US46812A - Improved extension-ladder - Google Patents

Description

UNITED STATES PATENT GEEIcE.

WARREN MOREHEAD, OF PARKERSBURG, WEST VIRGINIA.

IMPROVED EXTENSION-LADDER.

Specification forming part of Letters Patent No. 46,8 l2, dated March 14, 1865.

To all whom t may concern.-

Be it known that I, WARREN MoEEHEAD, of Parkersburg, in the county ot' Wood and State of West Virginia, have invented a new and useful Extension-Ladder and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the saine, reference being had to the annexed drawings, making a part of this specication, in which- Figure 1 is a vertical view showing the triangular ladder A, sliding ladder B, pulley c, rope d, groove e for receiving the rope d, the point f of attachment of the rope d to the sliding ladder B, and the latch E, for holding the sliding ladder B in its position.

F ig. 2 is a side view, partly sectioned, showing the groove g for receiving the guides, which prevent back and lateral motion, pulley c, and the latch E.

Fig. 3 is a transverse section showing the rounds h, the standard C of the triangular ladder A, the sliding ladder B, the guides k k, for preventing back and lateral motion, and the groove g in the sliding ladder B, for receiving the guides k k.

Fig. 4 is an enlarged section showing the construction and operation of the latch E, to operate which the sliding ladder B must be drawn up by the rope il acting over the pulley c and attached to the sliding ladder B at f until the tongue m of the latch presses underthe round 7L', Fig. 4next above the oneupon which the catch c of the latch is expected to fasten. This pressure of the tongue m throws forward the rod u, (of which the catch 'v is a prolongation,) while the vibrating arm w forces the catch 'v above the round y. In raising the sliding ladder B the catch c must pass under the rounds hot' the triangular ladder A. This brings it level with the face of the sliding ladder B. To force it out again, the spring x is placed at the back of the sliding ladder, acting on the catch n through the medium of the vibrating arm w. To lower the sliding ladder B, it must be raised until the tongue m is above the round h', Fig. 4, which brings the catch .o on a level with the face of the sliding ladder, thus offering no resistance to its descent. a

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination of the triangular ladder A, the slidingl ladder B, the guides lc 7c, and the latch E, constructed, arranged, and operting in the manner specified.

VARREN MOREHEAD.

Witnesses:

JOHN WHITE, F. L. KIRKPMRICK.

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