US1710026A

US1710026A - Ladder attachment

Info

Publication number: US1710026A
Application number: US202710A
Authority: US
Inventors: Mccormick Patrick
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-09-03
Filing date: 1927-06-30
Publication date: 1929-04-23
Anticipated expiration: 1946-04-23

Description

April 23, 1929. P. MCCORMICK LADDER ATTACHMENT Filed June 30, 192'? 2 Sheets-Sheet April 23, 1929, P. MCCORMICK 1,710,026

LADDER ATTACHMENT Filed June 56, 192? 2 Shgets-Sheet 2 Invent r We Attorneys Patented Apr. 23, 1929.

UNITED STATES PATRICK MCCORMICK,

OF MONTREAL, QUEBEC, CANADA, ASSIGNOR OF ONEJTALT? TO DAVID ASGH, OF MONTREAL, CANADA. I

LADDER ATTACHMENT.

Application filed June 30, 1927, Serial No My invention has particular reference to the support of a ladder from the ground in-- justable device for serving the dual purpose of a brace for the ladder when the frame serves as a stand for the ladder and to act as a support for a scaffold when the frame is hung from one of the upper rungs of the ladder. I

More specifically stated the invention con sists of a rectangular frame having a pair of double hooks at one end and carried rigidly thereby. These hooks arepreferably formed in one piece with the sides of the frame. An adjustable rectangular frame is pivoted at one end of the side bars of the main frame and has a brace also in the form of a rectangular frame pivoted at one end near the outer end of the adjustable frame and having its op-' posite end bent to extend angularly and substantially parallel to the main frame. This bent and of the brace has ratchet teeth for engagement with rivets projecting inwardly through the sides of the main frame.

For full comprehension, however, of my invention reference must be had to the accompanying drawings in which similar ref erence characters indicatethe same parts and wherein c Figure 1 is a side elevation of my ladder attachment supporting a ladder from the Figure 5 is a side elevation of my improved attachn'ient removed; I

Figure 6 is a detail view of the ratchet toothed brace; and

Figure 7 is a detailhorizontal sectional view on line 7-7 Figure 6 of one of theside bars in engagement with one of the ratchet toothed angular ends of one of the braces.

. 202,710, and in Canada September 3, 1926.

My attachment as before mentionedmay be used as either a support for a ladder from the ground or as a support for a scaffold from one of the upper rungs of the ladder. To Whichever use it may be put its construction remains the same. The main frame of the attachment consists of a pair of side bars Zr having one end turned atan angle and pointed as at b and braced together by a pair of rods 0 protruding through holes in the side bars and having

nuts

0 and 0 securing the ends of the rods to the side bars. Lock washers c preventing the displacement of the nuts. One end of eachof these side bars is bent to the form of an elongated transverse hook, one end 6 of which serves to attach the frame to'one of the upper rungs of a ladder when a scaffold is to be supported, and the other end '7" of the book serves to connect the frame to the bottom rung of a ladder when the attach ment is to support the ladder from the ground as shown in Figure 1. Near the hooked ends of these side bars are pivoted a pair of side bars 3 of an adjustable frame and bracing rods secure the sides of the auxiliary frame in proper relative positions, the free ends of the side bars of such auxiliary frame being being bent at an angleas at j to serve as retaining means for scaffold planks. The aux iliary frame is adjusted to different angular positions by a pair of braces is rigidly secured in spaced relation by bracing rods cosimilar to rod coabove mentioned and connected to the side bar by nuts 0 and lock washers 0 also as above described. The braces are pivoted at their upper ends to the side bars near thefree ends of the latter, the opposite ends of the braces 70 being of angular form as at m to extend substantially parallel to the side bars Z) of the main frame, the lower side of the angular part m of thebrace is formed with ratchet teeth a. The bars Z) having a series of preferably five rivets 0 carried thereby and extending a short distance therethrough for engagement by the ratchet teeth a of the braces. These rivets are preferably of slightly greater length'than the thickness of the ratchet toothed portion m of the brace and theside bar 1) against which it lies, the portion 79 of the rivet extending through the side bar 5 being of slightly less diameter than the portions extending latterly from the side barisuch portion shaving a fixed head thereon while the reduced portion is rivetted for the purpose of fastening the rivets rigidly to the side bars and thereby provide a rigid hold for the connection of the brace to the side bar of the main frame. The frame may be folded to liesubstantially flat andimay be detachably connected to va'ladder by a' chain t attached to the end bracing rod 0. By this means the hooks e, fmay be engaged with one of the rungs of the ladder and the chain used as a ladder, base or foot or as a support for' ajscafl'old from one of the upper rungs of the ladder or from a' pair of ladders.

My improved attachment 1s manipulated as follows For use as'a support for the ladder the eye: of the hook e, is engaged with the bottom rung of the ladder as shown in Figure 1 andthe frame rests with the points of its side bar-s engaging the ground or the floor of a building asthe case may be. The braces l': are then disconnected from the studs formed by the rivets andthe adjustable frame is shifted into contact Wit-lithe ladder When in the position in which it is required for use,

the brace k is then pressed downintoengagement with'th'e studs, the ladder Will then be supported independently-of any Wall and in an upright position, and the frame presents a base or'foot sufiicient for the center of gravity to be Within the base atwhateverposition on the ladder a workman may be. To use the attachment as a scaffold support the eyes of the hooks, e, 'f, of reach of two frames is engaged with rungs of a pair of ladders A and B leaning up against the Wall to have a sign painted upon it for instance,

.the Wall C and the adjustable frame is adjusted by moving the braces 76 to bring the side bars j to a horizontal position. Planks D are laid on the frames j, thus affording a firm foot-hold for a Workman.

lVhat I claim is as follows 1. A ladder attachment comprising a frame composed of side bars united in spaced relation by rods rigidly secured at their opposite ends to the side bars, an auxiliary frame pi oted to the main frame near one end thereof and the protruding ends thus produced of the main frame having formed integrally therewith transverse elongated hooks, the auxiliary frame being composed of a pair of side bars, a pair of braces pivotally connected tothe side bars of the auxiliary frame near the free endsthereof and having their opposite ends bent at angle and having their edges towards the main frame formed with ratchet teeth, the side bars of the mainframe having studs for engagement by the ratchet teeth and the ends of the side bars of the main frame opposite to the auxiliary frame having angul'arly disposed points substantially as described. r

2 Aladder attachment of the character described coinprising a main frame, an auxiliary framehaving one end pivotally conneeted with the main frame, mechanism pivotaily connected with the auxiliary frame and engageable with the main frame for adjusting the auxiliary frame at various angularpositions with respect to the main frame, and a pairof opposed transversely elongated hooks formed at one end of the main frame, said hooks being bent'to form semi-circular rung engaging projections at each end thereof.

I Inivitness whereof I have hereunto set my hand.

PATRICK MCCORMICK.