Patent Application
20050217103
The present invention relates to a method for twisting a handle of a hand tool and a device for proceeding the twisting the handle.
A conventional method for manufacturing a handle of a hand tool generally includes steps of forging, annealing, machining, polishing, vibrating and electroplating. The conventional method is designed to manufacture a handle that is a straight handle which includes two wide surfaces and two narrow surfaces. The wide surfaces are located parallel to the function ends such as the box end connected to an end of the handle. However, it is noted that when using the handle, the user's fingers are suffered by high pressure from the narrow surfaces, because the direction of rotation of the handle is perpendicular to the narrow surfaces. A twisted handle is developed that is twisted at an intermediate point so that the user's palm holds the wide surfaces when rotating the handle. The conventional method lacks of a step of twisting so that the percentage of defectiveness cannot be reduced.
The present invention intends to provide a method and device for manufacturing a twisted handle.
The present invention relates to a method for manufacturing a twisted handle of a hand tool, and includes a step of forging a handle; a step of annealing the handle; a step of machining the handle to have a full scale; a step of polishing the handle in step 3; a step of twisting the handle in step 4 to include two sections which are connected co-axially and oriented by an angle of 90 degrees; a step of secondary polishing a twisted area of the handle in step 5; a step of proceeding a heat treatment to the handle in step 6; a step of vibrating the handle in step 7 to obtain a fine surface of the handle, and a step of electroplating the handle in step 8.
The device for twisting the handle includes a clamping unit for clamping an end of the handle and a rotating unit for holding the handle. The holding unit includes a holding member having a slot so as to receive the handle, and a positioning member extending in the holding member and contacts the handle. A driving unit has a shaft which is connected to the holding member which is rotated by the driving unit.
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.
The method for manufacturing a twisted handle 40 of a hand tool as shown in
Step 3 of the method may include a process by putting the handle in a rotating bucket and small particles in the bucket impact the surface of the handle so as to remove surplus or a layer of carbon. The handle is then machined to be stretched to have the full scale.
The twisting device for manufacturing the twisted handle 40 comprises a clamping unit 10 which comprises a fixed jaw 11 and a movable jaw 12 which is moved by a first hydraulic cylinder 121. Each of the fixed jaw 11 and the movable jaw 12 has a pad 13 to prevent from damaging the handle 40 that is clamped between the fixed jaw 11 and the movable jaw 12. A rotating unit 30 comprises a holding member 31 having a slot 311 defined therein and the handle 40 is received in the slot 311. A positioning member 313 extends in the holding member 31 and contacts the handle 40. The positioning member 313 is connected to a second hydraulic cylinder 312. A driving unit 33 has a shaft 32 which is connected to the holding member 31 and the shaft 32 is rotated by the driving unit 33. A stop member 20 is located beside the clamping unit 10 and contacts an end of the handle 40. It is noted that the stop member 20 is movably connected to two rails 21 and connected to a hydraulic cylinder 211. The stop member 20 is moved on the two rails 21 so that the different lengths of handles 40 can be used.
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.
