JP3751669B2 - Stepwise expansion and contraction mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a telescopic mechanism that can be used, for example, as a mechanism for opening and closing a ventilation path of a ventilator or a mechanism for adjusting the height of a headrest provided in a seat of an automobile.
[0002]
[Prior art]
For example, Japanese Utility Model No. 6-12470 is known as an expansion / contraction mechanism using an in / out operation used to operate the air passage opening / closing member of the ventilator, and Japanese Utility Model No. 63-9762 can also be used as an expansion / contraction mechanism. A sliding mechanism is known. The telescopic mechanism in Japanese Utility Model Publication No. 6-12470 can be moved in and out by one-touch operation only by pushing, and is excellent in operability. However, in this mechanism, it is difficult to form a multistage expansion / contraction structure, that is, a structure in which the length is changed stepwise, and the functionality is limited. On the other hand, the sliding mechanism disclosed in Japanese Utility Model Publication No. 63-9762 can be expanded and contracted in multiple stages, but it is necessary to apply an external operation in both the extending direction and the contracting direction. For example, disclosed in Japanese Utility Model Publication No. 6-12470. However, it is difficult to use for a device such as a ventilator or a headrest of an automobile that is easy to push but difficult to pull.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an expansion / contraction mechanism that can be operated by a one-touch operation only by pushing multi-stage expansion / contraction.
[0004]
[Means for Solving the Problems]
The stepwise expansion and contraction mechanism according to the present invention is provided with a plurality of locking recesses arranged in the length direction at predetermined intervals, and provided with a guide portion for disabling engagement in the same row as the locking recesses. An inner slider, an outer slider that is slidably combined with the outer periphery of the inner slider, a claw portion that can be engaged with the locking recess on the distal end side, a pressing portion on the proximal end side, and a locking portion A plurality of engagements of the inner slider while being rotated when sliding relative to the inner slider and the outer slider in the contraction direction. A latch that engages the claw portion with any one of the retaining recesses, and in this engaged state, the pressing contact portion presses against the inner surface of the locking claw incorporating portion to provide a locking state between the inner slider and the outer slider. Nail, this locking claw Engaging urging means for urging in the entry direction, a latch receiving portion provided in the latch claw assembling portion, and an urging force for sliding the inner slider and the outer slider in the extension direction opposite to the slide in the contraction direction And a pressing member provided at a tip of the extending direction urging means.
[0005]
The contraction operation of the stepwise expansion / contraction mechanism is performed by pushing the inner slider or the outer slider against the urging force of the extension direction urging means to cause a slide in the contraction direction relative to both sliders. As the claw rotates, the claw portions are sequentially engaged in the plurality of locking recesses in the direction of arrangement, so that the claw shrinks in stages. By further pressing in the contracted state to the shortest, the locking claw is pressed against the guide portion for disabling the inner slider and rotates to a predetermined state in the non-engagement direction. While the claw locking portion is locked to the locking receiving portion in a state in which the urging force by the engaging urging means is restricted, the engagement cannot be maintained and the longest state is maintained by the urging force of the extending direction urging means. Slide in the direction of extension. When the longest state is reached, the pressing member at the tip of the extending direction biasing means is pressed to rotate the locking claw in the engaging direction to release the incapable state, and the above-mentioned stepwise contraction is performed again. become able to.
[0006]
As described above, the stepwise expansion / contraction mechanism according to the present invention can perform an expansion / contraction operation by a one-touch type operation in which only one of the sliders is pressed, and a device that is difficult to pull even if the pressing operation is easy to perform. Excellent suitability as a mechanism element.
[0007]
Embodiment
According to the first embodiment of the present invention, as shown in FIGS. 1 to 4, the stepwise expansion / contraction mechanism includes an outer slider 1, an inner slider 2, a locking claw 3, an engagement biasing means 4, and an extension direction attachment. The force means 5 is the main element.
[0008]
The outer slider 1 is formed in a rectangular tube shape with one end sealed as shown in the figure, or is formed in a cylindrical shape. And the latching claw built-in part 7 for accommodating the latching claw 3 in the assembly | attachment state as mentioned later is recessedly provided in the inner surface. Moreover, the latch receiving protrusion 8 is provided in the inner surface of the latching claw built-in part 7 as a latch receiving part of a non-engagement state maintenance means on both right and left sides (FIG. 4). The latch receiving protrusion 8 is supported by a leaf spring-like spring portion 8s as shown in the figure, and has a structure that can move in and out elastically in a direction intersecting with the rotation direction of the latching claw 3 described later. Or a fixed structure.
[0009]
The inner slider 2 is formed by giving an outer shape that can slide in the inner space of the outer slider 1. The inner slider 2 is provided with a concave recess forming groove 9 on one side, and a wedge-shaped concave recess 10 (10a to 10c) is intended at the bottom of the concave recess forming groove 9. As many as the number of expansion / contraction steps is arranged in the length direction with a predetermined interval, and the extension of this arrangement, more specifically, the locking recess 10c at the end of the locking recess forming groove 9 is provided. The guide part 11 for disabling engagement is provided at a position that is continuous with the edge of the guide member 11 as an inclined surface that is inclined upward in the extending direction.
[0010]
The locking claw 3 is provided with a claw portion 12 on the distal end side and a pressing contact portion 13 on the proximal end side, and forms a non-engageable state maintaining means in cooperation with the locking receiving projection 8 therebetween. The latching portion 14 has a structure projecting on both the left and right sides (FIG. 4), and is rotated to the latching claw incorporating portion 7 of the outer slider 1 through the rotation shaft 15 at an intermediate position between the pawl portion 12 and the pressing portion 13. Embed movably. As described above, when the latch receiving projection 8 has a fixed structure, the latch portion 14 is elastically deformable.
[0011]
The engagement biasing means 4 is formed by a pair of torsion coil springs 4s and 4s (FIG. 4) as in the example of the figure, or as another example by a tension coil spring and the like, The claw portion 12 is assembled so as to give a rotational biasing force in a direction in which the claw portion 12 is engaged with the locking recess 10.
[0012]
The extension direction biasing means 5 has a structure in which the other end of the compression coil spring 17 having a pressing member 16 connected to one end thereof is supported by the closing end of the outer slider 1, and the inner slider 2 is expanded and contracted with respect to the outer slider 1 as will be described later. It forms so that the urging | biasing force slid to the extension direction in operation | movement may be given.
[0013]
The expansion / contraction operation of the stepwise expansion / contraction mechanism according to this embodiment is performed as follows. First, as an overall operation, the outer slider 1 and the inner slider 2 move forward (arrow X in FIG. 2 for the outer slider 1 and arrow Y in FIG. 2 for the inner slider 2) or backward slide (for the outer slider 1). The arrow V in FIG. 2 and the inner slider 2 are relatively expanded by making the arrow W) in FIG. 2 relatively, and contract with the forward slide and extend with the backward slide.
[0014]
Next, as a specific operation, the state of FIG. 2 and FIG. 5 (a) is the state extended to the longest. In this state, the energizing force by the engaging energizing means 4 in the engaging direction will be described later. The state in which the engaging claw 3 is released by rotating the engaging claw 3 in the engaging direction by the pressing contact of the pressing body 16 is released. Is pressed against the end of the inner slider 2 and the pressing portion 13 is pressed against the inner surface of the locking claw incorporating portion 7 in the same manner as in the locking recess 10 described later. Yes.
[0015]
When the outer slider 1 or the inner slider 2 is pushed in the forward sliding direction from this state, the tip of the claw portion 12 of the locking claw 3 is pressed against the bottom of the locking recess forming groove 9 of the outer slider 1 (FIG. 2). In a state similar to that indicated by a two-dot chain line), both sliders move relatively forward (FIG. 5 (b)) and engage when the claw portion 12 of the locking claw 3 reaches the first locking recess 10a. It is rotated / engaged by the urging force of the urging means 4. When the claw portion 12 of the locking claw 3 is engaged with any of the locking recesses 10 (10a to 10c), the pressing portion 13 of the locking claw 3 is stretched against the inner surface of the locking claw incorporating portion 7. Press contact. Then, by this pressing and the locking of the claw portion 12 to the locking recess 10, the extension direction slide is restricted against the urging force of the extension direction urging means 5 to maintain a constant length ((FIG. 5 ( c)).
[0016]
If the outer slider 1 or the inner slider 2 is pushed in the forward slide direction in this state, the latching claw 3 is not moved by the component force of the pressing force generated by the outer surface of the claw portion 12 pressing against the inner surface of the locking recess 10a. Rotating in the engaging direction, the claw portion 12 is disengaged from the locking recess 10a as shown by a two-dot chain line in FIG. 2, and the locking claw 3 engages the claw portion 12 with the adjacent locking recess 10b. The length corresponding to this is obtained.
[0017]
Thus, the outer slider 1 or the inner side is contracted in a stepwise manner, with the claw portion 12 of the locking claw 3 being engaged with the locking recess 10c at the end of the forward slide side, that is, in the contracted state to the shortest. When the slider 2 is pushed in the forward slide direction, the claw portion 12 presses against the engaging disabling guide portion 11 that is continuous with the end edge of the locking recess 10 (FIG. 3 and FIG. 5B). The locking claw 3 is rotated in the non-engagement direction by the component force of the pressing force generated by. This rotation is performed to an angle at which the locking portion 14 of the locking claw 3 rides over the locking receiving projection 8 while slidably moving on the locking receiving projection 8. In this state, it is engaged with the engagement receiving protrusion 8 (indicated by a one-dot chain line in FIG. 3). In this state, the pressing portion 13 of the locking claw 3 also floats from the inner surface of the locking claw incorporating portion 7. Therefore, there is no element that regulates the urging force of the extension direction urging means 5, and both the sliders 1 and 2 slide backward by the urging force of the extension direction urging means 5 and extend to the longest state shown in FIG. Return to the final state.
[0018]
When extended to the longest state, the pressing body 16 is pressed against the locking claw 3 while receiving the urging force of the compression coil spring 17, and thereby the locking claw 3 rotates in the engagement direction. This rotation is made so that the locking portion 14 of the locking claw 3 gets over the locking receiving projection 8 in the direction opposite to that described above, and the locking claw 3 moves in the engagement direction. It can be turned.
[0019]
The stepwise expansion and contraction mechanism according to the second embodiment of the present invention is as shown in FIGS. In this embodiment, the locking claw 21 is provided with a locking portion 22 having a step structure as seen in FIG. The latch receiving body 23 is provided on the latch claw incorporating portion 7 of the outer slider 1 for the receiving portion. The latch receiving body 23 is formed in a clip shape using a springy plate material, and has a structure in which a constricted portion 23c is provided between a trapezoidal portion 23a on the proximal end side and an expanded portion 23b on the distal end side. Then, when the locking claw 21 is rotated to the state indicated by the two-dot chain line by pressing against the locking disabling guide portion 11, the locking portion 22 expands the constricted portion 23 c of the locking receiving body 23. In this way, it is possible to maintain the state of being unable to engage. Note that the locking portion 22 and the locking receiver 23 can be combined in reverse. 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 receiving portion similar to the locking portion 22 is formed in the locking claw incorporating portion. Since other structures and expansion / contraction operations in the present embodiment are the same as those in the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.
[0020]
An embodiment using the stepwise expansion and contraction mechanism according to the above embodiment will be described. One embodiment is a form used for a ventilator. As shown in FIG. 8, the ventilating apparatus according to this embodiment mainly includes an air passage member 31, an opening degree adjusting member 32, and an operating means 33 formed by the stepwise expansion and contraction mechanism according to the above embodiment.
[0021]
The air passage member 31 is formed in a short cylindrical shape having an inside as an air passage, and a frame 34 having a decorative bend is provided at the tip. On the other hand, the opening degree adjusting member 32 has a structure including a cylindrical portion 36 in which a plurality of ventilation openings 35 are formed on a side surface, a decorative face portion 33, and a connection portion 38 protruding from the center of the face portion 33. The opening adjusting member 32 is slidably fitted to the air passage member 31, and both members are connected by the operating means 33.
[0022]
In this ventilator, when the opening adjustment member 32 is pushed as indicated by an arrow X, the actuating means 33 performs stepwise expansion and contraction as described above, and the ventilation opening 35 of the opening adjustment member 32 is accordingly connected to the ventilation path member. 31 is closed or the closed state is released, and the opening degree of the air passage in the air passage member 31 is adjusted accordingly.
[0023]
Next, an embodiment used for an automobile headrest will be described. In this case, as shown in FIG. 9, two sets of actuating means 41 using the stepwise expansion / contraction mechanism according to the above-described embodiment are incorporated into the seat back 40 and the headrest 42 is held by the pair.
[0024]
【The invention's effect】
As described above, the stepwise expansion and contraction mechanism according to the present invention can be performed by a one-touch type operation that only pushes multistage expansion and contraction. Contributes to improved functionality.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a stepwise expansion / contraction mechanism according to a first embodiment.
2 is a cross-sectional view taken along line SA-SA in FIG.
FIG. 3 is a partial enlarged cross-sectional view corresponding to FIG. 2;
4 is a structural diagram of a locking claw built-in portion viewed from the direction of arrow DA in FIG.
FIG. 5 is an operation explanatory diagram of the stepwise expansion and contraction mechanism according to the first embodiment.
FIG. 6 is a cross-sectional view of a main part corresponding to FIG. 2 of a stepwise expansion / contraction mechanism according to a second embodiment.
FIG. 7 is an explanatory view of a state in which a locking claw is locked to a locking receiving portion.
FIG. 8 is a cross-sectional view of a ventilation device using a stepwise expansion and contraction mechanism according to the present invention.
FIG. 9 is a perspective view of a headrest using a stepwise expansion / contraction mechanism according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer slider 2 Inner slider 3 Locking claw 4 Engaging biasing means 5 Elongation direction biasing means 8 Locking receiving protrusion (locking receiving part)
10a to 10d Locking recess 11 Locking guide part 12 Claw part 13 Pushing part 14 Locking part 15 Rotating shaft 21 Locking claw 22 Locking part 23 Locking receiving body (locking receiving part)

Claims (1)

An inner slider provided with a plurality of locking recesses arranged in the length direction with a predetermined interval and provided with a guide portion for disengagement in the same row as the locking recesses, on the outer periphery of the inner slider An outer slider that is slidably assembled, a claw portion that can be engaged with the locking recess on the distal end side, a pressing portion on the proximal end side, and a locking portion, and an outer slider via a rotating shaft The claw portion is rotatably assembled to the engaging claw built-in portion formed on the inner slider, and is rotated when the inner slider and the outer slider slide relative to each other in the contracting direction. The locking claw that gives the locking state of the inner slider and the outer slider when the pressing portion presses the inner surface of the locking claw built-in portion in this engaged state, and the locking claw is engaged. Engagement biasing means biasing in the direction A latch receiving portion provided in the latch claw incorporating portion, an extension direction biasing means for applying a biasing force for sliding the inner slider and the outer slider in the extension direction opposite to the slide in the contraction direction, and the extension direction A pressing body provided at the tip of the urging means is provided, and the inner slider or the outer slider is pressed against the urging force of the extension direction urging means to slide in the contraction direction. The claw portions are sequentially engaged with the plurality of locking recesses in the arrangement direction while rotating, and then gradually contracted, and further pressed in the contracted state to the shortest, so that the locking claw engages with the inner slider. In a state where it is rotated to a predetermined state in the non-engagement direction by being pressed against the non-entry guide portion, and the engagement portion of the engagement claw regulates the urging by the engagement urging means by this rotation. By locking to the locking receiver While maintaining the non-insertable state, the sliding force in the extending direction is made to the longest state by the urging force of the extending direction urging means, and when the longest state is reached, the pressing body at the end of the extending direction urging means is pressed and locked. A stepwise expansion and contraction mechanism that releases a state where it cannot be engaged by rotating the claw in the engagement direction.

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