Patent Grant
8746113
The present invention relates to mechanisms for altering engagement forces between a universal joint and a tool attachment.
Universal joints have in the past been provided with mechanisms for detachably engaging tool attachments. U.S. Pat. Nos. 5,660,491 (Roberts, et al.) and 5,433,548 (Roberts, et al.), assigned to the assignee of the present invention, disclose several versions of such mechanisms. Other mechanisms for universal joints are described in U.S. Pat. No. 4,614,457 (Sammon, see column 3, line 32), and U.S. Pat. No. 5,291,809 (Fox, III), as well as in US published patent application 2005/0229752 A1 (Nickipuck).
In addition, many mechanisms have been described for detachably engaging tool attachments to an extension bar, and extension bars are on occasion connected to universal joints. See, for example, the mechanisms disclosed in U.S. Pat. No. 4,848,196 (Roberts, et al.), U.S. Pat. No. 5,214,986 (Roberts, et al.), U.S. Pat. No. 5,233,892 (Roberts, et al.), U.S. Pat. No. 5,501,125 (Roberts, et al.), and U.S. Pat. No. 5,644,958 (Roberts, et al.), all assigned to the assignee of the present invention. Other such mechanisms are described in U.S. Pat. No. 4,781,085 (Fox, III) and U.S. Pat. No. 4,768,405 (Nickipuck).
By way of introduction, the attached drawings show two different mechanisms for altering the engagement forces between the drive stud of a universal joint and a tool attachment. Both of these mechanisms include an actuating element and an engaging element, in which the actuating element extends across the universal joint near the coupling element of the universal joint. In one case the engaging element includes an obliquely-oriented pin, and in the other the engaging element includes a longitudinally-oriented pin. Both mechanisms are longitudinally compact, and they extend only a small distance beyond the outside diameter of the drive element.
The scope of the present invention is defined solely by the appended claims, which are not to be limited to any degree by the statements within this summary or the preceding background discussion.
The socket 26 is configured to couple the first part to any suitable torque transmitting tool, such as a wrench or an extension bar, for example. The drive stud 28 is configured for insertion into any suitable tool attachment, and it typically defines an out-of-round cross-section. For example, the drive stud 28 may have a square, hexagonal or other non-circular shape in cross section. The second part 14 will often define a circular cross section between the drive stud 28 and the arms 24, though this is not required. The drive stud 28 defines a central longitudinal axis 30, and the second part 14 cooperates with the coupling element 16 to define an aperture 32 that passes through the universal joint 10 between the coupling element 16 and the second part 14.
The first part 12 is free to pivot through a limited arc with respect to the coupling element 16 about the first pin 18, and the second part 14 is free to pivot through a limited arc with respect to the coupling element 16 about the second pin 20. These motions allow the universal joint 10 to rotate with the first part 12 positioned at a skew angle with respect to the second part. The arms 24 transmit torque between the coupling element 16 and the drive stud 28. The features of the universal joint 10 described above are conventional, and these features can be configured as described in greater detail in U.S. Pat. No. 5,433,548 (Roberts, et al.). For example, FIG. 1 of U.S. Pat. No. 5,433,548 is a perspective view that shows one possible relationship of the two spaced arms of the second part to the coupling element.
The universal joint 10 includes a mechanism for altering engagement forces between the universal joint 10 and a tool attachment, as described below. As used throughout this specification and the following claims, the term “tool attachment” refers to any attachment configured to be engaged by the drive stud 28, including but not limited to sockets, extension bars, certain ratchets, and the like.
In the embodiment of
The illustrated mechanism further includes an engaging element 50 moveably disposed in the guide 40. The engaging element 50 of this example includes a pin having a lower end 52 and an upper end 54. The illustrated engaging element 50 includes a retainer 56 such as a split washer received in a groove in the upper end 54. As shown, the lower surface of the retainer 56 functions as a support surface 58 for the engaging element 50, as described below. Alternatively, the head of the engaging element may be shaped and/or enlarged to provide a support surface without an additional element such as the illustrated retainer 56. The engaging element 50 defines an external shoulder 59 between the lower and upper ends 52, 54.
As used throughout this specification and the following claims, the term “engaging element” refers to one or a plurality of coupled components, at least one of which is configured for releasably engaging a tool attachment. Thus, this term encompasses both single part engaging elements and multi-part-assemblies (including, for example, the multiple part engaging elements shown in FIGS. 4-6 of U.S. patent application Ser. No. 60/796,382, filed May 1, 2006 and assigned to the assignee of this invention). This related patent application is hereby incorporated by reference in its entirety, except that in the event of any inconsistency between the present specification and this related patent application, the present specification controls.
The primary function of the engaging element 50 is to hold a tool attachment on the drive stud 28 during normal use. The lower end 52 of the engaging element 50 is configured to engage a tool attachment when the engaging element 50 is in an engaging position, and to release the tool attachment when the engaging element 50 is in a releasing position. As used throughout this specification and the following claims, the term “engaging position” does not imply locking the tool attachment in place against all conceivable forces tending to dislodge the tool attachment.
Though illustrated as a cylindrically-symmetrical pin in
The illustrated mechanism further includes an actuating element 60 which will be described in connection with
For any given collar design, the sloping arms 70, 72 are angled at an oblique angle with respect to the axis 30, and they serve to offset the central portion 62 relative to the collar 66 along the axis 30 such that the central portion 62 is further from the drive stud 28 in relation to the center of the collar annulus (measured along the axis 30) than it would be if the arms 70, 72 extended transversely to the axis 30. In
The sloping arm 70 defines an elongated slot 74 that receives the upper end 54 of the engaging element 50. The upper surface of the sloping arm 70 adjacent the slot 74 functions as a support surface 68 that in this example engages the support surface 58 of the retainer 56. Also, in this example the support surface 68 is oriented substantially transversely to the guide direction 42, though this is not required. In many cases it will be preferable to orient the support surface 68 so that it is not parallel either to the axis 30 or to the guide direction 42.
As shown in
Universal joints of the present invention preferably include at least one biasing element that provides automatic engagement with a tool attachment once the drive stud 28 has been inserted into the tool attachment. In some embodiments, such automatic engagement can operate after the exposed end of the engaging element 50 is pushed to a releasing position by a tool attachment as the drive stud 28 is inserted into the tool attachment. Automatic engagement can also be useful after the actuating element 60 has been used to move the engaging element 50 to a releasing position. In alternative embodiments in which engagement is to be manually initiated by an operator's movement of an actuating element, no biasing element may be required. In one alternative, a detent can be used to hold the actuating element in one or more positions, such as an engaging position and a releasing position.
The embodiment of
Many versions of this invention provide a concealed biasing element (1) that is protected against outside influences such as foreign object or material that may otherwise obstruct operation of the mechanism, and (2) that is unlikely to result in fragments of the biasing element escaping from the universal joint 10 in the event that the biasing element should break apart in use. In this example, the biasing element 90 is a compression-type coil spring that surrounds the engaging element 50 and is positioned within the guide 40, though many other types of biasing elements can be used to perform the biasing functions described above. In alternate embodiments, the biasing element may be implemented in other forms, placed in other positions, bias the engaging element and the actuating element in other directions, and/or be integrated with or coupled directly to other components.
As shown in
When external forces are removed and the collar 66 is allowed to move away from the position of
When the drive stud 28 is simply pushed into a tool attachment, the tool attachment can push the engaging element 50 into the drive stud 28, compressing the biasing element 90 in the process.
In this example, the region of contact between the engaging element 50 and the actuating element 60 remains inside the periphery of the second part 14, and the collar 66 can be provided with an unusually small outer diameter for a given size of the drive stud 28, even though the engaging element 50 slides obliquely in the second part 14.
An engaging element 110 is positioned in the guide 100, and this engaging element includes a ball 112, a ramp 114, and a shaft 116. The ramp 114 and the shaft 116 move as a unit and may be formed in one piece if desired. The ball 112 moves along the ramp 114 as the ramp 114 moves longitudinally in the guide 100. The upper end 118 of the shaft 116 defines a groove that receives a retainer 120, such as a split washer for example, and the underside of the retainer 120 forms a support surface 122. As discussed above, it is also possible to shape and/or enlarge the head of the upper end 118 to provide the support surface without the need for an additional part. The ramp 114 defines a shoulder 124 around the shaft 116.
Turning to
As before, the sloping arms 142, 144 offset the central portion 132 toward the coupling element 16 and away from the drive stud 28, and a first plane 146 transverse to the axis 30 and passing through the center of mass of the collar 136 is positioned between a second plane 148 transverse to the axis 30 passing through the center of mass of the central portion 132 and the drive stud 28.
A biasing element 180 is positioned around the shaft 116 within the guide 100 to bear on the shoulders 104, 124. The biasing element 180 defines a center of mass that lies within the second part 14. In this case the biasing element 180 biases the engaging element 110 by reacting against the second part 14. In this way, the biasing element 180 provides the desired biasing forces without engagement with the coupling element 16 and independent of any reaction against the coupling element 16.
When an operator wishes to release a tool attachment, the collar 136 is moved away from the drive stud 28, thereby compressing the biasing element 180 and moving the ramp upwardly in the view of
The embodiments illustrated in the figures both include actuating elements 60, 130 that are configured and positioned to minimize the overall length of the second part 14. The actuators 60, 130 are accessible from the periphery of the second part 14, and they include a central portion 62, 132 that crosses the central longitudinal axis 30. At least a portion of the actuating elements 60, 130 extends into the aperture 32 defined by the coupling element 16 and the second part 14, for at least some positions of the actuating element 60, 130. Similarly, at least some portion of the actuating elements 60, 130 extends between the load-bearing protruding elements 24 of the second part 14 for at least some positions of the actuating elements 60, 130.
Stated another way, the engaging element 50, 110 and/or the actuating element 60, 130 can be moved to a position that is close to the coupling element 16. With reference to
As another measure of the longitudinal compactness of the illustrated designs, the center of mass of the engaging element is positioned close to the wall of the second part farthest from the drive stud when the engaging element is in the rest position. With reference to
Throughout this description and in the appended claims, the following definitions are to be understood:
The term “coupled” and various forms thereof are intended broadly to encompass both direct and indirect coupling. Thus, a first part is said to be coupled to a second part when the two parts are directly coupled (e.g. by direct contact or direct functional engagement), as well as when the first part is functionally engaged with an intermediate part which is in turn functionally engaged either directly or via one or more additional intermediate parts with the second part. Also, two parts are said to be coupled when they are functionally engaged (directly or indirectly) at some times and not functionally engaged at other times.
The term “engage” and various forms thereof, when used with reference to retention of a tool attachment, refer to the application of any forces that tend to hold a tool and a tool attachment together against inadvertent or undesired separating forces (e.g., such as may be introduced during use of the tool). It is to be understood, however, that engagement does not in all cases require an interlocking connection that is maintained against every conceivable type or magnitude of separating force.
The designations “upper” and “lower” used in reference to elements shown in the drawings are applied merely for convenience of description. These designations are not to be construed as absolute or limiting and may be reversed. For the sake of clarity, unless otherwise noted, the term “upper” generally refers to the side of an element that is further from a coupling end such as a drive stud. In addition, unless otherwise noted, the term “lower” generally refers to the side of an element that is closer to the coupling end.
The term “longitudinal” refers to directions that are generally parallel to the length direction of the drive stud. In the embodiments described above, the longitudinal direction is generally parallel to the longitudinal axis 30.
The term “element” includes both single-part components and multiple-part components. Thus, an element may be made up of two or more separate components that cooperate to perform the function of the element.
As used herein, movement of an element toward a position (e.g., engaging or releasing) or toward a particular component (e.g., toward or away from a drive stud) includes all manner of longitudinal motions, skewed motions, rotational motions, and combinations thereof.
The term “relative movement” as applied to translation between two parts refers to any movement whereby the center of mass of one part moves in relation to the center of mass of another part.
As used herein, the term “biasing element” refers to any device that provides a biasing force. Representative biasing elements include but are not limited to springs (e.g., elastomeric or metal springs, torsion springs, coil springs, leaf springs, tension springs, compression springs, extension springs, spiral springs, volute springs, flat springs, and the like), detents (e.g., spring-loaded detent balls, cones, wedges, cylinders, and the like), pneumatic devices, hydraulic devices, and the like, and combinations thereof.
The tools described above are characterized in varying degrees by some or all of the following features: simple construction; a small number of easily manufactured parts; easy access to an operator using the tool in a tight and/or restricted workspace; rugged, durable, and reliable construction; an ability to accommodate various tool attachments, including those with various sizes and configurations of recesses designed to receive a detent; self adjusting for wear; substantially eliminating any precise alignment requirements; readily cleanable; presenting a minimum of snagging surfaces; extending outwardly from the tool by a small amount; and having a short longitudinal length.
The mechanisms illustrated in the drawings include actuating elements that have a maximum cross-sectional dimension that is only slightly larger that that of the second part on which they are mounted. Such an actuating element brings several advantages. Since the actuating element has a small outside diameter, the resulting tool is compact and easily used in tight spaces. Also, the actuating element is less subject to being accidentally moved to the releasing position during use, because it presents a smaller cross-section than many tool attachments.
Of course, it should be understood that a wide range of changes and modifications can be made to the preferred embodiments described above. For example, the actuating element may employ only one sloping arm rather than the pair of opposed sloping arms illustrated. Also, for convenience various positions of the engaging elements and the actuating elements have been described. It will of course be understood that the term “position” is intended to encompass a range of positions, as is appropriate for tool attachments that have recesses and bores of varying shapes and dimensions.
It is therefore intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, which are intended to define the scope of this invention.
This application is a continuation of prior application Ser. No. 12/315,260, filed Dec. 1, 2008, now U.S. Pat. No. 8,047,103 which is a continuation of international application no. PCT/US2007/011344, filed May 10, 2007, which claims the benefit of U.S. Provisional Application No. 60/810,239, filed Jun. 2, 2006. The entire contents of each of the three above-identified documents are hereby incorporated herein by reference.
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| Number | Date | Country |
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| 1457291 | Sep 2004 | EP |
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| Entry |
|---|
| International Search Report for corresponding International Application No. PCT/US2007/011344 dated Mar. 27, 2008 (two pages). |
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| Number | Date | Country | |
|---|---|---|---|
| 20120036969 A1 | Feb 2012 | US |
| Number | Date | Country | |
|---|---|---|---|
| 60810239 | Jun 2006 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12315260 | Dec 2008 | US |
| Child | 13247324 | US | |
| Parent | PCT/US2007/011344 | May 2007 | US |
| Child | 12315260 | US |
