US137866A - Improvement in school desks and seats - Google Patents

Description

.l. B. SHERWOOD.

School-Desks and Seat s.

' Patented April 15, 1873.

AM PHGTU-LITHOGHAFHIO ca NX (USED/#15:? P600555.)

UNITED STATES PATENT OFFICE.

JOHN B. SHERWOOD, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN SCHOOL DESKS AND SEATS.

Specification forming part of Letters Patent No. 137,866, dated April 15, 1873; application filed March 19, 1873.

To all whom it may concern:

Be it known that I, JOHN B. SHERWOOD, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Hinges for School-Desk Seats, of which the following is a specification:

The nature of the present invention consists in a three-plate hinge for supporting the foldin g seat-arm. The plate attached to said arm rotates between the standard-plate and a capplate, and strikes against rubber buffers dovetailed into projecting lugs, and the cap-plate is screwed fast to the standard-plate, and kept from rotating by means of pins projecting out from said lugs, as the whole is hereinafter fully described and shown.

In the drawing, Figure 1 is an end elevation of a school-desk and seat provided with my improved hinge. Fig. 2 is an elevation of the standard-plate; Fig. 3, an elevation of the arm-plate; Fig. 4, a section of the hinge taken on line b b Fig. 2 Fig. 5, an elevation of the cap-plate.

J represents a face-plate attached to or cast solid to the standard B of the frame A D C, and provided with outwardly-projecting lugs S S and projecting pivot M. The lugs S have dovetailed into them rubber buffers L L for the internal projection G G on the central plate I to strike against when the seat-arm l, is raised or lowered, the projecting part G G being provided with an annular ring, H, which rotates on the pivot M, and is thus held in place. The thickness of the arm-plate G H I corresponds to the thickness of the projecting lugs S and pivot M, therefore the arm-plate will readily rotate between the cap F and standard-plate J. The cap F is kept from rotating by means of pins K K projecting out from the lugs S, and through the cap, and it is fastened to the pivot M by a screw Z. The rubbers L can be cut a little long, so as to cushion the plate F and thus prevent noise.

I do not claim a foldingseat hinge, as such devices are old; but confine myself to the following claim I claim and desire to secure by Letters Patent- A hinge or joint for folding seats for schooldesks, consisting of the standard-plate J armplate I, and capplate F, when constructed and combined as and for the purpose set forth.

JOHN B. SHERWOOD.

Witnesses:

G. L. CHAPIN, H. L. WAIL.

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