JP3771470B2 - Snow blower switch mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch mechanism of a snowplow that turns a switch member on and off with an operation lever.
[0002]
[Prior art]
As a switch mechanism of a snowplow, for example, (1) Japanese Patent Laid-Open No. 1-163304 “Load detection device of a snowplow” and (2) Japanese Patent Laid-Open No. 9-114535 “a cover structure of a switch provided in a lever device” are known. It has been.
According to FIG. 2 and FIG. 4 of the publication, the above-mentioned {circle over (1)} is arranged such that the shift lever 20 is slidably operated on the operation panel 4a (the reference numeral is the same as that used in the publication). A shift detection means 29 for detecting the lever position is provided on the side of 20 and this shift detection means 29 is provided with double switches SW1 to SW4 and a double switch SWR.
According to FIG. 1 of the same publication, the above-mentioned (2) is that a guide hole 36 is formed in the lever box 18, the travel lever 20a is inserted from the guide hole 36, the switch 38 is attached to the mounting piece 40, and the travel lever 20a The switch mechanism is configured to operate the switch 38, and is provided with a cover function that covers the operating portion of the switch 38 on the mounting piece 40.
[0003]
[Problems to be solved by the invention]
However, in the load detecting device for the snow remover of the above (1), since the double switches SW1 to SW4 and the double switch SWR of the shift detecting means 29 are exposed from the operation panel 4a, there is a possibility that snow or rain may be applied. is there.
Further, in the switch cover structure provided in the lever device of the above (2), the mounting piece 40 is provided with a cover function for covering the operating portion of the switch 38, and is a working machine used in an environment of freezing or snow. If you think about it, you want to cover the working part more actively.
[0004]
Accordingly, an object of the present invention is to provide a snow blower switch mechanism that can cope with an environment of freezing and snow accumulation.
[0005]
[Means for Solving the Problems]
To achieve the above object, the switch mechanism of the snowplow according to claim 1 has a bracket attached to the handle, a switch member attached to the bracket, and an operation lever for turning on and off the switch member attached to the handle in a swingable manner. In the snowplow, the bracket is formed in a substantially U shape in cross section, and the switch member operation element is projected from the opening in the bracket in cross section view, and the operation lever is provided with a pressing piece for pressing the operation element. The opening is closed with a pressing piece when the operating element is pressed.
[0006]
Since the snowplow is a work machine that is used in an environment of freezing or snow accumulation, the switch mechanism mounted on the snowplow needs to take care to prevent rain and snow.
Therefore, the bracket is formed in a substantially U shape in sectional view, and the switch member's operating element is projected from the opening in the bracket's sectional view in an approximately U shape, and the operating lever is provided with a pressing piece for pressing the operating element. By closing the opening with a pressing piece when pushing the child, rain and snow are prevented from adhering to the switch member. This improves the reliability of the switch mechanism and extends the life of the switch member.
[0007]
A second aspect of the present invention is characterized in that the on / off timing of the switch member is shifted by configuring the operating lever from a pressing piece for pressing the operating element and a lever main body for operating the pressing piece.
The operating lever is composed of a pressing piece that pushes the operating element and a lever body that operates the pressing piece, and the operation position of the operating lever can be set arbitrarily by shifting the on / off timing of the switch member. . As a result, the degree of freedom in designing the switch mechanism can be increased.
[0008]
According to a third aspect of the present invention, the opening also serves as a stopper function for stopping the operation lever at a predetermined angle.
By making the opening serve as a stopper function for stopping the operation lever at a predetermined angle, the number of components can be reduced. With this, the cost of the switch mechanism can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the operator, Fr is front, Rr is rear, L is left, R is right Indicates. The drawings are to be viewed in the direction of the reference numerals.
[0010]
FIG. 1 is a side view of a snowplow equipped with a switch mechanism according to the present invention. A snowplow 10 includes a snow removal work unit 13 and a snow removal work unit 13 on a traveling frame 12 having left and right crawler belts 11L and 11R. A vehicle body frame 15 having an engine 14 for driving the vehicle is attached so as to be able to swing up and down, and a front part of the vehicle body frame 15 is swung up and down by a frame lifting mechanism 16. The handles 17L and 17R are extended. Reference numerals 18L and 18R denote grips of the handles 17L and 17R.
[0011]
An operator can operate the snow remover 10 with the handles 17L and 17R while walking with the snow remover 10. In this example, the operation box 41, the control unit 28, and the batteries 29 and 29 (the back side 29 is not shown) are arranged in this order from the top between the left and right handles 17L and 17R.
[0012]
The snow remover 10 transmits power from the crankshaft 35 that is an output shaft of the engine 14 to the snow removal working unit 13 via the shaft-side pulley 36 and the transmission belts 37, 37. In this working machine, an electromagnetic clutch 50 is arranged at the tip of 35 and a shaft-side pulley 36 is arranged in the middle of the crankshaft 35.
[0013]
The snow removal working unit 13 includes an auger 31, a blower 32, and a shooter 33 that are attached to the front portion of the vehicle body frame 15, and is configured to rotate the auger 31 and the blower 32 around a rotation shaft 39.
Therefore, the power from the crankshaft 35 is transmitted to the shaft side pulley 36 via the electromagnetic clutch 50, and the rotation of the shaft side pulley 36 is transmitted to the auger side pulley 38 via the transmission belts 37, 37. By transmitting the rotation of 38 to the auger 31 and the blower 32 via the rotation shaft 39, the snow collected by the auger 31 can be blown far away via the shooter 33 by the blower 32.
[0014]
In the figure, 26a is an auger case, 26b is a blower case, 26c is a scraper, 26d is a generator for charging, 26e is a lamp, 26f is a cover, and 26g is a belt urging member. The traveling frame 12 and the vehicle body frame 15 constitute an airframe 19.
[0015]
FIG. 2 is a plan view of a snowplow equipped with a switch mechanism according to the present invention. The drive sources of the left and right crawler belts 11L and 11R are the left and right electric motors 21L and 21R, respectively, and the rear parts of the left and right crawler belts 11L and 11R are provided. Drive wheels 23L and 23R as left and right traveling wheels are disposed, and rolling wheels 24L and 24R as left and right traveling wheels are disposed in front of left and right crawler belts 11L and 11R.
Therefore, the rotation of the electric motors 21L and 21R can be transmitted to the left and right drive wheels 23L and 23R, respectively, and the left and right crawler belts 11L and 11R can be driven to run on their own.
[0016]
Further, the generator pulley 27a is attached to the crankshaft 35 protruding from the engine 14, and the V-belt 27c is applied to the generator-side pulley 27b attached to the charging generator 26d from the generator pulley 27a. The rotation of 35 can be transmitted to the charging generator 26d via the V-belt 27c.
[0017]
FIG. 3 is a perspective view of the operation unit 40 as viewed from the direction of arrow 3 in FIG.
The operation unit 40 includes an operation box 41 provided between the left and right handles 17L, 17R, a travel preparation lever 43 provided on the left handle 17L, a left turning operation lever 44L attached to the left handle 17L, And a right turning operation lever 44R attached to the handle 17R.
[0018]
The operation box 41 includes an operation case 45 handed over to the handles 17L and 17R and an operation panel 46 placed on the operation case 45.
The operation case 45 includes a clutch button 45A for switching the electromagnetic clutch 50 ON / OFF, a start switch 45B for starting the engine 14 (see FIG. 1), a choke knob 45C used for starting the engine 14, a lamp A lighting button 45D for lighting 26e (see FIG. 1) is provided.
The operation panel 46 includes an elevating operation lever 46A for operating the frame elevating mechanism 16 (see FIG. 1), a shooter operating lever 46B for changing the direction of the shooter 33, a throttle lever 46C for controlling the rotational speed of the engine 14, and the fuselage 19. An operating lever (forward / reverse speed adjusting lever) 76 that operates forward / backward by operating the traveling speed (see FIG. 1) and rotating the electric motors 21L, 21R forward and backward is provided.
[0019]
The travel preparation lever 43 is a lever that enables the snowplow 10 to travel.
The left and right turning operation levers 44L and 44R are levers for turning the aircraft to the left or right by changing the rotation speed of one of the two electric motors 21L and 21R (see FIG. 1). It is.
[0020]
FIG. 4 is a plan view of the operation panel of the snowplow equipped with the switch mechanism according to the present invention. The operation panel 46 includes a panel body 47a, a cover 47b that covers the travel preparation lever 43, and a lifting operation lever 46A. An oval through-hole 47c that penetrates, an oval-shaped through-hole 47d that penetrates the shooter operating lever 46B, a long hole 47f that penetrates the throttle lever 46C, a guide hole 48 that guides and penetrates the operating lever 76, Stop holes 47g and 47g for stopping the operation panel 46 are provided in the operation case 45.
[0021]
The guide hole 48 is a hole formed in a crank shape so that the operation lever 76 can be guided in the front-rear direction and the left-right direction. A1 is a forward travel range in which the machine body 19 (see FIG. 1) only travels forward, A2. Is a work travel range in which the airframe 19 is moved forward or backward during snow removal work, and A3 is a reverse travel range in which the airframe 19 only travels backward. The operation lever 76 is set in these ranges to perform forward, reverse or snow removal work. Do.
[0022]
Hereinafter, a detailed description will be given of a switch mechanism 80 (hereinafter abbreviated as “switch mechanism 80”) of the snowplow according to the present invention, which is a detailed structure of the travel preparation lever 43 (hereinafter referred to as “operation lever 43”).
[0023]
FIG. 5 is a side view of the switch mechanism of the snowplow according to the present invention. The switch mechanism 80 has a bracket 84 attached to the left handle 17L, and a switch member (travel preparation switch) 85 attached to the bracket 84. In the snowplow 10 (see FIG. 1) in which the operation lever 43 for turning on and off the member 85 is swingably attached to the handle 17L (see FIG. 1), the bracket 84 is formed in a substantially U shape in a sectional view. The operating element 85b of the switch member 85 is protruded from the opening 84c of the switch, and a pressing piece 89 for pressing the operating element 85b is provided on the operating lever 43. When the operating piece 85b is pressed by the pressing piece 89, the opening 84c is closed by the pressing piece 89. It is what I did.
[0024]
Since the snow removal machine 10 (see FIG. 1) is a working machine that is used in an environment of freezing or snow accumulation, the switch mechanism 80 mounted on the snow removal machine 10 needs to be considered to prevent rain and snow.
Therefore, the bracket 84 is formed in a substantially U shape in a sectional view, the operating element 85b of the switch member 85 is protruded from the opening 84c in a substantially U shape in the sectional view, and a pressing piece 89 that pushes the operating element 85b on the operating lever 43. When the operating piece 85b is pushed by the pressing piece 89, the opening 85c is closed by the pressing piece 89, thereby preventing rain and snow from adhering to the switch member 85. With this, the reliability of the switch mechanism 80 is improved and the life of the switch member 85 is extended.
[0025]
FIG. 6 is an exploded perspective view of the switch structure of the snowplow according to the present invention.
The bracket 84 is a U-shaped member in cross-sectional view, and has mounting holes 84a and 84a for attaching the switch member 85, support portions 84b and 84b for supporting the operation lever 43, and an opening 84c for projecting the operation element 85b of the switch member 85. Is formed. The opening 84c also serves as a stopper function for stopping the operation lever 43 at a predetermined angle. By making the opening 84c also serve as a stopper function for stopping the operation lever 43 at a predetermined angle, the number of components can be reduced. As a result, the cost of the switch mechanism 80 can be reduced.
[0026]
The switch member 85 includes a switch body 85a, an operation element 85b slidably attached to the switch body 85a, and a harness 85c extending from the switch body 85a. Reference numeral 86 denotes a mounting screw for attaching the switch member 85 to the bracket 84, and 86a denotes a nut to be screwed into the mounting screw 86.
[0027]
The operation lever 43 includes a lever main body 87 operated by an operator, a pressing piece 89 rotatably attached to the bracket 84 via the pin 88 together with the lever main body 87, and a space between the lever main body 87 and the pressing piece 89. And a tension spring 92 spanned between the lever main body 87 and the left handle 17L. In addition, 88a is a retaining ring for stopping the pin, and 92a is a spring hooking portion for hooking a tension spring 92 formed on the handle 17 side.
[0028]
The lever body 87 is a U-shaped lever in cross section, and includes holes 87 a and 87 a for supporting the bracket 84, a hook portion 87 b for hooking the tension spring 92, and an operating portion 87 c for operating the pressing piece 89.
The pressing piece 89 is a U-shaped holder and includes holes 89a and 89a that are rotatably mounted on the bracket 84 by the pin 88 together with the lever main body 87, and a flat portion 89b that presses the operating element 85b and covers the opening 84c. Prepare.
The torsion spring 91 is supported by penetrating the coil portion 91a with a pin 88, and one end is applied to the flat portion 89b of the pressing piece 89 and the other end is applied to the left handle 17L.
[0029]
Hereinafter, the basic operation of the switch mechanism 80 will be described.
7A to 7C are operation explanatory views of the switch mechanism of the snowplow according to the present invention.
(A) shows a state in which the operating element 85b of the switch member 85 is pressed by the pressing piece 89 of the operating lever 43. The operating lever 43 is in contact with the opening 84c of the bracket 84 in the order of the pressing piece 89 and the lever main body 87. It shows that the steady state was maintained.
The switch member 85 is a switch that is set to the OFF state when the operating element 85b is pushed into the switch body 85a. That is, as described with reference to FIG. 3, the operation lever 43 is a lever that enables the electric motors 21 </ b> L and 21 </ b> R (see FIG. 1) to travel.
[0030]
In (b), the operation lever 43 is gripped as shown by an arrow b. In this state, the operating portion 87 c of the lever main body 87 does not contact the flat portion 89 b of the pressing piece 89. Accordingly, the state of the switch member 85 remains OFF.
[0031]
In (c), by further grasping the operating lever 43 as shown by the arrow c1 and bringing the operating lever 43 closer to the grip 18L, the operating portion 87c of the lever main body 87 lifts the flat portion 89b of the pressing piece 89, and the pressing piece 89 is moved. The pressing piece 89 is removed from the operating element 85b by rotating as shown by the arrow c2. That is, the switch member 85 changes from the OFF state to the ON state. In this state (the switch member 85 is ON), the electric motors 21L and 21R (see FIG. 1) can rotate.
[0032]
That is, the switch mechanism 80 includes the pressing piece 89 that presses the operating element 85 b and the lever main body 87 that operates the pressing piece 89, thereby shifting the on / off timing of the switch member 85. Show that you can.
The operating lever 43 includes a pressing piece 89 that presses the operating element 85b and a lever main body 87 that operates the pressing piece 89. By shifting the on / off timing of the switch member 85, the operating position of the operating lever 43 is changed. Can be set arbitrarily. As a result, the degree of freedom in designing the switch mechanism 80 can be increased.
[0033]
FIG. 8 is a side view of the switch mechanism of the snowplow according to the second embodiment of the present invention. The same parts as those used for the switch mechanism 80 (see FIG. 5) are denoted by the same reference numerals and detailed description thereof is omitted. To do.
In the figure, 17L is a left handle, 18L is a left grip, 47b is a cover portion of the operation panel 46 (see FIG. 5), 84 is a bracket, 85 is a switch member, 86 is a mounting screw, 86a is a nut, and 88 is a pin. , 91 is a torsion spring, and 92 is a tension spring. A switch mechanism 81 (hereinafter abbreviated as “switch mechanism 81”) of the snowplow includes a pressing piece 94 that pushes an operating lever (running preparation lever) 93 against an operating element 85b. The action portion 94a of the pressing piece 94 is composed of a lever main body 95 that encloses, and the action portion 94a is pushed by the belly 95a of the lever main body 95. As a result, the switch mechanism 81 can be made compact.
[0034]
FIG. 9 is a side view of the switch mechanism of the snowplow according to the third embodiment of the present invention. The same parts as those used for the switch mechanism (see FIG. 5) are denoted by the same reference numerals and detailed description thereof is omitted. To do.
In the figure, 17L is a left handle, 18L is a left grip, 47b is a cover portion of the operation panel 46 (see FIG. 5), 84 is a bracket, 85 is a switch member, 86 is a mounting screw, 86a is a nut, and 88 is a pin. , 92 are tension springs, and 92b is a spring hooking portion for hooking the tension spring 92 formed on the handle 17 side. A switch mechanism 82 (hereinafter abbreviated as “switch mechanism 82”) of the snowplow is an operation lever (travel preparation lever). ) 96 is integrally formed. That is, 96a is a pressing piece that presses the operating element 85b of the switch member 85 and covers the opening 84c, and the number of parts can be reduced. As a result, the cost of the switch mechanism 82 can be reduced.
[0035]
In the embodiment, as shown in FIG. 5, the front portion of the operation element 85b of the switch member 85 is closed, but the present invention is not limited to this, and the pressing piece 89 is flat so as to cover the entire opening 84c. The area of the portion 89b may be increased.
[0036]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
Since the snowplow is a work machine that is used in an environment of freezing or snow accumulation, the switch mechanism mounted on the snowplow needs to take care to prevent rain and snow.
According to the first aspect of the present invention, the bracket is formed in a substantially U shape in cross section, and the operation member of the switch member is projected from the opening of the bracket in the cross section view, and a pressing piece for pressing the operation member is provided on the operation lever. Since the opening is closed with the pressing piece when the operator is pushed with the piece, it is possible to prevent rain and snow from adhering to the switch member. As a result, the reliability of the switch mechanism can be improved and the life of the switch member can be extended.
[0037]
According to the second aspect of the present invention, the operating lever is composed of a pressing piece for pressing the operating element and a lever main body for operating the pressing piece, and the on / off timing of the switch member is shifted. It can be set arbitrarily. As a result, the degree of freedom in designing the switch mechanism can be increased.
[0038]
According to the third aspect of the present invention, since the opening also serves as a stopper function for stopping the operation lever at a predetermined angle, the number of components can be reduced. As a result, the cost of the switch mechanism can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a snow remover equipped with a switch mechanism according to the present invention. FIG. 2 is a plan view of a snow remover equipped with a switch mechanism according to the present invention. FIG. 5 is a side view of the switch mechanism of the snowplow according to the present invention. FIG. 6 is an exploded perspective view of the switch structure of the snowplow according to the present invention. FIG. 7 is a diagram for explaining the operation of the switch mechanism of the snowplow according to the present invention. FIG. 8 is a side view of the switch mechanism of the snowplow according to the second embodiment of the present invention. Side view of switch mechanism of snowplow according to embodiment
DESCRIPTION OF SYMBOLS 10 ... Snow remover, 17L ... Handle, 43, 93, 96 ... Operation lever (travel preparation lever), 80, 81, 82 ... Switch mechanism, 84 ... Bracket, 84c ... Opening, 85 ... Switch member (travel preparation switch), 85b ... Operator, 87, 95 ... Lever body, 89, 94, 96a ... Pressing piece.

Claims (3)

In a snowplow with a bracket attached to the handle, a switch member attached to this bracket, and an operation lever for turning this switch member on and off attached to the handle in a swingable manner,
The bracket is formed in a substantially U shape in a cross-sectional view, and an operating piece of the switch member is protruded from an opening of the bracket in a substantially U shape in a cross-sectional view, and a pressing piece for pressing the operating element is provided on the operating lever. A switch mechanism for a snowplow that closes the opening with the pressing piece when the operating element is pressed. 2. The on / off timing of the switch member is shifted by configuring the operating lever from a pressing piece for pressing the operating element and a lever main body for operating the pressing piece. Snow blower switch mechanism. The snow opening machine switch mechanism according to claim 1, wherein the opening also serves as a stopper function for stopping the operation lever at a predetermined angle.

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