US140578A - Improvement in step-ladders - Google Patents
Improvement in step-ladders Download PDFInfo
- Publication number
- US140578A US140578A US140578DA US140578A US 140578 A US140578 A US 140578A US 140578D A US140578D A US 140578DA US 140578 A US140578 A US 140578A
- Authority
- US
- United States
- Prior art keywords
- improvement
- ladders
- rods
- bars
- tie
- 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
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/08—Special construction of longitudinal members, or rungs or other treads
Definitions
- a a are the string-pieces
- b b are the tie-rods, the end of which are, respectively, secured in bars a.
- c c are short pieces which serve to unite the respective eX- tremities of bars a, and form a broader bearing.
- d d are diagonal braces or rods, which are secured in bars a, as shown, and which serve as stays, by which the compressive strain upon the upper and the tensile strain upon the lower bar are economized Vfor their reciprocal support.
Description
UNITED STATES PATENT OFFICE.
CHARLES FRIZELL, OF BOSTON, MASSACHUSETTS.
IMPROVEMENT IN STEP-LADDERS.
Specification forming part of Letters Patent No. 140,578, vdated July 8, 1873 5 application filed May 29, 1873.
-tie-rods'which unite the same, by which the sides are greatly strengthened, Without materially increasing their weight.
The accompanying drawing represents a side elevation of the ladder with this improvement applied.
In the drawing, a a are the string-pieces,
and b b are the tie-rods, the end of which are, respectively, secured in bars a. c c are short pieces which serve to unite the respective eX- tremities of bars a, and form a broader bearing. d d are diagonal braces or rods, which are secured in bars a, as shown, and which serve as stays, by which the compressive strain upon the upper and the tensile strain upon the lower bar are economized Vfor their reciprocal support.
What I cla-im as my invention is- The diagonal rods d, in combination with bars a a and tie-rods b, substantially as and for the purposes specified.
CHARLES FRIZELL.
Witnesses:
EBEN HU'rcHINsoN, T. W. PORTER.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US140578A true US140578A (en) | 1873-07-08 |
Family
ID=2209992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US140578D Expired - Lifetime US140578A (en) | Improvement in step-ladders |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US140578A (en) |
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0
- US US140578D patent/US140578A/en not_active Expired - Lifetime
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