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Publication numberUS3699609 A
Publication typeGrant
Publication dateOct 24, 1972
Filing dateApr 12, 1971
Priority dateApr 12, 1971
Publication numberUS 3699609 A, US 3699609A, US-A-3699609, US3699609 A, US3699609A
InventorsSpatz William L
Original AssigneeSpatz William L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Spring loaded caster for shop tools, bar stools and the like
US 3699609 A
An improved caster for the bottom of a stool or other furniture item, the caster comprising a casing containing a compression spring which bears adjustably against a spherical steel ball engaging a floor or supporting surface.
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Claims  available in
Description  (OCR text may contain errors)

United States Patent Spatz SPRING LOADED CASTER FOR SHOP TOOLS, BAR STOOLS AND THE LIKE Inventor: William L. Spatz, Route 2, PO. Box

194-A, Montevallo, Ala. 35115 Filed: April 12, 1971 Appl. No.: 133,245

Related us. Application Data Substitute for Ser. No. 801,982, Feb. 25, 1969, abandoned.

US. Cl. ..l6/44 Int. Cl. ..A47b 91/00 Field of Search .....l6/44, 26, 19; 248/l88.9, 21,

[ 1 Oct. 24, 1972 [56] References Cited UNITED STATES PATENTS 2,176,551 10/1939 Solem ..16/44 7/1963 Rabelos "16/44 Primary Examiner-Bobby R. Gay Assistant Examiner-Doris L. Troutman [57] ABSTRACT An improved caster for the bottom of a stool or other furniture item, the caster comprising a casing containing a compression spring which bears adjustably against a spherical steel ball engaging a floor or supporting surface.

1 Claim, 2 Drawing Figures SPRING LOADED CASTER FOR SHOP TOOLS, BAR STOOLS AND THE LIKE This is a substitute application for my application filed Feb. 25, 1969, Ser. No. 801,982, Group Art Unit 357, now abandoned.

This invention relates generally to furniture casters.

A principal object of the present invention is to provide an improved caster having a rotatable spherical ball for engaging a supporting surface, and wherein the ball is spring loaded for frictional controlling of the rotation thereof.

Another object is to provide an improved caster wherein the spring tension on the ball is manually adjustable for controlling the slidable mobility of the stool across a floor.

Another object is to provide an improved caster wherein the ball is spring loaded in a selected angular direction so to absorb external shock in a specific direction, and which would accordingly be suitable in specific areas subject to the same.

Other objects are to provide a spring loaded caster for stools and the like which is simple in design, inexpensive to manufacture, rugged in construction, easy to use and efficient in operation.

These and other objects will be readily evident upon a study of the following specification and the accompanying drawing wherein:

FIG. 1 is a side cross Sectional view of one form of the present invention, and

FIG. 2 is a similar view of a modified form thereof.

Referring now to the drawing in detail, and more specifically to FIG. 1, the reference numeral represents a spring loaded caster for stools and the like according to the present invention, wherein there is a case 11 having a central chamber 12, the case having a cylindrical side wall 13, top wall 14 and bottom wall 15. The top wall has an opening 16 receiving a shaft 17 secured to a stool leg. A set screw 18 in the side wall secures the leg at a selected elevation. A flat end flange 19 on the shaft bears against one end of a compression coil spring 20, the opposite end of the spring bearing against washer 21 seated on spherical steel ball 22. The ball is rotatable within a seat 23 of the bottom wall the ball extending downward through the wall.

In operative use, tension against the ball is manually adjustable by means of the screw 18, so to control the rollability thereof.

In FIG. 2 a modifiedconstruction 24 includes the above parts, but additionally incorporated the following modification. The set screw 18 extends into a key way 25 of the shaft so to prevent rotation of the caster unit; the screw bearing against the key way bottom wall. Also the lower end of the spring 20 bears against a bearing block 26 fitted over the upper end of the ball; the block being angularly adjustable by a set screw 27 selectively receivable in threaded openings 28 in the case side wall 13; the block 26 having conical side 29 against which the screw 27 bears. Thus an angular direction of force is applied against a floor so to resist horizontal travel in a particular direction, such as when upon inclined floors such as on a ship deck or the like.

The novel features and the operation of this device will be apparent from the foregoing description. While the device has been shown and the structure described in detail, it is obvious that this is not to be considered limited to the exact for m disclosed, and that changes may be made therein within the scope and spirit 0 e invention.

Having thus set forth and disclosed the nature of this invention, what is claimed is: I

1. In a caster for stools and the like, the combination of a case, a rotatable ball supported on a lower end of said case for engaging a supporting floor, means for securement to a lower end of a stool leg, and means for frictional adjustable to control the rollability of said ball on said floor, wherein said securement means to said stool leg comprises a shaft secured to said leg, said shaft extending through an opening in an upper end wall of said case, a compression spring bearing against a bottom face of said shaft and at its opposite end bearing against a block fitted over said ball, and said adjustable means comprising a set screw in said case securable against a side of said shaft, wherein said block has a conical wall, said case has a plurality of radial, threaded openings selectively receiving a screw adjustably engaging said conical wall of said block for providing angular force by said spring against said ball.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2176551 *Feb 13, 1939Oct 17, 1939Arthur C SolemSafety caster
US3096536 *Mar 31, 1961Jul 9, 1963Roll Lok CorpRetractable ball caster
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4491335 *Mar 30, 1982Jan 1, 1985Amos EvronInfants' carriages
US5727285 *May 13, 1996Mar 17, 1998Deere & CompanyCaster wheel biasing mechanism
US6473935 *May 21, 2001Nov 5, 2002Hema CherukuriRetractable roller mechanism
US6637072Sep 17, 2001Oct 28, 2003Formway Furniture LimitedCastored base for an office chair
US6719256 *Aug 13, 2002Apr 13, 2004Produktutveckling I Sverige HbFurniture leg glide
US6892784Mar 6, 2003May 17, 2005Paul A. MaasStabilized portable room divider
US7096533Jun 12, 2004Aug 29, 2006Kruegar International, Inc.Locking roller for an article of furniture
US7810769Aug 8, 2006Oct 12, 2010Krueger International, Inc.Roller foot for an article of furniture
US20050205122 *Oct 22, 2004Sep 22, 2005Bly Robert RGlide cap for walker
US20050273973 *Jun 12, 2004Dec 15, 2005Griepentrog Dennis GLocking roller for an article of furniture
U.S. Classification16/44
International ClassificationB60B33/00, B60B33/08
Cooperative ClassificationB60B33/08
European ClassificationB60B33/08