US295578A

US295578A - Attachment for scaffolding

Info

Publication number: US295578A
Authority: US
Publication date: 1884-03-25
Anticipated expiration: 1901-03-25

Description

UNITED STATES PATENT OFFICE.

JOHN T.'OBRIEN, OF PHILADELPHIA, PENNSYLVANIA.

ATTACHMENT FOR SCAFFOLDING.

SPECIFICATION forming part of Letters Patent No. 295,578, dated March 25, 1884. Application filed October 25, 1883. (No model.)

To wZZ whom it may concern Be it known that I, JOHN T. OBRIEN, of

State of Pennsylvania, have invented a ogrtain new and useful Improvement in Attachments for Scaffolding, whereof the following is a specification, reference being had to the accompanying drawings.

Figure lis a view in perspective of my improvement as applied-to a window; and Fig. 2 is a plan view of the same, showing also horizontal sections through the scaffold-upright and the window-frame.

In erecting exterior scaffolding it is necessary, of course, to provide lateral supports or braces for thescaffold-upright, and as they must be firmly secured to the building, they are usually nailed to the window sills or frames-,a method which frequently results in the defacement, of the latter.

The object of my invention is to so construct these braces as that they can be readily secured to and removed from the windowsill without disfiguring the sill. As windowframes are at present constructed it is an almost universal practice to extend the molding which forms the outside guide for the upper sash, and sometimes known as the outer sash-bead, all the way down to the sill, and it is this feature of construction of which I avail myself to obtain the necessary lateral hold for the brace, the vertical rest being upon the sill itself.

In the accompanying drawings, A represents the window'sill, and B the outer sashbead, extending down to thesame. G is the scaffold-upright, which is shown as constructed in accordance with the method specified in another application (Serial No. 109,978) filed by me contemporaneously herewith. The up right is provided with horizontal holes a, to receive the bolts b, by means of which the brace is secured thereto. This brace consists of a stout iron bar, D, preferably constructed of the form shown, and provided with a series of horizontal holes, 0, near one end, to adapt it to uprights at different distances from the window. The other end rests upon the telescopic locking-piece'E. to which it is attached by means of a thumb-screw, d, or in any convenient manner. A diagonal stay,

13, secured to the center of the bar D and to the locking-piece E by thumb-screws g h, is

also provided to insure steadiness.

The locking-piece consists of two bars, e f, one of which is preferably formed with a groove, in'which the other slides longitudinally, and each having a series of screw-holes to permit the bars to be secured together at any desired length. The outer ends of the bars 6 f are bifurcated, forming an opening or recess, m, between the forks of a depth adapted to receive the outer sash-beads, B, which Vary but little in size in different houses.

WVhen it is desired to attach the bar to the window, the locking-piece E is placed upon the sill, and the bars 6 f are extended longitudinally until the ends embrace the outer sash beads, B, as shown in the drawings. The bars are then locked together, prefer ably by means of the same thumb-screw, d, which secures the bar D to the locking-piece, or in any convenient manner, and the outer end of the bar D is attached to the upright O by means of a bolt and nut, b. The stay F is then secured to the bar D and the lockingpiece by the thumb-screw g h, the latter, if desired, also serving as an additional fastening for the bars e f themselves. The uprights 0 being thus firmly braced and secured to the building, the stagings or planks can be mounted thereon either by resting them directly upon the braces D or in any convenient manner, and, when desired, the braces D can be detached without loss of time or injury to the building.

I am aware thatthe use of an adjustable piece adapted to fit between the partingbeads of windows is not, broadly speaking, new, and I do not desire to claim such device, except in combination with the other elements hereinafter particularly mentioned.

My invention consists in and I claim- The combination,with the scaffold-upright, of the horizontal brace D,-attached thereto, the telescopic locking-piece E, having end recesses substantially of the form and for the purposes specified, the diagonal stay F, and suitable means for securing said parts together, substantially in the manner setforth.

JOHN T. OBRIEN.

Witnesses: I WM. .11. MYERS, J WALTER DOUGLASS.