US 268616 A
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(ModeL) H. E. BROWN. ADJUSTABLE TABLE.
Patented Dec. 5, 1882..
INVENTOR WITNESSES W M M fi ATTORNEYS.
UNITED STATES PATENT OFFICE.
HENRY E. BROWN, OF LANSING, MICHIGAN.
' ADJUSTABLE TABLE.
SPECIFICATION forming part of Letters Patent No. 268,616, dated December 5, 1882.
Application filed December 15, 1880. (ModeL) To all whom it may concern:
Be it known that I, HENRY E. BROWN, of Lansing, Ingham county, State of Michigan, have invented a new and Improved Adjustable Book-Support; and I do hereby declare that thefollowing is a full, clear, and exact description of the same.
The object ofmyinvention is to provide anew and improved adjustable book-support which.
can be attached to a chair, table, or any projection'of a piece of furniture, can be adjusted higher and lower, and to have any desired inclination.
The invention consists in the peculiar construction and arrangement of parts, as hereinafter more fully set forth.
1n the accompanying drawings, Figure 1 is a side elevation of my improved book-support, showing the manner in which it is attached to a chair or other object. Fig. 2 is a longitudinal sectional elevation of the device for holdingthe table in the desired position. Fig. 3 is a plan view of the same. Fig. 4 is a [ongitudinal elevation of the pawl-arm and clamparm of the device.
An inwardly-flanged ring, H, is fastened to the under side of the table B, and an annular flange of the top plate, I, of the lugs J J fits into the space betwecnthe under side of the table B and the upper side of the flange of the ring H, as shown in Fig. 2, thus permitting the table to be turned on the top plate, I. A shaft, 0, passing transversely through a segmental rack, D, on a rod, E, is also pivoted in the lugs J J. A sliding latch,K, with a wedgeshaped tooth, L, on the under side and lugs a a at the ends, is mounted in the top plate, I, directly below its flange. Aspiral spring, M, acts upon this latch, drawing the tooth L into the teeth of the segmental rack D. A flanged bar, N, is provided with teeth I) I) on the inner sides of the flanges, as shown in Fig. 1. A pa wl-arm slides up and down on this bar N ,and can be held at any desired height. The rod E passes through two guide-rings, P, of the bar N, and its lower end rests upon the pawl-arm 0, as shown. The pawl-clamps Q and Q slide vertically on the bar N, and can be held at any desired height in the samemanner as the pawlarm 0, for they are also provided with the fulcrum-lugs c 0; but on the arm Q they are on the lower edge, as this arm receives an upward pressure but on the arm Q they are on the upper edge, as this edge is pressed downward. A screw, R, passes through the lower clamp-arm, Q and by means of these arms Q and Q and the screw R the double ratchet,
bar N is attached to tables, chairs, or projecting parts of any other piece of furniture.
The sliding latch K is drawn in the direction of its length in order to disengage the tooth L from the segmental rack D, upon which the board B is inclined, as may be required, and the latch K is then released and engages the tooth L with the segmental rack D, again thereby locking the table orhoard B in the inclined position. As the annular top plate, I, fits loosely in the flanged ring H, the board or table B-can be turned on this top plate, I. The pawl-arm 0 is raised more or less as the circumstance may require, and the pawl-clamps Q or Q are-also adjusted higher or lower on the bar N, as may be necessary, and then the same are fastened to a chair, table, or any other suitable projection by means of a screw, It. The board or table can thus be adjusted at any desired height or inclination with the greatest care and in a very short time, and
will always be held firmly.
I am aware thata desk has been provided with a springpawl on its under side to work in a rigid rack on the desk-standards; but
What I claim as new is-- 1. In an adjustable table, the combination,
firmly secured at any angle, substantially as described.
2. In a book-support, the combination, with the flanged bar N, provided with the guides P P, and with teeth on two opposite sides, of 5 the vertically-adjustable pawl-clamps Q and Q the screw R, the vertically-adjustable pawlarm 0, the rod -E, and the table B, pivoted to the top of the rod E, all substantially as herein shown and described, and for the purpose set forth.
HENRY EDWARDS BROWN.
GEO. W. PARKER, J AS. T. ZEALY.