U.S. patent application number 11/027875 was filed with the patent office on 2005-05-19 for method for making a wrench.
Invention is credited to Hu, Bobby.
Application Number | 20050102810 11/027875 |
Document ID | / |
Family ID | 34576083 |
Filed Date | 2005-05-19 |
United States Patent
Application |
20050102810 |
Kind Code |
A1 |
Hu, Bobby |
May 19, 2005 |
Method for making a wrench
Abstract
A method for manufacturing a wrench having a hollow handle
includes preparing a head having an engaging portion, necking an
end of a metal tubular member, closing another end of the metal
tubular member, and fusing the end of the metal tubular member and
the head together, forming a wrench having a hollow handle. The
step of fusing may be performed before the step of closing. The
method may further include a step of proceeding at least one of
grinding, patching, and polishing an outer periphery of the hollow
handle. Next, the hollow handle may be heat processed to improve
the strength and hardness of the tubular member. Then, the surface
of the tubular member may be finished.
Inventors: |
Hu, Bobby; (Taichung,
TW) |
Correspondence
Address: |
NIKOLAI & MERSEREAU, P.A.
900 SECOND AVENUE SOUTH
SUITE 820
MINNEAPOLIS
MN
55402
US
|
Family ID: |
34576083 |
Appl. No.: |
11/027875 |
Filed: |
December 28, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
11027875 |
Dec 28, 2004 |
|
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|
10623903 |
Jul 21, 2003 |
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Current U.S.
Class: |
29/90.01 ;
29/428 |
Current CPC
Class: |
B25G 1/10 20130101; B25B
13/461 20130101; B25G 1/105 20130101; Y10T 29/49826 20150115; Y10T
29/47 20150115 |
Class at
Publication: |
029/090.01 ;
029/428 |
International
Class: |
B21C 037/30; B24B
039/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 5, 2002 |
TW |
91117728 |
Claims
What is claimed is:
1. A method for manufacturing a wrench having a hollow handle,
comprising: preparing a head having an engaging portion; necking an
end of a metal tubular member; closing another end of the metal
tubular member; and fusing the end of the metal tubular member and
the head together, forming a wrench having a hollow handle.
2. The method as claimed in claim 1, wherein the step of fusing is
performed before the step of closing.
3. The method as claimed in claim 1, wherein the step of necking is
performed before the step of closing and the step of fusing.
4. The method as claimed in claim 1, further including a step of
proceeding at least one of grinding, patching, and polishing an
outer periphery of the hollow handle.
5. The method as claimed in claim 4, further including a step of
heat processing the hollow handle after the step proceeding at
least one of grinding, patching, and polishing an outer periphery
of the hollow handle.
6. The method as claimed in claim 5, further including a step of
surface finishing the hollow handle after the step of heat
processing.
7. The method as claimed in claim 6, wherein the step of surface
finishing includes at least one of oscillation, sanding,
blackening, and electro deposition.
8. The method as claimed in claim 2, further including a step of
proceeding at least one of grinding, patching, and polishing an
outer periphery of the hollow handle.
9. The method as claimed in claim 8, further including a step of
heat processing the hollow handle after the step proceeding at
least one of grinding, patching, and polishing an outer periphery
of the hollow handle.
10. The method as claimed in claim 9, further including a step of
surface finishing the hollow handle after the step of heat
processing.
11. The method as claimed in claim 10, wherein the step of surface
finishing includes at least one of oscillation, sanding,
blackening, and electro deposition.
12. The method as claimed in claim 3, further including a step of
proceeding at least one of grinding, patching, and polishing an
outer periphery of the hollow handle.
13. The method as claimed in claim 12, further including a step of
heat processing the hollow handle after the step proceeding at
least one of grinding, patching, and polishing an outer periphery
of the hollow handle.
14. The method as claimed in claim 13, further including a step of
surface finishing the hollow handle after the step of heat
processing.
15. The method as claimed in claim 14, wherein the step of surface
finishing includes at least one of oscillation, sanding,
blackening, and electro deposition.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a method for making a
wrench.
[0003] 2. Description of the Related Art
[0004] Ratchet wrenches have been widely used for
tightening/loosening fasteners with or without the use of sockets.
The handle of a typical ratchet wrench is formed by means of
carrying out a "forge hot" process on a solid iron raw material,
resulting in a solid weighty structure that is a burden to the
user, which is particularly true for a large size handle. Further,
stress concentration occurs easily during the forging process of
the solid handle of iron, providing a weaker structure incapable of
withstanding higher bending moment. Further, the manufacture cost
of the solid handle requiring a large amount of material is
relatively high, and the stock cost is expensive, as at least
twenty thousands of pieces are required for each mold for forging
the solid handles.
[0005] An example of forming a solid handle of a ratchet wrench is
disclosed in, e.g., Taiwan Patent Publication No. 153538, in which
a plate is process to form a wrench having a solid handle, a head
with a hole, and a necked portion. Another conventional method for
manufacturing a wrench includes directly forging a wrench having a
solid handle and a head. As mentioned above, the cost is increased,
and the overall weight is relatively large, causing a burden to the
user. Further, it was found that the maximum torque-bearing
capacity of a solid rod is smaller than that for a hollow tube.
Thus, the present invention is intended to provide a method for
manufacturing a wrench having a hollow handle for
mitigating/obviating the above problems.
SUMMARY OF THE INVENTION
[0006] A method for manufacturing a wrench having a hollow handle
in accordance with the present invention generally includes
preparing a head having an engaging portion, necking an end of a
metal tubular member, closing another end of the metal tubular
member, and fusing the end of the metal tubular member and the head
together, forming a wrench having a hollow handle.
[0007] The step of fusing may be performed before the step of
closing. The step of necking is preferably performed before the
step of closing and the step of fusing. The method may further
include a step of proceeding at least one of grinding, patching,
and polishing an outer periphery of the hollow handle. Next, the
hollow handle may be heat processed to improve the strength and
hardness of the tubular member. Then, the surface of the tubular
member may be finished.
[0008] The overall weight of the wrench thus manufactured is
relatively small when compared with a wrench having a solid handle.
The burden to the user operating the wrench for a relatively long
period of time is greatly reduced, and the working efficiency is
improved. Further, the impact-resistance, toughness, and strength
of the wrench having a hollow handle are improved.
[0009] Other objects, advantages, and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a flowchart illustrating a method for
manufacturing a wrench in accordance with the present
invention.
[0011] FIGS. 2A through 2E are views illustrating manufacture of a
wrench by the method shown in FIG. 1.
[0012] FIG. 3 is a perspective view of a wrench manufactured by the
method in accordance with the present invention.
[0013] FIG. 4 is a flowchart illustrating a modified embodiment of
the method for manufacturing a wrench in accordance with the
present invention.
[0014] FIGS. 5A through 5E are views illustrating manufacture of a
wrench by the method shown in FIG. 4.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] A method for manufacturing a wrench in accordance with the
present invention generally comprises: preparing a head having an
engaging portion, necking an end of a metal tubular member, closing
the other end of the metal tubular member, fusing the end of the
metal tubular member and the head together. The step of closing and
the step of fusing can be exchanged, namely, the step of fusing can
be performed before the step of closing.
[0016] Referring to FIGS. 1 and 2A-2E, in an embodiment of the
invention, a method for manufacturing a wrench in accordance with
the present invention comprises: preparing a head 20 having an
engaging portion 21 (step 100 and FIG. 2A), necking an end 11 of a
metal tubular member 10 that has a hollow interior 13 (step 102 and
FIG. 2B), closing the other end 12 of the metal tubular member 10
(step 104 and FIG. 2C), fusing the end 11 of the metal tubular
member 10 and the head 20 together (step 106 and FIG. 2D),
grinding, patching, and polishing an outer periphery of the tubular
member 10 to provide a smooth surface (step 108), heat processing
the tubular member 10 to realign inner molecules of the tubular
member 10, rendering a uniform hardness in the bending portions,
joint portions, and the remaining portions of the tubular member 10
and thus providing improved strength and hardness for the tubular
member 10 (step 110), and surface finishing the tubular member 10
(step 112 and FIG. 2E). The surface finishing process includes
oscillation, sanding, blackening, and/or electro deposition.
[0017] Referring to FIGS. 4 and 5A-5E, in another embodiment of the
invention, a method for manufacturing a wrench in accordance with
the present invention comprises: preparing a head 20 having an
engaging portion 21 (step 200 and FIG. 5A), necking an end 11 of a
metal tubular member 10 that has a hollow interior 13 (step 202 and
FIG. 5B), fusing the end 11 of the metal tubular member 10 and the
head 20 together (step 204 and FIG. 2C), closing the other end 12
of the metal tubular member 10 (step 206 and FIG. 2D), grinding,
patching, and polishing an outer periphery of the tubular member 10
to provide a smooth surface (step 208), heat processing the tubular
member 10 to realign inner molecules of the tubular member 10,
rendering a uniform hardness in the bending portions, joint
portions, and the remaining portions of the tubular member 10 and
thus providing improved strength and hardness for the tubular
member 10 (step 210), and surface finishing the tubular member 10
(step 212 and FIG. 5E). The surface finishing process includes
oscillation, sanding, blackening, and/or electro deposition.
[0018] FIG. 3 is a perspective view of the wrench manufactured in
accordance with the method of the invention. The overall weight of
the wrench is relatively small when compared with a wrench having a
solid handle. The burden to the user operating the wrench for a
relatively long period of time is greatly reduced, and the working
efficiency is improved regardless of the age and sex of the user.
Further, it was found that the impact-resistance, toughness, and
strength of the wrench having a hollow handle were better than
those of a wrench having a solid handle while reducing the
manufacture cost of the wrench.
[0019] Although the invention has been explained in relation to its
preferred embodiment, it is to be understood that many other
possible modifications and variations can be made without departing
from the scope of the invention as hereinafter claimed.
* * * * *