US1486289A - Ladder - Google Patents

Description

W. P. GREEN Much l1 LADDER Fild April z. 1925 William .P. Green;

ATTORNEY WITNESS:

Patented Mar. 11, 1924.

UNITED STATES WILLIAM P. GREEN, 0F SAN FRANCISCO, CALIFORNIA.

LADDER.

Application filed April 2,

I '0 all whom 2'25 may concern: v Be it known that I, WILLIAM P. GREEN, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Ladders, of which the following is a specification.

lhis invention relates to ship ladders and contemplates a novel construction with a View of providing an exceedingly strong and durable ladderwhich can not be easily impaired.

The nature and advantages of the invention will be better understood when the following detailed description is read in connection with the accompanying drawing, the invention residing in the. construction, combination'and arrangement of parts as claimed.

In the drawings forming-part of this application, like numerals of reference indicate similar parts in the several views, and wherein:

Figure 1 is a fragmentary front elevation of a ladder constructed in accordance with the present invention.

Figure 2 is a side elevation.

Figure 3 is a sectional view taken on the line 33 of Figure 2.

Figure 4 is a transverse sectional view through one side of the ladder taken immediately above one of the clamps 20.

Referring to the drawing in detail, it will be noted that the ladder is made up of two sides which are connected together by the rungs 10. Each side embodies a plurality of spaced sections, and the corresponding sections of the respective sides are connected together by at least two of the rungs 10. Each section includes a plate 11 of substantially elliptical contour, but I desire to have it understood that the'shape and size of these sections may be varied without departing from the spirit of the invention. Each section 11 is provided with spaced openings 12 to receive the reduced end portions 13 of the rungs 10, the latter being efiectively secured to the corresponding sections of the respective sides of the ladder by dowel pins 14- as shown. These pins 14 are passed through transverse openings formed in each section at a right angle to the openings 12, the openings for the dowelapins opening at the opposed edges of the section 11 Each sectlon is provided with a rope receiving groove 15 which communicates with the openings for 1923. Serial No. 629,474.

the reception of the dowel pins. Consequently, when the rope 16 is positioned within the groove 15 of each section, it not only serves to flexibly connect allof the sections together, but further serves to hold the dowel pins in eifective contact with the adacent rungs of the ladder, preventing casual loss or separation of these pins from the sections.

For each side of the ladder, I make use of a single length of rope, the intermediate portion of which is formed to provide a loop 17, the loop receiving a metallic eye 18 to afford the desired strength and rigidity. The parallel portions of the rope 19 are held in contacting engagement with each other for an appreciable portion of their length immediately beneath the loop 17 and the adacent section 11 by means of suitable clamps 20, and this construction is duplicated between the adjacent sections of each side as clearly illustrated. It is of course to be understood that the sections can be thus spaced apart any desired distance, and there being preferably two of such clamps 20 used between the. respective sections as shown. The ladder thus constructed possesses the desired flexibility to permit it to be rolled or folded compactly when not in use, but at the same time affords the ladder a maximum strength and'durability which such ladders require for safety when they are called into use. It will be further noted that the ladder is very simple in construction, and that the rungs 10 are so associated with the corresponding sections of the respective side members, that-all possibility of casual separation from said sections is reduced to a minimum.

While it is believed that from the foregoing description, the nature and advantages of the invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein shown and described and-that such changes may be resorted to when desired as fall within the scope of what is claimed.

Having thus described the invention, I claim:

1. A ladder of the character described comprising spaced side members, each side member including a plurality of sections and a single length of cable folded upon itself, and formed to provide a loop at one end of the latter, each section having a groove about the edge thereof and adapted to receive the adjacent portions of the cable, rungs "connecti'ng the corresponding sections of the reings and-opening into said groove, en'ddowel pins received by said bones for holding rungsflassociated with the sections, se-id -pi ns being held. in position by thecebley and means for holding the adjacent jp r ions -off the cable in contacting englagement betiveen' s aid 'section'sfor spacingt latter.

c mpris ng Sp ced js' embers; l ch id member including (a. plmfalit jo'f sectionsj ofelliptic'elformetion, 'end'a ca {le folded upon itself, and. formed; Withia-n" eye at one end the eye to "afford the latter rigidity, each section having a groove about the edge thereof-to receive the adjacent portions of theeeble, said portions of the cable being arranged in: parallelism and in contacting 'jengagenien-tfor e portion of their length,

between the respective sections for spacing seldsectionsg cleinps for holding said porand neceiye d shidopenings, each section v h vi' jber "e m f i-gh e to 2. ladder "of thefch'eracter' described said and; dowel pins received by sa1d bores for holding the; rungs associated with the seetions', seid pinsfb'eing po- I

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