JP2005040939A - Filter unit and dust collector provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust collector which can effectively capture abrasive powder and chips generated by working so as to surely make the inside of a bag-like filter unit full of the abrasive powder and chips. <P>SOLUTION: The filter unit is provided with the filter unit 4, a dust collecting pipe 3 inserted to the inlet opening 6 of the filter unit 4 and extended over the inside and outside of a filter body 4a, a suction machine 8 for sucking air from the lower side of the filter body 4a, and a hanger 7 for locking the filter. The filter unit 4 has an inlet part 4b in which the inlet opening 6 is provided on the upper part of the vertically extended bag-like filter body 4a. The inlet part 4b has an inlet holding member 23 which is fixed to the filter body 4a and holds the inlet opening 6 in the opening direction. A locking part 23c, which is locked to the hanger 7 so as to be capable of freely locking/unlocking and makes the filter unit 4 to be held in a suspended state, is formed with the inlet holding member 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a filter unit that collects abrasive powder generated when polishing or cutting work of a relatively small workpiece, cutting waste, etc., in a filter so as not to be scattered, a dust collector equipped with the filter unit, and a work table. Is.

  For example, a dental technician grinds or cuts a workpiece such as a denture with a tool such as an air grinder (handpiece). During this work, polishing powder, cutting waste, etc. (hereinafter referred to as dust) are generated. In order to perform the work while preventing such dust scattering, conventionally, as shown in FIG. 12 (a), a dust suction pipe 52 having a dust suction port 51 is provided on the rear side of the work plate 50 of the work table. The discharge port 55 of the pipe 52 is led to the internal space 54 of the drawer portion 53 below the work plate 50, and the inlet portion of the flat flat rectangular bag-shaped filter 57 shown in FIG. 56, and the front part of the internal space 54 in FIG. 12 (a) is connected to the injection pump 58. The filter 57 is formed in a bag shape by fusing a mesh-like filter medium that allows air to pass through and traps only dust inside the side portions 59 and 60 in the width direction W. It is a disposable type that is removed and discarded when the inside becomes full.

On the other hand, the present applicant has previously proposed a front open type work box that is particularly suitable for polishing or cutting a workpiece such as a denture (see Patent Document 1). This front open work box is configured to blow dust generated in the work space during work from the air nozzle to the rear of the work space and discharge it to the outside through the air exhaust port. Can be reliably prevented and discharged efficiently.
JP 2003-126118 A

  However, the conventional bag-like filter 57 shown in FIG. 12 is attached in such a manner that the inlet portion 56 is connected to the outlet 55 of the dust suction pipe 52 in a horizontally placed horizontal state in the drawer portion 53 of the desk. Dust introduced from the inlet portion 56 of the filter 57 is diffused toward the entire inner surface of the horizontally placed filter 57, and when a small amount of dust adheres to the entire inner surface, clogging occurs quickly. appear. The dust suction pipe 52 that forms a path of dust-containing air is bent in a curved shape from the rear of the upper surface of the work plate 50 and changed in the direction toward the front of the desk, and is then introduced into the drawer of the desk. Therefore, since the air in the dust suction pipe 52 flows so as to change direction in the direction opposite to the direction of introduction from the dust suction port 51, large dust tends to stay in the direction change location inside the dust suction pipe 52. There are also drawbacks.

  On the other hand, the front open work box can effectively collect and discharge the dust generated during the polishing work and the cutting work without being scattered as described above. In order to use it effectively, a dust collector for effectively capturing the discharged dust is required.

  The present invention has been made in view of the above-described conventional problems, and effectively captures dust such as abrasive powder and cutting waste generated by work so that the inside of the bag-shaped filter body is completely filled. An object of the present invention is to provide a filter unit that can be used, a dust collector equipped with the filter unit, and a work table.

  In order to achieve the above object, a filter unit according to the present invention includes a bag-like filter body extending in the vertical direction, and a dust absorption unit provided on the upper part of the filter body for sucking air into the inner space of the bag. And an inlet portion provided with an inlet opening for inserting a pipe. The inlet portion has an inlet holding member that is fixed to the filter main body and holds the inlet opening in a direction to open the opening, and the inlet holding member has a locking portion for holding the filter main body in a suspended state. Is formed.

  According to this filter unit, since the filter main body is held in a suspended state by the engaging portion provided on the inlet holding member of the bag-shaped filter main body, the dust introduced into the filter main body from the inlet portion However, since it naturally falls toward the bottom of the suspended filter main body due to its own weight, the dust introduced into the filter main body is sent to the bottom of the filter main body and sequentially accumulated upward from the bottom. Therefore, there is no possibility of clogging in the portion of the filter body above the portion where dust is accumulated, and dust can be reliably collected until the filter body is full.

  In addition, an inlet holding member that holds the inlet opening in the opening direction is provided at the inlet portion of the filter body, and a locking portion for holding the filter body in a suspended state is formed on the inlet holding member. Therefore, by deforming the inlet holding member, the locking portion of the inlet holding member can be easily engaged and disengaged from, for example, the filter locking hanger of the support base. There is an advantage that can be.

  In the filter unit according to a preferred embodiment of the present invention, the inlet portion is further inserted between the inlet holding member and the filter main body, and the outer peripheral surface of the dust suction pipe inserted and the inlet opening. It has the sealing member which seals between. According to this configuration, when the filter body is suspended in a state where the dust suction pipe is inserted into the inlet opening of the filter body, the gap between the inlet opening of the filter body and the outer peripheral surface of the dust suction pipe is sealed without a gap. Therefore, the dust sent through the dust suction pipe is surely introduced into the inside of the filter body without scattering from the entrance opening of the filter body.

  In the filter unit according to another preferred embodiment of the present invention, a gripping portion to be grasped by a hand is formed on both the left and right sides of the front portion of the inlet holding member. According to this configuration, the filter unit can be handled while holding the pair of gripping portions on the left and right sides of the front portion of the inlet holding member with the hand, so that the filter unit can be handled easily.

  A dust collector according to the present invention includes a filter unit having the above-described configuration, a dust suction pipe that is inserted into the inlet opening of the filter unit and extends inside and outside the filter body, and a suction device that sucks air from below the filter body. I have.

  According to this configuration, the dust introduced into the filter body from the inlet part naturally falls due to its own weight, and the air is forcibly sucked downward by the drive of the suction device. It is reliably sent toward the bottom of the main body and deposited on the bottom. In addition, since the dust suction pipe is inserted into the filter body through the inlet opening, it is possible to maintain a large flow rate of the introduced air up to the discharge port of the dust suction pipe with a narrow passage area. The flow rate of air inside the filter body can be increased by the insertion length of the pipe inside the filter body. Moreover, when dust accumulates on the bottom of the filter body and becomes heavy, the upper inlet part tends to close, but since the dust suction pipe is inserted into this inlet part, the inlet part is prevented from closing, Is smoothly introduced into the filter body.

  In the dust collector according to a preferred embodiment of the present invention, slits extending in the axial direction of the pipe are formed on both side portions of the dust suction pipe facing the filter body in the width direction. According to this configuration, even if the upper surface of the dust that accumulates sequentially from the bottom inside the filter body reaches the discharge port of the dust suction pipe and the dust is blocked by the dust, the air in the dust suction pipe passes through the slit. It blows out toward the both side parts which oppose the width direction inside a filter main body. Thereby, it is possible to reliably collect dust until the filter body is full of dust.

  A dust collector according to another preferred embodiment of the present invention includes a filter locking hanger on which a locking part of the filter unit is detachably locked. According to this configuration, the locking portion of the filter unit can be easily and quickly attached and detached by a simple operation that is detachably locked to the filter locking hanger.

  In the dust collector according to this embodiment, a pair of the front and rear locking portions are provided, and the filter locking hanger has a front and rear hook in which the locking portion is locked at the lower end by the restoring force of the inlet holding member. And a pair of front and rear first and second swing plates rotatably supported by the body. The first swing plate receives an operating force in the operating direction from the first swing plate. Is provided with an operating portion that disengages the front locking portion from the front hook portion, and the second swing plate receives rotational force by the rotation of the first swing plate in the operating direction. It is preferable that an interlocking portion for separating the rear locking portion from the rear hook portion is provided.

  According to this configuration, when removing the filter unit filled with dust from the filter-hanging hanger, the first swing plate on the front side is rotated by applying an operating force in the operating direction, for example, by a pressing operation. With this rotation, the operating portion of the first swing plate disengages the front locking portion of the filter unit from the front hook portion of the filter locking hanger body, and the second swing plate on the rear side When the first swing plate rotates in the operating direction, the first swing plate rotates by receiving the rotational force, and along with this rotation, the interlocking portion of the second swing plate locks the locking portion on the rear side of the filter unit. Remove from the hook on the rear side of the hanger body. Therefore, the filter unit can be easily removed from the dust collector by performing a simple one-touch operation that only applies operating force to the first swing plate on the front side. The troublesome work of removing the latching part from the hanger is eliminated.

  Further, it is preferable that the rear side locking portion is released by the second swing plate at the same time or earlier than the front side locking portion is released by the first swing plate. According to this configuration, there is no possibility that the rear locking portion will be caught by the rear hook portion after the front locking portion is detached from the front hook portion, so that the rear locking portion does not come off. There is no need to perform troublesome work such as removing the rear locking portion from the rear hook portion that has been caught and caught by the rear side which is difficult to insert.

  The worktable according to the present invention includes a work plate, an introduction passage for introducing air on the work plate, and a dust collector having the above-described configuration, and a dust suction pipe of the dust collector is connected to an outlet of the introduction passage.

  According to this configuration, the dust collecting pipe of the dust collector is connected to the outlet of the introduction passage, so that the inside of the filter body communicates with the introduction passage, so that it occurs on the work plate on which polishing work or cutting work is performed. The dust can be efficiently introduced into the filter main body without being scattered around.

  ADVANTAGE OF THE INVENTION According to this invention, dusts, such as grinding | polishing powder and cutting waste, can be effectively capture | acquired so that the inside of a bag-shaped filter main body may be reliably filled.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cut side view showing a work table with a dust collector according to a first embodiment of the present invention. The work table 100 includes a work plate 1 for performing polishing work and cutting work thereon, a substantially L-shaped air introduction pipe (introduction passage) 2 for introducing air A on the work plate 1, A dust suction pipe 3 connected to the outlet of the air introduction pipe 2, a filter unit 4 in which the dust suction pipe 3 is inserted from the inlet opening and held in a suspended state, and the filter unit 4 Is provided with a filter-hanging hanger 7 having a pair of front and rear hook portions 70, 70 on which the air is locked, and a suction device 8 for sucking air A from below the filter unit 4. The work plate 1, the dust suction pipe 3, and the filter locking hook 7 are integrally formed with the frame F.

  On the work plate 1, for example, a front open type work box 9 described in Patent Document 1 described above is installed. At this time, a box discharge port 9 a protruding from the rear portion (left side in FIG. 1) of the work box 9 is connected to the inlet 2 a of the air introduction pipe 2. The front open type work box 9 is opened at the front (right side in FIG. 1), and the operator inserts both hands from both sides (front and back sides in FIG. 1) to perform polishing work and cutting work. , Dust generated by the work is introduced into the air introduction pipe 2 from the box discharge port 9a.

  The work plate 1 is a flat box, and a drawer 5 is accommodated therein so that it can be put in and out. The frame F is formed with a filter storage chamber 11 in which the filter unit 4 is detachably attached in a suspended state, and an opening / closing door 12 is attached to the rear surface of the filter storage chamber 11. Inside the filter storage chamber 11 is provided a filter support plate 13 that supports the lower end portion of the filter unit 4 attached in a suspended state so as to support it. The suction machine 8 includes a suction fan 14 and a motor 17 that drives the suction fan 14, and is supported by a lower portion of the frame F. An air suction passage 18 that communicates with the filter storage chamber 11 and sucks the air A in the filter storage chamber 11 is provided above the suction fan 14. An air discharge passage 19 is provided for discharging the air A sucked by the outside. The dust suction pipe 3, the filter unit 4, the filter storage chamber 11, the air suction passage 18 and the suction machine 8 constitute a dust collector 10.

  Further, at the lower part of the frame F, there are a cooling air inlet 20 for sucking the cooling air A1 into the motor 17 and an air outlet 21 for discharging the cooled air A1 to the air discharge passage 19. Is provided. The work table 100 is movable by a plurality of casters 22 provided at the lower part of the frame F.

  Next, the filter unit 4 will be described. As shown in FIG. 7, the filter main body 4a of the filter unit 4 is formed by any of sewing, welding, or bonding of the entire periphery of the resin filter medium, that is, the upper end 41, both sides 42, and the lower end 43. It is sealed by such joining means, and has a rectangular outer shape when viewed from the front-rear direction T, and is formed in a flat bag shape with a small thickness in the front-rear direction T. Although not shown in the drawing, the filter body 4a is configured by superimposing a plurality of types of filter media including a coarse mesh filter media disposed on the inside and a filter media such as a fine mesh nonwoven fabric disposed on the outside. ing. In the upper end portion 41 that is one end portion in the length direction (vertical direction) L of the filter body 4a, an inlet portion 4b into which the dust suction pipe 3 extends so as to extend inside and outside the filter body 4a is provided in the width direction W, that is, left and right It is provided at the center of the direction. Next, the configuration of the inlet 4b will be described.

  As shown in FIG. 3, the inlet portion 4b of the filter unit 4 includes an inlet holding member 23 made of an elastic material, for example, polypropylene (PP), and a filter body 4a through a seal member 24 made of rubber sponge. It is configured to be fixed by a connecting means such as bonding with rivets or double-sided tape. The filter body 4a, the seal member 24, and the inlet holding member 23 are formed with insertion holes 4c, 24a, and 23b through which the dust suction pipe 3 is inserted, respectively. These insertion holes 4 c, 24 a, 23 b are superposed on each other to form the inlet opening 6 of the filter unit 4.

  As shown in FIG. 4, the inlet holding member 23 has a rectangular outer shape when viewed from the front, and is bent toward the filter body 4a along a fold line 23a formed corresponding to the width direction W of the filter body 4a. In the state, the peripheral edge is joined to the filter body 4a. Therefore, the inlet holding member 23 formed of a material having elasticity holds the filter body 4a in the direction of opening the inlet opening 6 by its own restoring force. Locking pieces 23c protruding from both ends of the inlet holding member 23 that are parallel to the fold line 23a, that is, both ends in the thickness direction of the filter body 4a, are not fixed to the filter body 4a. 1 and separated from the filter hanger 7 shown in FIG.

  The insertion hole 23b formed at the center of the folding line 23a of the inlet holding member 23 in FIG. 4 is formed in a circular hole shape having a diameter slightly larger than the outer diameter of the dust suction pipe 3, and the inlet holding member 23 is slightly bent. Further, the dimensions are set such that the dust suction pipe 3 can be inserted in the state shown in FIG. The insertion hole 4c of the filter body 4a is formed in a circular shape having the same diameter as the insertion hole 23b of the inlet holding member 23 shown in FIG. 4, but the insertion hole 24a of the seal member 24 is formed in the insertion holes 4a and 23b. On the other hand, it is formed in a circular hole shape having a slightly small diameter. Thereby, when the dust suction pipe 3 is inserted into the inlet opening 6 of the filter unit 4, the hole edge portion of the insertion hole 24 a of the seal member 24 comes into contact with the outer peripheral surface of the dust suction pipe 3, and the outer periphery of the dust suction pipe 3. The gap between the surface and the inlet opening 6 is sealed without any gap.

  As shown in FIG. 2, the dust-absorbing pipe 3 has an elliptic discharge port 3a formed by cutting the tip 31a of the filter inner portion 31 located in the filter body 4a in an oblique direction with respect to the pipe axis. Has been. This cut surface is inclined downward from the front to the rear. Here, for the dust collector 10 including the filter unit 4 and the dust suction pipe 3, the direction viewed from the opening / closing door 12 is the front-rear direction. Accordingly, in FIGS. 2 and 3, the left side is the front side, which is opposite to the front-rear direction of the entire work table 100 of FIG. Along the pipe axial direction from the discharge port 3a to both side portions of the filter inner portion 31 facing the width direction W of the filter unit 4 in the state of being locked to the hanger 7, that is, both side portions in the left-right direction. A pair of slits 3b extending upward is formed. The tip (upper end) of the filter outer portion 32 of the dust suction pipe 3 is cut in a direction perpendicular to the pipe axis.

  Next, handling and operation of the work table 100 with a dust collector will be described. As shown in FIG. 7, the disposable filter unit 4 used for the work table 100 is formed by forcibly folding the inlet holding member 23 having elasticity into two in the sales and distribution process and before use. Since it can be handled in a flat state by stacking in the left-right direction in FIG. 7 to reduce the bulk, management and handling become easy. In addition, when the filter unit 4 is manufactured, the inlet holding member 23 is held in a folded state so that the peripheral portions 41 to 43 of the filter body 4a can be welded. On the other hand, the filter 57 used in the conventional dust collecting operation shown in FIG. 12 (b) for comparison has a relatively large inlet portion 56 that cannot be bent. growing.

  When performing a polishing operation or a cutting operation, the door 12 shown in FIG. 1 is opened, and the filter unit 4 is engaged with the pair of hook portions 70, 70 of the filter engagement hanger 7 fixed to the frame F. And attach to the suspended state. At that time, the inlet holding member 23 is inserted into the inlet opening 6 including the insertion holes 4c, 24a, 23b of the filter unit 4 of FIG. 3 while the dust suction pipe 3 fixed to the frame F is inserted into the pair of hook portions 70, 2, the outer surface of the inlet holding member 23 shown in FIG. 2 is bent in a direction to be folded in two while contacting the tips of the pair of hook portions 70, 70. As shown in FIG. 5 (a), when the leading ends of the locking pieces 23c, 23c on both sides of the top 23 reach above the leading ends of the hook portions 70, 70, the inlet holding member 23 is indicated by an arrow by a restoring force. And the filter unit 4 is slightly lowered, and as shown in FIG. 5B, both the locking pieces 23c and 23c are automatically locked to the hook portions 70 and 70, and the filter unit 4 Is a filter It is attached to the locking hanger 7. Therefore, the filter unit 4 can be detachably attached to the work table 100 by a one-touch operation.

  Further, when the filter unit 4 is attached, the tip 31a of the dust suction pipe 3 is cut obliquely and has a sharp shape. Therefore, the tip 31a serves as a guide to absorb dust in the inlet opening 6 of the filter unit 4. The pipe 3 can be easily inserted. In particular, the tip 31 a of the dust suction pipe 3 smoothly passes through the seal member 24 while expanding the seal insertion hole 24 a slightly smaller in diameter than the outer diameter of the dust suction pipe 3. When the filter unit 4 is locked to the filter locking hanger 7, the hole edge of the seal insertion hole 24 a is deformed by its own elastic force, so that the outer peripheral surface of the dust suction pipe 3 in FIG. The gap between the outer peripheral surface of the dust suction pipe 3 and the inlet opening 6 of the filter unit 4 is sealed. Therefore, the dust sent through the dust suction pipe 3 during work is reliably introduced into the filter unit 4 without being scattered into the filter storage chamber 11.

  After the filter unit 4 is locked to the filter locking hanger 7 as described above, the opening / closing lid 12 of FIG. 1 is closed and the suction machine 8 is driven. In this state, the worker uses the front open type work box 9 to perform polishing work or cutting work. The dust generated by this work is introduced into the air introduction pipe 2 from the exhaust port 9a of the work box 9 together with the air A by the air suction force generated by the suction machine 8, and then discharged from the dust suction pipe 3 of FIG. It is introduced into the filter unit 4 from the outlet 3a and the slit 3b. The dust introduced into the filter unit 4 is captured inside the filter body 4a, and only the air A is discharged to the outside through the air suction passage 18, the suction device 8, and the air discharge passage 19 of FIG. In FIG. 1, the filter body 4 a swelled during suction is indicated by a two-dot chain line.

  During the operation, the dust introduced into the filter body 4a naturally falls toward the bottom of the suspended filter body 4a due to its own weight, and is also directed downward of the filter body 4a by driving the suction device 8. Since the air A is forcibly sucked, the dust 27 in the filter main body 4a is surely sent toward the bottom of the filter main body 4a, and sequentially accumulates upward from the bottom. Therefore, portions other than the portion where the dust is accumulated in the filter main body 4a are not clogged, so that the dust collecting operation can be continued efficiently while the filter function of the filter main body 4a is reliably maintained. In particular, dental dust, unlike domestic waste, contains a heavy substance such as metal, and thus is smoothly deposited on the bottom of the filter body 4a by its own weight.

  Further, by inserting the dust suction pipe 3 into the inlet opening 6 of the filter unit 4 and locking the locking piece 23c of the inlet holding member 23 in the filter unit 4 to the filter locking hanger 7, Since the inside can be communicated with the air introduction pipe 2, the dust 27 generated on the work plate 1 on which polishing work or cutting work is performed can be efficiently introduced into the filter body 4 a without being scattered around. Can do. Further, when dust 27 accumulates at the bottom of the filter body 4a and becomes heavy, the upper inlet portion 4b tends to close, but the inlet portion 4b is closed because the dust suction pipe 3 is inserted into the inlet portion 4b. This is prevented by the dust suction pipe 3, and the dust 27 is smoothly introduced into the filter body 4a.

  Further, since the dust suction pipe 3 is inserted into the filter unit 4 through the inlet opening 6, a large flow rate of the introduced air A can be maintained up to the discharge port 3 a of the dust suction pipe 3 having a narrow passage area. Compared with the case where it is not used, the flow rate of the air A inside the filter body 4a can be increased by the insertion length inside the filter unit 4 in the dust suction pipe 3, that is, the length of the pipe inner portion 31. As a result, the dust 27 introduced into the filter body 4a can be more reliably dropped toward the bottom of the filter body 4a, and clogging of the filter body 4a can be more effectively prevented. In other words, even when a suction device having a small capacity is used, the filter body 4a can be prevented from being clogged and the dust collecting operation can be performed efficiently.

  Further, the filter unit 4 is increased in load in the opening direction with respect to the inlet holding member 23 as the weight of the filter unit 4 increases due to the dust 27 accumulated therein, There is no possibility that the locking between the locking piece 23c and the hook portion 70 of the hanger 7 is released. Therefore, both the locking piece 23c and the hook part 70 can be made into a small shape, and this makes it easy to attach / detach the filter unit 4 to / from the hanger 7.

  Then, as indicated by a two-dot chain line in FIG. 6, the upper surface 27 a of the dust 27 that sequentially accumulates from the bottom inside the filter body 4 a reaches the discharge port 3 a of the dust suction pipe 3, and the discharge port 3 a is blocked by the dust 27. In this case, the air A fed through the dust suction pipe 3 passes through the pair of slits 3b and is blown out in the left and right sides facing the width direction W inside the filter body 4a, that is, the air A inside the filter body 4a. It is blown out toward the place where there is little resistance. This ensures that the dust collecting action is continued until the dust 27 is filled in the filter unit 4. When the dust 27 is filled inside the filter unit 4, the door 12 shown in FIG. 1 is opened, and the inlet holding member 23 is lifted slightly upward while being deformed in the closing direction P shown in FIG. 5 (a). Thus, the filter unit 4 can be removed from the hook portion 70 by moving the filter unit 4 downward when the tips of the pair of locking pieces 23c of the inlet holding member 23 are separated from the tips of the hook portion 70. . That is, the filter unit 4 can be removed by a one-touch operation.

  In the first embodiment, the case where the front open type work box 9 is installed on the work plate 1 of FIG. 1 to perform the work has been described as an example, but the function of sucking the air on the work plate 1 is described. Therefore, even if polishing work or cutting work is performed on the work plate 1 without installing a box or a capsule, the generated dust 27 can be collected in the filter unit 4.

  Next, a dust collector according to a second embodiment of the present invention will be described. This dust collector uses a movable filter locking hanger 7A shown in FIG. 8 in place of the fixed filter locking hanger 7 fixed to the frame F in the dust collector 10 of FIG. Is the same as in the first embodiment. The filter locking hanger 7A includes a body 29 having front and rear hook portions 37a and 38a at a lower end, and a pair of front and rear first and second swing plates 30 and 33 that are rotatably supported by the body 29. I have. A pair of left and right front hook portions 37a are provided.

  The body 33 is formed by attaching a mounting plate portion 34 fixed to the frame F (FIG. 1) in a horizontal arrangement and bending the front and rear ends (left and right ends in the figure) of the mounting plate portion 34 at a right angle downward. The front plate portion 37 and the rear plate portion 38 are integrally provided with a left side mounting piece 39 and a right side mounting piece 40 formed by bending the left and right ends (front and rear both ends in the figure) of the mounting plate portion 34 at right angles. Yes. An insertion hole 34 a through which the dust suction pipe 3 is inserted is formed at the center of the mounting plate portion 34. The front plate portion 37 is formed with a rectangular cutout 37b at the center of the lower end, and two narrow front hook portions 37a projecting inward from the left and right sides of the cutout 37b. The rear plate portion 38 is provided with a wide rear hook portion 38a projecting inwardly from the central portion of the lower end. Insertion holes 39a and 40a for mounting shafts 45A and 45B, which will be described later, are formed at both front and rear end portions of the left and right mounting pieces 39 and 40, respectively.

  The vertical length L1 of the front plate portion 37 is formed slightly shorter than the vertical length L2 of the rear plate portion 38. Further, both the front hook portion 37a and the rear hook portion 38a are set such that the angles α1 and α2 (FIG. 9) with respect to the front plate portion 37 and the rear plate portion 38 are slightly larger than a right angle, for example, 110 degrees. Inclined in a downward slope toward the inside. Further, the rear hook portion 38a is set to have a slightly shorter protruding length than the front hook portion 37a.

  The first swing plate 30 on the front side is formed by bending a flat plate material that has been punched into a predetermined shape, so that an operation portion 35 having substantially the same vertical length as the front plate portion 37 of the body 29, and the operation portion An actuating plate portion 36 projecting inward (rearward) from the upper end of 35 and an approximately L-shaped pressing piece 44 projecting outward (forward) from the lower end of the operation portion 35 are integrally formed. ing. An operating piece 35 a that is formed to have a width smaller than the notch 37 b of the front plate portion 37 of the body 29 and is bent outward from the operating portion 35 is provided below the operating portion 35. The pressing plate portion 44 extending in the outward orthogonal direction from the lower end of the operating piece 35 is formed to have the same small width as the operating piece 35, and is inserted through the notch 37 b from the inside of the front plate portion 37 of the body 29. Thus, the front plate portion 37 can protrude outward. An angle β1 (FIG. 9) formed by the operation unit 35 and the operation plate unit 36 is set to be smaller than, for example, 70 degrees. The operation plate portion 36 is formed with a notch 36a through which the dust suction pipe 3 is inserted.

  The second swing plate 33 on the rear side is formed by bending a flat plate that has been punched into a predetermined shape, so that the interlocking portion 47 slightly longer than the length of the rear plate portion 38 of the body 29 in the vertical direction, and this interlocking. A passive plate portion 48 that protrudes inward from the upper end of the portion 47 is integrally formed. An angle β2 (FIG. 9) formed by the interlocking portion 47 and the passive plate portion 48 is set to an angle smaller than a right angle, for example, 75 degrees. A notch 47b through which the rear hook portion 37a of the body 29 is inserted is formed in the lower central portion of the interlocking portion 47, and the both sides of the notch 47b are bent outward at a small angle. A pair of operating pieces 47a are provided. Further, the passive plate portion 48 is formed with a notch 48a through which the dust suction pipe 3 is inserted.

  As indicated by arrows in FIG. 8, the filter-hanging hanger 7 </ b> A has two mounting shafts 45 </ b> A and 45 </ b> B that are respectively bent portions of the operating portion 35 and the operating plate portion 36 of the first swing plate 30. The inner and second swing plates 33 are inserted through the two opposing through holes 39a and 40a of the body 29 in a state of being applied along the inner sides of the bent portions of the interlocking portion 47 and the passive plate portion 48. Then, the first and second swing plates 30 and 33 are fastened by screwing and fastening the nuts 46 to the screw portions at the tips of the mounting shafts 45A and 45B extending between the left mounting piece 39 and the right mounting piece 40. However, the mounting shafts 45A and 45B are pivotally supported by the body 29 with the fulcrum.

  Further, as shown in FIG. 9A, the passive plate portion 48 of the second swing plate 33 is disposed above the operation plate portion 36 of the first swing plate 30. Accordingly, as shown in FIG. 9B, the second swing plate 33 receives rotational force by the counterclockwise rotation of the first swing plate 30, and the passive plate portion 48 is attached to the mounting plate portion 34 of the body 29. It can be rotated within a range until it comes into contact with the lower surface. As shown in FIG. 9A, the filter locking hanger 7 </ b> A has a mounting plate in a state where the dust suction pipe 3 is inserted into the insertion hole 34 a of the mounting plate portion 34 of the body 29 in the filter storage chamber 11. The part 34 is fixed to the frame F with a rivet or the like.

  FIG. 10 shows an inlet holding member 49 of the filter unit 4 suitable for being engaged with and disengaged from the filter locking hanger 7A. The inlet holding member 49 is formed in a rectangular outer shape in plan view by a material such as resin having elasticity, and an elliptical insertion hole 49a is formed at the center thereof. The insertion hole 49a has a circular shape into which the dust suction pipe 3 can be inserted in a slightly bent state shown in FIG. This insertion hole 49a is superposed on the insertion hole 24a of the seal member 24 and the insertion hole 4c of the filter main body 4a in the same manner as shown in FIG. 4 of the first embodiment, so that the filter unit Four inlet openings 6 are formed.

  In the inlet holding member 49 shown in FIG. 10, a plurality of fold lines 49b (in this embodiment, six cases are illustrated) extending in the width direction W of the filter body 4a, that is, in the left-right direction, are formed in the center portion. Relatively long locking pieces 49c positioned between notches 49d provided at both ends are provided at both ends parallel to the fold lines 49b, that is, both ends in the thickness direction (front-rear direction) T of the filter body 4a. In addition, a gripping portion 47f is formed on the outer side of both ends of the locking piece 49c by bending inside through a folding line 49e. As shown in FIG. 11, the inlet holding member 49 is bent to the filter main body 4a side (downward) along each fold line 49b, and the peripheral portion excluding the locking piece 49c and the gripping portion 49f is the filter main body. It is joined to 4a. Therefore, in the filter unit 4 having the inlet holding member 49, similarly to the first embodiment, the elastic inlet holding member 49 is passed through the plurality of folding lines 49b before the sales distribution process and before use. By forcibly folding it into two, it can be handled in a flat state by stacking it and making it bulky, so that it is easy to manage and handle.

  Next, the handling and operation of the dust collector 10 equipped with the filter locking hanger 7A will be described. When performing the polishing operation or the cutting operation, when the filter unit 4 of FIG. 11 is locked to the filter locking hanger 7A and attached to the suspended state, the pair of gripping portions 49f and 49f on the front side of the inlet holding member 49 are attached. Hold the filter unit 4 by hand, and insert the dust suction pipe 3 into the inlet opening 6 of the filter unit 4 shown in FIG. It inserts from below between a pair of hook parts 37a and 38a.

  At this time, the outer surface of the inlet holding member 49 is deformed so as to be folded in half while contacting the front and rear ends of the hook portions 37a and 38a, and the front and rear ends of the locking pieces 49c and 49c of the inlet holding member 49 are deformed. When the upper end of the hook portions 37a, 38a is reached, the deformed inlet holding member 49 opens outward by its own restoring force, so that both locking pieces 49c, 49c are placed on the upper surfaces of the hook portions 37a, 38a. Locks automatically. In this way, the filter unit 4 is detachably attached to the filter locking hanger 7A by a one-touch operation.

  Since the filter unit 4 can handle the pair of gripping portions 49f and 49f on the front side of the inlet holding member 49 shown in FIG. 11 by hand, the filter unit 4 can be attached to the filter locking hanger 7A. It can be done easily. FIG. 10 illustrates an inlet holding member 49 having a pair of gripping portions 49f at the left and right ends in the front-rear direction T in order to eliminate the front-rear directionality of the filter unit 4 at the time of attachment. However, the inlet holding member 49 may be provided with a pair of gripping portions 49f only on the front side.

  Further, since the inlet holding member 49 of the filter unit 4 is provided with a plurality of folding lines 49b around the insertion hole 49a, it is a single folding line like the inlet holding member 23 of FIG. 3 in the first embodiment. Unlike what bend | folds into an inverted V shape via 23a, while being easily bent to a curved shape, it has a big elastic force. Accordingly, a strong restoring force is generated along with a large elastic force in the inlet holding member 49 of FIG. 9A that is deformed at the time of mounting as described above, so that the hook portions 37a and 38a are located on the vertical front and rear plates of the body 29. Despite being formed in a shape that is inclined downward from the portions 37 and 38 inwardly, the hook portions 37a and 38a are strongly locked so that the tips of the locking pieces 49c and 49c do not fall off. .

  Further, since the rear plate portion 38 is longer in the vertical direction than the front plate portion 37, the rear hook portion 38a is positioned below the front hook portion 37a. At the time of attachment to the stop hanger 7A, the rear locking piece 49c of the filter unit 4 is locked to the rear hook portion 38a before the front side. As a result, it is possible to effectively prevent failure of locking to the rear hook portion 38a of the rear locking piece 49c which is difficult to see from the front and which is out of reach.

  With the filter unit 4 attached to the filter locking hanger 7A, the second swing plate 33 is inclined counterclockwise around the attachment shaft 45B with the interlocking portion 47 contacting the inlet holding member 49. As a result, the tip of the passive plate portion 48 presses the actuating plate portion 36 of the first swing plate 30 clockwise around the mounting shaft 45A, and balances with the counterclockwise moment due to the weight of the first swing plate 30 itself. Thus, the first swing plate 30 is held at the position shown in FIG. In this state, in the first swing plate 30, the pressing piece portion 44 penetrates the notch 37 b (FIG. 8) of the body 29 and projects forward from the front plate portion 37.

  When the dust 27 is filled inside the filter unit 4, the door 12 shown in FIG. 1 is opened, and then, as shown in FIG. 9B, the pressing piece 44 of the front first swing plate 30 is pointed. Press As a result, the first swing plate 30 receives an operating force in the operating direction for detaching the filter unit 4 and rotates counterclockwise around the mounting shaft 45A as shown in FIG. 9A. The posture moves from the posture to the posture illustrated by the solid line in FIG. 5B, and further to the posture illustrated by the two-dot chain line.

  When the first swing plate 30 rotates, the operating plate portion 36 of the first swing plate 30 springs up the passive plate portion 48 of the upper second swing plate 33, so that the interlocking portion 47 of the second swing plate 33 is the passive plate portion. Upon receiving the rotational force of the first swing plate 30 via 48, the posture moves from the posture shown in FIG. 9A to the posture shown in FIG. When the operating pieces 35a and 47a of the first and second swing plates 30 and 33 are both moved inward along with the rotation, the filter unit 4 is pressed from the front and the rear to respectively hold the inlet holding member. 49 is deformed into a closed shape, so that the filter unit 4 is detached from the filter locking hanger 7A when the front ends of the locking pieces 49c, 49c of the inlet holding member 49 leave the front ends of the hook portions 37a, 38a. Removed. Therefore, when the filter locking hanger 7A is used, the filter unit 4 can be quickly removed by a simple one-touch operation by simply pressing the pressing piece 44 of the first swing plate 30 with a finger. Then, the removal work of deforming the inlet holding member 49 by putting the hand into the narrow rear side of the filter unit 4 is eliminated.

  Further, since the front and rear hook portions 37a, 38a of the body 29 are both protruded inwardly and inclined in a downward slope, the first and second swing plates 30, 33 are removed when the filter unit 4 is removed. The engaging pieces 49c and 49c before and after the inlet holding member 49 that is deformed by being pressed by the respective operating pieces 35a and 47a move along the upper surfaces of the hook portions 37a and 38a with little resistance, and the hook portions 37a and 38a. To leave smoothly. This makes it easier to remove the filter unit 4.

  Further, the interlocking portion 47 of the second swing plate 33 is longer than the operation portion 35 of the first swing plate 30 and the rear hook portion 38a is slightly shorter than the front hook portion 37a. As shown, the release from the rear hook portion 38a of the rear locking piece 49c by the pressing of the operating piece 47a of the second swing plate 33 is the front locking by the pressing of the operating piece 35a of the first swing plate 30. It occurs before the piece 49c is detached from the front hook portion 37a. If the front side locking piece 49c is disengaged from the front hook portion 37a before the rear side, the rear side locking piece 49c may not be released in a state of being caught by the rear hook portion 38a. In this case, it is difficult to put the hand to the rear side of the filter unit 4, and it is considered that it is difficult to remove the filter unit 4. However, the occurrence of such a problem is caused by the filter locking hanger. It is prevented by using 7A.

  Even if the rear locking piece 49c is set to be detached from the rear hook portion 38a almost simultaneously with the front locking piece 49c from the front hook portion 37a, the same effect as described above can be obtained. Obtainable. In short, what is necessary is just to set so that detachment from the front hook portion 37a of the front locking piece 49c does not occur before the rear side.

It is a cutting side view showing a work bench with a dust collector concerning a 1st embodiment of the present invention. It is a perspective view which shows the attachment part of the filter unit in the work table 100 same as the above. It is a longitudinal cross-sectional view of the inlet part of a filter unit same as the above. It is an expansion | deployment top view of the inlet_port | entrance part of a filter unit same as the above. (A), (b) is the longitudinal cross-sectional view which showed the attachment process of the filter unit in order. It is a front view which shows the attachment state of a filter unit same as the above. It is a perspective view of a filter unit same as the above. It is a disassembled perspective view which shows the filter locking hanger in the dust collector which concerns on 2nd Embodiment of this invention. (A), (b) is the longitudinal cross-sectional view which showed the removal process of the filter unit in a dust collector same as the above in order. It is an expansion | deployment top view which shows the entrance holding member of the filter unit used for a dust collector same as the above. It is a perspective view which shows the attachment part of the filter unit in a dust collector same as the above. (A) is a cutaway side view showing an outline of a conventional workbench with a dust collector, and (b) is a perspective view showing a filter unit of the workbench.

Explanation of symbols

1 Work plate 2 Air introduction pipe (introduction passage)
DESCRIPTION OF SYMBOLS 3 Dust absorption pipe 3b Slit 4 Filter unit 4a Filter body 4b Inlet part 6 Inlet opening 7,7A Filter locking hanger 8 Suction machine 10 Dust collector 23 Inlet holding member 23c Locking piece
24 Seal member 27 Dust 29 Body 30 First swing plate 33 Second swing plate 35 Operation part 37a, 38a, 70 Hook part 47 Interlocking part 49 Inlet holding member 49c Locking piece (locking part)
49f Gripping part A Air T Longitudinal direction W Width direction

Claims (9)

A bag-like filter body extending vertically,
An inlet portion provided at an upper portion of the filter body and provided with an inlet opening for inserting a dust suction pipe for sucking air into the inner space of the bag;
The inlet portion has an inlet holding member that is fixed to the filter body and holds the inlet opening in a direction of opening,
A filter unit in which a locking portion for holding the filter main body in a suspended state is formed on the inlet holding member.   In Claim 1, The said inlet part has a sealing member which is inserted between the said inlet holding member and the said filter main body, and seals between the outer peripheral surface of the said dust suction pipe inserted, and the said inlet opening. Filter unit.   The filter unit according to claim 1 or 2, wherein gripping portions to be grasped by a hand are formed on both left and right sides of the front portion of the inlet holding member. A filter unit according to any one of claims 1, 2 or 3;
A dust suction pipe that is inserted into the inlet opening of the filter unit and extends inside and outside the filter body;
A dust collector comprising a suction device for sucking air from below the filter body.   5. The dust collector according to claim 4, wherein slits extending in a pipe axial direction are formed on both side portions of the dust suction pipe facing the filter main body in the width direction.   6. The dust collector according to claim 4, further comprising a filter locking hanger on which a locking portion of the filter unit is locked in a detachable manner.   In Claim 6, the said latching | locking part is provided with a pair of front and back, The said filter latching hanger has the hook part of the front and back by which the said latching | locking part is latched by the restoring force of the said inlet holding member at a lower end. A body, and a pair of front and rear first and second swing plates rotatably supported by the body, wherein the first swing plate receives the operation force in the operation direction and rotates the first swing plate An operating portion for disengaging the front locking portion from the front hook portion, and the second swing plate receives the rotational force by the rotation of the first swing plate in the operating direction, and the rear side A dust collector provided with an interlocking portion for separating the locking portion from the rear hook portion.   8. The dust collector according to claim 7, wherein separation of the rear locking portion by the second swing plate is set to occur simultaneously with or earlier than separation of the front locking portion by the first swing plate. A work plate, an introduction passage for introducing air on the work plate, and the dust collector according to any one of claims 4 to 8, wherein a dust suction pipe of the dust collector is connected to an outlet of the introduction passage. Working table.

Images