U.S. patent application number 11/949608 was filed with the patent office on 2009-06-04 for grinder with easily replacing grinding tool.
Invention is credited to Freddy Lin.
Application Number | 20090142998 11/949608 |
Document ID | / |
Family ID | 40676213 |
Filed Date | 2009-06-04 |
United States Patent
Application |
20090142998 |
Kind Code |
A1 |
Lin; Freddy |
June 4, 2009 |
GRINDER WITH EASILY REPLACING GRINDING TOOL
Abstract
A grinder has a main body formed with a shaft chamber and a
rotary shaft rotatably mounted in the shaft chamber. One end of the
rotary shaft outward protrudes from the main body for installing a
grinding tool thereon. A passage and a slide way are formed in the
main body. One end of the passage communicates with the shaft
chamber. A front end of the slide way communicates with the
passage. A chucking button is disposed in the passage. A link is
movably arranged in the slide way. An activation switch is mounted
on the main body for controlling the operation of the grinder. When
the grinder is not activated, the chucking button can be pressed to
chuck the rotary shaft for easy replacement of a grinding tool.
When the activation switch is switched on to activate the grinder,
the link is chucked in the chucking button to prevent the chucking
button from being pressed. Accordingly, when the grinder operates,
the chucking button cannot chuck the rotary shaft so as to ensure
safety. When the rotary shaft is chucked by the chucking button,
the activation switch cannot be switched on.
Inventors: |
Lin; Freddy; (Taichung
Hsien, TW) |
Correspondence
Address: |
SINORICA, LLC
528 FALLSGROVE DRIVE
ROCKVILLE
MD
20850
US
|
Family ID: |
40676213 |
Appl. No.: |
11/949608 |
Filed: |
December 3, 2007 |
Current U.S.
Class: |
451/359 |
Current CPC
Class: |
B24B 55/00 20130101;
B24B 23/026 20130101 |
Class at
Publication: |
451/359 |
International
Class: |
B24B 23/02 20060101
B24B023/02 |
Claims
1. A grinder with easily replacing grinding tool, comprising: an
elongated main body, a shaft chamber being formed in a front end of
the main body; an activation switch being arranged on the main body
and switchable between an activation position and a shutoff
position; a passage being transversely formed in the main body to
intersect the shaft chamber; a slide way being longitudinally
formed in the main body, a front end of the slide way communicating
with the passage; a rotary shaft rotatably mounted in the shaft
chamber, one end of the rotary shaft outward protruding from the
main body for installing a grinding tool thereon; at least one
engaging section being disposed on the rotary shaft; a chucking
button having at least one rod body, a chucking section being
formed on a circumference of the rod body, the rod body of the
chucking button being fitted in the passage and movable between a
chucking position and a releasing position; when the chucking
button is positioned in the chucking position, the rod body being
engaged with the engaging section of the rotary shaft; when the
chucking button is positioned in the releasing position, the rod
body of the chucking button being disengaged from the engaging
section, whereby the rotary shaft can freely rotate and the
chucking section is aligned with the front end of the slide way;
and a link mounted in the slide way of the main body and slidable
along the slide way; a resilient member being disposed in the slide
way to resiliently abut against the link, whereby in normal state,
the resilient member resiliently pushes the link to move rearward;
when the activation switch is positioned in the shutoff position,
the link being rearward moved to a releasing position and the front
end of the link being not chucked with the chucking button; when
the activation switch is positioned in the activation position, the
link is pushed to move forward, whereby the front end of the link
is chucked with the chucking section of the chucking button.
2. The grinder as claimed in claim 1, wherein the activation switch
is a trigger pivotally arranged on a circumference of the main
body.
3. The grinder as claimed in claim 2, further comprises a conduit
and an operation rod; the conduit is formed in the main body, the
conduit has an open end directed to the trigger; a rear end of the
slide way communicates with the conduit; the operation rod is
mounted in the conduit and movable along the conduit between an
operation position and a releasing position, one end of the
operation rod protruding out of the conduit and connected with the
trigger, whereby when the trigger is positioned in the shutoff
position, the operation rod is positioned in the releasing
position, while when the trigger is shifted and positioned in the
activation position, the operation rod is moved inward to forward
push the link to the chucking position.
4. The grinder as claimed in claim 3, wherein a small diameter
section is formed on the operation rod, when the operation rod is
positioned in the releasing position, the small diameter section is
aligned with the rear end of the slide way, whereby the rear end of
the link is moved into the conduit to contact with the small
diameter section.
5. The grinder as claimed in claim 3, wherein the outer end of the
operation rod contacts with the trigger; a resilient member is
mounted between the main body and the operation rod, whereby in
normal state, the resilient member resiliently forces the operation
rod to outward move to the releasing position.
6. The grinder as claimed in claim 4, wherein the outer end of the
operation rod contacts with the trigger; a resilient member is
mounted between the main body and the operation rod, whereby in
normal state, the resilient member resiliently forces the operation
rod to outward move to the releasing position.
7. The grinder as claimed in claim 1, wherein a button chamber is
formed on the circumference of the main body; the activation switch
is a rotary switch rotatably disposed in a switch chamber, the
rotary switch is rotatable between the shutoff position and the
activation position; the rear end of the slide way communicates
with the button chamber; the rear end of the link contacts with the
rotary switch.
8. The grinder as claimed in claim 7, wherein a recess is formed on
the circumference of the rotary switch, when the rotary switch is
positioned in the shutoff position, the recess is aligned with the
rear end of the slide way and the rear end of the link contacts
with the recess.
9. The grinder as claimed in claim 1, wherein the activation switch
is mounted at a rear end of the main body and movable along the
axis of the main body, when the activation switch is moved
rearward, the activation switch is positioned in the shutoff
position, while when the activation switch is moved forward, the
activation switch is positioned in the activation position; the
rear end of the slide way being aligned with a front end face of
the switch; the rear end of the link contacts with the switch.
10. The grinder as claimed in claim 1, wherein a resilient member
is arranged between the chucking button and the main body, whereby
in normal state, the chucking button is resiliently forced by the
resilient member and kept in the releasing position.
11. The grinder as claimed in claim 1, wherein the passage has a
first portion and a second portion in parallel to each other, the
first portion communicates with the shaft chamber; the front end of
the slide way communicates with the second portion; the chucking
button has a first rod body and a second rod body, the first rod
body is fitted in the first portion of the passage, while the
second rod body is fitted in the second portion of the passage; the
chucking section is formed on the second rod body; the first rod
body of the chucking button is engageable with the rotary
shaft.
12. The grinder as claimed in claim 11, wherein a resilient member
is disposed in the second portion of the passage to abut against
the second rod body of the chucking button, whereby in normal
state, the chucking button is kept in the releasing position.
13. The grinder as claimed in claim 1, wherein the passage further
has a cavity formed on the circumference of the main body; the
chucking button further has a button section connected with the rod
body, the button section is accommodated in the cavity.
14. The grinder as claimed in claim 1, wherein the engaging section
of the rotary shaft is a cave, whereby the rod body of the chucking
button is inserted into the cave to engage with the rotary
shaft.
15. The grinder as claimed in claim 11, wherein the engaging
section of the rotary shaft is a cave, whereby the first rod body
of the chucking button is inserted into the cave to engage with the
rotary shaft.
16. The grinder as claimed in claim 1, wherein the engaging section
is a dent formed on the circumference of the rotary shaft; the rod
body of the chucking button extending into the shaft chamber and
being formed with a depression, when the chucking button is
positioned in the releasing position, the depression is aligned
with the rotary shaft, when the chucking button is positioned in
the chucking position, the rod body is engaged with the engaging
section of the rotary shaft.
17. The grinder as claimed in claim 11, wherein the engaging
section is a dent formed on the circumference of the rotary shaft;
the first rod body of the chucking button extending into the shaft
chamber and being formed with a depression, when the chucking
button is positioned in the releasing position, the depression is
aligned with the rotary shaft, when the chucking button is
positioned in the chucking position, the first rod body is engaged
with the engaging section of the rotary shaft.
18. The grinder as claimed in claim 1, wherein the chucking section
of the chucking button is a dent.
19. The grinder as claimed in claim 11, wherein the chucking
section of the chucking button is a dent.
Description
FIELD OF THE INVENTION
[0001] The present invention is related to a grinding device, and
more particularly to a grinder in which the grinding tool can be
easily replaced. Moreover, when replacing the grinding tool, the
grinder is prevented from being powered on.
BACKGROUND OF THE INVENTION
[0002] A conventional grinder has a rotary shaft on which a
grinding tool such as a grinding disc or a buffing disc is mounted
for grinding a work piece.
[0003] In operation, it is necessary to frequently replace the
grinding tool. Conventionally, when replacing the grinding tool, a
hand tool is used to fix the rotary shaft and prevent the rotary
shaft from rotating. Under such circumstance, the grinding tool can
be replaced.
[0004] However, it is inconvenient to fix the rotary shaft with a
specific hand tool. In addition, a user must carry and store the
hand tool. In order to solve this problem, the inventor had
designed grinders with different kinds of mechanisms for chucking
the rotary shaft so that the grinding tool can be easily replaced
without using any hand tool. The invention is designed under the
same purpose.
SUMMARY OF THE INVENTION
[0005] It is therefore a primary object of the present invention to
provide a grinder in which the grinding tool can be easily
replaced.
[0006] It is a further object of the present invention to provide
the above grinder which has a secure design, the grinder is
prevented from being incautiously activated when replacing the
grinding tool.
[0007] The present invention can be best understood through the
following description and accompanying drawings wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a perspective view of a first embodiment of the
present invention;
[0009] FIG. 2 is a sectional view taken along line 2-2 of FIG.
1;
[0010] FIG. 3 is a sectional view taken along line 3-3 of FIG.
2;
[0011] FIG. 4 is a sectional view taken along line 4-4 of FIG.
3;
[0012] FIG. 5 is a sectional view according to FIG. 4, showing that
the chucking button chucks the rotary shaft;
[0013] FIG. 6 is a sectional view according to FIG. 2, showing that
the chucking button is positioned in the chucking position;
[0014] FIG. 7 is a sectional view according to FIG. 3, showing that
the trigger is pulled;
[0015] FIG. 8 is a sectional view taken along line 8-8 of FIG.
7;
[0016] FIG. 9 is a perspective view of a second embodiment of the
present invention;
[0017] FIG. 10 is a longitudinal sectional view according to FIG.
9;
[0018] FIG. 11 is a side view according to FIG. 9;
[0019] FIG. 12 is a sectional view taken along line 12-12 of FIG.
11;
[0020] FIG. 13 is a sectional view taken along line 13-13 of FIG.
11, showing that the chucking button chucks the rotary shaft;
[0021] FIG. 14A is a front perspective view of the chucking
button;
[0022] FIG. 14B is a rear perspective view of the chucking
button;
[0023] FIG. 15 is a sectional view taken along line 15-15 of FIG.
12;
[0024] FIG. 16 is a sectional view according to FIG. 13, showing
that the chucking button is disengaged from the rotary shaft;
[0025] FIG. 17 shows that the activation switch is switched;
[0026] FIGS. 18 and 19 are sectional view according to FIGS. 15 and
12, showing that when the grinder is activated, the chucking button
is chucked;
[0027] FIG. 20 is a sectional view of a third embodiment of the
present invention;
[0028] FIG. 21 is a perspective view of the chucking button of FIG.
20; and
[0029] FIGS. 22 and 23 are side views of a fourth embodiment of the
present invention, respectively showing that the activation switch
is positioned in the shutoff position and in the activation
position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0030] Please refer to FIGS. 1 and 2. According to a first
embodiment, the grinder 10 of the present invention is a pneumatic
grinder. However, the design of the present invention is also
applicable to an electric grinder.
[0031] The grinder 10 includes an elongated main body 20. A rear
end of the main body 20 is connected to a power source. (The power
source of the pneumatic grinder is high-pressure gas, while the
power source of the electric grinder is electricity.) A driving
mechanism 22 such as a rotor or a motor is arranged in the main
body. A rotary shaft 24 is rotatably mounted in a shaft chamber 23
of the main body 20. A transmission section 25 such as a bevel gear
is fixedly connected with the rotary shaft 24 and connected to the
driving mechanism 22. One end of the rotary shaft 24 outward
protrudes from the main body for installing a grinding tool 27
thereon. An activation switch which is a trigger 28 in this
embodiment is pivotally arranged on the circumference of the main
body 20, such as on a bottom face or a top face thereof. The
trigger 28 is movable between an activation position and a shutoff
position. When the trigger 28 is positioned in the activation
position, the grinder is powered on to operate the driving
mechanism 22 for driving the rotary shaft 24 to rotate to process a
work piece.
[0032] Referring to FIGS. 2 to 4, a passage 30 is transversely
formed in the main body 20 to intersect the shaft chamber 23. As
shown in FIGS. 2 and 3, a slide way 32 is longitudinally formed in
the main body 20. A front end of the slide way 32 communicates with
the passage 30. A conduit 34 is formed in the main body. The
conduit 34 has an open end directed to the trigger 28. To speak
more detailedly, the passage 30 has a first portion 301 and a
second portion 302 in parallel to each other as shown in FIGS. 2 to
4. An inner end of the first portion 301 communicates with the
shaft chamber 23. The front end of the slide way 32 communicates
with the second portion 302. The passage 30 further has a cavity
303 formed on a circumference of the main body to communicate with
outer ends of the two portions 301, 302.
[0033] A chucking button 40 which in this embodiment has a button
section 42, a first rod body 44 and a second rod body 46 in
parallel to the first rod body 44. The rod bodies 44, 46 are
connected with the button section 42. A dented chucking section 47
is formed on the circumference of a rear side of the second rod
body 46. The chucking button 40 is fitted in the passage 30 of the
main body 20. The first rod body 44 is fitted in the first portion
301 of the passage as shown in FIGS. 2 and 3, while the second rod
body 46 is fitted in the second portion 302 as shown in FIGS. 3 and
4. The button section 42 is accommodated in the cavity 303. The
chucking button 40 is movable between a chucking position as shown
in FIG. 5 and a releasing position as shown in FIGS. 2 and 4. A
resilient member 48 is positioned in the second portion 302 of the
passage to resiliently abut against the second rod body 46 of the
chucking button. In normal state, the chucking button 40 is outward
forced by the resilient member 48 and positioned in the releasing
position.
[0034] A link 50 is mounted in the slide way 32 of the main body
and slidable along the slide way. A resilient member 55 is fitted
on the link 50. Two ends of the resilient member 55 respectively
abut against a shoulder section 52 of the link and a shoulder
section 321 of the slide way. The resilient member 55 always
resiliently forces the link 50 toward a rear end of the main
body.
[0035] An operation rod 60 is mounted in the conduit 34 of the main
body and slidable along the conduit 34. The circumference of the
operation rod 60 is formed with a small diameter section 62 and a
conic section 64 connected with the small diameter section. A
resilient member 65 is mounted in the conduit 34. In normal state,
the operation rod 60 is outward forced by the resilient member 65
and positioned in a releasing position, whereby an outer end of the
operation rod 60 protrudes out of the conduit 34 to contact with
the trigger 28.
[0036] The transmission section 25 of the rotary shaft 24 is
further formed with two engaging sections 26 which are two caves as
shown in FIG. 4.
[0037] The operation of the present invention will be described
hereinafter.
[0038] Referring to FIG. 3, when the trigger 28 is positioned in
the shutoff position, the grinder 20 is not activated. At this
time, the operation rod 60 is positioned in the releasing position
where the small diameter section 62 is aligned with a rear end of
the slide way 32. Under such circumstance, there is room for the
link 50 to move rearward. Accordingly, the link 50 is pushed by the
resilient member 55 to move rearward to a releasing position. The
rear end of the link 50 is moved into the conduit 34 to contact
with the small diameter section 62 of the operation rod 60. Under
such circumstance, referring to FIG. 2, the chucking button 40 is
free from the hindrance of the link 50, and is movable between the
releasing position and the chucking position. When not pressed, the
chucking button 40 is pushed by the resilient member 48 and held in
the releasing position. At this time, the chucking section 47 of
the second rod body 46 of the chucking button is right aligned with
the front end of the slide way 32.
[0039] When the grinder is not activated, a user can replace the
grinding tool. The user can hold the grinder with one hand and
press the chucking button 40 to move the chucking button 40 into
the main body 20 toward the chucking position as shown in FIG. 5.
At this time, the first rod body 44 of the chucking button is
inserted into one of the engaging sections 26 of the rotary shaft
24. The rotary shaft is therefore fixed and cannot be rotated.
Accordingly, the user can replace the grinding tool with the other
hand.
[0040] Referring to FIG. 6, when the chucking button is positioned
in the chucking position, the chucking section 47 of the second rod
body 46 is no longer aligned with the front end of the slide way
32. Therefore, the link 50 is hindered by the second rod body 46
from moving forward. Accordingly, when the chucking button chucks
the rotary shaft, the link 50 cannot move forward so that the
trigger 28 cannot be triggered. Therefore, the grinder cannot be
activated to ensure safety.
[0041] After the replacement is accomplished, the chucking button
is released from being pressed, whereby the chucking button
resiliently restores to the releasing position as shown in FIG. 4,
the chucking button is disengaged from the rotary shaft.
[0042] When the chucking button 40 is positioned in the releasing
position, the rotary shaft 24 is not engaged with the chucking
button. At this time, the chucking section 47 of the second rod
body 46 provides a space for the link 50 to more forward. Under
such circumstance, the trigger 28 can be pulled to the activation
position as shown in FIG. 7 to activate the grinder. When the
trigger 28 is positioned in the activation position, the operation
rod 60 is driven and moved upward by the trigger to an operation
position where the small diameter section 62 no more contacts with
the link 50. Instead, the body of the operation rod 60 contacts
with the rear end of the link 50, the operation rod pushes the link
forward to a chucking position whereby the front end of the link is
chucked in the chucking section 47 of the chucking button 40 as
shown in FIG. 8.
[0043] When the grinder operates, the link 50 is engaged with the
chucking button 40 as shown in FIG. 8. At this time, the chucking
button 40 cannot be pressed so that the chucking button will not
engage with the rotary shaft in rotation.
[0044] When replacing the grinding tool again, it is necessary to
first shut off the grinder so that the chucking button can chuck
the rotary shaft. When turning on the grinder, it must be that the
chucking button is disengaged from the rotary shaft so that the
grinder can be activated.
[0045] FIGS. 9, 10 and 12 show a second embodiment of the present
invention, which includes a main body 80, an activation switch 86,
a chucking button 100 and a link 110. Two dented engaging sections
92 are formed on the circumference of the transmission section 85
of the rotary shaft 84 as shown in FIG. 13.
[0046] In this embodiment, the activation switch 86 is a rotary
switch rotatably disposed in a switch chamber 87 formed on the
circumference of the main body 80 as shown in FIGS. 12 and 15. A
recess 88 is formed on the circumference of the switch 86.
[0047] The main body is also formed with a passage 94 as shown in
FIG. 13 and a slide way 96 as shown in FIGS. 12 and 15. A first
portion 941 of the passage communicates with the shaft chamber 83
and passes through the main body from one side to another side
thereof. Two ends of the slide way 96 respectively communicate with
a second portion 942 of the passage 94 and the switch chamber
87.
[0048] Referring to FIG. 16, the first rod body 104 of the chucking
button 100 is an elongated rod body, while the second rod body 106
is a short rod body. A depression 105 is formed on a front side of
the elongated rod body 104. A chucking section 107 is formed on a
rear side of the short rod body 106. The elongated rod body 104 is
fitted through the first portion 941 of the passage 94 to extend
into the shaft chamber 83. The short rod body 106 is fitted in the
second portion 942 of the passage. In practice, a resilient member
can be arranged in the main body for resiliently forcing the
chucking button, whereby the chucking button is kept in a releasing
position in normal state. The button section 102 of the chucking
button 100 is accommodated in a cavity 943 of the passage.
[0049] The link 110 is slidable within the slide way 96 and
resiliently pushed by a resilient member 115.
[0050] When the activation switch 86 is positioned in a shutoff
position as shown in FIG. 11, the power is cut off from the
grinder. At this time, as shown in FIGS. 12 and 15, the recess 88
of the switch is aligned with the slide way 96. The link 110 is
resiliently pushed by the resilient member 115 to move rearward to
a releasing position. The rear end of the link 110 contacts the
recess 88 of the switch 86. At this time, the chucking button 110
is free from the hindrance of the front end of the link 110,
whereby the chucking button 110 is switchable between a chucking
position as shown in FIGS. 12, 13 and a releasing position as shown
in FIG. 16.
[0051] When the chucking button 110 is switched to the chucking
position as shown in FIG. 13, the first rod body 104 of the
chucking button is engaged with the engaging section 92 of the
rotary shaft, whereby the rotary shaft cannot rotate. Accordingly,
the rotary shaft is fixed for replacing the grinding tool.
[0052] Furthermore, as shown in FIG. 12, when the chucking button
110 is positioned in the chucking position, the chucking section
107 is not aligned with the front end of the slide way 96. The
front end of the link 110 contacts with the rod body 106 of the
chucking button so that the link 110 cannot move forward.
Therefore, the activation switch 86 cannot be rotated.
[0053] When turning on the grinder, the chucking button 100 must be
pressed to the releasing position of FIG. 16, whereby the
depression 105 of the chucking button is aligned with the rotary
shaft 84 and the chucking button is disengaged from the rotary
shaft. Also, as shown in FIG. 19, when the chucking button is
positioned in the releasing position, the chucking section 107 is
aligned with the slide way 96, whereby there is a space for the
link to move forward. Under such circumstance, the switch 86 can be
switched to the activation position as shown in FIGS. 17 and 18 for
turning on the grinder. When the switch 86 is moved to the
activation position, the link 110 is pushed forward to the chucking
position where the front end of the link is chucked in the chucking
section 107 of the chucking button 100 as shown in FIG. 19.
Accordingly, when the grinder operates, the link is engaged with
the chucking button so that the chucking button cannot be moved.
Only when the grinder is turned off, the chucking button can chuck
the rotary shaft. Only when the chucking button is not engaged with
the rotary shaft, the switch can be switched.
[0054] FIGS. 20 and 21 show a third embodiment of the present
invention, which is different from the second embodiment in that
the chucking button 100' only has one rod body 104' fitted in the
passage 94'. A depression 105' is formed on a front side of the rod
body and a chucking section 107' is formed on a rear side of the
rod body for engaging with the rotary shaft 84' and chucking the
link 110'. The operation of the embodiment is identical to that of
the second embodiment.
[0055] In the first embodiment, the chucking button can
alternatively have only one rod body.
[0056] FIG. 22 shows a fourth embodiment of the grinder 120 of the
present invention. The activation switch of the fourth embodiment
is different from the activation switch of any of the above
embodiments. The other components of this embodiment, such as the
chucking button and the link, are identical to those of the above
embodiments and thus will not be repeatedly described
hereinafter.
[0057] The activation switch 130 is mounted at a rear end of the
main body 122 and is movable along the axis of the main body. The
rear end of the link 125 is aligned with a front end face of the
activation switch. FIG. 22 shows that the switch 130 is positioned
in a shutoff position. Under such circumstance, the link 125 is
positioned in a releasing position without chucking the chucking
button.
[0058] When turning on the grinder, the switch 130 is pushed
forward and located in an activation position as shown in FIG. 23.
Under such circumstance, the link 125 is pushed by the switch 130
to move forward to the engaging position whereby the link 125 is
engaged with the chucking button. In this embodiment, the switch is
back and forth movable for pushing and releasing the link.
[0059] According to the above arrangement of the present invention,
a user only needs to press the chucking button for fixing the
rotary shaft without using any tool. Therefore, the replacement of
the grinding tool is facilitated. Also, the grinder of the present
invention provides a secure effect. That is, when replacing the
grinding tool, it is impossible to turn on the grinder. When the
grinder operates, the chucking button is prevented from chucking
the rotary shaft.
[0060] The above embodiments are only used to illustrate the
present invention, not intended to limit the scope thereof. Many
modifications of the above embodiments can be made without
departing from the spirit of the present invention.
* * * * *