US381510A

US381510A - Portable trestle

Info

Publication number: US381510A
Authority: US
Publication date: 1888-04-17
Anticipated expiration: 1905-04-17

Description

(No Model.)

J. G. RUSH.

PORTABLE TRESTLE.

PatentedApr. 17, 1888.

W/ T IVE SSE S ATTORNEY.

UNITED STATES PATENT Fries,

JOHN G. RUSH, OF \VESTWILLOW', PENNSYLVANIA.

PORTABLE TRESTLE.

SPECIFICATION forming part of Letters Patent No, 381,510, dated April 17, 1888.

Application filed January 24, 1887. Serial No. 225,413. (No model.)

To aZZ whom it may concern: 7

Be it known that I, JOHN G. RUSH, a citizen of the United States, residing at West Willow, in the county of Lancaster and State of Pennsylvania, have invented certain Iniprovemenls in Portable Trestles, of which the following is a specification.

My invention relates to that class of trcstles which can be moved from place to place and are made to be detachabl y connected with the members they are to support; and theobject of my improvement is to produce a light portable trestle fo r use by tobacco-growers for supporting the rails upon which tobacco-plants [5 are held while drying in the field, or by painters or plasterers for supporting the platforms upon which they stand while at work. This object I accomplish by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of a pair of my trestles, shown as they appear when in use;-

and Fig. 2, a perspective viewof a pair of tree tle-plates.

Similar letters indicate like parts through- 25 out the several views.

The trestle is composed of two upright plates, A, fuci ng and connected with each other. Each plate has an angle, (4, formed about and across the center, that part, B, below extending outward from the angle to the leg L, and that, G, above being approximately perpendicular. The lower end of the part B is provided with two arms, 2), one extending outward from each vertical edge of the trestle-plate and there bending inward, so as to form a channel for the reception of the legs L. These legs L simply pass through the channels, being prevented from extending too far upward by the angle a.

The trestleplates are connected by inwardlyprojecting arms 1), formed integral therewith and located just above the angle a. Each plate has two of these arms I), those of one plate lapping those of the other, all being sup plied with holes d, through which passes a rod, It, connecting the four arms. The holes in each plate areforined in a regular horizontal series, that the distance between the trestleplates may be varied to accommodate the beam E of different thicknesses, which rests upon the connecting'arms. The inner edge of each trestle-plate above the armsD is also provided with sharp inward projections or teeth T, which penetrate the beam E and prevent longitudinal motion of the same. The top of one of each pair of plates has a chain, F, fastened to it, which passes over the top of the beam to be supported and is caught in an angular notch in a log, Z, projecting outward and downward from the top of the other plate. By reason of .the shape of this notch the link of a chain can rest edgewise in it and the chain be prevented from drawing through by turning the next lower link sidewise.

As will be readily understood from the foregoing description of my trestle, the two plates are hinged together, as it were, by the connectingrod. The chain F draws the tops of the plates together to close upon the beam supported between them, while the downward pressure of the weight and the reaction of the legs L in the angles of the plates serve to keep the teeth 1' of the plates in engagement with the beam to prevent longitudinal movement of the same. The removal of the weight supported by the beam will at once permit the latter to be lifted from the trestle and the separation of the plates from each other and their supporting-legs.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, in a trestle, with the beam to be supported, of pairs of plates having upright portions which bear against said beam and lower portions spreading outward and having channels formed on their exterior faces to receive the legs, arms extending inward from said pprightportions and each provided with a series of perforations, and a rod for engaging the corresponding perforations-in each pair of arms, substantially as and for the purwith the lower part of the plates, for the purportions and pivoted together, and detachable pose specified. connections between the tops of said plates, 10

3. The combination, in a trestle, with the substantiallyas and for the purpose specified. beam, of pairs of plates composed of upright 5 portions bearing against said beam, lower por- JOHN RUSH tions spreading outward and having channels Witnesses: formed on their exterior faces to receive the J. K. BARR,

legs, arms extending inward from said upright WM. R. GERHART.