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A plurality of castors for a piece of furniture, each castor including a casing, two wheels, and fastener elements for fastening to the piece of furniture. The casing is made up of two units, each made as a single piece, the first unit including a portion constituted by a portion of the wheel casing

A plurality of castors for a piece of furniture, each castor including a casing, two wheels, and fastener elements for fastening to the piece of furniture. The casing is made up of two units, each made as a single piece, the first unit including a portion constituted by a portion of the wheel casing and a portion constituted by a portion of the swivel casing, the second unit including a portion constituted by another portion of the wheel casing and a portion constituted by another portion of the swivel casing. The two units are adapted to be associated with each other to form the casing in such a manner that the portions of the first unit and the portions of the second unit engage respectively one in the other, and elements are provided for securing the two units together.

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1. A castor for a piece of furniture, the castor comprising: a castor casing having a wheel casing defining a first axis for rotation of and supporting wheels, a swivel casing defining a second axis that is substantially perpendicular to the first axis and about which the castor casing can pivot, sa

1. A castor for a piece of furniture, the castor comprising: a castor casing having a wheel casing defining a first axis for rotation of and supporting wheels, a swivel casing defining a second axis that is substantially perpendicular to the first axis and about which the castor casing can pivot, said wheels mounted to rotate relative to the wheel casing via a rotary shaft on said first axis, and means for fastening the swivel casing to allow the swivel casing to pivot,wherein said castor casing comprises:first and second units, each unit being made as a single piece, said first unit comprising a first portion of the wheel casing and a second portion of the swivel casing, said second unit comprising a third portion of the wheel casing and a fourth portion of the swivel casing, the first and second units forming the castor casing such that the first and third portions engage to form the wheel casing and the second and fourth portions engage to form the swivel casing; the first portion comprises first and second substantially parallel walls defining a first space, the first and second walls being substantially perpendicular to the first axis and parallel to the second axis, each having a respective orifice centered on said first axis and having a cross section that is complementary to a cross-section of the rotary shaft;the third portion comprises third and fourth substantially parallel walls defining a second space therebetween, the third and fourth walls being substantially perpendicular to the first axis and parallel to the second axis, said third and fourth walls being arranged to be plugged into the first space, each of the third and fourth walls having a respective orifice centered on said first axis and having a cross section that is complementary to the cross-section of the rotary shaft, andmeans for securing said two units together,wherein the rotary shaft passes through the orifices of the first, second, third, and fourth walls. 2. A castor according to claim 1, wherein the second and fourth portions engage each other along said second axis via male-female engagement, the second portion including the female element and the fourth portion including the male element, further including means for securing the male and female elements together between the second and fourth portions. 3. The castor according to claim 2, wherein the means for securing the male and female elements together comprises a pin inserted into through holes respectively in the second and fourth portions, said holes being in axial alignment when the male and female elements are engaged one in the other. 4. The castor according to claim 1, wherein the means for fastening the swivel casing to the piece of furniture comprises: two holes formed respectively in the second and fourth portions, the two holes extending along said second axis; anda fastener screw comprising a screw-threaded shank and a shoulder head secured to one end of the screw-threaded shank, said screw engaging the two holes such that a free end of the screw-threaded shank emerges beyond an end of the hole formed in the second portion that is furthest from the fourth portion, and such that the shoulder head is situated in a bore formed in the fourth portion in axial alignment with the hole formed in the fourth portion, said bore opening out to an end of the hole in the fourth portion opposite from the end that is closest to the second portion, and a depth of said bore being greater than a height of said shoulder head; andsaid swivel casing is formed by assembling together the second and fourth portions. 5. The castor according to claim 4, comprising bearing means mounted to cooperate with said second portion, said bearing means being arranged such that the swivel casing can pivot freely relative to the screw-threaded shank. 6. The castor according to claim 5, further comprising a plug for closing said bore when the shoulder head is positioned therein. 7. The castor according to claim 6, further comprising means for blocking rotation of at least one of said wheels and pivoting of the castor casing. 8. The castor according to claim 7, wherein the means for blocking rotation of at least one wheel relative and pivoting of the castor casing comprises: first teeth formed on the at least one of said wheels;a first lever mounted to pivot on said first portion, one end of said first lever having second teeth complementary to the first teeth, said first lever being mounted to pivot between first and second positions such that in the first position, the second teeth engage the first teeth, and in the second position, the second teeth do not engage the first teeth;a crown ring including third teeth, said crown ring being mounted to co-operate with the second portion on a same axis as the hole formed in said second portion and including a central orifice enabling said screw-threaded shank to pass therethrough, said crown ring positioned to engage the second portion between the bearing means and the shoulder head;a bearing washer between said crown ring and the shoulder head;a second lever, one end of said second lever having fourth teeth, said second lever being mounted to pivot between first and second positions on said third portion such that in the first position, the fourth teeth engage the third teeth, and in the second position, the fourth teeth do not engage the third teeth;means for causing both levers to pivot between their respective second and first positions; andcontrollable return means for returning both levers from their first positions towards their second positions. 9. The castor according to claim 8, wherein the means for causing the first and second levers to pivot between their respective second and first positions comprise: a cam mounted to pivot about the rotary shaft, said cam being disposed in the second space; andmeans for causing said cam to pivot so the first and second levers pivot between their respective second and first positions. 10. The castor according to claim 5, further comprising a sealing cap comprising a cover suitable for covering the top of the second portion, a projecting portion on the cover, and a central orifice passing through the cover and the projecting portion, said central orifice presenting a cross section that is substantially equal to the cross-section of the screw-threaded shank. 11. The castor according to claim 5, wherein said bearing means comprise a cage having outer and inner cages, said outer cage being secured to the second portion and the inner cage having the screw-threaded shank passing therethrough, said cap comprising: a cover suitable for covering the top of the second portion;a projecting portion on the cover; anda central orifice passing through the cover and the projecting portion, said central orifice being of section that is substantially equal to the cross-section of the screw-threaded shank, and said projecting portion suitable for being engaged as a force-fit between the screw-threaded shank and the inner cage of the bearing. 12. The castor according to claim 11, wherein at least one of the cap, the second portion, the third portion, and at least one of the wheels is made of a plastics material filled with an electrically conductive filler. 13. The castor according to claim 12, wherein said cage and the rotary shaft are made of an electrically conductive metal material, the cap, the third portion, and at least one of the wheels being made of a plastics material filled with metal fibers, and a connection piece of electrically conductive material contacts and electrically connects said cage and said third portion. 14. The castor according to claim 13, wherein said connection piece includes a ring mounted in contact with said cage, between said cage and said crown ring, and at least first and second tabs secured to said ring on either side thereof so that the first tab contacts the cage and the second tab contacts the third casing portion. 15. The castor according to claim 1, wherein the second and fourth portions engage each other along said second axis via male-female engagement, the second portion including the female element of said male-female engagement and the fourth portion including the male element. 16. The castor according to claim 2, wherein the means for fastening the swivel casing to the piece of furniture include: two holes formed respectively in the second and fourth portions, the two holes extending along said second axis;a fastener screw comprising a screw-threaded shank and a shoulder head secured to one end of the screw-threaded shank, said screw engaging in the two holes such that a free end of the screw-threaded shank emerges beyond an end of the hole formed in the second portion that is furthest from the fourth portion, and that the shoulder head is situated in a bore formed in the fourth portion in axial alignment with the hole formed in the fourth portion, said bore opening out to an end of the hole in the fourth portion opposite from the end that is closest to the second portion, and a depth of said bore being greater than a height of said shoulder head; andsaid swivel casing formed by assembling together the second and fourth portions. 17. The castor according to claim 4, further comprising a sealing cap having a cover suitable for covering the top of the second portion, a projecting portion on the cover, and a central orifice passing through the cover and the projecting portion, said central orifice having a cross section that is substantially equal to a cross-section of the screw-threaded shank.