Patent Grant
10766125
The present invention is a Continuation-In-Part application of applicant's former application with the application Ser. No. 15/721,737, filed on Sep. 30, 2017.
U.S. Pat. No. 9,278,435 is one previous invention of the present inventors', which discloses and comprises a mounting seat 10, a driving shaft 20, four pawls 30, four springs 40, a fixing ring 50, a control member 60, a bead 70, a positioning spring 71, a C-clip 80 and a clipping member 81. The rear side of the mounting seat 10 is connected with a handle (not shown) and has a space 11 defined in the front side thereof. Two first slot 112 and two second slots 113 are defined in the inside of the space 11. The first and second slots 111, 113 are located symmetrically in opposite directions to each other. Each of the first slots 111 has a first hole 112 defined in the inner portion thereof, and each of the second slots 113 has a second hole 114 defined in the inner portion thereof. A passage 12 is defined through the mounting seat 10 and has a smaller diameter. A reception hole 13 is defined in the wall of the mounting seat 10. The mounting seat 10 has two fixing members 14 and four fixing slots 15 defined in the front side thereof. A block 16 extends from the outside of the mounting seat 10 and located in opposite to the reception hole 13.
The driving shaft 20 has a ratchet portion 21 which has a larger outer diameter and is located in the space 11. The ratchet portion 21 has multiple teeth and concavities which are located alternatively to the teeth. A section 22 with a smaller diameter extends from the rear end of the driving shaft 20 and is rotatably inserted through the passage 12. A groove 23 is defined in the outer periphery of the rear end of the driving shaft 20 and located beyond the mounting seat 10. A working end 24 is formed on the front end of the driving shaft 20 and has a polygonal recess such as a rectangular recess or a hexagonal recess, so as to be connected with a driving member, a bolt, a nut, a socket or a connection rod. An annular slot 25 is defined in the outer periphery of the driving shaft 20.
Four pawls 30 are respectively located in the first and second slots 111, 113, and each pawl 30 has a bottom insertion 31 and a top insertion 32 extending from two ends of one side thereof. The bottom insertions 31 of the pawls 30 in the first slots 111 are pivotably inserted into the first holes 112 so that each of the pawls 30 is pivotable to engage the other side thereof with one of the concavities of the ratchet portion 21. Therefore, the driving shaft 20 is driven to rotate counter clockwise by rotating the mounting seat 10 by the engagement between the pawls 30 in the first slots 111 and the ratchet portion 21 of the driving shaft 20. The bottom insertions 31 of the pawls 30 in the second slots 113 are pivotably inserted into the second holes 114 so that each of the pawls 30 is pivotable to engage the other side thereof with one of the concavities of the ratchet portion 21. Therefore, the driving shaft 20 is driven to rotate clockwise by rotating the mounting seat 10 by the engagement between the pawls 30 in the second slots 113 and the ratchet portion 21 of the driving shaft 20.
Four springs 40 are respectively located in the two first slots 111 and the two second slots 113 and provide a force to pivot the pawls 30 to engage with the ratchet portion 21. The springs 40 in the first slots 111 each are biased between the inside of the first slot 111 and the pawl 30 corresponding thereto, and the springs 40 in the second slots 113 each are biased between the inside of the second slot 113 and the pawl 30 corresponding thereto. By the force from the springs 40, the four pawls 30 are pivoted and engaged with the concavities of the ratchet portion 21.
When the driving shaft 20 is rotated counter clockwise, the teeth of the ratchet portion 21 drive the pawls 30 in the first slots 111 to compress the springs 40 on respective insides of the pawls 30 so that the driving shaft 20 is freely rotated. When the driving shaft 20 is rotated clockwise, the teeth of the ratchet portion 21 drive the pawls 30 in the second slots 113 to compress the springs 40 on respective insides of the pawls 30 so that the driving shaft 20 is freely rotated.
The fixing ring 50 is a ring-shaped member and is connected to the front side of the mounting seat 10, and has four through holes 51, two apertures 52 and four protrusions 53. The top insertions 32 of the four pawls 30 are pivotably inserted into the four through holes 51. The two fixing members 14 are inserted into the two apertures 52. The four protrusions 53 are engaged with the four fixing slots 15.
The control member 60 is rotatably mounted to the mounting seat 10 and has a mounting hole 61 defined therethrough and the driving shaft 20 rotatably extends through the mounting hole 61. Two control plates 62 symmetrically extend from the inner periphery of the mounting hole 61. When the control member 60 is rotated clockwise, the two control plates 62 pivot the two pawls 30 in the second slots 113 to compress the springs 40 and remove the two pawls 30 in the second slots 113 from the concavities of the ratchet portion 21, so that the driving shaft 20 is freely rotated counter clockwise relative to the mounting seat 10.
When the control member 60 is rotated counter clockwise, the two control plates 62 pivot the two pawls 30 in the first slots 111 to compress the springs 40 and remove the two pawls 30 in the first slots 111 from the concavities of the ratchet portion 21, so that the driving shaft 20 is freely rotated clockwise relative to the mounting seat 10. The control member 60 has three positioning slots 63 and a restriction slot 64 defined therein. The block 16 is movable in the restriction slot 64. When the block 16 contacts one end of the restriction slot 64, the two control plates 62 remove the two pawls 30 in the first slots 111 from the concavities of the ratchet portion 21. When the block 16 contacts the other end of the restriction slot 64, the two control plates 62 remove the two pawls 30 in the second slots 113 from the concavities of the ratchet portion 21. The bead 70 is axially and movably located in the reception hole 13. The positioning spring 71 is located in the reception hole 13 and biases the bead 70 outward to be engaged with one of the positioning slots 63, so as to position the control member 60 at a first position where the driving shaft 20 is freely rotated counter clockwise, a second position where the driving shaft 20 cannot rotate freely, and a third position where the driving shaft 20 is freely rotated clockwise.
The C-clip 80 is engaged with the groove 23 of the driving shaft 20 and restricts the driving shaft 20 from being separated from the front side of the mounting seat 10. The clipping member 81 is engaged with the annular slot 25 of the driving shaft 20 to restrict the control member 60 from being separated from the front side of the mounting seat 10.
The disadvantages of the above-mentioned previous patent are: 1) the two pawls 30 are pivoted in the first slots 111 and second slots 113 by bottom insertion 31 and top insertion 32 inserting in the first hole 112 and second hole 114 respectively so as to be pivotable to engage with the ratchet portion 21, but the pawl 30 only use their distal ends to engage one concavity between two teeth of the ratchet portion 21, so the drive torque is very lower; and 2) the bottom insertion 31 and top insertion 32 of the pawls 30 are in plate shape, so that they are unstable when insert in the first hole 112 and second hole 114.
The present invention intends to provide a ratchet driving device for a ratchet screwdriver to improve the shortcomings of the prior arts mentioned above.
The present invention relates to a ratchet screwdriver and comprises a mounting seat, a fixing ring, a control member, a driving shaft, two pawls, two springs, a fixing ring, a control member, a bead, a positioning spring and a bolt. The mounting seat has a front with a first slot, a second slot, a first extension slot, a second extension slot, a passage, a first hole and a second hole. The driving shaft has a ratchet portion. Each pawl is biased by one spring so as to be engaged with the ratchet portion. The control member is rotatably mounted to the mounting seat and the driving shaft to pivot the pawls to switch to engage or disengage with the ratchet portion.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
Referring to
A circular receiving space 200 is recessed from the central area of the rear end of the driving shaft 20. The receiving space 200 is for receiving the front portion 11 of the mounting seat 10. A ratchet portion 21 is circularly distributed on the inner periphery of the receiving space 200. A pivotal hole 22 is recessed from the bottom of the receiving space 200 and is for pivotably receiving the pivotal portion 14. A screwed hole 24 is recessed from the bottom 23 of the pivotal hole 22. The ratchet portion 21 has multiple teeth and concavities which are located alternatively to the teeth. A function end 25 is defined on the front end of the driving shaft 20, and has a polygonal recess such as a rectangular recess or a hexagonal recess, or has a polygonal rod such as square rod, so as to be connected with a driving member, a bolt, a nut, a socket or a connection rod.
Two pawls 30 are respectively located in the first and second slots 111, 114 and are located symmetrically in opposite directions to each other with respect to the mounting seat 10. One front end of each pawl 30 has an engaging portion 31 with multiple teeth for engaging with the teeth of the ratchet portion 21. Each pawl 30 has a cylindrical pivot 32 with two ends protruding from two lateral sides of the rear end of each pawl 30. The rear end of each pawl 30 extends a contact portion 33. The cylindrical pivots 32 of the pawls 30 in the first and second slots 111, 114 are respectively pivotably inserted into the first and second holes 112, 115, so that the two pawls 30 are rotatable to engage with the teeth of the ratchet portion 21 by their teeth. The engaging portions 31 of the two pawls 30 are respectively located in the first and second slots 111, 114, and the contact portions 33 of the two pawls 30 are respectively located in the first and second extension slot 113, 116. Therefore, the driving shaft 20 is driven to rotate counter clockwise or clockwise by rotating the mounting seat 10 by the engagement between the teeth of the engaging portion 31 of the pawls 30 in the first and second slots 111, 114 and the teeth of the ratchet portion 21 of the driving shaft 20.
Two springs 40 are respectively located in the first and second slots 111, 114 and provide elastic forces to pivot the two pawls 30 to engage with the teeth of the ratchet portion 21 by the teeth of their engaging portions 31. The spring 40 in the first slot 111 is biased between the inside of the first slot 111 and one pawl 30 corresponding thereto, and the spring 40 in the second slot 114 is biased between the inside of the second slot 114 and the other pawl 30 corresponding thereto. By the force from the springs 40, the teeth of the engaging portions 31 of the two pawls 30 are pivoted and engaged with the teeth of the ratchet portion 21. Two recessed holes 1110, 1140 are defined on lateral sides of the first and second slots 111, 114 for receiving one end of the two springs 40 respectively.
The fixing ring 50 is a ring-shaped member having one through hole 52 at central area, two apertures 51 and one positioning hole 53. The fixing ring 50 is connected to the front side of the mounting seat 10 and is fixedly mounted on the pivotal portion 14. The other ends of the cylindrical pivots 32 of the two pawls 30 are pivotably inserted into the two apertures 51. The positioning hole 53 is engaged with the fixing rod 15, so that the fixing ring 50 can't rotate with respect to the mounting seat 10.
The ring shaped control member 60 with an outer periphery defined multiple teeth 600 thereon is rotatably mounted on the outer periphery of the front portion 11 of the mounting seat 10 and has a mounting hole 61 defined therethrough. A circular flange 100 protrudes from the outer periphery of the rear end of the front portion 11. The control member 60 is limited between the circular flange 100 and the rear end of the driving shaft 20 so that he control member 60 can't be apart from the mounting sear 10. A push portion 63 extends from one side of the inner wall of the inner space 62 of the mounting hole 61, and the distal portion of the push portion 63 inserts into the recessed slot 16. When the control member 60 is rotated counter clockwise with respect to the mounting seat 10, the push portion 63 pivots the contact portion 33 of one pawl 30 in the first slot 111 to compress the spring 40 and remove the teeth of engaging portion 31 of the pawl 30 in the first slot 111 from the teeth of the ratchet portion 21, so that the driving shaft 20 is freely rotated clockwise relative to the mounting seat 10. When the control member 60 is rotated clockwise with respect to the mounting seat 10, the push portion 63 pivots the contact portion 33 of one pawl 30 in the second slot 114 to compress the spring 40 and remove the teeth of engaging portion 31 of the pawl 30 in the second slot 114 from the teeth of the ratchet portion 21, so that the driving shaft 20 is freely rotated counter clockwise relative to the mounting seat 10.
Another side of the inner wall of the inner space 62 of the mounting hole 61 of the control member 60 opposite to the push portion 63 has three positioning slots 64 defined therein. The push portion 63 is movable in the recessed slot 16. When the control member 60 is rotated clockwise with respect to the mounting seat 10 and from a second position to a first position, the push portion 63 contacts one end of the recessed slot 16 and pivots the pawl 30 in the second slot 114 to compress the spring 40, and remove the teeth of the engaging portion 31 of one pawl 30 in the second slot 114 from the teeth of the ratchet portion 21, so that the driving shaft 20 is freely rotated counter clockwise relative to the mounting seat 10. When the control member 60 is rotated counter clockwise with respect to the mounting seat 10 and from the second position to a third position, the push portion 63 contacts another end of the recessed slot 16 and pivots the pawl 30 in the first slot 111 to compress the spring 40, and removes the teeth of the engaging portion 31 of the pawl 30 in the first slot 111 from the teeth of the ratchet portion 21, so that the driving shaft 20 is freely rotated clockwise relative to the mounting seat 10. When the control member 60 is at the second position with respect to the mounting seat 10, the teeth of the engaging portion 31 of the two pawls 30 engage with the teeth of the ratchet portion 21, so that the driving shaft 20 is rotatable clockwise and counter clockwise together with the mounting seat 10. The bead 70 is axially and movably located in the reception hole 13. The positioning spring 71 is located in the reception hole 13 and biases the bead 70 outward to be engaged with one of the three positioning slots 64, so as to position the control member 60 at the first position where the driving shaft 20 is freely rotated counter clockwise, the second position where the driving shaft 20 cannot rotate freely, and the third position where the driving shaft 20 is freely rotated clockwise.
The bolt 80 is inserted into the passage 12 and screwed with the screwed hole 24 of the driving shaft 20 by its screwed portion 81, so as to restrict the driving shaft 20 from being separated from the mounting seat 10. A contact face 82 is defined on rear end of the screwed portion 81 is for contacting with the bottom 23 of the pivotal hole 22. The distal end of the pivotal portion 14 contacts the bottom 23 of the pivotal hole 22.
As shown in
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The advantages of the present invention are as followings:
1. the two pawls 30 received in the first and second slots 111, 114 each is pressed by an elastic force of one spring 40 and has an engaging portions 31 with multiple teeth at lateral side, so that the engaging portions 31 engage with the ratchet portion 21 by multiple teeth, and so that the screwdriver has more effective driving torque;
2. the two pawls 30 have cylindrical pivots 32 pivotably inserted into the first and second holes 112, 115, and apertures 51 of the fixing ring 50, so that the two pawls 30, the fixing ring 50 and the mounting seat 10 are mounted stably;
3. The pivotal portion 14 inserts into the pivotal hole 22 and the through hole 52, and the fixing ring 50 is pivotally received in the receiving space 200, and
4. The bolt 80 is inserted into the passage 12 and screwed with the screwed hole 24 of the driving shaft 20 by its screwed portion 81.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
| Number | Name | Date | Kind |
|---|---|---|---|
| 6260446 | Hu | Jul 2001 | B1 |
| 6523439 | Huang | Feb 2003 | B1 |
| 6817458 | Gauthier | Nov 2004 | B1 |
| 7066054 | Liu | Jun 2006 | B2 |
| Number | Date | Country | |
|---|---|---|---|
| 20190134790 A1 | May 2019 | US |
