1. Field of Invention
The present invention relates to clamps such as pipe clamps, and in particular to pipe clamps having a releasably attached clamp body restraining motion of the support past the end of the clamp body.
2. Discussion of Related Art
Clamps such as bar clamps and pipe clamps have been widely used in a variety of forms. For example, U.S. Pat. No. 5,775,680 to Sorensen et al., the entire contents of which are incorporated herein by reference, discloses a bar clamp with a retainer within a clamp body through which a threaded screw is fed.
EP0274746A1 to Kloepfer et al. discloses a clamp with a jaw that has a spring-loaded tilt plate for securing a displaceably mounted jaw against a rail.
Neither of the above described references addresses the problem solved by the present invention, namely the need for a releasable clamp body that is restrained against motion past the end of a bar, pipe, or support.
One aspect of the present invention regards a clamp that includes a support having a first end and a second end and defining a support axis. A workpiece supporting element is mounted to the support and a clamp body releasably connected to the support through a channel formed in the clamp body wherein the first end is inserted into the channel. The clamp body includes a retainer movably mounted to the clamp body to engage the support selectively and thereby to hold the clamp body selectively against movement with respect to the support in at least a first direction along the support axis. The clamp body further includes a jaw mounted on the clamp body and opposing the workpiece supporting element and an end cap opposite the jaw on the clamp body wherein the clamp body is restrained from motion along the support axis towards the workpiece supporting element beyond the first end of the support.
In another aspect of the present invention, a clamp body is provided with a channel formed in the clamp body and a retainer is movably mounted in the clamp body. A jaw is mounted on the clamp body and an end cap blocking one end of the channel.
A third aspect of the present invention regards a method for orienting a clamp body with respect to a support of a clamp. The method includes providing a clamp body and support unattached to one another and placing a retainer in the clamp body in a release position by depressing the retainer. Placing a channel of the clamp body and a first end of the support in substantial alignment, inserting the clamp body onto the support until the first end impinges on an end cap of the clamp body and placing the retainer in an inclined position by releasing the retainer so that the clamp body is attached to the support.
A fourth aspect of the present invention regards a method for orienting a clamp body with respect to a support of a clamp by providing a support with a clamp body secured to the support. The method further includes placing a retainer in the clamp body in a release position by depressing the retainer. At the release position, the clamp body is moved in a first direction along the support but is prevented from moving in a direction opposite the first direction. Next, the clamp body is removed from the support.
In the drawings,
A retainer 26 is mounted to the clamp body 20 to engage the support 12 selectively and to hold the clamp body 20 selectively against movement with respect to the support 12 in at least a first direction A along the support axis 14. An end cap 32 is present at an end of the clamp body 20 nearest the handle 52.
Note that the retainer 26 may be embodied as one or more tabs 34 positioned around the support 12. Each tab 34 includes a closed opening that generally corresponds to the cross-sectional shape of the support 12. Each tab 34 is contained within clamp body 20 and has two ends 36 and 38 that extend through side openings 40 and 42 of the clamp body 20. The tabs 34 are coupled to the clamp body 20 by a spring mechanism 44 (also see FIGS. 3A-B) which is partially compressed when the retainer 26 is in the inclined position (in which the retainer 26 holds the clamp body 20 against movement along direction A with respect to the support 12 while allowing movement along direction B shown in
As shown in
As shown in
The workpiece engaging element 50 operates in a manner similar to a like element disclosed in U.S. Pat. No. 5,775,680. In particular, the workpiece engaging element 50 includes a channel 53 that allows the support 12 to be inserted therethrough so that end 18 extends past the channel 53. A spring mechanism, such as the helical spring 55, is positioned within the workpiece engaging element 50 so that its longitudinal axis coincides with axis 14. One end of the spring 55 contacts the interior wall of the distal end of the workpiece engaging element 50 while the other end of the spring contacts the retainer 30. The retainer 30, which includes tabs like tabs 34, is biased by a spring 55 to engage the support 12 in a known manner. For example, when the spring 55 is partially compressed the retainer 30 is in the inclined position shown in
A method for attaching and removing a clamp body 20 to a support 12 and a method of clamping a workpiece is understood upon a review of FIGS. 1 and 2. For example, suppose the support 12 is unattached to either of the clamp body 20, the workpiece supporting element 22 and the workpiece engaging element 50. In this case, the workpiece engaging element 50 is attached to the support 12 near end 18 in a well known manner. Next, the end 16 of the support 12 is inserted through the opening 51 of the workpiece supporting element 22 and approaches the clamp body 20. Prior to the end 16 reaching the clamp body 20, the retainer 26 is depressed until the retainer 26 is in a horizontal release position by depressing the retainer 26 (indicated by the arrow in
It should be understood that the above described attachment process is but one of many variations possible. For example, the clamp body 20 and the workpiece supporting element 22 can be attached to the support 12 prior to attachment of the workpiece engaging element 50 to the support 12.
Once the clamp body 20, workpiece supporting element 22 and the workpiece engaging element 50 are attached to the support 12, a workpiece W is placed against the jaw 28 of the workpiece engaging element 50. The workpiece supporting element 22 is then moved along the support 12 towards the workpiece W by actuating the handle 52 of the screw 48 until the jaw 46 contacts the workpiece W. At this position, the workpiece W is held between the jaw 28 of the workpiece engaging element 50 and the jaw 46 of the workpiece supporting element 22.
The workpiece W is unclamped in three possible ways. First, the retainer 30 is moved to its horizontal release position as shown in
Within the scope of the present invention, further embodiment variations of course also exist besides the explained example. For example, the present invention can be used in a variety of bar clamps including pipe clamps. Furthermore, the workpiece supporting element 22 and the screw 48 can be removed and the jaw can be attached to the clamp body 20. In this scenario, the clamp body is slid along the support 12 so as to have the jaw of the clamp body engage the workpiece.