US138234A - Improvement in extension step-ladders - Google Patents
Improvement in extension step-ladders Download PDFInfo
- Publication number
- US138234A US138234A US138234DA US138234A US 138234 A US138234 A US 138234A US 138234D A US138234D A US 138234DA US 138234 A US138234 A US 138234A
- Authority
- US
- United States
- Prior art keywords
- ladders
- improvement
- extension step
- extension
- ladder
- 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
- 230000006872 improvement Effects 0.000 title description 4
- 238000010276 construction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/14—Ladders capable of standing by themselves
- E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
- E06C1/20—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles
- E06C1/22—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles with extensible, e.g. telescopic, ladder parts or struts
Definitions
- Fig. 2 is an enlarged and detached view of my improved latch.
- This invention relates to an improvement in the construction of extension step-ladders, and is designed as an improve ment upon the extension step-ladder secured to me by Letters Patent dated the 5th day of May, A. D. 1868, to which Letters Patent reference may be had.
- A represents the ladder provided with two-part steps, and with the extension parts operating in grooves, as described in the above-named Letters Patent.
- the plate B carrying a latch, a, so arranged that as the extension is moved upward the inner end of the latch will rest against the outer face of the extension and enter holes I) therein provided for that purpose, and hold the extension at the desired point.
- 0 is a metallic bracket cast generally in the form shown, which need not be. particularly described, as it is not claimed herein.
- K is a cord, the two ends of which are secured to the legs F or to the braces thereof, while the center, forming a loop, is secured, removably, to a hook, it, secured to the under side of one of the steps, for the purpose of preventing the ladder from spreading when in use.
- cord K in combination with the series of hooks h h, attached to the steps of the ladder A, and the extensible legs F G, substantially as described.
Landscapes
- Ladders (AREA)
Description
L. B. COVERT.
Extension Step-Ladders. N0. 138,234. Patented April 29, 1873,
Mme/S8618 Inventor 5 Km /4 .ewa
UNITED STATES PATENT OEEIOE.
, LEWIs B. COVERT, OF DETROIT, MICHIGAN.
IMPROVEMENT m EXTENSION STEP-LADDERS.
Specification forming part of Letters Patent No. 138,234, dated Ap1il29, 1873; application filed October 28, 1872.
curate description thereo t, reference being had to the accompanying drawing and to the letters of reference marked thereon and being a part of this specification, in which- Figure] is a side elevation of the ladder,
and Fig. 2 is an enlarged and detached view of my improved latch.
Like letters refer to like parts in each figure.
The nature of this invention relates to an improvement in the construction of extension step-ladders, and is designed as an improve ment upon the extension step-ladder secured to me by Letters Patent dated the 5th day of May, A. D. 1868, to which Letters Patent reference may be had.
In the drawing, A represents the ladder provided with two-part steps, and with the extension parts operating in grooves, as described in the above-named Letters Patent. To the top of the outside pieces of the ladder is fastened the plate B, carrying a latch, a, so arranged that as the extension is moved upward the inner end of the latch will rest against the outer face of the extension and enter holes I) therein provided for that purpose, and hold the extension at the desired point. 0 is a metallic bracket cast generally in the form shown, which need not be. particularly described, as it is not claimed herein. K is a cord, the two ends of which are secured to the legs F or to the braces thereof, while the center, forming a loop, is secured, removably, to a hook, it, secured to the under side of one of the steps, for the purpose of preventing the ladder from spreading when in use.
What I claim as my invention, and desire to secure by Letters Patent, is-- 1. In combination with the ladder A and extension E thereof, the plate B and latch a, substantially as described, and for the purposes set forth.
2. The cord K, in combination with the series of hooks h h, attached to the steps of the ladder A, and the extensible legs F G, substantially as described.
LEWIS B. COVERT.
Witnesses:
Tnos. S. SPRAGUE, H. S. SPRAGUE.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US138234A true US138234A (en) | 1873-04-29 |
Family
ID=2207648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US138234D Expired - Lifetime US138234A (en) | Improvement in extension step-ladders |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US138234A (en) |
-
0
- US US138234D patent/US138234A/en not_active Expired - Lifetime
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