JPH09158916A - Stepped extending/contracting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make multistep extension/contraction capable by only pressing of single operation. SOLUTION: Contracting action is performed by pressing an outer side slider 1 or inner side slider 2 against energizing force of an extension direction energizing means 5. In the case of a relative slide between both the sliders 1, 2 in this contraction direction, stepped contraction can be performed by engaging a lock pawl 3 successively with lock recessed parts 6a to 6d. On the other hand, in extension action, the slider is further pressed in a condition contracted to the shortest condition. In this way, an engaging disabling guide part 7 functions, the lock pawl is placed in a disengageable condition, this condition is maintained by locking of the lock pawl to a lock receiving protrusion 13, and during this time, by energizing force of the extension direction energizing means, a slide in an extension direction is automatically performed to the longest condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic mechanism that can be used as, for example, a mechanism for opening / closing a ventilation path of a ventilation device or a mechanism for adjusting the height of a headrest provided on a seat of a vehicle.

[0002]

2. Description of the Related Art For example, as Japanese Utility Model Publication No. 6-12470,
A retractable mechanism for retracting and retracting, which is used to operate the ventilation passage opening / closing member of a ventilation device, is known.
No. 9762 discloses a slide mechanism that can also be used as a telescopic mechanism. The telescopic mechanism in Japanese Utility Model Publication No. 6-12470 can be moved in and out by a one-touch operation that is just a push, and is excellent in operability. However, it is difficult for this mechanism to have a multi-stage stretchable structure, that is, a structure in which the length is changed stepwise, and the functionality is limited.
On the other hand, the slide mechanism in Jitsuko Sho 63-9762
Although it is possible to expand and contract in multiple stages, it is necessary to externally operate in both the extension direction and the contraction direction. For example, the ventilation device disclosed in Japanese Utility Model Publication No. 6-12470,
Alternatively, the operability is difficult to use for a device such as a headrest of an automobile, which is easy to push but difficult to pull.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object thereof is to provide a telescopic mechanism which can be operated by a one-touch operation of pushing multi-step telescopic operation.

[0004]

SUMMARY OF THE INVENTION The stepwise expansion / contraction mechanism according to the present invention is an outer slider having a plurality of locking recesses arranged in the length direction at predetermined intervals and sliding inside the outer slider. The inner slider and the inner slider, which are combined as much as possible, are engaged with any of the plurality of locking recesses of the outer slider when the inner slider and the outer slider slide in the direction of contraction relative to each other. A locking claw that provides a locked state, a locking biasing means that biases the locking claw in the locking direction, and a locking claw that is locked in a certain locking recess when sliding in the contraction direction. Engagement releasing means for releasing the engaged state from the engaged state to the other engaging recessed portion, immovable state imparting means for imparting a state in which the engaging claw cannot be engaged with the engaging recessed portion, and this engaging state Granted by means of immobilization The unengageable state maintaining means for maintaining the unengageable state, the unengageable state releasing means for releasing the unengageable state maintained by the unenableable state maintaining means, and the inner slider and the outer slider. It is provided with an extension direction urging means for applying an urging force for sliding in the extension direction opposite to the contraction direction slide.

The contraction operation of the stepwise expansion / contraction mechanism is performed by pressing the inner slider or the outer slider against the urging force of the extension direction urging means to cause the slide in the contraction direction relative to both sliders. When sliding in the contraction direction, the locking claws are sequentially engaged in the plurality of locking recesses in the arrangement direction of the locking claws, thereby enabling stepwise contraction. On the other hand, the extension operation is performed by the urging force of the extension direction urging means after contracting to the shortest state. To be more specific, when it is pushed further in the state where it is contracted to the shortest, that is, when the locking claw is locked in the last locking recess, the non-engagement state imparting means functions and the locking claw moves into the locking recess. The state becomes unengageable, and this state is maintained by the unengageable state maintaining means. During this period, the extension direction slides automatically to the longest state by the urging force of the extension direction urging means. Then, when it reaches the longest state, the non-engageable state releasing means releases the non-engageable state of the locking claw, and the stepwise contraction can be performed again.

As described above, in the stepwise expansion / contraction mechanism according to the present invention, the expansion / contraction operation can be performed by a one-touch operation by simply pressing one of the sliders. Even if the pressing operation is easy, the pulling operation is difficult. It has excellent suitability as a mechanical element such as a device.

Regarding the stepwise expansion and contraction mechanism as described above,
Two types are possible from the mode of operation in which the locking claw engages with and disengages from the locking recess. One of them is a rotating type, and the other is a sliding type.

Regarding the rotation type, the outer slider has a structure in which a pressing contact receiving surface is provided on the side opposite to the side where the locking recess is provided, and the locking claw has a claw on the tip side and a base end. Side push-contact portions are provided respectively, and the push-fit portions are rotatably assembled to the tip end portion of the inner slider via a rotary shaft that supports an intermediate position between the claw portion and the push-contact portion. In the engaged state, the pressing portion is pressed against the pressing contact receiving surface of the outer slider so that the inner slider and the outer slider are locked.

On the other hand, in the case of the slide type, the locking claws are slidable in a direction intersecting with the sliding directions of both the inner and outer sliders and attached to the tip of the inner slider, and the front claws are slid forward. It is possible to employ a structure in which the portion engages with the locking recess of the outer slider to provide a locked state between the inner slider and the outer slider.

As the engaging urging means, a twisting spring or a tension spring is used for the rotation type locking claw, and the direction in which the claw part is engaged with the locking claw by the spring is used. The sliding pawl has a structure such that a compression spring is used for the locking pawl, and one end of the spring is abutted against the pawl and the other end is abutted against the inner slider or the outer slider. In addition, the claw portion is configured to apply a slide biasing force in a direction in which the claw portion engages with the locking recess.

Further, the engagement releasing means is formed as an engagement releasing surface provided on the claw portion of the engaging claw, and when the inner slider or the outer slider is pushed, the engaging releasing surface is the inner surface of the engaging recess. Alternatively, the structure in which the locking claw is rotated in the direction of separating from the locking recess by the component force generated by pressing against the edge (in the case of a rotating type locking claw) or the structure is slid (in the case of a slide type locking claw) If).

The non-engagement state imparting means is formed as a non-engagement guide portion provided on the outer slider at a position where the locking recesses are arranged in an extended position, and is further pushed by the inner slider or the outer slider in a state of being contracted to the shortest. Structure in which the locking claw is rotated to a predetermined state in the non-engagement direction by a component force generated by the locking claw being pressed against the engagement disabling guide portion when the lock is engaged. Or in the case of a sliding type locking claw).

In the case where the locking claw is of a rotating type, the non-engageable state maintaining means is formed by a combination of a locking receiving part provided on the inner slider and a locking part provided on the locking claw. A structure in which the locking portion of the locking claw locks on the lock receiving portion of the inner slider in a state in which the locking portion of the locking claw regulates the biasing by the locking biasing means by the rotation of the disabling guide portion to a predetermined state. To do.

The non-engageable state releasing means corresponding to the non-engageable state maintaining means is provided on the outer slider at the position where the engaging recesses are arranged on the opposite side of the guide for disengaging engagement. It is formed as a guide portion for releasing the unengageable state, and when the longest state is reached by the urging force of the extension direction urging means, the engaging claw is pressed against the guide portion for releasing the unengageable state, so that The structure is such that the locked state is released by rotating.

On the other hand, when the locking claw is of the slide type, there are two types of means for maintaining the unengageable state. One of them is formed by a combination of a lock receiving part provided on the inner slider and a lock part provided on the locking claw, and is engaged by sliding the locking claw to a predetermined state by the engagement disabling guide part. It is a structure that locks the locking claw into a non-engageable state by locking the locking part to the locking receiving part.

The non-engageable state releasing means corresponding to the non-engageable state maintaining means is formed as a non-engageable state releasing guide portion provided on the side of the outer slider opposite to the side where the locking concave portion is provided, and extends in the extending direction. When the longest state is brought about by the urging force of the urging means, the locking claw is locked to the locking receiving part by the component force generated when the locking claw is pressed against the unlocking release guide part. The structure is such that the locking claw is slid in the engaging direction while being released.

Another one of the non-engageable state maintaining means when the locking claw is a slide type is a guide groove provided on the outer slider with a structure in which the first guide path and the second guide path are connected in a loop shape. It is formed by a combination of guide portions provided on the locking claws, and the guide portion is guided by the first guide path when the locking claws can be engaged with the locking recesses. When the locking claw slides to a predetermined state, the guide part is in a state of being guided by the second guide path so that the locking claw cannot be engaged.

The unengageable state maintaining means also functions as unengageable state releasing means. That is, as described above, when the locking claws cannot be engaged, the two sliders slide relative to each other up to the longest state, and the guide portion is again moved by the urging force of the engaging urging means. Then, the locking claw is ready to be engaged.

The gradual expansion / contraction mechanism as described above is suitable as a mechanical element of a ventilation device or the like as described above. For example, in order to use these as an operating means of a ventilation device provided with an air passage member and an opening degree adjusting member for adjusting the opening degree of the air passage of the air passage member, the air passage member is attached to either the outer slider or the inner slider. An opening adjustment member is connected to each of the remaining sliders, and the opening adjustment member is operated by utilizing the expansion and contraction of the two sliders relative to each other.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first embodiment of the present invention, as shown in FIGS. 1 to 8, the stepwise expansion / contraction mechanism includes an outer slider 1, an inner slider 2, a locking claw 3, and an engaging biasing means 4. , And the extension direction urging means 5 as main elements.

The outer slider 1 is formed in a rectangular tube shape with one end closed as shown in the figure, or in a cylindrical shape. Then, the locking recess 6 (6a to 6d) is provided on one side surface thereof.
Are arranged in the length direction at a predetermined interval according to the intended number of expansion and contraction steps. In addition, on the locking recess forming surface, in the extension direction, in one extension of the locking recess 6 in the arrangement direction, more specifically, at a position continuous with the edge of the locking recess 6d at one end. An engaging disabling guide portion 7 (FIG. 2) is provided for the disengageable state imparting means as an ascending slope, and more specifically, on the other extension of the locking recess 6 in the arrangement direction. A non-engagement releasing guide portion 8 is provided at a position close to the edge of the locking recess 6a at the other end. On the other hand, a pressing contact receiving surface 9 is provided on the side surface facing the locking recess forming surface.

The inner slider 2 is formed by providing an outer shape that is slidably slidable in the inner space of the outer slider 1. The inner slider 2 is provided with a locking pawl assembling portion 11 for mounting a locking pawl 3 which will be described later on the tip end side thereof, and a compression coil spring which forms an extension direction urging means 5 described later on the base end side thereof. A spring incorporating portion 12 for incorporating 5s is provided. In addition, the locking claw built-in portion 11 is provided with locking receiving projections 13 on both the left and right sides for the locking receiving portions of the non-engageable state maintaining means (FIG. 7). The lock receiving projection 13
As shown in the example of the drawing, it is supported by a leaf spring-shaped spring portion 13s and is elastically retractable in a direction intersecting with a rotation direction of a locking claw 3 described later, or a fixed structure. To do.

The locking claw 3 is provided with a claw portion 14 on the distal end side and a pressing contact portion 15 on the proximal end side. The locking portions 16 forming the means are formed so as to project on both left and right sides (FIG. 7), and the rotating shaft 17 is provided at an intermediate position between the claw portion 14 and the pressing contact portion 15.
It is rotatably incorporated into the engaging claw incorporating portion 11 of the inner slider 2 via. When the lock receiving projection 13 has a fixed structure as described above, the lock portion 16 has an elastically deformable structure. Further, the claw portion 14 is provided with an engagement releasing surface 18 serving as engagement releasing means.

The engaging and biasing means 4 is formed of a pair of torsion coil springs 4s and 4s (FIG. 7) as shown in the figure, or as a tension coil spring as another example,
The pawl portion 14 is incorporated so as to apply a rotational urging force in a direction in which the pawl portion 14 engages with the locking concave portion 6 to the locking pawl 3.

The extension direction urging means 5 has a structure in which one end of the compression coil spring 5s incorporated in the spring incorporating portion 12 of the inner slider 2 is supported by a spring supporting portion 20 fixed to the outer slider 1. As a supporting end, it is formed so as to apply a biasing force to the inner slider 2 to the outer slider 1 so as to slide in the extension direction in the expansion and contraction operation described later.

The expansion / contraction operation of the stepwise expansion / contraction mechanism according to the first embodiment is performed as follows. First, as a general operation, the outer slider 1 and the inner slider 2 are slid forward (arrow X in FIG. 1 for the outer slider 1 and arrow Y in FIG. 1 for the inner slider 2) or retracted (for the outer slider 1, outer slider 1). The arrow V in FIG. 1 and the arrow W in FIG. 1 with respect to the inner slider 2 are relatively expanded and contracted so that they are contracted by the forward slide and expanded by the backward slide.

Next, as a concrete operation, the state of FIG. 1 is the shortest contracted state, and in this state, the claw portion 14 of the locking claw 3 is engaged with the locking recess 6d at the end on the forward slide side. It is included. When the claw portion 14 of the locking claw 3 is engaged with the locking recess 6, the pressing contact portion 15 of the locking claw 3 is pressed against the pressing contact receiving surface 9 of the outer slider 1 so as to bulge. By this pressing and the engagement of the claw portion 14 with the engagement recess 6, the extension direction slide is regulated against the urging force of the extension direction urging means 5, and a constant length is maintained.

When the outer slider 1 or the inner slider 2 is pushed in the forward sliding direction from this state, the claw portion 14 is pressed against the engagement disabling guide portion 7 continuous with the edge of the locking recess 6 (see FIG. 2) The locking claw 3 is rotated in the non-engagement direction by the component force of the pressing force generated thereby. This rotation is performed by the locking claw 3
The locking portion 16 of the lock receiving projection 1 is moved to an angle over which the locking receiving projection 13 is retracted, and after the locking portion 16 is overridden, the locking receiving projection 1 is controlled in a state in which the rotational biasing by the engaging biasing means 4 is restricted.
3 (Fig. 2). In this state, the pressing portion 15 of the locking claw 3 also floats from the pressing receiving surface 9. Therefore, there is no element that regulates the urging force of the extension direction urging means 5, and both sliders 1 and 2 slide backward by the urging force of the extension direction urging means 5 and extend to the longest state.

When the locking claw 3 reaches the maximum length, the locking claw 3 presses against the disengageable unlocking guide portion 8, and the locking claw 3 rotates in the locking direction by this pressing. This rotation is such that the locking portion 16 of the locking claw 3 moves over in the direction opposite to the above while the locking receiving projection 13 is retracted therein, and as a result, the locking claw 3 is engaged. The first locking recess 6 by the biasing force of the biasing means 4
Engage in a and keep the length accordingly (Fig. 4). When the outer slider 1 or the inner slider 2 is pushed in the forward sliding direction in this state, the engagement release surface 18 of the claw portion 14 is locked by the engaging recess 6
The locking claw 3 is rotated by the component force of the pressing force generated by pressing against the inner surface of a, and the claw portion 14 is disengaged from the locking concave portion 6a (FIG. 5), and at the same time, the locking claw 3 is clawed. The part 14 is engaged with the adjacent locking recess 6b, and a length corresponding to this is obtained (FIG. 6).

The stepwise expansion / contraction mechanism according to the second embodiment of the present invention is as shown in FIGS. 9 and 10. In this embodiment, the locking claw 21 is provided with a locking portion 22 having a stepped structure as shown in FIG. 10, and at the same time, the locking portion 22 cooperates with the locking portion 22 to form a non-engageable state maintaining means. The lock receiving body 23 is used as the receiving portion and the lock claw incorporating portion 11 of the inner slider 2 is used.
To be installed. The lock receiving body 23 is formed in a clip shape by using a plate material having a spring property, and has a structure in which a constricted portion 23c is provided between a trapezoidal portion 23a on the base end side and an expanded portion 23b on the distal end side. Then, when the locking claw 21 is rotated to the state shown by the chain double-dashed line by pressing the locking disengagement guide portion 7, the locking portion 22 spreads out the constricted portion 23c of the locking receiving body 23. By being held in this way, the non-engageable state is maintained. The locking portion 22 and the locking receiving body 23 can be combined in the opposite way. That is, the locking portion of the locking claw is formed in the same clip shape as the locking receiving body 23, and the locking portion 2
The same lock receiving part as 2 is formed in the lock claw built-in part. The other structures and expansion / contraction operations in this embodiment are the same as those in the first embodiment, and therefore common parts are denoted by the same reference numerals and the description thereof is omitted.

According to the third embodiment of the present invention, the stepwise expansion / contraction mechanism has a structure as shown in FIGS. Also in this form, as in the first embodiment, the outer slider 3
1, inner slider 32, locking claw 33, engagement urging means 3
4 and the stretching direction urging means (not shown) are the main elements.

The outer slider 31 is basically similar to the first embodiment in that it has locking recesses 35 (35a, 35b, 35).
A corner provided with a plurality of c) and provided with an engagement-disabled guide portion 36 for the engagement-disabled state imparting means and an engagement-disabled release guide portion 37 (FIG. 16) for the engagement-disabled state releasing means. It has a cylindrical structure, and the portion that was the pressing contact receiving surface 9 of the outer slider 1 in the first embodiment is used as the base end regulating surface 38 of the locking claw 33 described later.

Similar to the inner slider 32 in the first embodiment, the inner slider 32 is provided with a locking pawl mounting portion 40 for mounting the locking pawl 33 on the tip end side thereof, and the first end on the base end side thereof. In the structure described above, a spring incorporating portion 41 for incorporating a compression coil spring (not shown), which is the same as the extension direction urging means, is provided. A guide groove 42 is provided on each of the left and right inner surfaces of the engaging portion 40 for assembling the locking claw (FIGS. 16 and 17), and a locking receiving body 43 is provided as an locking receiving portion at the end thereof. The lock receiving body 43 is
As in the case of the second embodiment, a spring-like plate material is used to form a clip, and a constricted portion 43c is provided between a circular portion 43a on the proximal end side and an expanded portion 43b on the distal end side. To do.

The engaging claw 33 is provided with an engagement releasing surface 44 serving as an engagement releasing means and has a wedge-shaped claw portion 45 at the tip, and a notch portion 46 at the base end side, and further a notch portion. Four
The inner slider 3 has a structure in which locking projections 47 are provided on both the left and right sides as a locking portion that is adjacent to 6 and cooperates with the locking receiving body 43 from the side surface to form the non-engageable state maintaining means.
It is incorporated in the engaging claw incorporating portion 40 of No. 2 so as to be slidable as shown by the arrow S.

The engaging urging means 34 is formed of a compression coil spring, and the engaging urging means 34 is incorporated so as to apply a sliding urging force in a direction in which the claw portion 45 is engaged with the engaging recess 35 to the engaging claw 33.

The overall operation in the expansion / contraction of the stepwise expansion / contraction mechanism according to the third embodiment is similar to that of the above-described first embodiment. As for the specific operation, it is assumed that the operation is started from the shortest contracted state shown in FIG. 14, and in this state, the locking claw 33 is provided in the locking recess 35c at the end on the forward slide side.
Claw portion 45 of the first embodiment is engaged, and the extension direction is opposed to the urging force of the extension direction urging means (not shown) similar to the extension direction urging means 5 shown in FIG. 1 relating to the first embodiment. The slide is regulated and keeps a certain length.

When the outer slider 31 or the inner slider 32 is pushed in the forward sliding direction from this state, the locking recess 35 is formed.
The claw portion 45 is pressed against the engagement disabling guide portion 36 that is continuous with the edge of c, and the locking claw 33 slides in the non-engagement direction by the component force of the pressing force generated thereby (FIG. 15). . This slide is performed until the locking projection 47 of the locking claw 33 is held in the locking receiving body 43 of the inner slider 32 by spreading the locking projection 47, and at the same time, the base end of the locking claw 33 is regulated at the base end. It comes into contact with the surface 38. As a result, there is no element that regulates the urging force of the extension direction urging means, and both sliders 31 and 32 slide backward by the urging force of the extension direction urging means and extend to the longest state shown in FIG.

When the locking claw 33 reaches the maximum length, the locking claw 33 presses against the disengageable unlocking guide portion 37, and the locking claw 33 slides in the locking direction due to the component force of the pressing force generated by this pressing. The locking protrusion 47 comes out of the locking receiver 43 (FIG. 16). As a result, the locking claw 33 is engaged with the engaging biasing means 3.
The urging force of 4 engages with the locking recess 35a, and the length corresponding to this is maintained. When the outer slider 31 or the inner slider 32 is pushed in the forward sliding direction in this state, the engaging claw is generated by the component force of the pressing force generated by the engagement release surface 44 of the claw 45 pressing the inner surface of the engaging recess 35a. 33 slides,
The claw 45 is disengaged from the locking recess 35 (FIG. 17), and the locking claw 33 moves the claw 45 to the adjacent locking recess 35b.
The length corresponding to this is obtained.

According to the fourth embodiment of the present invention, the stepwise expansion / contraction mechanism has a structure as shown in FIGS. 18 to 20, and like the above embodiments, the outer slider 51, the inner slider 52, and the locking claws. 53, the engagement biasing means 54, and the extension direction biasing means 55 are the main elements.

The outer slider 51 has a locking recess 56 (56).
a, 56b, 56c) and a disengagement disabling guide portion 57 for the disengageable state imparting means, guide grooves 58 are provided on both left and right sides for the disengageable state imparting means. The structure will be changed. The guide groove 58 has a structure in which the first guide path 58a and the second guide path 58b are connected in a loop shape.

The inner slider 52 has a structure in which a locking claw incorporating portion 60 for incorporating the locking claw 53 is provided at the tip thereof.

The locking claw 53 has a structure in which an engaging release surface 61 serving as an engaging release means is provided and a wedge-shaped claw portion 62 is provided at the tip and a guide hole 63 elongated in the front-rear direction is provided at an intermediate portion. And Then, the outer side surface is slidably attached to the engaging claw assembling portion 60 of the inner slider 52, and the guide receiving shaft 64 is passed through the guide hole 63 for the guide portion. It is supported by the guide groove 58 of the slider 51.

The extension direction urging means 55 includes a compression coil spring 55s and a tip end surface of the inner slider 52 and the outer slider 51.
The structure is sandwiched between the base end surface of

The overall operation in the expansion / contraction of the stepwise expansion / contraction mechanism according to the fourth embodiment is the same as in the above-described first and third embodiments. The specific operation is to operate from the longest extended state shown in FIG. 18, and in this state, the locking recess 5 at the end on the backward slide side.
The claw portion 62 of the locking claw 53 is engaged with the 6a, and the extension direction slide is restricted against the urging force of the extension direction urging means 55 to maintain a constant length.

When the outer slider 51 or the inner slider 52 is pushed in the forward sliding direction from this state, the engagement releasing surface 61 is pressed against the inner surface of the locking recess 56a, as in the second embodiment. The locking claw 53 slides due to the component force of the generated pressing force, and the claw portion 62 disengages from the locking recess 56a, and at the same time, the locking claw 53 engages the claw portion 62 with the adjacent locking recess 56b, A length corresponding to this is obtained. During this time, the guide receiving shaft 64 is guided by the first guide path 58a of the guide groove 58.

When the pawl portion 62 of the engaging pawl 53 is further engaged with the engaging concave portion 56c at the end on the forward slide side in this way, when further pushing is continued to the edge of the engaging concave portion 56c. The claw portion 62 is pressed against the engaging disabling guide portion 57, and the locking claw 53 slides in the non-engagement direction due to the component force of the pressing force generated thereby, and the guide receiving shaft 6 accordingly.
4 moves to the second guide path 58b of the guide groove 58. In this state, the end of the guide hole 63 is restricted by the guide receiving shaft 64, and the locking claw 53 is restricted from sliding in the engaging direction. Therefore, there is no element that regulates the urging force of the extension direction urging means 55, and both sliders 51 and 52 slide backward by the urging force of the extension direction urging means 55, extend to the longest state, and return to the state of FIG. .

Next, an embodiment of the ventilation device according to the present invention will be described. The ventilator according to one embodiment is shown in FIG.
1, the air passage member 71, the opening degree adjusting member 72,
The actuating means 73 formed by the stepwise expansion and contraction mechanism according to the first embodiment is the main element.

The air passage member 71 is formed in the shape of a short cylinder whose inside is an air passage, and is provided at its tip with a frame 74 that is decoratively bent. On the other hand, the opening adjustment member 72 has a structure including a tubular portion 76 having a plurality of ventilation openings 75 formed on the side surface, a decorative face portion 77, and a connecting portion 78 protruding from the center of the face portion 77. Then, the opening adjusting member 72 is slidably fitted to the air passage member 71, and both members are connected by the operating means 73.

In this ventilator, when the opening adjusting member 72 is pushed as indicated by the arrow X, the operating means 73 expands and contracts stepwise as described above, and accordingly the ventilation opening 75 of the opening adjusting member 72 is opened. The ventilation passage member 71 is closed, or the closed state is released, and the opening degree of the ventilation passage in the ventilation passage member 71 is adjusted accordingly.

As shown in FIG. 22, a ventilator according to another embodiment similarly includes a ventilation path member 81 and an opening degree adjusting member 8.
2 and the actuating means 83 formed by the stepwise expansion and contraction mechanism according to the first embodiment are the main elements.

The ventilation path member 81 is formed in the same manner as the ventilation path member 71 in the above embodiment. On the other hand, the opening adjustment member 82 is formed in a lid shape that covers the tip of the air passage member 81. Then, the opening degree adjusting member 82 is connected to the ventilation path member 81 by a hinge connection, and both members are connected by the operating means 83. This connection is performed by the opening adjusting member 82 and the operating means 83.
It is in a state that allows play such as arrow Y.

In this ventilator, when the opening adjusting member 82 is pushed as indicated by arrow Z, the operating means 83 expands and contracts in stages,
Along with this, the opening angle of the opening adjustment member 82 changes, and the opening of the ventilation passage in the ventilation passage member 81 is adjusted accordingly.

[0053]

As described above, the stepwise expansion / contraction mechanism according to the present invention can be carried out by a one-touch type operation that only pushes multi-step expansion / contraction. For example, even if it is easy to perform the pushing operation like a ventilation device, it is pulled. This can contribute to improving the functionality of mechanical elements such as devices that are difficult to operate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a stepwise expansion / contraction mechanism according to a first embodiment in a contracted state at a shortest length.

FIG. 2 is a reduced cross-sectional view in a state where the state of FIG. 1 is about to be extended.

FIG. 3 is a reduced cross-sectional view showing a state where the state of FIG. 2 is being extended.

FIG. 4 is a reduced cross-sectional view of the state of the longest stretched state following the state of FIG.

FIG. 5 is a reduced cross-sectional view showing a state in which the state of FIG. 4 is to be reduced by one step.

FIG. 6 is a reduced cross-sectional view showing a state in which the state of FIG.

7 is a diagram of the inner slider DA in FIG. 4 in the state of FIG. 4;
The side view including the partial fracture | rupture seen from the direction.

8 is a view of the stepwise expansion and contraction mechanism D in FIG. 4 in the state of FIG.
The side view containing the partial fracture | rupture seen from the A direction.

FIG. 9 is a sectional view of the stepwise expansion / contraction mechanism according to the second embodiment in a state in which the expansion / contraction mechanism is contracted to a minimum length.

FIG. 10 is a partially enlarged view seen from the direction of arrow DB in FIG.

FIG. 11 is a cross-sectional view of a main part of the stepwise expansion / contraction mechanism according to the third embodiment in a contracted state at the shortest length.

12 is a sectional view taken along the line SA-SA in FIG.

13 is a cross-sectional view taken along the line SB-SB in FIG.

FIG. 14 is a sectional view of the stepwise expansion / contraction mechanism according to the third embodiment in a state in which the expansion / contraction mechanism is contracted to a minimum length.

FIG. 15 is a cross-sectional view in a state in which it is about to extend from the state of FIG.

FIG. 16 is a cross-sectional view showing a state in which the state is extended to the longest next to the state shown in FIG.

FIG. 17 is a cross-sectional view showing a state in which the state of FIG. 16 is about to be reduced by one step.

FIG. 18 is a cross-sectional view of essential parts of the stepwise expansion / contraction mechanism according to the fourth embodiment in a state of being extended to the maximum length.

19 is a cross-sectional view taken along the line SC-SC in FIG.

20 is a cross-sectional view taken along the line SD-SD in FIG.

FIG. 21 is a cross-sectional view of a ventilation device according to one embodiment.

FIG. 22 is a cross-sectional view of a ventilation device according to another embodiment.

[Explanation of symbols]

 1 Outer Slider 2 Inner Slider 3 Engaging Claw 4 Engaging Energizing Means 5 Extension Direction Energizing Means 6a-6d Engaging Recesses 7 Engaging Disable Guide 8 Pressing Receiving Surface 10 Engagement Release Guide 13 Lock receiving projection (lock receiving portion) 14 Claw portion 15 Push contact portion 16 Lock portion 17 Rotating shaft 18 Lock release surface (lock release means) 21 Lock claw 22 Lock portion 23 Lock receiver ( Lock receiving part) 31 Outer slider 32 Inner slider 33 Locking claw 34 Engaging biasing means 35a to 35c Locking recess 36 Locking disengagement guide part 37 Locking disengagement releasing guide part 43 Locking receiver Stop receiving part) 44 Engagement release surface 45 Claw part 47 Locking protrusion (locking part) 51 Outer slider 52 Inner slider 53 Locking claw 54 Locking biasing means 55 Extension direction biasing means 56a to 56c Locking recess 57 Unengageable release guide part 58 Guide groove 58a No. Guide path 58b Second guide path 61 Engagement release surface (engagement release means) 62 Claw portion 64 Guide receiving shaft (guide portion) 71 Ventilation path member 72 Opening adjustment member 73 Actuating means 81 Ventilation path member 82 Opening adjustment member 83 Actuating means

Claims (4)

[Claims] 1. An outer slider having a plurality of locking recesses arranged at a predetermined interval in the length direction and provided with a plurality of locking recesses, an inner slider slidably assembled in the outer slider, and an inner slider assembled to the inner slider, A locking claw that engages with any one of a plurality of locking recesses of the outer slider when the inner slider and the outer slider slide relative to each other in the direction of contraction, and that locks the inner slider and the outer slider. Engagement urging means for urging the engaging claw in the engaging direction, and when sliding in the contracting direction, the engaging claw engaged in a certain engaging recess is inserted into another engaging recess from this engaged state. For this reason, the engagement releasing means for releasing the engagement state, the engagement impossible state imparting means for imparting a state in which the engagement claw cannot be engaged with the engagement recess, and the engagement impossible state imparted by the engagement impossible state imparting means. Inaccessible State maintaining means, unengageable state releasing means for releasing the inoperable state maintained by the inoperable state maintaining means, and the inner slider and the outer slider in the extending direction opposite to the contracting slide. An extension direction urging means for giving an urging force for sliding is provided, and the inner slider or the outer slider is pushed against the urging force of the extension direction urging means to slide in the contraction direction. Is sequentially engaged in the plurality of locking recesses in the above-described arrangement direction, contracts in stages, and is further pressed in a state of being contracted to the shortest, so that the immovable state providing means makes the locking claws unable to engage. In addition to this, the non-engageable state maintaining means maintains this state, during which the extension direction slides in the extension direction by the urging force of the extension direction urging means, and becomes the engagement impossible state in the longest state. Stepwise expansion mechanism by removing means engaging input impossible state of the locking claw becomes so as to be released. 2. The outer slider is provided with a pressing contact receiving surface on the side facing the locking recess arrangement side, and the locking claw has a claw portion on the tip end side and a pressing contact portion on the base end side. Then, it is rotatably assembled to the front end of the inner slider via a rotation shaft that supports the intermediate position between the claw and the pressing portion, and the claw is pushed in the engaging recess of the outer slider. The contacting portion is structured to provide a locked state between the inner slider and the outer slider by pressing the contacting surface of the outer slider, and the engagement releasing means is the engagement releasing surface provided on the claw portion of the retaining claw. Formed as
When the inner slider or the outer slider is pressed, the engagement release surface is pressed against the inner surface of the locking recess to rotate the locking claw in a direction away from the locking recess by a component force generated. The non-engageable state providing means is formed as a non-engageable guide portion provided on the outer slider at the position where the locking recesses are arranged in an extended position, and when the inner slider or the outer slider is further pressed in the state of being contracted to the shortest. The engaging claw is configured to rotate the engaging claw in a non-engaging direction to a predetermined state by a component force generated by pressing the engaging claw against the engaging disabling guide portion.
The non-engageable state maintaining means is formed by a combination of a locking receiving portion provided on the inner slider and a locking portion provided on the locking claw,
A structure in which the locking portion of the locking claw is locked to the locking receiving portion in a state in which the urging by the engaging urging means is restricted by the rotation of the engagement disabling guide portion to a predetermined state. The unengageable state releasing means is formed as an unengageable release guide portion provided on the outer slider at an arrangement extension position of the locking recesses on the opposite side of the engaging disabling guide portion, and has an extension direction. A structure in which the locking state is released by rotating in the locking direction when the locking claw is pressed against the unengageable unlocking guide portion when the locking member is in the longest state by the urging force of the biasing means. The gradual expansion and contraction mechanism according to claim 1. 3. The engaging claw is slidable in a direction intersecting with the sliding directions of both the inner and outer sliders and attached to the tip of the inner slider, and the forward claw causes the claw on the tip side of the outer slider to slide. It is structured such that it is engaged with the locking recess to provide a locked state of the inner slider and the outer slider, and the locking releasing means is formed as a locking releasing surface provided on the claw portion of the locking claw, and the inner slider or the outer side. When the slider is pressed, this engagement release surface presses against the inner surface of the locking recess to slide the locking claw in the direction away from the locking recess by the component force generated. The means is formed as an engagement disabling guide portion provided on the outer slider at the extended position of the arrangement of the locking recesses, and when the inner slider or the outer slider is further pushed in the state of being contracted to the shortest, the disabling means is provided. Guide section The locking claw is slid to a predetermined state in the non-engagement direction by a component force generated by the pressing of the locking claw to the lock receiving part provided on the inner slider. It is formed by a combination of the locking parts provided on the locking claws, and the locking parts are locked to the locking receiving parts by sliding the locking claws to the predetermined state by the locking disabling guide part. The pawl is in a non-engageable state, and the non-engageable state releasing means is formed as a non-engageable releasing guide portion provided on the side of the outer slider opposite to the side where the locking recess is provided. When the longest state is reached by the urging force of the biasing means, the locking claw is released from the lock receiving part by the component force generated by the lock claw pressing against the unlocking release guide part. 2. The structure according to claim 1, wherein the locking claw is slid in the engaging direction while Mounting of the step-by-step expansion and contraction mechanism. 4. The locking claw is slidable in a direction intersecting with the sliding directions of both the inner and outer sliders and attached to the tip of the inner slider, and the forward claw causes the claw on the tip side of the outer slider to slide. It is structured such that it is engaged with the locking recess to provide a locked state of the inner slider and the outer slider, and the locking releasing means is formed as a locking releasing surface provided on the claw portion of the locking claw, and the inner slider or the outer side. When the slider is pressed, this engagement release surface presses against the inner surface of the locking recess to slide the locking claw in the direction away from the locking recess by the component force generated. The means is formed as an engagement disabling guide portion provided on the outer slider at the extended position of the arrangement of the locking recesses, and when the inner slider or the outer slider is further pushed in the state of being contracted to the shortest, the disabling means is provided. Guide section The locking claw is slid to a predetermined state in the non-engagement direction by a component force generated by the pressing of the locking claw on the first engagement guide. With a structure in which the path and the second guide path are connected in a loop, it is formed by combining the guide groove provided on the outer slider and the guide receiving portion provided on the locking claw, and the locking claw can be engaged with the locking recess. The guide receiving portion is guided by the first guide path, and the guide receiving portion receives the guide in the second guide path when the locking claw is slid to a predetermined state by the engagement disabling guide portion. As a result, while the locking claw is kept in the non-engageable state, the guide receiving portion is again moved to the first position by the urging force of the engaging urging means after the two sliders slide relative to each other from this state to the longest state. State of receiving guide on the guideway Gradual stretching mechanism according to claim 1, which is structured to locking pawl and engaged entrant state to become.