US3337001A

US3337001A - Extension ladders

Info

Publication number: US3337001A
Application number: US521973A
Authority: US
Inventors: Harold W Huska; James C Redman
Original assignee: Werner Co
Current assignee: Werner Co; RD Werner Co Inc
Priority date: 1966-01-20
Filing date: 1966-01-20
Publication date: 1967-08-22
Anticipated expiration: 1984-08-22

Description

Aug. 22, 135967 H HUSKA'ET AL 3,337,@l

EXTENSION LADDERS Filed Jan. 20, 1966 7&7 J3

L Qa 22 I 'VENTO 5 20/ 0 w- A e/@41 L I u 1 rm" 3 a ATTORNEY.

United States Patent ()fiice 3,337,001 Patented Aug. 22, 1967 3,337,001 EXTENSION LADDERS Harold W. Husk-a, Greenville, and James C. Redman,

Hadley, Pa., assignors to R. D. Werner Co., Inc., Greenville, Pa., a corporation of Pennsylvania Filed Jan. 20, 1966, Ser. No. 521,973 4 Claims. (Cl. 182-207) This invention relates to extension ladders and relates more particularly to cable means for use in hoisting the fly section of an extension ladder with respect to the base section thereof.

An object of this invention is to provide cable means of the type described which can be quickly and readily attached to or detached from the fly section to permit separation of the extension ladder sections.

Another object of this invention is to provide cable means of the above type completely clear of the ladder rungs of the extension ladder so that the entire width of said rungs is unencumbered by the hoist means.

Yet another object of this invention is to provide improved means permanently attached to the fly section to which the cable means of this invention may be detachably attached.

A still further object of this invention is to provide improved mounting for the cable means of this invention whereby the cable means is mounted on one side of one of the extension ladder sections.

A further object of this invention is to provide an improved hoist means for an extension ladder which is simple in construction, composed of but few parts, readily assembled and highly eflicient in use.

These and other objects of this invention will become more readily apparent from a purview of the following description and the attached drawings, in which drawings:

FIG. 1 is a side plan view of the assembly of the extension ladder of this invention comprising base and fly sections having the cable means of the invention attached thereto;

FIG. 2 is a front elevational view of the ladder of this invention a portion of the same being broken away and a portion having dotted lines for clarification of underlying parts;

FIG. 3 is a sectional view taken from the line 3-3 of FIG. 1;

FIG. 4 is a perspective view of the fly attachment bracket of FIG. 1.

Referring now to the drawings, in all of which like parts are designated by like reference characters, an extension ladder is generally indicated at which comprises a base section 20 and a fly section 40. The base section 20 comprises generally parallel, laterally spaced side rails 21 joined together by transverse, uniformly spaced rungs 22. The fly section 40 similarly comprises generally parallel, laterally spaced side rails 41 joined together by transverse, uniformly vertically spaced rungs 42.

The base and fly sections 20 and 40 may be made of any suitable material, such as wood, fiberglass, metal, such as aluminum, and slidably attached in any preferred manner to prevent forward and rearward separation thereof.

The ladder as shown is preferably front loaded in the manner disclosed in copending application of James C. Redman, assigned to the assignee of the instant application, Ser. No. 504,601 filed, Oct. 24, 1965.

It will be apparent by reference to the application referred to above that the brackets used for slidably mounting the fly section on the base, and shown at 29, 29, are mounted on the upper end of the base section and on the lower end of the fly section, respectively. Each said guide bracket comprises a flat base portion 30, rigidly secured as by rivets 31 flatwise against the web 43 of the side rail of its associated ladder section and each guide bracket terminates in a projecting hook end 24 which is adapted to overlap a flange of one section and an adjacent flange of the other section.

Additionally thereto the fly section shown in this invention includes a guide member 49 preferably similarly formed to the guide brackets 29, 29 although other forms might be employed. As shown the member 49 has a flat base portion 50 secured byrivets 51 to the web 43 of the fly section 40 and positioned above the lower guide bracket 29 on the fly section; the hook end 54 of such guide bracket 49 is provided with a notch 55 in an in.- wardly directed leg 56 of said hook. The endless rope or cable is generally indicated at 60 in FIGS. 1 and 2 and comprises an endless rope or cable 61 having 'one end of the said rope secured as by conventional clips or clamping means 62 to an opposite end portion 63 of said rope a short distance inwardly of one end 64 of said rope, which end 64 is shown as formed into a loop or eye 64' although other forms may be employed. As shown the loop or eye 64' is secured by means of the notch 55 to the bracket 50.

The rope passes upwardly over a pulley 70, secured by means of a generally S-shaped mounting bracket 71 and rivets 72 to the web 23 of the base section 20, as best shown in FIG. 3. The rope passes downwardly therefrom on either side of the rung joints and traverses a pulley secured to the web of the side rail of the base in close proximity to the lowermost portion thereof. The mounting bracket 81, for the pulley 80, similarly to that shown at 71, is secured as by rivets 82 to the web 23 of the base section. The endless rope or cable 61, as illus trated, is permanently aflixed by means of the pulleys to one side rail of the base section of the front loading and stacked extension ladder shown, and the dangling free end of this rope is easily and quickly looped over the leg 56 and the eye thereof seated in the notch 55 whereby after the fly section is stacked on the base section carrying the cable and the ladder sections assembled as shown, this end of the endless rope is fastened to the fly and the fly section is thereafter hoisted or lowered by either manipulating the endless rope or cable or by simply pushing up or pulling down on the fly section. The parts may be readily disengaged one from the other by simply removing the end of the rope from the mounting bracket 49.

Since the entire cable means is carried by the base section when the ladder is not in use as an extension ladder, and the rope is equipped with a member which can be readily attached to a fitting aflixed permanently to the bottom section of the fly section, it will be obvious that with this design of cable mounting, the cable works within the envelop dimensions of the base section of the ladder when the side rail is channeled and the flanges thereof face outward.

The placement of the cable or rope means on the out side of the ladder is particularly desirable from a safety standpoint in that the entire width of the ladder rungs, as illustrated herein, is free for use by the person climbing the ladder.

Although we have described this invention in connection with a preferred embodiment thereof, it will be apparent that numerous and extensive departures may be made therefrom without, however, departing from the spirit of this invention or the scope of the appended claims.

What we claim is:

1. An extension ladder of the type described having a base section and a longitudinally slidable fly section, each said section comprising channel shaped side rails having flat webs connected by rungs and laterally projecting, parallel flanges carried at the edges of said. webs, the side rails of said fly section overlying the side rails of said base section, endless cable means mounted on one Web of one side. rail ofsaidbase section and between the flanges of said one side rail, connector means carried by one side rail of the fly section overlying said one side rail of the base section, said connector means having a portion projecting into the channel of said one side rail of the base section adapted to detachably secure the said cable means joined adjacent its ends, said endless cable means having a depending portion extending therefrom adapted to be detachably secured to said connector means, said connector means secured to the web of said one rail of said fly section, said projecting portion extending around the adjacent flanges of said one side rail of said base section and said one side rail of said fly section and projecting into the channel of said one side rail of said base section.

3. An extension ladder of the type claimed in claim 2 wherein the said depending portion of said endless cable means is provided with an eye and the said projecting portion of said connector means is provided with an opening therein, said opening detachably receiving said eye.

4. An extension ladder as claimed in claim 2 wherein the entire endless cable means and depending portion thereof is mounted on a single rail of the base section when the fly and base ladder sections are disassembled.

References Cited UNITED STATES PATENTS 75,052 3/ 1 868 Pine 182-209 349,370 9/1886 Springer 182212 375,250 12/1887 Bailey 182208 2,944,625 7/ 1960 Shore 182-209 2,957,543 10/1960 Larson 18222'8 FOREIGN PATENTS 198,920 6/1923 Great Britain. 204,529 10/ 1923 Great Britain.

REINALDO P. MACHADO, Primary Examiner.

Claims

1. AN EXTENSION LADDER OF THE TYPE DESCRIBED HAVING A BASE SECTION AND A LONGITUDINALLY SLIDABLE FLY SECTION, EACH SAID SECTION COMPRISING CHANNEL SHAPED SIDE RAILS HAVING FLAT WEBS CONNECTED BY RUNGS AND LATERALLY PROJECTING, PARALLEL FLANGES CARRIED AT THE EDGES OF SAID WEBS, THE SIDE RAILS OF SAID FLY SECTION OVERLYING THE SIDE RAILS OF SAID BASE SECTION, ENDLESS CABLE MEANS MOUNTED ON ONE WEB OF ONE SIDE RAIL OF SAID BASE SECTION AND BETWEEN THE FLANGES OF SAID ONE SIDE RAIL, CONNECTOR MEANS CARRIED BY ONE SIDE RAIL OF THE FLY SECTION OVERLYING SAID ONE SIDE RAIL OF THE BASE SECTION, SAID CONNECTOR MEANS HAVING A PORTION PROJECTING INTO THE CHANNEL OF SAID ONE SIDE RAIL OF THE BASE SECTION ADAPTED TO DETACHABLY SECURE THE SAID CABLE MEANS TO SAID ONE SIDE RAIL OF THE SAID FLY SECTION WHEN SAID FLY SECTION IS SLIDABLY MOUNTED ON SAID BASE SECTION, THE FLY SECTION BEING HOISTED OR LOWERED BY THE ENDLESS CABLE MEANS CARRIED BY SAID BASE SECTION AND SECURED TO THE SAID FLY SECTION.