US555269A - Trestle for plasterers - Google Patents

Description

l(No Model.)

Patented Peb. 25, 1896.

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f a m noch/@M9770 3202i SMO/M ANUREW ELGHAHAM PHGTCI-Lm-lu wAsHmGrDrLDU UNITED STATES PATENT OFFICE.

ENocII SPEAGUE, or sr. LOUIS, MISSOURI.

TRESTLE FOR PLASTERERS, 86C.

SPECIFICATION forming part of Letters Patent No. 555,269, dated February 25, 1896.

Application led March 2 6, l 8 9 5.

T0 all whom it may concern.'

Be it known that I, ENocII SPRAGUE, of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in Trestles, of which the following is a speci- Iication, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in linockdown trestles; and it consists in the novel arrangement and combination of parts more fully set forth in the specification and pointed out in the claim.

In the drawings, Figure lis an end view of my complete invention. 2 is a front view with parts broken away. Fig. 3 is a bottom plan view of the terminal casting carrying the main beam and legs. Fig. @L is a top plan view thereof. Fig. is a section on line a: of Fig. 4. Fig. 6 is a top plan view of the adjustable shoe securing the extension -legs. Fig. 7 is a top plan view of the fixed guideboX for the extension-legs, and Fig. S is an enlarged view taken on the section-line y y of Fig.

The object of my invention is to construct a knockdown trestle whose parts can be readily assembled or taken apart, one which can be readily adjusted for various heights depending on the purposes to which it is to be put, and one which shall present the advantages of simplicity, durability, and lightness. In detail it may be described as follows:

Referring to the drawings, l represents the longitudinal top beam or member of the trestle, the opposite ends of the same being supported within and passed through the central cavity 2 of the terminal casting 5, the cavity 2 having disposed on either side thereof the triangular prismatic sockets a for the reception of the bevel ends of the main supporting-legs 5. The parts are secured temporarily by a pin 6 passing through aligning openings formed in the several parts. The bottoms of the main legs carry or have se-` cured thereto by means of a suitable pin 7 a stationary guide-box 8 having parallel lateral and terminal walls.

To prevent spreading of the parts, a transversebasal tie beam 9, having terminal spring-lingers l0, connects the bases of the legs 5, the fingers l0 being passed over the up- Serial No. 543,299. (No model.)

per edges of the inner walls of the said boxes. To further strengthen and brace the parts, a brace-bar ll is pivoted at a suitable point on the under surface of the main member l, the free end of the said bar being allowed to engage frictionally against the sides of thetiebeam 9, as best seen in Figs. l and 2.

\Vithin theboxing 8 and along the outside of the legs 5 are passed the extension-legs 12, the upper ends of the same being held in close contact with the main legs 5 by theinclined walls 13 of the adjustable or movable shoes la carried by the upper ends of the extensionlegs, the said upper ends of the extension-legs being beveled or wedge-shaped, the inclined wall of said bevel co-operating with theinclined wall 13 of the shoe, so that the greater the weight brought upon the trestle the closer will be the contact between these parts and the stier the connections between them.

The main supporting-legs 5 are provided with a series of openings l5 to receive apin 16 by which the position of the extension-legs can be varied at pleasure and the legs secured at the various points according to requirement.

Having described my invention, what I claim is- In a trestle, suitable main supporting-legs, a stationary guide-box carried at the lower end of each leg and embracing the same, a movable shoe passed over each leg above the stationary guide-box, an extension-leg passed through the guide-box on the outside of the main supportingdeg, an inclined or bevel upper end for each extension-leg, an inclined upper supporting-wall forming a part of the movable shoe located adjacent to the outer face of the leg and adapted to come in engagement with the bevel end of the extension-leg and force the same in close contact with the supporting-leg, a series of openings formed in the main supporting-legs, and a pin passed through the several parts to secure the eXtension-legs at any convenient point along the length of the main supporting-legs, substantially as set forth.

ENOCII SPRAGUE. IVitnesSes:

HY. NAACK, E. G. BRUNNER.

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