JPS59171Y2 - Safety device for preventing frame separation in routers - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for preventing frame detachment in a router.

In the above-mentioned router, the cutting depth by the cutting blade is adjusted by vertically adjusting the frame, which is positioned and fastened to the base by the tightening mechanism, but if the tightening mechanism forgets to tighten the frame, or If a router is used with insufficient tightening, the frame with the handle attached, which is supposed to be firmly held to a certain base, will vibrate independently of the base or become detached from the base.

Therefore, if the above-mentioned vibration occurs, the cutting tool may break or the machining dimensions may be distorted, resulting in a decrease in machining accuracy.Also, if the cutting tool is used with the cutting tool facing upward, the frame may separate from the base. It was very dangerous to make a diameter hole with the cutting tool supported on the frame.

Therefore, as a result of studies in view of the above-mentioned conventional circumstances, the present invention is a router that has a frame equipped with a cutting tool as a base, and is vertically adjustable and is positioned and fastened using a tightening mechanism.
A novel safety device for preventing frame detachment is provided, which aims to prevent the frame detaching when the tightening mechanism is forgotten to tighten or is insufficiently tightened.

The drawings showing the embodiments of the present invention will be described in detail below.
First, in FIGS. 1 and 2, the router A has a drive unit 3 equipped with a chuck 2 for gripping a cutting blade (not shown) on a drive shaft 1, and is supported within a frame 4.
is fitted into an annular base 6 with a handle 5 attached to the side, and includes a sliding ring 8 screwed into a threaded portion 7 carved on the upper outer periphery of the frame 4, and a part of the base 6. (brackets protruding outward from both sides of the tightening bracket 9) 10.10.
0b, the tightening bolt 11 can be screwed by a tightening lever 12, and a spring 13 urges the tightening lever 12 so that it is fitted and held in the polygonal part 11a of the tightening bolt 11. The frame 4 is tightened and held by the tightening mechanism 14 so as to be movable and adjustable in the vertical direction relative to the base 6.

Here, the above-mentioned tightening mechanism 14 is not limited to the above-described configuration shown in the figure, but a tightening bolt 11 is screwed into both the above-mentioned brackets l-10, 10, and the tightening bolt 11 is screwed with an appropriate tool. It is possible to adopt a structure in which the frame 4 is tightened or loosened by tightening the frame 4, or a structure having any other arbitrary structure.

Thus, the safety device B of the present invention has a horizontal hole 15 penetratingly formed on the side of the peripheral wall 6a of the base 6, and an inner end hemlock fitting 16 is inserted into the horizontal hole 15 either integrally or with a screw 17 made of a separate member. A lock pin 18 provided as a stopper is fitted so as to be slidable in the axial direction, and a lock spring 19 is interposed on the lock pin 18 with its ends supported by the lock fitting 16 and the inner surface of the peripheral wall 6a of the base, respectively. causes an elastic force toward the frame 4 side,
The locking fitting 16 is provided so as to be able to engage with a thread 20 carved in the circumferential direction on the outer wall surface of the frame 4, and at the outer end of the locking pin 18 protruding outward from the horizontal hole 15,
One end of the safety lever 21 is attached to the outer wall surface of the base 6 so as to be swingable with the fulcrum 21a in contact with the outer wall surface of the base 6, and by swinging the safety lever 21, the lock spring 19 is elasticized by the lever action of the lever 21. The lock pin 1B can be pulled outward against repulsive force to release the engagement with the thread 20 of the lock fitting 16.

Here, the lock fitting 16 is formed in a U-shape with a side surface, and both ends 16a, 16a are engaged with the valleys of the thread 20 to prevent the frame 4 from moving in the vertical direction. Therefore, at least a plurality of the threads 20 are installed horizontally within the adjustment range of the cutting depth by a cutting tool (not shown), and this does not necessarily have to be limited to threads, but is simply a thread. Of course, uneven stripes may also be used.

Further, the peripheral wall of the base 6 in which the horizontal hole 15 is provided is bulged outward by an appropriate amount as shown in the figure, so that there is a sufficient distance between the peripheral wall 6a and the outer peripheral surface of the frame 4 to allow the lock fitting 16 to advance and retreat. is provided, and furthermore, the safety lever 21
is bent into a substantially half-crank shape on its side, and uses the bent portion as a fulcrum 21a, and an engagement hole 21b is provided on the distal side of the fulcrum 21a to fit into the lock pin 18. The head part 18a and the latch.

In the above configuration, since the lock fitting 16 and the lock pin 18 are normally elastically biased against the frame 4 by the lock spring 19, the end portion 16 of the lock fitting 16 is
a, 16a are engaged with the thread 20 of the frame 4, and in this state the base end side of the safety lever 21 is held tilted.

Therefore, the frame 4 includes the lock fitting 16 and the lock pin 1.
Since the frame 4 is fixed to the base 6 via the bolt 8, when the frame 4 is locked as described above, even if the frame 4 is forgotten to be tightened by the tightening mechanism 14 or is not tightened sufficiently, Since the frame 4 is prevented from moving in the vertical direction, it will not come off from the base 6.

In addition, when loosening the fastening of the frame 4 by the tightening mechanism 14 and adjusting the frame 4 up and down with respect to the base 6, push the base end of the safety lever 21 and swing it around its fulcrum 21 a. , the lock pin 18 is pulled outward against the elastic force of the lock spring 19, so that the lock fitting 16
is retracted and is disengaged from the thread 20 as shown in FIG. 3, so that the frame 4 can be freely adjusted in the vertical direction.

Further, after adjusting the frame 4, by releasing the pressure on the safety lever 21, the safety lever 21. lock pin 18
The locking fitting 16 is automatically returned to its original position by the locking spring 19, and the locking fitting 16 is engaged with the thread 20 again.

As explained above, according to the safety device for preventing frame detachment in a router according to the present invention, the lock fitting 16 comes into elastic contact with the thread 20 etc. carved on the outer wall surface of the frame 4 in the vertical direction of the frame 4. Because it prevents movement, the tightening mechanism 1
Even if the frame 4 is forgotten to be tightened by the router 4 or is insufficiently tightened, the frame 4 can be prevented from detaching from the base 6, and the safety of the cutting operation by the router can be improved.

Further, by simply pushing the safety lever 21, the locking fitting 16 can be easily disengaged from the thread 20, and when the button is released, the locking fitting 16 can automatically return and locking with the threaded thread 20. When adjusting the vertical movement of the frame 4 with respect to the base 6, the frame 4 is moved to the adjusted position.
can be temporarily fixed, making it easy to adjust the frame up and down.Furthermore, the lock fitting 16 is always held in place by the lock spring 19 unless the safety lever 21 is operated.
Since it locks with the lock fitting 16 and the screw thread 2, there is no need to forget to set it, ensuring safety.
By setting and forming the frame 4 in advance so that there is no looseness when locking the frame 4, even if the frame 4 is forgotten to be tightened or is not tightened sufficiently, not only will it prevent the frame 4 from coming off, but it will also prevent the frame 4 from vertically moving slightly. Therefore, there are many practical effects such as being able to prevent a decrease in machining accuracy due to cutting tools.

[Brief explanation of drawings]

Fig. 1 is a partially sectional front view of a router equipped with a safety device for preventing frame separation according to the present invention;
FIG. 3 is a cross-sectional view taken along the line II--II in the figure, and FIG. 3 is a longitudinal side view showing the operating state of the safety device. 1... Drive shaft, 2... Chuck, 3.
... Drive section, 4 ... Frame, 6 ...
...Annular base, 8...Sliding ring, 9...
...Tightening white, 14...Tightening mechanism, 15...
...Horizontal hole, 16...Lock fitting, 1B...
...Lock pin, 19 ...Lock spring, 2
0...Thread, 21...Safety lever, 2
1 a...Fully point of safety lever, A...
Router B: Safety device to prevent frame separation.

Claims (1)

[Scope of utility model registration request] A router in which a drive shaft 1 is provided with a cutting blade gripping chuck 2, and a frame 4 containing a drive section 3 is positioned and fastened to an annular base 6 by a tightening mechanism 14 so as to be movable in the vertical direction. In A, a horizontal hole 15 is provided on the side of the base.
A lock pin 18 with an inner end locking fitting 16 provided in the horizontal hole is slidably inserted therethrough, and the locking pin 18 is moved in a direction in which the locking fitting can be locked with a thread 20 etc. carved in the circumferential direction of the outer wall of the frame. The lock pin is elastically biased by the lock spring 19 and inserted, and the outer end of the lock pin has a fulcrum 21 relative to the outer wall surface of the base.
A safety device for preventing frame detachment in a router, characterized in that a lock pin is attached to one end of a safety lever 21 so as to be swingable with a lock pin.