Note: Descriptions are shown in the official language in which they were submitted.
TOOL CONNECTING ROD
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a tool connecting rod.
Description of the Prior Art
A conventional tool connecting rod 100 (please refer to figures 9 and 10)
includes a rod body 101 and a sleeve 102 non-rotatably sleeved to the rod body
101,
and the sleeve 102 is configured to be assembled with a connecting member 200
(such as bits, screws, nuts, or the like). One end of the rod body 101 is
configured to
be assembled with a driving tool to drive the tool connecting rod 100 to
rotate, and
the other end of the rod body 101 penetrates into the sleeve 102 and has a
magnetic
member 103 disposed thereon for attracting the connecting member 200.
However, a diametrical dimension of the rod body 101 usually corresponds to a
diametrical dimension of the sleeve 102 so that the rod body 101 and the
sleeve 102
.. are unmovable radially relative to each other. Therefore, the magnetic
member 103 is
easy to be damaged due to impact of the connecting member 200 when the tool
connecting rod 100 is driven to drive the connecting member 200 to rotate. In
addition, a relative position of the magnetic member 103 and the sleeve 102 is
inaccurate due to manufacturing tolerances. For example, when the rod body 101
is
too short or the sleeve 102 is too long, a length of the magnetic member 103
protruding into an assembling hole of the sleeve 102 is not long enough so
that a gap
104 is formed between the magnetic member 103 and the connecting member 200,
as shown in figure 9, which results in insufficient magnetic attraction of the
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magnetic member 103 to the connecting member 200. When the rod body 101 is too
long or the sleeve 102 is too short, the magnetic member 103 excessively
protrudes
into the assembling hole so that the connecting member 200 cannot be
sufficiently
inserted into the assembling hole and an interval 105 is formed between the
connecting member 200 and the sleeve 102, as shown in figure 10, which results
in
poor operational stability, poor force transmission and damage to the magnetic
member 103. As a result, the conventional tool connecting rod 100 requests low
manufacturing tolerances, which is high cost.
The present invention is, therefore, arisen to obviate or at least mitigate
the
above-mentioned disadvantages.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a tool connecting rod,
which is easy to manufacture and is durable.
To achieve the above and other objects, the present invention provides a tool
connecting rod, including: a main body, a sleeve member and a magnetic
mechanism.
The main body includes a driving portion and an assembling portion opposite to
the
driving portion, and the assembling portion has an assembling hole extending
in an
axial direction. The sleeve member is non-rotatably disposed on the assembling
portion and includes at least one sleeving hole configured to be connected
with a
connecting member. The magnetic mechanism is disposed within the assembling
hole and includes a magnetic member penetrating into the sleeve member and an
elastic member abutted against and between the main body and the magnetic
member. In a circumferential direction of the magnetic member, a first gap is
defined
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between the sleeve member and the magnetic member so that the sleeve member
and
the magnetic member are movable radially relative to each other.
The present invention will become more obvious from the following description
when taken in connection with the accompanying drawings, which show, for
purpose
of illustrations only, the preferred embodiment(s) in accordance with the
present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a stereogram of a preferable embodiment of the present invention;
Fig. 2 is a breakdown drawing of a preferable embodiment of the present
invention;
Fig. 3 is another stereogram of a preferable embodiment of the present
invention;
Figs. 4 and 5 are cross-sectional views showing operation according to a
preferable embodiment of the present invention;
Fig. 6 is a partial enlargement of Fig.4;
Fig. 7 is a schematic diagram of a preferable embodiment of the present
invention in use;
Fig. 8 is a stereogram showing application according to a preferable
embodiment of the present invention;
Fig. 9 is a cross-sectional view of a conventional tool connecting rod; and
Fig. 10 is a cross-sectional view of another conventional tool connecting rod.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Please refer to Figs. 1 to 8 for a preferable embodiment of the present
invention.
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A tool connecting rod 1 of the present invention includes a main body 10, a
sleeve
member 20 and a magnetic mechanism 30.
The main body 10 includes a driving portion 11 and an assembling portion 12
opposite to the driving portion 11, and the assembling portion 12 has an
assembling
hole 121 extending in an axial direction A. The sleeve member 20 is non-
rotatably
disposed on the assembling portion 12 and includes at least one sleeving hole
21
configured to be connected with a connecting member 2. The magnetic mechanism
30 is disposed within the assembling hole 121 and includes a magnetic member
31
penetrating into the sleeve member 20 and an elastic member 32 axially abutted
against and between the main body 10 and the magnetic member 31, as shown in
figures 4 and 5. In a circumferential direction of the magnetic member 31, a
first gap
GI is defined between the sleeve member 20 and the magnetic member 31 so that
the sleeve member 20 and the magnetic member 31 are movable radially relative
to
each other. Therefore, the elastic member 32 allows the magnetic member 31 to
have
a tendency to move in a direction toward the at least one sleeving hole 21 for
high
tolerance and easy manufacturing. When the driving portion 11 is driven to
drive the
connecting member 2 to rotate, the elastic member 32 and the first gap GI
allow the
magnetic member 31 to move relative to the sleeve member 20, which effectively
prevents the magnetic member 31 from impact and damage so as to have good
durability.
The driving portion 11 is configured to be assembled with a pneumatic tool, an
electric tool, a handle 3 (as shown in figure 8) or the like, which has a wide
range of
applications. The connecting member 2 may be a screw, a nut, a socket or a
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screwdriver, or the like. Specifically, the sleeve member 20 further includes
a
penetrating groove 22 communicated with each of the at least one sleeving hole
21,
and a diametrical dimension of the penetrating groove 22 is smaller than a
diametrical dimension of each of the at least one sleeving hole 21. The first
gap G1
is defined between a groove wall of the penetrating groove 22 and the magnetic
member 31. In this embodiment, the first gap G I extends annularly in the
circumferential direction and allows the magnetic member 31 to move (rotate or
swing radially) relative to the sleeve member 20 so as to have good freedom of
movement. As viewed in the axial direction A, the first gap G 1 is larger than
or equal
to 0.5mm (smaller or equal to 1mm, preferably) so as to provide a sufficient
margin
of movement and stable assembling. The magnetic member 31 includes a magnetic
end portion 311, and the magnetic end portion 311 at least partially protrudes
beyond
the penetrating groove 22 and extends into one of the at least one sleeving
hole 21 so
as to provide sufficient magnetic attraction to the connecting member 2.
Specifically,
the magnetic end portion 311 includes a recess 312 and a magnet 313 received
within the recess 312, and the magnet 313 preferably axially protrudes beyond
the
recess 312 to have good magnetic attraction effect. However, in the
circumferential
direction, the groove wall of the penetrating groove may partially contact the
magnetic member and defined one or more said first gaps; the magnet may be
flushed with the recess; the magnetic end portion may be directly connected
with
one said magnet without the recess.
The tool connecting rod 1 further includes a restriction mechanism 40, and the
restriction mechanism 40 includes at least one restriction member 41
retractably
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protruding from an inner circumferential wall of the assembling portion 12. An
outer
circumferential wall of the sleeve member 20 has at least one engaging groove
24
which is engageable with the at least one restriction member 41 so that the
sleeve
member 20 is detachably assembled with the assembling portion 12. In this
embodiment, an outer circumferential wall of the assembling portion 12 has an
annular groove 124 disposed thereon, and a bottom side of the annular groove
124
has at least one through hole 125 communicating the annular groove 124 with
the
assembling hole 121. Each of the at least one restriction member 41 is
received
within one of the at least one through hole 125. The restriction mechanism 40
further
includes a resilient member 42 received within the annular groove 124 and
radially
biased against the at least one restriction member 41 toward the assembling
hole 121
so that the at least one restriction member 41 has a tendency to radially move
in a
direction toward the assembling hole 121. Each of the at least one restriction
member 41 is a steel ball, and the resilient member 42 is a coil spring
sleeved around
the annular groove 124, which has a simple structure and is easy to process
and
manufacture. In other embodiments, the restriction mechanism may have a
plurality
of said restriction members; the restriction mechanism may have a plurality of
said
resilient members respectively corresponding to one said restriction member;
the at
least one restriction member may be a blocking projection selectively
protruding into
the assembling hole.
Please refer to figures 4 to 7, the sleeve member 20 is detachably disposed
within the assembling hole 121, and the magnetic end portion 311 preferably
protrudes axially beyond the assembling hole 121 so that iron filings attached
to the
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magnet 313 is easy to be cleaned after detaching the sleeve member 20, as
shown in
figure 7. The at least one sleeving hole 21 includes a first sleeving hole 211
and a
second sleeving hole 212 which are disposed on two opposite sides of the
penetrating groove 22. A first blocking shoulder 23a is disposed between the
first
sleeving hole 211 and the penetrating groove 22, and a second blocking
shoulder 23b
is disposed between the second sleeving hole 212 and the penetrating groove
22. The
first blocking shoulder 23a and the second blocking shoulder 23b are
respectively
blockable with the magnetic member 31 in the axial direction A so that a
length of
the magnetic member 31 protruding into one of the first sleeving hole 211 and
the
second sleeving hole 212 is unchanged. The first sleeving hole 211 and the
second
sleeving hole 212 are different from each other in at least one of a shape, a
diametrical dimension and an axial depth so that the sleeve member 20 is
applicable
to different types of said connecting members by adjusting an assembling
direction
of the sleeve member 20.
Moreover, the assembling portion 12 includes a blocking portion 13 radially
protruding therefrom. The magnetic member 31 includes a large diameter section
314, a small diameter section 315 and a shoulder portion 316 connected between
the
large diameter section 314 and the small diameter section 315, and the large
diameter section 314 has a head portion 317 which is axially blockable with
the
blocking portion 13. The shoulder portion 316 is axially abutted against the
sleeve
member 20. Therefore, the head portion 317 and the blocking portion 13 avoid
the
magnetic member 31 detaching from the assembling hole 121, and the shoulder
portion 316 is axially abutted against one of the first blocking shoulder 23a
and the
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second blocking shoulder 23b to match one of said sleeving holes with
different
axial depths. For example, when an end of the sleeve member 20 having the
second
sleeving hole 212 is inserted into the assembling hole 121 and the second
blocking
shoulder 23b is abutted against the shoulder portion 316, a portion of the
large
diameter section 314 extends into the second sleeving hole 212 and the
magnetic end
portion 311 extends into the first sleeving hole 211, as shown in figures 4
and 6.
When an end of the sleeve member 20 having the first sleeving hole 211 is
inserted
into the assembling hole 121 and the first blocking shoulder 23a is abutted
against
the shoulder portion 316, since the first sleeving hole 211 has a smaller
axial depth
relative to the second sleeving hole 212, the elastic member 32 is compressed
by the
head portion 317 and the magnetic member 31 is moved toward the driving
portion
11, which prevents the magnetic end portion 311 from excessively protruding
into
the second sleeving hole 212, as shown in figure 5. With configurations as
described
above, a distance that the magnetic end portion 311 extending into the at
least one
sleeving hole 21 is effectively restricted and the influence of manufacturing
tolerances is reduced so that a manufacturing cost of the tool connecting rod
1 is
reduced.
The large diameter section 314 is disposed through the blocking portion 13. In
the circumferential direction, a second gap G2 is defined between the large
diameter
section 314 and the blocking portion 13, which allows movement of the magnetic
member 31 to avoid damage to components. In this embodiment, the assembling
hole 121 includes a first segment 122 adjacent to the driving portion 11 and a
second
segment 123 communicated with the first segment 122 and open outwardly, and a
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diametrical dimension of the first segment 122 is smaller than a diametrical
dimension of the second segment 123. The first segment 122 has the blocking
portion 13 disposed thereon, and the second segment 123 receives the sleeve
member 20 therewithin. The blocking portion 13 includes a restricting ring 131
being axially interferable with the head portion 317 and an engaging member
132
connected the assembling portion 12 with the restricting ring 131 for stable
restriction and easy assembling. However, the restricting ring may be
connected with
the assembling portion in tight-fit without the engaging member; the
assembling
portion may have the blocking portion integrally protruding therefrom.
Although particular embodiments of the invention have been described in detail
for purposes of illustration, various modifications and enhancements may be
made
without departing from the spirit and scope of the invention. Accordingly, the
invention is not to be limited except as by the appended claims.
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