US154989A - Improvement in lifting-jacks - Google Patents
Improvement in lifting-jacks Download PDFInfo
- Publication number
- US154989A US154989A US154989DA US154989A US 154989 A US154989 A US 154989A US 154989D A US154989D A US 154989DA US 154989 A US154989 A US 154989A
- Authority
- US
- United States
- Prior art keywords
- pawl
- jacks
- slots
- ratchet
- lifting
- 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
- 210000002105 tongue Anatomy 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 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 the pawl of such jacks; and its objects are, first, to substitute the weight of the pawl, sliding in inclined slots, grooves, or guides, for the elastic spring usually employed to press it against the teeth of the ratchet-bar; and, second, to obtain greater strength by dividing the load among several teeth of the pawl and ratchet-bar, instead of supporting it all on one tooth, as is commonly done.
- Figure 1 of the accompanying drawings is a vertical section of so much of a jack as is necessary to show my improvements and Fig.
- FIG. 2 is a modification of the same, in which the pins and slots of Fig. 1 are exchanged for the tongue and groove in Fig. 2.
- A is the pawl, having teeth that engage with the teeth of the ratchet-bar B.
- D D are slots in the frame of the jack, inclined to the axis of the ratchet-bar at the angle of about forty-five degrees, in which slots move the pins O O of the pawl A.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Preliminary Treatment Of Fibers (AREA)
Description
l. 0. JOYCE.
Lifting-lacks. I No 154989.- 7 Patented S Pt'.15,1874.
HIC GD. PNOTO'LITH-3S& 4i PARK PLACE,N.Y. v
UNITED STATES PATENT OEEIoE.
JAOOB O. JOYCE, OF OABLISLE STATION, OHIO.
IMPROVEMENT IN LlFTlNG-JACKS.
Specification forming part of Letters Patent No. 154,989, dated September 15, 1874 application filed March 16, 1874.
To all whom it may concern.-
Be it known that I, JACOB O. JoYcE, of Oarlisle Station, Warren county, Ohio, have in vented certain Improvements in Lever-Jacks, of which the following is a specification:
My invention relates to the pawl of such jacks; and its objects are, first, to substitute the weight of the pawl, sliding in inclined slots, grooves, or guides, for the elastic spring usually employed to press it against the teeth of the ratchet-bar; and, second, to obtain greater strength by dividing the load among several teeth of the pawl and ratchet-bar, instead of supporting it all on one tooth, as is commonly done.
Figure 1 of the accompanying drawings is a vertical section of so much of a jack as is necessary to show my improvements and Fig.
2 is a modification of the same, in which the pins and slots of Fig. 1 are exchanged for the tongue and groove in Fig. 2.
Referring to Fig. 1, A is the pawl, having teeth that engage with the teeth of the ratchet-bar B. D D are slots in the frame of the jack, inclined to the axis of the ratchet-bar at the angle of about forty-five degrees, in which slots move the pins O O of the pawl A.
The operation is seen at a glance. When the ratchet-bar is raised, its teeth crowd or slide the pawl up the inclined slots out of the way, so as to allow it to pass, until it has traveled the length of a tooth, when the weight of the pawl causes it to fall back into the next tooth below, ready to hold the ratchet-bar at the point gained, ready for another lift, and so on.
In Fig. .2, instead of slots D D, there is a tongue, D, on each side of the pawl, with corresponding grooves in the frame of the jack, in'which the said tongues move or the tongues may be on the frame, with the grooves. in the pawl, the tongues and grooves performing the same oflice that the pins and slots do in the form of construction shown in Fig. 1.
Other modifications, involving the same principle of operation, may be possible; but I prefer the construction represented in Fig. 1, at the same time not limiting myself strictly to that, but claiming any equivalent arrangement by which the same objects are accomplished in substantially the same manner.
I claim as my invention 1. A pawl for lever jack with two or more teeth, and adapted to move in inclined slots, grooves, or guides formed in the frame, substantially as described.
2. The combination of the pawlA with its pins O 0, slots D D, and ratchet-bar B, substantially as described.
J. O. JOYCE.
Witnesses:
S. A. GoonwIN, FRANK I. J OYCE.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US154989A true US154989A (en) | 1874-09-15 |
Family
ID=2224399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US154989D Expired - Lifetime US154989A (en) | Improvement in lifting-jacks |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US154989A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040045954A1 (en) * | 2002-09-10 | 2004-03-11 | Lehman Timothy M. | Cover system for heating unit |
-
0
- US US154989D patent/US154989A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040045954A1 (en) * | 2002-09-10 | 2004-03-11 | Lehman Timothy M. | Cover system for heating unit |
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