US477393A - Island - Google Patents

Island Download PDF

Info

Publication number
US477393A
US477393A US477393DA US477393A US 477393 A US477393 A US 477393A US 477393D A US477393D A US 477393DA US 477393 A US477393 A US 477393A
Authority
US
United States
Prior art keywords
latch
ladder
bar
pawl
ladders
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
Publication date
Application granted granted Critical
Publication of US477393A publication Critical patent/US477393A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C1/00Ladders in general
    • E06C1/02Ladders in general with rigid longitudinal member or members
    • E06C1/04Ladders for resting against objects, e.g. walls poles, trees
    • E06C1/08Ladders for resting against objects, e.g. walls poles, trees multi-part
    • E06C1/12Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic

Definitions

  • Nrrnn STATES '.frnivr OFFICE www Nrrnn STATES '.frnivr OFFICE.
  • This invention has reference to improvements in automatic latches, which may be secured to one of a pair of ladders, and is adapted to engage the rounds of the other ladder in order that the ladder carrying the latch may be held asan extension of the base-ladder.
  • the objects of the invention are to produce a latch of the nature described, which will be strong and durable in construction and effective in operation.
  • the invention consists in the peculiar ⁇ construction of the spring-operated thrust latchbar and of its co-operating pawl and their novel combination with the peculiar case in which they are pivoted, and by the use of which the effectiveness of their operation is increased, as will be more fully set forth hereinafter, and pointed out in the claims.
  • Figure 1 represents a longitudinal sectional view of a pair of ladders, showing the latch secured to one of the ladders and the latchbar engaging a round of the other ladder.
  • Fi g. 2 represents an enlarged view of the latch and of the case, partly broken away to show the construction of the thrust latch-bar and its pawl, also indicating in dotted lines the location of these parts when pushed inward by the rounds of a ladder when the latch is being moved downward.
  • Fig. 3 represents a vertical sectional view of the case to more clearly indicate the construction thereof, presentling, also, an edge view of the latch-bar and paw Similar letters and numbers of reference designate corresponding parts throughout.
  • A is a base-ladder
  • B an extension-ladder, which is generally of a width to freely move between the sideY frames of the base-ladder.
  • the guidehook C At the upper portion of the ladder A is sometimes secured the guidehook C, which prevents the extension-ladder from falling outward, and a rope D may be Serial No. 424,209. (No model.)
  • the ladder may be raised or lowered and is automatically locked to any round of the ladder A by the improved latch.
  • a case provided with a top or covcr 5 and a baseplate 6. These are of the general shape shown in the drawings to form a protecting -casc having a rearwardly-extending chamber into which the lower portion of the latch-bar may extend.
  • the cover 5 has a depending rim 7 extending around the back and ends thereof, but being dispensed with for the greater portion of the front edge to leave an opening through which the latch-bar and pawl may eX- tend.
  • the lower end of this cover 5 is also furnished with a spike 8 to prevent the lower end of the ladder B from slipping when removed from the ladder A.
  • the base-plate 6 is formed to fit inside the edge of the rim 7, and is furnished with the tubular posts 9 9 and 10, the upper ends of which are-cut away to form shoulders on which the cover may rest, and above these shoulders the posts extend through perforations in the cover and are expanded to Iirmly secure the base-plate and cover together.
  • the baseplate is also provided with the small post 11,
  • the latch-bar 14 is pivoted on the post 10 at the upperportion of the case and is thrown outward by the spring 15, encircling the post 10 and almost wholly contained within the cavity 16, formed in the under surface of the pivoted end of the latch-bar, against which one end operates while the other end is held by the rim of the case or by astop 15.
  • This bar extends downward and at its lower portion is furnished with the outwardly-curved jaw 17 and the inwardly-curved member 18, the lower end of which is curved outwardly to form the cam-hook 19 to engage and operate plane parallel to the cam-shoulder 13 of the pawl to throw said pawl upward and close the entrance to the jaw 17, this pawl, when thus thrown upward, also serving as a depressing finger to press the latch-bar back into the case as the latch moves down over the rounds of the ladder A.
  • the curved outer edge of the latch-bar rides over the rounds of the ladder and the pawl is allowed to drop back out of the way.
  • the pivoted pawl 12 having the cam-shoulder 13, adapted to be engaged by the cam-hook 19, as and for the purpose described.
  • a latch for extension-ladders the combination, with a case having the base-plate 6, furnished with the tubular posts 9 9 and 10 and the pivot 11, the cover 5, having the rim 7 and the spur 8 and perforations through which the ends of the posts 9 9 and 10 eX- tend and are secured, of the thrust latch-bar 14, pivoted on the post 10 and having a cavity 16, a spring 15, partially contained therein, the outwardly-curved jaw 17 and the member 18, forming the lower part of said latch-bar, the cam-hook 19, extending from the member 18, and the pawl 12, having the cam-shoulder 13, movable on the pivot 11, as and for the purpose described.

Landscapes

  • Ladders (AREA)

Description

(No Model.) v
J. A. WESTON. AUTOMATIC LATCH FOR EXTENSION LADDERS.
Patented June 21, 1892.
lll/l Wit" w:
.if www Nrrnn STATES '.frnivr OFFICE.
JOHN A. IVESTO, OF PROVIDENCE, RHODE ISLAND.
AUTOMATIC LATCH FOR EXTENSION-LADDERS.
SPECIFICATION forming part of Letters Patent No. 477,393, dated June 21, 1892.
Application filed March 8, 1892.
To all whom it may concern:
Be it known that I, JOHN A. VESTON, of the city of Providence, in the countyof Providence and State of Rhode Island, have invented certainnew and useful Improvements in Automatic Latches for Extension-Ladders; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.
This invention has reference to improvements in automatic latches, which may be secured to one of a pair of ladders, and is adapted to engage the rounds of the other ladder in order that the ladder carrying the latch may be held asan extension of the base-ladder.
The objects of the invention are to produce a latch of the nature described, which will be strong and durable in construction and effective in operation.
The invention consists in the peculiar` construction of the spring-operated thrust latchbar and of its co-operating pawl and their novel combination with the peculiar case in which they are pivoted, and by the use of which the effectiveness of their operation is increased, as will be more fully set forth hereinafter, and pointed out in the claims.
Figure 1 represents a longitudinal sectional view of a pair of ladders, showing the latch secured to one of the ladders and the latchbar engaging a round of the other ladder. Fi g. 2 represents an enlarged view of the latch and of the case, partly broken away to show the construction of the thrust latch-bar and its pawl, also indicating in dotted lines the location of these parts when pushed inward by the rounds of a ladder when the latch is being moved downward. Fig. 3 represents a vertical sectional view of the case to more clearly indicate the construction thereof, presentling, also, an edge view of the latch-bar and paw Similar letters and numbers of reference designate corresponding parts throughout.
In the drawings, A is a base-ladder, and B an extension-ladder, which is generally of a width to freely move between the sideY frames of the base-ladder. At the upper portion of the ladder A is sometimes secured the guidehook C, which prevents the extension-ladder from falling outward, and a rope D may be Serial No. 424,209. (No model.)
secured at one end to a lower round of the ladder B and pass through a pulley secured to an upper round of the ladder A. By the use of this rope the ladder may be raised or lowered and is automatically locked to any round of the ladder A by the improved latch.
In carrying out my invention I form a case provided with a top or covcr 5 and a baseplate 6. These are of the general shape shown in the drawings to form a protecting -casc having a rearwardly-extending chamber into which the lower portion of the latch-bar may extend. The cover 5 has a depending rim 7 extending around the back and ends thereof, but being dispensed with for the greater portion of the front edge to leave an opening through which the latch-bar and pawl may eX- tend. The lower end of this cover 5 is also furnished with a spike 8 to prevent the lower end of the ladder B from slipping when removed from the ladder A.
The base-plate 6 is formed to fit inside the edge of the rim 7, and is furnished with the tubular posts 9 9 and 10, the upper ends of which are-cut away to form shoulders on which the cover may rest, and above these shoulders the posts extend through perforations in the cover and are expanded to Iirmly secure the base-plate and cover together. The baseplate is also provided with the small post 11,
on which the pawl 12, having the cam-shoulder 13, is free to move in a that of the base-plate.
The latch-bar 14 is pivoted on the post 10 at the upperportion of the case and is thrown outward by the spring 15, encircling the post 10 and almost wholly contained within the cavity 16, formed in the under surface of the pivoted end of the latch-bar, against which one end operates while the other end is held by the rim of the case or by astop 15. This bar extends downward and at its lower portion is furnished with the outwardly-curved jaw 17 and the inwardly-curved member 18, the lower end of which is curved outwardly to form the cam-hook 19 to engage and operate plane parallel to the cam-shoulder 13 of the pawl to throw said pawl upward and close the entrance to the jaw 17, this pawl, when thus thrown upward, also serving as a depressing finger to press the latch-bar back into the case as the latch moves down over the rounds of the ladder A. When IOO l the latch is being moved upward, the curved outer edge of the latch-bar rides over the rounds of the ladder and the pawl is allowed to drop back out of the way.
By the construction thus shown and described I am able to produce a latch for extension-ladders which in itself forms a marketable artic-le, the parts of which cannot become loosened and lost, and the latch cannot be effected by the swelling of the ladder-frame to which it is attached, as the base-plate 6 is interposed between the movable parts of the latch and the frame of the ladder to which the same is Secured by the bolts 2O 20, extending through the tubular posts of the casing.
Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a latch for extension-ladders, the combination, with the spring-operated pivoted latch-bar 14, having a cavity 16 for containing the spriug,an outwardly-curved latching-jaw 17, an inwardly-curved member 18, and a calnliook 19 at the lower end of lthis member, of
the pivoted pawl 12, having the cam-shoulder 13, adapted to be engaged by the cam-hook 19, as and for the purpose described.
2. In a latch for extension-ladders, the combination, with a case having the base-plate 6, furnished with the tubular posts 9 9 and 10 and the pivot 11, the cover 5, having the rim 7 and the spur 8 and perforations through which the ends of the posts 9 9 and 10 eX- tend and are secured, of the thrust latch-bar 14, pivoted on the post 10 and having a cavity 16, a spring 15, partially contained therein, the outwardly-curved jaw 17 and the member 18, forming the lower part of said latch-bar, the cam-hook 19, extending from the member 18, and the pawl 12, having the cam-shoulder 13, movable on the pivot 11, as and for the purpose described.
In Witness whereof I have hereunto set my hand.
JOHN A. WVESTON.
Witnesses:
JOSEPH A. MILLER, HENRY J. MILLER.
US477393D Island Expired - Lifetime US477393A (en)

Publications (1)

Publication Number Publication Date
US477393A true US477393A (en) 1892-06-21

Family

ID=2546249

Family Applications (1)

Application Number Title Priority Date Filing Date
US477393D Expired - Lifetime US477393A (en) Island

Country Status (1)

Country Link
US (1) US477393A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3363721A (en) * 1966-03-11 1968-01-16 Petix Giuseppe Ladder construction
US20050192615A1 (en) * 2000-11-03 2005-09-01 Torre Roger D.L. Method and device for use in minimally invasive placement of intragastric devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3363721A (en) * 1966-03-11 1968-01-16 Petix Giuseppe Ladder construction
US20050192615A1 (en) * 2000-11-03 2005-09-01 Torre Roger D.L. Method and device for use in minimally invasive placement of intragastric devices

Similar Documents

Publication Publication Date Title
US477393A (en) Island
US1084034A (en) Rung-engaging clip.
US557134A (en) Island
US226702A (en) Key-ring
US480655A (en) Island
US63458A (en) Fea-ncis bakee
US478384A (en) Island
US181105A (en) Improvement in animal-traps
US1025824A (en) Safety-stirrup.
US109112A (en) Improvement in animal-traps
US477877A (en) Island
US476179A (en) Hubst
US495279A (en) stone
US463868A (en) William w
US902397A (en) Safety-stirrup.
US939064A (en) Curtain-hook.
US408628A (en) Edwin kelsey
US873425A (en) Sash-lock.
US997532A (en) Automatic locking mechanism.
US430163A (en) Trace and trace-chain supporter
US153716A (en) Improvement in extension-ladders
US898683A (en) Safety-stirrup.
US860209A (en) Animal-trap.
US719183A (en) Ladder.
US37965A (en) Improvement in hay-elevating forks