Device for connecting the bits with the cutting head of a drift advancing machine or the like
AssigneeVereinigte Osterreichische Eisen-und Stahlwerke
InventorSiegfried Sigott
Life of this patent
Estimating the term…
Abstract
A drift advancing machine or the like having a cutting head with replaceable bits. Each bit is disposed in a sleeve-shaped bit holder fixed to the cutting head. Arranged at an oblique angle to the axis of each bit is a pivotal locking bolt having a first pivotal position wherein it engages a recessed portion of the bit and prevents removal of the bit, and a second pivotal position wherein it is out of engagement with the recessed portion of the bit and allows removal of the bit. The front end of the locking bolt is shaped particularly for engagement with the bit recessed portion.
Claims9
A device for connecting a bit to a cutting head, comprising:
- a sleeve-shaped bit holder fixed to the head and accommodating a bit, said sleeve-shaped bit holder having a cavity disposed along an axis,
- a locking bolt disposed within a mounting obliquely arranged to the axis of said sleeve-shaped bit holder, said locking bolt being pivotally supported and having a recess on one side of a front end thereof protruding into the cavity of the bit holder, said locking bolt fron end extending in a locking pivotal position thereof into a recess formed in the bit,
- said locking bolt also having a recessed portion defining with a front surface said front end of said locking bolt, said bit recess and said front end of said locking bolt being sized, so that when said locking bolt is moved into a releasing pivotal position, said front end of said locking bolt does not extend into said bit recess, and removal of the bit is possible, and
- said recessed portion of said locking bolt being defined by an inclined plane extending from said fron surface of said locking bolt, and inclined plane including with the locking bolt axis an angle that is at least of the same magnitude as the angle at which the locking bolt and mounting therefor are inclined relative to the sleeve-shaped bit holder axis.
Dependencies are inferred from the claim text.