Connection device of boring saw

Details Connection device of boring saw Connection device of boring saw

2000-12-28

2002-03-19

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

C408S206000

Reexamination Certificate

active

06357973

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a boring tool, and more particularly to a connection device of the boring tool.
BACKGROUND OF THE INVENTION
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
.
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
.
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.
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
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.
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.


REFERENCES:
patent: 3758221 (1973-09-01), Meshulam
patent: 5597274 (1997-01-01), Behner
patent: 5658102 (1997-08-01), Gale
patent: 5868532 (1999-02-01), Spenser
patent: 5967709 (1999-10-01), Thuesen
patent: 6120221 (2000-09-01), Alm

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