Patent ID: 6618999
Filing Date: 2003-09-16
Classification: E21B

Abstract:
A safety apparatus for a derrick having a crown and at least one traveling block, comprising:a. at least two support beams attached to the crown of a lifting structure; b. a plate secured between said support beams; c. a dual compound bumper pad for shock absorption and impact resistance consisting of a high quality natural rubber and a member of the group consisting of a high quality butyl, a halogenated butyl elastomer, and combinations thereof, secured to said plate overlaying the edges of the plate and adapted to be positioned at the crown of the derrick to cushion any impact between the traveling block and the crown and to eliminate the possibility to cutting any ropes used by the traveling block, if the traveling block is lifted towards the crown without stopping; d. wherein said bumper pad is secured to said plate with fasteners and the bumper pad has a length of between 8 inches and 48 inches and a width of between 10 inches and 48 inches, and a height between 6 and 24 inches; and e. wherein the plate is at least 1 inch thick and said plate and said support beams comprise a material selected from the group consisting of steel, coated steel, heat treated steel, and combinations thereof.