Two-stroke tool

A crimping tool comprising:

• a first, fixed, jaw member;
• a second, moving, jaw member pivotally connected to the first jaw member at a first pivot location;
• a first link pivotally connected to the second jaw member at a second pivot location;
• a second link pivotally connected to the first link at a third pivot and pivotally connected to the first fixed jaw member at a fourth fixed pivot location;
• a first, moving, handle attached to the third pivot;
• a second fixed handle rigidly connected to the first fixed jaw;
• a third link movably connected at a first end thereof to the first handle at a fifth pivot and pivotally connected at an opposite second end thereof to the first jaw member at a sixth fixed pivot;
• wherein the third link first end includes an elongated aperture with the fifth pivot pin positioned through the aperture, the elongated aperture having a first end distal to the sixth pivot and a second end proximal to the sixth pivot, which second aperture end defines the first position relative to the fifth pivot;
• a fourth link, also between the fifth and sixth pivot positions and adjacent to the third link, which fourth link may be disengaged or engaged at one end to move the fifth pivot pin, which is through the third link aperture and held in the moving handle, from the first to the second position in the third link first end aperture;
• wherein, closing the first handle toward the second handle drives the first and second links through the third pivot to rotate the second jaw member about the first pivot in a first rotational direction, to rotate the first link in the same first rotational direction, to rotate the second link in a second, opposite, rotational direction, and to rotate the third link in the first rotational direction about the sixth pivot, to close the first and second jaw members a first distance for the first position relative to the fifth pivot and to further close the first and second jaw members a second distance for the second position relative to the fifth pivot.

A crimping tool comprising:

• a first, fixed, jaw member;
• a second, moving, jaw member pivotally connected to the first jaw member at a first pivot location;
• a first link pivotally connected to the second jaw member at a second pivot location;
• a second link pivotally connected to the first link at a third pivot and pivotally connected to the first fixed jaw member at a fourth fixed pivot location;
• a first, moving, handle attached to the third pivot;
• a second fixed handle rigidly connected to the first fixed jaw;
• a third link movably connected to the first handle at a fifth pivot and pivotally connected at to the first jaw member at a sixth fixed pivot;
• a first biasing member which urges the third link in a first rotational direction to urge closing together of the first and second jaws and handles when no other force is exerted on the handles;
• wherein the first handle is configured to drive the first and second links through only the third pivot to rotate the second jaw member about the first pivot in a first rotational direction, and to rotate the first link in the same first rotational direction about both the second pivot and the third pivot, and to rotate the second link in a second, opposite, direction about both the third pivot and the fourth pivot, and to rotate the third link in the first rotational direction about the sixth pivot;
• and wherein the surface of the second pivot location pin in the first link contacts the second moving jaw at a first distance from the fourth pivot to close said second jaw a first distance and subsequently the second pivot location pin in the first link contacts the second moving jaw at a second distance from the fourth pivot to close said second jaw a second distance.

A crimping, grasping or cutting tool comprising:

• a first, fixed, jaw member;
• a second, moving, jaw member pivotally connected to the first jaw member at a first pivot location;
• a link with a first end pivotally connected to the second jaw member at a second pivot location;
• a first, moving, handle pivotally connected to the first link second end at a third pivot, and pivotally connected to the first fixed jaw member at a fourth fixed pivot location;
• a second, fixed, handle rigidly connected to the first fixed jaw;
• a first biasing member which urges the first and second handles together when no other force is exerted on the handles;
• wherein the first handle is configured to drive the link to rotate the second jaw member about the first pivot in a first rotational direction, and to rotate the first link in the same first rotational direction, as the handle rotates in a second opposite direction about the fourth pivot;
• and wherein the surface of the pivot pin at the second pivot location in the first link contacts the second moving jaw at a first distance from the fourth pivot to close said second jaw a first distance and subsequently the pivot pin at the second pivot location in the first link contacts the second moving jaw at a second distance from the fourth pivot to close said second jaw a second distance.

A cutting or crimping tool comprising:

• first and second jaws with first opposing cutting or crimping ends and second opposing pivot ends movably connected by a link with pivots at each link end located between the first and second ends of each jaw;
• the first jaw also movably connected to a first handle at a third pivot and the second jaw movable connected to a second handle at a fourth pivot;
• the two handles also movably connected at a fifth pivot with the walls of the first handle moving inside the walls of the second handle at the handles ends encompassing the third, fourth and fifth pivots;
• wherein as the two handles are moved together about the fifth pivot, the two jaws also move together at the first ends and apart at the second ends;
• and wherein the pivot pin at the third pivot is axially tapered and engages into a tapered recess in the third pivot location of the first jaw and both pin ends also engage the first handle at the third pivot location, such that the degree of final closure of the first jaws ends is determined by the axial position of the tapered third pivot pin;
• and wherein an inclined surface in the inside wall of the second handle and a biasing member moving with the third tapered pivot pin are configured to cooperatively urge the third second pivot pin axially in a first direction into the tapered recess and in a second direction out of the tapered such that successive handle strokes allow a succession of progressive jaw closures.

A crimping tool comprising:

• a first, fixed, jaw member;
• a second, moving, jaw member pivotally connected to the first jaw member at a first pivot location;
• a first moving handle pivotally connected to the second jaw member at a second pivot location;
• and
• a link movably connected at a first end to the first handle at a third pivot and pivotally connected at an opposite second end to the first jaw member at a fourth fixed pivot location;
• wherein the link first end comprises an aperture which defines the first and second positions of the link first end, the link first end being movable between first and second positions relative to the third pivot location;
• and wherein a pivot pin is positioned through the aperture that connects the link first end and the first handle;
• a second fixed handle rigidly connected to the first fixed jaw;
• a first biasing member to urge the link first end from the first position to the second position, producing an audible sound.
• wherein the first handle is configured to rotate in a first rotational direction toward the second handle to drive the first handle first end comprising the second and third pivots and the link through the third pivot to rotate the second jaw member about the first pivot in the first rotational direction, and to rotate the link in an opposite second rotational direction about both the fourth pivot;
• the first and second jaw members being configured to close a first distance when the link first end is in the first position and to further close a second distance when the link first end is in the second position;
• wherein the first biasing member is configured to urge the third link first end from the first position to the second position when a driving force on the handle is released, such that the relative jaw positions remain essentially the same at the first closed distance;
• and wherein a second biasing member urges the moving jaw in said first rotational direction to assist closing together of the first and second handles and to assist movement of the link first end between the first and second positions;
• wherein the first, moving, handle moves laterally away from the first pivot location during full opening of the jaws;
• wherein the second end of the link abuts the first jaw member or the second, fixed, handle when the first handle is moved to fully open, such that the link first end is set at the first position;
• and
• wherein the link aperture is configured such that the third pivot pin remains at the first position of the link first end when the handles and jaws are closed the first distance.