EP3015225B1 - Outil pneumatique - Google Patents

Outil pneumatique Download PDF

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Publication number
EP3015225B1
EP3015225B1 EP14818561.4A EP14818561A EP3015225B1 EP 3015225 B1 EP3015225 B1 EP 3015225B1 EP 14818561 A EP14818561 A EP 14818561A EP 3015225 B1 EP3015225 B1 EP 3015225B1
Authority
EP
European Patent Office
Prior art keywords
air supply
air
exhaust
exhaust pipe
pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14818561.4A
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German (de)
English (en)
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EP3015225A1 (fr
EP3015225A4 (fr
Inventor
Yasumasa Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Kohki Co Ltd
Original Assignee
Nitto Kohki Co Ltd
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Publication date
Application filed by Nitto Kohki Co Ltd filed Critical Nitto Kohki Co Ltd
Publication of EP3015225A1 publication Critical patent/EP3015225A1/fr
Publication of EP3015225A4 publication Critical patent/EP3015225A4/fr
Application granted granted Critical
Publication of EP3015225B1 publication Critical patent/EP3015225B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/005—Hydraulic driving means

Definitions

  • the present invention relates to air tools having an air motor driven by compressed air.
  • Air tools of the type described above include a belt-type grinding tool ( JP 4912976 B ) performing a grinding operation by rotationally driving an endless grinding belt and an air impact wrench ( JP 2001-138267 A ) for tightening bolts or the like.
  • These air tools have an air supply pipe constituting an air supply flow path for supplying compressed air to a built-in air motor.
  • the air supply pipe is provided in a housing constituting a grip part.
  • a space formed between the housing and the air supply pipe is utilized as an exhaust flow path for discharging compressed air discharged from the air motor.
  • US 2005/009457 A1 discloses a hand-held endless belt abrading machine comprising a base portion and a main portion, which portion is rotatable relative to the base portion around an axis extending in a forward and rearward direction of the abrading machine.
  • the main portion comprises an air motor having a rotational shaft extending in a direction transverse to the abrading machine and projecting from the left end of the air motor, so that an abrading endless belt assembly drivingly connected to the output shaft is positioned to the left relative to the motor and the base portion which is held by a hand of an operator.
  • the main portion is turned 180° relative to the base portion to shift the abrading endless belt assembly to the right relative to the base portion, thereby enabling the operator to readily observe the abrading belt assembly in operation.
  • US 5,954,142 A discloses a pneumatic power tool including a housing with a pistol handle, a pneumatic motor provided in the housing, a pressure air inlet passage and an exhaust air passage extending substantially in parallel through the pistol handle, and a manually operable throttle valve provided in the housing.
  • the pistol handle includes (i) a tubular stem rigidly secured to the housing and forming a portion of the air inlet passage, (ii) a separate hollow grip element surrounding at least partly the tubular stem and defining together with the tubular stem a portion of the exhaust air passage, and (iii) a clamping device arranged to detachably secure the grip element to the housing.
  • JP H01-171781 A discloses that in order to have an air supply/exhaust pipe rotated lightly by providing a bearing so that it contacts only bearing receivers for a hose-side joint and a valve ring, which are opposite to each other in axial direction, and making only the joint and the valve ring receive an air supply/exhaust pressure exerted upon the joint in thrust direction, a joint body with an air supply/exhaust passage for an air motor is connected to a motor case where the air motor is stored.
  • a hose-side joint with an air supply/exhaust pipe is connected to the body through a bearing, and a valve ring for making the rotation of the air motor on/off is provided on the outer peripheral surface side of the joint body.
  • a bearing is provided so as to be brought into contact with only each bearing receiver for the hose-side joint and the valve ring, which are opposite to each other in axial direction. Therefore, even if large air supply/exhaust pressure caused by compressed air is exerted upon the hose-side joint, an air supply pipe and an air exhaust pipe are lightly rotated in relation to the valve ring so that twist can be released.
  • JP 2002-505623 A discloses a replaceable, flexible and resilient grip which is slidably fitted over a generally cylindrical handle portion of a power hand tool housing.
  • the grip for use with a pistol grip housing with a separable end cap, the grip has a flange which is clamped between the end cap and the barrel of the housing and has lugs which fit in recesses in the barrel and end cap.
  • the grip also has a strap portion which fits between the trigger and the barrel and a flange which fits in a groove adjacent to the barrel.
  • the tool has an air exhaust port adjacent to the handle portion and the grip defines an exhaust air passage alongside the handle portion, the grip being held in place by a retaining plate.
  • JP 2006-289607 A discloses that in order to promote easy installation and removal of a needle chisel holder, a striking tool has a stop ring defining the front end of a sliding range of the needle chisel holder, and a stop wire wing for preventing the stop ring from slipping out forward from a cylinder, that is, the stop wire ring having a forwardly projecting lug part in its both ends and putting the lug part in an elastically expanded state by opening the lug part by inserting the lug part up to a position of an annular groove from a front end opening of the cylinder in a state of reducing a diameter of the stop wire ring by holding the lug part to mutually approach.
  • the cylinder has a cutout reaching the annular groove by extending backward from its front edge, and allows the lug part to extend forward by going over the front end of the cylinder by passing through the cutout in a state of elastically extending the stop wire ring in the annular groove.
  • an object of the present invention is to provide an air tool having an exhaust pipe configured to reduce cooling of the housing by adiabatic expansion of exhaust air.
  • Another object of the present invention is to provide an air tool having an exhaust pipe configured to prevent hydraulic fluid from leaking onto the grip part of the housing.
  • the present invention provides an air tool driven by an air motor, as set forth in claim 1. Preferred embodiments of the present invention may be gathered from the dependent claims.
  • the exhaust pipe is a discrete member formed separately from the air supply/exhaust pipe accommodating part.
  • the exhaust pipe disposed in the tool housing is a discrete member formed separately from the air supply/exhaust pipe accommodating part; therefore, it is possible to avoid direct cooling of the tool housing by exhaust air cooled by adiabatic expansion. Thus, it is possible to suppress the tool housing from getting cold. Further, because exhaust air is discharged to the outside without directly contacting the air supply/exhaust pipe accommodating part, the hydraulic fluid in the discharged compressed air can be prevented from leaking to the outside through a gap in the air supply/exhaust pipe accommodating part.
  • the exhaust pipe is disposed so that a clearance is formed between the exhaust pipe and the sidewall of the air supply/exhaust pipe accommodating part.
  • Provision of a clearance between the exhaust pipe and the air supply/exhaust pipe accommodating part makes it possible to improve heat insulation between the exhaust pipe and the air supply/exhaust pipe accommodating part and to further suppress cooling of the tool housing by adiabatically expanded exhaust air.
  • the arrangement may be as follows.
  • the exhaust pipe is engaged at a part thereof with the air supply/exhaust pipe accommodating part so as to be supported by the air supply/exhaust pipe accommodating part, and a recess is provided in at least one of the part of the exhaust pipe and the air supply/exhaust pipe accommodating part engaged with the part of the exhaust pipe, so that a clearance is formed between the part of the exhaust pipe and the air supply/exhaust pipe accommodating part engaged with the part of the exhaust pipe.
  • the air supply pipe may be a discrete member formed separately from the air supply/exhaust pipe accommodating part and disposed so that a clearance is formed between the air supply pipe and the sidewall of the air supply/exhaust pipe accommodating part.
  • the air supply pipe is also formed as a discrete member separate from the air supply/exhaust pipe accommodating part, in addition to the exhaust pipe, it is possible to facilitate manufacture as compared with a structure in which the exhaust pipe and the air supply pipe are formed integrally with the air supply/exhaust pipe accommodating part. Further, because a clearance is formed between the air supply pipe the sidewall of the air supply/exhaust pipe accommodating part, it is possible to avoid direct cooling of the tool housing by the air supply pipe, which is cooled as the exhaust pipe is cooled by the adiabatic expansion of compressed air.
  • the air supply pipe and the exhaust pipe may be integrally formed with each other.
  • the arrangement may be as follows.
  • the air supply outlet of the air supply pipe is located above the exhaust inlet of the exhaust pipe, and the air supply inlet of the air supply pipe is located below the exhaust outlet of the exhaust pipe.
  • the air supply flow path of the air supply pipe extends substantially rectilinearly from the air supply inlet to the air supply outlet.
  • the exhaust pipe has a first and second intermediate portions branching off laterally from an intermediate point between the exhaust inlet and the exhaust outlet, the first and second intermediate portions extending to sandwich the air supply pipe from both sides.
  • the terms “above” and “below” as used herein mean a positional relationship in a structure in which, with “the air motor accommodating part” assumed to be located at a forward position, “the air supply/exhaust pipe accommodating part” is provided to extend rearward from the air motor accommodating part substantially in a horizontal direction, and that the terms should not necessarily be construed as meaning a positional relationship during use of the air tool.
  • the structure in which the air supply inlet of the air supply pipe, which is connected to the compressed air supply source, is disposed below the exhaust outlet makes it possible to prevent exhaust air from hitting an air hose dangling from the air supply inlet. Further, because the air supply flow path is substantially rectilinear, it is possible to minimize the pressure loss when compressed air is supplied to the air motor. Further, because the intermediate part of the exhaust pipe is configured to sandwich the air supply pipe from both sides, it is possible to reduce the curvature of the exhaust flow path while ensuring the flow path cross-sectional area at the intermediate part of the exhaust flow path as compared with a structure in which the whole intermediate part of the exhaust pipe extends through one side of the air supply pipe extending rectilinearly, and hence possible to reduce the flow path resistance.
  • the arrangement may also be as follows.
  • the air supply outlet of the air supply pipe is located below the exhaust inlet of the exhaust pipe, and the air supply inlet of the air supply pipe is located below the exhaust outlet of the exhaust pipe.
  • the air supply flow path and the exhaust flow path are disposed parallel to each other.
  • the arrangement may be as follows.
  • the air tool further includes a first seal member disposed between the air supply outlet of the air supply pipe and the compressed air inlet of the tool housing, and a second seal member disposed between the exhaust inlet of the exhaust pipe and the compressed air outlet of the tool housing.
  • the air supply pipe and the exhaust pipe are disposed in the air supply/exhaust pipe accommodating part by being inserted thereinto in a substantially perpendicular direction substantially perpendicular to the air supply flow path and the exhaust flow path.
  • the air supply outlet of the air supply pipe has an end face inclined with respect to the substantially perpendicular direction so as to face toward the direction.
  • the first seal member has a surface to be abutted against the end face of the air supply outlet.
  • the surface of the first seal member is inclined with respect to the substantially perpendicular direction so as to sealingly engage the end face of the air supply outlet of the air supply pipe as inserted into the air supply/exhaust pipe accommodating part.
  • the exhaust inlet of the exhaust pipe has an end face inclined with respect to the substantially perpendicular direction so as to face toward the direction.
  • the second seal member has a surface to be abutted against the end face of the exhaust outlet.
  • the surface of the second seal member is inclined with respect to the substantially perpendicular direction so as to sealingly engage the end face of the exhaust inlet of the exhaust pipe as inserted into the air supply/exhaust pipe accommodating part.
  • the first and second seal members are gradually compressed by the air supply outlet and the exhaust inlet, respectively, as the air supply pipe and the exhaust pipe are inserted into the air supply/exhaust pipe accommodating part of the tool housing in a direction substantially perpendicular to the air supply flow path and the exhaust flow path. Consequently, sliding friction acting on each seal member is reduced as compared with a structure in which the air supply outlet, the exhaust inlet and the seal members are not inclined, and the possibility of each seal member being damaged by friction is reduced.
  • the air tool may further include a valve disposed in the air supply pipe to selectively open and close the air supply flow path.
  • the arrangement may be as follows.
  • the air tool further includes a valve control member extending from the outside of the air supply pipe into the air supply flow path, without extending through the exhaust flow path, and engaged with the valve.
  • the valve is selectively opened and closed by operating the valve control member from the outside.
  • valve control member does not extend through the exhaust flow path, it is unnecessary to provide a seal structure in the exhaust flow path to seal between the valve control member and the exhaust flow path, and it is possible to simplify the structure.
  • an air tool 10 is a belt-type grinding tool.
  • the belt-type grinding tool 10 includes a tool housing 20 accommodating an air motor 12, a drive pulley 80 secured to an output shaft 14 of the air motor 12, a pulley support body part 82 attached to the tool housing 20 so as to cover the drive pulley 80 and extending forward, a pulley support bar 84 longitudinally slidably attached to the pulley support body part 82 and extending forward, and an idle pulley 86 rotatably attached to a distal end portion 84-1 of the pulley support bar 84.
  • an endless grinding belt 87 wound around the drive pulley 80 and the idle pulley 86 is driven to rotate by the driving force of the air motor 12.
  • the tool housing 20 comprises a circular cylindrical air motor accommodating part 21 and a tubular air supply/exhaust pipe accommodating part 24 extending rearward from the air motor accommodating part 21 to a rear opening end 22.
  • the air motor accommodating part 21 has an air motor 12 disposed therein.
  • an air supply/exhaust pipe accommodating part 24 is disposed an air supply/exhaust pipe 40 which is a discrete member separate from the tool housing 20.
  • the air motor accommodating part 21 has a compressed air inlet 21-1 for supplying compressed air to the air motor 12.
  • the compressed air inlet 21-1 is open in the air supply/exhaust pipe accommodating part 24.
  • the air supply/exhaust pipe 40 has an integral structure comprising an air supply pipe 41 constituting an air supply flow path 41-1 and an exhaust pipe 42 constituting an exhaust flow path 42-1.
  • the air supply/exhaust pipe 40 is disposed in the air supply/exhaust pipe accommodating part 24 such that an air supply outlet 41-2 at the forward end of the air supply pipe 41 is connected to the compressed air inlet 21-1 through a seal member 50, and that an exhaust inlet 42-2 at the forward end of the exhaust pipe 42 is connected to the compressed air outlet 21-2 through a seal member 52.
  • the air supply pipe 41 has an air supply inlet 41-3 at the rear end thereof.
  • a coupling 54 for connecting an air tube (not shown) connected to a compressed air supply source.
  • the coupling 54 is engaged at an engagement groove 55 with a coupling retaining pin 56 inserted in a pin insertion hole 44 ( Fig. 7 ) extending transversely through the air supply/exhaust pipe 40, thereby allowing the coupling 54 to be held from coming off the air supply flow path 41-1 and also allowing the coupling 54 to be rotatable about a longitudinal axis.
  • the air supply flow path 41-1 extends substantially rectilinearly from the air supply inlet 41-3 to the air supply outlet 41-2 to suppress the pressure loss when compressed air supplied from the compressed air supply source passes therethrough.
  • the exhaust pipe 42 extends from the exhaust inlet 42-2 connected to the compressed air outlet 21-2 to an exhaust outlet 42-3 located in the upper part of the rear opening end 22 of the tool housing 20, while three-dimensionally crossing the air supply pipe 41 at a point halfway to the exhaust outlet 42-3.
  • the exhaust pipe 42 has an intermediate part 42-4 between the exhaust inlet 42-2 and the exhaust outlet 42-3.
  • the intermediate part 42-4 comprises two laterally branching portions, i.e. a first intermediate portion 42-4a, and a second intermediate portion 42-4b.
  • the first intermediate portion 42-4a and the second intermediate portion 42-4b cross the air supply pipe 41 three-dimensionally while extending in such a manner as to sandwich a part of the air supply pipe 41 from both sides.
  • the exhaust flow path 42-1 formed by the thus-configured exhaust pipe 42 has a flow path configuration in which a single flow path is branched into two flow paths at the intermediate part 42-4 and thereafter reintegrated into one flow path.
  • a flow path configuration makes it possible to reduce the curvature of the exhaust flow path 42-1 while ensuring the flow path cross-sectional area at the intermediate part 42-4 of the exhaust flow path 42-1 as compared with a structure in which the intermediate part 42-4 is configured to extend through one side of the air supply pipe 41, which extends rectilinearly, and hence possible to reduce the flow path resistance.
  • both sides of the air supply pipe 41 passing near the transverse center of the tool housing 20 are utilized as the exhaust flow path 42-1, thereby minimizing the width of the air supply/exhaust pipe 40, particularly the width in the lateral direction (vertical direction as seen in Fig. 4 ), and thus minimizing the width of the air supply/exhaust pipe accommodating part 24, which accommodates the air supply/exhaust pipe 40.
  • a grip part 26 formed by the outer peripheral surface of the air supply/exhaust pipe accommodating part 24 can be made compact in configuration.
  • the tool housing 20 is a member made of a resin material
  • the air supply/exhaust pipe 40 is a member made of a metallic material, which is formed by casting.
  • the air supply flow path 41-1 of the air supply pipe 41 is provided therein with a valve 60 for controlling the supply of compressed air to the air motor 12 by opening and closing the air supply flow path 41-1.
  • the valve 60 comprises a valve seal member 62 sealingly engageable with a seal surface 47 formed on a step portion 46 provided in the air supply flow path 41-1, a valve rod 63 extending from a rear end portion 63-1 secured to the valve seal member 62 toward the air supply outlet 41-2 in the air supply flow path 41-1, and a spring 64 provided between the valve seal member 62 and the forward end face of the coupling 54 in the air supply flow path 41-1 so as to press the valve seal member 62 against the seal surface 47.
  • the valve 60 is opened and closed from the outside of the air supply/exhaust pipe 40 through a valve control member 66 extending into the air supply flow path 41-1 through an opening 48 provided in the sidewall of the air supply pipe 41.
  • the valve control member 66 is disposed in such a way that a distal end portion 63-2 of the valve rod 63 is inserted in an insertion hole 66-1 provided in the distal end portion of the valve control member 66.
  • valve operating lever 70 for a worker to open and close the valve 60.
  • the valve operating lever 70 is pivotally attached to the tool housing 20 so as to be pivotable about a pivot shaft 72 located in the air supply/exhaust pipe accommodating part 24.
  • the valve operating lever 70 has an operating surface 70-1 exposed to the outside of the tool housing 20. In response to pressing the operating surface 70-1 upward as seen in the figure, the valve operating lever 70 pivots clockwise as seen in the figure from a position where the valve operating lever 70 projects downward from the tool housing 20, which is shown in Fig. 1 , to a position where the valve operating lever 70 has been pushed into the tool housing 20, which is shown in Fig. 5 .
  • valve operating lever 70 is in engagement with a rear end face 66-2 of the valve control member 66 at an engagement surface 70-2 located to face the air supply/exhaust pipe 40, so that, by pivoting the valve operating lever 70, the valve control member 66 can be pushed into the air supply flow path 41-1 to open the valve 60, as stated above.
  • the valve operating lever 70 is provided with a screw shaft 74 retained to the valve operating lever 70 such that the screw shaft 74 is slidable in the direction of its longitudinal axis but non-rotatable about the longitudinal axis.
  • the valve operating lever 70 is further provided with a nut 76 rotatable in engagement with the screw shaft 74, and an abutment member 78 secured to the distal end of the screw shaft 74.
  • the abutment member 78 When the valve operating lever 70 is pivoted, the abutment member 78 abuts against an inclined abutment surface 49 provided on the lower outer surface of the air supply/exhaust pipe 40, thereby limiting the pivoting range of the valve operating lever 70. Further, the abutment member 78 is axially movable, together with the screw shaft 74, by rotating the nut 76. By changing the position of the abutment member 78, it is possible to adjust the pivoting position of the valve operating lever 70 when the abutment member 78 abuts against the inclined abutment surface 49 of the air supply/exhaust pipe 40.
  • Adjusting the pivoting range of the valve operating lever 70 in this way causes a change in the amount by which the valve control member 66 is pushed into the air supply flow path 41-1, resulting in an adjustment of the degree of opening of the valve 60 when the valve operating lever 70 is pushed in.
  • the valve control member 66 is provided to extend into the air supply flow path 41-1 without passing through the exhaust flow path 42-1; therefore, the opening 48 for guiding the valve control member 66 into the air supply flow path 41-1 is provided only in the air supply pipe 41, but not provided in the exhaust pipe 42. Accordingly, the area that requires sealing for the valve control member 66 is limited to that between the valve control member 66 and the air supply pipe 41. Consequently, the number of sealed portions reduces, and the structure can be simplified. In addition, the sliding resistance generated by sealing members reduces, so that it is possible to improve operability when opening and closing the valve.
  • valve operating lever 70 When the pressing force applied to the operating surface 70-1 of the valve operating lever 70 is removed, the valve operating lever 70 is pressed to pivot counterclockwise through the valve control member 66 by the urging force of the spring 64, which urges the valve seal member 62 to return to a closed position where the air supply flow path 41-1 is closed. Thus, the valve operating lever 70 returns to the position shown in Fig. 1 . It should be noted that, when compressed air is being supplied through the coupling 54, the pressure of compressed air also acts as a force returning the valve seal member 62 to the closed position. In other words, the urging force of the spring 64 and the pressure of compressed air cause, in combination, the valve operating lever 70 to be returned to the position ( Fig. 1 ) assumed before the lever pressing operation.
  • compressed air having rotationally driven the air motor 12 is discharged from the exhaust ports 12-2 of the air motor 12, and immediately after the discharge from the exhaust ports 12-2, the compressed air is rapidly reduced in pressure and expanded adiabatically.
  • Adiabatically expanded air lowers its temperature; therefore, the exhaust pipe 42 is cooled by the air lowered in temperature.
  • the side surface of the exhaust pipe 42 in the air supply/exhaust pipe 40 is, as shown in Fig. 6 , disposed in the air supply/exhaust pipe accommodating part 24 in engagement with a sidewall 28 of the air supply/exhaust pipe accommodating part 24.
  • the air supply/exhaust pipe 40 which is made of a metallic material, is disposed in engagement with the air supply/exhaust pipe accommodating part 24 of the tool housing 20, which is made of a resin material, whereby the tool housing 20 is supported from inside by the air supply/exhaust pipe 40, thereby imparting necessary and sufficient rigidity to the grip part 26 of the tool housing 20.
  • a part of the air supply/exhaust pipe accommodating part 24 that engages the exhaust pipe 42 is provided with a plurality of recesses 30, thereby forming gaps between the air supply/exhaust pipe accommodating part 24 and the air supply/exhaust pipe 40 to reduce the area of contact therebetween.
  • clearances are formed between the air supply/exhaust pipe 40 and the top and bottom walls 32 and 34, respectively, of the air supply/exhaust pipe accommodating part 24.
  • clearances are provided between the air supply/exhaust pipe 40 and the air supply/exhaust pipe accommodating part 24, which forms the grip part 26, and the part of the air supply/exhaust pipe accommodating part 24 that engages the air supply/exhaust pipe 40 is provided with the recesses 30 to reduce the area of contact therebetween, thereby making it difficult for heat to be transferred between the grip part 26 and the air supply/exhaust pipe 40. That is, it is possible to suppress cooling of the grip part 26 by the exhaust pipe 42 cooled by adiabatic expansion of compressed air during use of the air tool 10.
  • the distal end portion 84-1 of the pulley support body part 82 attached to the tool housing 20 is provided with a bar accommodating hole 82-1 receiving the pulley support bar 84.
  • the bar accommodating hole 82-1 has a sliding insert 88 inserted therein.
  • the sliding insert 88 is secured to the pulley support body part 82 by a securing screw 89 engaged with a threaded hole 82-2 extending through the pulley support body part 82 from a side surface thereof to the bar accommodating hole 82-1.
  • the pulley support bar 84 is inserted into an inner bore of the sliding insert 88, which has a smoothed surface, thereby being retained slidably in the longitudinal direction relative to the pulley support body part 82.
  • the pulley support bar 84 has a longitudinally extending slot-shaped sliding limiting hole 84-2 formed in a side surface thereof.
  • the pulley support body part 82 is provided with a positioning screw 90 inserted from the side surface thereof to extend into the slot-shaped sliding limiting hole 84-2, which extends by a predetermined length in the longitudinal direction of the pulley support bar 84, through a through-hole 88-1 in the sliding insert 88.
  • the positioning screw 90 holds the pulley support bar 84 from rotating and also limits the longitudinal slidable range of the pulley support bar 84.
  • the pulley support bar 84 is formed with a spring accommodating hole 84-4 extending forward from a rear end face 84-3 thereof.
  • the spring accommodating hole 84-4 is provided therein with a spring 92 for urging the pulley support bar 84 forwardly.
  • the spring 92 has a front end portion 92-1 abutting against a front end face 84-5 of the spring accommodating hole 84-4 and a rear end portion 92-2 extending rearward beyond the rear end face 84-3 of the pulley support bar 84.
  • the pulley support body part 82 has a spring support member 94 attached thereto at a position rearward of the bar accommodating hole 82-1 to support the spring 92 from a position rearward thereof.
  • the spring support member 94 is pivotable about a pivot shaft 94-1 provided on the pulley support body part 82. When the spring support member 94 is in the position shown in Fig.
  • a spring support projection 94-2 of the spring support member 94 engages a spring seat 96 disposed at the rear end portion 92-2 of the spring 92 to compress the spring 92 between the spring support projection 94-2 and the pulley support bar 84.
  • the idle pulley 86 which is provided at the forward end portion of the pulley support bar 84, is pressed against the inner peripheral surface of the endless grinding belt 87 to apply a predetermined tension to the endless grinding belt 87.
  • the spring support member 94 is rotated clockwise as seen in the figure through approximately 90 degrees, the spring seat 96 is released from support by the spring support projection 94-2, and the spring 92 extends to its natural length.
  • the pulley support bar 84 is movable rearward without receiving the urging force of the spring 92. Consequently, a clearance is formed between the idle pulley 86 and the endless grinding belt 87; therefore, it is possible to remove the endless grinding belt 87.
  • the spring support member 94 has a cover 98 attached thereto to cover the drive pulley 80 from one side. The cover 98 is configured to pivot together with the spring support member 94.
  • Figs. 8 to 10 show an air tool 110 according to a second embodiment of the present invention.
  • the air tool 110 differs from the air tool 10 according to the above-described first embodiment mainly in the structure of the flow path of compressed air.
  • the air supply outlet 141-2 of the air supply pipe 141 is located below the exhaust inlet 142-2 of the exhaust pipe 142, and the air supply inlet 141-3 of the air supply pipe 141 is located below the exhaust outlet 142-3 of the exhaust pipe 142, and further, the air supply flow path 141-1 and the exhaust flow path 142-1 are disposed parallel to each other.
  • the compressed air inlet 121-1 and compressed air outlet 121-2 of the tool housing 120 are positioned in reverse relation to those of the air tool 10 according to the first embodiment. That is, the compressed air inlet 121-1 is located below the compressed air outlet 121-2.
  • Compressed air supplied from the air supply inlet 141-3 of the air supply pipe 141 passes through the air supply flow path 141-1 and the air supply outlet 141-2 and enters the air motor 112 through the air supply port 112-1 of the air motor 112. In the air motor 112, compressed air flows counterclockwise as seen in the figure while driving the air motor 112 to rotate in the same direction.
  • Compressed air discharged from the exhaust ports 112-2 of the air motor 112 reverses the direction of its flow and flows clockwise through an annular flow path 112-3 formed outside the air motor 112.
  • the compressed air enters the exhaust flow path 142-1 from the compressed air outlet 121-2 and is discharged to the outside from the exhaust outlet 142-3.
  • the tool housing 120 comprises, as shown in Fig. 9 , a right-side part 120-1, a left-side part 120-2, and a cap part 120-3.
  • the air supply/exhaust pipe 140 is inserted into the air supply/exhaust pipe accommodating part 124 of the right-side part 120-1 in a direction D (rightward direction) substantially perpendicular to the air supply flow path 141-1 and the exhaust flow path 142-1.
  • the air supply/exhaust pipe 140 is disposed in the air supply/exhaust pipe accommodating part 124.
  • a first seal member 150 is disposed between the air supply outlet 141-2 of the air supply pipe 141 and the compressed air inlet 121-1 of the tool housing 120.
  • a second seal member 152 is disposed between the exhaust inlet 142-2 of the exhaust pipe 142 and the compressed air outlet 121-2 of the tool housing 120.
  • An end face 141-4 of the air supply outlet 141-2 of the air supply pipe 141 is, as shown in Fig. 9 , inclined with respect to the direction D so as to face toward the direction D.
  • a surface 151 of the first seal member 150 that abuts against the air supply outlet 141-2 is similarly inclined.
  • an end face 142-4 of the exhaust inlet 142-2 of the exhaust pipe 142 and a surface 153 of the second seal member 152 that abuts against the exhaust inlet 142-2 are also inclined similarly to the end face 141-4 and the surface 151.
  • the respective distances between the surfaces 151 and 153 of the first and second seal members 150 and 152 and the associated end faces 141-4 and 142-4 of the air supply/exhaust pipe 140 gradually decrease, and eventually, the surfaces 151 and 153 of the first and second seal members 150 and 152 abut against the end faces 141-4 and 142-4, respectively, of the air supply/exhaust pipe 140.
  • the first and second seal members 150 and 152 are gradually compressed by the end faces 141-4 and 142-4, respectively, of the air supply/exhaust pipe 140.
  • the first and second seal members 150 and 152 are sealingly engaged with the end faces 141-4 and 142-4, respectively, of the air supply/exhaust pipe 140.
  • the air supply/exhaust pipe 140 is inserted into the right-side part 120-1
  • the air supply/exhaust pipe 140 may be inserted into the left-side part 120-2.
  • the direction D is the leftward direction.
  • the tool housing 120 may be configured to be splittable vertically, but not laterally, so that the air supply/exhaust pipe 140 is vertically inserted into the air supply/exhaust pipe accommodating part 124 of the tool housing 120.
  • first and second seal members 150 and 152 may be employed in the air tool 10 of the first embodiment.
  • first seal member 150 and the second seal member 152 are of an integrated structure, the first and second seal members 150 and 152 may be discrete members.
  • the air supply/exhaust pipes 40 and 140 which are cooled by compressed air, are provided as discrete members separate from the tool housings 20 and 120, which constitute the grip parts 26 and 126, respectively. Therefore, it is possible to improve heat insulation between the air supply/exhaust pipe 40 (140) and the tool housing 20 (120) and hence possible to avoid direct cooling of the grip part 26 (126) by compressed air lowered in temperature by adiabatic expansion. Thus, it is possible to suppress the grip part 26 (126) from getting cold.
  • joints between the members are formed in sealed structures to form flow paths.
  • the air supply/exhaust pipe 40 (140) is a discrete member formed with the air supply flow path 41-1 (141-1) and the exhaust flow path 42-1 (142-1), which is separate from the tool housing 20 (120). Therefore, the number of sealed points in flow paths through which compressed air passes is reduced as compared with the conventional air tools. Accordingly, the structure can be simplified, and it is also possible to reduce leakage of compressed air and hydraulic fluid contained in the compressed air through the sealed portions.
  • the air supply pipe 41 (141) and the exhaust pipe 42 (142) are integrally formed into the air supply/exhaust pipe 40 (140), the air supply pipe 41 (141) and the exhaust pipe 42 (142) may be formed as separate members.
  • the air tool 10 (110) according to the present invention has been explained with regard to the belt-type grinding tool 10 (110), by way of example, the air tool 10 (110) is not necessarily limited to belt-type grinding tools but may be other air tools such as an air impact wrench.

Claims (8)

  1. Outil pneumatique (10) entraîné par un moteur pneumatique (12), l'outil pneumatique (10) comprenant :
    un boîtier d'outil (20) ayant une partie recevant le moteur pneumatique (21), dans laquelle est logée le moteur pneumatique (12), et une partie tubulaire recevant des conduits d'admission / d'échappement d'air (24), s'étendant de la partie recevant le moteur pneumatique (21) à une extrémité arrière ouverte (22), la partie recevant le moteur pneumatique (21) ayant une entrée d'air comprimé (21-1) pour fournir de l'air comprimé au moteur pneumatique (12) et une sortie d'air comprimé (21-2) pour évacuer l'air comprimé du moteur pneumatique (12), l'entrée d'air comprimé (21-1) et la sortie d'air comprimé (21-2) étant toutes deux ouvertes vers la partie recevant les conduits d'admission / d'échappement d'air (24) ;
    un conduit d'alimentation en air (41) disposé dans la partie recevant les conduits d'admission / d'échappement d'air (24) du boîtier d'outil (20), le conduit d'alimentation en air (41) ayant une entrée d'alimentation en air (41-3) située à proximité de l'extrémité arrière ouverte (22) pour recevoir de l'air comprimé provenant d'une source d'alimentation en air comprimé, une sortie d'alimentation en air (41-2) communicant avec l'entrée d'air comprimé (21-1), et une voie d'écoulement d'alimentation en air (41-1) allant de l'entrée d'alimentation en air (41-3) à la sortie d'alimentation en air (41-2) ; et
    un conduit d'échappement (42) disposé dans la partie recevant les conduits d'admission / d'échappement d'air (24) du boîtier d'outil (20), le conduit d'échappement (42) ayant une entrée d'échappement (42-2) communiquant avec la sortie d'air comprimé (21-2), une sortie d'échappement (42-3) située à proximité de l'extrémité arrière ouverte (22) pour évacuer l'air comprimé hors de la partie recevant les conduits d'admission / d'échappement d'air (24), et une voie d'écoulement d'échappement (42-1) allant de l'entrée d'échappement (42-2) à la sortie d'échappement (42-3) ;
    dans lequel le conduit d'échappement (42) est un élément distinct, formé séparément de la partie recevant les conduits d'admission / d'échappement d'air (24) ;
    dans lequel la partie recevant les conduits d'admission / d'échappement d'air (24) a une paroi supérieure (32), une paroi inférieure (34), des parois latérales (28) de part et d'autre du conduit d'échappement (42) et reliant la paroi supérieure (32) et la paroi inférieure (34),
    caractérisé en ce que
    le conduit d'échappement (42) est disposé de sorte que le conduit d'échappement (42) soit en contact avec les parois latérales (28) et qu'un espace soit formé entre le conduit d'échappement (42) et les parois supérieure et inférieure (32, 34), et
    en ce que
    au moins une des parois latérales (28) présente un renfoncement (30) de sorte qu'un jeu est formé entre le conduit d'échappement (42) et la au moins une des parois latérales (28).
  2. Outil à air selon la revendication 1, dans lequel le conduit d'alimentation en air (41) est un élément distinct, formé séparément de la partie recevant les conduits d'admission / d'échappement d'air (24) et disposé de sorte qu'un espace soit formé entre le conduit d'alimentation en air (41) et une paroi latérale (28) de la partie recevant les conduits d'admission / d'échappement d'air (24).
  3. Outil à air selon la revendication 2, dans lequel le conduit d'alimentation en air (41) et le conduit d'échappement (42) sont intégralement formés l'un avec l'autre.
  4. Outil à air selon la revendication 3, dans lequel la sortie d'alimentation en air (41-3) du conduit d'alimentation en air (41) est située au-dessus de l'entrée d'échappement (42-2) du conduit d'échappement (42), et l'entrée d'alimentation en air (41-3) du conduit d'alimentation en air (41) est située en dessous de la sortie d'échappement (42-3) du conduit d'échappement (42) ;
    la voie d'écoulement d'alimentation en air (41-1) du conduit d'alimentation en air (41) s'étendant sensiblement de manière rectiligne de l'entrée d'alimentation en air (41-3) jusqu'à la sortie d'alimentation en air (41-2) ; et
    le conduit d'échappement (42) ayant des première et seconde portions intermédiaires (42-4, 42-4a, 42-4b) se séparant latéralement d'un point intermédiaire entre l'entrée d'échappement (42-2) et la sortie d'échappement (42-3), les première et seconde portions intermédiaires (42-4, 42-4a, 42-4b) prenant en sandwich le conduit d'alimentation en air (41) des deux côtés.
  5. Outil à air selon la revendication 3, dans lequel la sortie d'alimentation en air (41-2) du conduit d'alimentation en air (41) est située en dessous de l'entrée d'échappement (42-2) du conduit d'échappement (42), et l'entrée d'alimentation en air (41-3) du conduit d'alimentation en air (41) est située en dessous de la sortie d'échappement (42-3) du conduit d'échappement (42) ;
    la voie d'écoulement d'alimentation en air (41-1) et la voie d'écoulement d'échappement (42-1) étant disposées parallèlement l'une à l'autre.
  6. Outil à air selon l'une quelconque des revendications 2 à 5, comprenant en outre :
    un premier élément d'étanchéité (150) disposé entre la sortie d'alimentation en air (141-2) du conduit d'alimentation en air (141) et l'entrée d'air comprimé (121-1) du boîtier d'outil (120) ; et
    un second élément d'étanchéité (152) disposé entre l'entrée d'échappement (142-2) du conduit d'échappement (142) et la sortie d'air comprimé (121-2) du boîtier d'outil (120) ;
    le conduit d'alimentation en air (141) et le conduit d'échappement (142) étant configurés pour être disposés dans la partie recevant les conduits d'admission / d'échappement d'air (24) en y étant insérés dans une direction sensiblement perpendiculaire, sensiblement perpendiculaire à la voie d'écoulement d'admission d'air (141-1) et à la voie d'écoulement d'échappement (142-1) ;
    la sortie d'alimentation en air (141-2) du conduit d'alimentation en air (141) ayant une face d'extrémité (141-4) inclinée par rapport à la direction sensiblement perpendiculaire (D) de manière à faire face à la direction (D), le premier élément d'étanchéité (150) ayant une surface (151) destinée à venir en butée contre la face d'extrémité (141-4) de la sortie d'alimentation en air (141-2), la surface (151) du premier élément d'étanchéité (150) étant inclinée par rapport à la direction sensiblement perpendiculaire (D) de manière à venir en contact étanche avec la face d'extrémité (141-4) de la sortie d'alimentation en air (141-2) du conduit d'alimentation en air (141) lorsque le conduit d'alimentation en air (141) a été inséré dans la partie recevant les conduits d'admission / d'échappement d'air (24) ;
    l'entrée d'échappement (142-2) du conduit d'échappement (142) ayant une face d'extrémité (142-4) inclinée par rapport à la direction sensiblement perpendiculaire (D) de manière à faire face à la direction (D), le second élément d'étanchéité (152) ayant une surface (153) destinée à venir en butée contre la face d'extrémité (142-4) de la sortie d'échappement (142-2), la surface (153) du second élément d'étanchéité (152) étant inclinée par rapport à la direction sensiblement perpendiculaire (D) de manière à venir en contact étanche avec la face d'extrémité (142-4) de l'entrée d'échappement (142-2) du conduit d'échappement (142) lorsque le conduit d'échappement (142) a été inséré dans la partie recevant les conduits d'admission / d'échappement d'air (24).
  7. Outil à air selon l'une quelconque des revendications 1 à 6, comprenant en outre :
    une soupape (60) disposée dans le conduit d'alimentation en air (41) pour ouvrir et fermer sélectivement la voie d'écoulement d'alimentation en air (41-1).
  8. Outil à air selon la revendication 7, comprenant en outre :
    un élément de commande de soupape (66) s'étendant depuis l'extérieur du conduit d'alimentation en air (41) dans la voie d'écoulement d'alimentation en air (41-1), sans s'étendre à travers la voie d'écoulement d'échappement (42-1), et en prise avec la soupape (60) ;
    dans lequel la soupape (60) est ouverte et fermée sélectivement en actionnant l'élément de commande de soupape (66) de l'extérieur.
EP14818561.4A 2013-06-26 2014-06-25 Outil pneumatique Active EP3015225B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013133982 2013-06-26
PCT/JP2014/066815 WO2014208589A1 (fr) 2013-06-26 2014-06-25 Outil pneumatique

Publications (3)

Publication Number Publication Date
EP3015225A1 EP3015225A1 (fr) 2016-05-04
EP3015225A4 EP3015225A4 (fr) 2017-03-01
EP3015225B1 true EP3015225B1 (fr) 2018-10-17

Family

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Application Number Title Priority Date Filing Date
EP14818561.4A Active EP3015225B1 (fr) 2013-06-26 2014-06-25 Outil pneumatique

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EP (1) EP3015225B1 (fr)
JP (1) JP6185585B2 (fr)
KR (1) KR101921391B1 (fr)
CN (1) CN105307822B (fr)
TW (1) TWI568549B (fr)
WO (1) WO2014208589A1 (fr)

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DE112017001265B4 (de) * 2016-03-11 2024-04-25 Nitto Kohki Co., Ltd. Bandschleifwerkzeug

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JPH07314315A (ja) * 1994-05-27 1995-12-05 Uriyuu Seisaku Kk エアーモータの排気の温度低下防止機構
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JP2001138267A (ja) 1999-11-16 2001-05-22 Kuken:Kk エアツールにおける消音装置
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Also Published As

Publication number Publication date
WO2014208589A1 (fr) 2014-12-31
CN105307822A (zh) 2016-02-03
KR20160022891A (ko) 2016-03-02
JPWO2014208589A1 (ja) 2017-02-23
EP3015225A1 (fr) 2016-05-04
CN105307822B (zh) 2018-05-18
JP6185585B2 (ja) 2017-08-23
TWI568549B (zh) 2017-02-01
TW201524709A (zh) 2015-07-01
KR101921391B1 (ko) 2018-11-22
EP3015225A4 (fr) 2017-03-01

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