Patent Application
20060027050
The present invention relates to ratchet spanner, and particular to a ratchet control structure of a ratchet spanner, wherein the ratchet control structure has a switch unit which includes a control element. When adjusting the switch unit, a positioning rod is moved to drive the braking block so as to adjust the rotation direction of the spanner.
In the prior art bi-directional ratchet spanner has a head and a handle. The head and handle are formed with respective recesses. A braking block is received in the recess of the head and a wing portion of a switch unit is received in the recess of the handle. A lower end of the wing portion is formed with a positioning block. One end of the positioning block is received in a groove of the braking block. By moving the switch unit, the positioning block is driven so as to drive the braking block and thus the direction of the ratchet can be changed.
In the prior art the recess is small and thus the switch unit is also small so that the whole spanner has a strong structure. As a result the user must apply a great force to move the switch unit so that the user's fingers will feel ache.
In another improvement, the head and handle are formed with respective recesses. The head is formed with a via hole for receiving a post-like direction change switch. The switch is formed with a trumpet groove. A thicken driving block can be buckled in the groove so as to change the direction of the braking block and ratchet.
However, above mentioned prior art has the following disadvantages.
The switch unit is thick so as to weaken the structure. Thereby, the groove makes the strength of the head decrease dramatically. Thus, it is not suitable to rotate a rusted screwing element.
Moreover, the post-like direction change switch and the driving block are separated. However, if the manufacturing errors will cause that the operation cannot be performed accurately. Moreover, the trumpet like groove and the recess will make the manufacturing process becomes complicated. Finally, as the above mentioned spanner, the recesses are formed at weak portions of the structure so that the structure is further weakened.
Accordingly, the primary object of the present invention is to provide a ratchet control structure, wherein the ratchet control structure has a switch unit which includes a control element. When adjusting the switch unit, a positioning rod is moved to drive the braking block so as to adjust the rotation direction of the spanner.
To achieve above objects, the present invention provides A ratchet control structure comprises a first receiving portion for receiving a ratchet; a second receiving portion for receiving a braking block; and a third receiving portion for receiving a switch unit. The wall of the third receiving portion has a first trench and a second trench. One end of the switch unit in the third receiving portion is formed with a concave portion and a through hole. The concave portion receives one end of a positioning rod. Another end of the positioning rod is received in a sliding trench of the braking block; and a control element is received in the through hole. By moving the switch unit, the positioning rod and control element will control the rotation direction of the ratchet. The conductive wire includes a steel ball, a spring and a top rod.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.
With reference to
A head portion 10 has a first receiving portion 11, a second receiving portion 20 and a third receiving portion 30. The first receiving portion 11 serves to receive a ratchet unit 12. The ratchet unit 12 includes a ratchet 121 and a C ring 123. When the ratchet 121 is received in the first receiving portion 11, the C ring 123 is installed to an edge 122 of the ratchet 121 so that when the ratchet 121 is received in the first receiving portion 11, the ratchet can rotate stable.
The second receiving portion 20 is communicable with the first receiving portion 11 and third receiving portion 30. A braking block 21 is received within the second receiving portion 20. The braking block 21 has a cambered shape. A top center of the braking block 21 is formed with a sliding trench 211 for receiving one end of a positioning rod 32. A surface of the braking block 21 without ratchet teeth is formed with a concave section (not shown) for resisting against a control element 33. Furthermore, the second receiving portion 20 has a sufficient space for sliding the braking block 21 so that the braking block 21 can selectively buckle the ratchet 121 for changing the direction of spanner.
The third receiving portion 30 serves for receiving a switch unit 31. The switch unit 31 has a concave portion 311 and a through hole 312. The concave portion 311 serves to receive another end of the positioning rod 32 so as to prevent the braking block 21 to vibrate to separate from the third receiving portion 30.
The switch unit 31 of the third receiving portion 30 receives a control element 33 for changing direction. The control element 33 includes a steel ball 333, a connecting spring 332 and a ballet like top rod 331. By the control element 33 in the through hole 312, the positioning rod 32 can drive the braking block 21 to change direction.
Furthermore, one lateral wall of the third receiving portion 30 is formed with a first trench 301 and a second trench 302 for receiving the steel ball 333 in the through hole 312 of the switch unit 31 as the switch unit 31 is in change direction operation so as to enhance the engagement of the braking block 21 and the ratchet 121.
With reference to
Thereby, by above design of the switch unit 31, a large stress from manual operation will be avoided. Meanwhile, the third receiving portion 30 for receiving the switch unit 31 is installed at a head portion 10 instead being at the connection of the head portion 10 and handle. Thereby, it does not destroy the structure of the spanner.
Referring to
The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
