JP2000202752A - Hand grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily polish not only a floor surface but also a ceiling or the like. SOLUTION: A grinder comprises a grinder main unit 1 having a polishing part 13, operating grip part 2, turn start end position adjusting means, and a turn finish end position regulating means. The operating grip part 2 is turnably connected to the grinder main unit 1 through a connection member 3, to make a 10 to 15 deg. angle A relating to the polishing part 13 of the grinder main unit 1, to be turned with a position of this polishing part serving as a turn start end position. The turn start end position adjusting means has a lock member contact part provided in the operating grip part 2 and a lock member movably locked to the grinder main unit 1. By operating the lock member, the lock member contact part abuts to the lock member, to make a 60 to 70 deg. angle A relating to the grinder main unit 1, and this position serves as the turn start end position. The turn finish end position regulating means, having a regulating member 7 provided in the operating grip part 2, regulates a turn finish end position of the operating grip part 2 by making the regulating member 7 abut to the grinder main unit 1 in a position where the operating grip part 2 is turned from the turn start end position to make 85 to 90 deg. angle A relating to the grinder main unit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a floor surface of a building,
The present invention relates to improvement of a hand grinder for polishing a wall surface, a ceiling, a stone, a metal, or the like.

[0002]

2. Description of the Related Art Portable hand grinders for polishing floors, walls, ceilings and the like of buildings, stones, metals and the like have been known. As shown in FIG. 15, this conventional hand grinder includes a grinder main body a and a long operation gripping part b for operating the grinder main body a, and the grinder main body a and the operation gripping part b are rotatable. Connected, a leaf spring c is provided between the grinder body a and the operation gripping part b, and the operation gripping part b for the grinder body a in a normal state where no external force is applied.
Is a position at an angle A of 10 to 15 ° with respect to the grinder body a. By doing so, when the floor surface T1 is polished as shown in FIG. 16, even when the worker stands normally, the operation grip portion b can be easily lifted,
The floor surface T1 can be easily polished by operating the operation grip portion b.
On the other hand, by operating the operation grip portion b against the urging force of the leaf spring c, the operation grip portion b sets the position of the operation grip portion b in a state where the above-described external force is not applied to the rotation start end position. ,
From this rotation start position, the angle A formed with respect to the grinder body a by rotating with respect to the grinder body a can be increased, whereby the angle A at which the ceiling or the like can be easily polished can be set.
However, when the ceiling is polished, the rear end of the operation gripping portion b gripped by pressing the polishing surface a1 provided on the grinder main body a against the ceiling is rotated in a direction in which the rear end of the operation gripping portion b is separated from the grinder main body a. Since the angle A formed by the operation gripping part b with respect to the main body a must be increased, as shown in FIG. 17A, when the operation gripping part b is at the above-mentioned rotation start end position, the grinding of the grinder main body a is performed. It is difficult to press the surface a1 against the ceiling, and performing the work is troublesome for the worker. In particular, it is difficult and difficult for a short person to keep the polished surface a1 of the grinder body a on the ceiling. Moreover, the operation gripper b
When the grinding surface a1 of the grinder body a is pressed against the ceiling in a state in which the grinder body a is at the rotation start end position, as shown in FIG. The surface a1 can easily reach the ceiling, but in that case, the outer peripheral surface of the polished surface a1 of the grinder main body a hits the ceiling. If the outer peripheral surface of the polishing surface a1 hits the ceiling in this way, the rotation of the polishing surface a1 causes the hand grinder to fly off, which is extremely dangerous.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and has as its object to provide a hand grinder which can easily and safely grind not only a floor but also a ceiling. Aim.

[0004]

The present invention solves the above problems by providing a hand grinder having the following features. The first invention of the present application includes a grinder main body 1 and a long operation grip portion 2. The grinder main body 1 and the operation gripper 2 are rotatably connected, so that the position of the operation gripper 2 with respect to the grinder main body 1 in a state where no external force is applied is set as a rotation start end position, and the rotation is performed. By rotating from the starting end position, the angle formed with the grinder body 2 can be increased. Furthermore,
A rotation start end position adjusting means 61 for adjusting the rotation start end position of the operation gripper 2 with respect to the grinder body 1 is provided.

According to a second invention of the present application, the rotation start position adjusting means 61 according to the first invention of the present application is capable of selecting a rotation start position of a plurality of angles.

In the first invention of the present application configured as described above, the operation gripping part for the grinder main body 1 is controlled by the rotation start end position adjusting means 61 for adjusting the rotation start end position of the operation gripping part 2 with respect to the grinder main body 1. The rotation start end position of the operation gripper 2 is set to a position at an angle of, for example, 60 to 70 ° with respect to the grinder main body 1 in a state where no external force is applied. If the polishing surface 14 of the grinder body 1 is brought into contact with the ceiling, the operation gripper 2 forms an angle of 60 to 70 ° with respect to the grinder body 1, so that even a short person can easily carry out the grinder body 1. Can be applied to the ceiling. Moreover, even if the operation gripper 2 is made vertical, the polishing surface 14 is sufficiently inclined with respect to the ceiling surface, so that the outer periphery of the polishing unit 13 of the grinder body 1 is brought into contact with the ceiling as in the conventional case. Therefore, the polishing surface 14 can be reliably applied to the ceiling without any trouble, and the operation can be performed safely.

In the second invention of this application, the rotation start end position adjusting means 61 selects the rotation start end position of the operation gripper 2 to a plurality of positions at various angles with respect to the grinder body 1 as appropriate. Can be used. Thus, the rotation start end position of the operation gripper 2 can be set to, for example, a position at a small angle with respect to the grinder body 1, a position at a large angle, and a position at an intermediate angle therebetween. In this way, when polishing the floor surface, a small angled position can be selected and used, and when polishing the ceiling, a large angled position can be selected and used. In the case of polishing a wall surface, a position at an intermediate angle can be selected and used, and it can be used at an angle that is easy to polish in each case according to various workpieces having different angles.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side view of a hand grinder according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

The hand grinder according to the present invention comprises a grinder body 1, an operation gripper 2, and a grinder body 1.
A connecting member 3 rotatably connecting the operating grip 2 and
A rotation start position adjusting means and a rotation end position regulating means are provided.

The grinder body 1 includes a casing 11
And a polishing unit 13. This casing 11
Is provided with a motor or the like (not shown) inside, and a rotating shaft 12 projecting downward at a lower end on the front side of the casing 11.
It has. The polishing section 13 has a polishing material provided on the lower surface, and the lower surface forms a polishing surface 14. The polishing section 13 is non-rotatably attached to the rotating shaft 12 so that the polishing section 13 rotates together with the rotation of the rotating shaft 12.

The operation gripper 2 is used to operate the grinder main body 1, and in the present embodiment, is constituted by a long tubular body. The rear side of the operation gripper 2 is the gripper 2
1 and the grinder body 1 is operated while holding the holding portion 21.

The connecting member 3 includes a holding member 5 for holding the grinder body 1 and a fixing member 4 fixed to the operation holding portion 2. The holding member 5 includes a holding body 51 having a substantially U-shape as shown in FIG. 3 and a holding piece 52 attached to a lower side of the holding body 51. On the upper surface of the holding body 51, a left support piece 54a and a right support piece 54 are provided.
The two support pieces 54a and 54b, which form a pair on the left and right with b, respectively, protrude upward. The distance between the left support piece 54a and the right support piece 54b is set to be wider than the width of the main body 42 of the fixing member 4 described later.
2 can be inserted. Then, the holding body 51 is put on the upper outer periphery of the casing 11 of the grinder body 1 from above, and the holding piece 52 is put on the lower outer periphery of the casing 11 of the grinder body 1 from below. Bolts 53a, 53a passing through screw insertion holes formed in each of 51 and the holding piece 52 are screwed into nuts 53b, 53b and tightened, so that the holding body 51 and the holding piece 52 are arranged therebetween. The grinder body 1 is clamped.

The fixing member 4 is, as shown in FIGS.
A fixing portion 41 for fixing the operation grip portion 2 is provided on the rear end side. The fixing portion 41 has a cylindrical shape, and the operation holding portion 2 can be inserted therein. Also, the fixing part 41
The upper surface is provided with a vertical groove 41b extending in the front-rear direction, and fastening pieces 41c, 41c having a pair of left and right bolt fitting holes formed on both left and right sides of the vertical groove 41b. Then, after the front part of the operation grip part 2 is inserted into the fixing part 41, the tightening bolt 41 e inserted through the bolt insertion hole of each of the tightening pieces 41 c and 41 c and the nut 41 d screwed thereto are tightened. As a result, the vertical groove 41b
The operation gripping part 2 inserted into the inside of the device is fastened and fixed from the outer peripheral side.

The front side of the fixing member 4 has an upper surface, a main body 42 having a U-shaped cross section having a left surface and a right surface extending downward from the upper surface, a rotating shaft 43, and a biasing spring. 44, 44
And The central portion of the rotating shaft 43 is fixed by fixing means such as welding so as to extend below the left and right surfaces of the main body 42. The left and right ends of the rotating shaft 43 pass through shaft fitting insertion holes 54c, 54c formed in the left support piece 54a and the right support piece 54b of the holding body 51, respectively, so that the holding body 51 can be turned freely. , Whereby the operation gripper 2 and the grinder body 1 are rotatably connected to each other. The biasing springs 44, 44
It is constituted by a coil spring, and is passed through each of the left and right ends of the rotating shaft 43 protruding from the shaft insertion holes 54a, 54a on both right and left sides of the holding body 51, and one end is connected to each of the left support piece 54a and the right support piece 54b. And the other end is locked to each of the rotating shafts 43.
Energize. Further, in the normal state shown in FIG. 1 in which no external force is applied to the urging springs 44, 44, the angle A formed between the operation grip portion 2 and the grinder body 1 by the urging springs 44, 44, more specifically, the operation grip The angle A between the axial direction of the part 2 and the polishing surface 14 of the grinder body 1 is maintained at 10 to 15 °. Then, the position of the operation gripper 2 with respect to the grinder body 1 in a normal state where no external force is applied is set as a rotation start end position, and the gripper 21 of the operation gripper 2 is pressed against the biasing springs 44, 44 from this position. When the operation gripper 2 is lifted upward in FIG.
The grinder 3 is rotated from the rotation start end position so that the angle A gradually becomes larger with respect to the polishing surface 14 of the grinder body 1.

The turning start end position adjusting means is for adjusting the turning start end position of the operation grip portion 2 with respect to the grinder body 1, and is formed on the fixing member 4 of the connecting member 3 as shown in FIGS. Locking member contact portion 62 and fixing member 4
And a locking member 61 that is movably locked to the holding body 51 in a direction approaching and opposing the holding member 61. The locking member contact portion 62 is formed of a hole formed in a semicircular shape from the lower surface on the right side of the main body 42 of the fixing member 4.
The locking member 61 is a bolt member 6 having an external thread 61a.
1 and a right support piece 54b of the clamping body 51.
The bolt member 61 is screwed into a screw hole 63 provided on the rear side and the upper side of the shaft insertion hole 54a in
The male screw portion 61a of the bolt member 61 is
Moves in the left-right direction within a range from the right side position to the lower position of the main body 42 of the fixing member 4. Further, the disposition position of the locking member 61 with respect to the locking member contact portion 62 is as follows.
The operation gripper 2 is rotated from the position shown in FIGS. 1 and 4 above, and as shown in FIG.
When the angle A is 0 to 70 °, the male screw portion 61a of the locking member 61 and the locking member contact portion 62 of the operation grip portion 2 are at the same height, and the male screw portion 61a of the locking member 61 is It is configured to be able to enter the lower side of the locking member contact portion 62.

The rotation end position restricting means is for restricting the rotation end position of the operation grip portion 2 which is rotated from the rotation start end position. In this embodiment, as shown in FIG. 4 comprises a regulating member 7 attached to the main body 42. The restricting member 7 has a rod-like shape, and has a contact portion 71 on the front end surface for contacting the upper surface of the holding body 51. When the rear end side of the regulating member 7 is fixed to the upper surface of the main body 42 of the fixing member 4, the contact portion 71
Project forward from the main body 42 of the fixing member 4.
The amount of protrusion of the contact portion 71 from the main body 42 is such that the angle A formed between the operation gripper 2 and the grinder main body 1 by rotating the operation gripper 2 from the rotation start end position with respect to the grinder main body 1 is 85-85. When the angle reaches 90 °, the contact portion 71 comes into contact with the upper surface of the holding body 51 as shown in FIG.

The hand grinder according to the present embodiment is provided with a dust suction device 8. As shown in FIGS. 1 and 2, the dust suction device 8 in this embodiment includes a dust suction device body 81 that sucks and stores abrasive powder and a covering member 8 that covers the polishing unit 13 of the grinder body 1 from above.
2 and a transfer path 83 for sending the abrasive powder from the covering member 82 to the dust suction device main body 81. Although not shown, the dust suction device main body 81 includes a motor, an abrasive powder storage unit, and the like inside.

The covering member 82 has an upper wall 84 made of synthetic resin and a side wall 85 made of synthetic rubber, as shown in FIGS. The upper wall 84 includes a circular portion 84a and a straight portion 84b.
, And has a shape obtained by cutting a part of a disk. The diameter of the circular portion 84a is slightly larger than the diameter of the polishing portion 13 of the grinder body 1. The outer periphery of the circular portion 84a is provided with a flange 84c extending downward, and the outer periphery of the flange 84c is provided with three projections 84d... 84d projecting radially outward. Also, the circular portion 84
The core portion a is provided with a main body mounting hole 84e penetrating from the upper surface to the lower surface. Then, the casing mounting portion 84 e of the grinder main body 1 passes through the rotation shaft 12 of the grinder main body 1 so that the body mounting hole 84 e passes therethrough.
, The upper wall 84 is attached to the grinder body 1. In addition, since the upper wall 84 is attached to the grinder main body 1, the polishing portion 13 of the grinder main body 1 is covered by the upper wall 84 from above.

The side wall 85 is provided with four projection receiving grooves 85a... 85a on the inner periphery on the upper side. The projection receiving grooves 85a... 85a correspond to the circular portions 8 in the upper wall 84.
The projections 84d... 84d of 4a serve as attachment means for attaching the upper wall 84 and the side wall 85, and also serve as means for adjusting the vertical position of the lower end surface 87 of the side wall 85 described later. The upper three sides of the projection receiving grooves 85a... 85a are the projections 84d of the circular portion 84a on the upper wall 84.
.. 84d, the side wall 85 is attached to the entire outer periphery of the circular portion 84a. Further, since the side wall 85 is attached to the entire outer periphery of the circular portion 84a, the polishing portion 13 of the grinder body 1 is covered by the side wall 85 from the side. And this lower end face 8
Numeral 7 is set so as to be slightly higher than the polishing surface 14 of the polishing section 13 in the polishing section 13 of the grinder main body 1. When the polishing section 14 of the grinder main body 1 is brought into contact with the material F to be polished, A gap 88 is formed between the abrasive F and the lower end face 87.

The lower end surface 87 is connected to the upper wall 84.
Of the projections 84d... 84d and the projection receiving grooves 85a of the side wall 85.
The upper and lower positions can be adjusted by the upper and lower position adjusting means constituted by the upper and lower portions 85a. More specifically, for example, when lowering the position of the lower end face 87 to the lower side, the upper three projection receiving grooves 85a.
.. 84d from the state shown in FIG. 5 (B) fitted into each of the projection receiving grooves 85a on the uppermost side as shown in FIG. 6 (A).
Into the lower protrusion 84d of the upper wall 84, the position of the lower end face 87 can be lowered to the lower position. On the other hand, when lowering the position of the lower end face 87 upward, the state shown in FIG.
As shown in (B), three projection receiving grooves 8 at the lowermost and central portions 8
85a is fitted into each of the protrusions 84d... 84d of the upper wall 84, so that the position of the lower end face 87 can be raised to an upper position.

Also, in this manner, the circular portion 84 of the upper wall 84 is formed.
The cover member 82 having the side wall 85 attached to a has an opening 86 formed on the front side, and a front part of the polishing portion 13 of the grinder body 1 is exposed from the opening 86.

In the present embodiment, the transfer path 83 includes a bellows-like front hose 83a and a rear hose 8a as shown in FIGS.
3b and the above-mentioned operation gripping part 2. The front end of the front hose 83a is connected to a connection hole 84f (shown in FIG. 5A) formed in the upper wall 84 of the covering member 82,
The rear end side is connected to the inside of the front end side of the operation grip part 2. The front end side of the rear hose 83b is connected to the inside of the rear end side of the operation grip part 2, and the rear end side is connected to the polishing powder storage part of the dust suction device main body 81. In this way, the front hose 8
3a, the rear hose 83b, and the operation gripper 2
A single transfer path 83 communicating between the two and the dust-collecting device main body 81 is formed, and the abrasive powder in the covering member 82 is transferred to the dust-collecting device main body 81.

Next, a method of using the hand grinder configured as described above will be described. For example, when polishing the floor surface, the tip of the male screw portion 61a of the bolt member 61 is set to the right side position of the right side surface of the main body portion 42 in the fixing member 4 (the state of FIGS. 2 and 3), and the main body portion The locking member contact portion 62 of 42 does not contact the male screw portion 61a. In this state, the operation gripper 2 is in a state where no external force is applied, and as shown in FIG.
Is maintained at a position at an angle A of 10 to 15 ° with respect to the rotation start position. Then, from this state, the grinder body 1 is operated to rotate the polishing section 13, and at the same time, the grip section 21 of the operation grip section 2 is gripped and the polishing surface 14 of the grinder body 1 is brought into contact with a floor surface to be polished. . In addition, when the polishing surface 14 is brought into contact with the floor, the lower end surface of the side wall 85 of the covering member 82 can be brought into contact with the floor at the same time. At this time, the worker holding the holding portion 21 stands on the polishing surface 1 of the grinder body 1 while standing normally.
4 can be applied to the floor, and the work can be performed easily.

Then, the polished polishing powder is applied to the covering member 82.
The powder is transferred from the inside to the dust suction device main body 81 through the transfer path 83, thereby preventing the abrasive powder from scattering around. Further, at this time, since the gap 88 is formed between the lower end face 87 of the side wall 85 of the covering member 82 and the material to be polished F, the lower end face 87 is sucked when the abrasive powder is sucked.
Can be prevented from sticking to the surface. Further, for example, as shown in FIG.
Even when the lower end surface 87 of the side wall 85 abuts against the workpiece F, the side wall 85 of the covering member 82 is made of synthetic rubber.
4 can be brought into contact with the workpiece F, and the polishing surface 1
It is possible to prevent the whole of 4 from floating from the workpiece F. Further, since the front part of the polishing portion 13 of the grinder body 1 is exposed from the opening 86 of the covering member 82, the corner of the floor can be polished without the covering member 82 being in the way. On the other hand, during the operation of moving the entire hand grinder while bringing the polishing surface 14 into contact with the floor surface, a separate hose is provided as a transfer path between the covering member 82 and the dust suction device main body 81 on the side of the operation gripper 2. If it is provided, it is difficult to move the entire hand grinder because the hose is in the way, but in the present embodiment, since the operation gripper 2 is a part of the transfer path 83, the entire hand grinder can be easily formed. And can be easily operated. When the lower end surface 87 of the side wall 85 of the covering member 82 is worn out after polishing, the state shown in FIG. 5B is changed from the state shown in FIG. 5B to the uppermost side as shown in FIG. By fitting the projection receiving groove 85a into the lower projection 84d of the upper wall 84, the lower end face 8 is formed.
7 can be lowered to the lower position, and the gap 88 between the lower end face 87 and the workpiece F can be kept substantially constant. On the other hand, when the polished surface 14 is worn away, the state shown in FIG. 5B is changed from the state shown in FIG. 84d... 84d of the upper wall 84, the lower end face 87 can be lowered to the lower position.
The gap 88 between the workpiece 7 and the workpiece F can be kept substantially constant. Further, when the polishing surface 14 is worn down to lower the position of the lower end surface 87 to the lower position, the lower end of the side wall 85 may be cut with a knife or the like to adjust the vertical position of the lower end surface 87 of the side wall 85. . Specifically, the side wall 85 of the covering member 82
Is made of an inflexible hard material, the lower end of the side wall 85 cannot be easily cut with a knife or the like. However, in this embodiment, since the side wall 85 is made of synthetic rubber, The lower end of the side wall 85 can be easily cut with a cutting tool or the like, and the lower end 8
7 can be adjusted up and down.

On the other hand, when the ceiling is polished, for example, the operation grip portion 2 is rotated upward with respect to the grinder main body 1 against the biasing springs 44 from the state shown in FIGS. At the same time, as shown in FIG. 7, the distal end of the male screw portion 61 a of the bolt member 61 is positioned below the main body portion 42 of the fixing member 4 by rotating the bolt member 61. Thus, when the operation of rotating the operation gripper 2 with respect to the grinder body 1 against the urging springs 44, 44 is stopped, the operation gripper 2 is moved by the urging force of the urging springs 44, 44 as shown in FIGS. 3 is returned to the state shown in FIG.
And stops in contact with the male screw portion 61a of the second member, and is maintained in that state. In this state, when no external force is applied, the operation gripper 2 is at a position at an angle A of 60 to 70 ° with respect to the grinder main body 1 as shown in FIG. At the rotation start end position.
Then, from this state, the gripping portion of the operation gripping portion 2 is gripped, and the polishing surface 14 of the grinder body 1 is brought into contact with the ceiling. At this time, the operation gripping part 2 is
Since the angle A is about 70 °, even a short person can easily bring the polishing surface 14 of the grinder body 1 into contact with the ceiling. Moreover, even if the operation gripper 2 is made vertical, the polishing surface 14 is sufficiently inclined with respect to the ceiling surface, so that the outer periphery of the polishing unit 13 of the grinder body 1 is brought into contact with the ceiling as in the conventional case. Polished surface 1 without any problems
4 can be applied to the ceiling, and the operation can be performed safely.

When the operation gripper 2 is operated while the polishing surface 14 is pressed against the ceiling, the operation gripper 2 rotates at an angle A of 60 to 70 ° with respect to the grinder body 1. By rotating from the position, the angle A with respect to the grinder main body 1 can be gradually increased. Then, when the angle A of the operation gripping portion 2 with respect to the grinder main body 1 becomes 85 to 90 °, the restricting member 7 comes into contact with the upper surface of the holding main body 51, and further rotation is restricted, and the device can be used in that state. The angle A of the operation grip part 2 with respect to the grinder body 1 is 85 to 90 °
When used, the polishing surface 14 can be pressed against the ceiling by pushing up the operation grip portion 2, and the polishing operation can be easily performed with a smaller force when the operation grip portion 2 is inclined with respect to the grinder body 1. That can be easily operated. Moreover, when the regulating member 7 is not provided,
The angle A of the operation gripper 2 with respect to the grinder body 1 is 9
When used at an angle of 0 ° or more, the biasing spring 44,
A large force is applied to 44, which causes the urging springs 44, 44 to be set. However, by providing the regulating member 7, this can be prevented and the device can be used smoothly.

In the present embodiment, the rotation start position adjusting means is adapted to adjust the rotation start position only once with one locking member 61. However, the present invention is not limited to this embodiment. As shown in FIG.
61 may be provided so that the rotation start end position can be adjusted a plurality of times. In addition, the present invention is not limited to a configuration in which the locking member 61 is moved from the side of the fixing member 4 in a direction approaching and facing the fixing member 4. For example, as shown in FIG. A plate-shaped locking member support piece 64 having a screw hole 64a is provided below the fixing member 4 between the pieces 54a (only the left support piece 54a appears in FIG. 12).
To the left and right support pieces 54a, 54b, and screw the bolt member 61 as the locking member 61 into the screw hole 64a of the locking member support piece 64 so that the bolt member 61 is vertically movable. The male screw portion 61a of the bolt member 61
The lower end of the fixing member 4 is received at the tip of the screw member 61, and the angle of the operation gripper 2 fixed to the fixing member 4 is adjusted by the vertical movement of the tip of the male screw portion 61a accompanying the turning operation of the bolt member 61. good. This is advantageous in that the angle of the rotation start end position of the operation gripper 2 with respect to the grinder body 1 can be adjusted steplessly.

Further, in the present embodiment, the rotation starting end position of the operation gripper 2 with respect to the grinder main body 1 by the locking member 61 and the angle formed by the operation gripper 2 with respect to the grinder main body 1 become 60 to 70 °. Set to position,
The present invention is not limited to this, and can be set at an appropriate position and can be changed as appropriate.

In this embodiment, the locking member contact portion 62 to be brought into contact with the locking member 61 is constituted by a hole formed in a semicircular shape, and the locking member 61 and the locking member contact portion 62 are formed. However, the present invention is not limited to this mode, and may be applied to the lower surface of the main body portion 42 of the fixing member 4 without providing a hole, and may be changed as appropriate.

Further, the rotation end position restricting means is not limited to the form composed of the restricting member 7 attached to the main body 42 of the fixing member 4, but can be changed as appropriate. Further, in the present embodiment, the grinder main body 1 is controlled by the rotation end position regulating means.
Angle of the operation gripper 2 with respect to the grinder body 1 is 85 to 90 °.
However, the position is not limited to this, and can be set to an appropriate position and can be changed as appropriate. Further, the rotation end position regulating means may not be provided. However, by providing the rotation end position restricting means 7 for restricting the rotation end position of the operation grip portion 2 which rotates from the rotation start end position, for example, the operation grip portion for the grinder body 1 is provided. The rotation of the operation gripper 2 can be stopped at a position where the angle of 2 becomes 85 to 90 °, and can no longer be rotated. The angle of the operation gripper 2 with respect to the grinder body 1 is set to 85 to 90 °. Can be used. When used in such a state, the polishing surface 14 of the grinder main body 1 can be pressed against the ceiling by pushing up the operation gripper 2, and the operation gripper 2 is inclined with respect to the grinder main body 1. The polishing operation can be performed with a smaller force, and the operation can be facilitated. Moreover, the urging spring 4
4, 44 can be prevented from being applied with a large force.
It is preferable to provide them because they have an advantage that they can be used smoothly by preventing settling of 4, 44.

In this embodiment, the locking member contact portion 62 to be brought into contact with the locking member 61 is constituted by a semicircular hole, and the locking member 61 and the locking member contact portion 62 are formed. However, the present invention is not limited to this mode, and may be applied to the lower surface of the main body portion 42 of the fixing member 4 without providing a hole, and may be changed as appropriate.

Further, the rotation end position regulating means is not limited to the form constituted by the regulating member 7 attached to the main body 42 of the fixing member 4, but can be changed as appropriate. Further, in the present embodiment, the grinder main body 1 is controlled by the rotation end position regulating means.
Angle of the operation gripper 2 with respect to the grinder body 1 is 85 to 90 °.
However, the position is not limited to this, and can be set to an appropriate position and can be changed as appropriate. Further, the rotation end position regulating means may not be provided.

On the other hand, in the present embodiment, the operation gripper 2 is
Although it is a part of the transfer path 83, the present invention is not limited to this form. For example, as shown in FIG. 13, the entire transfer path 83 is formed of a bellows-shaped hose 83 separate from the operation gripping part 2,
The covering member 82 and the dust-absorbing device main body 81 may be connected so as to be juxtaposed to the operation grip portion 2, and can be changed as appropriate.

In the present embodiment, the means for adjusting the vertical position of the lower end face 87 is provided by three projections 84b, 8 provided on the upper wall 84.
4d and four protrusion receiving grooves 85a provided on the side wall 85.
a, but is not limited to this form. At least the projections 84d, 84d or the projection receiving grooves 85a, 85d
a may be provided as two or more, for example, a plurality of ones of the protrusion 84b or the protrusion receiving groove 85a may be provided, and only one may be provided, and may be appropriately changed.
Further, the vertical position adjusting means is not limited to a configuration comprising a projection 84b provided on the upper wall 84 and a projection receiving groove 85a provided on the side wall 85. For example, a projection is provided on the side wall 85 and the upper wall 84 is provided. A projection receiving groove may be provided. Further, the vertical position adjusting means of the lower end surface 87 may not be provided, in which case one projection is provided on one of the upper wall 84 and the side wall 85 and one projection receiving groove is provided on the other. Should be provided.

Further, in the present embodiment, the entire side wall 85 of the covering member 82 is made of synthetic rubber, but at least a part of the side wall 85 may be made of synthetic rubber. The upper and lower portions of 85 may be made of synthetic resin, and the portion between them may be made of synthetic rubber, which can be changed as appropriate.

The entire lower end surface 87 of the covering member 82 is
The present invention is not limited to the configuration made of synthetic rubber, and for example, a hard member 87a may be provided on a part or the entirety of the lower end surface 87. More specifically, for example, as shown in FIG. 14A, the hard member 87a is formed in a thin plate shape from a material harder than synthetic rubber, for example, synthetic resin or metal, and covers the entire lower surface or a part of the side wall 85. And attached to the side wall 85. By doing so, it is possible to make the lower end face 87 slippery with respect to the material to be polished F, and it is possible to reduce the decrease in the lower end face 87 when the material is slid in contact with the material to be polished F. In addition, even when the entire lower end face 87 abuts on the workpiece F, the lower end face 87 does not come into close contact with the workpiece F, and the lower end face 87 is attracted to the workpiece F by a suction force. Can be prevented.

The lower end surface 87 of the side wall 85 of the covering member 82
The surface may have irregularities. More specifically, for example, as shown in FIG.
By forming the protrusions 7c and the protrusions 87d alternately along the circumferential direction, the entire lower end surface 87 is made uneven. By having such irregularities, even when the lower end face 87 abuts on the workpiece F, a gap 88 can be secured between the lower end face 87 and the workpiece F by the concave portion 87c, At this time, air can be drawn into the inside of the covering member 82 from the outside of the covering member 82, and the lower end surface 8 of the covering member 82 can be drawn.
7 can be prevented from adhering to the workpiece F in close contact with the workpiece F. It should be noted that the air intake portion is not limited to the one having the unevenness, and may be provided on the side wall 85 of the covering member 82, or on the upper wall 84, or on the side wall 85, as shown by broken lines in FIGS. One or a plurality of through holes 89... 89 penetrating from the inner wall to the outer wall may be provided in the upper wall 84, and even in this case, air is introduced from outside the covering member 82 into the inside of the covering member 82 during suction. The lower end surface 87 of the covering member 82 is
Can be prevented from adhering to the material to be polished F closely. When the through holes 89 are provided, the lower end surface 87 of the side wall 85 may not be provided with irregularities, but the through holes 89... 89 may be provided together with the irregularities and may be changed as appropriate.

[0038]

As described above, according to the first aspect of the present invention, the rotation start end position adjusting means 61 adjusts the rotation start end position of the operation gripper 2 with respect to the grinder main body 1 in a state where no external force is applied. The grinder body 1 can be positioned at an appropriate angle with respect to
Can be applied to the ceiling. Moreover, even if the operation gripper 2 is made vertical, the polishing surface 14 is sufficiently inclined with respect to the ceiling surface, so that the outer periphery of the polishing unit 13 of the grinder body 1 is brought into contact with the ceiling as in the conventional case. Therefore, the polishing surface 14 can be reliably applied to the ceiling without any trouble, and the operation can be performed safely.

According to the second invention of the present application, in addition to the effect of the first invention of the present application, the rotation start end position adjusting means 61 adjusts the rotation start end position of the operation grip portion 2 according to various polished materials having different angles. In each case, it can be used at an angle that is easy to polish, and the polishing operation can be performed according to various materials to be polished, and the polishing operation can be facilitated.

[Brief description of the drawings]

FIG. 1 is a side view of a hand grinder according to an embodiment of the present invention.

FIG. 2 is a plan view of a hand grinder according to one embodiment of the present invention.

FIG. 3 is a front view of a connecting member.

FIG. 4 is a sectional view taken along the line III-III in FIG. 3;

FIG. 5A is a plan view of a covering member, and FIG. 5B is a plan view of the covering member.
FIG. 4 is a sectional view taken along line IV-IV of FIG.

6A is a cross-sectional view of the covering member in a state where the lower end surface of the covering member is adjusted downward, and FIG. 6B is a sectional view of the covering member in a state where the lower end surface of the covering member is adjusted upward. FIG.

FIG. 7 is a front view of the connecting member when the rotation start position of the operation grip portion is changed by the rotation start position adjusting means.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is a side view in which a part of a state in which the rotation of the operation gripping portion is stopped by the rotation end position regulating means is a cross section.

FIG. 10 is an enlarged explanatory view of a main part in a state in which a polishing part is inclined and a lower end surface of a covering member is in contact with a material to be polished;

FIG. 11 is a side view, partially in section, of another embodiment of the rotation start end position adjusting means.

FIG. 12 is a side view, partly in section, of still another embodiment of the rotation start end position adjusting means.

FIG. 13 is a plan view of the entire hand grinder according to another embodiment of the transfer path.

14A is a cross-sectional view showing another embodiment of the covering member, and FIG. 14B is a side view showing another embodiment of the covering member.

FIG. 15 is a side view of a conventional hand grinder.

FIG. 16 is an explanatory diagram when a floor is polished by a conventional hand grinder.

FIG. 17 (A) is an explanatory view of polishing a ceiling with a conventional hand grinder, and FIG. 17 (B) is a diagram of polishing the ceiling with a conventional hand grinder; It is an explanatory diagram in the case of hit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grinder main body 2 Operation gripping part 3 Connecting member 4 Fixing member 5 Nipping member 7 Restriction member 8 Dust absorbing device 13 Polishing part 14 Polishing surface 43 Rotating shaft 61 Locking member 81 Dust absorbing device main body 82 Covering member 83 Transfer path 87 Covering member Lower end 89 Through hole

Claims (2)

[Claims] A grinder body (1) and an elongated operation grip (2) are provided, and the grinder body (1) and the operation grip (2) are rotatably connected to each other. The position of the operation gripper (2) with respect to the grinder body (1) in a state where no external force is applied is defined as a rotation start end position, and the angle formed between the operation gripper (2) and the grinder body (2) by rotating from the rotation start end position. And a rotation start position adjusting means (61) for adjusting the rotation start position of the operation gripper (2) with respect to the grinder body (1). Hand grinder. 2. The hand grinder according to claim 1, wherein the rotation start position adjusting means (16) is capable of selecting a rotation start position at a plurality of angles.