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Publication numberUS475076 A
Publication typeGrant
Publication dateMay 17, 1892
Filing dateFeb 27, 1891
Publication numberUS 475076 A, US 475076A, US-A-475076, US475076 A, US475076A
InventorsFrancis R. Beal
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 475076 A
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Description  (OCR text may contain errors)

(No'Model.) v



No. 475,076. l Patented May 17, 1892.-

ers skilled in the art to which it appertains to is a horizontal section ou the line Fig. 1.




lSPECIFICATION.forming part of Letters Patent No. 475,076, dated May 17, 1892.

Application filed February 27, 1891 To a/ZZ whom it may concern,.-

Be it known that I, FRANCIS R. BEAL, a citizen of the United States, residing at Northville, county of Vayne, State of Michigan, have invented a certain new and useful Improvement in School-Seats; and I declare the following to be a full, clear, and exact description of the invention, such as will enable othmake and use the same, referencebeing had to the accompanying drawings, which form a part of this specification.

My invention relates to certain new and useful improvements in seats, and more particularly to school-seats.

My invention relates to the general construction, arrangement, and combination of devices and appliances hereinafter specified and claimed, and illustrated in the accompa- -nying drawings, in which- Figure l is a vertical section of a seat and accompanying desk, showing, also, in dotted outline the seat partially rotated. Fig. 2 is a separate view of the intermediate socket. Fig. 3 is an inverted View of the spider and the supporting-shaft in perspective. Fig. 4

Fig. 5 is a similar section on the line/yy, Fig. l. Fig. 6 is an enlarged view of certain details in section, showing a modification of portions of the device illustrated in Fig. 1.

A represents the seat proper, provided with a back A and with a supporting-shaft A2 engaged therewith in any suitable manner, as by means of a spider A3.

B represents the base or pedestal, the same being constructed with a socket, as shownat b, provided with one or more threads b. The base and socket at its upper end is preferably made integral, as shown.

Instead of engaging the shaft A2 directly in the base, my invention contemplates the employment of an intermediate socket C, screw-threaded at its lower end to form a screw-threaded engagement inthe socket b of the base B. In this manner it will be seen the socket C is vertically adjustable in the base to adjust the height of the seat as desired. The socket C is constructed to receive the shaft A2 upon the seat proper, the shaft being rotatable therein. My invention contem- Serial No. 383,124. (No model.)

plates, however, the limitation of the rotation of the shaft in the socket C so that the back A of the seat will be prevented' from striking the edge of the desk D in front of it, as the seat is rotated either to the right or to the left, as would be the case if the rotation of the seat were not so limited. tation of the rotation as shown, I construct the top of the socket C with a shoulder c, extending a suitable distance above its upper edge, leaving a recess c opposite said shoulder. The spider A3 is also constructed with a shoulder a, adapted to engage in the re' cess c' of the socket C and to strike against the extremities of the shoulder c, when the seat 'is rotated to a desired distance in either direction, and thereby stop the farther rotation ot the seat in that direction. When the socket C hasbeen vertically adj usted to carry the'seat to the desired height, the socket may be held in such a given position and prevented from turning by means of a set-screw b2, located in the base.

It will be obvious, also, that in so securing the socket C in a given position it is essential to always locate the shoulder c toward'the rear of the seat toeect the desired limitation of the rotation of the seat. To this end the socket C may be formed with a recess or groove c2, which when brought opposite the set-screw will bring the shoulder cinto proper position, the set-screw being located at the rear of the base and engaged in said groove when tightened in place to hold the socket fromturning.

To prevent the disengagement of the shaft To secure this limiin the socket C, the one is made to interlock the other. To this end the shaft may be formed with a pin or shoulder a2 and the socket C with a groove c3 to receive the said pin or shoulder, the said groove and pin being so located, respectively, as not to be in alignment when the seat is in proper position, thereby preventing any disengagement of the parts until the pin and groove are brought into alignment. The upper end of the socket C is provided with an inwardlyextended flange c4, under which the pin is engaged to hold the shaft in place. Y

I would have it understood that I do not limit myself to the precise details of every feature of the invention as hereinbefore described, as they might be varied without de- 4said socket C directly receiving said supporting-shaft, said shaft rotatable in the socket C Vand nterlocked therewith to prevent their disengagement when the seat is in'normal position, and the socket C and shaft A2, formed the one with a recess and the other with a lshoulder to enter said recess, whereb y the shaft has a limited rotation in said socket, substantially as set forth.

2. The combination, with a seat provided with a supporting-shaft, of a base, an intermediate socket C, having a screw-threaded engagement with the base and Ysupporting said shaft, said socket interlocked at its upper end withsaid shaftto prevent their dis-v engagement when the chair is in normal position and provided with a shoulder c and a recess c between the ends of the shoulder, and said shaft provided with a shoulder ct to engage in said recess to limit the rotation of the shaft in the socket, substantially as described.

3. The combination, with a seat, of a supporting-shaft', a base, an intermediate socket having a vertically-adj ustable engagement with said base and supporting said shaft, said socket formed with a shoulder c and groove c2, both located on the same side of the socket, and the base provided with a set-'screw to engage said groove and hold the socket in a desired position, substantially as described.

4. The combination, with a seat, of a supporting-shaft rigidly engaged therewith, a base and an intermediate socket adjustably engaged with the base, said shaft and socket interlocking one with the other to prevent both their disengagement and also an independent vertical movement of the shaft when the seat is in normal position, said shaft and socket constructed the one with a recess and the other with a 'shoulder entering said recess, said shaft thereby-having a limited rotation lin said socket, substantially as described. v v

5. The combination, with a seat, of -a supporting-shaft engaged therewith'and provided with a shoulder CL2, a base, and an intermediate socket adjustably engaged with the base,

said socket formed with a groove c3 and with an inwardly-extended flange c4 to receive and engage said shoulder to prevent an independent vertical movement of saidshaft when the seat is in normal position, said shaft-and socket the one formed with a recess and the other with'a shoulder enteringv `said recess, the shaft thereby having alimited rotation in said socket, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

FRANCISv R. BEAL. lVitnesses:


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2865430 *Jan 22, 1957Dec 23, 1958Frithjof FolknerArrangement in dismountable office swivel chairs
US6550728Aug 2, 2002Apr 22, 2003Heidt Products Inc.Height adjustable table
Cooperative ClassificationA47C3/26