The present invention relates to a coupling device. More particularly, the present invention relates to a coupling device for releasably coupling with a bit or the like and allowing easy removal of the bit or the like.
The present invention is intended to provide a coupling device that mitigates and/or obviates the above-mentioned problems.
The present invention solves these and other problems in bit coupling devices by providing, in a preferred form, a coupling device including a body having an end adapted to be coupled with a handle. The other end of the body is adapted for removably receiving an object such as a bit or the like. The body includes a compartment having a receiving space adapted for receiving the object. The receiving space includes an inner periphery having a slanted face that extends longitudinally outward and radially inward from an inner end of the receiving space. A follower is mounted in the compartment and slidable in a longitudinal direction of the body. The follower includes an inner end and an outer end. The outer end of the follower includes a radially outer side and a radially inner side distant to the slanted face. The outer end of the follower further includes a restraining hole extending from the radially outer side through the radially inner side. A positioning member extends from the radially outer side through the restraining hole to the radially inner side. The positioning member is slidable along the slanted face. The maximum outer diameter of the positioning member is larger than the minimum diameter of the restraining hole. A first spring is mounted in the compartment and biases the follower outward toward the receiving space when the object is inserted into the receiving space and moves the follower longitudinally inward. The positioning member securely clamps the object in the receiving space between the follower and a portion of the inner periphery of the receiving space opposite to the follower. A radial clamping force is imparted from the slanted face through the positioning member to the object.
In the most preferred form, a support rod is mounted in the compartment and slidable in the longitudinal direction of the body. The support rod includes an inner portion having an inner end and an outer portion having an outer end. The support rod further includes a groove extending in a longitudinal direction of the body and through opposite sidewalls of the inner portion. An end wall defining an inner end of the groove forms the inner end of the inner portion. The follower includes an inner section, an outer section, and a transition section between the inner and outer sections. The inner section of the follower is slidably received in the groove of the support rod. The outer section of the follower is outside the groove and parallel to and spaced from the outer portion of the support rod. A magnet is mounted in the outer end of the outer portion of the support rod for attracting the object.
In the preferred form, the first elastic element is mounted between the inner end of the follower and an end wall of the compartment opposite to the receiving space. In the most preferred form, the inner end of the support rod includes a through-hole in communication with the groove of the inner portion of the support rod. The first elastic element is a coil spring having an end mounted around a protrusion on the inner end of the follower.
In the most preferred form, the body includes a reduced section having a guide slot in a peripheral wall thereof. The guide slot extends in a longitudinal direction parallel to a longitudinal axis of the body and in a radial direction to be in communication with the compartment. The inner end of the follower includes a transverse hole extending in a direction transverse to a longitudinal direction of the follower. A release member is mounted around the reduced section of the body and has an outer diameter not greater than the maximum outer diameter of the body. A pin is extended through a pin hole in the release member, the guide slot of the body, the transverse hole of the follower, and the groove of the support rod such that movement of the release member in the longitudinal direction away from the receiving space causes longitudinal movement of the follower and the positioning member away from the receiving space to release the radial clamping force, allowing removal of the bit from the receiving space.
In the most preferred form, the compartment of the body further includes a first shoulder, the outer portion of the support rod includes a second shoulder, and a second elastic element is mounted between the shoulders. The second elastic element is compressed when the object is received in the receiving space. When the release member is moved longitudinally away from the receiving space, the radial clamping force is released. Thus, the second elastic element pushes the object outward away from the receiving space. When the release member is released, the first elastic element pushes the object outward away from the receiving space such that an exposed portion of the object outside the receiving space is large enough to allow easy removal of the object from the receiving space.
In the most preferred form, the restraining hole includes a conic section and a rectilinear section. The conic section is adjacent to the radially outer side and tapers from the radially outer side toward the radially inner side. The rectilinear section is adjacent to the radially inner side and has a diameter substantially the same as the minimum inner diameter of the conic section. The positioning member is a ball having a diameter slightly smaller than the maximum inner diameter of the conic section and larger than the minimum inner diameter of the conic section.
The present invention will become clearer in light of the following detailed description of an illustrative embodiment of this invention described in connection with the drawings.
The illustrative embodiment may best be described by reference to the accompanying drawings where:
All figures are drawn for ease of explanation of the basic teachings of the present invention only; the extensions of the Figures with respect to number, position, relationship, and dimensions of the parts to form the preferred embodiment will be explained or will be within the skill of the art after the following teachings of the present invention have been read and understood. Further, the exact dimensions and dimensional proportions to conform to specific force, weight, strength, and similar requirements will likewise be within the skill of the art after the following teachings of the present invention have been read and understood.
Where used in the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the terms “first”, “second”, “end”, “portion”, “section”, “inner”, “outer”, “transition”, “longitudinal”, “axial”, “radial”, “peripheral”, “lateral”, “rectilinear”, “outward”, “inward”, and similar terms are used herein, it should be understood that these terms have reference only to the structure shown in the drawings as it would appear to a person viewing the drawings and are utilized only to facilitate describing the invention.
A coupling device according to the preferred teachings of the present invention is shown in
According to the preferred teachings of the present invention, a coupling device includes a body 10 having a coupling section 12 and a reduced section 10a that has an end coupled to a handle 11. The body 10 includes a compartment 14 defined therein and having a receiving space 13 defined in the other end of the body 10 (i.e., an outer end portion of the coupling section 12). In the preferred form shown, the receiving space 13 is hexagonal for receiving a bit 90 or the like. The compartment 14 extends in a longitudinal direction of the body 10 and includes a shoulder 142. The receiving space 13 includes an inner periphery having a slanted face 16 that extends longitudinally outward and radially inward from an inner end of the receiving space 13 (namely, the receiving space 13 extends longitudinally outward with a decreased inner diameter due to provision of the slanted face 16). The body 10 further includes a guide slot 15 in a peripheral wall of the reduced section 10a thereof and extending in a longitudinal direction parallel to a longitudinal axis of the body 10 and in a radial direction to be in communication with the receiving compartment 14. In the preferred form shown, the guide slot 15 extends through diametrically opposed sides of the peripheral wall of the reduced section 10a of the body 10.
According to the preferred teachings of the present invention, a follower 30 is received in the compartment 14 and slidable in the longitudinal direction of the body 10. The follower 30 includes an inner end 31 and an outer end 39. In the most preferred form shown, the follower 30 includes an inner section 37, an outer section 33 extending perpendicularly to the inner section 37, and a transition section 38 between the inner and outer sections 37 and 33. An elastic element 32 is mounted between the inner end 31 of the follower 30 and an end wall 141 defining the compartment 14. In the most preferred form shown, the inner end 31 of the follower 30 has a protrusion 311, and the elastic element 32 is a coil spring having an end mounted around the protrusion 311 of the inner end 31 of the follower 30. Furthermore, the inner end 31 of the inner section 37 of the follower 30 includes a transverse hole 312 extending in a direction transverse to a longitudinal direction of the follower 30. The outer end 39 of the outer section 33 of the follower 30 includes a radially outer side 35 and a radially inner side 36 distant to the slanted face 16. The outer end 39 of the outer section 33 of the follower 30 includes a restraining hole 331 extending from the radially outer side 35 through the radially inner side 36. A positioning member 34 extends from the radially outer side 35 of the outer end 39 through the restraining hole 331 to the radially inner side 36 of the outer end 39 of the follower 30. The maximum outer diameter of the positioning member 34 is larger than the minimum diameter of the restraining hole 331. In the most preferred form shown, the restraining hole 331 includes a conic section 332 and a rectilinear section 333. The conic section 332 is adjacent to the radially outer side 35 and tapers from the radially outer side 35 toward the radially inner side 36, and the rectilinear section 333 is adjacent to the radially inner side 36 and has a diameter substantially the same as the minimum inner diameter of the conic section 332. In the most preferred form shown, the positioning member 34 is in the form of a ball extending from the radially outer side 35 through the restraining hole 331 to the radially inner side 36 and having a diameter slightly smaller than the maximum inner diameter of the conic section 332 and larger than the minimum inner diameter of the conic section 332.
According to the preferred teachings of the present invention, a support rod 20 is mounted in the compartment 14 of the body 10 and slidable in the longitudinal direction of the body 10. The support rod 20 includes an inner end 22 and an outer end 21. In the most preferred form shown, the support rod 20 includes an inner portion 25 and an enlarged, outer portion 26. The inner portion 25 includes a groove 27 extending in the longitudinal direction of the body 10 and through opposite lateral sidewalls of the inner portion 25 into the outer portion 26. The inner section 37 of the follower 30 is slidably received in the groove 27. An inner end wall defining an inner end of the groove 27 forms the inner end 22 of the inner portion 25 and includes a through-hole 23 in communication with the groove 27. The inner section 37 of the follower 30 is slidably received in the groove 27 of the support rod 20, with the outer section 33 of the follower 30 located outside the groove 27 and parallel to and spaced from the outer portion 26 of the support rod 20. The inner end 31 of the follower 30 abuts against the inner end 22 of the support rod 20, with the protrusion 311 extending into the through-hole 23 of the inner end 22 of the support rod 20. The elastic element 32 mounted between the end wall 141 of the receiving compartment 14 and the inner end 31 of the follower 30 extends through the through-hole 23 of the inner end 22 of the support rod 20. A magnet 29 is mounted in the outer end 21 of the support rod 20. An elastic element 24 is mounted around the inner portion 25 of the support rod 20 and mounted between a shoulder 201 on the inner end of the outer portion 26 of the support rod 20 and the shoulder 142 of the body 10.
In the most preferred form shown, a release member 40 in the form of a sleeve is mounted around the reduced section 10a of the body 10 and includes a pin hole 42 extending through diametrically opposed sides of a periphery of the release member 40. A pin 41 is extended through the pin hole 42 of the release member 40, the guide slot 15 of the body 10, the transverse hole 312 of the inner end 31 of the follower 30, and the groove 27 of the inner portion 25 of the support rod 20. Thus, movement of the release member 40 in the longitudinal direction of the body 10 away from the receiving space 13 compresses the elastic elements 32 and 24 and causes longitudinal movement of the follower 30 and the support rod 20 away from the receiving space 13. The outer diameter of the release member 40 is not greater than that of the coupling section 12 of the body 10 such that the release member 40 mounted to the body 10 will not hinder operation of the body 10 in a limited space. The release member 40 may include an anti-slip portion 401 on an end thereof to allow easy grip by a user.
Now that the basic construction of the coupling device of the preferred teachings of the present invention has been explained, the operation and some of the advantages of the coupling device can be set forth and appreciated.
With reference to
With reference to
With reference to
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With reference to
It can be appreciated that the support rod 20 and the release member 40 can be omitted. Nevertheless, the support rod 20 provides reliable support for the bit 90, and the magnet 29 in the outer end 21 of the support rod 20 may securely retain the bit 90 in the body 10 while the release member 40 allows easy removal of the bit 90. It can be further appreciated that the coupling device according to the preferred teachings of the present invention can be used with bits 93 and 94 of other types including but not limited to those shown in
Thus since the invention disclosed herein may be embodied in other specific forms without departing from the spirit or general characteristics thereof, some of which forms have been indicated, the embodiments described herein are to be considered in all respects illustrative and not restrictive. The scope of the invention is to be indicated by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.
Number | Date | Country | Kind |
---|---|---|---|
96102203 A | Jan 2007 | TW | national |
Number | Name | Date | Kind |
---|---|---|---|
2751229 | Schultz | Jun 1956 | A |
2838266 | Rees | Jun 1958 | A |
3039781 | Bilz | Jun 1962 | A |
3398965 | Cox | Aug 1968 | A |
3521895 | Smith | Jul 1970 | A |
3975032 | Bent et al. | Aug 1976 | A |
4412764 | Wawrzyniak | Nov 1983 | A |
5011346 | Pfalzgraf | Apr 1991 | A |
5195761 | Eimer | Mar 1993 | A |
5316323 | Jovanovic | May 1994 | A |
5464229 | Salpaka | Nov 1995 | A |
6270085 | Chen et al. | Aug 2001 | B1 |
6364318 | Bedi et al. | Apr 2002 | B1 |
6530579 | Houben et al. | Mar 2003 | B1 |
6623220 | Nuss et al. | Sep 2003 | B2 |
7669860 | Chiang | Mar 2010 | B2 |
7823890 | Chen | Nov 2010 | B2 |
20010042964 | Bedi et al. | Nov 2001 | A1 |
20010046421 | Cochran et al. | Nov 2001 | A1 |
20080217870 | Shibata | Sep 2008 | A1 |
20100229693 | Chen | Sep 2010 | A1 |
Number | Date | Country | |
---|---|---|---|
20080176437 A1 | Jul 2008 | US |