CN212553188U - Detachable dust cover for belt grinder and belt grinder - Google Patents

Abstract

The utility model relates to a reassembling type dust cover and belt grinder that belt grinder used, this belt grinder can restrain the dust loss and can not make the operability when the abrasive band is changed descend. A detachable dust cover for a belt grinder is provided with a cover body having a plate-like portion extending in a first direction and a second direction orthogonal to the first direction. The detachable dust cover further includes: a first elastic part having elasticity; and a second elastic part having elasticity. The first elastic portion and the second elastic portion are separated from each other in the first direction, and are located on the same side with respect to the plate-like portion in a third direction orthogonal to the first direction and the second direction when viewed from the first direction. The first elastic portion is elastically deformable in a direction from the second elastic portion toward the first elastic portion in the first direction. The second elastic portion is elastically deformable in a direction from the first elastic portion toward the second elastic portion in the first direction.

Description

Detachable dust cover for belt grinder and belt grinder

Technical Field

The utility model relates to a belt grinder.

Background

As a tool for grinding wooden or metal products, a belt grinder is known. There are various forms of belt grinders, and as 1 form thereof, a belt grinder having an arm is known. This type of belt grinder is provided with: a grip portion for a user to grip; a drive roller rotated by a motor; an arm; a driven roller provided at the front end of the arm; and an annular abrasive belt hung between the driving roller and the driven roller. The object to be ground can be ground by bringing an endless abrasive belt rotating between a drive roller and a driven roller into contact with the object to be ground.

In such a belt grinder, according to the regulations of safety standards, the outside in the direction in which the rotation axis of the drive roller extends (hereinafter referred to as the axial direction) is covered with a cover (generally referred to as a safety cover). For example, patent document 1 listed below discloses a belt grinder including a cover (generally referred to as a pulley cover) that surrounds a drive roller and a part of an abrasive belt in a substantially U-shape in a rotational direction of the abrasive belt, in addition to the safety cover. The belt grinder ensures a clearance of a U shape opened in the axial direction between the safety cover and the pulley cover. When the sanding belt is worn, the user can easily perform a change of sanding belt by using the gap.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2002-233942

SUMMERY OF THE UTILITY MODEL

However, in the belt grinder described in patent document 1, since dust generated by the grinding with the abrasive belt escapes to the outside of the belt grinder through the gap, there is a possibility that the working environment may be deteriorated. Therefore, it is desirable to suppress the escape of dust without causing a reduction in workability at the time of replacement of the sanding belt.

According to an aspect of the present invention, there is provided a detachable dust cover for a belt grinder. The detachable dust cover includes a cover body. The cover main body has a plate-like portion extending in a first direction and a second direction orthogonal to the first direction. The detachable dust cover further includes: a first elastic part having elasticity; and a second elastic part having elasticity. The first elastic portion and the second elastic portion are separated from each other in a first direction, and are located on the same side with respect to the plate-like portion in a third direction orthogonal to the first direction and the second direction when viewed from the first direction. The first elastic portion is elastically deformable in a direction from the second elastic portion toward the first elastic portion in the first direction, and the second elastic portion is elastically deformable in a direction from the first elastic portion toward the second elastic portion in the first direction.

The detachable dust cover can be used with, for example, a belt grinder including: a motor; a drive roller configured to rotate around a rotation axis by a driving force of a motor; an arm; a driven roller; the annular abrasive belt is hung between the driving roller and the driven roller; and a first cover that surrounds the drive roller and a part of the abrasive belt in a substantially U-shape in the rotational direction of the abrasive belt. Specifically, the detachable dust cover may be configured such that the direction in which the arm extends is the second direction and the direction in which the rotation axis extends is the third direction, and the first elastic portion and the second elastic portion are attached to the belt grinder so as to sandwich the first cover. When the detachable dust cover is attached to the belt grinder in the above-described manner, the first cover presses the first elastic portion and the second elastic portion to elastically deform the detachable dust cover, and the positional relationship between the cover main body and the first cover is maintained by the restoring force of the elastic deformation. According to the detachable dust cover of this aspect, the periphery of the drive roller can be covered without a gap, and dust dissipation can be suppressed. Further, since the detachable dust cover can be easily attached and detached by the elastic deformation of the first elastic portion and the second elastic portion, it can be detached without using a tool when replacing the sanding belt. Therefore, the workability in replacing the sanding belt is not degraded. The substantially U-shape is a shape having a first straight line portion, a second straight line portion, and a portion (which may be circular-arc-shaped or linear) connecting the first straight line portion and the second straight line portion, and the first straight line portion and the second straight line portion may have different lengths from each other.

According to an aspect of the present invention, the first elastic portion and the second elastic portion may be disposed at the same position in the second direction. According to this aspect, when the detachable dust cover is attached, the first elastic portion and the second elastic portion can press the first cover in the opposite direction at the same position in the second direction by the restoring force of the elastic deformation. Therefore, the restoring force does not act in the direction in which the cover main body rotates, and as a result, the positional relationship between the cover main body and the first cover can be stably maintained. In addition, even if an error occurs in the dimensional relationship between the cover main body and the first cover, the error can be absorbed by the elastic deformation of the first elastic portion and the second elastic portion. Therefore, the dimensional accuracy required for the cover main body and the first cover can be reduced.

According to the utility model discloses a mode, reassembling type dust cover can possess: a first holding portion that holds the first elastic portion in a detachable manner; and a second holding portion that holds the second elastic portion detachably. According to this aspect, when the first elastic portion and the second elastic portion are deteriorated or damaged, the detachable dust cover can be continuously used only by replacing the first elastic portion and the second elastic portion. Therefore, user convenience is improved.

According to an aspect of the present invention, the first elastic portion and the second elastic portion may be rubber pins, respectively. According to this aspect, the detachable dust cover can be manufactured inexpensively and easily by using the rubber pin which is an inexpensive general-purpose product. In addition, since the rubber pin is easily available, user convenience when replacement is required is also improved.

According to an aspect of the present invention, the first holding portion and the second holding portion may be provided with grooves for holding the rubber pins in a partially fitted state, respectively. According to this aspect, the rubber pin can be attached and detached with a simple structure.

According to the utility model discloses a mode, the ascending one side in the direction that the groove extends can be sealed, and the opposite side can be the opening. According to this aspect, if the rubber pin is disposed so as to abut against the one-side closed portion, the rubber pin can be easily positioned. This aspect is particularly effective when the first elastic portion and the second elastic portion are arranged at the same position in the second direction.

According to an aspect of the present invention, the cover main body may include a peripheral wall portion extending in the third direction from an outer edge portion of the plate-like portion. The peripheral wall portion may be located on the same side as the first elastic portion and the second elastic portion with respect to the plate-like portion in the third direction. The detachable dust cover of this aspect can be attached to the belt grinder so that the peripheral wall portion covers the outer edge portion of the first cover from the outside. According to this aspect, the dust can be further suppressed from escaping. In addition, when the detachable dust cover is assembled, the first cover and the detachable dust cover can be easily aligned.

According to an aspect of the present invention, there is provided a detachable dust cover for a belt grinder, the dust cover including a cover main body. This detachable dust cover is provided with: a first elastic part having elasticity; and a second elastic part having elasticity. The detachable dust cover is composed of: when the cover main body is disposed so that the first elastic portion and the second elastic portion sandwich a part of the belt grinder, the first elastic portion and the second elastic portion are elastically deformed by being pressed by the part of the belt grinder, and the positional relationship between the cover main body and the part of the belt grinder is maintained by a restoring force of the elastic deformation. The above-described effects can also be obtained by such a detachable dust cover.

According to an aspect of the present invention, there is provided a belt grinder including the detachable dust cover according to any one of the above aspects.

According to an aspect of the present invention, the belt grinder may further include a second cover on the basis of the first cover. The second cover may be disposed substantially orthogonal to the rotation axis and covers the drive roller. Between the first cover and the second cover, a gap may be formed along an outer edge of the second cover as viewed from the third direction (in other words, a direction in which the rotation axis extends). The detachable dust cover may be configured to cover the second cover and the gap when the detachable dust cover is attached to the belt grinder. According to this aspect, the abrasive belt can be replaced through the gap between the first cover and the second cover in a state where the detachable dust cover is detached. In addition, since the second cover and the gap are covered with the detachable dust cover in a state where the detachable dust cover is attached, it is possible to suppress the escape of dust through the gap.

According to an aspect of the present invention, the first cover may include a protruding portion protruding to the opposite side of the abrasive belt. The cover main body may include a positioning portion that is adjacent to the protruding portion in the second direction and extends to a position partially overlapping the protruding portion in the third direction when viewed from the second direction when the detachable dust cover is attached to the belt grinder. According to this aspect, when the detachable dust cover is attached, the projecting portion of the first cover and the positioning portion of the detachable dust cover are aligned, whereby the first cover and the detachable dust cover can be easily aligned.

Drawings

Fig. 1 is a perspective view of a belt grinder according to an embodiment of the present invention.

Fig. 2 is a side view of the belt grinder.

Fig. 3 is a top view of the belt grinder, a portion of which is shown in section.

Fig. 4 is a perspective view of the removable dust cover.

Fig. 5 is a view showing a state in which the detachable dust cover is attached to the belt grinder.

Fig. 6 is a perspective view of the belt grinder with the detachable dust cover attached.

Fig. 7 is a side view of the belt grinder with the removable dust cover installed.

Fig. 8 is a top view of the belt grinder with the removable dust cover installed, showing a portion thereof in section.

Description of the reference numerals

10 … belt mill; 20 … a handle housing; 21 … controller case; 22 … motor housing; 23 … bracket; 25 … operating parts; 30 … battery mounting part; 35 … storage battery; 41 … arm; 42 … driven rollers; 43 … drive the rollers; 44 … abrasive belt; 45 … arm holders; a 46 … tensioner; 47 … compression spring; 48 … cam lever; 50 … electric motor; 51 … motor shaft; 52 … axis of rotation; 60 … flanges; 61 … long hole; 62 … lock lever; 70 … first cover; 71 … upper surface; 72 … lower surface; 73 … curved surface; 75 … dust collecting nozzle; a 76 … projection; 80 … second cover; 81 … bolt; 100 … removable dust cover; 110 … a mask body; 120 … a plate-like portion; 121 … recess; 130 … peripheral wall portions; 131. 132, 133 … cut-out portions; 134 … location portion; 140a … first retaining portion; 140b … second holding portion; 141a … lower surface; 141b … upper surface; 145a, 145b … slots; 150a … first elastic portion; 150b … second resilient portion.

Detailed Description

A schematic structure of a belt grinder 10 according to an embodiment of the present invention will be described with reference to the drawings. As shown in fig. 1 to 3, the belt grinder 10 includes a handle case 20, an arm 41, a driven roller 42, a drive roller 43 (see fig. 3), an abrasive belt 44, and an electric motor 50 (see fig. 3). The handle housing 20 has an elongated shape extending in a prescribed direction. The handle housing 20 is configured for being held by a user while using the belt grinder 10. The arm 41 has an elongated rod shape extending in a prescribed direction. In the state shown in fig. 1 to 3, the arm 41 extends in substantially the same direction as the direction in which the handle case 20 extends. In the present embodiment, the arm 41 is configured to be pivotable with respect to the handle housing 20 (details will be described later). In the following description, unless otherwise specified, the positional relationship and the orientation of the components of the belt grinder 10 will be described with the arm 41 being at the pivotal position shown in fig. 1 to 3.

As shown in fig. 3, the driving roller 43 is coupled to a motor shaft 51 of the electric motor 50. Therefore, the driving roller 43 is configured to be rotatable about the rotation axis 52 by the rotational driving force of the electric motor 50. The driven roller 42 is rotatably provided at the front end of the arm 41. An endless abrasive belt 44 is hung between the driven roller 42 and the driving roller 43. When the electric motor 50 is driven, the sanding belt 44 rotates in the direction of arrow a1 (see fig. 1 and 2) between the driven roller 42 and the driving roller 43.

In the following description, for convenience, in a state where the handle case 20 and the arm 41 are substantially aligned (i.e., the state shown in fig. 1 to 3), the side of the sanding belt 44 that advances from the drive roller 43 toward the driven roller 42 when the drive roller 43 rotates is defined as an upper side, and the side of the sanding belt 44 that advances from the driven roller 42 toward the drive roller 43 is defined as a lower side (see fig. 1 and 2). And, the direction in which the handle housing 20 extends is defined as the front-rear direction. The side of the electric motor 50 in the front-rear direction with respect to the handle case 20 is defined as a front side, and the opposite side of the electric motor 50 with respect to the handle case 20 is defined as a rear side (refer to fig. 3). And, a direction in which the rotation axis 52 extends is defined as a left-right direction. The side where the electric motor 50 is located in the left-right direction is defined as the left side, and the side where the driving roller 43 is located is defined as the right side (refer to fig. 3).

As shown in fig. 1 and 3, the controller case 21 is coupled to the rear end of the handle case 20. A controller (not shown) that controls power supply to the electric motor 50 is housed in the controller case 21. The battery mounting portion 30 is provided at the rear end of the controller case 21. The battery mounting portion 30 is configured to be slidably fitted with a battery 35 as a power source of the electric motor 50.

The trigger-type operation member 25 is provided on the front side and the lower side of the handle case 20. When the user performs a hooking operation on the operation member 25, a predetermined signal is transmitted from a switch box (not shown) housed in the handle case 20 to the controller. Upon receiving the signal, the controller supplies power from the battery 35 to the electric motor 50 to drive the electric motor 50. Thereby, the drive roller 43 is driven to rotate the abrasive belt 44 between the driven roller 42 and the drive roller 43.

As shown in fig. 3, the electric motor 50 is housed in the motor case 22. The motor housing 22 is located forward of the handle housing 20. The motor case 22 has a bottomed cylindrical shape with the left side closed. The right side of the motor housing 22 is closed by a bracket 23. The flange 60 is disposed on the right side surface of the bracket 23.

As shown in fig. 1 and 2, the flange 60 extends in a direction orthogonal to the rotation axis 52, and has a substantially fan-like shape when viewed from the left-right direction. The flange 60 is formed with an arc-shaped long hole 61 centered on the rotation axis 52. The long hole 61 penetrates the flange 60 in the left-right direction. A boss (not shown) projecting rightward from the bracket 23 penetrates the long hole 61, and a hexagonal bolt of the lock lever 62 is screwed into the boss. When the lock lever 62 is fastened, the flange 60 is pressed toward the bracket 23 side, and the positional relationship between the flange 60 and the bracket 23 is fixed. When the lock lever 62 is released, the flange 60 can pivot around the rotation axis 52 within an angular range in which the long hole 61 is formed.

As shown in fig. 1 to 3, the belt grinder 10 further includes a first cover 70. The first cover 70 is integrally formed with the flange 60. The first cover 70 extends from a radially inner portion of the flange 60 toward the front side. The arm holder 45 that holds the arm 41 in a manner to sandwich it in the left-right direction is disposed in the first cover 70. Therefore, when the flange 60 is pivoted, the first cover 70 integrally formed with the flange 60 is also pivoted integrally, and the arm 41 is also pivoted integrally.

As shown in fig. 1, the first cover 70 is closed at the upper side, lower side, left side, and rear side, and opened at the right side and front side. The first cover 70 includes an upper surface 71, a lower surface 72, and a curved surface 73. Upper surface 71 and lower surface 72 each have an elongated shape extending in the front-rear direction substantially parallel to sanding belt 44. The curved surface 73 extends rightward from the radially inner edge of the flange 60 and is formed in an arc shape along the edge. The curved surface 73 connects the upper surface 71 and the lower surface 72 in the vertical direction. First cover 70 surrounds drive roller 43 and a portion of abrasive belt 44 (more specifically, approximately half of abrasive belt 44 on the rear side) in a substantially U-shape by upper surface 71, lower surface 72, and curved surface 73. In general, the first cover 70 is also referred to as a pulley cover or the like. In the present embodiment, the length of the upper surface 71 in the front-rear direction is the same as the length of the lower surface 72 in the front-rear direction, and the lengths may be different from each other. For example, the front-rear direction length of the lower surface 72 may be smaller than the front-rear direction length of the upper surface 71.

As shown in fig. 1 to 3, the right side of the driving roller 43 is covered with a flat plate-like second cover 80 disposed substantially orthogonal to the rotation axis 52. The second cover 80 is attached to the first cover 70 by screwing the bolts 81 to bosses formed on the first cover 70. The second cover 80 has a shape following the inner edge of the first cover 70 when viewed from the left-right direction. A gap having a substantially U-shape when viewed from the left-right direction is formed between the first cover 70 and the second cover 80. Gaps are also formed above and below the arm holder 45 in the front-rear direction between the arm holder 45 located on the front side of the second cover 80 and extending in the front-rear direction and the first cover 70. The second cover 80 is provided to prevent clothes or the like of the user from being caught between the drive roller 43 and the abrasive belt 44, and the second cover 80 is also generally referred to as a safety cover or the like.

As shown in fig. 3, the tensioner 46 and the compression spring 47 are also housed in the first cover 70. The compression spring 47 urges the arm 41 to the front side by the tensioner 46. Thereby, the tension of the abrasive belt 44 is appropriately secured between the driven roller 42 and the driving roller 43.

In case abrasive belt 44 is worn, abrasive belt 44 may be replaced in the following manner. First, the user pivots the cam lever 48 disposed at the front end of the upper surface 71 in the counterclockwise direction. Thereby, a cam mechanism (not shown) interlocked with the cam lever 48 displaces the tensioner 46 to the rear side against the urging force of the compression spring 47. As a result, the tension of sanding belt 44 is relaxed, and sanding belt 44 can be removed from the gap between first cover 70 and second cover 80 and arm holder 45. Then, a new abrasive belt 44 is hung between the driven roller 42 and the driving roller 43 through the gap, and if the cam lever 48 is returned to the original position, the tension of the abrasive belt 44 is again appropriately secured.

As shown in fig. 1 and 2, a projection 76 is formed on the upper surface 71 of the first cover 70. Projection 76 is located near the front end of upper surface 71 and on the rear side of cam lever 48, and projects toward the upper side (in other words, the opposite side of sanding belt 44).

As shown in fig. 1 and 2, the first cover 70 is provided with a dust collection nozzle 75. The interior of the dust collection nozzle 75 communicates with the interior space of the first cover 70. A hose (not shown) connected to a dust collector (not shown) may be attached to the dust collection nozzle 75.

A detachable dust cover 100 (hereinafter, simply referred to as a dust cover 100) may be attached to the belt grinder 10. The dust cover 100 will be described below with reference to fig. 4 to 8. The direction in fig. 4 showing the dust cover 100 indicates the direction in a state where the dust cover 100 is attached to the belt grinder 10. As shown in fig. 4, the dust cover 100 includes a cover main body 110. The cover main body 110 includes a plate-like portion 120 and a peripheral wall portion 130.

As shown in fig. 4, in a state where the dust cover 100 is attached to the belt grinder 10 (hereinafter, simply referred to as an attached state), the plate-like portion 120 extends in the up-down direction and the front-rear direction. The plate-like portion 120 has a long strip shape with the front-rear direction being the longitudinal direction, and is formed slightly larger than the first cover 70 as viewed from the left-right direction. The rear end of the plate-like portion 120 has a shape following the curved surface 73 of the first cover 70. A recess 121 extending in a long circle shape with the front-rear direction as the longitudinal direction is formed near the rear end on the left side surface of the plate-like portion 120. The purpose of providing the recess 121 is to avoid interference between the plate-like portion 120 and the bolt 81 when the dust cover 100 is attached to cover the first cover 70 from the right side as indicated by an arrow a2 in fig. 5.

As shown in fig. 4, the peripheral wall portion 130 extends leftward from the outer edge portion of the plate-like portion 120 (in other words, in a direction orthogonal to the direction in which the plate-like portion 120 extends). The peripheral wall portion 130 is formed over the entire upper, rear, and lower sides of the outer edge portion of the plate-like portion 120, and is not formed on the front side. The peripheral wall portion 130 has cut-out portions 131, 132, 133 formed by cutting from the front end toward the base end of the peripheral wall portion 130 (in other words, the outer edge portion of the plate-like portion 120). The cutout portion 131 is provided for avoiding interference between the peripheral wall portion 130 and the dust collection nozzle 75 in the mounted state. Likewise, the cutout portion 132 is provided for avoiding interference of the peripheral wall portion 130 and the protruding portion 76 in the mounted state, and the cutout portion 133 is provided for avoiding interference of the peripheral wall portion 130 and the cam lever 48 in the mounted state.

As shown in fig. 4, the dust cover 100 further includes a first holding portion 140a and a second holding portion 140 b. The first holding portion 140a and the second holding portion 140b are portions that detachably hold a first elastic portion 150a and a second elastic portion 150b, which will be described later, respectively. The first holding portion 140a and the second holding portion 140b are separated in the vertical direction. In addition, the first holding portion 140a and the second holding portion 140b are located on the same side (specifically, on the left side) in the left-right direction with respect to the plate-shaped portion 120 as viewed from the up-down direction. More specifically, the first holding portion 140a is formed to protrude upward and leftward from the peripheral wall portion 130 located upward, and the second holding portion 140b is formed to protrude downward and leftward from the peripheral wall portion 130 located downward. In the present embodiment, the first holding portion 140a and the second holding portion 140b are integrally formed with the cover main body 110. In the present embodiment, the first holding portion 140a and the second holding portion 140b are disposed at the same position in the front-rear direction (substantially at the center in the front-rear direction in the present embodiment). As a result, the first holding portion 140a and the second holding portion 140b face each other in the vertical direction.

As shown in fig. 4, a groove 145a is formed in an inner portion (i.e., a lower portion) of the first holding portion 140 a. The groove 145a has a semicircular cross section. In the present embodiment, the groove 145a is a bottomed groove that is open on one side in the front-rear direction (i.e., the direction in which the groove 145a extends) and closed on the other side. More specifically, the groove 145a extends from the rear end of the first holding portion 140a toward the front side and terminates short of the front end of the first holding portion 140 a. Likewise, a groove 145b is formed in an inner portion (i.e., an upper portion) of the second holding portion 140 b. The groove 145b has the same shape and size as the groove 145 a.

The first elastic portion 150a is disposed in the groove 145a of the first holding portion 140a, and the second elastic portion 150b is disposed in the groove 145b of the second holding portion 140 b. In the present embodiment, the first elastic portion 150a and the second elastic portion 150b are rubber pins, respectively. The rubber pin is a cylindrical member made of rubber, and is a general-purpose member generally used for electric power tools. The first elastic portion 150a and the second elastic portion 150b are held in the grooves 145a and 145b in a partially fitted state, respectively. In other words, the first elastic portion 150a is held in a state in which a part of the circumferential direction is fitted into the groove 145a and the remaining part is exposed. Similarly, the second elastic portion 150b is held in a state in which a part of the circumferential direction is fitted into the groove 145b and the remaining part is exposed. More specifically, the first elastic portion 150a is disposed to partially protrude from the lower surface 141a of the first holding portion 140a when viewed from the front-rear direction. Similarly, the second elastic portion 150b is disposed to partially protrude from the upper surface 141b of the first elastic portion 150a when viewed from the front-rear direction. The grooves 145a and 145b can hold the rubber pin with a simple structure.

The first elastic portion 150a and the second elastic portion 150b are also separated in the vertical direction by the positions of the first holding portion 140a and the second holding portion 140b that hold the first elastic portion 150a and the second elastic portion 150b, and are located on the same side (specifically, on the left side) with respect to the plate-like portion 120 in the horizontal direction when viewed in the vertical direction. In addition, the first elastic portion 150a and the second elastic portion 150b are disposed at the same position in the front-rear direction. Since the grooves 145a and 145b are bottomed grooves, if the first elastic portion 150a and the second elastic portion 150b are arranged such that the first elastic portion 150a and the second elastic portion 150b respectively abut against the bottoms of the grooves (see fig. 4), the first elastic portion 150a and the second elastic portion 150b can be easily arranged at the same position in the front-rear direction.

The first elastic portion 150a thus arranged can be elastically deformed toward the upper side (in other words, the direction from the second elastic portion 150b toward the first elastic portion 150 a). Similarly, the second elastic portion 150b is elastically deformable toward the lower side (in other words, a direction from the first elastic portion 150a toward the second elastic portion 150 b).

As shown in fig. 4, the dust cover 100 further includes a positioning portion 134. The positioning portion 134 extends leftward from the peripheral wall portion 130 on the upper side. In the present embodiment, the positioning portion 134 is located on the front side of the first holding portion 140a and is continuous in the front-rear direction with respect to the first holding portion 140 a.

As shown by an arrow a2 in fig. 5, the dust cover 100 can be attached to the first cover 70 of the belt grinder 10 in such an orientation that the first holding portion 140a projects upward and leftward and the second holding portion 140b projects downward and leftward. Specifically, as shown in fig. 6 to 8, the dust cover 100 is disposed such that the peripheral wall portion 130 of the detachable dust cover 100 surrounds the outer edge portion on the right side of the first cover 70. At this time, the first elastic portion 150a held by the first holding portion 140a abuts against the flat portion of the upper surface 71 of the first cover 70, and the second elastic portion 150b held by the second holding portion 140b abuts against the flat portion of the lower surface 72 of the first cover 70. In other words, the dust cover 100 is disposed so that the first cover 70 is sandwiched between the first elastic portion 150a and the second elastic portion 150b in the vertical direction. At this time, the portion protruding from the groove 145a is pressed by the upper surface 71, and the first elastic portion 150a is elastically deformed upward. Thereby, the restoring force of the first elastic portion 150a acts on the upper surface 71 toward the lower side. Further, the portion protruding from the groove 145b is pressed by the lower surface 72, and the second elastic portion 150b is elastically deformed toward the lower side. Thereby, the restoring force of the second elastic portion 150b acts on the lower surface 72 toward the upper side. That is, the restoring force of the first elastic portion 150a and the second elastic portion 150b acts so as to sandwich the first cover 70 from above and below, thereby maintaining the positional relationship between the first cover 70 and the dust cover 100. When the thus assembled dust cover 100 is pulled in the opposite direction to that in the mounting (i.e., the opposite direction of arrow a2 shown in fig. 5), the dust cover 100 can be detached.

When the dust cover 100 is attached in this way, the positioning portion 134 of the dust cover 100 can easily align the dust cover 100 and the first cover 70. Specifically, as shown in fig. 6, in the attached state, the positioning portion 134 is disposed at a position adjacent to the protruding portion 76 of the first cover 70 in the front-rear direction. In the attached state, the positioning portion 134 extends leftward as viewed from the front-rear direction to a position partially overlapping the protruding portion 76. Therefore, if the dust cover 100 is positioned with respect to the first cover 70 such that the front end of the positioning portion 134 contacts the rear end of the protruding portion 76, the dust cover 100 is automatically mounted in position on the first cover 70.

According to the dust cover 100, in the attached state to the first cover 70, the plate-like portion 120 can cover the gap between the first cover 70 and the second cover 80 and the gap between the first cover 70 and the arm holder 45, and therefore, it is possible to effectively guide the dust to the dust collection nozzle 75 while suppressing the dust from escaping from the inside of the first cover 70 to the outside. When it is necessary to replace sanding belt 44, sanding belt 44 can be replaced as in the conventional art by simply removing dust cover 100 through the gap between first cover 70 and second cover 80 and the gap between first cover 70 and arm holder 45. Dust cover 100 can be easily removed without using tools, and therefore, workability in replacing sanding belt 44 is not deteriorated.

Further, according to the dust cover 100, the peripheral wall portion 130 extending substantially in parallel with the upper surface 71, the lower surface 72, and the curved surface 73 of the first cover 70 covers the outer edge portion on the right side of the first cover 70 from the outside, and therefore, dust escape can be further suppressed.

Further, according to the dust cover 100, the first elastic portion 150a and the second elastic portion 150b are disposed at the same position in the front-rear direction, and therefore, in the attached state, the first cover 70 can be pressed in the opposite direction at the same position in the front-rear direction by the restoring force of the elastic deformation of the first elastic portion 150a and the second elastic portion 150 b. Therefore, the restoring force does not act in the direction of rotating the cover main body 110 of the dust cover 100, and as a result, the positional relationship between the cover main body 110 and the first cover 70 can be stably maintained. Even if an error occurs in the dimensional relationship between the cover main body 110 and the first cover 70, the error can be absorbed by the elastic deformation of the first elastic portion 150a and the second elastic portion 150 b. Therefore, the dimensional accuracy required for the cover main body 110 and the first cover 70 can be reduced.

Further, according to the dust cover 100, since the first elastic portion 150a and the second elastic portion 150b are detachably held by the first holding portion 140a and the second holding portion 140b, respectively, when the first elastic portion 150a and the second elastic portion 150b are deteriorated or damaged, the dust cover 100 can be continuously used by merely replacing the first elastic portion 150a and the second elastic portion 150 b. That is, the dust cover 100 need not be replaced in its entirety. Therefore, the convenience of the user is improved. Further, since the first elastic portion 150a and the second elastic portion 150b are rubber pins, they can be easily obtained.

The embodiments of the present invention have been described above, but the above embodiments are for easy understanding of the present invention, and do not limit the present invention. The present invention can be modified and improved without departing from the gist thereof, and the present invention includes equivalents thereof. In addition, the elements described in the claims and the description of the present invention may be arbitrarily combined or omitted within a range in which at least a part of the above-described problems can be solved or within a range in which at least a part of the effects can be achieved.

For example, any elastic member may be used as the first elastic portion 150a and the second elastic portion 150b instead of the rubber pins. The first elastic portion 150a and the second elastic portion 150b may be, for example, resin springs, leaf springs, or the like.

The first elastic portion 150a and the second elastic portion 150b may be disposed at different positions in the front-rear direction. The first elastic portion 150a and the second elastic portion 150b may be set at any position according to the position of the flat portion of the first cover 70 as long as the first cover 70 is sandwiched in the vertical direction.

Instead of the first elastic portion 150a and the second elastic portion 150b, the dust cover 100 may include an elastic portion that is not detachable (i.e., an elastic portion integrated with the cover main body 110). For example, the dust cover 100 may include a pair of flexible arms that can be flexed in the vertical direction in the attached state. In this case, the dust cover 100 is fixed to the first cover 70 with the first cover 70 sandwiched from above and below in a state where the pair of flexible arms are flexed in a direction separating from each other.

The number of at least one of the first elastic portion 150a and the second elastic portion 150b is not limited to 1, and may be any number of 2 or more.

Also, the peripheral wall portion 130 may be omitted.

The belt grinder 10 may not include the dust collection nozzle 75. Even in this case, the dust cover 100 can prevent dust from escaping to the user side of the grip handle case 20.

Instead of the battery 35, the belt grinder 10 may be provided with a power cord for connection to an AC power source. Alternatively, an air motor that drives the driving roller 43 using compressed air supplied from the outside as a driving source may be used instead of the electric motor 50.

Claims (13)

1. A detachable dust cover for a belt grinder, comprising a cover main body having a plate-like portion extending in a first direction and a second direction orthogonal to the first direction,

the detachable dust cover includes:

a first elastic part having elasticity; and

a second elastic part with elasticity,

the first elastic part and the second elastic part are separated from each other in the first direction,

the first elastic portion and the second elastic portion are located on the same side with respect to the plate-like portion in a third direction orthogonal to the first direction and the second direction when viewed from the first direction,

the first elastic portion is elastically deformable in a direction from the second elastic portion toward the first elastic portion in the first direction,

the second elastic portion is elastically deformable in a direction from the first elastic portion toward the second elastic portion in the first direction.

2. The removable dust cap of claim 1,

the first elastic part and the second elastic part are arranged at the same position in the second direction.

3. The removable dust cover according to claim 1 or 2,

the detachable dust cover includes:

a first holding portion that holds the first elastic portion detachably; and

and a second holding portion that detachably holds the second elastic portion.

4. The removable dust cap of claim 3,

the first elastic part and the second elastic part are respectively rubber pins.

5. The removable dust cap of claim 4,

the first holding portion and the second holding portion each have a groove for holding the rubber pin in a partially fitted state.

6. The removable dust cap of claim 5,

one side of the groove in the extending direction of the groove is closed, and the other side is open.

7. The removable dust cover according to claim 1 or 2,

the cover main body is provided with a peripheral wall portion extending in the third direction from an outer edge portion of the plate-like portion,

the peripheral wall portion is located on the same side as the first elastic portion and the second elastic portion with respect to the plate-like portion in the third direction.

8. A detachable dust cover for a belt grinder, comprising a cover body,

the detachable dust cover includes:

a first elastic part having elasticity; and

a second elastic part with elasticity,

the detachable dust cover is configured to: when the cover main body is disposed so that the first elastic portion and the second elastic portion sandwich a part of the belt grinder, the first elastic portion and the second elastic portion are pressed and elastically deformed by the part of the belt grinder, and a positional relationship between the cover main body and the part of the belt grinder is maintained by a restoring force of the elastic deformation.

9. A belt grinder is provided with:

a motor;

a drive roller configured to rotate around a rotation axis by a driving force of the motor;

an arm;

a driven roller provided at a front end of the arm;

an annular abrasive belt hung between the driving roller and the driven roller; and

a first cover enclosing the drive roller and a part of the sanding belt in a U-shape in the direction of rotation of the sanding belt,

it is characterized in that the preparation method is characterized in that,

the belt grinder is further provided with the detachable dust cover of claim 1 or 2,

the removable dust cover is configured to: when the belt grinder is assembled, the direction in which the arm extends is the second direction, the direction in which the rotation axis extends is the third direction, and the first cover is sandwiched between the first elastic portion and the second elastic portion.

10. The belt grinder of claim 9,

the belt grinder is provided with a second cover which is arranged to be orthogonal to the rotation axis and covers the drive roller,

a gap is formed between the first cap and the second cap along an outer edge of the second cap when viewed from the third direction,

the removable dust cover is configured to: covering the second cover and the gap when assembled to the belt grinder.

11. The belt grinder of claim 9,

the first cover is provided with protrusions protruding towards the opposite side of the sanding belt,

the cover main body includes a positioning portion that is adjacent to the protruding portion in the second direction when the detachable dust cover is attached to the belt grinder, and that extends to a position partially overlapping the protruding portion in the third direction when viewed from the second direction.

12. A belt grinder is provided with:

a motor;

a drive roller configured to rotate around a rotation axis by a driving force of the motor;

an arm;

a driven roller provided at a front end of the arm;

an annular abrasive belt hung between the driving roller and the driven roller; and

a first cover enclosing the drive roller and a part of the sanding belt in a U-shape in the direction of rotation of the sanding belt,

it is characterized in that the preparation method is characterized in that,

the belt grinder is further provided with the removable dust cover of claim 8,

the portion of the belt grinder is the first hood.

13. The belt grinder of claim 12,

the belt grinder is provided with a second cover which is arranged to be orthogonal to the rotation axis and covers the drive roller,

a gap is formed between the first cover and the second cover along an outer edge of the second cover as viewed from a direction in which the rotation axis extends,

the removable dust cover is configured to: covering the second cover and the gap when assembled to the belt grinder.

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