US183402A - Improvement in school-desks - Google Patents

Description

M. LANCASTER.

SCHOOL DESKS. l Nn.183,4:02. v Patented 0ct.17, 1876.

N. PETERS, FHCTO-LITHOGRAPHER, WASNINGYONA D C.

NITED STATES PATENT OFFICEo MORRIS LANCASTER, OF RICHMOND, INDIANA.

IMPROVEMENT IN SCHOOL-DESKS.

Specification forming part of Letters Patent No. 183,402tdated October 17, 1876; application led June 19, 1876.

To all whom 'it may concern Be it known that I, MORRIS LANCASTER, of Richmond, State of Indiana, have invented an Improvement in Falling-Lid School-Desks, of which the-following is a specification:

This invention relates to certain improvements in school-desks; and consists in a paWl-'secured to the standard supporting the desk, and adapted to engage with or be disengaged `from a stop (with which it registers) automatically by the movement of the lid of the disk upon its hinge or pivot, as Will hereinafter more fully appear.

In the drawing, Figure l represents an end elevation of my improved desk; and Fig. 2, a vertical sectional view, showing the Working mechanism ofthe same.

The letter a represents the desk-lid; 11,rhe desk-body, and c the standards by which the same is spported. The desk-lid is secured, as usual, to the arms a', pivoted or hinged to the inside of the standards. The inner ends of' said arms are enlarged, and either or both of them provided with a shoulder, F, the object of which will be hereinafter explained. The rear end of the arm is curved, and along such curved portion, on the face of the enlarged portion of the arm, is formed an inclined cam, commencingat the shoulder and terminating in a thin edge 'at the upper edge of the enlarged portion of the arm.

The letter d represents a stop, consisting of a straight bar loosely secured at its rear end to the body b, and extending forward to the rear of the enlarged portion of the arm a. Said rod is capable of a slight laterall movement, and is kept pressed to the standard by means of a spring, E, securely attached to the lower part of the same. The letter F represents a stop setting over the bar d, to prevent it from being thrown upward out of position.

The operation of my invention is as follows:

When the lid is down in the position shown at a3 the end of the rodd sets in the recess under the lid of the desk, below the front it is rst elevated to the position indicated by a4, in which position the end g of the inclined cam at the rear of the enlarged portion ofthe arm falls under the bar, When the lid can be depressed, the end of the bar being pressed outwardly by the cam, causing the shoulder to pass clear of -said bar, which rests against the face of the enlarged portion until the lid is fully dropped, when it falls under the curved front part of said enlarged portion, being forced therein by the action ot' the spring E, in which 'position it is ready to again engage the shoulder F When the lid is again elevated.

I do not claim a hinged lid in combination with a pawl or dog attached to the same, and registering automatically with a stop on the standard by the operation of the lid, as such forms the subject of'a separate application by me, filed June 28, 1876.

What I claim, and desire to secure by Letters Patent, is

l. The pawl d, securedl to the standard which supports the desk, and adapted to engage with or be disengaged from a stop automatically by themovement of. the lid of the desk on its hinge or pivot, substantially as described, for the object herein set forth.

2. The horizontal bar d, pivoted at its rear end to the standard ofl the desk, i-n combination with the spring E and lid-supporting arm a', having the cam-surface and shoulders or stops g and F at its rear end, substantially as shown and described.

MORRIS LANCASTER.

Witnesses:

. M. P. WRIGHT, I. LANCASTER.

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