Information
-
Patent Grant
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6676494
-
Patent Number
6,676,494
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Date Filed
Wednesday, June 11, 200321 years ago
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Date Issued
Tuesday, January 13, 200420 years ago
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Inventors
-
-
Examiners
Agents
-
CPC
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US Classifications
Field of Search
US
- 451 48
- 451 231
- 451 241
- 451 375
- 451 178
- 451 451
- 451 457
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International Classifications
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Abstract
A drill bit grinder structure includes: a seat body having a housing, an arched sideboard with a predetermined curvature being disposed on one side of the housing, a slide slot with a predetermined length being formed on the arched sideboard; a fitting member inserted through the slide slot and slidable along the length of the slide slot; and a clamp head fitted through the fitting member. The drill bit grinder structure is characterized by at least a first engaging section disposed on a sidewall of the slide slot and at least a second engaging section disposed in a predetermined position on the circumference of the fitting member corresponding to the first engaging section. The second engaging section can be engaged with the first engaging section to locate the fitting member in a position within the slide slot.
Description
BACKGROUND OF THE INVENTION
The present invention is related to a grinding tool, and more particularly to an improved drill bit grinder structure.
U.S. Pat. No. 5,735,732 discloses a grinding apparatus for grinding drill bit. The grinding apparatus includes a sleeve clamp for locating the drill bit in accordance with the shape of the tip of the drill bit. The drill bit is axially clamped and located by the sleeve clamp. Via a specific guide structure, the sleeve clamp is rotated to move the tip of the drill bit up and down relative to the grinding wheel. Accordingly, the tip of the drill bit properly contacts with the circumference of the grinding wheel to complete the grinding operation.
In the above Patent, by means of an angle adjustment mechanism, the sleeve clamp can be slid within a predetermined range in the housing so as to change the contact angle between the tip of the drill bit and the grinding wheel. Therefore, the tip of the drill bit can be ground by different angles.
However, the angle adjustment mechanism is not optimal. The sleeve clamp is fixed by an external bolt. This is inconvenient to a user. In addition, the sleeve clamp is adjusted and located in accordance with some scales serving as reference coordinate. However, when adjusted, the sleeve clamp still needs to be manually accurately moved and aimed at the scales.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an improved drill bit grinder structure in which the contact angle between the tip of the drill bit and the grinding wheel can be quickly and conveniently adjusted.
According to the above object, the drill bit grinder structure includes: a seat body having a housing, an arched sideboard with a predetermined curvature being disposed on one side of the housing, a slide slot with a predetermined length being formed on the arched sideboard; a fitting member inserted through the slide slot and slidable along the length of the slide slot; and a clamp head fitted through the fitting member. The drill bit grinder structure is characterized by at least a first engaging section disposed on a sidewall of the slide slot and at least a second engaging section disposed in a predetermined position on the circumference of the fitting member corresponding to the first engaging section. The second engaging section can be engaged with the first engaging section to locate the fitting member in a position within the slide slot.
The present invention can be best understood through the following description and accompanying drawings wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a perspective exploded view of preferred embodiment of the present invention;
FIG. 2
is perspective assembled view of the preferred embodiment of the present invention;
FIG. 3
is a sectional view taken along line
3
—
3
of
FIG. 2
;
FIG. 4
is a sectional view taken along line
4
—
4
of
FIG. 2
;
FIG. 5
is a plane view of the present invention, showing that the drill bit is clamped by the clamp head and the length of the drill bit extending out of the clamp head is fixed; and
FIG. 6
is a plane view showing that the drill bit is located in a position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Please refer to
FIGS. 1
to
6
. According to a preferred embodiment, the drill bit grinder structure
10
of the present invention includes a seat body
20
, two first engaging sections
30
, a fitting member
40
, two second engaging sections
50
and a clamp head
60
.
The seat body
20
has a housing
21
with a certain shape for accommodating therein a power set and a grinding wheel of a conventional grinder. An arched sideboard
22
is disposed on one side of the housing
21
. The curvature of the arched sideboard
22
corresponds to the curvature of the grinding wheel received in the housing
21
, whereby the sideboard
22
is spaced from the circumference of the grinding wheel by a predetermined distance. A slide slot
23
is formed on the sideboard
22
and extends along the arched face of the sideboard
22
by a certain length. Two pairs of end sections
24
respectively project from two lengthwise sidewalls of the slide slot
23
and are spaced from each other by a certain distance. Each pair of end sections
24
are spaced from the sidewalls of the slide slot
23
by a certain distance to define two insertion channels
25
opposite to each other. An end face of the housing
21
is formed with a through hole
26
. A stop plate
27
is disposed in the housing
21
and positioned in an axial position of the through hole
26
. Two locating pins
28
are fixedly perpendicularly disposed on a face of the stop plate
27
facing the through hole
26
. The locating pins
28
are spaced from each other and correspond to each other.
The first engaging sections
30
are leaf springs with a certain length and thickness. The first engaging sections
30
are waved and extend in the lengthwise direction. Two ends of each first engaging section
30
are inlaid in the insertion channels
25
defined by the corresponding end sections
24
. Accordingly, the first engaging sections
30
are respectively parallelly attached to the lengthwise sidewalls of the slide slot
23
with the crests of the first engaging sections
30
opposite to each other.
The fitting member
40
has a tubular main body
41
perpendicularly inserted through the slide slot
23
. The fitting member
40
can be slid along the length of the slide slot
23
. The bottom end of the fitting member
40
extends into the housing
21
. An annular end plate
42
is coaxially fixedly disposed at top end of the main body
41
. The bottom face of the end plate
42
faces the arched sideboard
22
. Two arched abutting blocks
43
are respectively formed on the bottom face of the end plate
42
. The bottom arched faces
431
of the arched abutting blocks
43
abut against the upper face of the arched sideboard
22
on two lengthwise sides of the slide slot
23
. The curvature of the bottom arched faces
431
corresponds to the curvature of the arched sideboard
22
, whereby when the fitting member
40
slides in the lengthwise direction of the slide slot
23
, the fitting member
40
is well supported. Two first guide blocks
44
with a certain shape are formed in two corresponding positions of upper face of the end face
42
and project therefrom.
The two second engaging sections
50
are two projecting blocks respectively formed on the circumference of the main body
41
opposite to each other. The second engaging sect ion
50
has a profile complementary to that of the first engaging section
30
and is adapted to engage with the first engaging section
30
. Accordingly, the fitting member
40
can be well located in the slide slot
23
.
The clamp head
60
pertains to prior art for clamping rod-shaped article. The clamp head
60
has a cylindrical head section
61
formed with a central hole. The diameter of the central hole is changeable in accordance with the diameter of the rod-shaped article to be clamped. The drill bit can be clamped by the clamp head
60
and coaxially fitted in the hole of the main body
41
. A flange
611
of one end of the head section
61
faces the upper face of the end plate
42
. A rotary disc
62
is coaxially connected with the end of the head section
61
for an operator to keep the clamp head
60
rotatably fitted in the main body
41
. A second guide block
63
projects from the end face of the flange of the head section
61
facing the end plate
42
. The end of the second guide block
63
abuts against the upper face of the end plate
42
. When the clamp head
60
is rotated within the fitting member
40
, the second guide block
63
moves on the upper face of the end plate
42
. When the second guide block
63
abuts against the first guide block
44
, the clamp head
60
is forcedly axially moved for grinding the drill bit.
According to the above arrangement, the fitting member
40
can be moved within the slide slot
23
so as to change the contact angle contained between the drill bit clamped by the clamp head
60
and the grinding wheel accommodated in the seat body
20
. Accordingly, different types of drill bits can be conveniently ground. The first and second engaging sections
30
,
50
are engaged to resiliently locate the fitting member
40
, whereby after the fitting member
40
is slid to a predetermined specific position, the fitting member
40
is resiliently located in the slide slot
23
. Therefore, according to the required grinding angle of a known drill bit, the fitting member
40
can be quickly moved to a corresponding position to facilitate drill bit grinding operation. In contrast, in the aforesaid Patent, no locating measure is provided. Moreover, in the present invention, the fitting member is directly pushed and moved without any other fixing operation. This is simple and meets the actual requirement in use.
It should be noted that the stop plate
27
is spaced from the through hole
26
by a fixed distance, whereby when the head section
61
of the clamp head
60
is inserted into the through hole
26
, the end of the clamped drill bit abuts against the stop plate
27
. Therefore, the length of the drill bit extending out of the head section
61
can be controlled (as shown in FIG.
5
). Moreover, the two locating pins
28
of the stop plate
27
are inserted into two symmetrical twist grooves of the tip of the drill bit so as to fix the angular state of the drill bit and the head section
61
(as shown in FIG.
6
). Accordingly, the clamp head
60
can clamp the drill bit in a specific space pattern to facilitate the drill bit grinding operation.
The above embodiment is only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiment can be made without departing from the spirit of the present invention.
Claims
- 1. A drill bit grinder structure comprising:a seat body having a housing for housing a grinding wheel, an arched sideboard with a predetermined curvature being disposed on one side of the housing, a slide slot with a predetermined length being formed on the arched sideboard; a fitting member inserted through the slide slot and slidable along the length of the slide slot; and a clamp head for holding a drill bit fitted through the fitting member, said drill bit grinder structure being characterized by: at least a first engaging section disposed on a sidewall of the slide slot; and at least a second engaging section disposed in a predetermined position on the circumference of the fitting member corresponding to the first engaging section, whereby the second engaging section can be engaged with the first engaging section to locate the fitting member in a position within the slide slot to adjust the position of the drill bit against the grinding wheel.
- 2. The drill bit grinder structure as claimed in claim 1, wherein the first engaging section is a waved leaf spring with a predetermined length, the first engaging section being disposed on the sidewall of the slide slot, the length of the first engaging section being in parallel to the length of the slide slot.
- 3. The drill bit grinder structure as claimed in claim 2, wherein the leaf spring is waved and extends in the lengthwise direction.
- 4. The drill bit grinder structure as claimed in claim 2, wherein the second engaging section is a projecting block formed on a lateral side of the fitting member, the second engaging section having a profile complementary to that of the waved leaf spring.
- 5. The drill bit grinder structure as claimed in claim 2, wherein two ends of the leaf spring are fixed on the sidewall of the slide slot.
- 6. The drill bit grinder structure as claimed in claim 5, wherein the seat body has two end sections respectively projecting from the sidewall of the slide slot, two ends of the leaf spring being inserted in the end sections.
- 7. The drill bit grinder structure as claimed in claim 1, wherein the fitting member has a tubular main body inserted through the slide slot, an annular end plate being disposed at one end of the main body, a face of the end plate facing the arched sideboard, two arched abutting blocks being respectively formed on one face of the end plate for correspondingly abutting against the arched sideboard.
- 8. The drill bit grinder structure as claimed in claim 7, wherein the abutting blocks abut against the face of the arched sideboard and the curvature of the abutting blocks is equal to the curvature of the arched sideboard.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4658549 |
Lockwood |
Apr 1987 |
A |
5620363 |
Hepworth |
Apr 1997 |
A |
6110018 |
Hepworth |
Aug 2000 |
A |