CN1786357A - Electric control system - Google Patents
Electric control system Download PDFInfo
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- CN1786357A CN1786357A CN 200510127949 CN200510127949A CN1786357A CN 1786357 A CN1786357 A CN 1786357A CN 200510127949 CN200510127949 CN 200510127949 CN 200510127949 A CN200510127949 A CN 200510127949A CN 1786357 A CN1786357 A CN 1786357A
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- helical spring
- current potential
- turned round
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Abstract
The invention provides an electric operating device which is equipped with a torsion coil spring that holds a turnable arm provided to a rotary potentiometer at a neutral position, and capable of returning the turnable arm to its original neutral position without fail. In the electric operating device, the rotary potentiometer 11 is provided with a turning arm 14 that is integrally provided with a rotary shaft 13 in one piece and turns corresponding to the swing operation of a control lever 2 in a certain direction or a reverse direction, the torsion coil spring 21 holding the turning arm 14 at a neutral position, a pin 19 which is provided to the turning arm 14 to extend the torsion coil spring 21 when the turning arm 14 is turned, a holding shaft 20 which holds the coil unit 21c of the torsion coil spring 21, and a cover member 22 provided with a pair of guide units 22a and 22b which control the movement of the coil unit 21c of the torsion coil spring 21 at a neutral position in the above certain direction and the reverse direction.
Description
Technical field
The present invention relates to the electric control system that is equipped with on hydraulic crawler excavator etc., it has: rotary current potential meter, this potentiometer possess by what the operator operated to be operated the cursor that rotates and makes this cursor remain on the helical spring of being turned round of neutral position with shaking of functional unit.
Background technology
As this original technology, known have a technology shown in the patent documentation 1 (spy opens the 2003-157122 communique).Original technology shown in this patent documentation 1 possesses rotary current potential meter, and it possesses: utilize the operator to a fixed direction or with this a fixed side shake the functional unit of operation, i.e. action bars in the opposite direction; The swing part that universal joint of following shaking of this action bars and shaking and cam are formed; Support the back shaft of this swing part, simultaneously, have the turning cylinder of following shaking of swing part and rotating, the corresponding angle of rotation signal of rotation of output and this axis of rotation.
In addition, also possess: be wholely set the extension arm that extends setting on back shaft, to rotary current potential meter direction; With the parallel plane vertical plane of the pivot region that comprises this extension arm in be connected with this extension arm rotationally, simultaneously, be wholely set the cursor on the turning cylinder of rotary current potential meter; This cursor and described extension arm with respect to action bars operation described decide direction and opposite direction thereof pass through the link rod part that couples together of fixed gap.
Have again, also possess the helical spring of being turned round of the cursor that keeps rotary current potential meter in the neutral position; Be provided with on the cursor, when cursor rotates, make and turned round the open portion of opening of helical spring, the i.e. block of overshooting shape; The retainer shaft that on the main body of rotary current potential meter, is provided with, keep being turned round helical spring spire.
At this, there is not bright note in the described patent documentation 1, the relation of utilizing Figure 12 that the described maintenance of being turned round helical spring spire and being provided with on rotary current potential meter is turned round between the helical spring retainer shaft describes.
In this Figure 12, show the retainer shaft 30 that on rotary current potential meter, is provided with, turned round helical spring 21 what this retainer shaft 30 maintained spire 21c, the turning cylinder 13 of rotary current potential meter, what be provided with on rotary current potential meter can link up the arm 21a of setting, the block 18 that 21b contacts with the spire 21c that is turned round helical spring 21 respectively, what form on the not shown cursor that goes out that is wholely set with turning cylinder 13 opens the portion of opening of being turned round helical spring 21, and promptly bolt 19.Bolt 19 is equivalent to the block that the formation shown in the described patent documentation 1 is opened the overshooting shape of portion.
Shown in (a) figure of this Figure 12 is the state of being turned round helical spring 21 of action bars when being maintained at the neutral position.The diameter A of block 18 is configured to identical size with the diameter B of bolt 19, in the neutral position shown in Figure 12 (a) figure, contacted with block 18 and bolt 19 respectively owing to turn round arm 21a, the 21b of helical spring 21, the interval L between these arms 21a, the 21b is identical with the diameter B of the diameter A of block 18 and bolt 19.
When being positioned at the neutral position like this, when the diameter C that supposes retainer shaft 30 sets for and equates with the internal diameter of the spire 21c that is turned round helical spring 21, such shown in (b) figure of Figure 12, follow the rotation of cursor to move by bolt 19, when for example arm 21a that is turned round helical spring 21 opens, shunk and make diameter diminish, make retainer shaft 30 fastening owing to turn round the spire 21c of helical spring 21, to the excessive tension force of spire 21c effect, spire 21c might be damaged.
Therefore, the diameter that usually keeps being turned round the retainer shaft 30 of helical spring 21 set for than in to be turned round the internal diameter of spire 21c of helical spring 21 littler immediately.
Yet, be originally such as mentioned above, the diameter that keeps being turned round the retainer shaft 30 of helical spring 21 set for than in immediately the internal diameter of being turned round helical spring 21 littler, also therefore produced problem, below this problem is described.
Figure 13 is the figure of structure at the main position of the rotary current potential meter that possesses in original technology of expression, (a) figure is an elevation, (b) figure schemes accordingly with the H1 cross section of (a) figure, (c) figure schemes accordingly with the H2 cross section of (b) figure, Figure 14 is the figure that the problem that produces in original technology is described, (a) figure be expression to the figure of the problem that produces when action bars is operated of a fixed direction, (b) figure be expression to the figure of the problem that produces when in the opposite direction action bars being operated of a fixed side, Fig. 9 is the figure of the output characteristics of rotary current potential meter in the original technology of expression.
Shown in Figure 13,14 is that a diameter of the retainer shaft 20 that is provided with on rotary current potential meter 11 is set the littler state of internal diameter than the spire 21c that is turned round helical spring 21 for.In addition, also represented the cursor 14 that the turning cylinder 13 with rotary current potential meter 11 is wholely set.On this cursor 14, be formed with the elongated slot 15 that constitutes link rod part.Have again, in Figure 13 (b) figure, represented to along the axial mobile cap assembly that limits 31 of turning cylinder 13 and with screw togather in the threaded portion that forms on the retainer shaft 20, cap assembly 31 be fixed on screw 23 on the retainer shaft 20.Other is with described shown in Figure 6 identical.
In this original technology, from the neutral condition shown in Figure 13 (a) and (b), not shown action bars to a fixed direction such as front side shake, just such as Figure 13 (c) shown in, be accompanied by shaking of action bars, the cursor 14 of rotary current potential meter 11 rotates.At this moment, power F imposes on the arm 21a that is turned round helical spring 21 by means of the bolt 19 of cursor 14, is turned round helical spring 21 and moves up to its spire 21c and run into retainer shaft 20.
When not shown action bars returns the neutral position from this state, owing to turned round the spire 21c of helical spring 21 like that at the state of running into retainer shaft 20 as mentioned above, can cause this turned round helical spring 21 than this the state of original neutral position, promptly the state shown in (a) figure of Figure 13 more tilts.Follow in this, cursor 14 is just such shown in (a) figure of Figure 14, is created in the situation that original neutral position angle η before stops that returns to.
Also have, shown in Figure 14 16 is in the operation of attended operation bar and the projection that forms on the not shown extension arm that rotates, utilize the elongated slot 15 of this projection 16 and cursor 14, constitute pass through fixed gap cursor 14 and not shown extension arm with respect to operated described fixed direction of action bars 2 and the link rod part that couples together in the other direction thereof.
As mentioned above, even action bars returns to the neutral position, returned to from the neutral position the also words of the state of declinate degree η because of turning round the cursor 14 that helical spring 21 produces rotary current potential meter 11, as shown in Figure 9, the output voltage from rotary current potential meter 11 has output error Δ V to export in original place for ov.
Also have, not shown action bars when shaking in the opposite direction with a described side similarly, such shown in (b) figure of Figure 14, even action bars returns the neutral position, the spire 21c that is turned round helical spring 21 runs into retainer shaft 20, thereby the arm 14 that rotates returns to the situation of going back declinate degree η with respect to original neutral position.
Promptly, comprise in original technology of the technology shown in the patent documentation 1, be accompanied by the rotation of the cursor 14 of rotary current potential meter 11, because of the spire 21c that is turned round helical spring 21 moves up to running into retainer shaft 20, and have when action bars returns the neutral position position deviation that produces with respect to the original neutral position of cursor 14, and therefore make the problem of output characteristics variation.
In addition, Figure 16, the 17th illustrates that the figure of the state the when figure of the other problem that produces in original technology, Figure 16 are the expression operation, Figure 17 are immediately the figure of state during expression returns to.(a) figure of this Figure 17 be expression to the figure of the problem that produces when action bars is operated of a fixed direction, (b) figure be expression to the figure of the problem that produces when in the opposite direction action bars being operated of a fixed side.
Shown in Figure 16 is near the rotary current potential meter, as mentioned above, show the retainer shaft 20 that on the main body of rotary current potential meter 11, is provided with, what maintain spire 21c on this retainer shaft 20 is turned round helical spring 21, the turning cylinder 13 of rotary current potential meter 11, the block 18 that is arranged on the main body of this rotary current potential meter 11 and the action at the helical spring arm 21a of being turned round of neutral position, 21b is limited, making of forming on the described cursor 14 that is wholely set with turning cylinder 13 are turned round helical spring 21 and are openly opened portion, are bolt 19.Bolt 19 is equivalent to constitute the block of the overshooting shape of the portion of opening shown in the described patent documentation 1.Also have, form elongated slot 15 on cursor 14, this elongated slot 15 constitutes the link rod part that connection is provided with not shown extension arm.
As shown in Figure 16, in the original technology shown in patent documentation 1 grade, in the neutral position, be formed on the cursor 14 bolt 19 that is provided with peripheral side any some a and any some b of the formation arm 21a side margins of being turned round helical spring 21 contact, because of be accompanied by not shown action bars to for example the rotation of angle θ 2 of the turning arm that shakes operation 14 of a fixed direction, turned round helical spring 21 and moved to a c from described some b with respect to the contact point of the bolt 19 that on this cursor 14, is provided with.That is, be accompanied by the operation of shaking of the action bars that carries out repeatedly, the mutual sliding action of the bolt 19 of turning arm 14 and the arm 21a that is turned round helical spring 21 carries out repeatedly, and the result is easy to produce wearing and tearing at slipper.
In case produce this wearing and tearing, when not shown action bars returns the neutral position, the recess of the arm 21a that is turned round helical spring 21 that forms because of wearing and tearing enters because of the recess of wearing and tearing in the peripheral side formation of bolt 19, like this, produce the situation that the angle η of cursor 14 before returning to original neutral position shown in (a) figure of Figure 17 just stops.
Like this, in case the arm 14 that rotates at declinate degree η just to the situation of neutral position, as described as shown in Figure 15, should be 0V from the output voltage of rotary current potential meter 11 in the neutral position, but output error Δ V is arranged.
Also have, not shown action bars to the occasion of shaking operation in the opposite direction with a described side too, such shown in (b) figure of Figure 17, even get back to the neutral position, with described same, be accompanied by the bolt 19 and the wearing and tearing of being turned round the arm 21b of helical spring 21 of cursor 14, and the arm 14 that rotates is got back to the situation with respect to original neutral position declinate degree η.
Promptly, comprise that possessing of the technology shown in the patent documentation 1 turned round in helical spring original technology, be accompanied by the rotation of shaking the cursor 14 of operating the rotary current potential meter 11 that causes of the action bars that repeats, with above-mentioned same, at arm 21a, the 21b of cursor 14 with make between the bolt 19 of these arms 21a, the open cursor 14 of 21b and be easy to produce wearing and tearing, when getting back to the neutral position because of this wearing and tearing action bars, the position deviation of the neutral position that generation is original with respect to cursor 14 has so makes the problem of output characteristics variation.
Summary of the invention
The present invention proposes according to the actual conditions in above-mentioned original technology, its objective is provides a kind of electric control system, it possesses is turned round helical spring with what the cursor that is equipped with on the rotary current potential meter was remained neutral, can make cursor return to original neutral position reliably.
In order to reach described purpose, the present invention is a kind of electric control system, and it possesses: by the operator to a fixed direction or with this a fixed side shake the functional unit of operation in the opposite direction; The swing part that is accompanied by the shaking operation of this functional unit and shakes; Support the back shaft of this swing part; Rotation gesture potentiometer with corresponding angle of rotation signal of rotation of turning cylinder, output and this turning cylinder following shaking of described swing part and rotate; On described back shaft, be wholely set, extend the extension arm that is provided with to described rotary current potential meter direction; With the parallel plane vertical plane of the pivot region that includes this extension arm in link with this extension arm rotationally in, the cursor that on the described axis of rotation of described rotary current potential meter, is provided with integratedly; With respect to described the fixed direction of the described functional unit of operation and described opposite direction pass through fixed gap link rod part that this cursor and described extension arm are linked up; The described cursor of described rotary current potential meter is remained on the helical spring of being turned round of neutral position; Be provided with on the described cursor, when described cursor rotates, make the described open portion of opening of helical spring of being turned round; On described rotary type current potential, be provided with, keep the described retainer shaft of being turned round helical spring spire, it is characterized in that: possess turned round the limiting mechanism that helical spring spire limits in described a fixed direction and described reciprocal action neutral position described.
The present invention of Gou Chenging like this, be maintained at neutral state at functional unit, by utilize limiting mechanism to turned round helical spring spire a fixed direction and reciprocal action limit, turned round the correct status that helical spring is maintained at not to be had to tilt, follow in this state that setting that cursor of rotary current potential meter is maintained at not to be had to tilt is provided with.Like this, the turning cylinder that is wholely set with cursor also is maintained at correct neutral position.At this state, at the link rod part that cursor and extension arm are linked up, with respect to a fixed direction and form fixed to some extent gap in the other direction respectively.These fixed gap form dead band with respect to the operation of functional unit.Therefore, though functional unit fine motion in the scope of dead band, can be from rotary current potential meter output angle of rotation signal yet.
Surpass described dead band in case functional unit is operated into from this neutral condition, extension arm just is that rotate at the center with the back shaft, follows in this, and the cursor of rotary current potential meter rotates by means of link rod part, and the turning cylinder that is wholely set with this cursor just rotates.Like this, just be output with the corresponding angle of rotation signal of the operational ton of functional unit.During this period, turned round helical spring and opened, when being turned round helical spring spire and shrink, utilize the power that applies by means of the portion of opening to be turned round helical spring spire and move, be limited mechanism and limited but should move by the opening portion of cursor.That is, while turned round helical spring spire and run into limiting mechanism and slide and shrink.
In addition, in case make this functional unit turn back to neutrality from the mode of operation of described functional unit, the power that applies owing to the portion of opening by means of cursor is disengaged, so, turned round helical spring and returned to neutral condition.At this moment, expanded from the state of described contraction though turn round helical spring spire, when the neutral condition, a fixed direction and reciprocal action be limited mechanics limit.Therefore, in neutral condition, turned round the correct status that helical spring returns to not to be had to tilt, follow in this, cursor also remains on original setting state is set, and the turning cylinder of rotary current potential meter returns correct neutral position reliably.
Like this, the present invention is turned round helical spring when the mode of operation of functional unit returns the neutral position what cursor is remained on the neutral position, owing to return to correct neutral condition, can make with this cursor of being turned round the rotary current potential meter that helical spring cooperates and return to the not original neutral position of inclination reliably by means of limiting mechanism.
In addition, the invention is characterized in: in described invention, possess and turned round the cap assembly that helical spring limits in the action with the direction of the opposite direction quadrature of described fixed direction and described direction described, simultaneously, described limiting mechanism by be equipped with at described cap assembly and form with a pair of guide part that described two sidepieces being turned round helical spring described spire contact in the neutral position.The present invention of Gou Chenging like this, owing to be on cap assembly, to be arranged on neutral position and the structure of being turned round a pair of guide part that helical spring two sidepieces contact, thereby the increase of part count can not be caused.
In addition, the invention is characterized in that in described invention, described cap assembly is made by metal material, simultaneously, described guide part bending forms.The present invention of Gou Chenging be owing to only can form a pair of guide part by the curved cover parts like this, thereby the making of guide part is simple.
In addition, the invention is characterized in described invention, when the described retainer shaft of described rotary current potential meter has the threaded portion, to possess and combine with the threaded portion screw thread of this maintaining part and described cap assembly is fixed on screw on the described retainer shaft.The present invention of Gou Chenging like this utilizes screw to be securely fixed in cap assembly on the retainer shaft.
In addition, the invention is characterized in that in described invention, the described portion of opening is made up of the bolt that forms on described cursor.The present invention of Gou Chenging like this can be when making cursor, and the bolt that formation is opened portion is with being pressed into or riveting and other methods being located on the arm.
Have, the present invention is a kind of electromotive force operating means again, and it possesses: by the operator to a fixed direction or with this a fixed side shake the functional unit of operation in the opposite direction; The swing part that is accompanied by the shaking operation of this functional unit and shakes; Support the back shaft of this swing part; Rotation gesture potentiometer with corresponding angle of rotation signal of rotation of turning cylinder, output and this turning cylinder following shaking of described swing part and rotate; On described back shaft, be wholely set, extend the extension arm that is provided with to described rotary current potential meter direction; With the parallel plane vertical plane of the pivot region that includes this extension arm in link with this extension arm rotationally in, the cursor that on the described axis of rotation of described rotary current potential meter, is provided with integratedly; The described cursor of described rotary current potential meter is remained on the helical spring of being turned round of neutral position; The block of being turned round helical spring arm movement of restriction neutral position; When described cursor rotates, make the described open portion of opening of helical spring of being turned round, it is characterized in that the described portion of opening is made up of rotary body.
The present invention of Gou Chenging like this, in case from neutral condition functional unit is operated, extension arm just is that rotate at the center with the back shaft, follows in this, and the cursor of rotary current potential meter just rotates, and the turning cylinder that is wholely set on this cursor rotates.Like this, be output with the corresponding angle of rotation signal of the operational ton of functional unit.During this period, utilize to constitute and open the rotor of portion, turned round helical spring arm and opened.Be accompanied by this and turned round opening of helical spring arm, the rotary body rotation that contacts with arm.Therefore, be accompanied by the operation of shaking of the functional unit that carries out repeatedly, bearing and turned round being suppressed of wearing and tearing between the helical spring arm.
In addition,,, the rotary body by means of cursor is disengaged owing to being applied to the power of being turned round helical spring arm in case make this functional unit return to neutrality from the mode of operation of described functional unit, so, turned round helical spring and returned to neutral condition.This action of being turned round helical spring arm is in by the state of stop limits.At this moment, as mentioned above, be accompanied by the operation of shaking of the functional unit that carries out repeatedly, rotary body and the rotation that is rotated body of being turned round the wearing and tearing between the helical spring arm suppress, so, can and do not turned round helical spring arm, can be kept original shape for a long time at rotary body because of wearing and tearing form recess.Therefore, the cursor in the neutral position also remains on original setting state is set, and can make the turning cylinder of rotary current potential meter return correct neutral position reliably.
Like this, the present invention since shaking the helical spring arm of being turned round of operation and making between the open rotary body of this arm of the functional unit that can utilize the rotation of rotary body to suppress to be accompanied by to carry out repeatedly wear and tear, so when mode of operation returns the neutral position, can make with the cursor of being turned round the rotary current potential meter that helical spring cooperates and return to the original neutral position that do not tilt at functional unit.
In addition,, the invention is characterized in that described rotary body is made up of bearing according to described invention.
In addition,, the invention is characterized in, described block is set on the main body of described rotary current potential meter, described bearing is rotated the axial region that is installed in freely on the described cursor that is formed at described rotary current potential meter according to described invention.
In addition,, the invention is characterized in, on the described cursor of described rotary current potential meter, described block is set, described bearing is rotated the axial region that is installed in freely on the main body that is formed at described rotary current potential meter according to described invention.
The present invention since possess to the neutral position turned round helical spring spire the limiting mechanism that limits of a fixed direction and reciprocal action, return to original neutral position reliably thereby can make with the cursor of being turned round the rotary current potential meter that helical spring cooperates.That is, can prevent when functional unit from returning the neutral position, can access the high output characteristics of precision with comparing originally from the position deviation of the original neutral position of cursor.
In addition, the present invention utilizes the cursor of rotary current potential meter to be accompanied by the rotation of shaking operation of functional unit, and when rotor made and turned round helical spring arm and open, rotary body was rotated.Therefore, can utilize the rotation of described rotary body to suppress to be accompanied by the rotary body that shakes operation and the wearing and tearing of being turned round helical spring arm of the functional unit that carries out repeatedly.Like this, can make rotary body and be turned round helical spring arm to remain on the original shape that not to produce distortion for a long time, can make with the cursor of being turned round the rotary current potential meter that helical spring cooperates and return to regular neutral position reliably.That is, cursor position deviation from regular neutral position when functional unit returns the neutral position can be prevented, the high output characteristics of precision can be accessed with comparing originally.
Description of drawings
Fig. 1 is the figure of the 1st embodiment of expression electric control system of the present invention, is to have omitted the vertical view that action bars is represented (a), (b) is the elevation of representing action bars with imaginary line.
Fig. 2 be the elongated slot that forms on the cursor of the rotary current potential meter that possesses of expression the 1st embodiment with extension arm on the figure that concerns of the position of the projection that is provided with.
Fig. 3 is the figure of the main position structure of the rotary current potential meter that possesses of expression the 1st embodiment, and (a) figure is an elevation, and (b) figure schemes accordingly with the G1 cross section of (a) figure, and (c) figure schemes accordingly with the G2 cross section of (b) figure.
Fig. 4 is the figure of the action of expression the 1st embodiment.
Fig. 5 is the figure of the output characteristics of the rotary current potential that obtains in the 1st embodiment of expression.
Fig. 6 is the figure of the rotary current potential meter of expression the 2nd embodiment of the present invention, is to have omitted the vertical view that action bars is represented (a), (b) is the elevation of representing action bars with imaginary line.
Fig. 7 is the figure of the main position structure of the rotary current potential meter that possesses of expression the 1st embodiment, and (a) figure is an elevation, and (b) figure schemes accordingly with the G1 cross section of (a) figure, and (c) figure schemes accordingly with the G2 cross section of (b) figure.
Fig. 8 is the sectional view at the main position represented of enlarged drawing 7 (b) figure.
Fig. 9 is the figure of the action of expression the 2nd embodiment.
Figure 10 is that expression is accompanied by that action shown in Figure 9 is open is turned round helical spring figure.
Figure 11 is the figure of expression the 3rd embodiment of the present invention, and (a) figure is the figure of the main position structure of rotary electric position meter immediately in the expression, (b) figure of the main position structure of rotary current potential meter during figure expression operation.
Figure 12 be the original technology of expression possess turned round helical spring and keep this to be turned round the key diagram of the relation of helical spring retainer shaft.
Figure 13 is the figure of structure at the main position of the rotary current potential meter that possesses of the original technology of expression, and (a) figure is an elevation, and (b) figure schemes accordingly with the H1 cross section of (a) figure, and (c) figure schemes accordingly with the H2 cross section of (b) figure.
Figure 14 is the figure that the problem that produces in original technology is described, (a) figure be expression to the figure of the problem that produces when action bars is operated of fixed direction, (b) figure be expression to the figure of the problem that produces when in the opposite direction action bars being operated of fixed side.
Figure 15 be the original technology of expression the figure of output characteristics of rotary current potential meter.
Figure 16 is the figure that the problem that produces in original technology is described, the figure of the state when particularly expression is operated.
Figure 17 is the figure that the problem that produces in original technology is described, immediately the figure of state during particularly expression recovers, (a) figure be expression to the figure of the problem that produces when action bars is operated of fixed direction, (b) figure be expression to the figure of the problem that produces when in the opposite direction action bars being operated of fixed side.
Among the figure: 1-main body, 2-action bars, 3-Hooks coupling universal coupling, 4-the 1st universal joint (swing part), 5-the 2nd universal joint (swing part), 6-cam (swing part), the 7-push rod, 8-back shaft, 9-extension arm, the 10-carriage, the rotary current potential meter of 11-, 13-turning cylinder, the 14-cursor, 15-elongated slot, 14-cursor, 15-elongated slot (link rod part), 16-projection (link rod part), 17-shakes the center, the 18-block, 19-bolt (opening portion), 20-retainer shaft, 21-is turned round helical spring, 21a-arm, 21b-arm, the 21c-spire, 22-cap assembly, 22a-guide part (limiting mechanism), 22b-guide part (limiting mechanism), 23-screw, 30-axial region, 31-bearing (rotating part) [opening portion], 32-block, 33-axial region, 34-bearing (rotating part) [opening portion], the x-space
The specific embodiment
Below be used to implement the optimal way of electric control system of the present invention based on accompanying drawing explanation.
The 1st embodiment
The basic comprising of present embodiment
Fig. 1 is the figure of 1 embodiment of the electric control system of expression the 1st embodiment of the present invention, (a) figure has omitted the vertical view that action bars is represented, (b) figure is an elevation of representing action bars with imaginary line, Fig. 2 be the elongated slot that forms on the cursor of the rotary current potential meter that possesses of expression present embodiment with extension arm on the figure that concerns of the position of the projection that is provided with.In addition, Fig. 3 is the figure of the main position structure of the rotary current potential meter that possesses of expression present embodiment, and (a) figure is an elevation, and (b) figure schemes accordingly with the G1 cross section of (a) figure, and (c) figure schemes accordingly with the G2 cross section of (b) figure.
Present embodiment is as the operating means of oil brakes such as various oil hydraulic cylinders that possess on operational example such as the hydraulic crawler excavator or oil pressure motor,, possesses: the main body 1 of function lever apparatus (b) shown in the figure as Fig. 1 (a); By the operator shake the functional unit of operation, as action bars 2; Hooks coupling universal coupling 3 with these action bars 2 bindings; Be supported on rotationally on the main body 1, be accompanied by the 1st universal joint 4 that action bars 2 rotates the shaking operation of for example directions X; With the direction of the extending direction quadrature of the 1st universal joint 4 extend be provided with in, be supported on rotationally on the main body 1, be accompanied by the 2nd universal joint 5 that action bars 2 rotates the shaking operation of for example Y direction; Follow the shake operation of action bars 2 in directions X, Y direction, or the shaking operation of the direction in the middle of directions X and the Y direction and the cam 6 that shakes; Follow shaking of this cam 6 and when moving up and down, neutral restoring force is passed to a plurality of push rods 7 of cam 6.
Described the 1st universal joint the 4, the 2nd universal joint 5 and cam 6 constitute the shaking swing part of operating and shaking of attended operation bar 2.
Possesses the back shaft 8 that supports described universal joint 4,5 as swing part in 1 side of main body of the face side of (b) figure that forms Fig. 1.The rotary current potential meter 11 of the corresponding angle of rotation signal of rotation with turning cylinder 13, output and this turning cylinder 13 of following shaking of described swing part and rotating has been installed on the carriage 10 that is fixed in below the main body in addition.Also possess above-mentioned same back shaft 8, carriage 10 and rotary current potential meter 11 in another side side with the one side side quadrature of main body 1.
Since the structure of the back shaft 8 that the structure that is included in the back shaft 8 that the described one side side of main body 1 possesses, rotary current potential meter 11 etc. and the described another side side that is included in main body 1 possess, rotary current potential meter 11 etc. want with, so, below the structure that mainly the one side side in main body 1 possessed describe.
In the one side side of main body 1, promptly be wholely set oriented rotary current potential meter 11 directions on the back shaft 8 that the face side of (b) figure of Fig. 1 possesses and extend the extension arm 9 that is provided with, be formed with projection 16 in the lower end of this extension arm 9.In addition, rotary current potential meter 11 have with the parallel plane vertical plane of the pivot region that comprises extension arm 9 in 9 that link with extension arm rotationally, be arranged on cursor 14 on the rotary current potential meter 11 integratedly.Be formed with elongated slot 15 in the upper end of this cursor 14, in this elongated slot 15 folding and unfolding the projection 16 of extension arm 9.
Utilize this projection 16 and elongated slot 15, constitute make cursor 14 and extension arm 9 in the vertical plane of action bars 2 operated for example directions Xs with respect to action bars 2 a fixed direction, for example Fig. 1 (b) figure left to and with a fixed side in the opposite direction, promptly the right of (b) figure of Fig. 1 pass through the link rod part that links up of fixed gap.
As shown in Figure 2, be held neutral state, between the both sides of the projection 16 of the edges at two ends portion of the elongated slot 15 of cursor 14 and extension arm 9, form the gap x of same size at action bars 2.Also having, the center of the back shaft shown in (b) figure of 17 presentation graphs 1 of this Fig. 2, is the center of shaking of extension arm 9.In addition, the θ of this Fig. 2 be projection 16 run into the cursor 14 that remains on neutral condition on one side edge part of elongated slot 15 time this projection 16 of connection the center and shake the line at center 17, the center that is connected this projection 16 when running into the edge part of elongated slot 15 another sides of the cursor 14 that remains on neutral condition with projection 16 and shake the line angulation at center 17 is formed by this angle and shakes the operation immunity region with respect to action bars 2.
In addition, as shown in Figure 3, present embodiment possesses is turned round helical spring 21 to what the cursor 14 of rotary current potential meter 11 remained on the neutral position.This is turned round a pair of arm 21a, 21b that helical spring 21 has spire 21c, is provided with continuously with this spire 21c.Be formed on to make when this cursor 14 rotates on cursor 14 and turned round the helical spring 21 open portions of opening, for example bolt 19.In addition, rotary current potential meter 11 is provided with and keeps the described retainer shaft 20 of the spire 21c of helical spring 21, the block 18 that mutual respectively action in the opposite direction limits to the arm 21a, the 21b that are turned round helical spring 21 turned round.
Also have, the external diameter of described retainer shaft 20 set for than the spire 21c that is turned round helical spring 21 little a lot, simultaneously, on retainer shaft 20, be formed with the threaded portion.
In addition, as shown in Figure 2, present embodiment possess to turned round helical spring 21 with the vertical plane of described X side shown in Figure 1 in a fixed direction and the action of the direction of quadrature in the other direction cap assembly 22 that limit, that for example make by metal material and screw togather with the threaded portion of retainer shaft 20 and cap assembly 22 is fixed on screw 23 on the retainer shaft 20.
The major part of present embodiment constitutes
Particularly in the present embodiment, possesses the limiting mechanism that limits in described a fixed direction and reciprocal action at the spire 21c that is turned round helical spring 21 of neutral position.This limiting mechanism is made up of a pair of guide part 22a, the 22b that run into the spire 21c both sides of being turned round helical spring 21.These guide parts 22a, 22b form in the bending of the both sides of cap assembly 22.
The action of present embodiment
Fig. 4 is the figure of action of expression the 1st embodiment, the figure of the output characteristics of Fig. 5 rotary current potential that to be expression obtain in present embodiment.
Shown in (b) figure of Fig. 1, remain on neutral state at action bars 2, the spire 21c that is turned round helical spring 21 with the vertical plane of X side shown in Figure 1 in action bars 2 a fixed direction and reciprocal action limited by a pair of guiding parts 22a, the 22b of the cap assembly 22 shown in (c) figure of Fig. 3.Like this, turned round helical spring 21 and be maintained at the correct status that do not tilt, follow in this, the cursor 14 of rotary current potential meter 11 also is maintained at the setting of not tilting state is set.And, because turning cylinder 13 and cursor 14 unitary rotation, thereby turning cylinder 13 also is maintained at correct neutral position.At this state, as shown in Figure 2, form equal gap x in the both sides of the projection 16 of the extension arm 9 of the elongated slot that is positioned at cursor 14.By these gaps x, form with respect to the immunity region that shakes operation of described angle θ corresponding operating 2.Therefore, as shown in Figure 5, even action bars 2 fine motion in corresponding to the immunity region of angle θ, also can be from rotary current potential meter 11 output angle of rotation signals, prevented to be accompanied by the maloperation of the oil brake that the vibrations etc. of the driving of the motor that possesses on the hydraulic crawler excavator of present embodiment equipment cause.
From this neutral condition, in the vertical plane of the directions X of for example Fig. 1, action bars 2 shown in (b) figure of this Fig. 1 to a fixed direction for example the left of (b) figure of Fig. 1 make to operation and surpass described immunity region that as shown in Figure 4, extension arm 9 be the center rotation with back shaft 8.Follow in this, by means of the projection 16 of extension arm 9 and the elongated slot 15 of cursor 14, cursor 14 opposings of rotary current potential meter 11 are turned round the elastic force of helical spring 21 and are rotated, and turning cylinder 13 also rotates.Therefore export the corresponding angle of rotation signal of operational ton with action bars 2.During this period, utilize the bolt 19 of cursor 14, the arm 21a that is turned round helical spring 21 shown in Fig. 3 (c) opens, the spire 21c that is turned round helical spring 21 shrinks, simultaneously, because of the power that applies by means of bolt 19, the spire 21c that is turned round helical spring 21 moves to the right of Fig. 3 (c) figure, is directed to the 22a of portion restriction but should move.That is, while turned round the spire 21c of helical spring 21 and meet guide part 22a and slide and shrink.
In addition, from the mode of operation of described action bars 2, it is neutral that this action bars 2 is returned to, and the power that applies owing to the bolt 19 by means of cursor 14 is disengaged, and is returned to neutral condition so turn round helical spring 21.At this moment, opened from described contraction state though turn round the spire 21c of helical spring 21, when arriving neutral condition, the action and the reciprocal action of described a fixed direction of the both sides of spire 21 are limited by a pair of guide part 22a, 22b.Therefore, in the neutral condition shown in (c) figure of Fig. 3, turned round helical spring 21 and returned to the not correct state of inclination, follow in this, cursor 14 also remains on original setting state is set, and the turning cylinder 13 of rotary current potential meter returns reliably up to correct neutral position.Like this, present embodiment can access output characteristics shown in Figure 5.
Also have, described in, action bars 2 is illustrated to the operated occasion of the directions X of Fig. 1, but is also to implement and described same action to the operation of the Y of Fig. 1 direction.In addition, to the third side of the directions X of Fig. 1 and Y direction during, utilize with described same action and export corresponding angle of rotation signal from each of 2 rotary current potential meters to operation.
The effect of present embodiment
Adopt the words of the above present embodiment that constitutes, since possess to the spire 21c that is turned round helical spring 21 of neutral position a fixed direction and reciprocal action the guide part 22a, the 22b that limit, return to original neutral position reliably thereby can make with the cursor 14 of being turned round the rotary current potential meter 11 that helical spring 21 cooperates.That is, can prevent that turning arm 14 can access the high accuracy output characteristics that does not produce output error shown in Figure 5 with respect to the position deviation of original neutral position when action bars 2 from returning the neutral position.
In addition, with a pair of guiding parts 22a, 22b constitute to the spire 21c that is turned round helical spring 21 of neutral position the limiting mechanism that limits of a fixed direction and reciprocal action, since these guide parts 22a, 22b be formed to turned round helical spring 21 with described fixed direction and the action of the direction of quadrature limits in the other direction cap assembly 22 on, thereby can not cause the increase of part count, can suppress the rising of fabricating cost.
In addition, because the two ends of the only crooked cap assembly made from metal material 22 just can form a pair of guiding parts 22a, 22b,, can suppress the rising of fabricating cost so the making of these guide parts 22a, 2b is simple.
In addition, utilize screw 23 that cap assembly 22 is fixed on structure on the retainer shaft 20 owing to make, thereby can be securely fixed in cap assembly 22 on the retainer shaft 20, can make the high structure of reliability.
Have again, bolt 19 formations that utilization is integrally formed on the cursor 14 follow the rotation of cursor 13 to make the helical spring 21 open portions of opening of being turned round, this bolt 19 can be arranged on the cursor 14 when making cursor 14 simultaneously, therefore, can not cause the increase of part count.Therefore also can suppress the rising of fabricating cost.
The 2nd embodiment
The basic comprising of present embodiment
Fig. 6 is the figure of an embodiment of the electric control system of expression the 2nd embodiment of the present invention, (a) be to have omitted the vertical view that action bars is represented, (b) be the elevation of representing action bars with imaginary line, Fig. 7 is the figure of the main position structure of the rotary current potential meter that possesses of expression present embodiment, (a) figure is an elevation, (b) figure schemes accordingly with the G1 cross section of (a) figure, and (c) figure schemes accordingly with the G2 cross section of (b) figure.Fig. 8 is the sectional view at the main position represented of enlarged drawing 7 (b) figure.Also having, be all identical except that the structure around the turning cylinder 13 of that illustrated referring to figs. 1 through Fig. 3 and structure cap assembly 22 and cursor 14 in the 1st embodiment at basic comprising itself, thereby the repetitive description thereof will be omitted, only different points described.
Present embodiment is not provided with guide part 22a, 22b on the cap assembly 22 in the 1st embodiment, but has changed block 18, axial region 30, bearing 31 etc. as shown in Figure 6.As described below in detail.
The major part structure of present embodiment
In addition, shown in Fig. 7,8, present embodiment possesses is turned round helical spring 21 to what the cursor 14 of rotary current potential meter 11 remained on the neutral position.This is turned round a pair of arm 21a, 12b that helical spring 21 has spire 21c, is provided with continuously with this spire.Axial region 30 for example is set on cursor 14, on this axial region 30, rotates and make arm 21a or open rotary body such as the bearing 31 that opens portion of 21b of being turned round helical spring 21 when freely the rotation that is formed in cursor 14 being installed.In addition, the block 18 that on the main body of rotary current potential meter 11, is provided with the retainer shaft 20 that keeps the described spire 21c that is turned round helical spring 21 and the arm 21a, the 21b that are turned round helical spring 21 is limited in the action of opposed facing direction in the neutral position.
Also have, the external diameter of described retainer shaft 20 is set for littler a lot, simultaneously, on retainer shaft 20, be formed with the threaded portion than the internal diameter of the spire 21c that is turned round helical spring 21.In addition, the external diameter of block 18 is set for identical size with the external diameter of bearing 31.
In addition, present embodiment possess to turned round helical spring 21 with the vertical plane of described X side shown in Figure 6 in a fixed direction and the action of the direction of quadrature cap assembly 22 that limit, that for example make by metal material and combine with the threaded portion screw thread of retainer shaft 20 and cap assembly 22 is fixed on screw 23 on the retainer shaft 20 respectively in the other direction.
Other each several parts make with described the 1st embodiment in the identical structure of main body of function lever apparatus, bring into play same effect.
The action of present embodiment
Fig. 9 is the figure of action of expression present embodiment, and Figure 10 is that expression is accompanied by that action shown in Figure 9 is open is turned round helical spring figure, the output characteristics of the rotary current potential meter that obtains in the present embodiment as in the 1st embodiment as shown in Figure 5.
As described shown in (c) figure of Fig. 7, remain on neutral state at action bars 2, arm 21a, the 21b that is turned round helical spring 21 in the vertical plane of X side shown in Figure 6 a fixed direction and reciprocal action shown in (c) figure of Fig. 7, limited by the block 18 that on rotary current potential meter 11, is provided with like that.Like this, turned round helical spring 21 and be maintained at the correct status that do not tilt, follow in this, the cursor 14 of rotary current potential meter 11 also is maintained at the setting of not tilting state is set.Therefore, the turning cylinder 13 that is wholely set with cursor 14 also is maintained at correct neutral position.At this state, form equal gap in the both sides of the projection 16 of the extension arm 9 of the elongated slot 15 that is positioned at cursor 14.By these gaps, form the immunity region that shakes operation with respect to action bars 2.Therefore, even action bars 2 fine motion in corresponding to the immunity region of angle θ, also can be from rotary current potential meter 11 output angle of rotation signals, prevented to be accompanied by the maloperation of the oil brake that the vibrations etc. of the driving of the motor that is equipped with on the hydraulic crawler excavator of present embodiment equipment cause.
From this neutral condition, in the vertical plane of the directions X of for example Fig. 6, action bars 2 shown in (b) figure of Fig. 6 be operated to a fixed direction for example the left of (b) figure of Fig. 6 is to surpassing described immunity region, as shown in Figure 9, extension arm 9 be the center rotation with back shaft 8.Follow in this, the cursor 14 of rotary current potential meter 11 is resisted the elastic force of being turned round helical spring 21 by means of the projection 16 of extension arm 9 and the elongated slot 15 of cursor 14, rotational angle θ 2 as shown in Figure 10 for example, the turning cylinder 13 that is wholely set with this cursor 14 also rotates.Like this, be output with the corresponding angle of rotation signal of the operational ton of action bars 2.During this period, utilize the bearing of installing on the axial region 30 of cursor 14 31, as shown in Figure 10, the arm 21a that is turned round helical spring 21 is opened, and the spire 21c that is turned round helical spring 21 shrinks.During this period, be accompanied by the action of opening of arm 21a, bearing 31 rotations.
In addition, it is neutral from the mode of operation of described action bars 2 this action bars 2 to be returned to, because cursor 14 is applied to the power of being turned round on the helical spring 21 by means of bearing 31 and is disengaged, is turned round helical spring 21 and returns to neutral condition.At this moment, bearing 31 and the arm 21a that turned round helical spring 21 are accompanied by the rotation of described bearing 31 and can produce wearing and tearing.That is, owing to remain on the original shape that does not produce distortion, so, turned round the correct status that helical spring 21 returns to not to be had to tilt, follow in this, cursor 14 also remains on original setting state is set, and the turning cylinder 13 of rotary current potential meter 11 turns back to correct neutral position reliably.Like this, present embodiment can access the output characteristics that does not produce output error shown in Figure 10.
Also having, in described, action bars 2 is illustrated to the operated occasion of the directions X of Fig. 6, is also to implement and described same action but operate to the Y of Fig. 6 direction.In addition, to the third side of the directions X of Fig. 6 and Y direction during, utilize with described same action and export corresponding angle of rotation signal from each of 2 rotary current potential meters 11 to operation.
The effect of present embodiment
Adopt the present embodiment of above structure, utilize the cursor 14 of rotary current potential meter 11 to be accompanied by shaking operation and rotating of action bars 2, when bearing 31 opens the arm 21a that turned round helical spring 21 or 21b, bearing 31 rotations.Therefore, can suppress to be accompanied by the bearing that shakes operation 31 of the action bars 2 that carries out repeatedly and turned round the arm 21a of helical spring 21, the wearing and tearing of 21b.Like this, arm 21a, the 21b that can make bearing 31 and be turned round helical spring 21 remains on the original shape that the distortion of not producing for a long time, can make with the cursor 14 of being turned round the rotary current potential meter 11 that helical spring 21 cooperates and return to regular neutral position reliably.That is, cursor 14 position deviation from original neutral position when action bars 2 returns the neutral position can be prevented, the high output characteristics of the precision that does not produce output error shown in Figure 10 can be accessed.
The 3rd embodiment
Figure 11 is the figure of expression the 3rd embodiment of the present invention, and (a) figure is the figure of the main position structure of rotary electric position meter immediately in the expression, (b) figure of the main position structure of rotary current potential meter during figure expression operation.
This 3rd embodiment shown in Figure 11 is located at the block 32 that the action at the arm 21a, the 21b that are turned round helical spring 21 of neutral position is limited on the cursor 14 of rotary current potential meter 11, open rotary body such as bearing 34 rotations of opening portion of the arm 21a, the 21b that are turned round helical spring 21 is installed on the axial region 33 that is formed on rotary current potential meter 11 main bodys freely.Other structures are identical with described the 2nd embodiment.
Other embodiment of Gou Chenging is also in when operation of shaking of the action bars 2 that carries out repeatedly like this, when the arm 21b that utilizes bearing 34 to make to be turned round helical spring 21 opens, is accompanied by it and opens action, bearing 34 rotations.Therefore, the generation of the wearing and tearing between the arm 21b that is turned round helical spring 21 that can be suppressed at bearing 34 and contact etc. with this bearing 34, in action bars 2 recovers, immediately, can make cursor 14 return to regular neutral position, obtain and the equal action effect of described embodiment.
Also have, in said embodiment, the rotary body that constitutes the portion of opening is made of bearing, but the present invention is not limited to possess this bearing.For example, rotary body is made of swing roller and also can.
Claims (9)
1. electric control system, it possesses:
By the operator to a fixed direction or with this a fixed side shake the functional unit of operation in the opposite direction; The swing part that is accompanied by the shaking operation of this functional unit and shakes; Support the back shaft of this swing part; Have the turning cylinder of following shaking of described swing part and rotating, and the rotary type potentiometer of the corresponding angle of rotation signal of rotation of output and this turning cylinder; On described back shaft, be wholely set, extend the extension arm that is provided with to described rotary current potential meter direction; With the parallel plane vertical plane of the pivot region that includes this extension arm in link with this extension arm rotationally in, the cursor that on the described axis of rotation of described rotary current potential meter, is wholely set; Respectively with respect to described a fixed direction and the described opposite direction of the described functional unit of operation, pass through fixed gap link rod part that this cursor and described extension arm are linked up; The described cursor of described rotary current potential meter is remained on the helical spring of being turned round of neutral position; Be provided with on the described cursor, when described cursor rotates, make the described open portion of opening of helical spring of being turned round; On described rotary type potentiometer, be provided with, keep the described retainer shaft of being turned round helical spring spire, it is characterized in that:
Possess turned round the limiting mechanism that helical spring spire limits in described a fixed direction and described reciprocal action neutral position described.
2. electric control system according to claim 1 is characterized in that:
Possess and turned round the cap assembly that helical spring limits in the action with the direction of described fixed direction and described opposite direction quadrature described, simultaneously,
Described limiting mechanism by on described cap assembly, be equipped with, form with a pair of guide part that described two sidepieces being turned round helical spring described spire contact in the neutral position.
3. electric control system according to claim 2 is characterized in that:
Described cap assembly is made by metal material, and simultaneously, described guide part bending forms.
4. according to claim 2 or 3 described electric control systems, it is characterized in that:
When the described retainer shaft of described rotary current potential meter has the threaded portion, possesses the screw that combines with the threaded portion screw thread of this maintaining part and described cap assembly is fixed on described retainer shaft.
5. according to the described electric control system of claim 1 to 4, it is characterized in that:
The described portion of opening is made up of the bolt that forms on described cursor.
6. electromotive force operating means, it possesses:
Shake the functional unit of operation by the operator; The swing part that is accompanied by the shaking operation of this functional unit and shakes; Support the back shaft of this swing part; Rotary current potential meter with the turning cylinder following shaking of described swing part and rotate and output and corresponding angle of rotation signal of rotation of this turning cylinder; On described back shaft, be wholely set, extend the extension arm that is provided with to described rotary current potential meter direction; With the parallel plane vertical plane of the pivot region that includes this extension arm in link with this extension arm rotationally in, the cursor that on the described axis of rotation of described rotary current potential meter, is provided with integratedly; The described cursor of described rotary current potential meter is remained on the helical spring of being turned round of neutral position; The block of being turned round helical spring arm movement of restriction neutral position; When described cursor rotates, make the described open portion of opening of helical spring described arm of being turned round, it is characterized in that:
The described portion of opening is made up of rotary body.
7. electric control system according to claim 6 is characterized in that:
Described rotary body is made of bearing.
8. electric control system according to claim 7 is characterized in that:
Described block is set on the main body of described rotary current potential meter, described bearing is rotated the axial region that is installed in freely on the described cursor that is formed at described rotary current potential meter.
9. electric control system according to claim 7 is characterized in that:
On the described cursor of described rotary current potential meter, described block is set, described bearing is rotated the axial region that is installed in freely on the main body that is formed at described rotary current potential meter.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004354051 | 2004-12-07 | ||
| JP2004354049A JP4494181B2 (en) | 2004-12-07 | 2004-12-07 | Electric operation device |
| JP2004354049 | 2004-12-07 | ||
| JP2004-354051 | 2004-12-07 | ||
| JP2004-354049 | 2004-12-07 | ||
| JP2004354051A JP4344836B2 (en) | 2004-12-07 | 2004-12-07 | Electric operation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1786357A true CN1786357A (en) | 2006-06-14 |
| CN1786357B CN1786357B (en) | 2011-07-06 |
Family
ID=36666921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510127949 Active CN1786357B (en) | 2004-12-07 | 2005-12-07 | Electric control device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4494181B2 (en) |
| CN (1) | CN1786357B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111907326A (en) * | 2019-05-07 | 2020-11-10 | 森萨塔科技公司 | Dual mode sensing joystick assembly |
| CN113498369A (en) * | 2020-02-03 | 2021-10-12 | 元田技研株式会社 | Operation unit of load processing device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4898378B2 (en) * | 2006-10-06 | 2012-03-14 | 三菱重工業株式会社 | Potentiometer operating mechanism |
| JP6641211B2 (en) * | 2016-03-23 | 2020-02-05 | 大裕株式会社 | Heavy equipment remote control |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5758725Y2 (en) * | 1978-07-17 | 1982-12-15 | ||
| JPH057624Y2 (en) * | 1988-03-22 | 1993-02-25 | ||
| JP3993761B2 (en) * | 2001-11-21 | 2007-10-17 | 日立建機株式会社 | Electric operation device |
| US6971279B2 (en) * | 2003-02-12 | 2005-12-06 | Volvo Construction Equipment Holding Sweden Ab | Control lever safety apparatus for heavy equipment |
-
2004
- 2004-12-07 JP JP2004354049A patent/JP4494181B2/en not_active Expired - Fee Related
-
2005
- 2005-12-07 CN CN 200510127949 patent/CN1786357B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111907326A (en) * | 2019-05-07 | 2020-11-10 | 森萨塔科技公司 | Dual mode sensing joystick assembly |
| CN113498369A (en) * | 2020-02-03 | 2021-10-12 | 元田技研株式会社 | Operation unit of load processing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006165249A (en) | 2006-06-22 |
| CN1786357B (en) | 2011-07-06 |
| JP4494181B2 (en) | 2010-06-30 |
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