US1617294A - Method of making chair glides - Google Patents

Description

Feb. 8,1927.

W. RAEBURN METHOD OF MAKING CHAIR GLIDES 7 Filed Feb. 16," 1925 1 Tar-11- INVENTOR ATTORNEYJ produce a novel method of making a circular chair glide havlng securing prongs located I Patented Feb. 8, 1927.

CONNECTICUT. i

mras tamer MET-HOD or MAKING. CHAIR: GLIDES.

Application filed. February My invention relates to the manufacture of chair glides and has for its object to pro- "duce anew and improved method 0t making the same. An object of'myinvention is to V at points inside of a circular rim, so as to enter the wood. in the chair farther from the edge than they would if extending fromthe circular rim. Anotherobject of my invention is to provide a new and improved method in which the chair glide will be' more accuratelyformed and in which the work done in the final operation shall be reduced. Another object of my invention is to provide a novel method of making a chair glide having prongs whose bases are located below the plane of the edge or upper plane of the disk and in which the prongs are reinforced by having the rim of the disk engage the rear face of theprongs. Another object of my invention is to pm.

vide a novel methodwhereby'in the cupping operation projections upon thecupped" portion will be brought behind the prongsand intoposition to be further acted-upon in the succeeding step with a combined bending and swedging action. 7

Sheetinetal chair glides commonlyused have the prongs extending from a circular rimso that they are in some cases so near to the periphery of the chair leg to which they are applied as to cause the wood to split. Attempts have been made to avoid the difficulty due to the peripheral prongs and this has been done by indenting the 'po-rtionof the rim from which the prongs e tend, thus sacrificing the circular form of the glide, to the disadvantage of the product in other respects. In glides made by my method the advantages of the inset prongs and'the circular form are both preserved.

.The following is adescription of myime I proved process embodying my invention, reference being had to the accompanying drawings; in which Fig. 1 shows in perspective a chair with glides .on the bottoms of thelegs thereof;

Figfiilis ablank used in. makingchair glides according to my method; Figs. 3 and 4 are a plan view and' a side elevation of the blank of Fig.2 after per-- forming the first forming step thereon;

16, 1925. Serial No. 9.552.

.5'5,- Fig. 3; 7

Figs. 6 and 7 are plan and side elevations of the second forming step of my process; Fig. 8 is a section on the line 88, Fig. 6; Figs. 9 and 10 are plan and side elevations ofthe completely formed glide, ready tobe hardened and polished; and V Fig. 11 is a section of the glide on the'line 11 11, Fig. 9. I v

In carrying out my process I first strike out asheet-steel blank in the form shown in Fig. 2 having three peripheral arcs 2 with extensions 4 between them. I then subto the action of suitable dies and with one rtur orrlca WILLIAM BAEBUBN', or WATERBURIJCONNECTICUT, Assrenon To HE. MATiATUCK MANUFACTURING COMPANY, or WATER/BURY, CONNECTICUT, A CORPORATION or stroke severthe centralportions 6 of the extensions 4 from the lateral portions thereof I along the lines 55 producing prongs 6 and bending the same upward as is shown in Figs. 4 and 5 and leaving projections 8-8 adjacent to each prong. I then subject the product shown in Fig. 3 to the action of ordinary cupping dies and with a single stroke form it into the shape shown in Figs. 6 and 7. In this cupping action a concavo-convex face is formed and the prongs Gare brought into a vertical position so as to be parallel to one another, and the projections 8 are brought behind their adjacent prongs, as shown most clearly in Fig. 7. The two projections constituting any. pair of projections are at this stage inclined toward one another behind their adj acent prongs at points above from the cupping of the device shown in Figs. 4 and 5 and leaves the projections in a position so that when they are bent the plane of the edge portions between the i several pairs of projections. This results down and swaged they are brought in close contact with one another, as shown in Fig.

jections 8.8 brings them downby a bend- 10. The product shown in Figs. 6 and 7 is Q then subjected to another set of dies one of which has a portion passing outside the par- .allel prongs 66 and engaging the pro- ,7

ing and -swedgingaction into the position shown at 12 in Figs. 9 and ,10.

. In the'resulting product. the prongs are inside the rim of the glide, the body of the glide itselfbeing. circular, and the projections 12 are behind the prongs so as to ens gage the same throughout their Width and Well above their bases and reinforce them Lil so as to enable them to withstand the blows hit in applying the glide to the leg of the chair, as shown at 14, Fig. 1. The distance between the outer surfaces of the prongs and the axis of the glide is thus equal to the dis tance between the inner surfaces of the rim and also the projections 12 and that axis. The bending and swedging action to'which the projections 8-8 are subjected brings the metal of two adjacent projections into close contact as shown at 12.. Figs. 9- and; 10, thereby fully completing the circular rim of the glide and closing the opening, which would otherwise be left by cutting the metal so as to disconnect theprong-s 6 from the rim.

although 'ree nfo-rced-thereby. The. bases of;

the prongs are approximately in the plane of theifront'face 16, of the cuppeddisk distinguished"from being in the plane of the rim or rear face of the cupped disk, this be.- ing necessary inorder to securev a sheet. metal chair glide of truly circular shape free from peripheral openings.

The metal employed in carrying out my process is sheet steel and after the product shown in. Figs. 9.and 10 is obtained, this product is subjected to any suitable harden mg process and then polished to make it ready for. the market. One of the great ad.-

vantages of my process is that in cuppingthe product shown in Figs. 3 and a it is bya single stroke broughtinto the form shown in Figs. 6 and 7 with, the projections 8 extending partially behind thefprongs fi and inclined so thatby a single blow of. com

paratively-light pressure. they can bent and swedged down into the position shown in Figs. 9 and 10. This automatic positioning of the projections 8 asshown in Figs. 6 and T insures the accurate bending and swaging of the prongs in the next succeeding step.

In carrying out my process l'prefierably in the first forming step leav the prongs 6 at an ngle o ach' ther, iidou ard y ll-'f clined to the central portion 18, as" shown in Figs. 4:, and 5, thus contributing to theease. in placing the partiallyi'formed chair glide in the dies for the "next succeeding operation. At the end of this step the pro v jections 88 are in the plane of' the portion 18, which insures the proper action in the succeeding cupping'istep. T b

As will be evident to'thoseflskilled" in the February,ll 925.* f c r s Water art, my invention permits of various modifications without departing fromthe spirit thereof or the scope of the appended claims.

What I claim is: V l r 1. In the method of producing chair glides, the improvement which consists in forming a cup-shaped body with a plurality of pairs of'projections extending from its rim and a corresponding plurality of prongs having their outer surfaces removed from the axis ofsaid body to substantially the same extent as the inner surfaces of the cup rim and of saidprojections, each prong beingadjacent to. the space between the menibers of, one pair of said projections and be tween said projections and the axis of. the cup, and then forcing the metal of said pro; jection downwardly behind said outer: sur-. faces of said prongs.

2. In the method glides, the improvement which, consists in forming a blank having a plurality ofout-l I wardly extending portions,then forming up:

wardly extending, prongsfrom thefcentr'al parts ofeach of-said, portions and leaving pro ections adjacent to said prongs, then cupping this product so as to bring the axes of said prongs substantially parallel aiid to of producing chair.

bend said projections'behind their adjacent p ong nd he or g ai projecti ns downwardly behind said prongs.

3. In .the method of producing chair glides,the improvementwhich consists of forming a blank havinga plurality of outwardly extending portions, then forming upwardly and outwardly extending; prongs from the central portion of eachof said portions andleaving projectionsadjacent to the sides of said prongs and inthe plane of the body of said blank, then cupping thisproduct so as to bring the axes of said prongs substantially parallel and to bend said. projections behindtheir adjacent prongs, and then forcing said projections downwardly behind said prongs. v

4.111 the method of producing chair glides, the improvement which' consists in forming a blank having a plurality .of..0ut'

wardly extending portions, then formingupwardly extending prongs from the central parts of. each of said portions and leaving laterally extending projections adjacent to said prongs, then cupping this product so" as to form a concavoconvex face, to bring the axes of'sa-ld prongs substantially parallel are inclinedtoward one another behind their adjacentprongs at points 'above 'the plane 'jections downwardly behind said prongs. I

In testimony whereof, I havesigned my and to bend said projections so that they name to this specification this of

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