US643969A - Scaffold or portable trestle. - Google Patents

Description

Patented Feb. 20, I900. T. MILNE. SCAFFQLD 0R PORTABLE TBESTLE.

2 Shoots-Sheet 2.

m 3 8 M U W UNITED STATES PATENT OFFICE.

THOMAS MILNE, OF SANDON, CANADA.

SCAFFOLD OR PORTABLE TRESTLE.

SPECIFICATION forming part of Letters Patent No. 643,969, dated February 20, 1900.

Application filed ctober 4, 1899.

To all whom it may concern.-

Be it known that I, THOMAS MILNE, a subj ect of the Queen of Great Britain, residing at Sandon, in the Province of British Columbia and Dominion of Canada, have made certain newand useful Improvements in Scaifolds or Portable Trestles, of which the following is a specification.

My invention is an improvement in that class of extension or adjustable scafiolds or portable trestles which are practically designed and adapted for the use of carpenters, plasterers, house painters, paper hangers, bricklayers, and other mechanics and workmen whose requirements of work are more or less similar.

My scafiold or trestle is adapted for adjustment, and hence for extension or contraction, vertically and horizontally, as conditions require.

A special feature of the invention is the adaptation of the parts of the trestle for detachment, and another is the provision and peculiar construction of metal castings for holding or supporting and connecting the different wooden portions or bars composing the frame proper of the scaffold or trestle.

Still other features are the arrangement of the bars relative to each other and the provision and application of special castings for holding planks or boards which may be laid on the scaffold or trestle.

The details of construction and arrangement of parts are as hereinafter described and claimed.

In the accompanying drawings, Figure 1 is an end view of my improved scaffold or trestle. Fig. 2 includes two perspective views of a metal casting which connects certain wooden parts of the trestle. Fig. 3 is a side view of the trestle. Fig. 4 is a plan view. Fig. 5 is a perspective View of a metal casting which connects upper wooden portions of the trestle. Fig. 6 is a perspective view of an attach ment consisting of aspecial casting for holding planks or boards on the trestle proper.

The scaffold or trestle is composed of two duplicate parts or structures A and A, which are in practice arranged parallel a suitable distance apart, as shown in Fig. 1. The base portion of each of the parts A and A consists (see Fig. 1) of two sets of pairs of legs 1, con- Serial No. 732,499. (No model.)

necting- bars 2 and 3, and a metal casting 4.

The legs are set at an acute angle to each The aforesaid castings 4chave transverse slots 8 to receive a wooden bar 9, that constitutes the top of each base section or half A or A of the trestle. These bars 9 are adapted to slide in said slots 8 and may hence be easily inserted or removed.

It is apparent that boards or planking may be laid and supported upon the bars 9 of two such trestle bases or sections when a low trestle is required.

The upper extensible portion of the trestle is formed of the aforesaid vertical rods 7, transverse bars 10, (see Fig. 3,) and castings 11, which are applied to and connect the ends of said rods 7 and bars 10--that is to say, the bars 10 are adapted to enter and slide in horizontal slots 12 (see Fig. 5) in said castings 11, while the rods 7 enter sockets 13 in the same and are held detachably therein by means of screws 14. The said rods may he slid up or down in the guides 6 of the lower castings 4, Fig. 2, and also through the guides or keepers 15, (see Figs. 1 and 3,) formed on the cross-bars 3, connecting the legs 1 of the trestle-bases. The rods 7 may be slid up or down in these guides 6 and 15, as required for adjusting the height of the trestle, and are secured and held in any adjustment by means of stout pins 16, which are inserted in transverse holes in the rods 7 and rest upon the castings 4-, as shown.

Planks or boards are laid upon the opposite top bars 10 of the trestle, as shown in Fig. 1,

-and they may also be laid upon the lower cross-bars 9 in the same manner.

For the purpose of preventing the planks slipping, especially when one is laid upon and parallel to a bar 10, as may be required to extend the width of the trestle, I propose to mit entrance of the complete structure.

The whole design is intended to admit of construction in wood ormetal, as may be considered most suitable.

What I claim is- 1. The improved trestle composed of two castings 4, having sockets in the under side, transverse slots and vertical slots, and the two sets of divergent legs fitted in said sockets, horizontal bars 9, which are adjustable in the transverse slots, and vertical bars which are adjustable in the vertical slots, castings 11 applied to such vertical rods, and having sockets and transverse slots, and the horizontal top connecting-bars 10, as shown and described;

2. The improved trestle composed of the castings l having leg-sockets,transverse slots, and vertical slots arranged exteriorly to said sockets, the divergent legs 1, horizontal bars 9, and vertical rods 7, passing through the vertical slots, and devices secured to the legs for holding and guiding the lower portions of said rods, as shown and described.

3. As an improved article of manufacture, the castings 4 having vertical slots 6, legsockets in the under side, and transverse slots 8 arranged between the said sockets and vertical slots, as shown and described.

THOMAS MILNE.

Witnesses:

JOHN W. BALMAIN, E. M. SANDILANDS.

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