US3805320A - Article of manufacture - Google Patents

Article of manufacture Download PDF

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Publication number
US3805320A
US3805320A US00319768A US31976872A US3805320A US 3805320 A US3805320 A US 3805320A US 00319768 A US00319768 A US 00319768A US 31976872 A US31976872 A US 31976872A US 3805320 A US3805320 A US 3805320A
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US
United States
Prior art keywords
hub
manufacture
article
outer circumferential
circumferential face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00319768A
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English (en)
Inventor
K Bocksch
W Hensel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mauser KG
Original Assignee
Mauser KG
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Filing date
Publication date
Application filed by Mauser KG filed Critical Mauser KG
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Publication of US3805320A publication Critical patent/US3805320A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/0036—Castors in general; Anti-clogging castors characterised by type of wheels
    • B60B33/0042—Double or twin wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/0028—Construction of wheels; methods of assembling on axle

Definitions

  • a pair of rollers are each journalled on one of these end portions and the hub is provided with a socket by means of which it can be mounted for pivoting movement about an upright axis which is laterally offset from and extends normal to the axle.
  • a nose projects from the outer circumferential face of the hub below the socket and is bounded by two outer surfaces which extend from the outer circumferential face substantially parallel to and circumferentially normal to the axis, respectively.
  • the present invention relates generally to articles of manufacture, and more particularly to a caster for chairs and the like.
  • Casters are already well known in many different types and uses.
  • the present invention is particularly concerned with casters which are employed on chairs and similar seating-type furniture and wherein a circular hub is provided with an axially extending axle on opposite end portions of which are journalled rollers for rotation relative to the hub.
  • the hub itself is provided with a socket in which a pin mounted on the piece of furniture can be received, so that the hub can pivot about an axis which is laterally offset from and extends normal to the axle on which the rollers rotate.
  • chairs and similar types of furniture which are provided with casters have bases of usually cruciform-shaped configuration. The three or more arms or projections of such bases are each provided with a caster.
  • the difficulty with the prior art is that with the particular type of casters with which the present invention is concerned, even a small tilting of the piece of furniture while load is applied to it tends to cause the piece of furniture to roll rearwardly and to fall over forwardly. It is very common in chairs using casters, particularly office chairs, to provide bases having only three legs, or having legs which are relatively short. On the one hand the shortness of the legs in particular is desirable, because it is space saving and reduces the danger that someone walking past the piece of furniture might get his or her feet hooked underneath the base and become tripped.
  • the chair will tip forwardly about the axle, and will then slide rearwardly on the forwardly located casters until a sufficient shifting in the center of gravity has taken place for the chair to tilt over in forward direction.
  • the chair is tilted rearwardly.
  • an object of the present invention to provide such an improved caster which will provide for automatic blocking in the critical tilting range of the casters, so as to prevent a rearward rolling of the casters in the event of a tilting-over movement of the piece of furniture and an unfavorable distribution of the weight of the user on the seat.
  • An additional object of the invention is to provide such a caster which should be uncomplicated in its construction and simple to produce.
  • a caster for chairs and the like which, briefly stated, comprises a circular hub having an outer circumferential face, and an axle extending centrally through this hub and having end portions projecting beyond opposite axial sides thereof.
  • a pair of rollers is located at the opposite axial sides of the hub and each of these is turnably journalled on one of the end portions.
  • Mounting means is provided for mounting the hub turnably about an upright pivot axis which is laterally offset from it extends normal 'to the axle, and a nose projects from the outer circumferential face of the hub below the mounting means and is bounded by two outer surfaces which extend from the outer circumferential face substantially parallel to and substantially normal to the axis, respectively.
  • FIG. 1 is a section taken on line I-l of FIG. 4;
  • FIG. 2 is a side view illustrating the hub of the embodiment shown in FIGS. 1 and 41;
  • FIG. 3 is a view of the hub in FIG. 2, as seen in the direction of the arrow III shown in FIG. 4;
  • FIG. 4 is a side view of the embodiment of the caster in FIG. 1.
  • FIGS. 1 and 4 illustrate the complete caster whereas FIGS. 2 and 3 are views of the hub of the caster. .
  • the hub itself is completely circular in outline and is identified with reference numeral 1.
  • axle 2 Secured in it, as by casting the huh 1 around it, isan axle 2 opposite axial ends of which project beyond the opposite axial sides of the hub 1.
  • rollers 4 which are of cupped configuration as shown, their open sides facing inwardly towards the hub 1.
  • the rollers 4 are each journalled on one of the projecting end portions of the axle 2, for which purpose the rollers 4 are provided with bores or recesses accommodating journal sleeves 8 in which the end portions of the shaft 2 are received.
  • Outwardly springy circlips 3 (that is circumferentially incomplete spring-metal rings which, when radially inwardly defected, tend to resume their large-diameter original dimensions) secure the rollers 4 on the end portions of the axle 2 in known manner. Usually this is done by having corresponding grooves in the outer surface of the respective end portion and in the inner surface of the respective journalled sleeve 8, with the circlips being received in part in the respective groove.
  • the rollers 4 in the illustrated embodiment have outer circular flanges 10 the outer surface of which contact the support surface for the casters, for instance a floor.
  • the inner surfaces of these flanges 10 are slightly spaced from the outer circumferential face bounding the circular hub 1, and they extend partly in axial direction over this outer circumferential face.
  • the flanges 10 define with one another an axial circumferentially extending gap, that is they do not contact one another.
  • the hub 1 is provided with mounting means for mounting it turnably about an upright pivot axis which is laterally offset from and extends normal to the axle 2.
  • this mounting means is in form of a bore or socket 9 which can receive a downwardly projecting pin provided in the piece of furniture to which the caster is to be secured.
  • the pin might form a part of the hub itself, rather than be an extraneous component which is receivable in the socket 9.
  • the axis about which the hub 1 will thus be pivotable will be laterally spaced from the axle 2 (see FIG. 2), will have an upright orientation and will extend normal to the axle 2.
  • FIGS. 2-4 indicate particularly clearly that there is located.
  • a nose 5 bounded by a surface 6 which extends in substantial parallelism with the pivot axis passing longitudinally through the center of the socket 9, and by a second surface 7 which extends normal to this pivot axis, that is in substantial parallelism with the surface on which the caster is to be supported.
  • the two surfaces 6 and 7 include with one another an obtuse angle and each of the surfaces merges tangentially into the outer circumferential face of the hub 1.
  • the surfaces 6 and 7 include a different angle, for instance they could include a right angle with one another.
  • the axial thickness of the nose 5 is less than the axial length of the outer circumferential face, and in particular it is less than the axial width of the gap defined between the juxtaposed edges of the flanges 10 (compare FIGS. 1 and 3).
  • the flanges l0 partially overlap the outer circumferential face of the circular hub l in the illustrated manner
  • a caster for chairs and the like comprising a circular hub having an outer circumferential face; an axle extending centrally through said hub and having end portions projecting beyond opposite axial sides thereof; a pair of rollers located at said opposite axial sides of said hub and each being turnably journalled on one of said end portions; mounting means for mounting said hub turnably about an upright pivot axis which is laterally offset from and extends normal to said axle; and a nose projecting from the outer circumferential face of said hub below said mounting means and being bounded by two outer surfaces which extend from said outer circumferential face substantially parallel to and substantially normal to said axis, respectively.
  • rollers have respective outer circumferential circular flanges which slightly overlap said outer circumferential face in direction axially of said hub but are radially outwardly spaced from said circumferential face, the flanges of said rollers defining between themselves a gap extending circumferentially of said face; and wherein said nose has a thickness in axial direction of said hub and said gap which is smaller than the axial dimension of said gap.
  • said mounting means comprises an elongated socket whose central longitudinal axis coincides with

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Legs For Furniture In General (AREA)
  • Casters (AREA)
US00319768A 1972-01-03 1972-12-29 Article of manufacture Expired - Lifetime US3805320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2200062 1972-01-03

Publications (1)

Publication Number Publication Date
US3805320A true US3805320A (en) 1974-04-23

Family

ID=5832225

Family Applications (1)

Application Number Title Priority Date Filing Date
US00319768A Expired - Lifetime US3805320A (en) 1972-01-03 1972-12-29 Article of manufacture

Country Status (6)

Country Link
US (1) US3805320A (OSRAM)
JP (1) JPS4877551A (OSRAM)
BE (1) BE793143A (OSRAM)
BR (1) BR7300053D0 (OSRAM)
FR (1) FR2166366B3 (OSRAM)
IT (1) IT972878B (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894310A (en) * 1974-06-17 1975-07-15 Stafford Thomas Screen Twin-wheeled castor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0543548A3 (en) * 1991-11-19 1993-12-08 Britax Child Care Prod Vibration resistant castor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1936701A (en) * 1932-06-21 1933-11-28 Robert J Wilson Twin-wheel caster
US2423659A (en) * 1943-11-12 1947-07-08 William H Rabe Antiskid device for chairs
US2533403A (en) * 1947-10-08 1950-12-12 Nagel Chase Mfg Co Caster with grounding link
US3719370A (en) * 1971-04-02 1973-03-06 R Gintick Anti-theft shopping cart

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1936701A (en) * 1932-06-21 1933-11-28 Robert J Wilson Twin-wheel caster
US2423659A (en) * 1943-11-12 1947-07-08 William H Rabe Antiskid device for chairs
US2533403A (en) * 1947-10-08 1950-12-12 Nagel Chase Mfg Co Caster with grounding link
US3719370A (en) * 1971-04-02 1973-03-06 R Gintick Anti-theft shopping cart

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894310A (en) * 1974-06-17 1975-07-15 Stafford Thomas Screen Twin-wheeled castor

Also Published As

Publication number Publication date
FR2166366B3 (OSRAM) 1976-01-09
BE793143A (fr) 1973-04-16
JPS4877551A (OSRAM) 1973-10-18
BR7300053D0 (pt) 1973-08-21
FR2166366A1 (OSRAM) 1973-08-17
IT972878B (it) 1974-05-31

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