US510108A - Step ladder - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1 A. BARR. STEP LADDER.

No.510,1 08. PatentedDe0.5,1893..

(No Model. 2 Sheets-Sheet 2.

A; BARR.

STEP L- ADDBR.

No. 510,108. Patented D60. 5, 1893,

UNITED STATES PATENT OFFICE.

ANDREW BARR, OF BOTHWELL, ASSIGNOR TO GAVIN STRUTIIERS, OF HAMILTON, SCOTLAND.

STEP-LADDER.

SPECIFICATION forming part of Letters Patent No. 510,108, dated December 5, 1893.

Application filed September 8, 1892. Serial No. 445,325. (No model.) Patented in England October 9, 1891, No. 17,180.

To all whom it may concern:

Be it known that I, ANDREW BARR, a subject of the Queen of Great Britain, and a resident of the town of Bothwell, Scotland, have invented a new and Improved Step-Ladder,

of which the following is a specification, and

for which I have received Letters Patent of Great Britain, No. 17,180, dated October 9, 1891.

This invention relates to a step ladder, which can, as desired, be used either as a pair of steps or as a ladder. And in order that my said invention may be properly understood I have hereunto appended an explanatory sheet of drawings, whereon Figure 1 is a side View of the step-ladder when used as a pair of steps. Figs. 2 and 3 are front and side views of the step-ladder, when used as a ladder. Figs. 4, 5 and 6 are enlarged detail views. Fig. 7 is an enlarged plan view of a rest or platform, which can be fitted on the steps.

Referring to the drawings, the same reference numerals, wherever repeated indicate similar or like parts.

The improved step ladder is made in two parts 1, 2, the upper part or extension 2, being hinged to the lower part 1, by means of the bolt or bar 3, which is passed through the upper end of the part 1.

5 and 6 are metal plates or bearings, for the ends of the bolts 3.

7 and 8 are pieces of metal, secured to the part 2, and having holesin them, through which the bolt3 is passed. These pieces serve as hinges for the part 2.

The upper end of the part 1 is provided with two recesses 9 and 10.

11 and 12 are metal plates, fitted at the lower ends of the recesses, for the purpose of preventing wear, and to strengthen the sides of said recesses.

The part 2 has a rung 13, which is formed, preferably, of a wooden cylinder through which is passed a metal bar or core 14.

15 are metal washers, placed between the ends of the wooden cylinder 13, and the sides of the step-ladder. The ends of the bar 14, project through slots 16, 16, made in each side of the part 2. The bar 14 can move up and down in the slots, 16, 16. The slots may be lined with metal, if so desired.

The upper ends of the part 1 are rounded off, as shown, while the lower ends of the part 2 are angled, so as to grip or catch against one of the steps 17, when the stepladder is extended.

A small platform 19 is hinged, at 22, to stays 20, secured to the part 1. When the step-ladder is used as a pair of steps, the recess 21, on its under side, is made to catch on the rung 13 so as to hold the parts, 1, 2, firmly together in an A shape. The platform can be used for supporting a paint pot, brushes, &c.

When it is desired to convert the step-ladder into a long ladder, as at Figs. 2 and 3, the part 2 is turned upward on the hinge 3, 7, 8, until the ends of the bar 14 override the top of the part 1, and fall into the recesses 9, 10. The slots 16 are for the purpose of al lowing sufficient movement or play to the bar 14, to enable it to override the top of the part 1. When it is desired to again convert the ladder into a pair of steps, the bar 14 is pushed upward in the slots, until it clears the recesses 9, 10, when the part 2 can be brought down to the position shown in Fig. 1.

Having now fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. A convertible step-ladder consisting of two parts 1, 2 which are hinged together at their upper ends, the part 1 having recesses 9, 10 atits upper end while the part 2 has a rung 13 capable of movement in slots therein the said rung being inserted in the recesses 9, 10 when the step ladder is extended, substantially as hereinbefore described with reference to the drawings annexed.

2. In combination, the parts 1 and 2 hinged to each other the said part 1 having the upper recesses 9, 10, the movable rung guided on the part 2 and having an iron core projecting laterally to engage the recesses and an inclosing cylinder 13, substantially as described.

In witness whereof I have hereunto set my hand, at Glasgow, Scotland, this 15th day of d June, 1892, in presence of two witnesses.

ANDREW BARR. Witnesses:

H. D. FITZPATRIOK, DUNCAN DEWAR.

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