초록

A self-deploying net, wherein depression of a locking mechanism springfully urges a net from out a compact, portable housing, thus minimizing overall deployment time, eliminating lengthy net assembly processes and enabling single handed net deployment.

대표청구항 ▼

A self-deploying net, wherein depression of a locking mechanism springfully urges a net from out a compact, portable housing, thus minimizing overall deployment time, eliminating lengthy net assembly processes and enabling single handed net deployment. another, wherein prior to the insertion of th

A self-deploying net, wherein depression of a locking mechanism springfully urges a net from out a compact, portable housing, thus minimizing overall deployment time, eliminating lengthy net assembly processes and enabling single handed net deployment. another, wherein prior to the insertion of the scraper in the tube, first distances, from the axis of rotation to each scraping surface, are greater than the radius of the internal diameter of the tube to be scraped, second distances from the axis of rotation to a surface diametrically opposite to each scraping surface, are less than the tube radius and the sum of the first distance and the second distance at each scraping surface is less than the internal tube diameter such that the shank portions are required to bend to enable the scraper,to be admitted to the tube internal diameter, and wherein the scraping surfaces are connected by connecting rods which are screwed together with a scraping body mounted at each screwed junction. 2. The scraper of claim 1, wherein the scraping bodies are eccentric cylindrical bodies with internal splines and the connecting rods have external splines on which the bodies are mounted against rotation. 3. The scraper of claim 2, wherein each screwed junction includes a mounting surface for a scraping body, part of the mounting surface having an external spline around its circumference and part being smooth around its whole circumference, and each scraping body has a central bore, one end of which has internal splines and the other end of which is smooth, and the scraping body can be mounted on the junction in any angular orientation and held in that orientation by engagement between the splines. 4. The scraper of claim 3, wherein the splined part of the mounting surface at the junction between two connecting rods is formed on one of the rods and the smooth part is formed on the other rod. 5. A combination comprising: a tube of a predetermined internal diameter; and a casing scraper for cleaning the inner surface of said tube, the scraper comprising: an axis of rotation, a plurality of axially spaced, rigidly connected scraping surfaces with each surface having an angular extent of less than 180° and being angularly offset from other surfaces, and shank portions rigidly connecting the scraping surfaces to one another, wherein prior to the insertion of the scraper in the tube, first distances, from the axis of rotation to each scraping surface, are greater than the radius of the internal diameter of the tube to be scraped, second distances from the axis of rotation to a surface diametrically opposite to each scraping surface, are less than the tube radius and the sum of the first distance and the second distance at each scraping surface is less than the internal tube diameter such that the shank portions are required to bend to enable the scraper to be admitted to the tube internal diameter. 6. A casing scraper configured for cleaning the inner surface of a tube of a given internal diameter, the scraper comprising: a plurality of scraping bodies rigidly connected together by a plurality of shank portions between adjacent scraping bodies, the scraping bodies being axially spaced and with the shank portions define an axis of rotation, the shank portions being longer than the scraping bodies; each of the scraping bodies defining an arcuate scraping surface extending transverse with respect to the axis having an angular extent of less than 180 degrees, the scraping surfaces of each of the scraping bodies being rigidly fixed with respect to the remainder of the scraping body and also angularly offset from the other scraping bodies; and, the scraping surface of each of the scraping bodies being spaced a first distance from the axis of rotation selected to be greater than the radius of the given internal diameter of the tube to be scraped and each scraping body including a surface diametrically opposite the respective scraping surface that is spaced a second distance from the axis of rotation with the first distance being greater than the second distance and the sum of the first and second distances of each respective scraping body is less than the given internal diameter of the tu be to be cleaned such that the shank portions are required to bend to enable the scraper to be admitted to the given tube internal diameter. 7. The scraper of claim 6, wherein the scraping surfaces are axially spaced by connecting shanks which are integral with the scraping surfaces. 8. The scraper of claim 6, wherein the scraping surfaces have surface grooves in the form of a partial helical screw thread. 9. The scraper of claim 6, wherein the scraping surfaces, considered together have an angular extent of 360°. 10. The scraper of claim 6, wherein the first distance is 1.005 to 1.010 times the second distance. 11. The scraper of claim 6, wherein the angular extent of each scraping surface is between 75 and 125° of arc. 12. The scraper of claim 6, wherein the scraping surfaces are connected by connecting rods which are screwed together with a scraping body mounted at each screwed junction. 13. The scraper of claim 12, wherein the scraping bodies are eccentric cylindrical bodies with internal splines and the connecting rods have external splines on which the bodies are mounted against rotation. 14. The scraper of claim 13, wherein each screwed junction includes a mounting surface for a scraping body, part of the mounting surface having an external spline around its circumference and part being smooth around its whole circumference, and each scraping body has a central bore, one end of which has internal splines and the other end of which is smooth, and the scraping body can be mounted on the junction in any angular orientation and held in that orientation by engagement between the splines. 15. The scraper of claim 14, wherein the splined part of the mounting surface at the junction between two connecting rods is formed on one of the rods and the smooth part is formed on the other rod. 16. The scraper of claim 6, wherein said scraping bodies comprise eccentric lobes. 17. A casing scraper configured for cleaning the inner surface of a tube of a given internal diameter, the scraper comprising: an axis of rotation, a plurality of axially spaced, rigidly connected scraping surfaces disposed at predetermined first distances from the axis of rotation, each of said predetermined first distances being selected to be greater than the radius of the given internal diameter of the tube to be scraped, shank portions rigidly connecting the scraping surfaces to one another, and a surface diametrically opposite to each of said plurality of scraping surfaces that is disposed at a predetermined second distance from the axis of rotation, said predetermined second distance being selected to be less than the radius of the given internal diameter of the tube to be scraped so that the sum of the first distance and the second distance at each scraping surface is less than the internal tube diameter such that the shank portions are required to bend to enable the scraper to be admitted to the given tube internal diameter, wherein each scraping surface is configured to have an angular extent of less than 180° and to be angularly offset from other scraping surfaces; and wherein the scraping surfaces have surface grooves in the form of a partial helical screw thread. 18. A casing scraper configured for cleaning the inner surface of a tube of a given internal diameter, the scraper comprising: an axis of rotation, a plurality of axially spaced, rigidly connected scraping surfaces disposed at predetermined first distances from the axis of rotation, each of said predetermined first distances being selected to be greater than the radius of the given internal diameter of the tube to be scraped, shank portions rigidly connecting the scraping surfaces to one another, and a surface diametrically opposite to each of said plurality of scraping surfaces that is disposed at a predetermined second distance from the axis of rotation, said predetermined second distance being selected to be less than the radius of the given internal diameter of the tub