US175467A - Improvement in step-ladders - Google Patents

Description

G. KING.

STEP-LADDER, No.175,467. Patnted March28, 1876.

1\TITED STATES PATENT OFFrE GEORGE KING, OF FREDERIK, MARYLAND, ASSIGNOR TO HIMSELF, JOHN H. KELLER, AND DAVID W. BROOKS, OF SAME PLAGE.

IMPROVEMENT IN STE'P-LADDERS.

Specification forming part of Lette1s Patent No. 175,467, dated March 28, 1876; application filed August 24, 1874.

T0 all whom z't may concern Beit known that I, GEORGE KING, of Fred eriek, eounty of Frederiek and State oiMaryland, have invented a new and useful Improvement in Step-Ladders; and 1 do hereby deelare that the following is afull, clear, and exact description thereof, referenee being had to the accompanying drawings, making part of this specication. in whieh Figure 1 is a perspective view of my improved ladder. Fig. 2 is a side elevation of the upper portion of the same. Fig. 3 is a detailed horizontal section of the earriage in the line ac 90 of Fig. 1. Fig. 4 is an inverted seetional view taken in the line :1 3 Fig. 2.

The object of this invention is to strengthen and support the carriage of a step-ladder in sueh a manner as to prevent lateral or vertical displaeement of its parts without adding I0 the weight of the ladder.

My improvement consiscs in arehed braces in combination with the side or carriage pieces ot the ladder proper, and With the hingingblooks at the upper end of said side pieees, said arehed braees being tongued into the grooved carriage-pieees and abutting against the hinging-bloeks, as will be presently deseribed.

To enable others skilled in the art; 130 understand my invention, I will proceed t0 describe it.

In the aceompany drawiugs, A represents a step-Iadder ot usual form; B B, theearriagepieees, eonstrueted With steps in the ordinary manner, but supported on their outer sides with braces C 0. These braces are of arohed form, tongued into the sides of grooved carriage-pieces, as shown at c, and abutting at their upper ends against the hinging-bloeks D. E E are rear arehed braces, bearing laterally inward against shoulders d formed on the steps, and fastened at their opposite ends to the rear side of the carriage-pieees, as shown. The hinging-bl0cks D D are. construeted With flaring knuekle-soekets I) I) on their outer sides, as shown in Fig. 2 of the drawings, and into these soekets the upper ends of the supporting-legs F F are fitted, and connected to the carriage-pieees by pivotscrews g 9. The hinging-blocks are rigidly seeured to the sides of the earriage-pieees, and upon the tops of these blocks a stand board, a, is firmly attaehed. The supportinglegs are eonstructed in the usual manner, and their swinging distance may be regulated by the means shown.

It will be seen that the hingng-bloeks of the earriage-pieees are strengthened and supported against vertical pressure by the arehed braces tongued into the sides of the carriage, said braees abutting at their upper ends upon the under side of the ln'ngin g-bloeks, and beuring laterally against the sides of the grooves in the earriage-pieees, whereby the hingingblocks and carriage-pieces are sustained in p0- sition.

It will also be seen that the carriage is susbraees O O, side-grooved earriage-pieees B B,

and hinging-bloeks D D, in a step-ladder, substantially as deseril )ed.

GEORGE KING. Witnessesz E; SHRIVER, W. MAHONY.

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