US88923A - Improvement in lifting-jacks - Google Patents
Improvement in lifting-jacks Download PDFInfo
- Publication number
- US88923A US88923A US88923DA US88923A US 88923 A US88923 A US 88923A US 88923D A US88923D A US 88923DA US 88923 A US88923 A US 88923A
- Authority
- US
- United States
- Prior art keywords
- lever
- pawl
- lifting
- arm
- jacks
- 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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- 230000036633 rest Effects 0.000 description 2
- 229920000638 styrene acrylonitrile Polymers 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
- B66F1/00—Devices, e.g. jacks, for lifting loads in predetermined steps
- B66F1/02—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts
- B66F1/04—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed
- B66F1/06—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed and the devices being actuated mechanically
Definitions
- the object of my invention is to provide an improved lifting-jack, so constructed that heavy weights may be either raised or gradually lowered, as desired, by the same movement of the lever, and this is accomplished by means of a pawl pivoted directly over the operating lever, having a curved projection at the end opposite that which operates in the rack.
- a weighted arm is hinged to the arm of the lever, and is thrown over, so as to rest upon the curved projection, and by its weight free the pawl from the teeth, when it is desired to lower the rack, and by operating the lever the pawl is freed from each tooth by the weighted armat each down ward movement and caused to catch the next tooth above as the lever is raised, by the weighted arm striking a spring, made of rubber, or other suitable material attached to the lever, near its eentre.
- A is an upright frame, or guide, similar to that usually employed in lifting-jacks.
- the lifting-slide B moves up and down in ways, and
- the end of the lever C is constructed so as to en gage the teeth of the rack.
- a pawl, D which engages the teeth of the rack as it is raised by the lever C.
- the pawl D acts similar to those generally used and engages the teeth consecutively as they are raised by the lever, the upper portion of the pawl being heavier than the lower.
- a weighted arm, E which is hinged to the lever at d, is thrown over, so as to fall upon the curved or lower portion, h, of the pawl, and by the extra weight thus brought to bear upon that part, it raises the pawl from the rack at each downward movement of the lever, and as the lever is raised, the arm E striking the spring c, causes it to catch the tooth next above, and so on' lowering the slide at each movement.
- a lug, g projects upward from the arm of the lever, between the pawl and arm E, upon which the arm E rests, when the handle of the lever is raised suciently to free it from the curved end vh of the pawl.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Press Drives And Press Lines (AREA)
- Percussion Or Vibration Massage (AREA)
Description
dilated d/tane TIMOTHY SIEBINS, OF SAN FRANCISCO, CALIFORNIA. Lette/rs Patent No. 88,923, dated April 13, 1869.
IMPROVEMENT IN LIFTING-J'ACKS.
To all whom 'it may concern:
Be it known that I, TIMOTHY ScnnBrNs, of the city and county of San Francisco, State of California, have invented an Improved Lifting-Jack; and I do hereby declare the following description and accompanying drawings are sufficient to enable any person skilled in the art or science to which it most nearly appertains, to make and use my said invention or improvements without further invention or experiment.
The object of my invention is to provide an improved lifting-jack, so constructed that heavy weights may be either raised or gradually lowered, as desired, by the same movement of the lever, and this is accomplished by means of a pawl pivoted directly over the operating lever, having a curved projection at the end opposite that which operates in the rack.
A weighted arm is hinged to the arm of the lever, and is thrown over, so as to rest upon the curved projection, and by its weight free the pawl from the teeth, when it is desired to lower the rack, and by operating the lever the pawl is freed from each tooth by the weighted armat each down ward movement and caused to catch the next tooth above as the lever is raised, by the weighted arm striking a spring, made of rubber, or other suitable material attached to the lever, near its eentre.-
To more fully explain my invention, reference is had to the accompanying drawings, forminga part of this specification, which represent a side sectional elevation.
A is an upright frame, or guide, similar to that usually employed in lifting-jacks.
The lifting-slide B moves up and down in ways, and
lis provided with the usual rack.
Near the top of the frame,'and on each side, are lugs, a a, to which- 'the operating lever O'is hung by means of links, b b, as shown.
The end of the lever C is constructed so as to en gage the teeth of the rack.
Between the links b b, and pivoted near its middle, is a pawl, D, which engages the teeth of the rack as it is raised by the lever C. l
The opposite end, h., of this pawl is curved outward, and a spring, c, is attached near its middle.
In this situation, the pawl D acts similar to those generally used and engages the teeth consecutively as they are raised by the lever, the upper portion of the pawl being heavier than the lower.
When it is desired to lower the slide B, a weighted arm, E, which is hinged to the lever at d, is thrown over, so as to fall upon the curved or lower portion, h, of the pawl, and by the extra weight thus brought to bear upon that part, it raises the pawl from the rack at each downward movement of the lever, and as the lever is raised, the arm E striking the spring c, causes it to catch the tooth next above, and so on' lowering the slide at each movement.
A lug, g, projects upward from the arm of the lever, between the pawl and arm E, upon which the arm E rests, when the handle of the lever is raised suciently to free it from the curved end vh of the pawl.
Having thus described my invention,
What I claim, and desire to secure by Letters Patentis'- In a lifting-j ack, the weighted arm E, on the lever O, and the spring c, together with the pawl, having the curved end h, substantially as herein described.
In witness whereof, I have hereunto set my hand and seal.
Y TIMOTHY STEBINS. [1.. s]
.Witnesses:
Gno. H. STRONG, J. L. BOONE.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US88923A true US88923A (en) | 1869-04-13 |
Family
ID=2158405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US88923D Expired - Lifetime US88923A (en) | Improvement in lifting-jacks |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US88923A (en) |
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0
- US US88923D patent/US88923A/en not_active Expired - Lifetime
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