Applicants claim, under 35 U.S.C. §§ 120 and 365, the benefit of priority of the filing date of Jul. 7, 2003 of a Patent Cooperation Treaty patent application, copy attached, Serial Number PCT/US2003/021197, filed on the aforementioned date, the entire contents of which are incorporated herein by reference, wherein Patent Cooperation Treaty patent application Serial Number PCT/US2003/021197 was published under PCT Article 21(2) in English and Applicants claim, under 35 U.S.C. § 119, the benefit of priority of the filing dates of: Jul. 9, 2002, of U.S. Provisional Patent Application Ser. No. 60/395,800 filed on the aforementioned date, the entire contents of which are incorporated herein by reference, and 2) Jun. 2, 2003, of U.S. Provisional Patent Application Ser. No. 60/475,132 filed on the aforementioned date, the entire contents of which are incorporated herein by reference.
1. Field of the Invention
This invention relates to a clamp that has a braking lever that is activated on a side of the clamp.
2. Discussion of Related Art
Bar clamps for clamping objects into position are well known in the art. In recent years, advances have been made in bar clamps that enable them to be operated by a single hand. An example of such a bar clamp is disclosed in U.S. Pat. No. 4,926,722 which discloses a trigger mechanism to move a movable clamping jaw toward a fixed clamping jaw. The movable clamping jaw is attached to a moving bar.
Spreading clamps that are operable by a single hand are also well known, such as described in U.S. Pat. No. 5,009,134. Again, the movable jaw is attached to a bar.
In bar clamps and spreading clamps similar to those disclosed above, a braking lever is positioned forwardly of the trigger handle so that the braking lever is actuated by a finger of the hand holding the clamp. In other types of bar clamps, the braking lever is positioned rearwardly of the trigger handle so that the braking lever is actuated by a thumb of the hand holding the clamp.
One disadvantage of such braking levers is that they often require significant pressure/force to release the braking lever.
A second disadvantage of such braking levers is that they typically create “pinch points.” For example, in the case of the above-mentioned thumb actuated braking lever, the braking lever can pinch the gripping band as the braking lever moves towards the clamp body.
A third disadvantage for forwardly positioned braking levers is that there are isolated instances where the braking levers can be positioned so near the workpiece being clamped that they interfere with the workpiece.
One aspect of the present invention regards a clamp that includes a first clamping jaw, a support element to which the first clamping jaw is attached and a clamp body having a first slot through which the support element passes along a first direction and a second slot that faces in a direction that is substantially perpendicular to the first direction. A handle grip attached to the clamp body. A braking lever that is normally positioned so as to engage the support element so as prevent the support element and the first clamping jaw from moving away from the second clamping jaw and allowing the first clamping jaw to move towards the second clamping jaw. A brake actuator that contacts the braking lever and comprises an ear that extends through the second slot.
A second aspect of the present invention regards a clamp that includes a first clamping jaw, a support element to which the first clamping jaw is attached and a clamp body having a first slot through which the support element passes along a first direction and an opening that faces in a direction that is substantially perpendicular to the first direction. A handle grip attached to the clamp body, a braking lever and a brake actuator that contacts the braking lever and includes an engagement element that extends through the opening.
One or more of the above aspects of the present invention provides the advantage of improving the flexibility in operating a clamp.
One or more of the above aspects of the present invention provides the advantage of decreasing the amount of pressure force required to release a braking lever.
One or more of the above aspects of the present invention provides the advantage of increasing control of a clamp when releasing a braking lever.
One or more of the above aspects of the present invention provides the advantage of decreasing the chance that the braking lever engages the hand of the user of the clamp.
One or more of the above aspects of the present invention provides the further advantage of reducing the chance that a braking lever will interfere with a workpiece that is being clamped by a clamp.
The foregoing features and advantages of the present invention will be further understood upon consideration of the following detailed description of the invention taken in conjunction with the accompanying drawings, in which:
Referring now to the drawings wherein like reference characters designate identical or corresponding parts throughout the several figures, and in particular
An example of a possible detachable structure is shown in
As shown in
A trigger handle 118 is pivotably mounted to the body 112 below and between the slots 106 and 108. In particular, the trigger handle 118 includes a pair of female receptors 123 located on opposite sides of the trigger handle 118. Corresponding annular male members 125 formed in left and right portions 127, 129 of the clamp body 112 are inserted into the female receptors 123. Once inserted in the receptors 123, the trigger handle 118 is pivotable about an axis P aligned with the receptors 123. The axis P is positioned approximately 1.5 inches below the bottom of the bar 104, approximately 1.25 inches from a proximal edge of the slot 108 and approximately ⅜ inches from a distal edge of the slot 106.
The bar 104 and clamping jaw 102 are incrementally moved toward the fixed clamping jaw 116 via the actuation of one or more driving levers 146. As shown in
As shown in
As shown in
If a force is applied to the movable jaw 102 of
Incremental motion of the bar 104 and the attached movable jaw 102 toward the fixed jaw 116 is made possible by squeezing the trigger handle 118 one or more times in a direction opposite to that indicated by the arrow 176. Squeezing of the trigger handle 118 causes the engagement piece 159 of the trigger handle 118 to push the driving lever 146 along the direction 176 shown in
Note that when the driving lever 146, braking lever 178 and the trigger handle 118 are not manually engaged and a force is applied to the movable jaw 102 of
A clamped object is released from the jaws 102 and 116 by actuating a butterfly-shaped brake actuator 186. The brake actuator 186 is preferably injected molded resin and has a thickness of approximately 0.25 inches. As shown in
The brake actuator 186 has a top insertion member 196 and a bottom insertion member 198 that are used to prevent swaying of the brake actuator 186. In particular, the insertion member 196 is received within a semi-circular recess formed when a partial recess 200 of one of the parts 127, 129 is adjacent to a mirror image recess formed in the other part when the parts are joined to one another. Similarly, a top portion of the insertion member 198 is received within a semi-circular recess formed when a partial recess 202 of one of the parts 127, 129 is adjacent to a mirror image recess formed in the other part. The brake actuator 186 is further constrained in its movement by having the left and right ears 204 of the bottom base 192 extending through side rectangular apertures 206 formed in the parts 127, 129. The ears 204 extend past the apertures 206 and the clamp body 112 by an amount ranging from ⅝ inches to ¾ inches. The apertures 206 are aligned with one another and face in a direction substantially perpendicular to direction 176. As shown in
One mode of actuation of the brake actuator 186 is accomplished by having the thumb of the hand grasping the handle grip 110 and the trigger handle 118 be positioned so as to press against a rear face 214 of an ear 204 nearest the thumb. Pressing the brake actuator 186 in this manner causes the insertion members 196, 198 to be pressed into the recesses. Such pressing also causes the pressed ear 204 of the brake actuator 186 to pivot away from the braking lever while the unpressed ear pivots towards the braking lever about an axis L that is aligned with and intersects the insertion members 196, 198. Consequently, the rib 188 associated with the unpressed ear contacts the front face of the braking lever 178 causing the braking lever 178 to pivot about the pivot element 182 to a substantially vertical position with respect to the direction of intended motion of the bar 104. Note that in the above actuation process, the brake actuator 186 allows most of the hand grasping the clamp to stay in contact with the clamp while the thumb engages a single ear thus allowing for better control of clamp when releasing the braking lever 178. Note that if both rear faces of the ears 204 are pressed simultaneously and equally, the ears 204 will be unable to pivot about axis L and so the bottom base 109 will be unable to cause the braking lever 178 to move to the substantially vertical position.
A second mode of actuation of the brake actuator 186 is accomplished by simultaneously pressing against one or both front faces 208 of the ears 204. Pressing the brake actuator 186 in this manner causes the insertion members 196, 198 to be removed from the recesses and thus reduces their ability to pivot about axis L. Such pressing also causes the pressed ears 204 to translationally move toward the braking lever 178. Consequently, both ribs 188 contact the front face of the braking lever 178 causing the braking lever 178 to pivot about the pivot element 182 to a substantially vertical position with respect to the direction of intended motion of the bar 104.
In either one of the modes of actuation of the brake actuator discussed above, once the vertical position is achieved, the edges of the opening of the braking lever 178 no longer bind with the bar 104. Accordingly, the bar 104 is free to slide in either direction through the openings in the driving and braking levers 146, 178. Based on the above description of the two modes of actuation, the brake actuator 186 increases the flexibility of operating the clamp by allowing actuation of the ears at either side of the clamp body 112 and from either face of the ears. Furthermore, the improved moment arm of the brake actuator that acts on the braking lever decreases the amount of pressure/force required to release the braking lever.
Note that the resin material of the brake actuator 186 reduces the shock transmitted from the braking lever to the hand holding the clamp when the braking lever is released. The side position of the ears 204 of the brake actuator 186 provides the further advantages of reducing the risk of interference of the brake actuator with the workpiece being clamped by the clamp and reducing risk of pinching the hand of the user of the clamp.
Note that the bar 104 has a rectangular cross-section. Of course, the bar 104 may have other cross-sectional shapes, such as a square, a circle, or a triangle. The openings in the driving lever 146 and the braking lever 178 are shaped to accommodate the cross-sectional shape of the bar 104 to provide proper binding interference with the bar 104. Note that the bar 104 has a second opening 210. A cylindrical stop element 212 may be inserted into and permanently attached within the opening 212 so that the stop element 212 extends substantially perpendicular to the longitudinal axis of the bar 104. As the movable jaw 102 is moved away from the fixed jaw 116, the stop element 212 nears the rear of the slot 108. Upon reaching the rear of the slot 108, the ends of the stop element 212 contact the clamping body 112 outside of the slot 108. Thus, the stop element 212 prevents the movable jaw 102 from moving further away from the fixed jaw 116.
The bar clamp 100 of
Other embodiments of a clamp in accordance with the present invention are shown in
As shown in
A trigger handle 118 is pivotably mounted to the body 312 below and between the slots 106 and 108. In particular, the trigger handle 118 includes a pair of female receptors 123 located on opposite sides of the trigger handle 118. Corresponding annular male members 125 formed in left and right portions 127, 129 of the clamp body 112 are inserted into the female receptors 123. Once inserted in the receptors 123, the trigger handle 118 is pivotable about an axis P aligned with the receptors 123.
The bar 104 and clamping jaw 102 are incrementally moved toward the fixed clamping jaw 116 via the actuation of one or more driving levers 146. As shown in
As shown in
As shown in
If a force is applied to the movable jaw 102 of
Incremental motion of the bar 104 and the attached movable jaw 102 toward the fixed jaw 116 is made possible by squeezing the trigger handle 118 one or more times in a direction opposite to that indicated by the arrow 176. Squeezing of the trigger handle 118 causes the engagement piece 159 of the trigger handle 118 to push the driving lever 146 along the direction 176 shown in
Note that when the driving lever 146, braking lever 178 and the trigger handle 118 are not manually engaged and a force is applied to the movable jaw 102 of
A clamped object is released from the jaws 102 and 116 by actuating a brake actuator 386. As shown in
The other engagement element 390 has a shape that is similar to that of the engagement element in that it has a rounded top portion 400, a cylindrical section 402 and a conical-like surface 404 that are identical in configuration as items 390, 392 and 394 of the engagement element 388 as described previously. The engagement element 390 further includes an annular neck 406 that has an interior space that receives the longer annular piece 408. As shown in
The cylindrical sections 392 and 402 are inserted into circular openings formed in the left and right portions 127, 129 of the clamp body 312 (note that the portions 127, 129 and 112 are schematically depicted in
Actuation of the brake actuator 386 is accomplished by having the thumb of the hand grasping the handle grip 110 and the trigger handle 118 be positioned so as to press against the nearest one of the top portions 391 and 400. Pressing either one of the top portions 391, 400 causes the corresponding cylindrical section and conical-like surface to translate towards and enter the cavity 117 as shown in
Once the vertical or substantially vertical position is achieved, the edges of the opening of the braking lever 178 no longer bind with the bar 104. Accordingly, the bar 104 is free to slide in either direction (see double arrow of
During pressing of one or more of the engagement elements 388, 390, the spring 398 is compressed as shown in
Note that the bar 104 has a rectangular cross-section. Of course, the bar 104 may have other cross-sectional shapes, such as a square, a circle, or a triangle. The openings in the driving lever 146 and the braking lever 178 are shaped to accommodate the cross-sectional shape of the bar 104 to provide proper binding interference with the bar 104. Note that the bar 104 has a second opening 210. A cylindrical stop element 212 may be inserted into and permanently attached within the opening 212 so that the stop element 212 extends substantially perpendicular to the longitudinal axis of the bar 104. As the movable jaw 102 is moved away from the fixed jaw 116, the stop element 212 nears the rear of the slot 108. Upon reaching the rear of the slot 108, the ends of the stop element 212 contact the clamping body 112 outside of the slot 108. Thus, the stop element 212 prevents the movable jaw 102 from moving further away from the fixed jaw 116.
The bar clamp 300 of
The foregoing description is provided to illustrate the invention, and is not to be construed as a limitation. Numerous additions, substitutions and other changes can be made to the invention without departing from its scope as set forth in the appended claims.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US03/21197 | 7/7/2003 | WO | 00 | 11/14/2005 |
Publishing Document | Publishing Date | Country | Kind |
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WO2004/004976 | 1/15/2004 | WO | A |
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