JPS628970Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a floating device for a drilling machine.

For example, a drilling machine is generally used to cut the upper surface of a test specimen subjected to a balance test using a balance tester and correct the unbalance. In order to press the drill of a drilling machine directly onto the top surface of the test specimen subjected to the balance test and cut it, it is necessary to prevent the thrust applied to the drill from being transmitted to the testing machine.

This invention provides a simple floating device for counterbalancing the thrust force applied to the drill with its reaction force. In particular, this idea consists of an inner cylinder and an outer cylinder that are fitted together in a double cylinder shape so that the support of the drilling machine can expand and contract.The upper end of the outer cylinder is fixed to the main body of the drilling machine, and the lower end of the inner cylinder is supported. Fix it to the base. The main body of the drilling machine is elastically supported against the inner cylinder by a coil spring housed in the inner cylinder.
Furthermore, a support arm is fixed to the outer cylinder, which is placed below the drill of the drilling machine so as to face it. Therefore, when cutting the upper surface of a workpiece with a drill, the main body and outer cylinder of the drill float due to the reaction force of the thrust applied to the drill, and the support arm engages with the lower surface of the workpiece. This allows the thrust force applied to the drill to be offset by the reaction force.

Embodiments of this invention will be described below with reference to the drawings.

In FIG. 1, the main body 1 of the drilling machine is supported by a support 2. As shown in FIG. The support column 2 is composed of an inner tube 3 and an outer tube 4 which are fitted in a double tube shape so as to be expandable and retractable, and the inner tube 3 and the outer tube 4 are slidably guided by a bush 5. The upper end of the outer cylinder 4 is fixed to the main body 1 of the drilling machine, and the lower end of the inner cylinder 3 is fixed to a support base 7 via a table 6. The coil spring 8 is housed in the inner cylinder 3, and its upper end is engaged with the main body 1, and its lower end is engaged with the spring receiver 9. The spring receiver 9 is screwed onto a threaded rod 12 which is pivotally supported by a sleeve 11 through a bush 10, and the sleeve 11 is fixed to the inner circumferential surface of the inner cylinder 3.
Therefore, the main body 1 of the drilling machine is elastically supported by the inner cylinder 3 by the coil spring 8. Further, an adjustment knob 13 is fixed to the threaded rod 12 in order to adjust the elasticity of the coil spring 8. When the adjustment knob 13 is turned to rotate the threaded rod 12, the spring receiver 9 is guided by a key groove 14 formed on its outer circumferential surface and a key 15 fixed to the inner circumferential surface of the inner cylinder 3, and the threaded rod 12 It moves in the axial direction by the screw feeding action. Therefore, the elasticity of the coil spring 8 can be adjusted.

A drill 16 of the drilling machine is fixed to a slide shaft 17 slidably mounted on the main body 1.
The support arm 18 is arranged below the drill 16 so as to face it, and is fixed to the outer cylinder 4 by a support fitting 19. Further, in this embodiment, a swing adjustment plate 20 is fixed to the support metal fitting 19, and a pin 22 is inserted into the slot 21 of the swing adjustment plate 20. pin 2
2 is fixed to the table 6. slot 21
As shown in FIG. 2, is formed in an arc shape over a certain angular range. Therefore,
The plate 20, the mounting bracket 19, and the outer cylinder 4 can be rotated relative to the inner cylinder 3. Pin 22 limits its rotation within a certain angular range.

In the drilling machine floating device configured as described above, by rotating the plate 20, the metal fitting 19, and the outer cylinder 4, the drill 16 and the support arm 18 can be caused to perform a so-called neck vibration motion. Therefore, for example, the test specimen, that is, the workpiece T that has been subjected to a balance test using a balance tester, can be easily drilled 16.
and the support arm 18.

When the slide shaft 17 of the drilling machine is lowered to apply thrust to the drill 16 and the drill 16 is pressed against the workpiece T, the reaction force acts on the main body 1. This causes the main body 1 and the outer cylinder 4 to float. The inner cylinder 3 and bush 5 guide the outer cylinder 4, and the coil spring 8
acts to push up the main body 1. Support arm 1
8 rises integrally with the outer cylinder 4 and engages with the lower surface of the workpiece T. Therefore, when further thrust is applied to the drill 16, the thrust is transferred from the support arm 18 to the outer cylinder 4.
The reaction force transmitted to the body 1 and acting on the main body 1 is canceled out.
Therefore, the thrust applied to the drill 16 is not transmitted to the balance tester. The drill 16 is the workpiece T
Cut the top surface of and correct the imbalance.

In addition to the above-mentioned embodiments, various modifications of this invention can be considered. For example, as shown in FIGS. 3 and 4, the support base 7' may be rotatably supported around a column 24 attached to a bracket 23, and the bracket 23 may be fixed to the side wall of the balance tester 25. good. In this embodiment, the entire device is supported by a support base 7'.
The drill 16 and the support arm 1 can be rotated around the support 24 integrally with the support arm 1.
8 in a neck vibration motion, and its position can be adjusted to a large extent. The rotation of the support base 7' is limited by the pin 26 within a certain angular range.

As explained above, this invention can offset the thrust force applied to the drill with its reaction force.
Therefore, no thrust is transmitted to the balance test machine, and the test machine is not subjected to thrust and is not damaged. In particular, in this invention, the support 2 of the drilling machine is constituted by an inner tube 3 and an outer tube 4, so that the main body 1 can be accurately supported by the inner tube 3, the outer tube 4, and the coil spring 8.
The inner tube 3 and outer tube 4 can be expanded and contracted smoothly,
There is no so-called "cold". As a result, drill 1
6 can be completely canceled out by the reaction force.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of this invention, Fig. 2 is a plan view of the swing adjustment plate of Fig. 1, and Fig. 3 is a plan view of the swing adjustment plate of Fig.
The figure is a side view showing a modification of figure 1, and figure 4 is a side view of a modification of figure 3.
It is an enlarged sectional view of a part of the figure. 1... Main body, 2... Support, 3... Inner cylinder, 4...
Outer cylinder, 7, 7'...Support base, 8...Coil spring, 16...Drill, 18...Support arm.

Claims (1)

[Scope of utility model registration request] The support of the drilling machine is composed of an inner cylinder and an outer cylinder that are fitted in a double cylinder shape so that they can expand and contract, and the upper end of the outer cylinder is fixed to the main body of the drilling machine, and the lower end of the inner cylinder is fixed to the support base. The main body is elastically supported on the inner cylinder by a coil spring housed in the inner cylinder, and a support arm disposed below and facing a drill of a drilling machine is fixed to the outer cylinder. When the upper surface of the workpiece is cut with the drill, the main body and the outer cylinder are levitated by the reaction force of the thrust applied to the drill, the support arm is engaged with the lower surface of the workpiece, and the A floating device for a drilling machine, characterized in that thrust force cancels out the reaction force.