![]() The headed end of the mandrel remains in the rivet or may fall out, but takes no part in the function of the rivet as a fastener. The strength of the mandrel is such that tremendous forces are developed in forming the rivets and, eventually, the mandrel breaks. ![]() The head of the mandrel or nail causes a flange to be formed on the free end of the tube and this flange is pressed tightly against the other side of the assemblage to form a rivet. It is possible to join two sheet metal articles by passing the tubular portion of the rivet through matching holes in the metal objects and, while holding the flange tightly against one side of the assemblage, pulling the mandrel. A headed mandrel (similar to a common nail) extends through the tube with its head at the end of the tube opposite the flanged end. This is a rivet which is tubular in nature and consists of a short tube having a radial flange at one end. In the art of riveting, it has become common practice to make use of the so-called "blind rivet". A rivet gun as recited in claim 1, wherein the secondary piston system includes a power bore extending longitudinally of the barrel and having a piston with a piston rod extending to the end of the barrel and connected to the rivet anvil, the anvil having a bore that is parallel to and spaced from the power bore. A rivet gun as recited in claim 11, wherein the squeeze lever is provided with a protuberance on the side facing the hand grip, the protuberance having a pivot point which moves parallel to the axis of the pump bore when the squeeze lever is moved toward the handle grip, wherein one end of a first link is pivotally connected to the squeeze lever at the said pivot point, wherein one end of a second link is pivotally connected to the handle grip, the other ends of the links being pivotally connected, the first link being formed with an integral bellcrank arm that extends beyond the pivotal connection of the links and engages a pump piston of the first piston system, and wherein a coil spring concentric with the pump piston is operative to bias the pump piston and the bellcrank arm in the direction to move the squeeze lever away from the hand grip.ġ3. A rivet gun as recited in claim 1, wherein the squeeze lever is connected to the first piston assembly by a lever system, wherein the squeezing of the lever toward the hand grip causes a point in the system to move the first piston system.ġ2. A rivet gun as recited in claim 9, wherein the check valve is located in the said space to allow fluid flow only from the first piston system to the second piston system, wherein the space includes another check valve connected to allow the flow of fluid only from the reservoir to the first piston system, and wherein the space includes a manually operable valve to selectively connect the second piston system to the reservoir.ġ1. ![]() A rivet gun as recited in claim 8, wherein the reservoir bore and the power bore are separated by a substantial space, and wherein an imaginary extension of the pump bore passes through the space.ġ0. A rivet gun as recited in claim 1, wherein the second piston system includes a power bore extending longitudinally of the barrel, wherein the first piston system includes a pump bore extending at a right angle to a second piston system bore, and wherein the reservoir includes a bore aligned with the second piston system bore.ĩ. A rivet gun as recited in claim 5, wherein the reservoir consists of a bore in which a piston is slidably mounted, and wherein a coil spring lies between one end of the bore and the piston.Ĩ. A rivet gun as recited in claim 1, wherein the reservoir is expandible.ħ. A rivet gun as recited in claim 4, wherein the valve is operated by a movable lever mounted externally of the main body in a position such that it can be pressed by the thumb when the hand is wrapped around the grip.Ħ. A rivet gun as recited in claim 1, wherein a manually-operable valve is mounted to selectively connect the second piston system to the reservoir.ĥ. A rivet gun as recited in claim 1, wherein a check valve is connected to allow flow of fluid only from the reservoir to the first piston system.Ĥ. A rivet gun as recited in claim 1, wherein the check valve is arranged to allow fluid flow only from the first piston system to the second piston system.ģ. A rivet gun for use with a hollow rivet having a mandrel, comprisingĢ. Is claimed as new and desired to secure by Letters Patent isġ. The invention having been thus described, what
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