3]
Patented by Nathan Hunt, Sept. 17, 1867. For further information address
the patentee, or Sharps, Davis & Bonsall, Salem, Ohio, who will furnish
piston heads to order on receipt of size of cylinder and piston rod.
* * * * *
Improvement in Hand Drills.
There are frequent occasions in a machine shop where light drilling is
required on work it is inconvenient to bring to the lathe. For this the
Scotch or ratchet drill, if the job is heavy, is employed, and if
light, the breast drill. The placing and working of the former consumes
considerable time, and the labor of drilling with the breast drill is
excessive and exhausting. It is difficult also to hold the instrument so
steady as not to cramp and break the drill. The combination of the drill
with tongs and a pivoted bed piece, as seen in the engraving, obviates
these objections.
[Illustration: NEVERGOLD & STACKHOUSE'S TONGS DRILL.]
To the lower jaw, A, of a pair of tongs is pivoted a platen or bed, B,
having a hole through its center, which is continued through the jaw for
the passage of the drillings.
Pages:
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174