JP2017048772A - Backpack type blow work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the output of an engine unchanged with respect to an operation amount (pulling margin) of a throttle lever provided at a grip, even when the grip provided at a vent pipe of a backpack type blow work machine is mounted in a manner movable in the longer direction.SOLUTION: A backpack type blow work machine 10 includes: a vent pipe 30 communicated and connected to an air duct 21a for passing the air of a blower unit 20 mounted on a backpack frame 11; a grip 34 mounted on the vent pipe 30 in a manner adjustable in the longer direction; a throttle lever 35 provided at the grip 34; and a throttle wire 41 for transmitting an operation of the throttle lever 35 to a throttle valve 23b. The vent pipe 30 has a throttle rod 42 which extends in the longer direction, which is supported movably, and in which the other end of the throttle wire 41 is fixed, and a first transmission mechanism 44 which transmits the operation of the throttle lever 35 as movement in the longer direction of the throttle rod 42. The first transmission mechanism 44 is mounted in a manner movable in the longer direction of the throttle rod 42.SELECTED DRAWING: Figure 2

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back blower and a back blower used for cleaning work such as fallen leaves on the back of an operator, and particularly to a back blower working machine such as a back dust collector, in particular, in a longitudinal direction on a ventilation pipe through which air passes a grip gripped by the operator. The present invention relates to a back-fitted blower that is movably attached.

  Patent Document 1 discloses a backpack-type blower. The backpack-type blower is mounted on a backpack frame carried by an operator, and a blower that blows air sucked by rotation of a fan driven by an engine. A unit, a blower pipe connected in communication with a jet duct for jetting air from the blower unit, and a grip held by an operator attached to the blower pipe are provided. The grip is provided with a throttle lever for adjusting the engine output by adjusting the opening of the throttle valve of the engine, and the throttle lever is connected to the throttle valve of the engine by a throttle wire. When the throttle lever is operated, the throttle wire is pulled by a length corresponding to the operation amount of the throttle lever, the engine throttle valve is opened at an opening according to the pulled length of the throttle wire, and the engine Drives with an output according to the opening. When the fan is rotated by driving the engine, air is blown out from the blowout duct, and the air blown out from the blowout duct is guided to the ground etc. by the blower pipe, and the fallen leaves scattered widely on the ground in front of the operator Blowed up.

Japanese Patent Laying-Open No. 2015-083818

  In the backpack type blower of Patent Document 1, an operator carrying a backpack frame grips and uses a grip attached to the blower pipe, but the grip is arranged in the longitudinal direction of the blower pipe according to the physique of the worker. If it is attached so as to be movable, the operator can grip the grip at a position according to his / her physique. However, assuming that the length of the throttle wire is assumed to be a grip attached to the distal end side of the blower pipe, when the grip is attached to the proximal end side of the blower pipe, the throttle wire loosens and the allowance of the throttle lever There was a problem that the engine output changed with respect to the pulling amount of the throttle lever. The present invention prevents the engine output from changing with respect to the operation amount (pulling allowance) of the throttle lever provided on the grip even when the grip provided on the ventilation pipe of the back-type air blower is movably attached in the longitudinal direction. For the purpose.

  In order to solve the above-described problems, the present invention provides a back frame carried by an operator, a blower unit mounted on the back frame and ejecting air sucked by rotation of a fan driven by an engine, and air of the blower unit A ventilation pipe that is connected to a ventilation duct through which the air passes, a grip that is attached to the ventilation pipe so that the position of the ventilation pipe can be adjusted in the longitudinal direction, and a throttle that is provided on the grip and adjusts the opening of the throttle valve of the engine. A blower with a lever and one end connected to the throttle valve of the engine, and a throttle wire that transmits the operation of the throttle lever to the throttle valve. It extends in the longitudinal direction of the ventilation pipe and is movable And a throttle rod fixed to the other end of the throttle wire and a throttle lever. The first transmission mechanism is connected to the rottle rod and transmits the operation of the throttle lever as a movement in the longitudinal direction of the throttle rod, and the first transmission mechanism is attached so as to be movable in the longitudinal direction of the throttle rod. A backpack type blower working machine is provided.

  In the back-type blower working machine configured as described above, when the throttle lever is operated, the throttle rod is moved in the longitudinal direction by the movement amount corresponding to the operation amount of the throttle lever by the first transmission mechanism, and the longitudinal direction of the throttle rod The throttle wire is pulled according to the amount of movement of the engine, the throttle valve of the engine is opened with an opening according to the amount of operation of the throttle lever, and the engine is driven with an output according to the opening of the throttle valve. When the grip is moved in the longitudinal direction of the air duct, the throttle wire does not loosen regardless of the position of the grip by attaching the first transmission mechanism to the throttle rod in the longitudinal direction along with the grip. Become. As a result, regardless of the position of the grip, the throttle wire can be pulled constant according to the operation amount of the throttle lever, and the engine output with respect to the operation amount of the throttle lever can be made constant.

  In the back-floor type blower working machine configured as described above, the throttle rod is supported by the ventilation pipe so as to be rotatable in the circumferential direction thereof, the stop switch for stopping the driving of the engine by the ventilation pipe, and the throttle rod A pushing member that is attached and pushes the stop switch when the throttle rod is rotated; a stop lever that is provided on the grip and operates to stop driving the engine; a stop lever and a throttle rod; And a second transmission mechanism that rotates the throttle rod by operating a stop lever, and the second transmission mechanism is preferably attached to be movable in the longitudinal direction of the throttle rod. When the stop lever is operated, the throttle rod is rotated by the second transmission mechanism, the pushing member pushes the stop switch by turning the throttle rod, and the engine is stopped by pushing the stop switch. When the grip is moved in the longitudinal direction of the ventilation pipe, the driving of the engine can be stopped by operating the stop lever by attaching the second transmission mechanism to the throttle rod in the longitudinal direction together with the grip. As a result, the drive of the engine can be stopped by operating the stop lever regardless of the position of the grip.

It is a side view of a backpack type blower which is one embodiment of the present invention. FIG. 2 is a schematic diagram of a mechanism for transmitting an operation of a throttle lever to an opening / closing operation of a throttle valve, and is a schematic diagram when the throttle lever is not operated and a schematic diagram when the throttle lever is operated. It is sectional drawing of the AA line of FIG. It is sectional drawing of the BB line of FIG. It is the schematic of the mechanism which transmits operation of a throttle lever to the opening / closing operation | movement of a throttle valve, and is the schematic (a) before moving a grip, and the schematic (b) after moving a grip. It is a side view of the backpack type dust collector which is other embodiments of the present invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS A backpack type blower that is an embodiment of a backpack type blower working machine of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the back blower 10 has a back frame 11 carried by an operator, and air sucked by rotation of a centrifugal fan (fan) 22 mounted on the back frame 11 and driven by an engine 23. A blower unit 20 to be ejected, and a blower pipe (ventilation pipe) 30 connected to an ejection duct (ventilation duct) for ejecting (passing) air of the blower unit 20 are provided.

  As shown in FIG. 1, the back frame 11 is for an operator to carry the blower unit 20 on the back. The back frame 11 is composed of a back plate portion 12 arranged along the operator's back and a pedestal portion 13 extending rearward from the lower end of the back plate portion 12, and the shape seen from the side surface is L-shaped. .

  The blower unit 20 includes a volute 21 mounted on the back frame 11, a centrifugal fan 22 rotatably provided in the volute 21, and an engine (prime mover) 23 that rotates the centrifugal fan 22. The volute 21 includes an intake port for sucking air on the front side, and a cylindrical jet duct 21a for jetting air sucked on the right side. A centrifugal fan 22 is provided in the volute 21, an engine 23 is integrally assembled on the rear side of the volute 21, and the centrifugal fan 22 is fixed to the drive shaft of the engine 23 in the volute 21. As shown in FIG. 2, the carburetor 23a of the engine 23 is provided with a throttle valve 23b, and the output of the engine (the rotational speed of the drive shaft) is adjusted by adjusting the opening of the throttle valve 23b. When the centrifugal fan 22 is rotated by driving the engine 23, air is sucked in from the intake port on the front side of the volute 21, and the sucked air is ejected from the ejection duct 21a.

  A blower pipe (ventilation pipe) 30 is connected to the ejection duct 21 a of the volute 21. The blower pipe 30 includes an elbow pipe 31 rotatably connected to the ejection duct 21 a, a bellows-like flexible pipe 32 connected to the elbow pipe 31, and a straight pipe 33 connected to the flexible pipe 32. . The straight pipe 33 is provided with a grip 34 held by an operator, and the grip (grip handle) 34 is attached to be movable in the longitudinal direction (axial direction) of the straight pipe 33. As shown in FIG. 2, the straight pipe 33 is formed with a concave groove 33a along the longitudinal direction for supporting a throttle rod 42, which will be described later, so as to be movable along the longitudinal direction (axial direction).

  As shown in FIG. 2, the grip 34 is provided with a throttle lever 35 for adjusting the output of the engine 23 and a stop lever 36 for stopping the driving of the engine 23 (driving in the idling state). The throttle lever 35 is a trigger type operation lever, and a pivot shaft 35a at the upper end is supported by the grip 34 so as to be pivotable about a horizontal axis in the left-right direction. An arm portion 35b extending rearward is provided at the upper end portion of the throttle lever 35, and the arm portion 35b moves up and down by rotating around the rotation shaft portion 35a of the throttle lever 35. A biasing member 37 made of a coil spring that biases the lower end portion of the throttle lever 35 away from the grip 34 is provided in the grip 34. As shown in FIG. 2B, when the lower end portion of the throttle lever 35 is moved toward the grip 34 against the urging force of the urging member 37, the arm portion 35b moves upward with the rotation shaft portion 35a as the center. The throttle valve 23b of the engine 23 is opened, and the output of the engine 23 is increased.

  The stop lever 36 is used to stop the driving of the engine 23. The front end portion of the stop lever 36 is supported so as to be rotatable around a horizontal axis in the left-right direction, and the rear end portion of the stop lever 36 projects rearward from the grip 34. When the rear end portion of the stop lever 36 is rotated upward, the stop switch 45 for stopping the driving of the engine 23 is turned on, and the driving of the engine 23 is stopped.

  As shown in FIG. 2, a throttle wire 41, a throttle rod 42, and a first transmission mechanism 44 are provided between the throttle valve 23 b and the throttle lever 35 of the engine 23. One end of the throttle wire 41 is connected to the throttle valve 23b, and the throttle valve 23b is opened according to the length of the throttle wire 41. The other end of the throttle wire 41 is connected to the base end (one end) of the throttle rod 42. The throttle rod 42 is supported in a groove 33a formed in the straight pipe 33 of the blower pipe 30 so as to be movable in the longitudinal direction and rotatable in the circumferential direction. A coil spring (biasing member) 43 is provided at the distal end side (the distal end side of the blower tube 30) of the concave groove 33a, and the throttle rod 42 is attached to the proximal end side (one end side) to which the throttle wire 41 is connected. It is energized.

  The first transmission mechanism 44 transmits the operation of the throttle lever 35 as the movement of the throttle rod 42 in the longitudinal direction. The first transmission mechanism 44 includes a first link wire 44a connected to the arm portion 35b of the throttle lever 35, a joint 44b attached to the throttle rod 42, and an L-shaped link connecting the first link wire 44a and the joint 44b. 44c.

  As shown in FIG. 2, the first link wire 44a extends vertically in the grip 34, the upper end of the first link wire 44a is connected to the arm portion 35b of the throttle lever 35, and the lower end of the first link wire 44a. Is connected to the link 44c. When the throttle lever 35 is pulled toward the grip 34, the arm portion 35b of the throttle lever 35 rotates upward (upward movement) about the rotation shaft portion 35a, and the first link wire 44a rotates upward (upward movement). ) To move up together with the arm portion 35b.

  As shown in FIG. 3, the joint 44b is provided with a substantially n-shaped fixing portion 44b1 which is opened downward so as to sandwich the throttle rod 42 by processing a sheet metal member. The fixing portion 44b1 is throttled by a grind screw 44b2. Fastened to 42. The fixing portion 44b1 of the joint 44b can be moved in the longitudinal direction of the throttle rod 42 by loosening the thumbscrew 44b2. As shown in FIG. 2, a connecting piece 44b3 extends above the fixed portion 44b1, and a link 44c is connected to the connecting piece 44b3. The connecting piece 44b3 is bent so as to spread outward.

  As shown in FIG. 2, the link 44c includes a first arm portion 44c1 extending in the front-rear direction and a second arm portion 44c2 extending downward from the rear end of the first arm portion 44c1. The link 44c is pivotally supported by the grip 34 so that a rotation shaft portion 44c3 provided at a position where the first and second arm portions 44c1 and 44c2 intersect with each other. The lower end of the first link wire 44a is connected to the front end portion of the first arm portion 44c1, and the connecting piece portion 44b3 of the joint 44b is connected to the lower end portion of the second arm portion 44c2.

  A mechanism for transmitting the operation of the throttle lever 35 by the first transmission mechanism 44 to the movement of the throttle rod 42 in the longitudinal direction will be described. As shown in FIG. 2B, when the throttle lever 35 is pulled toward the grip 34, the arm portion 35 b of the throttle lever 35 rotates upward (moves upward), and the first link wire of the first transmission mechanism 44. 44a moves upward together with the arm portion 35b. When the first link wire 44a moves upward, the first arm portion 44c1 of the link 44c rotates upward with the rotation shaft portion 44c3 as a fulcrum, and the lower end portion of the second arm portion 44c2 uses the rotation shaft portion 44c3 as a fulcrum. Rotate forward (forward). When the lower end portion of the second arm portion 44c2 of the link 44c rotates to the front side, the joint 44b and the throttle rod 42 attached with the joint 44b move to the front side in the longitudinal direction. When the throttle rod 42 moves forward in the longitudinal direction, the throttle wire 41 is pulled, the throttle valve 23b of the engine 23 is opened by the throttle wire 41, and the engine 23 is driven with an output corresponding to the opening degree of the throttle valve 23b. To do.

  As shown in FIG. 2, between the engine 23 and the stop lever 36, a stop switch 45 that stops the engine 23, a pushing member 46 that pushes the stop switch 45, and the pushing member 46 rotates. A throttle rod 42 to be moved and a second transmission mechanism 47 are provided. The stop switch 45 is provided in the vicinity of the base end portion of the throttle rod 42 at the base end portion of the straight pipe 33 of the blower tube 30, and is electrically connected to the spark plug 23 c of the engine 23. The stop switch 45 stops the drive of the engine 23 by stopping the power supply to the spark plug 23c by being pushed.

  The pushing member 46 pushes the stop switch 45. As shown in FIG. 4, the pushing member 46 has a fixing portion 46a fixed to the base end portion of the throttle rod 42, and an operation piece portion 46b extending from the upper edge of the fixing portion 46a to the upper side of the stop switch 45. It consists of an L-shaped sheet metal member. When the throttle rod 42 is rotated in the circumferential direction, the operation piece 46b of the pressing member 46 is rotated downward to push the stop switch 45.

  The second transmission mechanism 47 transmits the operation of the stop lever 36 as the rotation of the throttle rod 42. The second transmission mechanism 47 includes a second link wire 47 a connected to the stop lever 36 and a joint 44 b attached to the throttle rod 42. The second link wire 47 a extends in the vertical direction within the grip 34, and the upper end of the second link wire 47 a is connected to an intermediate portion in the front-rear direction of the stop lever 36. As shown in FIG. 3, the lower end portion of the second link wire 47a is a bulging portion 47a1 bent into a substantially circular shape so as to bulge toward the connecting piece portion 44b3 of the joint 44b, and the bulging portion 47a1 It is locked to the connecting piece 44b3.

  A mechanism for transmitting the operation of the stop lever 36 by the second transmission mechanism 47 to the rotation of the throttle rod 42 will be described. When the stop lever 36 is turned upward, the second link wire 47a moves upward together with the stop lever 36. As shown in FIG. 3, when the second link wire 47a moves upward, the bulging portion 47a1 at the lower end of the second link wire 47a pushes the connecting piece portion 47b2 of the joint 44b, and the throttle rod 42 to which the joint 44b is attached. Rotates in the circumferential direction. When the throttle rod 42 is rotated, the pushing member 46 at the base end portion of the throttle rod 42 is also turned, and the operation piece 46 b of the pushing member 46 pushes the stop switch 45. When the stop switch 45 is pushed, the power supply to the spark plug 23c of the engine 23 is stopped, and the drive of the engine 23 is stopped.

  The operation of the backpack type blower 10 configured as described above will be described. 2A and 2B, the operator pulls the throttle lever 35 toward the grip 34 with the index finger of the right hand holding the grip 34, as shown in FIGS. The transmission mechanism 44 moves to the front side according to the operation amount (pulling allowance) of the throttle lever 35, the throttle wire 41 is pulled according to the movement amount of the throttle rod 42 to the front side, and the throttle valve 23b of the engine 23 is The engine 23 is opened according to the length pulled by the engine 41, and the engine 23 rotates the drive shaft at an output corresponding to the opening of the throttle valve 23b. The centrifugal fan 22 is rotated by the drive of the engine 23, the air sucked from the intake port on the front side of the volute 21 is ejected from the ejection duct 21a, and the air ejected from the ejection duct 21a is ejected to the ground through the blower pipe 30. It is. By rotating the grip 34 gripped in the left-right direction, the operator can blow down fallen leaves scattered over a wide area on the ground on the front side of the operator. When the work using the back blower 10 is finished, when the operator turns the stop lever 36 of the grip 34 upward, the throttle rod 42 is turned in the circumferential direction by the second transmission mechanism 47 and stopped. The switch 45 is pushed by a pushing member 46 that rotates together with the throttle rod 42, and the engine 23 stops driving when power supply to the spark plug 23c is stopped.

  In this back blower 10, the grip 34 may be used by changing its position in the longitudinal direction in the straight pipe 33 of the blower pipe 30 according to the physique of the operator. As shown in FIGS. 5A and 5B, when the grip 34 is moved in the longitudinal direction of the straight pipe 33, the kneading screw 44 b 2 of the joint 44 b is loosened, and the joint 44 b is moved to move the grip 34. Accordingly, the joint 44b is fixed to the throttle rod 42 again by moving in the longitudinal direction of the throttle rod 42 and tightening the grind screw 44b2. As described above, when the grip 34 is moved in the longitudinal direction of the straight pipe 33, the joint 44b constituting the first transmission mechanism 44 is moved together with the grip 34 in the longitudinal direction to be attached to the throttle rod 42. The throttle wire 41 is not loosened regardless of the position of the grip 34. As a result, regardless of the position of the grip 34, the throttle wire 41 can be pulled constantly according to the operation amount of the throttle lever 35, and the output of the engine 23 with respect to the operation amount of the throttle lever 35 can be made constant. .

  Further, when the grip 34 is moved in the longitudinal direction of the straight pipe 33, the joint 44b that also constitutes the second transmission mechanism 47 is moved and attached to the throttle rod 42 along with the grip 34 in the longitudinal direction. The drive of the engine 23 can be stopped by operating the stop lever 36 regardless of the position 34.

  The above-described back blower 10 is one embodiment of a back blower working machine, but the present invention is not limited to this, and as shown in FIG. 6, as another embodiment of a back blower working machine. It is also applicable to a backpack type dust collector. The back dust collector 10 includes a back frame 11 carried by an operator, a blower unit 20 that is mounted on the back frame 11 and sucks air by rotation of a centrifugal fan (fan) 22 driven by an engine 23, and a blower unit 20. A suction pipe (ventilation pipe) 30 (31 to 33) connected to an intake duct (ventilation duct) 21a for sucking the air of the air, and a grip 34 attached to the suction pipe 30 so that the position of the suction pipe 30 can be adjusted in its longitudinal direction. Provided on the grip 34, a throttle lever 35 for adjusting the opening of the throttle valve 23b of the engine 23 (not shown in FIG. 6 since it is the same as FIG. 2) and one end are connected to the throttle valve 23b of the engine 23, Throttle wire 41 for transmitting the operation of the throttle lever 35 to the throttle valve (similar to FIG. 2) In and a omitted) and.

  In this backpack type dust collector 10 as well, the suction pipe 30 (which is the same as the blower pipe 30 and will not be described in detail) is extended in the longitudinal direction and moved in the longitudinal direction in the same manner as the backpack type blower 10 described above. The throttle rod 42 is supported in such a manner that the other end of the throttle wire 41 is fixed (similar to FIG. 2 and thus omitted in FIG. 6), and is connected to the throttle lever 35 and the throttle rod 42. Is provided as a movement in the longitudinal direction of the throttle rod 42 (similar to FIG. 2 and is omitted in FIG. 6) so that the first transmission mechanism 44 can be moved in the longitudinal direction of the throttle rod 42. It is attached. The throttle rod 42 is rotatably supported by the suction pipe 30 in the circumferential direction, and the suction pipe 30 has a stop switch 45 for stopping the drive of the engine 23 (similar to FIG. 2 and omitted in FIG. 6). A pushing member 46 attached to the throttle rod 42 to push the stop switch 45 when the throttle rod 42 is rotated (similar to FIG. 2 and omitted in FIG. 6), and provided on the grip 34. The second transmission mechanism 47 is connected to the stop lever 36 and the throttle rod 42 and rotates the throttle rod 42 by the operation of the stop lever 36. (Since it is similar to FIG. 2 and omitted in FIG. 6), the second transmission mechanism 47 is mounted to be movable in the longitudinal direction of the throttle rod 42 I have to so that. Even when this is done, the throttle wire 41 can be pulled uniformly according to the amount of operation of the throttle lever 35, regardless of the mounting position of the straight pipe 33 of the grip 34, as with the above-described back blower 10. Further, the output of the engine 23 with respect to the operation amount of the throttle lever 35 can be made constant, and the driving of the engine 23 can be similarly stopped by the operation of the stop lever 36.

  If the throttle rod 42 is made of a non-conductive material, it is possible to prevent the static electricity generated in the engine or the like from propagating to the grip.

DESCRIPTION OF SYMBOLS 10 ... Backpack type air blower (backpack type blower), 11 ... Backpack frame, 20 ... Blower unit, 21a ... Ventilation duct (jet duct, suction duct), 22 ... Fan (centrifugal fan), 23 ... Engine, 30 ... Ventilation Pipe (blower pipe, suction pipe), 34 ... grip, 35 ... throttle valve, 36 ... stop lever.

Claims (2)

A backpack frame carried by the operator,
A blower unit that is mounted on the backpack frame and blows out air sucked by rotation of a fan driven by an engine;
A ventilation pipe connected in communication with a ventilation duct through which the air of the blower unit passes;
A grip attached to the ventilation pipe in such a manner that its position can be adjusted in the longitudinal direction;
A throttle lever provided on the grip for adjusting an opening of a throttle valve of the engine;
A blow working machine having one end connected to a throttle valve of the engine and a throttle wire for transmitting an operation of the throttle lever to the throttle valve;
A throttle rod that extends in the longitudinal direction of the ventilation pipe and is supported so as to be movable in the longitudinal direction, and the other end of the throttle wire is fixed;
A first transmission mechanism that is connected to the throttle lever and the throttle rod and transmits an operation of the throttle lever as a movement in a longitudinal direction of the throttle rod;
A backpack type blower working machine, wherein the first transmission mechanism is attached to be movable in the longitudinal direction of the throttle rod. The blower working machine according to claim 1,
The throttle rod is supported by the ventilation pipe so as to be rotatable in its circumferential direction,
A stop switch for stopping the driving of the engine in the ventilation pipe;
A pushing member attached to the throttle rod for pushing the stop switch when the throttle rod is rotated;
A stop lever provided on the grip and operated to stop driving of the engine;
A second transmission mechanism connected to the stop lever and the throttle rod to rotate the throttle rod by operating the stop lever;
A backpack type blower working machine, wherein the second transmission mechanism is attached to be movable in the longitudinal direction of the throttle rod.

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