JPS6320490Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used when drilling a hole in a water pipe or gas pipe, for example, and more specifically, when drilling a hole in a pipe without stopping the flow of fluid such as water or gas inside the pipe. The purpose of this invention is to provide a simple, lightweight, compact, and easy-to-operate drilling machine that can reduce the height of the machine body relative to the stroke of the cutting spindle.

As disclosed in Japanese Utility Model Application Publication No. 52-784, conventionally proposed drilling machines of this type have a main shaft with a drilling tool such as a cutter fixed to its tip, and a drilling machine that is mounted on the outer peripheral surface of the main shaft. A key groove is provided in the axial direction, and it is connected to a gear (rotating body) through a key that fits tightly into the key, and rotates together with the gear, and is guided by the key by the operation of the feed mechanism and lowered along the key groove. The machine moves to drill holes in water pipes, etc.

At this time, in order to prevent the fluid from flowing out, an O-ring is attached to the recess provided in the through hole of the spindle's base (bottom plate of the casing), and this is tightly attached to the outer circumferential surface of the spindle. In order to prevent fluid from flowing out of the keyway, the lower end of the keyway does not reach the O-ring installation position when the main shaft is in its lowest position.

Naturally, with the construction as described above, the main shaft is long for the necessary stroke of the drilling machine, and therefore the height of the machine body is also large.

The present invention improves the above points and provides a drilling machine in which the height of the machine body relative to the stroke of the main shaft of the drilling machine is greatly reduced.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1 is a machine base, 2 is an outer casing, and 3 is a lid body. It's stopped.

Reference numeral 4 denotes an electric motor, which is fixed to the machine base 1 together with the outer casing 2, and a pinion 6 is fixed to its drive shaft 5. 7 has a cutter 8 at the bottom end
This main shaft 7 is attached to the machine base 1 in a detachable manner.
It passes through an insertion hole 20 bored approximately in the center of the
An O-ring 40 is fitted into a recess 30 formed in the inner peripheral surface of the insertion hole 20 so as to tightly contact the outer peripheral surface of the main shaft 7.

9 is a gear that meshes with the pinion 6; 10 is an intermediate shaft; the upper end of this intermediate shaft 10 is connected to the lid 3;
The lower ends of each are rotatably supported on the machine base 1, and the main shaft 7 is slidably inserted into the center, and the main shaft 7 is inserted into the key groove 11 provided in the axial direction on the side wall. An L-shaped key member 12 screwed to the upper end is slidably fitted, and a gear 9 is fixed to the lower end.

13 is a bearing ring, and this bearing ring 13 is connected to the intermediate shaft 10.
The insertion groove 1 of the protrusion 12a of the key member 12 is slidably fitted on the outer periphery of the key member 12 and screwed to the main shaft 7 at the lower part.
4 is provided. Reference numeral 15 denotes a bearing housing, and this bearing housing 15 rotatably mounts the bearing ring 13, and has a screw hole screwed into a feed screw 16 rotatably attached to the bottom plate of the outer housing 2 and the lid 3. 17 are provided. 18 is a handle for rotating the feed screw 16.

The operation of the drilling machine of the present invention constructed as described above will now be described. In FIG. 1, when the electric motor 4 is operated, the drive shaft 5 of the electric motor 4 rotates, and the pinion 6 fixed to the drive shaft 5 also rotates.
When the pinion 6 rotates, the gear 9 meshing with it rotates, and the intermediate shaft 10 to which the gear 9 is fixed rotates. This rotation of the intermediate shaft 10 causes the key member 12 fitted in the key groove 11 provided on the side wall of the intermediate shaft 10 to
Since the main shaft 7 to which the main shaft 7 is screwed also rotates, the cutter 8 fixed to the lower end of the main shaft 7 rotates.

At this time, when the handle 18 is rotated, the feed screw 16
rotates, so the bearing housing 15 descends downward.

This bearing housing 15 has a protrusion 12a of the key member 12.
Since the bearing ring 13 engaged with the key member 12 is rotatably inserted, the main shaft 7 to which the key member 12 is screwed rotates and descends together with the bearing casing 15, and the cutter 8 fixed to the main shaft 7 removes the object. It is possible to drill holes in the hole. If the handle 18 is rotated in the opposite direction, the main shaft 7 will rise together with the cutter 8.

As described above, in the drilling machine of the present invention, the gear 9 that meshes with the pinion 6 is fixed to the lower part of the intermediate shaft 10, which is rotatably supported on the lid 3 at the upper end and on the machine base 1 at the lower end, and is attached to the side wall. An axial keyway 11 is provided, the main shaft 7 is slidably inserted into the center thereof, and a key member 12 screwed to the upper end of the main shaft 7 is slidably inserted into the keyway 11 of the intermediate shaft 10. Since the structure is configured to fit, the height of the machine body relative to the stroke of the main shaft 7 is adjusted when the main shaft is in the lowest position to prevent fluid from flowing out from the keyway during drilling, as in the conventional case. Compared to systems that require a long spindle so that the lower end of the keyway does not reach the O-ring mounting position, the width can be reduced significantly, limiting the space available at the drilling location. The main shaft with a cutter at the bottom end is supported stably from the outside by the intermediate shaft as it descends, so there is no lateral vibration against water pipes, gas pipes, etc. This has the effect of making extremely accurate drilling possible.

The present invention is practical and convenient in these respects.

[Brief explanation of drawings]

The drawings show the drilling machine of the present invention, in which Fig. 1 is a side sectional view, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a cross-sectional view taken along line A-A in Fig.
The figure is an exploded perspective view of the main shaft and intermediate shaft, and FIG. 4 is a side sectional view during operation. 1...Machine base, 2...Outer casing, 3...Lid body, 4...
Electric motor, 5... Drive shaft, 6... Pinion, 7...
Main shaft, 8...Cut, 9...Gear, 10...Intermediate shaft, 11...Keyway, 12...Key member, 12a
... Protrusion, 13 ... Bearing ring, 14 ... Insertion groove, 1
5... Bearing housing, 16... Feed screw, 17... Screw hole, 18... Handle, 20... Insertion hole, 30... Recess, 40... O-ring.

Claims (1)

[Scope of utility model registration request] A pinion 6 fixed to the drive shaft 5 of the electric motor 4,
A rotatable intermediate shaft 10 to which a gear 9 that meshes with the pinion 6 is fixed, and a key member 12 that engages with a key groove 11 provided on the side wall of the intermediate shaft 10 are screwed to the upper end thereof. A main shaft 7 that is slidably fitted into the main shaft 7 and has a cutter 8 that is detachably attached to the lower end of the main shaft 7.
and the protrusion 1 of the key member 12 screwed to the main shaft 7.
A bearing ring 13 is fitted onto the intermediate shaft 10 by locking the bearing ring 2a into its insertion groove 14, and a bearing housing 15 into which the bearing ring 13 is rotatably inserted and which is moved up and down by a feed screw 16.
The drilling machine also has an O-ring 40 fitted in a recess 30 bored in the inner peripheral surface of the insertion hole 20 of the machine base 1 through which the main shaft 7 passes, so as to fit tightly onto the outer peripheral surface of the main shaft 7.