US2630857A

US2630857A - Attaching device for chair backs

Info

Publication number: US2630857A
Application number: US209271A
Authority: US
Inventors: Morton R Cohen
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-02-03
Filing date: 1951-02-03
Publication date: 1953-03-10
Anticipated expiration: 1970-03-10

Description

Mmh 10,1953 R, COHEN 2,630,857

ATTACHING DEVICE FOR CHAIR BACKS Filed Feb. 3, 1951 INVENTOR. fZZa/v aa CEfi/zeiz Patented Mar. 10, 1953 UNITED STATES PATENT OFFICE ATTACHING DEVICE FOR CHAIR BACKS Morton R. Cohen, Chicago, Ill.

Application February 3, 1951, Serial No. 209,271

2 Claims. 1

My invention relates to chrome style chairs, and more particularly to the upright tubular stems rising from the rear thereof to which the back of the chair is attached, and one object of the present invention is to provide an eflicient device for attaching the chair back to the stems referred to by simple manual effort.

A further object is to provide an attaching device of the above character which requires no tools of any kind for its operation.

Another object is to design the novel attaching device along lines of rigidity and simplicity.

With the above objects in view and any others which may suggest themselves from the description to follow, a better understanding of the invention may be had by reference to the accompanying drawing, in which- Fig. 1 is a side elevation of a typical chrome style chair showing its back mounted by means of the novel attaching device;

Fig. 2 is a front elevation of the showing, showing in Fig. 1;

Fig. 3 is a magnified section taken on the line 3-3 of Fig. 2; and

Figs. 4 and 5 are, respectively, sections taken on the lines 4-4 and 55 of Fig. 3.

In accordance with the foregoing, specific reference to the drawing indicates the seat for the chair at I0, and the tubular stems rising in back of the same at I l. The chair back is a board I2 of substantially rectangular form and concaved in the center; and it may be upholstered or covered in any suitable manner.

For the purposes of the present invention, the back I2 is bored from the bottom at laterallyspaced points corresponding with the positions of the chair stems I I, such bores being of a depth and diameter to snugly receive the upper portions of the stems as indicated in Fig. 3. The bores are numbered I5, and they are continued in upward directions with bores I6 of a considerably smaller diameter.

The chair back I2 is designed to receive a unit in its bores I5 and I6 which facilitates the attachment of the back to the chair stems I I when the latter are received in the bores I5 as previously described. The unit referred to is primarily in the form of a solid metallic disc I8 of a diameter to make a snug fit in the bore I5. A long plug 20 projects from one end of the disc, while a similar but shorter stem 2! projects from the other end thereof The plug 20 is formed with a series of longitudinally spaced annular ribs 23, while the stem ZI is smooth to the extent of its outer end portion to which is welded or otherwise attached a concavo-convex circular plate 2 24, the stem 2| being directed into the hollow of the plate. The latter is formed with an annular series of scallops 25 which are beveled from the outer side of the plate to present sharp edges 26.

The plugs 20 and their ribs 23 are of a diameter to make a driving fit into the back bores l6, such fit being completed when the discs I8 meet the inner ends of the bores I5. The stems 2| and their bottom plates 24 now depend into the bores I 5; and such stems and bottom plates serve as attaching devices when applied to the chair stems II.

The mounting of the chair back on the stems II is effected by simply pressing it down to receive the stems in the bores I5. As the stems rise in the bores they encounter and slightly flex the scallops 25 of the plate 24 in an inward direction, the perimeter of the scallops being of a very slightly greater diameter than the bore of the stems. When the stems II have entered the chair back to a point where they meet the disc I8 the attachment of the chair back is completed. Such attachment not only comprises the frictional fit of the chair back with the chair stems I I, but also the engagement of the scallops 25 with the stem walls in a manner to resist tendencies for the back to separate from the stems. It is understood that such tendencies will operate to unflex or expand the plate 24, which action will cause its scallops 25 to bury their edges firmly in the walls of the stems II, so that in this manner tendencies to withdraw the chair back in case it loosens on the stems I I will be positively resisted.

It will now be apparent that the novel attaching device is of a nature to exert a strong grip on the stems of the chair once it has been installed in the chair back and the latter operated as described. The construction of the attachment is not only massive, but also of a nature to become tightly embedded in the stock of the chair back, so that to all intents and purposes the attachment forms a part of the same. The chair back is therefore ready at any time for application to the stems I I; and this may be done by any person by simply mounting the back over the tems as previously described and pushing down until the limit of assembly is reached. Now the chair and its back are rigidly assembled as if made in one piece. Yet, packing and shipping of the chair before its assembly is facilitated by having the back made separately, this circumstance enabling the chair to be packed in a much smaller carton or container than if the back were assembled with the chair at the factory. Obviously, space and container costs are cut down; and economy is also effected in shipping. When the chair is unpacked at the store or other place of destination it is an easy matter for the back to be mounted without the use of any tools or extra parts, thus expediting the assembly of the chair, The invention thus comprises a highly efiicient development from the viewpoints of packing and shipping economy, time saving and durability.

While I have described the invention along specific lines, various minor changes or refinements may be made therein without departing from its principle, and I reserve the right to employ all such changes and refinements as may come within the scope and spirit of the appended claims.

I claim:

1. In a chair having a pair of upwardly projected tubular stems and a back designed for application to the same, upward bores in the bottom of said back in registration with said stems and adapted to receive the same on the application and depression of the back, and units carried by the latter and formed with elements which enter and secure frictional engagement with the walls of said stems on said depression, said back having bores continued from the original ones and of a lesser cross-section, a plug rising from each of said units and driven tightly into the related continuation bore of said back to secure a support for the unit therein, and an enlargement between each unit and its plug serving as a stop for the driving thereof when meeting the end of the related original bore, said enlargement also serving as an abutment for the upper end of the related stem.

2. The structure of claim 1, said enlargement being a transverse disc seating the upper ends of said stems.

MORTON R. COHEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,083,697 Neptune Jan. 6, 1914 1,659,572 Klemm Feb. 21, 1928 1,734,340 Overton Nov. 5, 1929 1,813,072 Murdock July 7, 1931 1,817,775 Sipe Aug. 4, 1931 1,871,668 Dawson Aug. 16, 1932 1,880,133 Hassensall Sept. 27, 1932 2,306,878 Greitzer Dec. 29, 1942 2,525,126 Greitzer Oct. 10, 1950 FOREIGN PATENTS Number Country Date 524,194 France May 9, 1921