JPS5892501A - Electric rooter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 by 180'. Here are 5 related to electric routers that can be used.

A conventional electric router will be explained with reference to a diagram. Figure 1 is a partial side i-side view. 6, 1 is a rotary blade bit, 2
are the same bits, 3 is the housing, 4 is the blade cover,
5 is an i inner plate that guides and holds the knife cover 4, 6H frame;
7 is a bolt that engages with the lock lever 7 to hold the housing 3 and at the same time serves as a bearing when the housing 30 rotates; 9 is a screw that holds the guide plate 5;

In this electric router, when the housing 3 is rotated 180''' to switch the rotary cutter up and down, when the lock lever 7 is loosened, the nozzing 3 is released from the tightening by the bolt 8 and the lock lever 7. The center of gravity G10 of the housing rotates in the four directions of the arrows in the figure.At this time, the contact portion u1 between the housing 3 and the bolt 8 and the
- The problem is that forces FA13 and Th14 are applied to the contacting portion L2 between the housing 3 and the frame 6, respectively, resulting in abrasion and local breakage when the housing rotates.On the other hand, the housing 3 Due to a gap δ^6 generated between the housing 3 and the frame 6, and a gap δB16 generated between the housing 3 and the bolt 8 at a position opposite to the contact portion 11, play occurs when the housing 3 is rotated by 180c'. Therefore, it was difficult to rotate the housing 3 smoothly.

Further, in this electric router, the guide plate 5 is connected to the frame 6.
Since only one end of the guide plate 5 is held by a screw 9, the guide plate 5 is made of a material with sufficient rigidity so that the blade cover 4 can stably move in the direction of the arrow 17 when the housing 3 rotates 180 degrees. However, there was a problem in that the increase in weight of the electric router resulted in deterioration in operability.

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

In the present invention, a housing is provided which holds a rotating blade shaft with rotating blades for cutting attached to both ends and a motor for driving the blade, and which can rotate 1800 times in order to switch the rotating blades at both ends up and down. The electric router according to the present invention is characterized in that the co-biased central shaft of the housing is supported by two bearings, and the bearings are connected by an elastic mouth-shaped cover, and further includes: The blade cover of the rotary blade is slidably guided by a guide rod connected from either one of the blades.

An embodiment of the present invention will be explained with reference to FIG. FIG. 2 is a partial side cross-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 manner as in FIG. 6 is a mouth-shaped housing cover held at 6, 19 is a blade cover that covers the rotating blade, 20 is one bearing when the housing 3 rotates 180'' about the rotation center line A; 21
has one end screwed into the bearing 20 and the other end screwed into the nut 22.
A guide rod 23 held in the housing holder 18 at
indicates a screw holding the bearing member to the housing cover.

The difference from conventional electric routers is that when the housing 3 is rotated 180 degrees in order to switch the rotary cutter up and down, the lock lever 7 is loosened and the center of gravity G10 of the housing rotates in the direction of the dotted arrow in the figure. When attempting to do so, in addition to the contact area 1.1 between the housing 3 and the frame 6, and the contact area 1.1 between the housing 3 and the bolt 8, a new contact area 27 between the housing 3 and the bearing is created. The rotational force ↓ of the center of gravity G10 of the housing 3 is shared by FA13, FB14, and FaZ4 generated at each contact portion, and the force Fc24 is received by the elastic cover member. That is, since the rotational force of the center of gravity GlO of the housing 3 can be shared by the contacts 411, 121, 27, the respective forces Fm1
3yB14 and Fc24 can reduce the force generated at the contact parts of conventional electric routers, and can prevent wear and local breakage of each contact part. On the other hand, the gap δ116 created between the housing 3 and the frame 6 is also very small, and the housing 3 rotates smoothly without any play when the housing 3 rotates. movement becomes possible. Further, one end of the housing cover member is held by the frame 6 with a screw 9, and the other end is connected to the shaft -+.
Since it is held in W by the screw 23, it has a structure in which both ends are supported, and it can have sufficient structural rigidity without using a material with high rigidity, and the weight of the electric router can be reduced.

- Force A guide rod 21 can be easily installed in the bearing 20 by screw fitting to guide the blade cover 19, which requires stable movement in the four directions of the arrows in the figure when the housing 3 rotates. The bearing 20 can perform stable operations of 19. 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 function, thereby achieving the combined function of stabilizing the operation of the bearing of the housing 3 and the blade cover 4. Since the bearing 26 has K, the structure around the bearing 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 the drawing]

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. l 0. Hirabit, 20. Yes bit, 3. . Housing, 41. Knife cover, 50. Information board, 69.
frame, 70. Lotsukure, <-180, Boyato, 96
．． Screw, 180. housing cover, 19. . Knife cover, title 0. bearing, 210. Guide rod, 220. Nut) 23...Screw 128...Bearing, 30...Window O Patent applicant's name Hitachi Koki Co., Ltd. Procedural amendment (method) Showa t2, month Z day 2 Name of the invention Electric router 3 Person making the amendment Relationship to the case Patent applicant

Claims (1)

[Scope of Claims] 11. 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° in order to switch the rotary blades at both ends up and down. An electric router equipped with a housing is characterized in that the central axis of rotation of the housing is supported by two bearings, and the bearings are connected by an elastic N-shaped cover. 4. A housing is provided that can rotate by 180c to hold a rotating cutting tool shaft and its drive motor with rotating cutting tools attached to both ends, and to switch the rotating cutting tools 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 mouth-shaped groove, and a guide rod connected from one of the bearings is used to support the rotation axis of the housing. An electric router characterized in that it serves as a sliding guide for a blade cover of a rotating blade.