Adjustable horizontal hole drilling apparatus

Claim 1

An adjustable horizontal hole drilling apparatus for simultaneous drilling of a plurality of holes through vertically disposed workpiece areas, comprising: A. reciprocably movable horizontally opposed drill bit mounting heads, including in said heads: i. a fixed sleeve bearing; ii. a fixed spindle in said bearing rotatably disposed therein; iii. a floating spindle slidably mounted in said fixed spindle operatively fixed with respect thereto; and iv. drive means for rotating said fixed spindle and therethrough said floating spindle; B. chucks attached to said floating spindles; C. vertically spaced drill bits operatively mounted in horizontal drilling positions in said chucks on said floating spindles; D. means for horizontally extending and retracting said drill bits on each said head into and out of operative drilling engagement with a workpiece being drilled; E. said drive means including: i. a compression spring interposed between said fixed spindle and said floating spindle; ii. said fixed spindle having a slot therein; and iii. a power transmission pin interengaging said floating spindle and said slot for continuous power transmission when said floating spindle is extended or retracted with respect to said fixed spindle; F. means for positionally vertically adjusting said drill bits on the respective ones of said heads conjointly and severally to vertically adjusted drilling positions with respect to a workpiece to be drilled and to adjusted spaced drilling positions with respect to one another and to a said workpiece; and G. a locking block mounted for extension and retraction into operative engagement with said chucks to selectively lock said drill bits in extended drilling position and permit retraction therefrom.