KR200214805Y1 - A hand work useing grinder - Google Patents

Abstract

This device is designed to make the hand-held grinder with a good grinding force and to reduce the volume, making it compact and easy to use and increase the grinding efficiency.

The grinding machine has a power transmission unit inside the handle case and is configured to receive power by a cable from an external motor, wherein the power transmission unit has an input shaft portion and an output shaft portion to which the cable is connected, and a rotating shaft installed to be supported by a bearing; Is configured to be directly connected to the power conversion unit by the eccentric shaft portion protruded eccentrically to the output shaft portion, the bearing is coupled,

The power conversion unit supports the rod shaft and the rod shaft is installed in the middle to allow the left and right reciprocating movement of the left and right movement rod having an input end having an eccentric shaft portion is inserted and the output end combined with the grinding wheel Consists of a bearing housing with a bearing to smooth the movement of the lateral movement rod, and provides a manual grinding machine with a large grinding force and a small volume and size.

Description

A hand work useing grinder}

The present invention relates to a hand grinding machine for use by hand, and more particularly, to a hand grinding machine that has excellent grinding power and is further miniaturized.

Generally, grinding grinder is a grinding machine for sharpening metal surface, and there is a mechanical grinding machine that grinds the workpiece by turning the grinding wheel into a machine. As mentioned in the introduction, a hand grinder is used to hold the grinding machine by hand and grind the workpiece. Being separated.

The present invention relates to a manual grinding machine, and in the following description, a grinding machine means a manual grinding machine.

Thus, a grinding machine has been conventionally known, and a representative prior art grinding machine is shown in FIG. Referring to this figure, the grinding machine 1 has a handle case 2 that can be held by hand, and has a structure in which a motor 3 is installed therein.

In addition, the motor 3 shaft 3a has a configuration in which the eccentric shaft 4 is connected so as to be eccentric with it, so that when the motor 3 is driven, the eccentric shaft 4 is rotated in a circular shape when viewed from the front. have.

On the other hand, in front of the eccentric shaft (4) is provided a left and right movement rod (6) in which the front end portion (6a) and the rear end portion (6b) reciprocate left and right about the fixed shaft (5).

Accordingly, the left and right movement rods 6 are formed by the eccentric rotation of the eccentric shaft 4 by allowing the eccentric shaft 4 to be inserted and rotated in the groove portion 6c at the rear end 6b of the left and right movement rod 6. ), The rear end 6b of the) is reciprocated in the left and right directions, whereby the tip 6a in front of the fixed shaft 5 also reciprocates in the left and right directions.

Therefore, the grinding wheel 7 fixed to the end of the tip portion 6a of the left and right movement rod 6, which is exposed to the front of the handle part case 2, which also serves as a grinding machine case 1, continuously reciprocates in the left and right directions. In this way, the workpiece is used to be ground by the grinding wheel (7) is reciprocated left and right.

However, the above-described prior art grinding machine 1 cannot enlarge the handle case 2 indefinitely. That is, there is a limit to having a size that can be held by hand. For example, if the size of the handle case 2 is large enough to be difficult to grasp by hand, the state of holding the grinding machine is in an unstable state, thereby bringing instability of the grinding operation.

That is, since the grinding machine 1 of the prior art cannot enlarge the handle case 2, there is a limit in that the motor 3 embedded therein also cannot use a large one. In addition, the motor 3 has a state in which the capacity is small when the size is small and, on the contrary, the size is proportionally large when the capacity is large.

Therefore, the motor 3, which is embedded in the handle case 2, as in the grinding machine 1 of the prior art, has to be built with a small size, so that the small capacity is installed, and the small capacity means that the motor ( It means that the driving force of 3) is weak.

Therefore, the grinding force of the grinding wheel that grinds the workpiece by the power of the motor (3) with weak driving force is inevitably weak, resulting in low grinding efficiency.

Further, in the grinding machine 1 of the prior art, only a small capacity of the motor 3 cannot be used, and a motor 3 having a force capable of grinding to some extent should be employed. Therefore, in employing the actual motor (3) is adopted a motor (3) having a larger size to hold by hand, thereby increasing the volume of the handle case (2) there is a problem inconvenient to hold by one hand.

That is, the grinding machine of the prior art has a drawback in that the volume is relatively large and the grinding force (force) is small, and therefore, the inconvenience of grinding and the grinding efficiency are poor.

In addition, since the vibration of the whole grinding machine 1 is large due to the built-in motor 3 having a lot of vibration, there is a problem in that a failure rate and a long life are shortened.

The present invention has been made in view of the above-mentioned problems in the related art, and an object of the present invention is to provide a grinding machine for a hand, in which grinding force (force) is increased, volume (size) is small, and structural life is increased.

The present invention is characterized in that it provides a manual grinding machine having a power transmission unit for transmitting the power transmitted from the outside without power loss in the grinding machine in order to achieve the above object.

In addition, while transmitting the power transmitted by the power transmission to the grinding wheel at the same time there is a feature that has a power switching unit having a durability while switching the rotational movement of the power transmission to the left, right reciprocating motion.

1 is a configuration diagram of a grinding machine according to the prior art,

2 is a schematic view illustrating a grinding machine and its driving relationship according to the present invention;

3 is a perspective view of a grinding machine according to the present invention,

4 is an exploded perspective view of the grinding machine according to the present invention,

5a and 5b is a longitudinal cross-sectional view illustrating the operation of the grinding machine of the present invention,

FIG. 6 is an enlarged cross-sectional view taken along the line AA ′ of FIG. 5A.

<Explanation of symbols for main parts of drawing>

10 grinding machine 11 motor 13 cable

13A: hose 14: handle case 15: exhaust hole

16 inlet hole 20 power transmission unit 21 rotation shaft

22, 22 ': Bearing 23: 휀 24: Eccentric Shaft

25: bearing 30: power switching unit 31: left and right movement rod

32: long hole 33: rod shaft 34: bearing

35: bearing housing 40: grinding wheel

When described in more detail on the basis of the preferred embodiment attached to the grinding machine according to the present invention.

2 shows the overall configuration of the grinding machine 10 according to the present invention.

The grinder 10 is to be powered from the outside, the motor 11 to provide power in this way is provided and provided separately from the grinding machine (10).

A power transmission cable (also called a motor cable) 13 for power transmission is connected to the motor shaft 12 of the motor 11.

The power transmission cable 13 is a cable having a length long enough not to interfere with the grinding operation by holding the grinding machine 10 by hand, and a flexible cable that can be bent, and a cable hose for safety on the outside thereof ( 13a) is to be covered.

Accordingly, when the motor 11 is driven, the power transmission cable 13 connected to the motor shaft 12 is rotated, and the rotational force is transmitted to the power transmission unit 20 inside the grinder 10.

4 and 5A, the power transmission cable 13 is connected to the input shaft portion 21a at the end of the rotation shaft 21 of the power transmission portion 20.

The power transmission unit 20 is to be installed inside the handle case 14 also serves as the case of the grinding machine 10, the handle portion 14 is divided into upper and lower handle portions (14a) (14b), These have a threaded portion 14c so that they can be fastened and separated from each other.

The rotating shaft 21 is installed in the handle case 14 so as to be supported by the bearings 22 and 22 ', and they are installed to be separated and prevented from flow by the snap ring 26. In the middle of the rotation shaft 21, a pin 23 fixed to the rotation shaft 21 is provided.

The wheel 23 is rotated together when the rotating shaft 21 is rotated, and through the inlet hole 16 in which the outside air is drilled a lot in the middle of the handle case 14 by the rotation of the wheel 23. After being introduced into the exhaust port 15 in the rear of the handle case 14 is to be discharged.

The air circulation by the fan 23 is to have the effect of discharging the heat generated by the high-speed rotation in all the drive parts, including the rotary shaft 21 to the outside, thereby the life of the grinding machine 10 To increase.

On the other hand, the output shaft 21b of the rotation shaft 21 and the output shaft 21b of the power transmission unit 20 is provided with an eccentric shaft portion 24 having a center on one side slightly from the center of the rotation shaft 21, and outside the eccentric shaft portion 24. The bearing 25 is provided so that it may fit.

Therefore, when the rotating shaft 21 is rotated, the eccentric shaft portion 24 including the bearing 25 is rotated eccentrically with the rotating shaft 21 while drawing an arc.

In addition, the bearing 25 including the eccentric shaft portion 24 is to be inserted into the power switching long hole 32 in the rear of the lateral movement rod 31 of the power switching unit 30.

As shown in FIG. 6, the power conversion long hole 32 has a narrow width portion 32a and a long length portion 32b, and the eccentric shaft portion 24 and the bearing fitted thereto in the power switching long hole 32. (25) is inserted into the eccentric rotation.

Therefore, when the bearing 25 of the eccentric shaft part 24 which makes the eccentric rotation movement in the state which draws the arc is located in the length part 32b while turning, the length between the length parts 32b is long, (32) It does not push the inner surface.

However, when the bearing 25 of the long hole 32 comes to both width portions 32a, the inner surface of both long portions 32a of the long hole 32 is alternately pushed outward, so that the rod 25 is centered about the rod shaft 33. The input end 31a of the lateral movement rod 31 is in a state of reciprocating from left to right or from right to left.

On the other hand, the rod shaft 33 is fixedly installed in the handle case 14, the left and right movement rod 31 is reciprocating left and right about this.

In addition, the bearing 34 is provided on both sides of the left and right movement rod 31 through which the rod shaft 33 penetrates, so that the movement of the left and right reciprocating rods 31 is smooth, and the bearing 34 is a bearing. It is to be supported by the housing 35, the bearing housing 35 is installed to be fixed in the handle case (14). Here, the bearing housing 35 is formed in two parts as shown in FIG. 4 so as to be mutually assembled by the fastener 37, so that the rod shaft 33 and the bearing 34 can be installed.

In addition, the rod shaft 33 installed in a fixed state to the handle case 14 including the bearing housing 35 installed so as not to be detached by the housing detachment prevention 39 is to be firmly installed and the bearing 34. Since the left and right movement rod 31 is smoothly rotated by the left and right movement rod 31 has a rapid movement and there is no failure in the power switching unit 30 even if the long-term use is followed.

The output end 31b fixed by the screw 38 in the lateral movement rod 31 is exposed to the outside by penetrating the attachment of the handle case 14, and at the end of the output end 31b, a connection member ( 36, the grinding wheel 40 is to be coupled.

Therefore, the grinding wheel 40 is left by the output end 31b which is left and right reciprocating about the rod shaft 33 as the input end 31a of the left and right movement rod 31 moves left and right. , Right reciprocating movement. And the left and right round trip speed is very fast.

Accordingly, when the handle case 14 of the grinding machine 10 is held with one hand, the grinding of the workpiece is carried out by the grinding wheel 40 which is left and right reciprocated at a high speed when the grinding wheel 40 is placed on the portion. You can do it.

The grinding machine 10 of the present invention has the following advantages, and the first is that the motor 11 is not built into the grinding machine 10, but used to be installed outside, so that the capacity of the motor 11 is large. As it can be used, the grinding wheel 40 is driven to drive the left and right reciprocating motion, that is, the grinding force (force), thereby increasing the grinding efficiency.

Secondly, since the motor 11 is not embedded in the grinding machine 10, it is possible to reduce the weight and obtain a grinding machine 10 having a small size or volume, which is convenient for grinding operation by holding it with one hand.

Third, since the heat generated inside the grinding machine 10 is exhausted, the deterioration deformation of the parts is prevented and the motor 11 is not directly subjected to vibrations as before. Since there is no built-in inside the grinding machine to reduce the unnecessary space and close assembly between the parts is promoted, there is an advantage to obtain a solid grinding machine (10).

According to the above description, the present invention not only obtains a small volume grinder which is convenient to hold and work by hand, but also has an effect of obtaining a good grinding machine of grinding force (force).

It is also a useful design with the effect of providing a grinding machine that is robust and has a very low failure rate.

Claims (1)

In the hand tool having a handle case and the power transmission unit is installed to operate by receiving power from the motor from the outside, the power transmission unit in the hand tool having an input shaft and an output shaft connected to the cable, It is configured to be directly connected to the power conversion unit by a rotating shaft which is installed to be supported by the bearing, and an eccentric shaft portion which protrudes eccentrically to the output shaft portion and the bearing is coupled, The power conversion unit supports the rod shaft and the rod shaft is installed in the middle to allow the left and right reciprocating movement of the left and right movement rod having an input end having an eccentric shaft portion is inserted and the output end combined with the grinding wheel Hand grinding machine, characterized in that consisting of a bearing housing having a bearing for smooth movement of the lateral movement rod.