US2401490A - Keyseating tool - Google Patents

Description

June 4, 1946. G. H. LITTLE 7 KEY SEATING TOOL Filed Aug. 21, 1944 l/ I/Al INVEN TOR. GORDON H; LITTLE ATTORNEY Patented June 4, 1946 2,401,490 uni SEATING TQOL Gordon 11. Little; Middle River, Ma, ammo: to The Glen L. Martin Company, Middle River,

Maryland Application August 21, 1944 Serial No. 550,359

Md., a. corporation of My invention relates to an improved form of seating tool for rivets, and more particularly for rivets of the type having a key at the juncture of the head and shank to prevent rotation of the rivet in use. i

There is a wide current use of rivets provided with such a key to prevent rotation, such as that shown in the United States Letters Patent No. 2,188,422 to Waner. o accommodate, or seat. such a key it is necessary to prepare a corresponding notch in the metal adjacent the rivet hole.

The method currently employed in providing the key seat is 'broaching a groove in the wall of the rivet hole or bore. It is a characteristic of the breaching operation that it extends for the full length of the bore. This operation is time consuming, expensive, and in large part useless since the key extends but a slight distance along the length of. the rivet shank.

It is among the objects of my invention to provide a means for forming a key seat for a rivet of the character described in which the key seat extends for less than the axial length of the bore provided for the rivet.

It is a further object of my invention to provide a means for key seating a; rivet oi the character describedin which a seat is drilled eccentricallyof the rivet bore axis.

A iurtherobject of my invention is to provide for the key seating of rivets of the character" described by drilling on an axis parallel to but spaced from the bore axis.

It is another object of my invention to provide a means for key seating rivets of the character described wherein a drill guide extendsalong the periphery of a pilot member and aligns the-drill to cut a cylindrical grove in the bore.

Qther and further objects will become apparent from the following description and from the attached drawing, wherein:

Figure l is an exploded View or my key seating tool;

a is a perspective view of a portion of my tool;

Fig. 3 shows the pilot and drill of my tool inserted into a rivet bore;

end portion 8 terminating in a clamp ii and a mm. (01. 71-'55)' Y nally threaded bore ll and-slidably' mounted within the bore la of the holder The clamp 9 is adapted to flt over a conventional electric drill motor housing I! and to be secured to the housing, by a nut l3 and bolt ll.

A drill chuck I5 is mounted on a shaft l6 rotatably carried by a conventional drill motor within the housing l2 and is adapted to receive and hold the shaft ll of a drill l8.

A tool body is is formed with an oil center boss extending from one end, the boss being threaded to engage the threaded bore ll of the holder I. The sides of the tool body are flattened at 2| to permit clamping as by a wrench to secure the body tightly to the holder. A drill supporting pilot 22 having a diameter corresponding to that smaller end portion it provided with an interes of the rivet hole to be worked extends centrally from the other end of the tool body it. This drill supporting pilot performs a number of functions. It guides the drill to the proper position so that the key seat will be cut on the periphery of the bore; it extends about theend of the drill to act as a. support to prevent defiection'or breakage of the drill; and it provides a guide for the end of the drill; all as will presently be described.

A drill bore 23 adapted to receive the drill i8 is formed through the tool body 69, extending throughthe boss 28, through the body, and along the periphery of the drill supporting pilot 22 to a point adjacent thetip of the pilot. When the tool body is is assembled with the holder l the drill it extends partially through the tool body (He. 5). I

The operation of my key seating tool is as follows: I

The tool is placed over the bore to be key seated to receive and secure the rivet. As the drill supporting pilot 22 is inserted in the rivet bore the rotating drill i8 is positioned directly above the periphery of the bore. As pressure is applied to the holder it moves past the holder end it, and the moves axially of the rivet bore and pilot. The then cuts out the key seat. The seat may made slightly deeper than the key of the rivet to be rivet but need not be the full length of the rivet bore. the drilling operation the pilot 22 provides lateral support for the drill, thereby preventing its bending or breaking.

Thus according to my invention, an unskilled worker is led to quickly prepare a seat which i; to insure a tight fit for the 3 I claim: A tool for forming a key seat in a bore comprising, in combination. means for mounting said tool on a drill motor housing, a motor driven drill chuck carried within said means, a rotary drill carried by said drill chuck, a tool body having a pilot fixed to said means, said pilot having a diameter corresponding to that o! the bore, and

- the end of the drill and guide means to limit the movement of the drill in the guide means and protect and support the end of the drill.

- GORDON H. LITTLE.

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