JPH0244962Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a safety cover for a tabletop circular saw, and particularly relates to a safety cover for a tabletop circular saw in which the swinging fulcrum of the safety cover is provided at the rear of the saw cover. It is something.

[Background of the idea]

In the field of so-called tabletop circular saws, where the material to be cut is lowered to cut the material placed on the table, the saw is exposed from the saw cover as shown in Figure 1. It is becoming common to have a structure in which the circular saw part is protected with a safety cover so that unnecessary part of the circular saw part is not exposed for safety reasons when not working or during work.

Conventionally, there is Utility Model No. 57-56815, which is a tabletop circular saw equipped with a safety cover locking means.

A plate member having an upright portion and an inclined wall is fixed to the hinge. A plate made of a leaf spring is fixed to the saw cover that covers the upper half of the circular saw, and a locking pin is inserted into and out of the hole drilled in the saw cover at the upper end of the plate made of leaf spring. It is set freely.

In addition, the safety cover covers the lower half of the circular saw.
It is provided so as to be swingably inserted into the saw cover using the front of the saw cover as a fulcrum.

When the saw device is at the upper limit position, the locking pin protrudes above the rear of the safety cover inside the saw cover, so even if you try to swing the safety cover upwards, the locking pin will come into contact with it and prevent it from swinging. It is something to prevent.

When the saw device is lowered, the leaf spring plate moves toward the inclined wall of the plate member, so the upper end of the leaf spring plate moves forward and at the same time the locking pin also moves forward. Since the locking pin is not located above the safety cover (it comes out from inside the saw cover), the safety cover 10 becomes swingable.

However, with this locking device, if the safety cover swings upward when the pin moves due to the lowering of the saw device, the pin has not yet completely come out of the saw cover, so the safety cover comes into contact with the pin, and the safety cover The rocking motion becomes impossible.

That is, since the abutting relationship between the pin and the safety cover is released (moved) when the saw device is lowered, a space must be provided between the pin and the safety cover. If there is a gap, the saw device will not be completely locked when it is in the upper limit position, and the safety cover will always swing slightly. Therefore, there is a possibility that a worker may come into contact with the circular saw, making it an incomplete safety device.

In addition, by providing a sliding part between the leaf spring plate and the plate member, the locking pin moves in and out of the hole, resulting in a complicated structure and the drawbacks of being prone to wear and lacking durability. I will have it.

[Purpose of invention]

The purpose of the present invention is to eliminate the problems of the conventional technology described above, improve the safety of tabletop circular saws by placing the swinging fulcrum of the safety cover at the rear of the saw cover, and at the same time provide an inexpensive and durable lock. The purpose is to provide equipment.

[Summary of the idea]

This invention provides a fulcrum at the rear of the saw cover that covers almost the upper half of the circular saw, and in a tabletop circular saw that has a safety cover that swings around this fulcrum, when the circular saw is lowered, the circular saw The swinging fulcrum of the safety cover also lowers along with the drive shaft,
Focusing on the fact that the rotation locus of the safety cover changes due to the lowering of the swing fulcrum, the relationship between the lock position of the safety cover and the change in the rotation locus has been devised.

[Example of idea]

An embodiment of the present invention will be described with reference to FIGS. 2 and 3.

The overall configuration of a tabletop circular saw will be explained with reference to FIG.

Note that FIG. 1 shows a state in which the saw device 14 is at the upper limit position.

1 is the base. Round table 2 on base 1
is provided so as to be rotatable in the horizontal direction. Also,
The top surface of the round table 2 is arranged so as to be substantially horizontal to the top surface of the base 1. A fence 3 having a wall surface perpendicular to the top surface of the base 1 and the top surface of the round table 2 is fixed to the top surface of the base 1. That is, the base 1, the round table 2, and the fence 3 form a support surface for the material 13 to be cut. 4 is the hinge, which is the round table 2
Fixed to the bottom. Therefore, when the hinge 4 is rotated horizontally, the round table 2 and the saw device 1
4 will rotate together in the horizontal direction.
This rotational movement in the horizontal direction is performed when giving an arbitrary angle to the cut surface of the material to be cut.

On the other hand, a first fulcrum 5 provided at the rear upper end of the hinge 4 supports a saw device 14 that moves up and down with respect to the top surface of the table about the first fulcrum 5 .

The saw device 14 includes a circular saw 8 that is rotationally driven by a drive shaft 15 (hereinafter also referred to as a second fulcrum);
A saw cover 7 that covers almost the upper half of the circular saw 8, and a circular saw portion that rotates around a third fulcrum 10 provided at the rear of the saw cover 7 and is exposed from the saw cover 7. a safety cover 9 for guarding the saw device 14, and a handle 6 for vertically moving the saw device 14.
etc. are provided.

FIG. 2 is a front view showing an embodiment of a table-top circular saw equipped with a locking means according to the present invention, in which a state in which the saw device 14 is at the upper limit position is shown by a solid line, and a state in which the saw device 14 is lowered is shown. The two-dot chain line indicates the current state. FIG. 3 is an enlarged vertical sectional view taken along the line C--C in FIG. 2.

A protrusion 12 is formed on the side surface of the safety cover 9. In this embodiment, the protrusion 12 is L
It is formed by screwing a letter-shaped plate member to the side surface of the safety cover 9. On the other hand, one end of a stopper arm 11, which is a restraining member, is fixed to the hinge 4 extending from the table side, and the other end is fixed to a protrusion 1 when the saw device 14 is at the upper limit position.
It is installed so as to engage with the upper surface of 2.

In the above configuration, to explain the operation of the safety cover, the saw device 14 is at the upper limit position (second
(indicated by a solid line in the figure), the protrusion 1
Since the stopper arm 11 is present above 2, even if a force is applied to move the safety cover 9 upward, the raised movement of the safety cover 9 is completely prohibited due to the abutment between the protrusion 12 and the stopper arm 11.

Next, the saw device 14 is centered around the first fulcrum 5.
When the circular saw is lowered, the drive shaft 15 of the circular saw and the swing fulcrum 10 of the safety cover 9 naturally
will fall as shown by the two-dot chain line. Due to this downward movement, the protrusion 12 is at the upper limit position.
The rotation trajectory of the protrusion 12 was drawn centered on the fulcrum 10 shown by the solid line, but when it enters the downward state, the rotation trajectory of the protrusion 12 is drawn centered on the fulcrum shown by the two-dot chain line. Therefore, the protrusion 12 is in a state where it can freely swing without being hindered by the stopper arm 11 from rotating.

[Effect of idea]

As described above, according to the present invention, a saw device is provided at a first fulcrum placed at the rear of the table and moves up and down with respect to the top surface of the table about this fulcrum,
The saw device includes a second fulcrum that serves as the drive shaft of the circular saw, a saw cover that covers almost the upper half of the circular saw, and a third fulcrum that is provided at the rear of the saw cover. Further, in the tabletop circular saw equipped with a safety cover that protects a circular saw portion exposed from the saw cover, a protrusion is formed on a side surface of the safety cover, and a protrusion is formed on the table side. By fixing the engageable restraining member, when the saw device is at the upper limit position, the raising movement of the safety cover is completely prohibited by engagement between the protrusion and the restraining member;
When the saw device is lowered, the third fulcrum is lowered as the second fulcrum is lowered, and the downward movement of the third fulcrum allows the protrusion to rotate without being hindered by the restraining member. This creates a trajectory and allows the safety cover to swing freely.

In other words, the safety cover cannot swing upward except during cutting work, which prevents the circular saw from being exposed and prevents unexpected accidents, improving safety. Since the safety cover is prevented from swinging upward by engagement with the restraining member, there is no part that wears out, and a locking device with an inexpensive, compact structure and excellent durability can be provided.

[Brief explanation of the drawing]

Figure 1 is a front view showing a conventional example of a tabletop circular saw in which the swing fulcrum of the safety cover is provided at the rear of the saw cover, and Figure 2 is a front view of a tabletop circular saw equipped with the locking means of the present invention. FIG. 3 is a front view showing the embodiment, and FIG. 3 is an enlarged sectional view taken along the line C--C in FIG. 2. In the figure, 7 is a saw cover, 8 is a circular saw, and 9 is a saw cover.
is the safety cover, 11 is the stopper arm, 12
indicates a protrusion.

Claims (1)

[Claims for Utility Model Registration] A first fulcrum placed at the rear of the table is provided with a saw device that moves up and down with respect to the top surface of the table centering on the first fulcrum, and the saw device is provided with a saw device that serves as a drive shaft for a circular saw. a second fulcrum, a saw cover that covers approximately the upper half of the circular saw, and a portion of the circular saw that swings around a third fulcrum provided at the rear of the saw cover and is exposed from the saw cover. In a tabletop circular saw equipped with a safety cover that guards the saw, a protrusion is formed on the side surface of the safety cover, and a restraining member that can engage with the protrusion is fixed to the table side. When the saw device is at the upper limit position, the raised portion of the safety cover is prohibited by the engagement of the protrusion with the restraining member, and when the saw device is lowered, the third fulcrum is lowered as the second fulcrum is lowered. The safety cover for a tabletop circular saw is characterized in that the downward movement of the third fulcrum creates a trajectory in which the protrusion can rotate without being hindered by the restraining member.