US107822A - Improvement in extension ladders - Google Patents
Improvement in extension ladders Download PDFInfo
- Publication number
- US107822A US107822A US107822DA US107822A US 107822 A US107822 A US 107822A US 107822D A US107822D A US 107822DA US 107822 A US107822 A US 107822A
- Authority
- US
- United States
- Prior art keywords
- section
- improvement
- extension ladders
- secured
- cords
- 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
- 210000001364 Upper Extremity Anatomy 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003028 elevating Effects 0.000 description 2
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/06—Securing devices or hooks for parts of extensible ladders
Definitions
- the cords p p will be raised by the pulleys q qwhen the section B is elevated, so thata corresponding elevation of the section (l must necessarily follow.
- the section C is furnished at its upper extremities with wheels or rollers, s s, whchare'intended to rest against the 'wall -of a building when the ladder is being extended, and thus ease ,olf ,and reduce the friction caused by the rubbing ofthe said section against the wall.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Emergency Lowering Means (AREA)
Description
then either secured to the section B close to its lower end, or are passed around' pulleys n u of the same, and secured to each other.
With this arrangement of tackle, the nierewinding of the cords upon the drum 'i will-have the effect of extending or elevating the section B to any required extent, and, in order to extend theA section C simultaneously with the said section B, ,two additional cords, p p, are required. These are secured to the-top of the section A, are passed over pulleys q q at the top of the section B, and are conducted. downward through the grooves d of the latter to a point close to the bottom of the section C, to which they are secured, or are passed around pulleys r, and secured together in the same manner as the cords k 1a.-
The cords p p will be raised by the pulleys q qwhen the section B is elevated, so thata corresponding elevation of the section (l must necessarily follow.
'.lhe catches 71, may, if desired,be employed in connection with the ladder last described, but they are n ot absolutely necessary, as the pawl and ratchet vof the drum t' will preventthe accidental descent of the sections.
The section C is furnished at its upper extremities with wheels or rollers, s s, whchare'intended to rest against the 'wall -of a building when the ladder is being extended, and thus ease ,olf ,and reduce the friction caused by the rubbing ofthe said section against the wall.
The friction between the several sectonsmay also be reduced, and the extending of the ladder facilitated, by the employment of` small wheels, t t, hung' to cross-rods t t" of the sections Aand B, and adapted to ways on the latter section, and on the upper section O.'
Claim.
witnesses. I
4JOHN WILLIAM SCOTT.
Witnesses:
WILLIAM FALLS, l HARRY SMITH.'
Publications (1)
Publication Number | Publication Date |
---|---|
US107822A true US107822A (en) | 1870-09-27 |
Family
ID=2177296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US107822D Expired - Lifetime US107822A (en) | Improvement in extension ladders |
Country Status (1)
Country | Link |
---|---|
US (1) | US107822A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090306704A1 (en) * | 2005-01-03 | 2009-12-10 | Eric Johnson | Spiral shaped filter |
-
0
- US US107822D patent/US107822A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090306704A1 (en) * | 2005-01-03 | 2009-12-10 | Eric Johnson | Spiral shaped filter |
US20100324590A1 (en) * | 2005-01-03 | 2010-12-23 | Eric Johnson | Methods for maintaining a filtering device within a lumen |
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