. Catalogue of dental materials, furniture, instruments, etc., for sale . .The peculiar construction of this working arm, sheath, and shaft is such that besideshaving free horizontal motion by the pivoted head-piece (L), it is flexible at nearly everyportion of its length, 26 inches^ while in all other engines the flexibility is limited to afew inches of spiral spring between a stiff rod and the hand-piece. 80 S. S. WHITES THE HAND-PIECE AND TOOL combine several novel and effective devices, as shown (full size) in Cut No. 3. The toolor bit (A), at the end of its shank, is reduced to a wedge-sh
. Catalogue of dental materials, furniture, instruments, etc., for sale . .The peculiar construction of this working arm, sheath, and shaft is such that besideshaving free horizontal motion by the pivoted head-piece (L), it is flexible at nearly everyportion of its length, 26 inches^ while in all other engines the flexibility is limited to afew inches of spiral spring between a stiff rod and the hand-piece. 80 S. S. WHITES THE HAND-PIECE AND TOOL combine several novel and effective devices, as shown (full size) in Cut No. 3. The toolor bit (A), at the end of its shank, is reduced to a wedge-shape on one side to the extentof one-fourth of an inch from the end, terminating in a lateral groove embracing one-thirdthe circumference of the shank. The tool-holder or chuck has a pin (B) inserted tan-gentially across the bore at the proper distance to interlock with the lateral groove ofthe tool; beneath the pin a wedge (C), corresponding to the wedged end of the bit, isheld in position by a spiral spring (D) ; this wedge is fastened through a slot in the Cut No. chuck to a cylindrical grooved collar or ring (E) working longitudinally upon the outer case of the hand-piece has an oval aperture (F) exposing the grooved collar,which may thus be worked by the thumb-nail. Tn order to secure the tool in the holder,it is only necessary to insert the shank, turn it until its wedge-face clears the pin, and pushit into the socket; this pressure also forces down the wedge and spring inside; then aslight turn of the tool locks its lateral groove on the pin and removes the pressure fromthe wedge, which is then forced up by the spring and secures the tool in its place (G-),so that it cannot possibly pull out when in use, or fly out when run without being-pressed upon. To remove the tool, simply push back the grooved collar, and reverse the turn bywhich the bit was locked on the pin. In this hand-piece the tool is not dependent upon the external case for its bearing,as in o
Size: 2389px × 1046px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidcatalogueofd, bookyear1876
