US669004A - Combined trestle and extension-ladder. - Google Patents

Description

No. 669,004. Patented Feb. 26, I90l.

J. 3. TILLEY. I COMBINED TRESTLE AND EXTENSION LADDER.

(Application filed Oct. 23, 1900.)

(No Model.)

TTn STATES PATENT OFFICE.

JOHN S. TILLEY, OF WATERVLIET, NEW YORK.

COBIINED TRESTLE AND EXTENSION-LADDER.

SPECIFICATION forming part of Letters Patent No. 669,004, dated February 26, 1901.

Application filed October 23, 1900. Serial No. 34,075. (No model.)

To all whom it vac/y concern.-

Be it known that I, JOHN S. TILLEY, of the city of lVatervliet, county of Albany, and State of New York, have invented a new and useful Combined Trestle and Extension-Ladder, of which the following is a specification.

My invention relates to an improved construction for combining a ladder-trestle and an extension-ladder, whereby the parts are firmly secured when connected for use and whereby the trestle can be used without the ladder extension when desired.

Accompanying this specification to form a part of it there is a plate of drawings containing seven figures illustrating the application of my invention, with the same designation of parts by letter reference used in all of them.

Of the illustrations, Figure 1 is a side elevation of my combined trestle and extensionladder. Fig. 2 is a front View of the same. Fig. 3is a perspective of one of two plates, to the'outer face of one of which plates each of the rails of the trestle sides is hinged and on the inner side of each of which plates a slide is formed for one of the side rails of the extension-ladder. Fig. 4 is a section taken on the line 00 00 of 1. Fig. 5 is a side elevation of a modification, with the lower ends of the trestle sides shown as broken off. Fig. 6 is a section taken on the line 00 00 of Fig. 5. 7 is a perspective of one of the plates to which the trestle is hinged in the modification shown at Figs. 5 and 6, parts shown at Figs. 3, 4., 6, and 7 being illustrated upon a larger scale than in the other figures.

The several parts of the apparatus thus illustrated are designated by letter reference, and the function of the parts is described as follows:

The letter T designates the trestle formed by the ladder sides S, each having upon its inner face at its upper end the plate P, with the ladder sides at each side of the trestle having their rails R hinged to one of the plates P atthe upper ends of the rails, and above where thus hinged the rails of the trestle sides are each angularly cut away at O, and where thus angularly cut away they have formed oppositely on their inner sides the horizontally-arranged semicircular groove M. Each of the plates P has upon its inner face the slide D, formed by the inwardly-extended slide sides d projected from the plates P, and the letters I designate a tube-form projection that is outwardly projected from each of the plates P, said tube-form projection of each of the plates P interiorly connecting with a passage through the latter, as indicated atp and as thus formed upon the outer face of each of the plates P these tube-form projections I will each be inclosed by the grooved recess M when the trestle sides at the bottom are spread apart for use, with the angularly-cut-away faces 0 in contact at their upper ends, and being so inclosed the rails of the trestle sides are firmly held in posit-ion and any tendency to vibrate when under strain is prevented.

The letters A A designate the usual trestlelatches, of which there is a pair for each side of the trestle, each one of each pair of which at their outer ends is pivoted to the rail thereat, with the innerends arranged to connect by means of a pin upon the inner end of one of them and a latch upon the other.

The letters E designate the extension-ladder, L L the side rails, and R the rungs or rounds. Each of these side rails L is provided with holes or bolt-passages 0, arranged to be oppositely and horizontally in line with each other. This extension-ladder E is connected to the trestle T by having each of the rails thereof entered within one of the slides D of each of the plates P.

The letter J designates a bolt or securingrod, having at one of its ends the operatinghandle 71 and at its other end provided with a thumb-screw nut N. This rod or bolt is entered so as to pass into and through the oppositely-arranged tube-form projections I of each of the plates P, and the latter, as well as the intermediately-placed ladder-extension side rails L, through such of the oppositelyplaced passages O as will give to the entered ladder extension the desired vertical elevation, with the parts thus placed secured in position by means of the nut N.

In the modification shown at Figs. 5, 6, and 7 the plates P are each provided with a wedge-shaped rib 13, arranged lengthwise in a groove V, havinga V form in cross-section and formed for a slide in the outer face of the ladder-extension side rails L L in longitudinal position with ladder extension E of the modification,arranged to be secured therein by means of a bolt or rod J arranged to pass through a tube-form projection I on the outer face of each of the plates P also through the latter and two of the holes 0 where oppositely formed in the ladder-extension side rails L L to be as thus placed secured by the nut N By thus arranging the plates in which the extension-ladder is mounted (and upon which the inner side and upper end of the trestle-rails are hinged) the ladder extension can be detached and the trestle used without it, and another great ad- Vantage occurs from this construction in the fact that the ladder extension can be vertically raised or lowered without changing the position of the trestle-base.

By forming upon the plates (to which the upperends of the trestle side rails are hinged) outwardly extended tube form projections through which the securing-rod passes to connect the trestle and extension-ladder this securing-rod is firmly held at its ends within the tube-forin projections and as so held firmly retains the extension-ladder in position. By grooving out the angularly-cutaway meeting ends of the trestle side rails so that they will each grasp one of the tubeform projections the trestle when in use is rigidly held by this connection, and any tendency to vibrate under strain is avoided.

Having thus described myinvention, what 'I claim, and desire to secure by Letters Patent, is

l. The combination with the opposite sections of a ladder-form trestle having the upper ends of each of the trestle side rails cut away angularly on its inner face and where cut away angularly oppositely and horizontally grooved; of a plate arranged upon the inner face of each of the trestle sides and to which the rails of the latter are hinged, be-

low where angularly cut away; a tube-form projection on the outer face of each of said plates, having a continuous passage through the latter; an extensioitladder adapted to have its side rails make a sliding engagement with said plates and provided with oppositelyarranged bolt-passages; and a securing-rod adapted to be passed through said tube-form passages, plates, and two ofthe intermediately and oppositely placed bolt-passages of the ladder-extension rails, and be secured therein substantially as shown and described.

2. The combination with a trestle comprising two ladder-form sections; of a plate to which the side rails of-each of the trestle-sections are hinged at their upper ends, and below which point they are angularly cut away to meet, when the lower ends of the trestlesections are spread apart for base-support; a tube form projection outwardly extended from each of said plates, and having a connected passage-way through the latter; a groove formed in the angularly-cut-away rail ends of each of the trestle-sections, whereby the latter are adapted to grasp the tube-form projection at each side of the trestle; an extension-ladder adapted to have its side rails make a sliding engagement with the inner face of the plates, and provided with oppositely-arranged bolt-passages; and a securingrod adapted to be passed through said tubeforn projections, the plates, and the opposite-ly-formed bolt-passages of the side rails of the ladder extension, and be thereto secured, substantially as, and for the purposes set forth.

Signed at the city of Troy, New York, this 18th day of October, 1900,in the presence of the two witnesses whose names are hereto Written.

JNO. S. TILLEY.

Witnesses:

W. E. HOGAN, CHARLES S. BRINTNALL.

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