US177993A

US177993A - Improvement in revolving book-cases

Info

Publication number: US177993A
Authority: US
Publication date: 1876-05-30
Anticipated expiration: 1893-05-30

Description

J. J. CRANDALL.

REVOLVING `13cm: CASES.

Patented May\30,1876.

WITNESSES: l

ATTommY. y

NPEERS. PHOTO-LITHOGRAFHER, WASHINGTONAD. C.

IINITED 'STATES PATENT QEEICE.

JOHN J. CRANDALL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO JACOBS W. SCHUGKERS, OF NEW'YORK, N. Y.

IMPROVEMENT IN REVOLVING BOOK-CASES.

Specification forming part of Letters Patent No. 177,993, dated May 30, 1876; application filed 4 January 11, 1876.

To all whom it may concern Be it known that I, JOHN J. CRANDALL, of the city and county of Philadelphia, in the State ot' Pennsylvania, have invented certain new and useful Improvements in Revolving Book-Cases,iof which the following is a speciication:

The object of my invention is to provide a revolving book-case which shall be light, simple, and inexpensive in its construction, and capable of easy rotation Without liability to derangement ot' its parts; to which ends my improvements consist in the combina-tion of a vertical central standard, having a step or center at its top, a metallic frame or spider secured to the top of the case, and resting upon the bearing ot' the central standard, and a .bottom )late (in one or more sections) connected with the upper spider by bolts passing -cal central section ot the same; Fig. 3, a horizontal section, showing the bottom plate in view; and Fig. 4, a top view with the` cover removed.

To carry out the object ot' my invention I provide a vertical standard. or column,-A1, mounted in the center of a metallic frame or disk, A, supported on suitable feet a. The

lower end of the standard is slightly conical, and is fitted in a corresponding 4socket in the frame A. A metallic step or center'bearing, A2, is secured upon the top ofthe standard A1. The case is composed of a top plate, B, bottom plate B', (each in one or more pieces,) inner casing E, sides D, and shelves G, the

Whole united by vertical bolts F. The ,sides may be three or more in number, six being shown in this instance; and in order to make `the spacesfor the reception ofthe books as nearly parallel upon their sides as practicable, the sides D are made in the form of hollow posts or casings, preferably triangular in section. The bolts F pass through the hollow posts, and are secured to the bottom plate B by nuts and Washers. The upper ends ot' the bolts pass through a corresponding number of arms, c, on a metallic plate -01 spider C, which rests on the top plateB, and is provided at its center with a projection, which ts into a central opening ot the top plate B, and has a bearing, c1, for the step or center A2. Additional clamps c2 secure the arms of the spider C to the top plate. B ot' the case, and to the top plate of the inner casing E. rIhe bottom plate B is provided with a central opening, b,-Wl1,ich eucircles the standard A1,for the purpose of guiding the case in its rotation about the standard, andof preventing vibration of the case when rotated. The vertical spaces or divisions formed between the hollow'posts D may be divided horiy .JOHN J. CRANDALL.

Witnesses:

J. SNOWDEN BELL, F. E. HARnrNer.`