US 277326 A
Description (OCR text may contain errors)
Patented May 8 '15] Q71! 2/? 1 N. PETER$ fhob-Lifhognahw. Washingmn, u c
UNITED STATES PATENT OFFICE.
GEORGE MUNGER, OF EAST RIVER, CONNECTICUT, ASSIGNOR TO BAKER, PRATT 8t 00., OF NEW YORK, N. Y.
SPECIFICATION forming part of Letters Patent No. 277,326, dated May 8, 1883.
Application filed January 11, 1883. (No model.)
T 0 all whom it may concern Be it known that'l, GEORGEMUNGER, of East River, in the county of New Haven and State of Connecticut, have invented anew Improvement in School-Desks; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-
Figure 1 an end View 5 Fig. 2, a vertical section of the joint enlarged; Figs. 3, 4, 5, and 6, detached views of the joint enlarged.
This invention relates to an improvement in that class of school-desks in which the standards are usually made from cast-iron, and in which the seat is hinged at the back, so as to be turned up against the back to make room between the desk and back for the entrance and exit of the pupil, the principal object of the invention being to produce sufficient friction at the joint to retain the seat in any position to which it may be placed, up or down, and so that it cannot fall of its ownweight, thereby avoiding the noise of and disturbance from the fall which would otherwise occur; and the invention consists in the peculiar construction of the joint, whereby a spring-pressure is brought to bear between the stationary and movable parts of thejoint, as more fully hereinafter described; and the invention further consists in the method hereinafter described of attaching the slats to the frame and seat-bars.
A represents the end frame or standard of the seat, which may be of any of the usual or u d esirahle form s, fitted to receive the desk-top B 0 is the seat arm or bearer, which, with the frame, is made from cast-iron.
The stationary part A is constructed with a socket, a, to receive the seat arm or bearer. This socket is cup-shaped, as seen in Fig. 5, end view, and Fig. 6, section on line y 3 At two points within it lugs 11 b are cast upon opposite sides. The arm C is constructed with a similar cup, D, to set on over the socket a, as seen in Fig. 2, with a cup-shaped flange, (1, within it, as seen in Figs. 3 and 4, to enter within the socket and between the lugs b l),
and between the internal flange, d, and the outer edge of the cup lugs e are cast in the arm similar to the lugs b bin the standard. Vithin the internal flange, (l, aspiral or, other suitable torsion spring, f, is placed. Concentrically through the socket and bearing of the arm a bolt, 71, is passed, its head bearing upon a col lar, i, on one side, and the nut on a similar collar, on, on the opposite side, as seen in Fig. 2. The spring f, when at liberty, is considerably longer than the depth of the space within the joint in which it is placed, and so that when secured together, as seen in Fig. 2, the spring is considerably compressed. The lugs c in the arm play between the lugs b b in the socket. Hence the arm may be turned in either directionsay down, which will bring the lugs to a hearing, as seen in broken lines, Fig. 5, and which is the sitting position for the seat; or it may be turned up and the lugs come to a bearin g in nearly the vertical position of the seat, as seen in Fig. 1. The flange d bears upon the inner surface of the lugs b, and the cup also bears upon the outside of the socket, which forms a strong pivotal bearing for the scat, independent of the bolt. The spring: bears axially outward at one end on the stationary part and at the other on the movable part,while outsidethecollarsbear,respectively, on those parts. Hence in turning the arm the outward forceof the spring creates friction between the collars and the two parts sufficient to retain the seat in any position and prevent its falling or coming suddenly or with force upon its downward bearing, and this friction may at any time be adjusted to be greater or less by simply turning the nut onthe bolt h, to increase or reduce the power of the spring. The surfacebearing of the collars being so great, very little pressure will be required to produce the desired result, much lessthan if the bearin g were made simply upon the spring without theintervention of the collars. In some cases say in larger or heavier seatsI make a still further resistance to the fall of the seat by providinga lug on the two parts of the jointone, s, on the one part .to engage one end of the spring, the other, t, on the other part to engage the other end of the spring just before the seat shall have reached its extreme down- ICC ward position. Then in completingthe descent of the seat, the spring will actas a torsionspring to resist but yet permit the complete descent of the seat. In that case the friction may be very much reduced,even so much that the seat might fall by force of gravity as it approaches its downward position, yet this fall would be arrested and its force relieved by the torsional action of the spring. Y
I claim- 1. In a school-desk frame, the combination of the standard A, constructed with a cupshaped socket, a, the arm 0, with a cup-shaped flange, D, to cover said socket, and with a cupshaped flange, (1, within and concentric with the said flange D, and between which and the said flange D the socket enters, the two parts constructed with lugs to support the said arm when down, and the springf, arranged within the cup-shaped flanged, and so that its one end bears against the standard and the other against the arm and in line with the axis of the socket, with a bolt concentrically through the socket to secure the two parts together against the pressure of the spring, substantially as described.
2. In a school-desk frame, the combination of the standard constructed with a cup-shaped socket, the arm with a cup-shaped flange to cover said socket, and with an internal flange to enter said socket, the two parts constructed with lugs to support the seat-arm, a torsionspring arranged within said socket to bear outward against the two parts in an axial line, and a bolt through the said two parts and spring, the two parts constructed each with a lug upon which the respective ends of the spring will bear as the seat descends, substantially as described.
3. In a school-desk frame, the-combination of the standard constructed with acup-shaped socket, and the arm with a cup-shaped flange to cover said socket, and with an internal flange to enter said socket, the said two parts of the socket constructed to engage the'respective ends of the spring, and whereby the descent or fall of the seat will impart to said spring a torsional effect to resist such fall or descent of the seat, substantially asdescribed.
JOHN E. EARLE, Jos. O. EARLE.