US271863A - Lifting-jack - Google Patents
Lifting-jack Download PDFInfo
- Publication number
- US271863A US271863A US271863DA US271863A US 271863 A US271863 A US 271863A US 271863D A US271863D A US 271863DA US 271863 A US271863 A US 271863A
- Authority
- US
- United States
- Prior art keywords
- lever
- jack
- lifting
- pawl
- bar
- 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
- 238000010276 construction Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 230000000284 resting 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
- 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
- My invention relates to an improvement in lever-jacks.
- the object of my invention is to provide a powerful and durable lever-jack.
- FIG. 1 represents a vertical central sectional -view of Aa lever-jackfrconstructed in accordance with my invention Fig. 2, abroken view similar to Fig. 1, showing a modification of the invention, the rack-bar being elevated; F1g. 3, a'transverse sectional view on the line a' a: of Fig. 1; and Fig. 4 is a perspective view of the-tripblock.
- A represents the base of the jack; B, the upright frame; O, the rack-bar; I), the holding# pawl, which is preferably constructed as shown in my former Letters Patent No. 154,989, granted'me lSeptember' 15, 1874.
- E represents the slotted opening in the upper part of the frame, in which the pawls and lever operate to engage with the rack-bar.
- F represents a stud-link on which the lever G hinges, so as to allow it to be moved in and out to operatethe rack-bar.
- lg g represent forks forming the inner end of lever Gr, and between which link F are pivoted.
- Lever G is moved out or ,in bythe oscillation of ⁇ stud F on its fulcra near the bottom of opening E.
- I represents a trip-block, which is employed to trip the jack. It is shown in position for tripping in Fig. 2, the shoulder t' resting on the lifting-pawl H, and the top engaging with the bottom of the holding-'pawl D.
- lever Gr is raised pawl D slides upward in its boXout of mesh with the teeth of rack-bar C, which drops and lowers the load.
- the trip-block I In combination with the holding-pawlD and lifting-pawl H, pivoted to the Swingin g 1ever Gr, the trip-block I, adapted to engage between the pawls,'substantially as herein setV forth.
Description
(N Model.)
Patented Feb;v 6, 1888-.
.xL!!!wllLllnllIyllxLhLLLl UNITED STATES' PATENT OFFICE.
JACOB O. JOYCE, OF DAYTON, OHIO.
LlFTlNG-JACK.
SPECIFICATION forming part of Letters Patent No. 271,863, dated February 6, 1883.
Application nieu August e5, 1832. (No model i To aLL whom it may concern: p
Be it known that I, JACOB O. JOYCE, a citi zen of the United States, and a resident of the city of Dayton, in the county of Montgomery and State of Ohio, have invented certainnew and useful Improvements in Lifting-Jacks, of which the following is a specification. i
My invention relates to an improvement in lever-jacks. v
The object of my invention is to provide a powerful and durable lever-jack.
Another object of my invention is to so construct a leverjaclr employing many toothed lifting and holding pawls that a tripping dez vice can be readily applied to suddenly throw out the holding-paw] and drop the lifting-bar, all ot' which will be explained in the description of the construction and operation of my improvement, which is illustrated in the annexed drawings, in which- Figure 1 represents a vertical central sectional -view of Aa lever-jackfrconstructed in accordance with my invention Fig. 2, abroken view similar to Fig. 1, showing a modification of the invention, the rack-bar being elevated; F1g. 3, a'transverse sectional view on the line a' a: of Fig. 1; and Fig. 4 is a perspective view of the-tripblock.
A represents the base of the jack; B, the upright frame; O, the rack-bar; I), the holding# pawl, which is preferably constructed as shown in my former Letters Patent No. 154,989, granted'me lSeptember' 15, 1874.
E represents the slotted opening in the upper part of the frame, in which the pawls and lever operate to engage with the rack-bar. F represents a stud-link on which the lever G hinges, so as to allow it to be moved in and out to operatethe rack-bar. lg g represent forks forming the inner end of lever Gr, and between which link F are pivoted. Lever G is moved out or ,in bythe oscillation of` stud F on its fulcra near the bottom of opening E.
I represents a trip-block, which is employed to trip the jack. It is shown in position for tripping in Fig. 2, the shoulder t' resting on the lifting-pawl H, and the top engaging with the bottom of the holding-'pawl D. When lever Gr is raised pawl D slides upward in its boXout of mesh with the teeth of rack-bar C, which drops and lowers the load. By pivoting the lever G on the stud-linkF, and pivoting the parts in the free openingE of the frame, a sufficient movement of the lever G is obtained to carry it, with the suspended pawl H, backward and upward far enough from the rack-bar O to allow ofthe ready insertion or removal of the trip-block I.
1. In a lever-jack, the lever G,hnged to the stud-link F, within the opening E of the frame of the jack, substantially as herein set forth.
2. In a lever-jack having the lever Gr hinged to the stud-link F, within the openingE in the frame of. the jack, the lifting-pawl H and `rackbar O, substantially as herein set forth.
3. In combination with the holding-pawlD and lifting-pawl H, pivoted to the Swingin g 1ever Gr, the trip-block I, adapted to engage between the pawls,'substantially as herein setV forth.
In testimony whereof I have hereunto set my `hand in the presence of two subscribing witnesses.
JAooB o. JOYCE.
'Witnesses JOHN L. H. FRANK, THos. II. GRIDLAND.
Publications (1)
Publication Number | Publication Date |
---|---|
US271863A true US271863A (en) | 1883-02-06 |
Family
ID=2341099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US271863D Expired - Lifetime US271863A (en) | Lifting-jack |
Country Status (1)
Country | Link |
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US (1) | US271863A (en) |
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0
- US US271863D patent/US271863A/en not_active Expired - Lifetime
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