US5219174A — Drill chuck for a drill to be used particularly f…

Claim 1

Independent Claim 116 words

A quick-change drill chuck for use with surgical drilling machines, said entire chuck being made of material permeable to x-radiation and comprising drill bit retainer means having a central axis, a gripper sleeve surrounding said retainer means and adapted to slide over said retainer means in the axial direction and a locking pin positioned in the retaining means to slide transversely from a position in which it secures a drill bit in the retaining means to a position in which it permits a drill bit seated in said retainer means to be removed from the retainer means, said pin being moved from one of said positions to the other by sliding movement of the gripper sleeve.

Claim 2

Dependent Claim 116 words

A quick-change drill chuck for use with surgical drilling machines, said entire chuck being made of material permeable to x-radiation and comprising drill bit retainer means having a central axis, a gripper sleeve surrounding said retainer means and adapted to slide over said retainer means in the axial direction and a locking pin positioned in the retaining means to slide transversely from a position in which it secures a drill bit in the retaining means to a position in which it permits a drill bit seated in said retainer means to be removed from the retainer means, said pin being moved from one of said positions to the other by sliding movement of the gripper sleeve.

Claim 3

Dependent Claim 45 words

The drill chuck claimed in claim 1 wherein the retainer means has a coupling shaft, rotatively seated therein, said shaft having a recess for receiving a drill bit at one end and gear means at its other end for attachment to said rotational drive means.

Claim 4

Dependent Claim 84 words

The drilling device claimed in claim 1 wherein said angle attachment has a housing and a drive shaft connected at one end to said drive means and at the other to a bevel gear and said drill chuck has drill bit retainer means comprising a coupling shaft having a recess for receiving a drill bit and a bevel gear engaging the bevel gear in said angle attachment at a 90° angle, said retainer means being detachably connected to the housing of said angle attachment.

Claim 5

Dependent Claim 54 words

The drilling device claimed in claim 3 wherein said chuck has a gripper sleeve surrounding said retainer means and adapted to slide over said retainer means in the axial direction and a looking pin positioned in the retaining means, and operable by said gripper sleeve to retain a drill bit in said retainer means.

Claim 6

Dependent Claim 49 words

The drill chuck claimed in claim 1, wherein the retainer means has drive side and drill side stops limiting the sliding movement of the gripper sleeve, and said gripper sleeve has a guide track to receive the locking pin when the gripper sleeve is in its drill side position.

Claim 7

Dependent Claim 76 words

The drill chuck claimed in claim 1 wherein the retaining means has drive side and drill side position stops, limiting the sliding movement of the gripper sleeve, wherein said chuck comprises three locking pins separated by 120° from one another, each of said pins having a rounded tip and a hemispherical head, said gripper sleeve having a guide track to receive the heads of said pins when said gripper sleeve is in the drive side position.

Claim 8

Dependent Claim 106 words

A drilling device for use in surgery comprising drive means, a drill bit and a quick-change chuck connected to said drive means for rotation by said drive means, said chuck having retainer means, a coupling shaft rotationally seated in said retainer means and having a recess for receiving a drill bit having a shaft and a gripper sleeve surrounding said retaining means, said retaining means having a plurality of pins, said gripper sleeve being slidable on said retainer means to move said pins into engagement with said drill shaft to retain said drill shaft and drill bit in said recess for rotation with said coupling shaft.

Claim 9

Dependent Claim 106 words

A drilling device for use in surgery comprising drive means, a drill bit and a quick-change chuck connected to said drive means for rotation by said drive means, said chuck having retainer means, a coupling shaft rotationally seated in said retainer means and having a recess for receiving a drill bit having a shaft and a gripper sleeve surrounding said retaining means, said retaining means having a plurality of pins, said gripper sleeve being slidable on said retainer means to move said pins into engagement with said drill shaft to retain said drill shaft and drill bit in said recess for rotation with said coupling shaft.

Claim 10

Dependent Claim 28 words

The drilling device claimed in claim 7 wherein said drill bit shaft has an annular groove to receive a pin for retaining said drill bit in said recess.

Claim 11

Dependent Claim 92 words

The drilling device claimed in claim 8 wherein there are three locking pins, said pins having rounded tips and hemispherical heads, said gripper sleeve having an annular groove for receiving the heads of said pins when said pins are not in engagement with said drill bit shaft, and the annular groove of said drill bit shaft having an oblique surface, contact of the locking pins with said surface pressing the drill shaft against the rear surface of the recess of said coupling shaft, thereby to limit axial movement of the drill bit.

Claim 12

Dependent Claim 29 words

The drilling device claimed in claim 7 wherein the drill bit is not permeable to x-radiation and is fixed in the drill bit shaft which is permeable to x-radiation.

Claim 13

Dependent Claim 23 words

The drilling device claimed in claim 7 wherein the drill bit shaft is retained in the recess on the coupling shaft by friction.

Claim 14

Dependent Claim 26 words

The drilling device claimed in claim 1 wherein the material permeable to x-radiation is selected from the group consisting of polyetheretherketones, polyamidimides, polyoxymethylenes and combinations thereof.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-06-14	1996-12-14	1997-06-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-06-14	2000-12-14	2001-06-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-06-14	2004-12-14	2005-06-15	$7700.00	Window Closed / Lapsed

Drill chuck for a drill to be used particularly for surgical purposes

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