US138977A - Improvement in step-ladders - Google Patents
Improvement in step-ladders Download PDFInfo
- Publication number
- US138977A US138977A US138977DA US138977A US 138977 A US138977 A US 138977A US 138977D A US138977D A US 138977DA US 138977 A US138977 A US 138977A
- Authority
- US
- United States
- Prior art keywords
- ladders
- ladder
- legs
- improvement
- wright
- 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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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
Definitions
- Step-Ladders of which the following is a specification:
- my invention relates to an improvement in step-ladders; and consists in attaching the braces or legs to the brackets by means of socket-joints, allowing each leg a free and independent movement, so that they can adjust themselves to any inequality of the earth, as will be more fully set forth hereafter.
- Figure 1 represents a side elevation of my ladder.
- Fig. 2 is a rear view of the same.
- a represents an ordinary step-ladder, provided with the brackets c, to which the legs 0 are attached by means of the socket-joints i.
- the legs have been merelyhinged to the ladder, so as to swing back and forth, and have been rigidly braced together; and as long as the ladder is used upon perfectly flat even surfaces, they answer every purpose; but as soon as the ladder is moved upon uneven ground, the legs being braced rigidly together, only one will touch the ground; or, if both legs rest upon the ground, then only one side of the ladder will touch it, making it unsafe to use it.
- a step-ladder having its legs or braces secured to it by means of joints, so as to allow each leg a limited, free, and independent movement, substantially as set forth.
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- Ladders (AREA)
Description
S. WRIGHT.
Step-Ladders. Nc .138,977. Pamted ma mmms WJYNEEEES, )Sr 3 INVENUR.
ad/QM AM PHOTD-UTHOGIMPHIC C0 N. m OSBORNEPROCESS UNITED STATES PATENT OFFICE.
SAMUEL WRIGHT, OF HILLSBOROUGH, MISSOURI.
IMPROVEMENT IN STEP-LADDERS.
Specification forming part of Letters Patent No. 138,977, dated May 13, 1873; application filed March 11, 1873.
To all whom it may concern:
Be it known that I, S. WRIGHT, of Hillsborough, county of Jefferson and State of Missouri, have invented certain new and useful Improvements in Step-Ladders, of which the following is a specification:
The nature of my invention relates to an improvement in step-ladders; and consists in attaching the braces or legs to the brackets by means of socket-joints, allowing each leg a free and independent movement, so that they can adjust themselves to any inequality of the earth, as will be more fully set forth hereafter.
Figure 1 represents a side elevation of my ladder. Fig. 2 is a rear view of the same.
a represents an ordinary step-ladder, provided with the brackets c, to which the legs 0 are attached by means of the socket-joints i.
Heretofore the legs have been merelyhinged to the ladder, so as to swing back and forth, and have been rigidly braced together; and as long as the ladder is used upon perfectly flat even surfaces, they answer every purpose; but as soon as the ladder is moved upon uneven ground, the legs being braced rigidly together, only one will touch the ground; or, if both legs rest upon the ground, then only one side of the ladder will touch it, making it unsafe to use it. In order to overcome this difficulty, I secure the legs through the brackets to the cross-bar Z, either by the socket-joint i, as shown, or by a ball and socket, or any other suitable joint, which will allow each leg a limited, free, and independent movement, so that they will readily adjust themselves to any inequality of surface, as shown in Fig. 2. Then it is only necessary to place the ladder firmly on the ground, and the legs can be arranged to brace it as firmly as though the surface was perfectly fiat and even.
Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-
A step-ladder, having its legs or braces secured to it by means of joints, so as to allow each leg a limited, free, and independent movement, substantially as set forth.
In testimony that I claim the foregoing as 7 my invention, I hereunto affix my signature this 5th day of March, 1873.
SAMUEL WRIGHT.
Witnesses:
T. N. DONNELL, W. MITCHELL.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US138977A true US138977A (en) | 1873-05-13 |
Family
ID=2208391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US138977D Expired - Lifetime US138977A (en) | Improvement in step-ladders |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US138977A (en) |
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0
- US US138977D patent/US138977A/en not_active Expired - Lifetime
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