[0001] This application claims priority to Japanese patent application serial number 2001-319277.
[0002] The present invention relates to power tools and, more particularly, to techniques
for either fixedly or removably attaching a power cord to a common housing for a power
tool.
[0003] Power tools are usually connected to an electric power source (commercial power outlet)
via a power cord. The power cord may be fixedly attached to the housing of the power
tool or may be removably attached to the housing of the power tool. US Patent No.
6,368,133 describes a removable power cord that is inserted into a receiving hole
provided within the housing of the power tool. A connection terminal for the power
tool is disposed within the receiving hole. The shape of the connection end of the
power cord is complementary to the shape of the receiving hole of the housing, and
a connection terminal is provided for the power cord. Thus, in order to connect the
power cord to the power tool, the connection end of the power cord is inserted into
the receiving hole of the housing. Upon inserting the power cord into the receiving
hole, the connection terminal of the power tool is electrically connected to the connection
terminal of the power cord.
[0004] However, according to US Patent No. 6,368,133, the design of the power tool housing
that will be attached to a removable power cord must be different from the design
of the power tool housing that will be attached to a fixedly attached power cord,
because the receiving hole must be provided within the housing for the known removably
attachable power cord. Consequently, two different molds are required to manufacture
housings for the power tool. That is, one mold must define a first power tool housing
for receiving a fixedly attached power cord and the second mold must define a second
power tool housing for receiving the removably attached power cord. Thus, according
to the known art, the first power tool housing can not be utilized interchangeably
with the second power tool housing.
[0005] It is, accordingly one object of the present teachings to overcome such problems
and to teach techniques for enabling either a removable power cord or a fixed power
cord to be connected to a common power tool housing.
[0006] In one aspect of the present teachings, power tools may include a motor that is disposed
within a housing. The motor may be arranged and constructed to drive a tool or a tool
bit. The housing is preferably defined so as to be capable of receiving either a fixedly
attached power cord or a removably attachable power cord without requiring any changes
to the housing. For example, a fitting recess (e.g., a common fitting recess) may
be defined within the housing and the fitting recess is preferably designed so as
to receive either an adapter (or connector) for a removable power cord or a cord guard
for a fixedly secured power cord. Thus, if a fixedly secured power cord will be attached
to the housing, the cord guard fitting portion may be disposed within the common fitting
recess and no changes to the housing (e.g., the common housing) are necessary.
[0007] If a removable power cord will be attached to the housing (e.g., the common housing),
an adapter (or connector) may be coupled to the motor and may be attached to the housing.
For example, an adapter fitting portion (e.g., a flange) may be defined on the adapter
and may be disposed within the fitting recess (e.g., the common fitting recess) of
the housing. The adapter also may include a connector fitting portion (e.g., an insert
or socket). Further, a receiving hole for the removable power cord may be defined
within the connector fitting portion. The connector fitting portion is preferably
disposed outside of (external to) the housing when the adapter is attached to the
housing. The removable power cord may include a cord fitting portion (e.g., a plug),
such as a connection end of the power cord. The cord fitting portion (e.g., plug)
preferably fits into or engages with the connector fitting portion (e.g., socket).
By fitting the cord fitting portion into the connector fitting portion, the power
cord may be removably connected to the connector.
[0008] In such power tools, the removable power cord may be connected to the connector fitting
portion, which is attached to the housing. Because the connector fitting portion may
be disposed outside the housing, the housing is not required to contain a mechanism
or device for connecting to the removable power cord. Therefore, if the adapter is
arranged and constructed to engage a housing that is designed for a fixedly attached
power cord, a common housing can accommodate both a fixedly attachable power cord
and a removably attachable power cord. Therefore, a single housing can be manufactured
for each of these applications of the power tool.
[0009] At least one of the connector fitting portion and the cord fitting portion preferably
may include a receiving hole and the other may include an insertion projection. The
insertion projection is inserted into the receiving hole. The receiving hole preferably
may include one or more projecting terminals and the insertion projection preferably
may also include one or more receiving terminals. The projecting terminal(s) may be
inserted into the receiving terminal(s). If the projecting terminal(s) are provided
within the receiving hole, the projecting terminal(s) will be protected from being
deformed or damaged.
[0010] In another aspect of the present teachings, the receiving hole may be defined within
the connector fitting portion. In this case, the cord fitting portion may include
the insertion projection. The adapter may also include a sleeve that may be secured
to the housing in order to support (e.g., rotatably support) the connector fitting
portion. Further, one (terminal) end of the sleeve may be disposed beyond the corresponding
end of the connector fitting portion. For example, the sleeve may project beyond the
end of the connector fitting portion (i.e., the terminal end of the connector fitting
portion (or insert) is preferably disposed within the interior of the sleeve). A first
projection may be formed on the inner wall of the end of the sleeve. A second (locking)
projection may be formed on (or proximal to) the outer wall of the insertion projection
of the power cord.
[0011] In this case, the cord fitting portion may be first aligned with the connector fitting
portion, so that the insertion projection of the power cord can be inserted into the
receiving hole of the connector fitting portion. For example, the connector fitting
portion may be substantially in a first position relative to the sleeve, so that the
first projection (of the sleeve) does not interfere with the second projection (of
the cord fitting portion of the power cord). Thus, in this first position, the insertion
projection of the power cord can be pulled (removed) from or inserted into the receiving
hole of the connector fitting portion, because the first projection does not interfere
with the second projection in the first position. After inserting the insertion projection
into the receiving hole, the cord fitting portion and the connector fitting portion
may be rotated together about the common rotational axis to (or is disposed in) a
second position with respect to the sleeve. When the cord fitting portion is disposed
in the second position with respect to the sleeve, the first projection will engage
the second projection and/or the first projection (of the sleeve) will prevent the
second projection (of the power cord) from passing the first projection. (For example,
the first and second projections may be disposed in a substantially interlocking position.)
As a result, the insertion projection of the power cord can be prevented from being
pulled out of (removed from) the receiving hole of the connector fitting portion due
to the engagement of the first and second projections. Thus, by engaging the first
projection with the second projection, the power cord can be prevented from accidentally
falling out of the connector fitting portion.
[0012] These aspects and features may be utilized singularly or in combination in order
to provide improved power tools. In addition, other objects, features and advantages
of the present teachings will be readily understood after reading the following detailed
description together with the accompanying claims and drawings, which will be briefly
described below. Of course, the additional features and aspects disclosed herein also
may be utilized singularly or in combination with the above-described aspects and
features.
[0013] Fig. 1 is a side view of a screwdriver according to a representative embodiment of
the present teachings.
[0014] Fig. 2 is a longitudinal cross-sectional view of the bottom portion of a handle.
[0015] Fig. 3 is a cross-sectional view taken along line III - III shown in Fig. 2.
[0016] Fig. 4 is a perspective view of a representative adapter.
[0017] Fig. 5 is a longitudinal cross-sectional view of a representative connector fitting
portion.
[0018] Fig. 6 is a cross-sectional view taken along line VI - VI shown in Fig. 5.
[0019] Fig. 7 is a perspective view of a representative plug.
[0020] Fig. 8 is a side view of the representative screwdriver with a power cord fixedly
attached to the housing.
[0021] In another embodiment of the present teachings, power tools may include a motor (e.g.,
an electric motor) disposed within a housing. The motor preferably may be adapted
to drive the power tool or a tool bit attached to the power tool. An adapter or connector
may be electrically connected to the motor and attached to the housing. The adapter
may include a connector fitting portion that is disposed external to (outside of)
the housing. The connector fitting portion may be defined, e.g., as a socket or insert
for receiving a cord fitting portion of a removable power cord. The cord fitting portion
may be defined, e.g., as a plug that is arranged and constructed to fit within (or
engage with) the connector fitting portion or socket. By fitting the cord fitting
portion (e.g., plug) into the connector fitting portion (e.g., socket), the power
cord can be electrically and removably connected to the adapter.
[0022] In another embodiment, one of the connector fitting portion and the cord fitting
portion may include a receiving hole. The other of the connector fitting portion and
the cord fitting portion may include an insertion projection arranged and constructed
for insertion into the receiving hole. At least one projecting terminal may be disposed
within the receiving hole and at least one receiving terminal may be arranged and
constructed to receive the at least one projecting terminal defined within the insertion
projection. In another embodiment, the receiving hole may be defined within the connector
fitting portion and the insertion projection may be defined within the cord fitting
portion.
[0023] Optionally, the adapter may include a sleeve that supports the connector fitting
portion and the sleeve may be attached to the housing. For example, the sleeve may
be arranged and constructed to rotatably support the connector fitting portion, such
that the connector fitting portion can rotate within the sleeve. One end of the sleeve
may be disposed beyond a corresponding end of the connector fitting portion. First
projections may be defined on an inner wall of the end of the sleeve and second projections
may be defined on an outer wall of the cord fitting portion (e.g., the plug).
[0024] The cord fitting portion can be inserted into the connector fitting portion when
the connector fitting portion is disposed substantially in a first position with respect
to the sleeve. In this first position, the first projections do not interfere with
the second projections, thereby allowing the insertion projection of the power cord
to be pulled (removed) from or inserted into the receiving hole of the connector fitting
portion. Then, when the cord fitting portion is rotated about a common rotational
axis to a second position with respect to the sleeve, the first projections preferably
engage the second projections in order to prevent the insertion projection of the
power cord from being pulled (removed) from the receiving hole of the connector fitting
portion. For example, the second projections may block the first projections from
passing out of the sleeve.
[0025] In another embodiment, a locking mechanism may be utilized to releasably secure the
removable power cord to the sleeve. For example, the locking mechanism may be operated
or manipulated to release the removable power cord from the sleeve when the connector
fitting portion is disposed in the second position with respect to the sleeve. Optionally,
the locking mechanism may include a groove defined in one of the sleeve or the removable
power cord. A locking member may be defined on the other of the sleeve and the removable
power cord. Preferably, the locking member disengages from the groove when the locking
member has been operated or manipulated from its original or initial position and
the locking member engages the groove when the locking member has been released and
returned to its original or initial position. The locking member may be arranged and
constructed such that the locking member is urged toward the locking position and
away from the unlocking position. For example, the locking member may be made of an
elastic resin material that urges the locking member toward the locking position and
away from the unlocking position.
[0026] The locking mechanism may also include one or more stoppers arranged and constructed
to prevent the locking member from dislodging from the groove. Further, the locking
member may be defined on the removable power cord.
[0027] In other optional embodiments, the receiving hole may include a recess and an engaging
projection may be defined on an outer wall of the cord fitting portion (e.g., the
plug). The engaging projection is preferably designed to engage the groove. In addition
or in the alternative, the sleeve may be attached to the housing such that the sleeve
is prevented from rotating with respect to the housing. For example, the adapter fitting
portion of the sleeve may be defined so that the adapter fitting portion can not rotate
or pivot within the fitting recess of the housing.
[0028] Each of the additional features and method steps disclosed above and below may be
utilized separately or in conjunction with other features, elements and method steps
to provide improved power tools. Detailed representative examples of the present teachings,
which examples will be described below, utilize many of these additional features
and method steps in conjunction. However, this detailed description is merely intended
to teach a person of skill in the art further details for practicing preferred aspects
of the present teachings and is not intended to limit the scope of the invention.
Only the claims define the scope of the claimed invention. Therefore, combinations
of features and steps disclosed in the following detailed description may not be necessary
to practice the present teachings in the broadest sense, and are instead taught merely
to particularly describe representative and preferred embodiments of the present teachings,
which will be explained below in further detail with reference to the figures. Of
course, features and steps described in this specification and in the dependent claims
may be combined in ways that are not specifically enumerated in order to obtain other
usual and novel embodiments of the present teachings and the present inventor expressly
contemplates such additional combinations.
[0029] Fig. 1 shows a representative screwdriver 10 according to the present teachings,
in which housing 12 may accommodate motor 11. Tool bit 16 may be mechanically connected
to motor 11 via a transmission mechanism (not shown). A removable power cord 61 may
be electrically coupled to motor 11 via adapter (e.g., connector) 32 and electric
circuit (wire) 13, which may be disposed within housing 12. By connecting power cord
61 to an external power source (e.g., a commercial power outlet), current will be
supplied to motor 11 in order to rotate motor 11 and drive tool bit 16.
[0030] Handle 12a may be defined on a portion of housing 12. Trigger switch 14 may be disposed
on handle 12a and is preferably designed to actuate motor 11. When trigger switch
14 is actuated, current is supplied to motor 11 from the external power source. When
trigger switch 14 is de-activated (released), the supply of current from the external
power source will be stopped. Accordingly, pressing or actuating trigger switch 14
will cause tool bit 16 to rotate and releasing or de-activating trigger switch 14
will cause tool bit 16 to stop rotating.
[0031] Housing 12 may be divided along dividing line 12c into two housing halves 12d, 12e.
By fitting together housing halves 12d, 12e, fitting recess 12b may be defined within
a bottom portion of handle 12a, as shown in Figs. 2 and 3. That is, a first portion
of fitting recess 12b may be defined within housing half 12d and a second portion
of fitting recess 12b may be defined within housing half 12e. Fitting recess 12b may
have, e.g., a substantially square cross-section, although a variety of configurations
are contemplated, as will be discussed further below. Further, fitting recess 12b
is preferably designed so as to receive either adapter fitting portion 33a for removable
power cord 61 or power cord fitting portion 24a of fixedly secured power cord 22,
as will be further discussed below.
[0032] Adapter 32 may be mounted or disposed within fitting recess 12b. As shown in Fig.
2, adapter 32 may include sleeve 33 and insert (e.g., connector fitting portion) 34.
Insert 34 also may be interchangeably referred to as socket 34. Sleeve 33 is preferably
separable from insert 34, although sleeve 33 may be integrally and continuously formed
with insert 34. In the present embodiment, insert 34 can rotate or pivot within sleeve
33, as will be further discussed below.
[0033] Adapter fitting portion 33a may be defined in or on a first terminal end of sleeve
33 (e.g., the top end of sleeve 33, as shown in Fig. 3). Adapter fitting portion 33a
also may have, e.g., a substantially square cross-section, that is substantially complementary
to fitting recess 12b. In addition, adapter fitting portion 33a is preferably arranged
and constructed to fit within (or engage) fitting recess 12b, so that adapter 32 will
not rotate within (or with respect to) the handle 12a when adapter 32 is engaged with
fitting recess 12b. Thus, although adapter fitting portion 33a and fitting recess
12b may preferably have substantially square (complementary) configurations, any complementary
shapes or configurations that will prevent adapter 32 from rotating with respect to
handle 12a may be utilized with the present teachings.
[0034] An aperture may be defined within sleeve 33 from the first terminal end (e.g., the
top end) of sleeve 33 to a second terminal end (e.g., the bottom end) of sleeve 33.
The aperture may include a substantially circular upper opening 33d, a substantially
circular middle opening 33e, which may have a slightly smaller diameter than upper
circular opening 33d, and a substantially circular lower opening 33f, which may have
a larger diameter than the substantially circular middle opening 33e.
[0035] Referring to Fig. 4, two projections 33b may be defined on an inner wall of substantially
circular lower opening 33f of sleeve 33. Projections 33b may be disposed opposite
to each other and project inwardly from the inner wall of the substantially circular
lower opening 33f. Locking groove 33c may be defined on an outer surface of the lower
portion of sleeve 33. Stoppers 33g may be defined on both sides of locking groove
33c and may project from the outer surface of sleeve 33.
[0036] As shown in Figs. 5 and 6, the outer shape of insert 34 may be substantially cylindrical,
such that insert 34 will closely fit within substantially circular upper opening 33d
and substantially circular middle opening 33e. Flange 34a may be defined on an upper
(or first terminal) end of insert 34. Receiving hole 34b may be defined within the
lower (or second terminal) end of insert 34. Receiving hole 34b may preferably extend
perpendicularly (e.g., upwardly) from a lower end face of insert 34. The depth of
receiving hole 34b may be, e.g., approximately one-half the longitudinal length of
insert 34.
[0037] As shown in Fig. 6, the cross-sectional design of receiving hole 34b may include
a combination of arcs and straight lines. Recess 34c may be defined within one of
the two straight inner walls. Two pins (projecting terminals) 35 may be fixed in position
so as to extend or project within receiving hole 34b. One wire 36 may be electrically
coupled to each respective pin 35. The wires 36 may constitute parts of electric circuit
13 and may be fastened to the first terminal end of insert 34.
[0038] Referring back to Fig. 2, insert 34 may be inserted from above into apertures 33d,
33e, which are defined within sleeve 33, so as to be pivotable or rotatable with respect
to sleeve 33 about the rotational (longitudinal) axis of the insert 34. After disposing
insert 34 within sleeve 33, sleeve 33 may be attached to housing 12 by disposing adapter
fitting portion 33a within fitting recess 12b. For example, housing halves 12d, 12e
may be assembled around adapter fitting portion 33a so that the adapter fitting portion
33a is securely disposed within fitting recess 12b.
[0039] As shown in Fig. 3, if adapter fitting portion 33a and fitting recess 12b each have
a square cross-section, sleeve 33 cannot pivot or rotate with respect to housing 12.
However, as noted above, the adapter fitting portion 33a and fitting recess 12b may
have different, but still complementary configurations, that enable adapter fitting
portion 33a to be non-rotatably disposed within fitting recess 12b. A wide variety
of complementary configurations are known in the art and thus need not be specifically
described herein.
[0040] Adapter 32 is preferably designed to receive removable power cord 61. As shown in
Fig. 2, plug (e.g., cord fitting portion) 62 may be coupled to one terminal end of
power cord 61. Referring to Fig. 7, plug 62 may include a substantially cylindrical
lower portion. Plug 62 also may include cylindrical portion 62c disposed adjacent
to the substantially cylindrical lower portion. Insertion projection 62a may be disposed
adjacent to cylindrical portion 62c. Insertion projection 62a preferably may have
an outer shape that is complementary with receiving hole 34b of insert 34. Engaging
projection 62d may be defined along one of the straight extending peripheral walls
of insertion projection 62a.
[0041] Two terminal holes 66 may be defined within an upper end of insertion projection
62a. Cylindrical terminals 66a may be respectively disposed within terminal holes
66. Cylindrical terminals 66a may be electrically connected to cord 67, which extends
from the substantially cylindrical lower portion of plug 62. Two locking projections
62b may project outwardly from cylindrical portion 62c of plug 62. Preferably, locking
projections 62b may be symmetrically disposed about the center of cylindrical portion
62c. A power-source plug (not shown) for insertion into a commercial power outlet
(or power socket) may be connected to the terminal end of cord 67.
[0042] Referring to Figs. 2 and 7, plug 62 may also include locking member 64, which may
be an elastic resin body. The lower (or first terminal) end of locking member 64 may
be coupled to affixing portion 68. Locking portion 64a may be defined on the upper
portion of locking member 64. When locking portion 64a is pressed in the direction
of arrow 64b shown in Fig. 2, locking member 64 will deform as shown by broken lines
in Fig. 2 to an "unlocked" position. Consequently, locking member 64a will move obliquely
downward. When the pressing force is removed or released from locking portion 64a,
locking member 64 will return to its initial or original position, i.e., a "locked"
position, due to the elastic restoring force of the elastic resin body.
[0043] A representative method for coupling plug 62 to adapter 32 will now be described.
First, insertion projection 62a of plug 62 may be inserted into receiving hole 34b
of insert 34 when the insert 34 is disposed substantially in a first position with
respect to the sleeve 33. This insertion operation may be accomplished by moving plug
62 toward adapter 32 in a manner so that projections 33b of sleeve 33 do not interfere
with locking projections 62b of plug 62. That is, in the first position, projections
33b do not interfere or engage locking projections 62b. Upon inserting plug 62 into
adapter 32, pins 35 will be respectively inserted into cylindrical terminals 66a of
terminal holes 66. For example, the shape of recess 34c of insert 34 is preferably
complementary to the shape of engaging projection 62d so that insertion projection
62a can be inserted into receiving hole 34b. Due to the complementary shapes of engaging
projection 62d and receiving hole 34b, plug 62 can be inserted into insert 34 only
in one particular orientation, which will be referred to as the "first" or "insertion"
orientation.
[0044] In addition, in order to prevent locking portion 64a from interfering with the bottom
of sleeve 33 when plug 62 is inserted into adapter 32, locking member 64 should be
pressed, e.g., manually pressed, into the unlocked position.
[0045] Next, plug 62 is rotated approximately 90 degrees from the first or insertion orientation
to a second position while keeping plug 62 completely inserted within adapter 32.
As a result, locking projections 62b of plug 62 will contact the rear portions of
projections 33b of sleeve 33 and plug 62 will be prevented from falling out of (or
being removed from) adapter 32 when plug 62 is disposed substantially in the second
position with respect to sleeve 33.
[0046] Further, in this condition, locking groove 33c of sleeve 33 coincides with locking
member 64 in the circumferential direction. Therefore, when the pressing force applied
to locking member 64 is removed or released, locking member 64 will return to the
locking position due to its elastic restoring force. Therefore, locking portion 64a
fits into (engages) locking groove 33c. Because locking portion 64a is fitted into
(engaged with) locking groove 33c, plug 62 is prevented from pivoting about its longitudinal
axis with respect to insert 34. Further, if stoppers 33g are defined on both sides
of locking groove 33c, locking portion 64a can be prevented from dislodging from locking
groove 33c.
[0047] Projections 33b of adapter 32 respectively engage locking projections 62b of plug
62. Further, locking portion 64a fits within (engages) locking groove 33c. Therefore,
plug 62 is prevented from moving both along and around its longitudinal axis and plug
62 is positively, but releasably, secured to adapter 32.
[0048] In order to disconnect plug 62 from adapter 32, locking member 64 may be deformed
(e.g., manually pressed), thereby forcing locking portion 64a out of locking groove
33c. By rotating plug 62 around its longitudinal axis to the first or insertion orientation
while continually pressing locking member 64 and then by pulling plug 62 in the axial
direction, plug 62 can be disconnected (removed) from adapter 32.
[0049] The connection/disconnection of plug 62 to/from adapter 32 can be accomplished by
a series of actions, such as inserting and rotating (or pivoting) plug 62 and operating
locking member 64. These actions may be manually performed with one hand, thereby
enabling "one-touch" operation. Therefore, by using the above-described adapter 32
and plug 62, connection and removal of the removable power cord 61 is facilitated.
[0050] Fitting recess 12b of the present embodiment also enables a power cord to be fixedly
attached to housing 12. In this case, a mechanism for receiving and affixing the removable
power cord 61 is not provided within housing 12 of screwdriver 10. Therefore, a common
fitting portion (e.g., fitting recess 12b) can be utilized in order to affix either
the adapter for a removable power cord or a fixed power cord.
[0051] Fig. 8 shows screwdriver 10, which is identical to screwdriver 10 shown in Fig. 2,
but in which power cord 22 has been fixedly secured to housing 12. As shown in Fig.
8, power cord 22 may include cord guard 24, which prevents power cord 22 from being
sharply bent. Fitting portion 24a may be defined on a terminal end (e.g., an upper
end) of cord guard 24 and fitting portion 24a may have a substantially circular cross-section,
although naturally the shape of fitting portion 24a is preferably designed to be substantially
complementary to the shape of fitting recess 12b. For example, the thickness of fitting
portion 24a may be substantially equal to the height of fitting recess 12b. When fitting
portion 24a is disposed within fitting recess 12b, upper face 12f and lower face 12g
of fitting recess 12b will restrict axial movement of power cord 22.
[0052] In addition, cord clamp 27 may be disposed proximally to fitting recess 12b and cord
clamp 27 may be fastened to housing 12, e.g., by screw 26. Power cord 22a may extend
within housing 12 and may be firmly and securely disposed between housing 12 and cord
clamp 27. Power cord 22 can be disconnected or removed from housing 12 (i.e., from
fitting recess 12b) by separating housing half 12e from housing half 12d.
[0053] The present teachings may be modified in a variety of ways without departing from
the spirit of the present teachings. For example, the means for affixing the adapter
or the power cord to the housing is not particularly limited. The adapter or the power
cord may be affixed to the housing by threading the adapter or the power cord into
the housing, by tightly pressing (press-fitting) the adapter or the power cord into
the housing, or by any other means. In addition, although adapter 32 comprises sleeve
33 and insert 34 in the representative embodiment, adapter 32 may be a single-piece
(integral) device.
It is explicitly stated that all features disclosed in the description and/or the
claims are intended to be disclosed separately and independently from each other for
the purpose of original disclosure as well as for the purpose of restricting the claimed
invention independent of the compositions of the features in the embodiments and/or
the claims. It is explicitly stated that all value ranges or indications of groups
of entities disclose every possible intermediate value or intermediate entity for
the purpose of original disclosure as well as for the purpose of restricting the claimed
invention.
1. A power tool (10) including a motor (11) disposed within a housing (12), the motor
being adapted to drive the power tool,
characterized in further comprising:
an adapter (32) providing an electrical connection to the motor, the adapter including
an adapter fitting portion (33a), which is disposed within a fitting recess (12b)
defined within the housing, and a connector fitting portion (34) disposed external
to the housing, and
a power cord (61) removably connectable to the connector fitting portion, the power
cord including a cord fitting portion (62) arranged and constructed to engage the
connector fitting portion, thereby electrically connecting the power cord to the adapter,
wherein the fitting recess is also defined in order to be capable of receiving a power
cord fitting portion (24a) of a fixedly attached power cord (22).
2. A power tool as in claim 1, further comprising a receiving hole (34b) defined within
one of the connector fitting portion and the cord fitting portion and an insertion
projection (62a) defined on the other of the connector fitting portion and the cord
fitting portion, the insertion projection being arranged and constructed to be inserted
into the receiving hole.
3. A power tool as in claim 2, further comprising:
at least one projecting terminal (35) disposed within the receiving hole and
at least one receiving terminal (66a) disposed in the insertion projection and being
arranged and constructed to receive the at least one projecting terminal.
4. A power tool as in claim 2 or 3, wherein the receiving hole is defined within the
connector fitting portion and the insertion projection is disposed on the cord fitting
portion.
5. A power tool as in claim 2, 3 or 4, further comprising a recess (34c) defined within
the receiving hole and an engaging projection (62d) defined on an outer wall of the
cord fitting portion, the engaging projection being designed to engage the recess.
6. A power tool as in any one of claims 1-5, wherein the adapter further comprises a
sleeve (33) supporting the connector fitting portion, the adapter fitting portion
being defined on the sleeve.
7. A power tool as in claim 6, wherein the sleeve is attached to the housing such that
the sleeve is prevented from rotating with respect to the housing.
8. A power tool as in claim 6 or 7, wherein the sleeve rotatably supports the connector
fitting portion, one end of the sleeve is disposed beyond a corresponding end of the
connector fitting portion, first projections (33b) are defined on an inner wall of
a terminal end of the sleeve and second projections (62b) are defined on an outer
wall of the cord fitting portion,
wherein when the connector fitting portion is disposed in a first position with
respect to the sleeve, the first projections do not interfere with the second projections,
thereby allowing the insertion projection to be removed from and inserted into the
receiving hole and
wherein when the connector fitting portion engages the cord fitting portion and
is disposed in a second position with respect to the sleeve, the first projections
block the second projections from passing out of the receiving hole, thereby preventing
the insertion projection from being removed from the receiving hole.
9. A power tool as in claim 8, further comprising a locking mechanism (64) releasably
securing the power cord to the sleeve when the connector fitting portion is disposed
in the second position with respect to the sleeve.
10. A power tool as in claim 9, wherein the locking mechanism comprises a groove (33c)
defined within one of the sleeve and the power cord and a locking member (64a) defined
on the other of the sleeve and the power cord, wherein the locking member and the
groove are arranged and constructed to engage and disengage from each other by manipulating
the locking member.
11. A power tool as in claim 10, wherein the locking mechanism further comprises at least
one stopper (33g) arranged and constructed to prevent the locking member from dislodging
from the groove.
12. A power tool as in claim 10 or 11, wherein the locking member is defined on the power
cord.
13. A power tool as in claim 10, 11 or 12, wherein the locking member is arranged and
constructed so as to be urged toward engagement with the groove.
14. A power tool as in any one of claims 10-13, wherein the locking member comprises an
elastic resin body.