US1534578A - Chair glide - Google Patents

Description

April 21,1925,

W. E. FlELDlNG CHAIR GLIDE File d D96 l1 1924 ATTORNEYJ Fatented 21, i925.

UNITED STATES PATENT OFFICEF WILLIAM E. FIELDING, 01] WATEBBURY, CONNECTICUT, ASSIGNOR TO THE MATTA- TUCK MANUFACTURING COMPANY, OF WATERBURY, CONNECTICUT, A CORPORA- TION OF CONNECTICUT.

oHArn GLIDE.

Application filed December 11, 1924. Serial No. 755,314.

To all whom it may concern:

Be it known that I, IVILLIAr. E. FIELDING,

a citizen of the United States, residing at- Waterbury, county of New Haven, State of Connecticut, have'invented a certain new and" useful Improvement in Chair Glides, of which the following is a full, clear, and exact description.

7 My invention relatesto chair glides and has for its object to produce a dished circular sheet metal chair glide having reenforced prongs located within the edge thereof and having the bases of said prongs located in the plane corresponding approximately with the inner surface of the bottom of the glide and removed from the plane passing through the upper surface of the edge. In sheet metal chair glides heretofore made and provided with upturned strength- 'ening rims, the prongs have in some cases been extensions from circular rims and located in the cylindrical extension thereof. This is objectionable in many instances since it brings the prongs too near to the periphery of the end ofthe chair leg to which they are to be attached. In other cases the glides have been distorted so that a prong bearing rim, at and adjacent to its prong bearing portions, is bent inward so as to bring the prongs nearer the center. This distortion of the glide is objectionable, the circular form being preferable.

In my glide the circular form of the glide is maintained and the prongs are nevertheless located nearer the center than the edge, being cutback so as to be within the edge. The prongs are, therefore, more remote from the periphery of the end of the. leg to which they are to be attached so that they are less liable to split the leg. My glide, therefore,

Fig. 5 is asection of the device of Fig.

3 on the line. 55, Fig. 3'; v

Fig. 6 is a plan view of the finished product embodying my invention; v

' Fig. 7 is side elevation of the same; and

Fig. 8 is a section on the line 7+7, F ig. 6.

Referring to the drawings, Figs. 6, 7, and 8, 2 is the bottom surface of the dished chair glide. l are three prongs whose bases are located substantially in the plane of the bottom of the chair glide. 6 is the edge of the chair glide and 88 are portions integral with the edge which are made to lie behind the prongs so as to laterally reenforce the same.

This chair glide is formed of sheet steel and after it is shaped in suitable dies is hardened so as to be glass hard by any suitable process. After hardening the glides are tumbled in a tumbling barrel so as to be polished on their lower surfaces.

In forming this glide I first form a blank of steel, as shown in Fig. 2, the same having arcuate sections 10 and three projections 12. These projections are so shaped that they can be sheared or out along dotted lines 1a, shown in Fig. 2, leaving three tongues and adjacent to each side of each tongue a projection for the purpose herein specified. For clearness the width of the shearing cuts shown in dots in Figs. 2 and full lines in Figs. 3 and 4 is exaggerated so as to show spaces. These spaces, however, are not necessary in actual practice, mere severing cuts as shown in Fig. 6 being sufficient.

In forming the chair glide I first submit the blank to the action of dies which dish the same slightly as shown in Fig. 3 and shear the projections 12 so as to divide each of them into three parts along the lines shown in dots at 14 in Fig. 2, forming prongs 4 and ears 20, 22 separated by shear cuts 16, simultaneously bending the prongs upward and forcing them inward so that they are displaced and would lie within a cylinder in alinement with the edge. This produces the interrupted edge device shown in Figs. 3, 4 and 5. After this device is produced I subject the same to swaging dies which bend the ears 20 and 22 laterally, forming eXtensions 88 behind the prongs 4, the inner faces of the extensions engaging the outer faces of the prongs as shown in Figs. 6, 7 and 8 thus completing the shaping of the chair 'lide.

After the glides are thus shaped they are subjected to the usual hardening process so to render them glass hard and then polished in a tumbling barrel.

In this way a dished glide is secured which is circular and provided with an ample gliding or bearing surface and in which the prongs are located within an interrupted edge and laterally reenforced as hereinbefore set forth, their bases being substantially in the plane of the face or lower portion of the glide,

The glide with the prongs thus formed, because the prongs are brought nearer to the center of the glide are less liable to split the leg of the cha1r to which they may be applied. The portions 8, 8 reenforce the prongs 4 so that they are as strong as though they were shorter and constituted continuations of or projections from an upturned rim.

1 preferably form a chair glide with three prongs but as is evident my invention permits of various modifications without departing from the spirit thereof or the scope of the appended claim.

\Vhat I claim is:

An integral dished chair glide made of sheet metal and having a circular form and provided with an interrupted edge and prongs located within said edge having their bases in a plane below the plane of said edge, said interrupted edge having portions extending in front of the outer faces of said prongs, the inner faces of said extensions engaging said outer faces of said prongs and reenforcing said prongs.

In testimony whereof I have signed my name to this specification, this 10th day of December 1924.

XVILLIAM E. FIELDING.

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