CN209868498U - Power tool and locking mechanism - Google Patents
Power tool and locking mechanism Download PDFInfo
- Publication number
- CN209868498U CN209868498U CN201920221258.2U CN201920221258U CN209868498U CN 209868498 U CN209868498 U CN 209868498U CN 201920221258 U CN201920221258 U CN 201920221258U CN 209868498 U CN209868498 U CN 209868498U
- Authority
- CN
- China
- Prior art keywords
- housing
- cover
- grinding wheel
- motor
- wheel cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model provides an electric tool and locking mechanical system. The electric tool has: a motor; a speed reduction mechanism connected to the motor; a housing that houses the motor and the reduction mechanism; a tip tool holding section connected to the speed reduction mechanism; a cover that covers at least a part of the tip tool holding portion; and a lock mechanism that switches the cover between a fixed state and an unfixed state with respect to the housing in accordance with an operation from a user. The cover can be mounted to the housing without the user operating the locking mechanism. According to the present invention, a technique capable of improving workability when installing a cover on a housing can be provided.
Description
Technical Field
The technology disclosed in this specification relates to a power tool and a lock mechanism.
Background
Patent document 1 discloses an electric power tool including: a motor; a speed reduction mechanism connected to the motor; a case that houses the motor and the speed reduction mechanism; a tip tool holding portion connected to the speed reduction mechanism; a cover that covers at least a part of the tip tool holding portion; and a lock mechanism that switches the cover between a fixed state and an unfixed state with respect to the housing in accordance with an operation from a user.
[ Prior art documents ]
[ patent document ]
Patent document 1: japanese patent laid-open publication No. 2014-133295
SUMMERY OF THE UTILITY MODEL
[ problem to be solved by the utility model ]
In the electric power tool of patent document 1, when the cover is attached to the housing, it is necessary to perform an operation of attaching the cover to the housing while operating the lock mechanism. A technique capable of improving workability in attaching the cover to the housing is desired.
[ technical means for solving problems ]
The present specification discloses an electric power tool. The electric tool has: a motor; a speed reduction mechanism connected to the motor; a case that houses the motor and the speed reduction mechanism; a tip tool holding portion connected to the speed reduction mechanism; a cover that covers at least a part of the tip tool holding portion; and a lock mechanism that switches the cover between a fixed state and an unfixed state with respect to the housing in accordance with an operation from a user. The cover is mountable to the housing without operation of the locking mechanism by the user.
According to the electric power tool, workability in attaching the cover to the housing can be improved.
The present specification also discloses another power tool. The electric tool has: a motor; a housing that houses the motor; an output portion protruding from the housing and rotated by the motor; a cover that covers at least a part of the output portion and is rotatable with respect to the housing; and a locking mechanism for preventing rotation of the shroud. The cover is provided with a plurality of holes, and the lock mechanism is provided with a projection engageable with the holes. The protrusion is configured to be slidable with respect to the housing.
According to the above electric power tool, the operation of switching between the state in which the projection is engaged with the hole and the state in which the projection is not engaged with the hole can be easily performed. The workability in attaching the cover to the housing can be improved.
The present specification discloses a locking mechanism. The lock mechanism switches a cover covering at least a part of the tip tool holding portion between a fixed state and an unfixed state with respect to a housing accommodating the motor and the speed reduction mechanism in accordance with an operation from a user. The cover is attachable to the housing without operation of the locking mechanism by the user.
According to the above-described lock mechanism, workability in attaching the cover to the housing can be improved.
Drawings
Fig. 1 is a longitudinal sectional view of a sander 2 according to the first embodiment.
Fig. 2 is a perspective view of a front portion of the sander 2 according to the first embodiment as viewed from the front left and upward.
Fig. 3 is a perspective view of the grinding wheel cover 12 of the grinding machine 2 according to the first embodiment.
Fig. 4 is a plan view of the grinding wheel cover 12 of the grinding machine 2 according to the first embodiment.
Fig. 5 is a perspective view of the bearing housing 10 and the lock mechanism 55 of the sander 2 according to the first embodiment, as viewed from the left rear side.
Fig. 6 is a cross-sectional view of the sander 2 of the first embodiment.
Fig. 7 is a perspective view of the front portion of the dresser 2 according to the first embodiment, as viewed from the rear right below, before the grinding wheel cover 12 is attached.
Fig. 8 is a perspective view of the front portion of the dresser 2 according to the first embodiment, when the grinding wheel cover 12 is attached, viewed from the front right below, in a state where the grinding wheel cover 12 is positioned at the attachment/detachment position.
Fig. 9 is a perspective view of a front portion of the sander 102 of the second embodiment as viewed from the front right upward.
Fig. 10 is a perspective sectional view of the bearing housing 10 and the lock mechanism 104 of the sander 102 according to the second embodiment, as viewed from the left rear side.
Fig. 11 is a perspective view of the lock plate 106 of the sander 102 according to the second embodiment.
Fig. 12 is a perspective view of a front portion of the dresser 102 according to the second embodiment, as viewed from the rear right below, before the grinding wheel cover 12 is attached.
Fig. 13 is a perspective view of the front portion of the dresser 102 according to the second embodiment, as viewed from the front right below, in a state where the grinding wheel cover 12 is attached and then the grinding wheel cover 12 is positioned at the attachment/detachment position.
Fig. 14 is a perspective view of a front portion of the sander 202 according to the third embodiment as viewed from the upper right.
Fig. 15 is a perspective view of the bearing housing 10 and the lock mechanism 204 of the sander 202 according to the third embodiment, as viewed from the left rear side.
Fig. 16 is a perspective view of the lock operation handle 206 of the sander 202 according to the third embodiment.
Fig. 17 is a perspective view of a front portion of the dresser 202 according to the third embodiment, as viewed from the rear right below, before the grinding wheel cover 12 is attached.
Fig. 18 is a perspective view of a front portion of the dresser 202 of the third embodiment, when viewed from the front right below, in a state where the grinding wheel cover 12 is attached and the grinding wheel cover 12 is positioned at the attachment/detachment position.
[ description of reference ]
2: a sander; 4: a motor housing; 6: a rear housing; 8: a gear housing; 10: a bearing housing; 10 a: a spring receiving part; 10 b: a pin receiving part; 12: grinding the wheel cover; 14: a motor; 16: an output shaft; 18: a bearing; 20: a bearing; 22: a circuit; 24: a power line; 26: a switch; 28: a first bevel gear; 30: a second bevel gear; 32: a main shaft; 34: a bevel gear; 36: a bearing; 38: a shaft locking member; 40: a bearing; 42: a housing; 44: a belt portion; 44 a: a snap-fit rib; 44 b: a snap-fit rib; 44 c: a snap-fit rib; 44 d: a through hole; 46: an upper surface portion; 46 a: a circular ring part; 46 b: a semicircular portion; 48: a side surface portion; 48 a: a semi-cylindrical portion; 48 b: shrinking the neck part; 50: a cover mounting portion; 52: a guide groove; 54: a flange; 54 a: a notch; 54 b: a notch; 54 c: a notch; 55: a locking mechanism; 56: locking the operating handle; 56 a: a base; 56 b: an operation section; 56 c: a support portion; 56 d: a locking part; 58 a: a screw; 58 b: a screw; 58 c: a screw; 58 d: a screw; 60: a sleeve; 62: a torsion spring; 102: a sander; 104: a locking mechanism; 106: a locking plate; 106 a: a base; 106 b: an operation section; 106 c: a long hole; 106 d: a long hole; 106 e: a locking part; 106 f: a first pillar portion; 106 g: a second column section; 106 h: a first convex portion; 106 i: a second convex portion; 108: a sleeve; 110: a sleeve; 112: a compression spring; 202: a sander; 204: a locking mechanism; 206: locking the operating handle; 206 a: a through hole; 206 b: a base; 206 c: a support portion; 206 d: an operation section; 206 e: a locking part; 206 f: a locking part; 206 g: a convex portion; 208: a support pin; 210: compressing the spring.
Detailed Description
In one or more embodiments, the power tool may have: a motor; a speed reduction mechanism connected to the motor; a case that houses the motor and the speed reduction mechanism; a tip tool holding portion connected to the speed reduction mechanism; a cover that covers at least a part of the tip tool holding portion; and a lock mechanism that switches the cover between a fixed state and an unfixed state with respect to the housing in accordance with an operation from a user. The cover is mountable to the housing without operation of the locking mechanism by the user.
According to the electric power tool, workability in attaching the cover to the housing can be improved.
In one or more embodiments, the locking mechanism may be provided to the housing.
Sometimes it is desirable to change the position of the cover after it is secured to the housing by a locking mechanism. In this case, it is necessary to perform an operation of moving the cover with respect to the housing while operating the lock mechanism. If the lock mechanism is provided on the cover, when the position of the cover relative to the housing is changed, the cover needs to be moved relative to the housing while operating the lock mechanism of the cover, which complicates the work. In the case where the lock mechanism is provided in the housing as in the above-described electric power tool, when the position of the cover with respect to the housing is changed, the cover may be moved with respect to the housing while operating the lock mechanism of the housing, and therefore, the work can be performed more easily.
In one or more embodiments, the cover may be fixed to the housing so as to cover between the lock mechanism and the tip tool holding portion when the electric power tool is in use.
According to the above configuration, dust generated by machining a workpiece with the tool at the tip end can be prevented from reaching the lock mechanism when the electric power tool is used. The operation of the lock mechanism can be prevented from being affected by dust from the workpiece.
In one or more embodiments, the locking mechanism may have: an engaging member that is movable between an engaging position where the engaging member is engaged with the cover and a releasing position where the engaging member is not engaged with the cover; and an elastic member that biases the engaging member from the release position to the engagement position. The engaging member may be moved from the engaging position to the releasing position against the biasing force of the elastic member by pressing from the cover when the cover is attached to the housing.
According to the electric power tool described above, the cover can be attached to the housing without operating the lock mechanism with a simple configuration.
In one or more embodiments, the power tool may have: a motor; a housing that houses the motor; an output portion protruding from the housing and rotated by the motor; a cover that covers at least a part of the output portion and is rotatable with respect to the housing; and a locking mechanism for preventing rotation of the shroud. A plurality of holes may be provided on the cover. The locking mechanism may be provided with a projection engageable with the hole. The protrusion may be configured to be slidable with respect to the housing.
According to the above electric power tool, the operation of switching between the state in which the projection is engaged with the hole and the state in which the projection is not engaged with the hole can be easily performed. The workability in attaching the cover to the housing can be improved.
In one or more embodiments, the projection may be configured to be slidable with respect to the housing in a direction intersecting a plane including a longitudinal direction of the housing and a rotation axis direction of the output unit.
According to the above electric power tool, the operation of switching between the state in which the projection is engaged with the hole and the state in which the projection is not engaged with the hole can be performed more easily. The workability in attaching the cover to the housing can be further improved.
(embodiment one)
As shown in fig. 1, the grinding machine 2 of the first embodiment has a motor housing 4, a rear housing 6, a gear housing 8, a bearing housing 10, and a grinding wheel cover 12.
The motor 14 is housed inside the motor case 4. The motor 14 has an output shaft 16 extending in the front-rear direction. The output shaft 16 is rotatably supported by the motor housing 4 via bearings 18 and 20.
The rear housing 6 is mounted behind the motor housing 4. The rear case 6 houses an electric circuit 22 therein. Power is supplied to the circuit 22 from an external power supply via a power cord 24. When the user operates the switch 26 (see fig. 2 and the like) to bring it into a closed (on) state, the circuit 22 supplies power to the motor 14, and when the user operates the switch 26 to bring it into an off state, the circuit 22 stops the supply of power to the motor 14. The motor 14 rotates the output shaft 16 by electric power supplied from the electric circuit 22.
The gear housing 8 is mounted in front of the motor housing 4. A first bevel gear 28 and a second bevel gear 30 disposed so as to mesh with each other are housed inside the gear housing 8. A first bevel gear 28 is fixed to the front end of the output shaft 16. The second bevel gear 30 is fixed to an upper end portion of a main shaft 32 extending in the vertical direction. Hereinafter, the first bevel gear 28 and the second bevel gear 30 will also be collectively referred to as the bevel gear 34. The bevel gear 34 is a speed reduction mechanism that reduces the speed of rotation of the motor 14 and transmits the rotation to the main shaft 32. The gear housing 8 holds the upper end portion of the main shaft 32 via a bearing 36. As shown in fig. 2, a shaft lock 38 is provided on the upper surface of the gear housing 8. When the user presses the shaft lock 38 downward, the second bevel gear 30 is inhibited from rotating, and the main shaft 32 is inhibited from rotating.
The bearing housing 10 is mounted below the gear housing 8. The bearing housing 10 holds the main shaft 32 via a bearing 40. The main shaft 32 is a rotation shaft extending in the vertical direction and is rotatable with respect to the bearing housing 10. The grinding wheel GW can be mounted at the lower end OF the main shaft 32 via the inner flange IF and the outer flange OF. In the sander 2, when the motor 14 rotates, the grinding wheel GW rotates around the rotation axis together with the spindle 32, whereby the workpiece can be ground. The spindle 32 may also be referred to as a tip tool holding portion that holds a tip tool, i.e., a grinding wheel GW. In the following description, the motor housing 4, the rear housing 6, the gear housing 8, and the bearing housing 10 are also collectively referred to as simply the housing 42.
A grinding wheel cover 12 is attached to the bearing housing 10. The grinding wheel cover 12 is formed in a shape covering at least a part of the grinding wheel GW. In the present embodiment, the grinding wheel cover 12 is formed in a shape covering a part of substantially a half circumference of the grinding wheel GW. In the example shown in fig. 1, the grinding wheel cover 12 is disposed at a position covering the rear portion of the grinding wheel GW. The grinding wheel cover 12 prevents grinding dust from flying from the grinding wheel GW to the user when the sander 2 is in use. Further, the grinding wheel cover 12 can also cover at least a portion of the spindle 32.
As shown in fig. 3, the grinding wheel cover 12 has a belt portion 44, an upper surface portion 46, and a side surface portion 48. The belt portion 44 has a substantially cylindrical shape extending in the vertical direction. As shown in fig. 4, the engagement ribs 44a, 44b, and 44c are formed on the inner circumferential surface of the belt portion 44, the engagement ribs 44a, 44b, and 44c protrude inward, and the circumferential direction of the inner circumferential surface is the longitudinal direction of the engagement ribs. The positions of the engaging ribs 44a, 44b, and 44c in the vertical direction coincide with each other. As shown in fig. 3, the band portion 44 has a plurality of through holes 44d formed therein at predetermined angular intervals within a predetermined angular range. The upper surface portion 46 has: a circular portion 46a radially expanded from a lower end of the band 44; and a semicircular portion 46b of a substantially semicircular shape extending in the radial direction from the outer end of the annular portion 46 a. The side surface portion 48 has: a semi-cylindrical portion 48a having a substantially semi-cylindrical shape and extending downward from an outer end of the semi-cylindrical portion 46 b; and a constricted portion 48b bent inward from the lower end of the semi-cylindrical portion 48 a.
As shown in fig. 5, a substantially cylindrical cover attachment portion 50 is formed on the bearing housing 10, and the cover attachment portion 50 protrudes downward in the rotational axis direction (i.e., the vertical direction) of the main shaft 32. An annular guide groove 52 is formed on the outer peripheral surface of the cover attachment portion 50 near the lower end thereof. A flange 54 projecting in the radial direction is formed on the lower end side of the guide groove 52. Notches 54a, 54b, and 54c are formed in the flange 54 so as to correspond to the engagement ribs 44a, 44b, and 44c of the grinding wheel cover 12. The notches 54a, 54b, 54c communicate with the guide groove 52.
Further, the bearing housing 10 is provided with a lock mechanism 55. The lock mechanism 55 includes a lock lever 56, a sleeve 60 (see fig. 6), and a torsion spring 62. The lock operation lever 56 has: a substantially cylindrical base 56 a; an operating portion 56b of a substantially rectangular parallelepiped shape extending linearly leftward and forward from the base portion 56 a; a substantially rectangular parallelepiped support portion 56c linearly extending rightward from the base portion 56 a; and a locking portion 56d protruding forward from the distal end of the support portion 56 c. The locking portion 56d has a tapered shape in which the lower surface is inclined and the dimension in the vertical direction decreases as it approaches the tip end. The lock operation lever 56 is attached to a screw 58c disposed on the rear left of the screws 58a, 58b, 58c, and 58d, and the screws 58a, 58b, 58c, and 58d are used to fix the bearing housing 10 to the gear housing 8. As shown in fig. 6, a screw 58c extends in the vertical direction and penetrates the base portion 56a of the lock lever 56 to fasten the sleeve 60, the bearing housing 10, and the gear housing 8. The lock operation lever 56 is held by a screw 58c so as to be rotatable about a rotation shaft (rotation axis) extending in the up-down direction. A torsion spring 62 is disposed around the sleeve 60. As shown in fig. 5, when the bearing housing 10 is viewed from below, the torsion spring 62 biases the lock lever 56 in a clockwise direction with respect to the bearing housing 10, i.e., in a direction in which the locking portion 56d approaches the cover attachment portion 50.
As shown in fig. 7, when the grinding wheel cover 12 is attached to the dresser 2, the grinding wheel cover 12 is slid upward with respect to the bearing housing 10 so that the cover attachment portion 50 is inserted into the inside of the belt portion 44, with the engagement ribs 44a, 44b, and 44c of the grinding wheel cover 12 and the notches 54a, 54b, and 54c of the cover attachment portion 50 aligned. At this time, although the lower surface of the locking portion 56d of the lock lever 56 abuts against the upper surface of the band portion 44, since the locking portion 56d has a tapered shape with an inclined lower surface, the lock lever 56 is pressed by the grinding wheel cover 12, and the locking portion 56d is rotated in a direction away from the cover attachment portion 50 against the urging force of the torsion spring 62, so that the grinding wheel cover 12 can be attached to the bearing housing 10 as shown in fig. 8. In this state, the biasing force of the torsion spring 62 acts on the lock lever 56, and the tip end of the locking portion 56d is pressed against the outer peripheral surface of the band portion 44. Hereinafter, the position of the grinding wheel cover 12 after being attached to the bearing housing 10 with the engagement ribs 44a, 44b, and 44c and the notches 54a, 54b, and 54c aligned is also referred to as an attachment/detachment position.
The grinding wheel cover 12 mounted on the bearing housing 10 is rotatable about the cover mounting portion 50. In other words, the grinding wheel cover 12 is rotatable about the rotation axis direction (i.e., the vertical direction) of the main shaft 32 with respect to the bearing housing 10. When the grinding wheel cover 12 is rotated from the mounting position with respect to the bearing housing 10, the engagement ribs 44a, 44b, and 44c slide in the guide groove 52, and the flange 54 engages with the engagement ribs 44a, 44b, and 44c, thereby prohibiting the grinding wheel cover 12 from sliding downward with respect to the bearing housing 10. In this case, the grinding wheel cover 12 cannot be detached from the bearing housing 10.
When the grinding wheel cover 12 is rotated relative to the bearing housing 10 and the locking portion 56d of the lock lever 56 is aligned with one of the through holes 44d of the band portion 44, the locking portion 56d enters the through hole 44d by the urging force of the torsion spring 62. In this state, since the grinding wheel cover 12 is engaged with the lock lever 56, the grinding wheel cover 12 is prevented from rotating relative to the bearing housing 10, and the grinding wheel cover 12 is fixed to the bearing housing 10. When the rotation angle of the grinding wheel cover 12 with respect to the bearing housing 10 is changed, the operating portion 56b of the lock lever 56 is pressed to bring the locking portion 56d into a state of coming out of the through hole 44d, whereby the grinding wheel cover 12 can be rotated with respect to the bearing housing 10. By appropriately selecting the through hole 44d aligned with the locking portion 56d, the rotation angle at which the grinding wheel cover 12 is fixed to the bearing housing 10 can be selected. In a state where the locking portion 56d is inserted into any one of the through holes 44d, the gap between the lock mechanism 55 and the spindle 32 is blocked by the grinding wheel cover 12.
When the grinding wheel cover 12 is detached from the bearing housing 10, the grinding wheel cover 12 is rotated to the attachment/detachment position with respect to the bearing housing 10 as shown in fig. 8 while pressing the operation portion 56b of the lock operation lever 56. In this state, the engagement ribs 44a, 44b, and 44c are aligned with the notches 54a, 54b, and 54c, and allow the grinding wheel cover 12 to slide downward with respect to the bearing housing 10. In this case, the grinding wheel cover 12 can be detached from the bearing housing 10.
As described above, the grinding machine 2 (an example of the electric power tool) according to the embodiment includes: a motor 14; a bevel gear 34 (an example of a speed reduction mechanism) connected to the motor 14; a housing 42 that houses the motor 14 and the bevel gear 34; a main shaft 32 (an example of a tip tool holding portion) connected to a bevel gear 34; a grinding wheel cover 12 (an example of a cover) that covers at least a part of the main shaft 32; and a lock mechanism 55 for switching the grinding wheel cover 12 between a fixed state and an unfixed state with respect to the housing 42 in accordance with an operation from a user. The grinding wheel cover 12 can be mounted to the housing 42 without the user operating the locking mechanism 55.
In the sander 2 according to an embodiment, the lock mechanism 55 is provided in the housing 42.
In the dresser 2 according to the embodiment, the grinding wheel cover 12 is fixed to the housing 42 so as to block the space between the lock mechanism 55 and the spindle 32 when the dresser 2 is used.
In the sander 2 according to an embodiment, the lock mechanism 55 includes: a lock operation lever 56 (an example of an engaging member) that is movable between an engaging position where it engages with the grinding wheel cover 12 and a releasing position where it does not engage with the grinding wheel cover 12; and a torsion spring 62 (an example of an elastic member) that biases the lock lever 56 from the release position to the engagement position. When the grinding wheel cover 12 is attached to the housing 42, the lock lever 56 is moved from the engagement position to the release position against the biasing force of the torsion spring 62 by the pressing force from the grinding wheel cover 12.
(second embodiment)
The sander 102 of the present embodiment has the same structure as the sander 2 of the first embodiment. Only the differences from the sander 2 of the first embodiment will be described in detail below.
As shown in fig. 9, the sander 102 of the present embodiment has a locking mechanism 104 instead of the locking mechanism 55 of the first embodiment. As shown in fig. 10, the locking mechanism 104 has a locking plate 106, sleeves 108, 110 and a compression spring 112.
As shown in fig. 11, the lock plate 106 has a flat plate-shaped base portion 106a, an operation portion 106b, elongated holes 106c and 106d, a locking portion 106e, a first column portion 106f, a second column portion 106g, a first convex portion 106h, and a second convex portion 106i, wherein the base portion 106a is shaped so as not to interfere with the gear housing 8 and the bearing housing 10 and extends in the left-right direction; the operating portion 106b extends upward from the left end of the base portion 106 a; the long holes 106c, 106d are formed in the base portion 106a, and the left-right direction is the longitudinal direction thereof; the locking portion 106e protrudes to the left side in the vicinity of the right side end portion of the base portion 106 a; the first column portion 106f and the second column portion 106g protrude upward between the long hole 106c and the long hole 106d of the base portion 106 a; the first convex portion 106h extends rightward (toward the second column portion 106g) from the first column portion 106 f; the second convex portion 106i extends leftward (toward the first pillar portion 106f) from the second pillar portion 106 g. The engaging portion 106e has a tapered shape in which the lower surface is inclined and the dimension in the vertical direction decreases as it approaches the tip end.
As shown in fig. 10, the lock plate 106 is attached to the screw 58c disposed on the rear left side and the screw 58d disposed on the rear right side, among the screws 58a, 58b, 58c, 58d that fix the bearing housing 10 to the gear housing 8. The screw 58c extends in the vertical direction, and penetrates through the elongated hole 106c of the lock plate 106 to fasten the sleeve 108, the bearing housing 10, and the gear housing 8. The screw 58d extends in the vertical direction, penetrates the elongated hole 106d of the lock plate 106, and fastens the sleeve 110, the bearing housing 10, and the gear housing 8. The lock plate 106 is held by the screws 58c, 58d so as to be slidable in the left-right direction.
In the dresser 102 of the present embodiment, a spring receiving portion 10a is formed in the bearing housing 10. The compression spring 112 is attached to the lock plate 106 in a state where one end is inserted into the first convex portion 106h and the other end is inserted into the second convex portion 106 i. The lock plate 106 is attached to the bearing housing 10 such that the end of the compression spring 112 on the second convex portion 106i side abuts against the spring receiving portion 10 a. Therefore, the compression spring 112 biases the lock plate 106 leftward with respect to the bearing housing 10, i.e., in a direction in which the locking portion 106e approaches the cover mounting portion 50.
As shown in fig. 12, when the grinding wheel cover 12 is attached to the dresser 102, the grinding wheel cover 12 is slid upward relative to the bearing housing 10 so that the cover attachment portion 50 is inserted into the inside of the belt portion 44, with the engagement ribs 44a, 44b, and 44c of the grinding wheel cover 12 aligned with the notches 54a, 54b, and 54c of the cover attachment portion 50. At this time, the lower surface of the locking portion 106e of the lock plate 106 abuts against the upper surface of the band portion 44, but since the locking portion 106e has a tapered shape with an inclined lower surface, the lock plate 106 is pressed by the grinding wheel cover 12, and slides rightward, even if the locking portion 106e is away from the cover attachment portion 50, against the biasing force of the compression spring 112, and the grinding wheel cover 12 can be attached to the bearing housing 10 as shown in fig. 13. In this state, the biasing force of the compression spring 112 acts on the lock plate 106, and the tip end of the locking portion 106e is pressed against the outer peripheral surface of the band portion 44.
When the grinding wheel cover 12 is attached to the dresser 102, the operation portion 106b of the lock plate 106 is pressed rightward and the engagement portion 106e is disengaged from the through hole 44d, and in this state, the grinding wheel cover 12 can be attached by sliding upward with respect to the bearing housing 10.
When the grinding wheel cover 12 is rotated from the mounting position with respect to the bearing housing 10, the engagement ribs 44a, 44b, and 44c slide in the guide groove 52, and the flange 54 engages with the engagement ribs 44a, 44b, and 44c, thereby prohibiting the grinding wheel cover 12 from sliding downward with respect to the bearing housing 10. In this case, the grinding wheel cover 12 cannot be detached from the bearing housing 10.
When the grinding wheel cover 12 is rotated relative to the bearing housing 10 and the locking portion 106e of the lock plate 106 is aligned with one of the through holes 44d of the band portion 44, the locking portion 106e enters the through hole 44d by the biasing force of the compression spring 112. In this state, since the grinding wheel cover 12 is engaged with the lock plate 106, the grinding wheel cover 12 is prevented from rotating relative to the bearing housing 10, and the grinding wheel cover 12 is fixed to the bearing housing 10. When the rotation angle of the grinding wheel cover 12 with respect to the bearing housing 10 is changed, the operating portion 106b of the lock plate 106 is pressed rightward, and the locking portion 106e is disengaged from the through hole 44d, whereby the grinding wheel cover 12 can be rotated with respect to the bearing housing 10. By appropriately selecting the through hole 44d aligned with the locking portion 106e, the rotation angle at which the grinding wheel cover 12 is fixed to the bearing housing 10 can be selected. In a state where the locking portion 106e is inserted into any one of the through holes 44d, the gap between the lock mechanism 104 and the spindle 32 is blocked by the grinding wheel cover 12.
When the grinding wheel cover 12 is detached from the bearing housing 10, the grinding wheel cover 12 is rotated to the attachment/detachment position with respect to the bearing housing 10 as shown in fig. 13 while pressing the operation portion 106b of the lock plate 106. In this state, the engagement ribs 44a, 44b, and 44c are aligned with the notches 54a, 54b, and 54c, and allow the grinding wheel cover 12 to slide downward with respect to the bearing housing 10. In this case, the grinding wheel cover 12 can be detached from the bearing housing 10.
In the dresser 102 of the present embodiment, the lock plate 106 can be switched between the state in which the rotation of the grinding wheel cover 12 is permitted and the state in which the rotation of the grinding wheel cover 12 is prohibited by a simple operation of sliding the lock plate in the left-right direction with respect to the bearing housing 10.
As described above, the grinding machine 102 (an example of the electric power tool) according to the embodiment includes: a motor 14; a bevel gear 34 (an example of a speed reduction mechanism) connected to the motor 14; a housing 42 that houses the motor 14 and the bevel gear 34; a main shaft 32 (an example of a tip tool holding portion) connected to a bevel gear 34; a grinding wheel cover 12 (an example of a cover) that covers at least a part of the main shaft 32; and a lock mechanism 104 that switches the grinding wheel cover 12 between a fixed state and an unfixed state with respect to the housing 42 in accordance with an operation from a user. The grinding wheel cover 12 can be mounted to the housing 42 without the user operating the locking mechanism 104.
In the sander 102 according to an embodiment, the lock mechanism 104 is provided in the housing 42.
In the dresser 102 according to an embodiment, the grinding wheel cover 12 is fixed to the housing 42 so as to block the space between the lock mechanism 104 and the spindle 32 when the dresser 102 is in use.
In a sander 102 according to an embodiment, a lock mechanism 104 includes: a lock plate 106 (an example of an engagement member) that is movable between an engagement position where it is engaged with the grinding wheel cover 12 and a release position where it is not engaged with the grinding wheel cover 12; and a compression spring 112 (an example of an elastic member) that biases the lock plate 106 from the release position to the engagement position. When the grinding wheel cover 12 is attached to the housing 42, the lock plate 106 is moved from the engagement position to the release position against the biasing force of the compression spring 112 by the pressing force from the grinding wheel cover 12.
The sander 102 (an example of an electric power tool) according to the embodiment includes: a motor 14; a housing 42 that houses the motor 14; a main shaft 32 (an example of an output unit) protruding from the housing 42 and rotated by the motor 14; a grinding wheel cover 12 (an example of a cover) that covers at least a part of the spindle 32 and is rotatable with respect to the housing 42; and a locking mechanism 104 for preventing rotation of the grinding wheel cover 12. The grinding wheel cover 12 is provided with a plurality of through holes 44d (an example of a hole). The lock mechanism 104 is provided with a locking portion 106e (an example of a protrusion) that can be engaged with the through hole 44 d. The locking portion 106e is configured to be slidable with respect to the housing 42.
In the sander 102 according to an embodiment, the locking portion 106e is configured to be slidable in the left-right direction with respect to the housing 42 (an example of a direction intersecting a plane including the longitudinal direction (front-rear direction) of the housing 42 and the rotation axis direction (vertical direction) of the spindle 32).
(third embodiment)
The sander 202 of the present embodiment has the same structure as the sander 2 of the first embodiment. Only the differences from the sander 2 of the first embodiment will be described in detail below.
As shown in fig. 14, a grinding machine 202 of the present embodiment has a lock mechanism 204 instead of the lock mechanism 55 of the first embodiment. As shown in fig. 15, the locking mechanism 204 has a locking lever 206, a support pin 208, and a compression spring 210.
As shown in fig. 16, the lock operation lever 206 has a base portion 206b, a support portion 206c of a substantially rectangular parallelepiped shape, an operation portion 206d, locking portions 206e, 206f, and a convex portion 206g, wherein a through hole 206a extending in the left-right direction is formed in the base portion 206 b; the support portion 206c extends leftward from the base portion 206b at a position offset downward with respect to the through hole 206 a; the operation portion 206d extends downward from the distal end of the support portion 206 c; the locking portions 206e and 206f protrude forward from the base portion 206b at positions offset forward with respect to the through hole 206 a; the protruding portion 206g extends upward from the base portion 206b at a position shifted rearward with respect to the through hole 206 a. The locking portions 206e and 206f have a cam shape on the lower surface.
As shown in fig. 15, in the grinding machine 202 of the present embodiment, a pin receiving portion 10b is formed in the bearing housing 10. The support pin 208 is inserted through the through hole 206a of the lock lever 206, and both ends thereof are held by the pin receiving portion 10b of the bearing housing 10. Therefore, the lock operation lever 206 is rotatably held by the bearing housing 10 with the left-right direction as a rotation axis (rotation axis). The compression spring 210 is attached to the lock operation lever 206 in a state of being temporarily inserted into the convex portion 206 g. The lock lever 206 is attached to the bearing housing 10 such that the other end of the compression spring 210 abuts against the lower surface of the bearing housing 10. Therefore, when the bearing housing 10 is viewed from the left, the compression spring 210 biases the lock lever 206 in a clockwise direction with respect to the bearing housing 10, i.e., in a direction in which the locking portions 206e and 206f approach the cover attachment portion 50.
As shown in fig. 17, when the grinding wheel cover 12 is attached to the dresser 202, the grinding wheel cover 12 is slid upward with respect to the bearing housing 10 so that the cover attachment portion 50 is inserted into the inside of the belt portion 44, with the engagement ribs 44a, 44b, and 44c of the grinding wheel cover 12 and the notches 54a, 54b, and 54c of the cover attachment portion 50 aligned. At this time, the lower surfaces of the locking portions 206e and 206f of the lock lever 206 abut against the upper surface of the band portion 44, but since the lower surfaces of the locking portions 206e and 206f have a cam shape, the lock lever 206 is pressed by the grinding wheel cover 12, and the locking portions 206e and 206f are rotated in a direction away from the cover attachment portion 50 against the urging force of the compression spring 210, whereby the grinding wheel cover 12 can be attached to the bearing housing 10 as shown in fig. 18. In this state, the biasing force of the compression spring 210 acts on the lock operation lever 206, and the distal ends of the locking portions 206e and 206f are pressed against the outer peripheral surface of the band portion 44.
When the grinding wheel cover 12 is attached to the grinding machine 202, the operation portion 206d of the lock operation lever 206 is rotated rearward and upward, and the locking portions 206e and 206f are disengaged from the through hole 44d, and in this state, the grinding wheel cover 12 can be attached by sliding upward with respect to the bearing housing 10.
When the grinding wheel cover 12 is rotated from the mounting position with respect to the bearing housing 10, the engagement ribs 44a, 44b, and 44c slide in the guide groove 52, and the flange 54 engages with the engagement ribs 44a, 44b, and 44c, thereby prohibiting the grinding wheel cover 12 from sliding downward with respect to the bearing housing 10. In this case, the grinding wheel cover 12 cannot be detached from the bearing housing 10.
When the grinding wheel cover 12 is rotated relative to the bearing housing 10 and the locking portions 206e and 206f of the lock lever 206 are aligned with two positions of the plurality of through holes 44d of the belt portion 44, the locking portions 206e and 206f enter the corresponding through holes 44d by the biasing force of the compression spring 210. In this state, since the grinding wheel cover 12 is engaged with the lock lever 206, the grinding wheel cover 12 is prevented from rotating relative to the bearing housing 10, and the grinding wheel cover 12 is fixed to the bearing housing 10. When the rotation angle of the grinding wheel cover 12 with respect to the bearing housing 10 is changed, the operating portion 206d of the lock lever 206 is rotated rearward and upward, and the locking portions 206e and 206f are disengaged from the through hole 44d, whereby the grinding wheel cover 12 can be rotated with respect to the bearing housing 10. By appropriately selecting the through-hole 44d aligned with the locking portions 206e and 206f, the rotation angle at which the grinding wheel cover 12 is fixed to the bearing housing 10 can be selected. In a state where the locking portions 206e and 206f enter any one of the through holes 44d, the gap between the lock mechanism 204 and the spindle 32 is blocked by the grinding wheel cover 12.
When the grinding wheel cover 12 is detached from the bearing housing 10, the grinding wheel cover 12 is rotated to the attachment/detachment position with respect to the bearing housing 10 as shown in fig. 18 while rotating the operation portion 206d of the lock operation lever 206 rearward and upward. In this state, the engagement ribs 44a, 44b, and 44c are aligned with the notches 54a, 54b, and 54c, and allow the grinding wheel cover 12 to slide downward with respect to the bearing housing 10. In this case, the grinding wheel cover 12 can be detached from the bearing housing 10.
In the dresser 202 of the present embodiment, switching between a state in which rotation of the grinding wheel cover 12 is permitted and a state in which rotation of the grinding wheel cover 12 is prohibited can be performed by a simple operation of rotating the lock operation lever 206 relative to the bearing housing 10 about the rotation shaft extending in the left-right direction.
As described above, the grinding machine 202 (an example of the electric power tool) according to the embodiment includes: a motor 14; a bevel gear 34 (an example of a speed reduction mechanism) connected to the motor 14; a housing 42 that houses the motor 14 and the bevel gear 34; a main shaft 32 (an example of a tip tool holding portion) connected to a bevel gear 34; a grinding wheel cover 12 (an example of a cover) that covers at least a part of the main shaft 32; and a lock mechanism 204 that switches the grinding wheel cover 12 between a fixed state and an unfixed state with respect to the housing 42 in accordance with an operation from a user. The grinding wheel cover 12 can be mounted to the housing 42 without the user operating the locking mechanism 204.
In the sander 202 according to an embodiment, the lock mechanism 204 is provided in the housing 42.
In the dresser 202 according to an embodiment, the grinding wheel cover 12 is fixed to the housing 42 so as to block a gap between the lock mechanism 204 and the spindle 32 when the dresser 202 is used.
In a grinding machine 202 according to an embodiment, a lock mechanism 204 includes: a lock lever 206 (an example of an engaging member) that is rotatable between an engaging position where it engages with the grinding wheel cover 12 and a releasing position where it does not engage with the grinding wheel cover 12; and a compression spring 210 (an example of an elastic member) that biases the lock lever 206 from the release position to the engagement position. When the grinding wheel cover 12 is attached to the housing 42, the lock lever 206 is rotated from the engagement position to the release position against the biasing force of the compression spring 210 by the pressing force from the grinding wheel cover 12.
In the above embodiments, the case where the electric tool is the dresser 2, 102, 202, the tip tool holding portion is the spindle 32, and the cover is the grinding wheel cover 12 has been described as an example, but the electric tool may be another type of electric tool, the tip tool holding portion may be another type of tip tool holding portion, and the cover may be another type of cover.
While specific examples of the present invention have been described in detail, these are merely illustrative and do not limit the scope of the claims. The technique described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in the specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Further, the techniques exemplified in the present specification or the drawings can achieve a plurality of objects at the same time, and technical usefulness can be achieved by achieving one of the objects.
Claims (12)
1. An electric tool is characterized in that the electric tool is provided with a power supply unit,
comprising: a motor;
a speed reduction mechanism connected to the motor;
a case that houses the motor and the speed reduction mechanism;
a tip tool holding portion connected to the speed reduction mechanism;
a cover that covers at least a part of the tip tool holding portion; and
a lock mechanism that switches the cover between a fixed state and an unfixed state with respect to the housing in accordance with an operation from a user,
the cover is mountable to the housing without operation of the locking mechanism by the user.
2. The power tool of claim 1,
the locking mechanism is disposed on the housing.
3. The power tool of claim 2,
the cover is fixed to the housing so as to cover between the lock mechanism and the tip tool holding portion when the electric power tool is in use.
4. The power tool according to claim 2 or 3,
the lock mechanism has:
an engaging member that is movable between an engaging position where the engaging member is engaged with the cover and a releasing position where the engaging member is not engaged with the cover; and
an elastic member that biases the engaging member from the release position to the engagement position,
the engaging member is moved from the engaging position to the releasing position against the biasing force of the elastic member by the pressing force from the cover when the cover is attached to the housing.
5. The power tool of claim 4,
the engaging member is tapered.
6. The power tool of claim 5,
the lock mechanism further has:
a base portion extending in a left-right direction; and
an operating portion provided at one end of the base portion,
the engaging member is provided near an end of the base.
7. The power tool of claim 6,
a screw fixing the housing penetrates the long hole of the base,
the lock mechanism is attached to the housing so as to be movable in the left-right direction.
8. An electric tool is characterized in that the electric tool is provided with a power supply unit,
comprising: a motor;
a housing that houses the motor;
an output portion protruding from the housing and rotated by the motor;
a cover that covers at least a part of the output portion and is rotatable with respect to the housing; and
a locking mechanism for preventing rotation of the shroud,
a plurality of holes are arranged on the cover,
the locking mechanism is provided with a projection capable of being engaged with the hole,
the protrusion is configured to be slidable with respect to the housing.
9. The power tool of claim 8,
the projection is configured to be slidable relative to the housing in a direction intersecting a plane including a longitudinal direction of the housing and a rotation axis direction of the output unit.
10. A locking mechanism is characterized in that a locking mechanism is provided,
a cover that covers at least a part of a tip tool holding section is switched between a fixed state and an unfixed state with respect to a housing that houses a motor and a speed reduction mechanism, according to an operation from a user, and the cover is attachable to the housing without the user operating the lock mechanism.
11. The locking mechanism of claim 10,
the locking mechanism is disposed on the housing.
12. The locking mechanism of claim 10,
the lock mechanism is configured to be rotatable with respect to the housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-028982 | 2018-02-21 | ||
| JP2018028982A JP7089326B2 (en) | 2018-02-21 | 2018-02-21 | Electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209868498U true CN209868498U (en) | 2019-12-31 |
Family
ID=67771626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920221258.2U Active CN209868498U (en) | 2018-02-21 | 2019-02-21 | Power tool and locking mechanism |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7089326B2 (en) |
| CN (1) | CN209868498U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743492A (en) * | 2020-11-24 | 2021-05-04 | 上海器外文化科技有限公司 | Main unit and electric tool |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10343060A1 (en) * | 2003-09-16 | 2005-04-07 | Robert Bosch Gmbh | Protective cowl for hand power tool especially for angle grinder has an adjustable fitting with a finger pressure ratchet lever engaging ratchet holes in cowl mounting |
| JP2014133295A (en) * | 2013-01-11 | 2014-07-24 | Makita Corp | Grinder |
| JP6599680B2 (en) * | 2015-07-30 | 2019-10-30 | 理研計器株式会社 | Portable gas alarm |
| JP6689054B2 (en) * | 2015-10-23 | 2020-04-28 | コイト電工株式会社 | Assembling structure of two members, and a lighting fixture provided with the assembling structure |
| EP3251791B1 (en) * | 2016-05-06 | 2019-03-27 | Black & Decker Inc. | Reversible lever for a guard assembly for a power tool |
-
2018
- 2018-02-21 JP JP2018028982A patent/JP7089326B2/en active Active
-
2019
- 2019-02-21 CN CN201920221258.2U patent/CN209868498U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743492A (en) * | 2020-11-24 | 2021-05-04 | 上海器外文化科技有限公司 | Main unit and electric tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7089326B2 (en) | 2022-06-22 |
| JP2019141960A (en) | 2019-08-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10144110B2 (en) | Work tool | |
| EP2361732B1 (en) | Power tool having off-lock member | |
| CN106466862B (en) | Working tool | |
| US8784164B2 (en) | Power tool with a shield | |
| US8316957B2 (en) | Hand-held power tool | |
| JPH0579466B2 (en) | ||
| JP5959421B2 (en) | Grinder | |
| EP3081335A2 (en) | Guard assembly for a power tool | |
| CN111645036A (en) | Working tool | |
| CN209868498U (en) | Power tool and locking mechanism | |
| EP3112090A1 (en) | Electric tool | |
| CN209774565U (en) | electric tool | |
| WO2020241086A1 (en) | Electric tool | |
| GB2461783A (en) | Rotationally adjustable power tool protective hood | |
| WO2017222049A1 (en) | Electric power tool | |
| JP7001491B2 (en) | Electric tool | |
| JP2017202537A (en) | Battery adapter device | |
| EP3593950A1 (en) | Work tool | |
| CN112533735B (en) | Electric tool | |
| CN113165138A (en) | Working machine | |
| WO2019171721A1 (en) | Electrically powered tool | |
| JP4955308B2 (en) | Fastener supply device | |
| JP2020006483A (en) | Electric power tool | |
| US20230158630A1 (en) | Tool | |
| KR20220143461A (en) | Grinder having Wheel Cover |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |