USRE2066E - Improvement in hoisting-machines - Google Patents

Description

NJETERS, PHOTO-LITHDGRAPNE R. WASHINGTON. D Q2.

UNITED STATES PATENT OFFICE.

VILLIAM MILLER, OF CINCINNATI, OHIO.

IMPROVEMENT IN HOISTING-MACHINES.

Specification forming part of Letters Patent No. 48,579, dated July 4, 1865; Reissue No. 2,066, dated September 5, 1865.

.To all whom, it may concern,.-

Beit known that I, WILLIAM MILLER, of Cincinnati, Hamilton county, Ohio, have invented a new and useful Improvement in Hoisting-Machines or Elevators; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification.

rlhe present invention relates to an Improvement on the device patented to me on the 12th lday of May, 1863; and it Vconsists in a more simple, secure, and efficient adaptation of the worm principle to an elevator or hoisting platform.

Figure 1 is a perspective view of a portion of a hoisting-machine included between two consecutive floors. Fig. 2 is atransverse section below the platform, and looking upward. A and A represent customary hatchways flanked by Worm-racks or segmental nuts B B', which extend vertically from the lowest to the highest door, and which are firmly secured to and supported by suitable stanchiolls, C C.

I) is a platform, to which is attached a suitable frame or housing, E, containing a large Worm-wheel, F, which meshes equally in both racls B Bf The weight of the platform is received directly by the Worm-wheel, near the margin of the latter, through the medium of rollers G, Whose bearings depend either from the platform or from the upper part of the housing E. The Worm-Wheel F has a hub, I, which is connected to the outer ring or margin of the wheel by a light plate, J, or by spokes. 'Ihe hub I is secured to a shaft or axis, H, journaled vertically in the frame E. The duty of the shaft H is merely to hold the Worm to its proper central position between the racks, the worm itself being supported Wholly by the racks. The worm F has on its liable.

worm to the racks, and also in freedom from the strain and displacement to which the journals of small and separate worm-wheels are Another obvious advantage is that each revolution of the worm may be made to produce a more rapid ascent or descentof the y platform, with a less abrupt pitch or declivity of the thread. Y

An inferior modification of my device may have the platform D supported upon the yvorm F through the medium of a rim or circular flange, in place of the rollers G. Still another modification may consist in substituting wormgearing for the bevel-wheel K and pinion L.

I claim herein as new and of my invention- 1. Elevating or depressing the platform of 'an elevator or hoisting-machine by means of a single traveling worm-wheel which meshes within two or more corresponding screw-racks or segmental nuts.

2. An elevator-platform supported by rollers G or their equivalents on a single Worm- Wheel resting in worm-racks or segmental nuts, substantially as set forth.

In testimony of which invention I hereunto set my hand.

WILLIAM MILLER.

Vitnesses GEO. H. KNIGHT, J AMES H. LAYMAN.

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