US1461952A - Extension ladder - Google Patents

Extension ladder Download PDF

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Publication number
US1461952A
US1461952A US558931A US55893122A US1461952A US 1461952 A US1461952 A US 1461952A US 558931 A US558931 A US 558931A US 55893122 A US55893122 A US 55893122A US 1461952 A US1461952 A US 1461952A
Authority
US
United States
Prior art keywords
sides
rungs
ladder
bolt
wire
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
Application number
US558931A
Other languages
English (en)
Inventor
George H Walchli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KANT BREAK LADDERS Inc
KANT-BREAK LADDERS Inc
Original Assignee
KANT BREAK LADDERS Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DEK85873D priority Critical patent/DE396735C/de
Application filed by KANT BREAK LADDERS Inc filed Critical KANT BREAK LADDERS Inc
Priority to US558931A priority patent/US1461952A/en
Application granted granted Critical
Publication of US1461952A publication Critical patent/US1461952A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E06C7/082—Connections between rungs or treads and longitudinal members
    • E06C7/088—Connections between rungs or treads and longitudinal members with tie rods parallel to the rungs
    • 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
    • E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
    • E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
    • E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/10—Reinforcements for ladders

Definitions

  • My invention relates to improvements in ladder construction and more particularly to improvements in extension ladders of the kind, that is used-in erecting, roofing. and painting.- houses, and 'the mainobject of the invention is to provide a ladderthat isv comparatively light but has at theusa-me time ample strength. for the usev for which it is intended.
  • the advantage claimed for this construction is accordingly this, that the sides are prevented from splitting, bending and breaking, as well as from spreading, and the rungs from breaking.
  • Figure 1 shows a perspective view of an extension ladder as erected against a wall
  • Fig. 2 is a fragmentary side view of the same
  • Fig. 3 is a longitudinal section along line 3-3 of Fig. 2;
  • Fig. 4 is a horizontal section along line 4- 1 of Fig. 2;
  • Fig. 5 is a longitudinal section along line 55 of Fig. 3, and
  • Fig. 6 is a perpendicular section along line 66 of Fig. 1.
  • the ladder consists of a pair of sides or uprights 10 preferably of wood and connected by means of a number of rungs 11 also lnade of wood.
  • the reference numeral 12 indicates the extension part of the ladder which, in the usual manner, is intended to slide up and down the principal ladder in guides 13 and held in adjusted position by means of dogs 14.
  • the upper ladder 12 is hoisted on the main ladder by means of a tackle and block device 15 of the usual construction.
  • the rungs 11 are made in two parts, that is to say, they are split along their longitudinal axis, as
  • a sleeve 19 sur rounds-each rung to keep the halves thereof together and to prevent displacement there of and each rung is provided with a central bore through which a bolt 20: runs
  • This bolt is preferably made of iron wire and threadedatone or both ends, as it 21, or it may. have ahead 22 at the other end.
  • a nut23ancl a washer 24 the bolt 20, rungs 11 and two sides 10 are held firmly together, and in order that the outer faces of the sides 10 may be without. obstructions the headsand nuts are: countersunk in the wood, as at 25.
  • I provide a narrow groove 26 running the entire length of the sides and: also across the top end thereof.
  • a continuous wire 27 bent in U-shape, so as to be embedded in the grooves 26 both along the edges and the top of each side 10.
  • the lower ends of the wire 27 terminate each with a loop 28 and these two loops are positioned opposite each other in the edges of the sides, so that they may be held securely therein by means of a cross bolt 29 tightened by means of a nut 30.
  • Bracing bolts 31 are also provided for connecting the two parallel lengths of the wire 27 and these bolts are preferably provided with a hook 131 at one end engaging one side of the wire and a bent washer 32 at the opposite end where a nut 33 draws the parts together, the bolts 31 running through the body of each side 10, as best seen in Fig. 4.
  • the U-shaped wire 27 is securely held in the grooves provided therefor and it will be readily understood that this construction considerably strengthens the sides of the ladder, so that the latter may be lightly constructed.
  • the reinforced rungs these will not only be strengthened against breaking or bending but the sides will be prevented from spreading when a heavy load is placed on the rungs.
  • extension ladders may be constructed in this manner but ordinary single ladders and step ladders may also be strengthened in the same way.
  • the splitting of the rungs as described above is made for simplifying the construction, but at times it might be preferable, particularly if suitable wood is available that the rungs be made in one piece and pro- I vided with a central bore for insertion of the bolts 20.
  • the sleeves 19 are very essential for increasing the strength oi the rungs.
  • the sleeves may be shrunk in place, or if made open, riveted or nailed around the rungs.
  • a ladder having a pair of wooden sides and wooden rungs between said sides with their ends countersunk therein, said sides being provided with grooves along their edges and across their upper ends, a
  • a'ladder having a pair of wooden sides and'wooden rungs between said sides with their ends countersunk therein, each of said rungs being split along an axial plane and provided with a central bore, a bolt inserted in said bore, and means drawing said bolt, rung and sides'togethen'said sides! being provided with grooves along their edges and across their upper ends, a continuous wire embedded in the grooves, of each side and spaced bracing bolts through said sides provided with hooked ends engaging with the wire.
  • a ladder having a pair of wooden sides and wooden rungs between said sides with their ends countersunk therein, each of said rungs being split along an axial plane and provided with a central bore, a bolt inserted insaid bore, and means drawing said bolt, rung and sides together, a sleeve adapted to surround'and hold together the two parts of each rung, said sides being provided with grooves along their edges and across their upper ends, a continuous wire embedded'in said grooves and spaced bracing bolts through said sides, a hook formed at one end of each bolt, a nut'threaded on the other end thereof and a hooked washer under saidnut, said hooks engaging with oppositely situated portions of said continuous wire.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
US558931A 1922-05-06 1922-05-06 Extension ladder Expired - Lifetime US1461952A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEK85873D DE396735C (de) 1922-05-06 Holzleiter mit Metallverstaerkungen
US558931A US1461952A (en) 1922-05-06 1922-05-06 Extension ladder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEK85873D DE396735C (de) 1922-05-06 Holzleiter mit Metallverstaerkungen
US558931A US1461952A (en) 1922-05-06 1922-05-06 Extension ladder

Publications (1)

Publication Number Publication Date
US1461952A true US1461952A (en) 1923-07-17

Family

ID=34740350

Family Applications (1)

Application Number Title Priority Date Filing Date
US558931A Expired - Lifetime US1461952A (en) 1922-05-06 1922-05-06 Extension ladder

Country Status (2)

Country Link
US (1) US1461952A (de)
DE (1) DE396735C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656087A (en) * 1952-04-04 1953-10-20 Sharrock William Ladder construction
US3169603A (en) * 1963-02-21 1965-02-16 Sr John J Amic Access ladder
US3365023A (en) * 1966-07-06 1968-01-23 Thomas R. Nagle Ladder extension and mounting means therefor
US4210224A (en) * 1979-01-05 1980-07-01 Kummerlin Nikolaus A Longitudinally variable ladder
US4697305A (en) * 1985-02-14 1987-10-06 Harold R. Wing Release mechanism for locking hinge for multi-positioned ladder
US20210079727A1 (en) * 2019-09-12 2021-03-18 Werner Co. Interlocking Ladder Stack and Method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656087A (en) * 1952-04-04 1953-10-20 Sharrock William Ladder construction
US3169603A (en) * 1963-02-21 1965-02-16 Sr John J Amic Access ladder
US3365023A (en) * 1966-07-06 1968-01-23 Thomas R. Nagle Ladder extension and mounting means therefor
US4210224A (en) * 1979-01-05 1980-07-01 Kummerlin Nikolaus A Longitudinally variable ladder
US4697305A (en) * 1985-02-14 1987-10-06 Harold R. Wing Release mechanism for locking hinge for multi-positioned ladder
US20210079727A1 (en) * 2019-09-12 2021-03-18 Werner Co. Interlocking Ladder Stack and Method
US11834908B2 (en) * 2019-09-12 2023-12-05 Werner Co. Interlocking ladders and components thereof

Also Published As

Publication number Publication date
DE396735C (de) 1924-06-06

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