U.S. patent application number 09/749396 was filed with the patent office on 2001-05-17 for connection device of boring saw.
Invention is credited to Chao, Walley.
Application Number | 20010001276 09/749396 |
Document ID | / |
Family ID | 26008529 |
Filed Date | 2001-05-17 |
United States Patent
Application |
20010001276 |
Kind Code |
A1 |
Chao, Walley |
May 17, 2001 |
Connection device of boring saw
Abstract
A connection device is, designed to connect a boring saw to a
rotating tool and is formed of a shaft, a locating member, a
sleeve, and a nut. The shaft is provided with a shaft hole to
receive a bit, and a connection portion for fastening the shaft
with the rotating tool, a first outer threaded portion which is
engaged with the nut, and a second outer threaded portion which is
engaged with the inner threaded portion of the rotating body of the
boring saw. The shaft is fitted into the sleeve which is urged by
the nut to press against the rotating body to be fastened securely
with the rotating tool.
Inventors: |
Chao, Walley; (Taichung,
TW) |
Correspondence
Address: |
BROWDY AND NEIMARK, P.L.L.C.
624 NINTH STREET, NW
SUITE 300
WASHINGTON
DC
20001-5303
US
|
Family ID: |
26008529 |
Appl. No.: |
09/749396 |
Filed: |
December 28, 2000 |
Current U.S.
Class: |
408/204 ;
408/238 |
Current CPC
Class: |
B23B 51/0473 20130101;
Y10T 408/895 20150115; Y10T 408/94 20150115; Y10T 408/8957
20150115 |
Class at
Publication: |
408/204 ;
408/238 |
International
Class: |
B23B 051/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 28, 1999 |
TW |
88212647 |
Claims
What is claimed is:
1. A connection device of a boring saw, said connection device
connecting a rotating tool with a rotating body and a bit, the
rotating body having an inner threaded portion and at least one
locating hole, said connection device comprising: a shaft having a
shaft hole for receiving one end of a bit, a connection portion
located at one end of said shaft for connecting the rotating tool,
an urging ring extending radially from a shank of said shaft and
having at least one through hole extending along the longitudinal
direction of said shaft, a first outer threaded portion located
between said connection portion and said urging ring, and a second
outer threaded portion located at a free end of said shaft and
engaged with the inner threaded portion of the rotating body; a
locating member comprising an annular portion fitted over said
shaft, and at least one insertion pin extending longitudinally from
said annular portion to insert into said through hole of said
urging ring and the locating hole of the rotating body; a sleeve
having a closed end which is provided with a through hole to
receive said shaft, said urging ring, and said locating member; and
a nut engaged with said first outer threaded portion of said shaft
such that said nut urges said closed end of said sleeve to be in an
intimate contact with the closed end of the rotating body.
2. A connection device of a boring saw, said connection device
connecting a rotating tool with a rotating body and a bit, the
rotating body having an inner threaded portion and at least one
locating hole, said connection device comprising: a shaft having a
shaft hole for receiving one end of a bit, a connection portion
located at one end of said shaft for connecting the rotating tool,
an urging ring extending radially from a shank of said shaft and
having at least one through hole extending along the longitudinal
direction of said shaft, a first outer threaded portion located
between said connection portion and said urging ring, and a second
outer threaded portion located at a free end of said shaft and
engaged with the inner threaded portion of the rotating body; a
locating member comprising an annular portion fitted over said
shaft, and at least one insertion pin extending longitudinally from
said annular portion to insert into said through hole of said
urging ring and the locating hole of the rotating body; and a
sleeve having a closed end which is provided with a threaded
through hole whereby said threaded through hole is engaged with
said first outer threaded portion of said shaft such that said
sleeve is fitted over said locating member and said urging ring of
said shaft, and that said sleeve urges the closed end of the
rotating body, thereby fastening securely said shaft with the
rotating body.
3. The connection device as defined in claim 2, wherein said closed
end of said sleeve is provided with an embossed portion to provide
friction to facilitate the turning of said sleeve.
Description
FIELD OF THE INVENTION
1. The present invention relates generally to a boring tool, and
more particularly to a connection device of the boring tool.
BACKGROUND OF THE INVENTION
2. As shown in FIGS. 1 and 2, a prior art boring saw comprises a
rotating tool (not shown in the drawings), a rotating body 2, a bit
5, and a connection device 6. The rotating body 2 and the bit 5 are
driven by the rotating tool. The connection device 6 is used to
connect the rotating tool, the rotating body 2, and the bit 5.
3. The rotating body 2 is provided with an inner threaded portion 3
and four locating holes 4. The connection device 6 comprises a
shaft 7, a locating member 15, and a nut 19. The shaft 7 has a
shaft hole 8, a connection portion 9, an urging ring 10 provided
with two through holes 11, a first outer threaded portion 12, and a
second outer threaded portion 13. The locating member 15 has an
annular portion 16 and two insertion pins 17.
4. In combination, the bit 5 is first inserted into the shaft 7
before the inner threaded portion 3 of the rotating body 2 is
engaged with the second outer threaded portion 13 of the shaft 7.
The urging ring 10 of the shaft 7 is urged by the rotating body 2.
The locating member 15 is fitted over the shaft 7 such that the two
insertion pins 17 of the locating member 15 are inserted into the
two through holes 11 of the urging ring 10 and the two locating
holes 4 of the rotating body 2. The nut 19 is engaged with the
first outer threaded portion 12 of the shaft 7 such that the nut 19
urges the locating member 15, which is in an intimate contact with
the urging ring 10. The insertion portion 9 of the shaft 7 is
finally connected with the rotating tool.
5. When the locating hole 4 of the rotating body 2 is corresponding
in location to the through hole 11 of the urging ring 10 of the
shaft 7, so as to facilitate the disposing of the insertion pin 17
of the locating member 15, the rotating body 2 is not necessarily
in an intimate contact with the urging ring 15, thereby resulting
in formation of a gap which is the culprit for causing the rotating
body 2 in motion to sway aside. As a result, the holes bored by
such a boring saw have a rough edge. In addition, the rotating body
2 is vulnerable to severance while in operation.
SUMMARY OF THE INVENTION
6. The primary objective of the present invention is to provide a
connection device capable of connecting securely a rotating tool
with a rotating body of the boring saw.
7. The connection device of the present invention comprises a
shaft, a locating member, a sleeve, and a nut. The shaft comprises
a shaft hole to receive a bit, a connection portion for connecting
the rotating tool, an urging ring having two through holes, a first
outer threaded portion located between the connection portion and
the urging ring, and a second threaded portion which is engaged
with an inner threaded portion of the rotating body. The locating
member comprises an annular portion and two insertion pins. The
sleeve is used to fit over the locating member and the urging ring
of the shaft. The nut is engaged with the first outer threaded
portion for pressing the open end of the sleeve to urge intimately
the rotating body.
BRIEF DESCRIPTION OF THE DRAWINGS
8. FIG. 1 shows an exploded view of the prior art.
9. FIG. 2 shows a sectional view taken along the direction
indicated by a line 2-2 as shown in FIG. 1.
10. FIG. 3 shows a perspective view of a first preferred embodiment
of the present invention.
11. FIG. 4 shows an exploded view of the first preferred embodiment
of the present invention.
12. FIG. 5 shows a sectional view taken along the direction
indicated by a line 5-5 as shown in FIG. 5.
13. FIG. 6 shows a sectional view of a second preferred embodiment
of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
14. As shown in FIGS. 3-5, a connection device 20 embodied in the
present invention is mounted on a boring saw, and is formed of a
shaft 22, a locating member 36, a sleeve 40, and a nut 46.
15. The shaft 22 comprises a shaft hole 24 for receiving a bit 5, a
connection portion 26 located at the bottom end of the shaft 22 for
connecting a rotating tool, an urging ring 28 extending radially
from the shank of the shaft 22 and having two through holes 30
extending along the longitudinal direction of the shaft 22, a
threaded hole 31 in communication with the shaft hole 24, a first
outer threaded portion 32 located between the connection portion 26
and the urging ring 28, a second outer threaded portion 34 located
at the top end of the shaft 22, and an annular slot 35 located
between the connection portion 26 and the first outer threaded
portion 32. The connection portion 26 has an outer edge of a
hexagonal cross section.
16. The locating member 36 comprises an annular portion 38 and two
insertion pins 39 extending upward and vertically from the annular
portion 38.
17. The sleeve 40 has a closed end which is provided in the center
with a round through hole 42. The sleeve 40 is provided in the side
edge with a U-shaped slot 44.
18. The nut 46 is engaged with the first outer threaded portion 32
of the shaft 22.
19. In combination, the bit 5 is inserted into the shaft 22 such
that the bit 5 is fastened by a bolt 48 which is engaged with the
threaded hole 31 of the urging ring 28. The inner threaded portion
3 of the rotating body 2 is engaged with the second outer threaded
portion 34 of the shaft 22 such that the locating hole 4 of the
rotating body 2 is corresponding in location to the through hole 30
of the urging ring 28, and that the rotating body 2 is as close as
possible to the urging ring 28. The locating member 36 is fitted
over the shaft 22 such that the two insertion pins 39 are disposed
in the two through holes 30 of the urging ring 28 and the two
locating holes 4 of the rotating body 2. The locating member 36 and
the rotating body 2 are actuated by the shaft 22 to rotate. The
sleeve 40 is fitted over the shaft 22, the locating member 36, and
the urging member 28. The nut 46 is engaged with the first outer
threaded portion 32 of the shaft 22 such that the nut 46 urges the
sleeve 40 to be in an intimate contact with the rotating body 2.
The nut 46 is secured in place by a C-shaped retaining ring 49
which is disposed in an annular groove 35 of the shaft 22. The
connection portion 26 of the shaft 22 is connected with the
rotating tool.
20. In light of the intimate contact of the sleeve 40 with the
rotating body 2, the rotating body 2 does not sway aside in
relation to the connection device 20. In other words, the rotating
body 2 is securely connected with the rotating tool by the
connection device 20.
21. As shown in FIG. 6, a connection device 50 of the second
preferred embodiment of the present invention is basically similar
in construction to that of the first preferred embodiment described
above, except that the connection device 50 is devoid of the nut 46
and is formed of a shaft 52, a locating member 54, and a sleeve
56.
22. The sleeve 56 has a closed end which is provided at the center
with a threaded hole 58 which is engaged with the first outer
threaded portion of the shaft. The sleeve 56 has an embossed
portion 60 to provide friction to facilitate the turning of the
sleeve 56.
* * * * *