US 6,203,253 B1Granted

Rivet drill-out guide

OwnerJamie A. Perraultinventor

Life of this patent

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Abstract

A tool for use with a power drill for removal of rivets in light alloy panels and other structures. A hollow, cylindrical drill cage is mountable to the bottom of a tool body having a reciprocating drive shaft. A drill bit which is mounted on the lower end of the drive shaft extends downwardly through the cage and passes through a guide bushing at the lower end thereof. The guide bushing has an axial bore for receiving and guiding the drill bit, a central socket for receiving and holding the head of the rivet, and a broad annular surface which extends around the socket so as to engage the surrounding material and stabilize the tool and bit perpendicular thereto. The drill cage has port openings formed in the sides thereof for discharge of shavings which are pulled upwardly by operation of the bit, and a channel is also formed across the annular stabilizing surface for discharge of chips and shavings therethrough. The penetration depth of the drill is adjustable by rotating the drill cage on the threaded tool body, and a plurality of teeth on the upper edge of the drill cage selectively engage corresponding teeth on a locking ring on the body so as to lock the cage in position and prevent unintended rotation. The reciprocating drive shaft may be yieldingly biased towards the upper, retracted position. The body of the tool may be formed by a modified body an adjustable depth counter-sink tool.

Claims13

Dependent claims

An attachment for removing a rivet from a bore in a panel, said attachment being mountable to a modified body of an adjustable countersink tool having a vertically reciprocating drive shaft and comprising:

a generally cylindrical, hollow drill cage having an upper end for threadingly engaging an exterior of said modified body so that a vertical position of said drill cage is selectively adjustable by rotating said drill cage on said body, and a lower end having a narrow annular lip;
a drill bit which is mountable to a lower end of said drive shaft so that said bit extends downwardly through said hollow interior of said drill cage, said drill bit having a diameter equal to or just slightly smaller than that of a shaft of said rivet;
and
a guide bushing which is mountable to a lower end of said drill cage, said guide bushing comprising:
an annular flange portion having an outer edge which does not project outwardly substantially beyond said annular lip on said lower end of said drill cage, said flange portion having a broad, flat, base surface that extends inwardly from said outer edge of said flange portion for resting in stabilizing engagement against a surface of material surrounding said rivet;
an axial guide bore having a diameter that closely matches said diameter of said drill bit, so that said guide bore maintains axial alignment of said drill bit with said shaft of said rivet and ensures that said bit is confined within said bore in said panel as said bit passes therethrough;
and
a socket formed centrally in said base surface for receiving a head of said rivet therein and maintaining said shaft of said rivet in coaxial alignment with said axial bore and said drill bit which is guided therethrough.

5 more elements

A guide bushing for removing a rivet from a bore in a panel, said guide bushing being detachably mountable to a hollow, cylindrical drill cage mounted on a body of a countersink tool and comprising:

an annular flange portion having an outer edge which does not project outwardly substantially beyond a narrow annular lip on a lower end of said drill cage, said flange portion having a broad, flat base surface that extends inwardly from said outer edge of said flange portion for resting in stabilizing engagement against a surface of material surrounding said rivet;
a guide bore formed axially through said bushing, said bore having a diameter that closely matches said diameter of a drill bit mounted on said countersink tool so that said guide bore maintains axial alignment of said drill bit with a shaft of said rivet and ensures that said bit is confined within said bore in said panel as said bit passes therethrough;
and
a socket formed centrally in said base surface for receiving a head of said rivet therein and maintaining said shaft of said rivet in coaxial alignment with said axial bore and said drill bit which is guided therethrough.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/447,169Filed 22 Nov 1999 · us provisional application
Priority: 24 Nov 1998
Granted: 20 Mar 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B23B 47/284
Drill jigs for workpieces: jigs for drilling rivets or bolts
B21J 15/50
Accessories for use in connection with riveting, e.g. pliers for upsetting; Hand tools for riveting: removing or cutting devices for rivets
B23B 2215/04
Details of workpieces: aircraft components
Y10T 408/559
With work-engaging structure other than Tool or tool-support: funnel like work-engaging surface cooperating with protuberance on work