JPS6119902Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a disc grinder.

Conventionally, a disc grinder is configured to be operated by opening an air supply valve provided at the rear of the grinder main body. According to this grinder, the operator can operate the air supply valve with one hand, and therefore, if the operator is sitting horizontally and performing the grinding work with one hand, or if the operator moves while the grinder is operating, There was a risk of injury to workers.

Therefore, an object of the present invention is to provide a disc grinder that requires the use of both hands to operate.

That is, in order to achieve the above object, the present invention communicates the air supply part of the rotor chamber formed in the grinder main body with the air supply connection end opening provided at the rear of the grinder main body through an air supply pipe line. A main lever that can freely open and close the air supply pipe is provided on the grinder body, an exhaust chamber is formed in the front part of the grinder body that communicates with the rotor chamber exhaust section, and a communication port to the atmosphere is formed in the exhaust chamber. A valve plate that can be opened and closed is provided, and an auxiliary lever for operating the valve plate is provided on the operating handle of the grinder main body.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. 1 is the main body of the disc grinder, with a polishing disc 2 and an operating handle 3 on the front part.
and a polishing disk drive rotor 4 in the center.
It has a rotor chamber 5 containing a rotor, and has an air supply connection end 6 at the rear. At the rear of the grinder body 1, an air supply pipe 8 is formed which communicates the air supply section 5a of the rotor chamber 5 with the opening 7 of the air supply connection end 6. Further, a ball-shaped valve 9 for opening and closing this air supply pipe 8 is built into the front part of the grinder main body 1, and this ball-shaped valve 9 is normally set to the closed position by the biasing force of a compression spring 10, and The main lever 11 attached to the main lever 11 is pushed to the open position. An exhaust chamber 12 communicating with the exhaust section 5b of the rotor chamber 5 is formed in the front part of the grinder main body 1, and a plurality of communication ports 13 to the atmosphere are formed in the outer surface 12a of the exhaust chamber 12. A valve plate 14 is provided within the exhaust chamber 12 and is capable of opening and closing the communication port 13 . That is, the valve plate 14 is configured to be slidable along the outer surface 12a of the exhaust chamber 12, as shown by arrow A, and is formed with a plurality of openings 15 for the communication port 13. . Therefore, when the communication port 13 and the opening 15 match as shown in FIG.
The exhaust section 5b of the rotor chamber 5 communicates with the atmosphere, and when the communication port 13 and the opening 15 are misaligned as shown in FIG. 3, the exhaust section 5b of the rotor chamber 5 is cut off from the atmosphere. and,
The valve plate 14 is actuated by an auxiliary lever 16 attached to the outside of the operating handle 3. That is, the valve plate 14 and the sub-lever 16 are connected to the grinder main body 1.
It is connected by a wire 18 inserted through a through hole 17 formed therein, and has a built-in compression spring 19 that presses and biases the valve body 14 so as to always maintain the closed position. In addition, in Figure 2,
Reference numeral 20 denotes an exhaust passage which covers the outer surface 12a of the exhaust chamber 12 and has an exhaust port 21 formed at a position opposite to the operating handle 3, to prevent exhaust from being exhausted to the operator side.

Next, the operating state will be explained.

While the compressed air a is being supplied to the opening 7 of the air supply connection end 6, the main lever 11 is first actuated to open the air supply pipe line 8. The compressed air a then flows into the rotor chamber 5 through the air supply line 8, but since the exhaust chamber 12 is closed, the compressed air a does not flow and therefore the rotor 4, ie, the polishing disk 2, does not rotate. Next, with the main lever 11 actuated, the sub lever 16 is actuated to open the communication port 1 of the exhaust chamber 12.
Open 3. Then, the compressed air a flows out from the rotor chamber 5 to the atmosphere through the exhaust chamber 12 and the exhaust passage 20, so that the rotor 4 rotates, that is, the polishing disk 2 rotates. In this way, even if only the main lever 11 is actuated, the polishing disk 2 will not rotate, and the main lever 11 will not rotate.
The polishing disk 2 rotates only when the auxiliary lever 1 and the auxiliary lever 16 are operated at the same time.

As described above, according to the disc grinder of the present invention, the polishing disc cannot be rotated unless the main lever provided on the operating handle at the front of the grinder body and the auxiliary lever provided at the rear of the grinder body are operated simultaneously. Therefore, the operator does not have to perform polishing work with one hand.
It's safe.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall side view, FIG. 2 is a sectional view taken in the direction indicated by the - arrow in FIG. 1, and FIG. 3 is a sectional view taken in the direction indicated by the - FIG. 4 is an explanatory diagram of the same operation. 1... Grinder main body, 3... Operation handle, 5... Rotor chamber, 5a... Air supply section, 5b...
Exhaust section, 6... Connection end, 7... Opening, 8... Air supply pipe line, 11... Main lever, 12... Exhaust chamber, 1
2a...Outer surface portion, 13...Communication port, 14...Valve body, 15...Opening, 16...Sub-lever.

Claims (1)

[Scope of utility model registration request] The air supply part of the rotor chamber formed inside the grinder body and the air supply connection end opening provided at the rear of the grinder body are connected through an air supply pipe, and a main lever that can freely open and close the air supply pipe is connected to the grinder main body. established,
An exhaust chamber communicating with the rotor chamber exhaust section is formed in the front part of the grinder main body, and a valve plate is provided to connect the exhaust chamber to the atmosphere, and the communication port can be opened and closed. A disc grinder characterized by being provided with an auxiliary lever for operating the valve plate.