JPH0128681B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric router, and particularly relates to an electric router in which a rotating blade shaft with rotating blades attached to both ends is held in a housing, and a cutting operation in which the rotating blades are switched by rotating the housing through 180 degrees. This relates to an electric router that can perform

A conventional electric router will be explained using a diagram. 1st
The figure is a partial side sectional view. 1 is the flat bit of the rotary blade, 2 is the same bit, 3 is the housing, 4 is the blade cover, 5 is the guide plate that guides and holds the blade cover 4, 6 is the frame, 7 is the lock lever, 8
A bolt engages with the lock lever 7 and holds the housing 3, and at the same time serves as a bearing when the housing 3 rotates. A screw 9 holds the guide plate 5.

In this electric router, when the housing 3 is rotated 180 degrees to switch the rotary cutter up and down, when the lock lever 7 is loosened, the housing 3 is released from the tightening by the bolt 8 and the lock lever 7, and the center of gravity G10 of the housing is released. is arrow 1 in the figure
Rotate in the 0' direction. At this time, forces F _A 13 and F _B 14 are applied to the contact portion 11 between the housing 3 and the bolt 8, and the contact portion 12 between the housing 3 and the frame 6, respectively, causing wear and tear when the housing rotates. On the other hand, there is a gap δ A 15 between the housing 3 and the frame 6 at a position opposite to the contact part 12, and a gap δ _A 15 between the housing 3 and the frame 6 at a position opposite to the contact part 11.
Due to the gap δ _B 16 created between the housing 3 and the bolt 8, play occurs when the housing 3 is rotated through 180 degrees, making it difficult to rotate the housing 3 smoothly.

Furthermore, in this electric router, the guide plate 5 is held on the frame 6 by a screw 9 at one end, so that the blade cover 4 can stably move in the direction of the arrow 17 when the housing 3 rotates 180 degrees. The guide plate 5 needs to be manufactured from a material having sufficient rigidity, which poses a problem of deterioration of operability as the weight of the electric router increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric router which eliminates the above-mentioned difficulties, allows smooth rotation of the housing at all times, is lightweight, and has good operability.

The present invention has a rotary cutting tool attached to both ends to hold a rotating cutting tool shaft and a motor for driving the tool,
and for switching the rotating blades at both ends up and down.
An electric router equipped with a housing that can rotate 180°, characterized in that the central axis of rotation of the housing is supported by two bearings, and the bearings are connected by an elastic cover. Further, a guide rod connected from either one of the bearings serves as a sliding guide for the cutter cover of the rotary cutter.

An embodiment of the present invention will be explained with reference to FIG. FIG. 2 is a partial side sectional view of an electric router according to an embodiment of the present invention, in which the same parts or parts that act in the same way as in FIG. A housing cover having a shape held at 6, 19 is a blade cover that covers the rotary blade, 20 is one bearing when the housing 3 rotates 180 degrees about the rotation center line 26, and 21 is the bearing. A guide rod 20 is screw-fitted at one end and held at the housing cover 18 by a nut 22 at the other end, and 23 is a screw for holding the bearing 20 in the housing cover. The difference from conventional electric routers is that when the housing 3 is rotated 180 degrees to switch the rotary cutter up and down, the lock lever 7 is loosened and the center of gravity G10 of the housing is rotated in the direction of the dotted arrow 10' in the figure. When this happens, in addition to the contact area 12 between the housing 3 and the frame 6 and the contact area 11 between the housing 3 and the bolt 8, a new contact area 27 between the housing 3 and the bearing 20 is created, and the center of gravity of the housing 3 is The rotational force of G10 is shared by the forces F _A 13, F _B 14, and F _C 24 generated at each contact portion, and the force F _C 24 is received by the elastic housing cover 18. That is, since the contact parts 11, 12, and 27 can share the rotational force of the center of gravity G10 of the housing 3, the respective forces F _A 13, F _B 14, and F _C 24 are generated at the contact parts of the conventional electric router. It is possible to reduce the amount of force required, and prevent wear and local breakage of each contact part.
On the other hand, there is a gap δ _A 15 between the housing 3 and the frame 6, and a gap between the housing 3 and the bolt 8.
The gap δ _B 16 created between the housings 3 and 3 also becomes very small, and the housing 3 can rotate smoothly without any looseness. Furthermore, the housing cover 18
is held at one end by the frame 6 with a screw 9,
Since the other end is held in the bearing 20 by the screw 23, it becomes a structure in which both ends are supported, and it is possible to have sufficient structural rigidity without using a highly rigid material, and it is possible to reduce the weight of the electric router. Become. On the other hand, the bearing 20 is provided with a blade cover 1 that requires stable movement in the direction of arrow 25 in the figure when the housing 3 rotates.
9 can be easily installed by screw fitting, and the bearing 20 allows the blade cover 19 to operate stably. In addition,
By connecting and installing the guide rod 21 from the side of the frame 6 that forms the other bearing 28, it becomes possible to perform the same action, and the combined function of stabilizing the operation of the bearing of the housing 3 and the blade cover 19 can be performed as described above. Since the bearings 20 and 28 are provided, the structure around the bearings can be simplified.

As explained above, according to the present invention, it is possible to realize smooth rotation of the housing, improve operability by reducing weight, and achieve excellent industrial effects such as being economical by simplifying the structure. be able to.

[Brief explanation of drawings]

FIG. 1 is a partial side sectional view of a conventional electric router, FIG. 2 is a partial side sectional view of an electric router according to an embodiment of the present invention, and FIG. 3 is a top view of FIG. 2. 1...Hira bit, 2...Available bit, 3...
Housing, 4...Cutter cover, 5...Guidance plate, 6
... Frame, 7 ... Lock lever, 8 ... Bolt, 9 ... Screw, 18 ... Housing cover, 19
... cutler cover, 20 ... bearing, 21 ... guide rod,
22...nut, 23...screw, 28...bearing,
30...window.

Claims (1)

[Scope of Claims] 1. A rotary blade for cutting is attached to both ends to hold a rotating blade shaft and its drive motor, and is rotatable by 180° to switch the rotary blades at both ends up and down. An electric router equipped with a housing, characterized in that the central axis of rotation of the housing is supported by two bearings, and the bearings are connected by an elastic cover. 2. A housing is provided that holds a rotating blade shaft with rotating blades for cutting attached to both ends and its drive motor, and is rotatable by 180° in order to switch the rotating blades at both ends up and down. In the electric router, the central axis of rotation of the housing is supported by two bearings, the bearings are connected by an elastic cover, and the rotating blade is connected by a guide rod connected from one of the bearings. An electric router characterized in that it serves as a sliding guide for a blade cover.