To all whom it may concern :
Be it known that I OLE PEDERSON Of Columbus in the county of Franklin and State of Ohio have invented certain new and useful Improvements in Furniture-Casters; and I do hereby declare the following to be a full clear and exact description of the invention sufficient to enable one skilled in the art to which it be-longs to make and use the same without furio ther invention or experiment reference being
had to the drawings hereunto annexed in
which
Figure 1 represents a sectional side view of my caster as applied to the leg of a piece of
15 furniture; Fig. 2 an elevation of the same de tached showing section of ground - rollers. Fig. 3 is a horizontal section taken at I J Fig. 1.
My invention relates to certain improve-
20 ments in furniture-casters; and it consists of a peculiarly-shaped single shank with vertical stem cast loosely therein having upon each side and solidly connected with said shank two inclined conical pivots carrying two oblique
25 ground-rollers.
Referring to the drawings C is the shank
D the vertical stem and B and B' the two
conical pivots carrying ground-rollers A A.
It will be seen that the axes of said pivots are 3o inclined sufficiently to cause their under sides to attain a horizontal position which inclination by pitching the tops of said rollers out-ward and the bottoms inward—i. e. toward each other—counteracts any tendency of the rollers to crowd the outer end of the pivots. I am aware that inclined pivots for pitching the rollers outward are not new and there-fore I do not claim such pivots broadly. The conical shape of my pivots aids materially in holding the rollers steadily in position. The vertical stem D is constructed with a solid flange or shoulder E' made integral with the stem whereby I am enabled to drive the stem into the leg of the furniture without injury to the rest of the caster.
Fig. 2 shows the rollers secured on pivots
by screw as in B or solid head or knob as
at B'. In the latter case rollers must be cast
first and cleaned then set up in the mold in
50 which the shank is'to be cast allowing the
liquid metal to flow through their eyes forming a knob upon the outside. This chills the metal and if it be "chilling-iron " renders the pivots extremely hard and durable. The metal in cooling shrinks away from the rollers allowing them ample freedom to turn.
Again referring to the drawings it will be seen that the vertical stem B consists in part of a fluted portion D that engages with the wood in which it is driven. The hole being 6o bored somewhat smaller causes it (the wood) to take a firm hold upon the stew retaining it securely in place. The journal of said stem consists of a conical part D"' in the top of which is the annular groove I)" which en-gaging with metal of shank keeps it from falling off when raised. Said conical portion of stem is terminated by the cylindrical part d which rests in the step d' formed on the side of the shank and which receives the down-ward thrust of the stem as shown in Fig. I. Like the ground-rollers it is necessary to cast the said stein first and set it up in the mold and let the metal of shank flow around it and form the solid flange or shoulder E'; but as the shrinkage of metal in this case would tend to bind and prevent stem from turning freely it will be found necessary to cover the surface of said stem with some substance like sand and shellac prior to setting up to preserve 8o sufficient space between surfaces.
It will thus be seen from the foregoing owing to the limited amount of fitting necessary that great economy is attained and from the extreme hardness of wearing-surfaces 85 great durability the whole thrust of the stein being on the step d'.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is-
1. The vertical stem D having the fluted portion D' substantially as and for the purpose shown and de cribed.
2. The vertical sTem D having the fluted portion Di in combination with the shank C provided with the inclined pivots B B' connected solidly therewith and the oblique ground-rollers A A all constructed to operate substantially as and for the purpose de-scribed.
5
35 40 45
55
65 70 75
99
95 100

3. In a furniture-caster the bearing-frame 5. The shank C provided with the collar F C provided with the step d' and collar E in having the lip i substantially as set forth. combination with a spindle substantially as
and for the purpose set forth. OLE PEDERSON.
5 4. In a furniture-caster the shank C pro-
vided with conical pivots B B' step d' and Witnesses: -
collar E substantially as and for the purpose GEO.O. MARTIN
set forth. J. M. LowE.