Machining tools having adjustable fences

Details Machining tools having adjustable fences Machining tools having adjustable fences

1999-08-10

2001-07-17

Rada, Rinaldi I. (Department: 3724)

Cutting

With work immobilizer

Work-stop abutment

C083S468700, C083S581000, C083S471300

Reexamination Certificate

active

06260460

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to machining tools, such as circular saws and hollow chisel mortises, having adjustable fences for positioning a workpiece to be machined.
2. Description of the Related Art
A known table saw having an adjustable fence is shown in
FIGS. 8 and 9
. As shown in these figures, a fence
122
is disposed on an upper surface of table
101
and has a flat plate
123
and an upright guide plate
126
, which defines a vertical reference surface
125
for positioning the workpiece. The flat plate
123
has an insertion hole
128
formed in the right side portion as viewed in
FIG. 8. A
guide slot
130
is formed in the flat plate
123
and has an arc-shaped configuration. A first bolt
145
is inserted into the insertion hole
128
and engages a first threaded hole
147
formed in the table
101
, so that the fence
122
can pivot about the first bolt
145
. A second bolt
151
is inserted into the guide slot
130
and engages a second threaded hole
161
formed in the table
101
, so that the fence
122
can be fixed in position relative to the table
101
by tightening the first bolt
151
.
In order to change the pivotal position of the fence
122
to perform a “miter cut” operation, the second bolt
151
is loosened using a tool and the fence
122
is pivoted about the first bolt
145
. The movement of the second bolt
151
along the guide slot
130
guides the position of the fence
122
. After the desired pivoted position has been reached, the second bolt
151
is tightened to fix the fence
122
in the desired pivoted position.
However, in order to change the position of the fence of the known table device, a special tool such as a box wrench is required. In addition, the operator must operate the tool to engage with and disengage from the bolt. Therefore, the known table devices require troublesome operations for changing or adjusting the position of the fence.
SUMMARY OF THE INVENTION
It is, accordingly, one object of the present invention to teach improved machining tools that do not require a tool to adjust the position of the fence.
Preferably, machining tools are taught having a table, an adjustable fence disposed on the table, a fixing device for fixing the position of the adjustable fence and a lever coupled to the fixing device for rotating the fixing device from a fixing position to a releasing position. When the lever is moved to the releasing position, the adjustable fence can freely move relative to the table in order to re-position the adjustable fence. When the lever is moved to the fixing position, the adjustable fence is fixed in position relative to the table. In such a design, a tool is not needed to change the position of the fence relative to the table, thereby simplifying the fence adjusting operation. The lever is preferably disposed below the table, so that the space below the table can be effectively used.
Other objects, features and advantages of the present invention will be readily understood after reading the following detailed description together with the accompanying drawings and the claims.


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