots a and cl are sufliciently long to admit of the described adjustment of the parts.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Description
G. S. S. GRIFFING.
Lifting-Jacks.
Patented June 30,1874.
PATENT GFFIGE.
CHARLES S. S. GBIFFING, OF COLUMBUS, OHIO.
IMPROVEMENT IN LlFTlNG-JACKS.
Specification forming part of Letters Patent No. 152,482, dated June 30, 1874; application filed December 2, 1873.
To all whom it may concern:
Be it known that I, CHARLES S. S. GRIF- FING, of Columbus, in the county of Franklin and State of Ohio, have invented an Improvement in Lifting-Jacks, of which the following is a specification:
This invention relates to that class of lifting-jacks in which the sliding bar or prop is lifted by the action of an eccentric head of a lever connected to the standard.
Heretofore it has been customary to permanently pivot the lever to the standard, so that the entire strain and weight of the object raised were sustained by the pivot-pin, which is ob jeetionable for obvious reasons.
My improvement consists in so combining the lifting lever with the sliding prop and standard that the pin connecting it to the latter shall be wholly relieved of the superincumbent weight, which will be borne by the eccentric head turning between the prop and a solid abutment of the standard. I also employ an adjustable abutment or base, so formed that the normal height of the sliding prop may be readily changed to suit different conditions.
I11 the annexed drawings, Figure 1 is a perspective view of my improved lifting-jack. Fig. 2 is a side elevation, one side of the standard having been removed to show the better the form and arrangement of the adjustable base and lever.
The same letters of reference are used in both figures in the designation of identical parts.
The sliding prop B is arranged in the stand ard A, as clearly shown, and is stepped at its upper end in the usual manner. The lifting-lever C has an eccentric or cam shaped head, provided with a toe, c, which will remain seated upon the base or abutment D, when the cam has completed its upward throw, and its summit stands perpemlicularly over its fulcrum, thus serving to steady the head while it carries the weight. The fulcrum of the lever is at c, the point of contact between its head and the base D, but it turns upon and is guided in its movements by the pin a projecting from it at both sides into vertically-elongated slots a in the sides of the standard. Thus the entire weight is taken from the pin a, which now only sustains the light lateral strain in operating the lever. The eccentric head of the lever may bear directly upon the supporting-base or any rigidly-fixed abutment on the standard; but I prefer to employ for its fulcrum an adjustable abutment or base, D, made of oblong form, and inserted between the sides of the standard, to which it is connected by a pin, (1, extending into vertically elongated slots (1 therein. By shifting this abutment from lying on its side, as shown in Fig. 1, to standing on end, as exhibited in Fig. 2, thenormal height of the lifting-prop can be conveniently changed, as occasion may require. The abutment will in either position rest upon a solid foundation of the standard, and the slots a and cl are sufliciently long to admit of the described adjustment of the parts.
WVhat I claim as my invention, and desire to secure by Letters Patent, is
The standard A and sliding prop B, in combination with the lifting-lever C, which turns on the axis of a pin, a, but has its fulcrum upon a solid abutment either fixed or adjustable on the standard. substantially as and for the purpose specified.
In testimony whereof I have signed my name to the foregoing specification in the presence of two subscribing witnesses.
C. S. S. GRIFFING. lVitnesses EMANUEL B. OUMP, W. D. PACKARD.
Publications (1)
Publication Number | Publication Date |
---|---|
US152482A true US152482A (en) | 1874-06-30 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US152482D Expired - Lifetime US152482A (en) | Improvement in lifting-jacks |
Country Status (1)
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US (1) | US152482A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040016322A1 (en) * | 2000-01-11 | 2004-01-29 | Bobby Hu | Reversible ratcheting tool with a smaller head and improved driving torque |
-
0
- US US152482D patent/US152482A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040016322A1 (en) * | 2000-01-11 | 2004-01-29 | Bobby Hu | Reversible ratcheting tool with a smaller head and improved driving torque |
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