US1439068A - Scaffold trestle - Google Patents

Description

Dec. 19, 1922., P. comm.

SCAFFOLD TRESTLE.

FILED MAR. I6, 1922.

Patented ec. I9, 1922.

T 'I E.

PERRY COLLIER, OF CONNEAUT, OHIO.

SCAFFOLD TRESTLE.

Application lled March 16, 1922.

To all whom it may concern i Be it known that I, PERRY COLLIER, a citizen of the United States, residing at Con neaut, in the county of Ashtabula and State oit Ohio, have invented certain new and usei'ul Improvements in Scatfold Trestles; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part oi? this specification.

This invention relates to scaffolding, and the object thereof' is to provide trestle mech anism therefor, which has adjustability, whereby the vertical elevation ot the scaffold horses can be raised or lowered as may be desired.

Figure l, is a side elevation of my improved trestle mechanism showing a portion of the scaffold .et-ringer secured therein.

Figure 2, is an end elevation ot the saine.

Figure 3. is a vertical central section thereof, with portions ot the mechanism broken away.

ligure il, is a top or plan View of a por-4 tion thereof.

In these drawings A indicates a trestle traine preterably made ot metal; said frame heilig preferably triangular in form as shown in Figure 2. This trame is provided with a cross bar B having holes b therethrough. Between the bar B and the apex a otl the frame A I secure a tube C. In the tube C I place a rod D having a Series of transverse holes a7, therethrough, adapted to receive a pin d by means of which the post or rod D is fixed at the desired elevation in the 'frame A.

@n the upper end of the post or rod D I place a U-shaped clamp E which is provided with a hand screw c. Within the clamp E is placed a transverse stringer F upon which the scaffold boards are laid; the opposite end of the Stringer F being preferably7 pro vided with a duplicate oi' the trestle herein shown and described. G indicates a brace mechanism which is preferably provided Serial No. 544,199.

with a forked end G, the prongs g of which are adapted to enter the holes in the bar B of the frame A.

These prongs g are so designed that by raising the brace Gr to a substantially vertical position they can be inserted into the holes Z in the bar B oi the iframe l, and when the brace G is swung downwardly to the position thereof shown in Figure l, said prongs are firmly locked in said holes. The bod y of thebrace G is tubular and lirinlysecured on the forked end G thereof, and is provided with a transverse hole g therethrough, adjacent to the upper end thereo'lI (see Fig. i) and slidably mounted in the body Gr is a telescopic extension II which is provided with a series of transverse holes z. therethrough adapted to coincide with the hole g and to receive the pin I-I there through, by means of which the extension II may be placed in adjusted position in the body G.

lUpon the outer end of the extension II I place a U-shaped clamp J which is provided with a screw j by means ot which said clamp is firmly secured in place upon the Stringer F so that the trestle structure will thereby be maintained in a vertical position.

In operation the prongs g of the brace G are inserted into the holes in the bar B oi the trestle frame fr; then the clamp E is secured upon the stringer- F and the post D is raised to the desired elevation and the pin d inserted into one or' the holes (Z in the post D to prevent said post from sliding downward in the frame A.

The extension I-I of the brace G is then adjusted to the desired length. and the clamp J is secured on the stringer F insuch posi* tion as to maintain the trestle` 'frame A at suliistantially right angles to the stringer F.

Having thus shown and described my in` vention so as to enable others to construct and utilize the same. what I claim as new and desire to secure by Letters Patent is In a device of the class described, a substantially triangular frame having a ilattened top. a cross-bar to space the feet thereof apart. said cross-bar being provided with spacedapart holes in the intermediate adapted to he inserted into the spaced-apart holes n said crosshar7 and clamps on the upper ends of sad'vertcal rod and said 10 brace-barn testimony whereof aX my signature.

PERRY COLLIER.

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