US241693A - School-seat and back - Google Patents

Description

' UNITED STATES {PATENT OFFIoE.

ASBURY MOORE, OF SIDNEY, OHIO.

SCHOOL-SEAT AND BACK.

SPECIFICATION forming part of Letters Patent No. 241,693, dated May 17, 1881.

Application filed February 7. 1881. (No model.)

To all whom it may concern Beitknown that I, ASBURY MOORE, of Sidney, in the county of Shelbyand State of Ohio, have invented a new and useful Improvment in School-Seats and Backs; and I do hereby declare that the following is a full, clear, and exact description of the same.

The improved or modern forms of schoolseats, and backs therefor, are constructed of aseries of slats ton gued and grooved to match and glued together, and secured to cross-pieces or hinge-irons by means of screws or analogous devices. These means of fastening the slats have proven unsatisfactory, chiefly on account of the shrinking of the wood, which leaves widening gaps between the slats that cannot be conveniently closed,'and also destroys the rigidity of the seat, so that its usefulness and durability are seriously impaired.

It is the object of my invention to remedy this defect, and to this end I insert arigid iron rod through the slats at each end of the seat and back, and apply a screw-nut to the ends of the rods, for use in drawing the slats closer together to compensate for shrinkage. The rods are likewise attached to iron ribs by means ofiron ties peculiarly constructed and arranged.

In accompanying drawings, forming part of this specification, Figure 1 is an end view, part being broken away, of the seat of a school-desk provided with my improvements. Fig. 2 is a plan view of the same inverted. Fig. 3 is a cross-section on line as to, Fig. 2. Fig. 4 is an end view of aschool-desk and seat-frame, showing a mode of attaching the seat and back thereto .when constructed according to my invention.

The letters A A indicate the several paral lel lengthwise slats of the seat; B, the iron screw-threaded rod inserted through the same O, the iron ribs, and DD the ties that connect the aforesaid parts together. The slats A are bored at each end transversely, parallel to their upper and under sides, andan iron rod, 13, is inserted in the bore thus made. A mortise, a, is formed in the under side of each slat, the location beingsuch thatthe mortise is coincident and communicates with the aforesaid bore. In each of these mortises is placed a metal tie, D, which is perforated at one end to receive the rod B, and provided with shoulders c at the other end, to adapt it to engage with lugs dot the rib O. The rod B obviously requires to be inserted through the ties'D and slats A simultaneously. The tie D, that is placed in the outer or front slat of the seat, is screw-threaded internally, to adapt it to receive the correspondinglymreaded ends of the rod B, Fig. 1, and a nut, E, is applied to the outer or projecting and threaded rear ends of the rod, so thatby screwing up the nut the slats A may be drawn and held tightly together. The outer end of the rod B is likewise inserted through the flange 0 formed on the rear ends of the rib G.

The ribs 0 are constructed of parallel bars, or are rather channeled, as shown in Fig. 2,

and on the inner sides of the same are cast the a wedge-shaped or tapered lugs 01.

It will be seen that by screwing up the nut E the slats A will be drawn together and the lugs cl of ribs 0 G forced tightly under the shoulders on the heads of the ties D D, and thus caused to act as so many cams to draw the parts tightly together. The result is that the seat has great rigidity and strength, and, if shrinkage occurs, it may be easily taken up, so that the seat can never become loose, disjointed, or weak.

I propose to apply the same devices or fastening to the back of the seat as to the latter.

The ribs 0 will also be suitably provided with ears or lugs, to adapt them for hinge attachment to the iron seat-supports, as shown in Fig. 4.

The mortises for the ties may be made in the usual way; but I prefer to bore them with a bit, and hence the perforated ends of the ties are made cylindrical, to adapt them to fit in the bores thus made.

I do not claim, broadly, securing ribs to the slats of a school seat or desk by means of rods or bars passed transversely through the latter and connected with saidv ribs by clamps or 'other devices.

What I claim as new is-- 1. The combination, with a series of seatslats provided with transverse bores, of threaded rods inserted in said bores, the ribs, having wedge-shaped lugs, theties,placed in mortises or slots and perforated to receive the rods, also provided with shoulders for engaging with the wed ge-shaped lugs, and nuts, applied as shown, whereby said parts may be secured rigidly together and adapted for adjustment, as hereinbefore described.

5 2. The combination, with the seat-slats and ribs having wedge-shaped lugs, as specified, of a series of shouldered ties, the threaded rods and nuts, whose adjustment draws the slats and ribs into closer contact, as shown and dei 10' scribed.

3. The combination, with transversely-forced

Images