Quick-change insert for tools, especially for thread drills

A quick-change insert for tools for minimal lubrication, that is designed for detachable mounting in a chuck (30) provided with a central lubricant channel (32) and for introducing the lubricant as an aerosol from the lubricant channel (32) into the rear end of a longitudinal bore (14) of an inserted tool (11),

• wherein a sealing body (40) is provided having a sleeve (42) and a central passage (41), wherein said sealing body (40) is located in a rear receptacle (25) of the insert body (17) such that, when the tool (11) is inserted and installed in the chuck (30), said sleeve (42) with an end (43) assigned to the rear end (13) of the tool (11), is capable of being brought into contact with the tool (11) and connects the lubricant channel (32) and the longitudinal bore (14) of the tool (11) with each other in an at least substantially leakproof manner, wherein the sealing body (40) is axially displaceably guided in the receptacle (25), and wherein the sealing body (40) is capable of being pressed in a resilient manner against the shank end of the tool (11) by means of at least one spring (48) that bears with one end indirectly against the insert body (17) and, with its other end, acts on the sealing body (40) in the direction of the shank end of the tool (11), wherein the sleeve (42) includes a radially projecting annular part (45) that performs a centering function inside the receptacle (25) of the insert body (17),
• wherein the one sleeve end (43) includes a nearly truncated cone-shaped outer surface (44) and is capable of being moved into a corresponding reverse nearly truncated cone-shaped expansion (24) of the rear end of the longitudinal bore (14) of the tool (11),
• wherein said sleeve (42), when installed in the chuck (30), is capable of being penetrated by a chuck-side tube part (33) of the lubricant channel (32) in a longitudinal section of its passage (41),
• wherein a guide part (46) is retained in the receptacle (25) of the insert body (17), by way of which the sleeve (42) is guided in an axially displaceable manner,
• wherein the guide part (46) includes a guide sleeve (47) centered radially in the receptacle (25) of the insert body (17), the guide sleeve being positioned on the sleeve (42) and is penetrated by it, and
• wherein the at least one spring (48) is axially supported on the guide part (46), which is axially supported via a retaining means (49) on the insert body (17).