JP6001725B2 - Lever type liquid ejector - Google Patents

Description

  The present invention relates to a lever-type liquid ejecting apparatus in which liquid spraying is started and stopped only by lever operation, and the liquid spraying form is changed to a plurality by changing the grip amount of the lever. The present invention relates to a gun-type lever-type liquid ejecting apparatus that is surely made by a simple mechanism.

  As a conventional example of the lever-type liquid ejecting apparatus, there is one disclosed in Patent Document 1 below. The lever-type liquid ejecting apparatus described in the same document was developed by the present applicant, and is attached to a main body having a gripping portion, and is operated by operating the lever biased in the return direction by a spring. The spray amount adjusting body built in the main body is operated.

  The lever can be pivoted about a support shaft. By adjusting the amount of grip (rotation amount) of the lever, the operating position of the spray amount adjusting body can be changed to change the lever position from the nozzle at the tip of the main unit. The shape of the jet water flow is changed.

  The lever can be locked to the main body step by step at a plurality of positions where the operating positions of the spray amount adjusting body are different, and the locked state at each operation position can be maintained. Holding of the locked state at each operation position of the lever is performed by a multistage locking mechanism provided between the lever and the grip portion.

  Such a lever-type liquid ejecting apparatus can start and stop the liquid spraying only by operating the lever. In addition, even if the hand is released from the lever, the spray or spraying mode can be maintained by holding the lever at the position where the amount of grip has been changed in advance, and the lever can be returned to the initial position by operating the lever alone. It is also possible to return the injection mode to the stopped state.

  The multi-stage locking mechanism includes a plurality of locking claws provided on the main body side (each locking claw has a front-facing inclined surface and a rear surface having a non-inclined standing surface) and the lever. It has a ratchet pawl that is pivotally engaged.

  The ratchet pawl is biased in the locking direction by a spring. When the lever is gripped and moved from the initial position to the gripping portion, the ratchet pawl climbs over the slope of the first locking pawl as counted from the lever side. To the first locking claw.

  When the lever grip is increased, the ratchet pawl climbs over the slope of the second locking pawl and locks to the second pawl, and when the grip is increased, the third locking pawl Get over the claw slope and lock it to the 3rd claw.

  As a result, the injection mode is switched in the order of wide-spread injection, narrow-angle injection, and direct injection with an injection angle of approximately 0 degrees.

  When the lever is further squeezed from the direct position, the ratchet pawl is guided to the position where the ratchet pawl is disengaged from the oldest pawl by the action of the disengagement mechanism included in the multi-stage latching mechanism, The backlash prevention part of the guide mechanism included in the multistage locking mechanism prevents the ratchet pawl from going backwards, and when the lever is released, it is guided to the return path by the guide of the guide mechanism so that the lever does not go backwards. Return to the initial position (injection stop position).

Japanese Patent No. 5412659

  Patent Document 1 lists two forms as a guide mechanism included in the multistage locking mechanism. In the first form of the guiding mechanism, a pin provided on one side surface of the ratchet claw on the tip side in a direction parallel to the lever support shaft passes over a locking claw provided on the main body side and is placed on the guide. It is equipped with a retrograde prevention part with a structure to transfer to.

  However, the anti-reverse portion of the guide mechanism of the first embodiment has a very small locking claw, and the locking claw when the free end of the cantilevered pin provided on the ratchet claw gets over the locking claw. Strongly rubbed against the slope of At this time, since a force in the direction of tilting the pin acts on the pin, the pin is easily deformed or broken, and it is difficult to obtain satisfactory durability.

  For this reason, the commercialized lever-type liquid ejecting apparatus employs the second type of guiding mechanism.

  The guide mechanism of the second form is shown in FIGS. 10 to 13 of Patent Document 1, and the guide mechanism is provided on the grip portion side, and the side surface on the tip side of the ratchet claw. A movable piece that can be rotated about a support shaft that is erected on the fulcrum, a stopper pin that protrudes from the side surface on the tip side of the ratchet claw and restricts the rotation range of the movable piece, and before the lever is fully gripped And an engagement surface that contacts the movable piece and rotates the movable piece by further gripping of the lever thereafter.

  Regardless of the posture of the injection device, the movable piece is in a posture in which one end faces the direction of the engagement surface and passes by the side of the guide.

  After the movable piece passes by the side of the guide, the movable piece comes into contact with the engagement surface, and further rotates to a position where the lever is further gripped to receive the rotation restriction by the stopper pin. When the lever is released, the ratchet pawl is prevented from reversing, and when the lever is released, the movable piece is guided to the upper surface of the guide and the lever returns to the initial position without reversing.

  As described above, the lever-type liquid ejecting apparatus of Patent Document 1 provided with the guiding mechanism according to the second embodiment prevents the ratchet claw from reversing (lever reversing) by providing the movable piece whose posture changes according to the grip amount of the lever. To do. Therefore, the durability of the guide mechanism is less likely to be deteriorated due to wear of the sliding portion as compared with a device including the guide mechanism of the first form.

  However, the guide mechanism of the second form needs to incorporate a movable piece and a stopper pin that regulates the amount of rotation of the movable piece in a limited space, which complicates the structure and makes it difficult to assemble.

  Further, since both the support shaft serving as the pivot point of the movable piece and the stopper pin are cantilevered, inevitable deformation and breakage occur.

  The lever-type liquid ejecting apparatus including the second form of the guiding mechanism has already been commercialized and provided to the market, but there are users who desire a product with higher durability.

  Accordingly, the present invention provides a lever-type liquid ejecting apparatus that achieves the prevention of the reverse movement of the lever and the reliable return to the initial position with a simpler mechanism and also improves the durability of the guiding mechanism that enables this. For the purpose.

  In order to solve the above problems, the present invention operates a spray amount adjusting body incorporated in the main body with a lever attached to the main body, and changes the form of the jet water flow from the nozzle portion at the front end of the main body according to the grip amount of the lever. A plurality of locking claws provided on the grip portion of the main body, a ratchet claw that is rotatably attached to the lever, and a biasing force in the direction in which the ratchet claw is engaged with the locking claw A lever-type liquid ejecting apparatus that holds the lever stepwise at a position where the ratchet pawls respectively engage with the engaging claws is configured as follows by a multistage engaging mechanism combined with an elastic body. .

  That is, the multi-stage locking mechanism is engaged with an engagement release mechanism that disengages the ratchet claw from the locking claw at a position where the lever is gripped to a maximum gripping amount. The unraveled ratchet pawl is combined with a guiding mechanism for guiding it to the initial position through the return path.

  Further, the guide mechanism has a guide provided on the grip portion side so as to be parallel to the lock pawl at a position above the lock pawl, a slider provided on the upper end of the ratchet pawl, and on the grip portion side. The retrograde prevention part of the said ratchet nail | claw to provide was included.

  Further, the retrograde prevention portion includes a moving path through which the slider is passed and a stopper provided across the moving path in the width direction in the middle of the moving path, and the sliding is at a position where the lever is fully gripped. The moving element is guided to the return path over the stopper while contacting the stopper with the outer peripheral surface, and the backward movement of the slider from the position over the stopper is prevented by the stopper.

  In this lever-type liquid ejecting apparatus, the stopper is detachably attached to the main body, and the stopper is immersed in the slider contact portion when the slider moves toward the return path. A spring that includes a slope that generates a component force that pushes the stopper in a direction, and that biases the stopper in a direction that protrudes from the main body is included in the anti-reverse portion, and overcoming the stopper of the slider causes the stopper to be immersed in the main body. Is preferably configured to occur by:

  However, the stopper may be constituted by a metal round pin implanted in the main body so that an outer peripheral surface of a convex arc in a side view protrudes into the moving path. The stopper of the round pin can also guide the slider to the return path by the slider being guided by the outer peripheral surface of the convex arc when viewed from the side so as to get over the stopper.

  In this device using the stopper of the round pin, in order to allow the slider to get over the stopper at the position where the lever is gripped to the maximum, the apex (protrusion end) of the outer peripheral surface of the convex arc of the stopper is placed on the lever. It arrange | positions in the start end side of a movement path rather than the site | part where the said slider contacts a stopper in the position grasped to the maximum.

  The stopper is set to have a protruding amount (stopper height) or the like to the moving path so that the slider cannot get over the stopper in the reverse direction by the return force of the lever spring.

  If the part where the stopper is to be installed is made of resin, a stopper that uses the round pin is implanted with a metal round pin, and the part of the outer periphery of the round pin is moved. It is preferable that the exposed portion is exposed on the road. The stopper portion formed of a metal round pin is superior in strength and wear resistance compared to those formed of resin, and the durability of the product is improved.

  If the ratchet claw itself is bent, the slider can be moved over the stopper even if the stopper is constituted by a round pin fixed at a fixed position.

  The slider is preferably provided integrally with a ratchet claw. Although it is conceivable to plant a pin as a separate member, the slider formed integrally is easier to ensure the strength and holding stability than the structure.

  According to the present invention, the slider moves over the stopper protruding from the moving path and moves to the return path at the position where the lever is fully gripped. Then, the backward movement of the slider that has moved to the return path is prevented by the stopper.

As a result, even if a reverse force is applied to the ratchet pawl when the lever is released, the slider is prevented from getting over the stopper in the reverse direction by being blocked by the stopper.

  Since the retrograde prevention is performed by the slider provided on the ratchet pawl and the stopper provided on the moving path, the complexity of the guide mechanism including the retrograde prevention unit and the complicated assembly are avoided.

  Further, since the outer peripheral surface of the slider is in contact with the stopper, the bending force and the depressing force are not applied to the slider. Therefore, the durability of the guide mechanism is also improved, and the user's demand for improving durability is also satisfied.

  In addition, the lever type liquid ejecting device that is configured so that the stopper can be moved in and out of the main body and the slider is moved over when the stopper is inserted into the main body, the slider does not apply much load to the ratchet claw. You can get over the stopper smoothly.

  Further, since the stopper is immersed in the main body and escapes, a large frictional force is not generated at the contact portion between the slider and the stopper, and the durability of the slider and the stopper is improved.

FIG. 3 is an enlarged longitudinal sectional view showing an embodiment of the lever type liquid ejecting apparatus according to the present invention when the ejection is stopped. FIG. 2 is a side view of the lever type liquid ejecting apparatus of FIG. 1. FIG. 2 is a plan view of the lever type liquid ejecting apparatus of FIG. 1. It is a longitudinal cross-sectional view which expands and shows the on-off valve and the rectifier valve of the lever-type liquid ejecting apparatus of FIG. It is a front view of the baffle plate contained in the rectifier valve. FIG. 2 is an exploded perspective view of a multistage locking mechanism for holding a switching position of a lever included in the lever type liquid ejecting apparatus of FIG. 1. It is a front view of the multistage locking mechanism of FIG. FIG. 2 is an enlarged longitudinal sectional view of a multistage locking mechanism provided in the lever type liquid ejecting apparatus of FIG. 1. It is sectional drawing which shows the open state {the figure (b)} of the rectifier valve and the open state {the figure (c)} of the on-off valve when the ratchet pawl is in the initial position {the figure (a)}. The open state {the same figure (b)} of the rectifying valve and the open state {the same figure (c)} at the position {the figure (a)} where the ratchet claw is engaged with the first locking claw are shown. It is sectional drawing. The open state of the rectifying valve {FIG. (B)} and the open state of the on-off valve {FIG. (C)} at the position {FIG. (A)} where the ratchet pawl is engaged with the second locking pawl are shown. It is sectional drawing. The open state of the rectifying valve {FIG. (B)} and the open state of the on-off valve {FIG. (C)} at the position {FIG. (A)} where the ratchet pawl is engaged with the third locking pawl are shown. It is sectional drawing. The open state of the rectifying valve {FIG. (B)} and the open state of the on-off valve {FIG. (C)} are shown at the position {FIG. (A)} where the ratchet pawl is engaged with the fourth locking pawl. It is sectional drawing. It is explanatory drawing which decomposes | disassembles and shows the operation | movement process of a ratchet nail | claw in seven steps of I-VII. It is a side view of the multistage locking mechanism provided with the retrograde prevention part of the preferable form. It is a perspective view which decomposes | disassembles and shows the component of the multistage latching mechanism of FIG. It is explanatory drawing which decomposes | disassembles and shows the operation process of the ratchet nail | claw in the multistage latching mechanism of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIGS. 1 to 3, the exemplary lever-type liquid ejecting apparatus 1 has a nozzle portion 3 at the distal end portion of a main body 2 having a grip portion 2 a.

  The main body 2 has a liquid supply path 4 extending in the axial direction therein, and a spray amount adjusting body that is opened and closed by an operation of a lever 5 attached to the main body 2 is provided in the liquid supply path 4.

  The spray amount adjusting body includes an on-off valve 6 and a rectifying valve 7 disposed downstream of the on-off valve 6 (the side where the nozzle portion is present is downstream).

  The rectifying valve 7 is a valve that opens and closes in conjunction with the opening / closing valve 6, and the opening degree of the rectifying valve 7 can be changed by changing the grip amount of the lever 5. The form of the jet water flow from the nozzle part 3 changes with the change of the opening degree.

  As shown in FIGS. 1 and 2, the main body 2 is connected to a cylindrical main cylinder 2b provided at the rear end with a grip portion 2a projecting obliquely rearward and downward so as to extend to the front end side of the main cylinder 2b. And a cylindrical holder 2c.

  The cylindrical rear part of the holder 2c is fitted on the small diameter part at the tip of the main cylinder 2b, and the main cylinder 2b and the holder 2c are concentrically coupled by a retaining ring 9 of the fitting part. The main cylinder 2b and the holder 2c Is a liquid supply path 4 communicating in the axial direction. The outside of the nozzle portion 3 provided at the tip of the holder 2c is covered with a hood 10.

  A flow path 11 provided in the grip portion 2a communicates with the liquid supply path 4 of the main cylinder 2b, and an on-off valve 6 is provided downstream of the junction of both paths. The rectifying valve 7 is provided in the liquid supply path 4 in the holder 2c.

  The on-off valve 6 is formed by combining a cylindrical valve seat 6a and a valve body 6b. The valve body 6b is provided at the tip of the hollow valve shaft 6c. The valve body 6b is brought into contact with and separated from the valve seat 6a to open and close the valve hole of the valve seat 6a, so that the liquid supply path 4 is connected to and disconnected from the flow path 11.

  A spring presser 12 is fitted on the hollow valve shaft 6c in a liquid-tight and slidable manner. The spring presser 12 is screwed in a liquid-tight manner to the main cylinder 2b so that the rear end of the liquid supply path 4 is sealed. Yes.

  The hollow valve shaft 6 c and the valve body 6 b of the on-off valve 6 provided on the shaft are always urged in the valve closing direction by a spring 6 d that is contracted between the spring presser 12.

  The lever 5 for operating the spray amount adjusting body is formed in a shape having a U-shaped section that is long in the vertical direction and having a clevis portion 5a at the upper end.

  As shown in FIGS. 2 and 3, the clevis portion 5a at the upper end of the lever 5 is inserted into the front of the grip portion 2a from the outside of the main cylinder 2b from below and is connected to a connecting portion 13 provided at the upper portion of the main cylinder 2b. They are connected by a connecting shaft 14.

  Thereby, the lever 5 can be rotated in a direction approaching or separating from the grip portion 2a with the connecting shaft 14 as a fulcrum.

  As shown in FIG. 3, a linkage 15 bent into a U-shape in plan view as shown in FIG. 3 is installed on the outside of the main cylinder 2b, and the left and right free ends of the linkage 15 are connected to a lever as shown in FIG. The clevis portion 5a is pivotally connected using a pin 16 near the upper end of the clevis portion 5a.

  Further, as shown in FIG. 1, a protruding portion from the spring retainer 12 of the hollow valve shaft 6 c is passed through a through hole provided in the rear end wall of the linkage 15, and the protruding portion is connected to the rear end wall of the linkage 15. It is connected.

  The connection is made by a connection point adjusting mechanism 8. The connecting point adjusting mechanism 8 shown in the figure has two lock nuts 8a and 8a threadedly engaged with a male screw on the outer periphery of the rear part of the hollow valve shaft 6c, and the two lock nuts 8a and 8a serve to connect the rear end wall of the linkage 15. It is sandwiched from the front and back.

  A pull shaft 18 is passed through the hole of the hollow valve shaft 6c in a fluid-tight and slidable manner, and an adjustment nut 17 for adjusting the valve opening amount of the rectifying valve 7 is attached to the rear end of the pull shaft 18. Has been.

  As shown in FIG. 1, a gap g is formed between the adjusting nut 17 and the rear end of the hollow valve shaft 6c by adjusting the screwing of the adjusting nut 17 when the on-off valve 6 is closed. In addition, by changing the size of the gap g, the relationship between the opening degree of the on-off valve 6 and the rectifying valve 7 can be adjusted.

  The linkage 15 connected to the lever 5 is held in a closed position where the valve body 6b of the on-off valve 6 is in contact with the valve seat 6a when the lever is not operated. Hold in the initial position where it will be in a drooping position.

  When the lever 5 is operated from this initial position and rotated to the grip 2a side, the hollow valve shaft 6c moves rearward while compressing the spring 6d, whereby the valve body 6b opens and closes away from the valve seat 6a. Valve 6 opens.

  When the hollow valve shaft 6c is further retracted from the position where the gap g becomes zero, the pull shaft 18 is pulled and the rectifying valve 7 is operated.

  As shown in FIG. 4, the rectifying valve 7 is provided with a rectifying plate 7a also serving as a valve seat in the middle of the liquid supply path 4 in the holder 2c, and the pulling valve 7 is located upstream of the rectifying plate 7a on the upstream side of the liquid supply path 4. The shaft 18 is incorporated so as to be movable in the axial direction, and a valve body (poppet) 7b for opening and closing the valve hole 7c of the rectifying plate 7a is provided at the tip of the pull shaft 18.

  The rectifying plate 7a is provided with a communication hole 7d (see FIG. 5) connected to a normally open spiral groove (not shown; this is provided in the rectifying core 3a) that generates a spiral flow. Further, the valve hole 7c of the rectifying plate 7a is formed with a recess 19 (see FIG. 5) formed on the inner periphery to avoid complete blockage by the valve body 7b, and the valve body 7b is closed. The liquid flow is generated by the recess 19 also when returning to the position and in contact with the current plate 7a.

  The valve body 7 b is attached to the tip of the pull shaft 18. The valve body 7b is attached with pins 20 projecting radially outward from both ends of the valve body 7b, and a spring 7e is contracted between the pin 20 and the main cylinder 2b, and the spring 7e. With this force, the valve body 7b is urged in the valve closing direction (forward), and the valve body 7b is pressed against the rectifying plate 7a.

  As described above, the spray amount adjusting body including the on-off valve 6 and the rectifying valve 7 includes the hollow valve shaft 6c separated from the pull shaft 18, and the movement of the hollow valve shaft 6c starts to move from the initial position. The rectifying valve 7 that opens and closes in synchronism with the on-off valve 6 is constructed by generating a timing shift and transmitted to the pull shaft 18 at the beginning, and when the on-off valve 6 is opened, the valve body 7b is connected to the rectifying plate. The state in contact with 7a can be maintained.

  The nozzle unit 3 inserts a cylindrical rectifying core 3a into the liquid supply path 4 downstream of the rectifying valve 7, and superimposes the ejection plate 3b on the flange at the tip of the rectification core 3a. It is structured to be fastened and fixed with a cap 3c screwed into the holder 2c.

  The rectifying core 3a is provided with the above-described normally open swivel groove (not shown), and a liquid is passed through the groove to generate a spiral flow that flows out of the jet plate 3b.

  The jet plate 3b has a conical shape protruding forward, and sprays or jets liquid from the nozzle hole 3d provided at the tip.

  The structures of the rectifying valve 7 and the nozzle portion 3 are described in detail in Japanese Patent Application Laid-Open No. 2008-110318.

  Between the grip part 2a and the lever 5, the multi-stage locking mechanism 21 that locks the lever 5 that has actuated the on-off valve 6 at a plurality of positions with different opening degrees of the on-off valve 6 and holds them at the respective locking positions. Is provided.

  The multistage locking mechanism 21 includes a plurality of locking claws 22, a ratchet claw 23 that can be engaged with and disengaged from each locking claw 22, and an elastic body that biases the ratchet claw in the locking direction (shown in the figure). It has a wire spring 24). The ratchet claw 23 of the prototype liquid ejecting apparatus is a resin molded product.

  The latching claw 22 is an example in which the front surface is an inclined surface with a front lowering and the rear surface is a standing surface with no inclination, and four mountains are arranged in front and back.

  The four locking claws 22 are arranged at substantially equal pitches, so that the lever-type liquid ejecting apparatus 1 in the illustrated lever-type liquid ejecting apparatus 1 has the latching claw 23 locked on the right side in FIG. The ejection angle of the liquid ejected from the nozzle unit 3 decreases as the distance goes to.

  FIGS. 9 to 13 show the latching position of the ratchet pawl 23 with respect to the latching claw 22 and the opening change state of the rectifying valve 7 and the on-off valve 6 at each locking position at this time. Details of the state of injection in these figures will be described later. 9 to 13 are diagrams in which the recess 19 of the rectifying plate 7a is omitted.

  The locking claws 22 may be three or four or more.

  Furthermore, the illustrated lever-type liquid ejecting apparatus 1 has a holding claw case 25 made of resin, which is processed separately from the main body 2, attached to the grip portion 2 a and a locking claw 22 is formed in the locking claw case 25. However, the locking claw 22 may be formed directly on the grip portion 2a.

  The ratchet pawl 23 is rotatably attached to the lever 5 using a support shaft (that is, a pin in the drawing) 26 that serves as a rotation fulcrum. The ratchet pawl 23 extends toward the grip portion 2a. A downward claw 23a is provided at the tip of the extended portion, and a stopper 23b for restricting its own return rotation is provided below the lever side end. Is provided.

  Further, a columnar slider 27 is provided on the upper end of the extended portion (see FIGS. 6 and 7). The slider 27 is provided so that a rib 28 having a narrower width than that of the extended portion is provided on the upper surface of the extended portion, and the upper end of the rib 28 protrudes from both sides of the rib to the left and right. Is formed integrally with the ratchet claw 23.

  The claw 23a is pushed up to the front lower front surface of the locking claw 22 when the lever 5 is gripped and operated in the direction in which the on-off valve 6 opens, overcoming the locking claw 22 while elastically deforming the elastic body 24. The elastic body 24 is lowered to the engagement point with the locking claw 22 by the elastic restoring force of the elastic body 24 and is held at the engagement position.

  By increasing the grip amount (rotation amount) of the lever 5, the engagement point of the ratchet claw 23 (claw 23a) with respect to the locking claw 22 becomes the second locking claw, the third locking claw, the fourth engagement. Move in the order of the claws.

  Further, when the lever 5 is further grasped from the position where the ratchet claw 23 is engaged with the fourth locking claw 22, the disengagement mechanism included in the multistage locking mechanism 21 is operated to ratchet the locking claw 22. The claw 23 is disengaged.

  The disengagement mechanism is a mechanism constituted by two members: a cam surface 29 formed on the ratchet claw 23 and a first locking claw 22.

  When the lever 5 is further grasped from the position where the ratchet claw 23 is engaged with the fourth locking claw 22, the first locking claw counted by the cam surface 29 from the lever side as shown in FIG. The ratchet pawl 23 rotates counterclockwise in FIGS. 1 and 14 when the lever 5 is further gripped as shown in FIG. 14 (II) by the action of the cam surface 29. To do.

  As a result, the ratchet claw 23 is detached from the fourth locking claw 22, and the slider 27 provided on the ratchet claw 23 is guided to the return path 30.

  The multistage locking mechanism 21 also includes a guiding mechanism that guides the slider 27 through the return path 30 to the initial position. The guide mechanism is a combination of a guide 31 provided on the gripping portion 2 a side above the locking claw 22, the slider 27, and a retrograde prevention portion 32 of the ratchet claw 23.

  The guide 31 is a plate-like member that is long in the front-rear direction, and a passage on the upper surface side of the guide 31 is a return path 30. The two guides 31 are arranged in parallel on two inner surfaces of the engaging claw case 25 facing each other, and the ribs 28 of the ratchet claw 23 pass between the two guides 31, 31. The slider 27 passes over the guide 31.

  The retrograde prevention portion 32 is configured by combining a slider 27, a moving path 33 through which the slider 27 passes, and a stopper 34 provided in the middle of the moving path in the longitudinal direction across the moving path 33. Yes.

  The stopper 34 has an outer peripheral surface having a convex arc shape in a side view, and the stopper 34 protrudes toward the guide 31 to narrow the width of the moving path 33 between the stopper 31. The apex (protrusion end) of the outer circumferential surface of the convex arc of the stopper 34 is at the start end side (on the locking claw 22) of the moving path 33 from the portion where the slider 27 contacts the stopper 34 at the position where the lever 5 is gripped to the maximum. It is arranged on the near side.

  The slider 27 comes into contact with the stopper 34 immediately before the gripping of the lever 5 becomes maximum (see (I) in FIG. 14). Then, it rides on the stopper 34 by further gripping the lever 5 {see (II) in FIG. 14}. In the guide mechanism of the embodiment, the ratchet pawl 23 is bent by the ride-up, and the stopper 34 is overcome by grasping the lever 5 until the end point of grasping (see (III) in FIG. 14).

  It is also possible to overcome this by providing play (gap) between the support shaft 26 and the ratchet claw 23 so that the ratchet claw 23 can move in the support shaft radial direction while elastically deforming the elastic body 24. When there is such play, when the slider 27 rides on the stopper 34, it can escape to the support shaft 26 side, and the escape can be overcome.

  The slider 27 that has passed over the stopper 34 is guided to the outer circumferential surface of the convex arc of the stopper 34 and guided to the return path 30 (see (IV) in FIG. 14).

  In the illustrated anti-reverse unit 32, when the slider 27 gets over the stopper 34, the ratchet pawl 23 is elastically restored and returns to its original shape. In order to allow the ratchet pawl 23 to escape by allowing play between the support shaft 26 and the ratchet pawl 23 to move over the stopper of the slider 27, the ratchet pawl 23 is moved to the stopper 34 side by using the force of the elastic body 24. Can be pushed back to.

  The ratchet pawl 23 in which the slider 27 has passed over the stopper 34 is prevented from becoming an obstacle and preventing the slider 27 from going over the stopper 34 in the reverse direction (the ratchet pawl 23 has an elastic restoring force of the spring). Thus, the ratchet pawl 23 is reliably prevented from reversing (reversing).

  When the lever 5 is released at the position where the slider 27 moves to the return path 30, the lever 5 is pulled back to the initial position side with the ratchet pawl 23 by the force of the spring 6d {(V) to (VII in FIG. )reference}. Therefore, the slider 27 of the ratchet pawl 23 returns through the return path 30, and the return of the lever 5 to the initial position closes the on-off valve 6 and returns to the spray stop state.

  The stopper 34 of the illustrated apparatus has a portion where the stopper is installed made of resin. Therefore, a metal round pin is implanted in the portion, and a part of the outer periphery of the round pin is moved along the moving path 33. It is exposed at the top and is composed of the exposed part, so it has excellent wear resistance and durability.

  The lever type liquid ejecting apparatus 1 according to the embodiment has the above-described configuration. FIG. 1 shows a state of the apparatus when the liquid is stopped without injecting the liquid. In the initial state where the ratchet claw 23 is not engaged with the locking claw 22, the on-off valve 6 is closed. In the rectifying valve 7, the valve body 7 b is pressed against the rectifying plate 7 a by the force of the spring 7 e. However, since the rectifying valve 7 has the recess 19 on the inner periphery of the valve hole, the liquid can pass through the recess 19. it can.

  However, since the liquid is not introduced into the liquid supply path 4 when the on-off valve 6 is closed, the spraying is stopped.

  Next, when the lever 5 is operated to lock the ratchet pawl 23 with the first pawl 22, the on-off valve 6 is opened. However, at this time, the valve body 7b of the rectifying valve 7 is still pressed against the rectifying plate 7a (see FIG. 10).

  For this purpose, the liquid that has flowed into the spiral groove of the rectifying core 3a via the communication hole 7d of the rectifying plate 7a and the liquid that has passed through the recess 19 in the inner periphery of the valve hole join together in the jet plate 3b. It diffuses widely from the nozzle hole 3d and is injected to the outside. The exemplary apparatus has an injection angle of about 70 ° at this time.

  The ejection angle is obtained by visually checking the diffusion state of the liquid ejected from the nozzle portion with the scale of the protractor disposed on the side (the same applies to the following). Since it is difficult to measure the exact angle, the measured value is rough.

  When the lever 5 is grasped and the ratchet claw 23 is locked to the second locking claw 22, the valve portion of the rectifying valve 7 is slightly opened. As a result, the flow rate of the straight flow (the liquid passing through the valve portion of the rectifying valve 7 becomes a straight flow) increases, and the spray angle of the liquid sprayed from the nozzle portion 3 changes to about 40 ° (see FIG. 11). ).

  Further, when the ratchet claw 23 is locked to the third locking claw 22, the opening amount of the rectifying valve 7 is increased, the flow rate of the straight flow is further increased, and the liquid injection angle is about 20 °. Change (see FIG. 12).

  Further, when the ratchet claw 23 is locked to the locking claw 22 on the fourth surface, it is directly irradiated (see FIG. 13).

  When the lever 5 is further grasped from the direct position, the ratchet claw 23 is disengaged from the locking claw 22 as described above, and the slider 27 of the ratchet claw 23 is moved to the position where the lever 5 is grasped to the maximum. Go over the stopper 34 and move to the return path 30.

  Thereafter, when the lever 5 is released, the lever 5 and the ratchet pawl 23 return to their initial positions and postures. Therefore, it is possible to switch the spray form and hold the switched spray form by operating the lever with one hand.

  As described above, in the exemplary liquid ejecting apparatus, the retrograde prevention of the ratchet pawl 23 is performed by the slider 27 provided on the ratchet pawl 23 and the stopper 34 provided on the moving path 33 of the slider, The moving element 27 has a structure in which the outer peripheral surface is in contact with the stopper 34 and gets over the stopper. Therefore, the requirements for simplification of the induction mechanism, simplification of assembly, and improvement of durability are satisfied.

FIGS. 15-17 is a specific example of the multistage latching mechanism provided with the retrograde prevention part of the preferable form.
The multistage locking mechanism 21 shown in FIGS. 6 to 8 bends the ratchet pawl 23 to displace the slider 27 in the direction away from the stopper 34, so that the slider 27 gets over the stopper 34 by the displacement. Therefore, the operating force of the lever 5 tends to increase.

  Further, the contact pressure acting on the contact portion between the slider 27 and the stopper 34 becomes high, and it is necessary to take measures against wear on the contact surface.

  The multistage locking mechanism 21 of FIGS. 15 to 17 eliminates these problems. In the multistage locking mechanism 21 shown in FIGS. 15 to 17, a stopper 34 is detachably attached to a recess 25 a provided inside the main body 2 (the locking claw case 25 attached to the main body is shown).

  The stopper 34 includes a slope 34 b that generates a component force that pushes the stopper 34 in the immersion direction at the slider contact portion when the slider 27 moves toward the return path 30. The slope 34b shown in the figure is created by arranging the stopper 34 in an inclined manner.

  Further, the retrograde preventing portion 32 includes a spring 35 that urges the stopper 34 in a direction protruding from the concave portion 25a of the locking claw case.

  In the illustrated structure, the stopper 34 is inserted into the recess 25a by providing a support shaft 34a at one end of the stopper 34 and rotating the stopper 34 around the support shaft so that the other end of the stopper 34 is placed in the recess 25a. Although it is made by the method of entering, if it is provided with the slope 34b, it may be a stopper that advances and retreats in the biasing direction by the spring 35 and enters the recess.

  In the lever-type liquid ejecting apparatus including the multistage locking mechanism 21 shown in FIGS. 15 to 17, the slider 27 gets over the stopper when the stopper 34 is immersed in the main body 2.

  The operation stroke of the ratchet claw at that time is shown in FIG. The slider 27 comes into contact with the stopper 34 before the grip of the lever 5 reaches the maximum (see (I) in FIG. 17). Then, when the lever 5 is further gripped, the stopper 34 is immersed in the recess 25a with a component force acting on the contact portion with the inclined surface 34b {see (II) in FIG. 17}.

  The stopper 34 is pushed out of the recess 25a by the spring 35 at that stage where the lever 5 is moved over the stopper 34 at the position where the grip of the lever 5 is maximized (see (III) in FIG. 17).

  Thereafter, the slider 27 is prevented from going backward by the stopper 34 and is guided to the return path 30 in this state {see (IV) in FIG. 17}.

When the grip of the lever 5 is released at the position where the slider 27 moves to the return path 30, the lever 5 is returned to the initial position side with the ratchet pawl 23 by the force of the spring 6d {(V) to ( See VII)}.
Thus, the lever 5 returns to the initial position, the on-off valve 6 is closed, and the spraying is stopped.

  In the lever type liquid ejecting apparatus provided with the multistage locking mechanism 21 of FIGS. 15 to 17, the slider 27 smoothly gets over the stopper 34 without bending the ratchet pawl 23.

  Further, since the stopper 34 is immersed in the main body and escapes, a large frictional force is not generated at the contact portion between the slider 27 and the stopper 34, and the contact surface is not easily worn or deformed.

  Reference numeral 36 in FIG. 15 denotes a flexible cover that closes the outlet of the return path 30 provided in the locking claw case 25. The cover 36 functions to prevent foreign substances from entering the return path 30, but is not an essential element of the present application.

DESCRIPTION OF SYMBOLS 1 Lever type | mold liquid injection apparatus 2 Main body 2a Grasp part 2b Main cylinder 2c Holder 3 Nozzle part 3a Flow control core 3b Injection plate 3c Cap 3d Injection hole 4 Liquid supply path 5 Lever 5a Clevis part 6 On-off valve 6a Valve seat 6b Valve body 6c Hollow valve shaft 6d Spring 7 Rectifier valve 7a Rectifier plate 7b Valve body 7c Valve hole 7d Communication hole 7e Spring 8 Rolling point adjusting mechanism 8a Lock nut 9 Retaining ring 10 Hood 11 Flow path 12 Spring retainer 13 Connecting portion 14 Connecting shaft 15 Link 16 Pin 17 Adjustment nut 18 Pull shaft 19 Recess 20 Pin 21 Multi-stage locking mechanism 22 Locking claw 23 Ratchet claw 23a Claw 23b Stopper 24 Elastic body 25 Locking claw case 25a Recess 26 Support shaft 27 Slider 28 Rib 29 Cam surface 30 Return path 31 Guide 32 Anti-reverse portion 33 Moving path 34 Stopper 34a Support shaft 3 Cover g clearance b slopes 35 spring 36 flexible

Claims (4)

The spray amount adjusting body incorporated in the main body (2) is operated by a lever (5) attached to the main body, and the form of the jet water flow from the nozzle portion (3) at the front end of the main body is changed according to the grip amount of the lever. , A plurality of locking claws (22) provided on the grip portion (2a) of the main body, a ratchet claw (23) rotatably attached to the lever (5), and the ratchet claw ( 22) The lever (5) is moved by the ratchet pawl (23) and the locking pawl (22) by a multi-stage locking mechanism (21) combined with an elastic body (24) biased in the direction of engagement with the locking pawl (22) A lever-type liquid ejecting apparatus that holds in stages at positions that are respectively locked to each of the
An engagement release mechanism for releasing the engagement of the ratchet pawl (23) with the locking pawl (22) at a position where the multi-stage locking mechanism (21) grips the lever (5) to a maximum grip amount; A combination of a guiding mechanism for guiding the ratchet claw (23), which has been disengaged from the locking claw (22), to the initial position through the return path (30),
The guide mechanism includes a guide (31) provided on the side of the gripper so as to be parallel to the locking claw (22) above the locking claw (22), and a slider provided on an upper end of the ratchet claw (23). (27) and the retrograde prevention part (32) of the ratchet claw (23) provided on the grip part (2a) side are included,
The anti-reverse unit (32) includes a moving path (33) through which the slider (27) passes, and a stopper (34) provided in the moving path so as to cross the moving path in the width direction. The slider (27) is guided to the return path (30) over the stopper (34) while contacting the outer periphery with the stopper (34) at the position where the grip (5) is gripped to the maximum. 34) A lever-type liquid ejecting apparatus configured to prevent the backward movement of the slider (27) from a position over the position 34) by the stopper (34).   The stopper (34) is detachably attached to the main body (2), and the stopper (34) slides when the slider (27) moves toward the return path (30). A spring (35) for urging the stopper (34) in a direction protruding from the main body (2) is provided with a slope (34b) for generating a component force that pushes the stopper (34) in the immersion direction at the moving part contact portion. The lever type according to claim 1, wherein the lever type is included in the retrograde prevention part (32), and is configured such that the stopper (34) gets over the stopper (34) with respect to the main body (2). Liquid ejector.   The stopper (34) is composed of a metal round pin implanted in the main body (2) so that an outer peripheral surface of a convex arc in a side view projects into the moving path (33), and the slider ( 27) The lever-type liquid ejecting apparatus according to claim 1, wherein 27) is guided to the outer peripheral surface of the convex arc when viewed from the side, and is guided to the return path (30) over the stopper (34).   The lever-type liquid ejecting apparatus according to claim 3, wherein the ratchet pawl (23) is configured to bend itself and get over the stopper (34).

Images