Caster with a stopper

Claim 2

A caster comprising a basic body turnable at one end thereof and provided at its opposite end with spaced apart axle supports for receiving an axle on which wheels are rotatably mounted on the opposite sides of said axle supports thereby to position the wheels in a direction transverse to the moving direction thereof, a stopper comprising a bearing portion at one end of the stopper and mounted on the axle between the axle supports, at least a part of said bearing portion being formed of a strengthening steel material; an oblique grounding surface provided on said stopper at an end opposite to said bearing portion, said grounding surface being flat for substantial surface contact with the earth on pivotal movement of the bearing portion about the axle, an engaging part forming an extension of the grounding surface for setting the stopper above the lower margin of the wheels; a spring received in a recess in the basic body and being compressed within said recess by the stopper when the stopper is set above the lower margin of the wheels and urging the stopper downward on releasing the engaging part; and a swing limiting means adjacent to the bearing portion for limiting the range of the swinging movement of the stopper about said axle.

Claim 3

The caster as claimed in claim 1, wherein the engaging part is provided at its free end with a gripping piece for operating the stopper.

Claim 4

A caster as claimed in claim 1, wherein the stopper is provided with a projection for engaging with the spring between the bearing portion and the engaging part.

Claim 5

A caster as claimed in claim 2, wherein the stopper is provided with a projection for engaging with the spring between the bearing portion and the engaging portion.

Claim 6

A caster as claimed in claim 1, wherein the swing limiting means is engageable with the basic body upon contact of the grounding surface with the earth thereby to raise the wheels slightly above the earth.

Claim 7

A caster as claimed in claim 2, wherein the swing limiting means is engageable with the basic body upon contact of the grounding surface with the earth thereby to raise the wheels slightly above the earth.

Claim 8

A caster as claimed in claim 3, wherein the swing limiting means is engageable with the basic body upon contact of the grounding surface with the earth thereby to raise the wheels slightly above the earth.

Claim 9

A caster as claimed in claim 1, wherein cooperative means are provided one on the basic body and the other on the engaging part and comprising a projection and an aperture, said projection being received in the aperture for locking the stopper in its set position above the lower margin of the wheels.

Claim 10

A caster comprising a basic body part turnable at one end thereof and provided at its opposite end with spaced apart axle supports for receiving an axle on which wheels are rotatably mounted on the opposite sides of said axle supports thereby to position the wheels in a direction transverse to the moving direction thereof, a stopper part comprising a bearing portion at one end of the stopper part and mounted on the axle between the axle supports for pivotal movement relative to said basic body part, one of said body and stopper parts having a recess therein and the other part a projection therefrom, at least a part of said bearing portion being formed of a strengthening steel material; an oblique grounding surface provided on said stopper part at an end opposite to said bearing portion, said grounding surface being flat for substantial surface contact with the earth on downward pivotal movement of the bearing portion about the axle, an engaging means forming an extension of the grounding surface for setting the stopper part above the lower margin of the wheels on upward pivotal movement of the bearing portion about the axle; a spring accommodated at an end portion thereof in said recess and its other end by said projection for compressing the spring within the recess when the stopper part is set above the lower margin of the wheels and for urging the stopper part downward and releasing the engaging means; and a swing limiting means adjacent to the bearing portion for limiting the range of the pivotal movement of the stopper part about said axle.

Claim 11

A caster comprising a basic body part turnable at one end thereof and provided at its opposite end with spaced apart axle supports for receiving an axle on which wheels are rotatably mounted on the opposite sides of said axle supports thereby to position the wheels in a direction transverse to the moving direction thereof, a stopper part comprising a bearing portion at one end of the stopper part and mounted on the axle between the axle supports for pivotal movement relative to said basic body part, one of said body and stopper parts having a recess therein and the other part a projection therefrom, at least a part of said bearing portion being formed of a strengthening steel material; an oblique grounding surface provided on said stopper part at an end opposite to said bearing portion, said grounding surface being flat for substantial surface contact with the earth on downward pivotal movement of the bearing portion about the axle, an engaging means forming an extension of the grounding surface for setting the stopper part above the lower margin of the wheels on upward pivotal movement of the bearing portion about the axle; a spring accommodated at an end portion thereof in said recess and its other end by said projection for compressing the spring within the recess when the stopper part is set above the lower margin of the wheels and for urging the stopper part downward and releasing the engaging means; and a swing limiting means adjacent to the bearing portion for limiting the range of the pivotal movement of the stopper part about said axle.