Hand tools abstract
The present invention relates to a structural improvement for power
cords of hand tools. Part of the power cord forms itself into several
coils, allowing a shaping cable to penetrate through and be fastened
to the two opposite ends of the coils. Since the shaping cable does
not have any elasticity, it prevents the coils from loss of elastic
deformation after frequent pulling. Especially for the place where
the power cord connects to the hand tools or appliances, the power
cord forms itself into several coils, through which a shaping cable
penetrates. The shaping cable does not have any elasticity, so it
shapes the coils firmly and allows the coils to maintain a constant
radius. As a result, the breakage problem with the power cord due
to single-point bending is solved through such coils that the bending
point is delocalized with reduced bending angle and shifts with
the swinging direction.
Hand tools claims
What is claimed is:
1. A structural improvement to extend life for a power cord of
hand tools, having coils at a place where said power cord connects
to said hand tool, characterized in that: there are several coils
at said power cord to allow a shaping cable to penetrate through
and be fastened to said power cord; said shaping cable has no elasticity
and is fixed to a front and a rear of said coils to prevent said
coils from deformation and loss of elastic bending, and through
said coils, a bending point is delocalized and shifts along with
a swing direction of said hand tool.
Hand tools description
FIELD OF THE INVENTION
 The present invention relates to an improved structural
design of the power cord, which may be applied to various small
electromechanical devices such as band tools, hair blowers and portable
electric drills, especially to strengthen the structure where the
power cord meets the devices in a bending form and to enhance the
anti-bending property for the power cord.
BACKGROUND OF THE INVENTION
 As shown in FIG. 1 the traditional power cord 1' is designed
to be linear. When users need to swing the hand tool constantly
in different directions (like the hair blower used by a designer),
bending occurs at the same point. Such single-point bending causes
the conducting wires inside the power cord susceptible to breakage
due to a large bending angle for the linear power cord 1'.
 In FIG. 2 although the coiled power cord 2' can solve the
above-mentioned single-point bending problem, it can not maintain
a constant coiling after frequent pulling action during a long time
use. Therefore it deforms and is also susceptible to single-point
 In view of such a breakage problem for traditional power
cords, the inventor of the present invention was devoted to finding
a solution and accomplished structural improvement for power cord.
SUMMARY OF THE INVENTION
 The main objective for the present invention is to solve
the breakage problem due to single-point bending by the power cord
forming itself into several coils at the place where the power cord
connects to the hand tools or appliances, installing a shaping cable
penetrating through the coils, fastening the shaping cable at the
two opposite ends of the curve part, shaping the coils effectively
with the rigid characteristic of the cable, maintaining the coils
in constant radius, delocalizing the bending point subject to frequent
bending, and finally shifting the bending point along with the swing
 In the following, the embodiment illustrated is used to
describe the detailed structural characteristics and operation action
for the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
 FIG. 1 is a three-dimensional illustration for single-point
bending in a traditional linear power cord.
 FIG. 2 is a three-dimensional illustration for deformation
in a traditional coiled power cord.
 FIG. 3 is a three-dimensional illustration for the power
cord in the present invention.
 FIG. 4 is a three-dimensional illustration for the shaping
cable in the present invention.
 FIG. 5 is a three-dimensional illustration for application
of the present invention to a hair blower.
 FIG. 6 is an illustration for bending of the power cord
in the present invention.
DETAILED DESCRIPTION OF THE INVENTION
 Please refer to FIGS. 3 to 5. The power cord 1 connects
to the bottom of the handle of a hand tool or small appliance. A
trumpet-like protective cover 3 is added to the connection place
of the power cord 1 and the hand tool. The trumpet-like protective
cover may encompass one or two coils of the power cord.
 The power cord 1 forms itself into several coils 11 at the
rear of the trumpet-like protective cover 3. The coils 11 include
one or two coils inside the trumpet-like protective cover 3 so
each bending angle is delocalized as the power cord is bent.
 A shaping cable 2 penetrates through the coils 11 of the
power cord 1. The shaping cable 2 has a fixed length, but does not
have any elasticity. At the rear of the coils 11 and the trumpet-like
protective cover 3 respectively, the shaping cable 2 is fastened
to the power cord by fasteners 21.
 Please refer to FIGS. 3 and 6. Since the shaping cable 2
does not any elasticity, it provides elastic bending when it is
fixed to the front and the rear of the coils 11. Restricted by the
shaping cable 2 the coils 11 can maintain elastic bending and allows
effective delocalization of the bending point into several places
when the power cord 1 is bent again. The original bending angle
from 90 degree to 180 degree can be changed to several angels in
smaller degree. As shown in FIG. 6 due to restriction of the shaping
cable 2 in the present invention, each bending angle for the coils
11 becomes smaller. Besides, the bending point shifts with the swinging
direction. As a result, the life of the power cord is extended.
 To summarize the above description, the power cord in the
present invention can provide effective performance and extend its
life through a simple structural improvement, which practically
meets the qualifications for invention based on new type and improvement.
Accordingly, an application is submitted for examination.