Clamping Tool
A clamping tool has first and second handles operatively connected to first and second jaws, e.g. clamping or crimping jaws and a retractable third handle attached to the first handle. A spring biases the first and second handles toward a non-engaging position and a restraint arrangement maintains the position of the first and second handles against the biasing force of the spring as the handles move toward the engaging position. In use, the third and second handles are moved toward one another from the engaging position to the non-engaging position. Between the positions, the handles are released and the restraint arrangement maintains the handles in the released position. Thereafter, the first and second handles are engaged, and the handles are moved toward one another to move the handles and the jaws into the engaging position.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/811,611 filed on Jun. 7, 2006, and titled “CLAMPING TOOL”, which application is hereby incorporated by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention is directed to a clamping tool, e.g. a tool having moveable jaws for crimping PEX tubing and, in particular, to a crimping tool having three handles selectively engaged to move the jaws to crimp the PEX tubing.
2. Description of the Presently Available Technology
Crimping tools such as pliers and tools used with PEX tubing have been in existence for a long period of time. One type of crimping tool is shown in U.S. Pat. No. 5,267,464, which is hereby incorporated by reference. Essentially, these tools have jaws that are brought together by squeezing handles that co-act with the jaws. Typically, the handles are squeezed by one hand of the user, with the user's thumb on one handle and the user's fingers on the other handle
Sometimes, the jaws must be opened to a wide distance that makes it very difficult to squeeze the handle with one hand. As is appreciated by those skilled in the art, when the user of the tool is unable to position his/her thumb and fingers around the handles of the tool, the tool is not locked in the user's hand. The result is often uneven crimping of the PEX tubing and un-useable crimped PEX tubing.
Therefore, it is an object of the present invention to provide a crimping tool that is easy to operate with one hand when the handles are spaced a distance apart that makes it difficult to grasp with one hand, thereby eliminating the drawbacks of the presently available crimping tools.
SUMMARY OF THE INVENTIONThe present invention is a crimping tool having a crimping head with jaws coupled to a handle arrangement that includes two primary handles linked together and a secondary handle linked to one of the primary handles and positioned between the two primary handles.
Further, the present invention further relates to a clamping or crimping tool having a first jaw operatively connected to a first handle; a second jaw operatively connected to a second handle, wherein moving the first and second handles relative to one another moves the first and second jaws relative to one another, and a third handle between the first and second handles and connected to the first handle, wherein moving the second and third handles relative to one another moves the first handle and the second handle relative to one another to move the first jaw and the second jaw relative to one another. In one non-limiting embodiment of the invention, one of the jaws and its associated handle, e.g. the second jaw and the second handle are stationary, and the first handle and the third handle are moveable toward the second handle.
Still further, the present invention relates to closing jaws of a clamping tool, by, among other things, applying a force to maintain the first and second jaws spaced from one another in a non-engaging position, and to maintain the first and second handles operatively connected to the first and second jaws, respectively, in a first position; moving the second handle and a third handle connected to the first handle toward one another against the applied force to move the first and second jaws from the non-engaging position toward an engaging position and to move the first and second handles from the first position toward a second position; releasing the third handle, and engaging the first and second handles to move the first and second handles into the second position, and the first and second jaws into the engaging position.
BRIEF DESCRIPTION OF THE DRAWINGS
As used herein, spatial or directional terms, such as “inner”, “outer”, “left”, “right”, “up”, “down”, “horizontal”, “vertical”, and the like, relate to the invention as it is shown in the drawing figures. However, it is to be understood that the invention can assume various alternative orientations and, accordingly, such terms are not to be considered as limiting.
Before discussing several non-limiting embodiments of the invention, it is understood that the invention is not limited in its application to the details of the particular non-limiting embodiments shown and discussed herein, since the invention is capable of other embodiments. Further the terminology used herein to discuss the invention is for the purpose of description and is not of limitation. Still further, in the following discussion, unless indicated otherwise, like numbers refer to like elements.
Referring to
The discussion is now directed to a non-limiting embodiment of the crimping head subassembly 22 that can be used in the practice of the invention. With reference to
With particular reference to
For ease of discussion and a full appreciation of the invention, when the handles 28, are at their maximum spaced distance (see
With continued reference to
Shown in
In one non-limiting embodiment of the invention, a ratchet and pawl arrangement is used to prevent the handle 28 from moving away from the handle 30 by the biasing force of the spring 72 when the force moving the handle 28 toward the handle 30 is released. With continued reference to
With reference to
As is appreciated by those skilled in the art, sometimes, the jaws 24, 26 of the crimping tool in the non-engaging position must be opened to a wide distance that makes it very difficult to squeeze the handles 28, 30 into the engaging position with one hand. More particularly, when the user of the crimping tool is unable to position his/her thumb and fingers around the handles 28, 30 of the crimping tool, the tool is not locked in the user's hand. The result is often uneven crimping of the PEX tubing and un-useable PEX tubing. To eliminate this drawback of the presently available crimping tools, in one non-limiting embodiment of the invention a third handle or secondary handle 120 is pivotally attached to handle 28 via pins 122, 123. In one non-limiting embodiment of the invention, the handle 120 has a U-shaped cross section (see
As is now appreciated, the connection of the components of the crimping tool of the invention with pins, e.g. but not limited to the handles 28, 30 and 120; the middle link 80; the jaws 24, 26, and the springs 72, 104 is not limiting to the invention and any technique for pivotally connecting components known in the art can be used in the practice of the invention. Further, in the discussion of the invention, the jaw 24 was fixed. The invention, however, contemplates having the jaw 24 moveable, and the handles 28, 30 moveable toward and away from one another, to move the jaws toward and away from one another, e.g. from the non-engaging position to the engaging position, and from the engaging position to the non-engaging position.
Referring to
The handles 28, 30 are grasped and moved toward one another to crimp the buckle 33 and the ring 34 to provide a fluid seal between the pipe 36 and fitting 37. With the handles 28, 30 in the engaging position, the ratchet 90 is moved past the pawl 100 allowing the pawl 100 to move out of engagement with the ratchet to its initial position, and the biasing force of the spring 72 is neutralized, as discussed above. The handles 28, 30 are slightly moved apart to activate the biasing force of the spring 72 to move the handles 28, 30, and the jaws 24, 26, away from one another into the non-engaging position to release the buckle from between the jaws 24, 26.
As can be appreciated, the handle subassembly 23 can be used with other head arrangements such as pliers, for example. Further, because many varying and different embodiments of the invention can be made within the scope of the non-limiting embodiments discussed herein, it is understood that the details herein are illustrative of the invention, and the scope of the invention is not limited thereto. More particularly, the scope of the invention is to be given the full breath of the following claims, and any and all equivalents thereto.
Claims
1. A clamping tool comprising two jaws pivotally coupled to a handle assembly, the handle assembly including a first handle and a second handle co-acting with said jaws, and a third handle pivotally attached to said first handle and positioned between the first handle and the second handle.
2. A clamping tool comprising:
- a first jaw operatively connected to a first handle;
- a second jaw operatively connected to a second handle, wherein moving the first and second handles relative to one another moves the first and second jaws relative to one another; and
- a third handle between the first and second handles and connected to the first handle, wherein moving the second and third handles relative to one another moves the first handle and the second handle relative to one another to move the first jaw and the second jaw relative to one another.
3. The clamping tool according to claim 2, wherein the third handle is pivotally mounted to the first handle.
4. The clamping tool according to claim 2, further comprising a locking arrangement to prevent the first and second handles from moving away from one another as the third handle moves the first and second handles toward one another.
5. The clamping tool according to claim 4, further comprising a biasing member applying a biasing force to the first and second handles to move the first and second handles, and the first and second jaws away from one another.
6. The clamping tool according to claim 5, wherein the first and second jaws are in an engaging position when the first and second handles are at a minimum distance from one another; the first and second jaws are in a non-engaging position when the first and second handles are at a maximum distance to one another, and the biasing member applies the biasing force to the first and second handles when the first and second jaws are in a position other than the engaging position.
7. The clamping tool according to claim 4, wherein the locking arrangement comprises a pawl and ratchet with the pawl associated with a middle link having one end connected to the first handle and the opposite end of the middle link connected to the second handle, and the ratchet associated with the first handle.
8. The clamping tool according to claim 7, wherein the first and second jaws are in an engaging position when the first and second handles are at a minimum distance from one another; the first and second jaws are in a non-engaging position when the first and second handles are at a maximum distance to one another, and the pawl and ratchet are in a non-engaging position when the jaws are in an engaging position.
9. The clamping tool according to claim 8, further comprising a biasing member applying a biasing force to the first and second handles to move the first and second handles, and the first and second jaws away from one another when the first and second jaws are in a position other than the engaging position.
10. The clamping tool according to claim 9, wherein the biasing member applies a first predetermined biasing force on the first and second handles when the first and second jaws are in a position other than the engaging position, and the biasing member applies a second predetermine force on the first and second handles when the first and second jaws are in the non-engaging position, wherein the second predetermined force is greater than the first predetermined force.
11. The clamping tool according to claim 10, wherein the first and second jaws are jaws having half-holes for crimping tubing.
12. The clamping tool according to claim 10, wherein the first and second jaws are jaws having half-holes for engaging buckle of a crimping ring.
13. The crimping tool according to claim 1, further comprising:
- a first plate and a second plate spaced from one another, the first and second jaws between the first and second plates with the first jaw securely mounted on the first plate and having a portion of the first jaw extending beyond edge of the first plate, and the second jaw pivotally mounted between the first and second plates with a portion of the second jaw extending beyond the edge of the first plate, the portion of the first and second jaws each having a half hole with the half hole of the second jaw moveable toward and away from the half hole of the first jaw;
- an end of the first handle fixedly secured between the first and second plates adjacent the first jaw, and an end of the second handle pivotally mounted between the first and second plates;
- a biasing member connecting the ends of the first and second handles wherein moving the first and second handles toward one another moves the half holes of the first and second jaws toward one another against biasing action of the biasing member, and
- a middle link having one end pivotally mounted to the first handle and an opposite end pivotally mounted to the second handle, first part of a pawl and ratchet arrangement mounted to the middle link and second part of the pawl and ratchet arrangement mounted on the second handle wherein the first and second part of the pawl and ratchet arrangement contact one another as the first and second handles move toward the engaging position to prevent the first and second handles from moving away from one another under the biasing action of the spring when force acting on the handles is less than the force of the biasing member.
14. A method of closing jaws of a clamping tool, comprising:
- applying a force to maintain first and second jaws spaced from one another in a non-engaging position, and to maintain first and second handles operatively connected to the first and second jaws, respectively in a first position;
- moving the second handle and a third handle connected to the first handle toward one another against the applied force to move the first and second jaws from the non-engaging position toward an engaging position and to move the first and second handles from the first position toward a second position;
- releasing the third handle, and
- engaging the first and second handles to move the first and second handles into the second position, and the first and second jaws into the non-engaging position.
15. The method according to claim 14, wherein after the handles are released and before the first and second handles are engaged maintaining the first and second handles at the released position.
16. The method according to claim 14, after applying a force to maintain first and second jaws spaced from one another and before moving the second handle and a third handle connected to the first handle, positioning a buckle of clamping ring between the first and second jaws
Type: Application
Filed: Jun 6, 2007
Publication Date: Dec 20, 2007
Applicant: Zurn PEX, LLC (Commerce, TX)
Inventor: Brian Fiorisi (Royse City, TX)
Application Number: 11/758,693
International Classification: B21D 7/00 (20060101);