WO2012029461A1

WO2012029461A1 - Non-stepless moving-up device and non-stepless lifter device

Info

Publication number: WO2012029461A1
Application number: PCT/JP2011/067202
Authority: WO
Inventors: 藤岡　秀彦; 紀之材木; 鈴木　宏行; 浩司古賀
Original assignee: シロキ工業株式会社
Priority date: 2010-08-30
Filing date: 2011-07-28
Publication date: 2012-03-08
Also published as: JP5563408B2; JP2012046139A

Abstract

A non-stepless moving-up device and a non-stepless lifter device of a simple structure, excellent operability and low cost which are capable of non-stepless vertical movement of a vertically moving body. The non-stepless moving-up device comprises: a vertically moving link which has a pivoting section to a base section and another pivoting section to the vertically moving body; a toothed link which is pivoted to either the base section or the vertically moving body, comprises a link ratchet and a link pinion located on an arc centering on the pertinent pivot axis, and swings in such a way as to be interlocked with the vertically moving link; an input member which is supported by a member in such a way as to be capable of swinging between a neutral position and a moved-up position and comprises an input pinion to mesh with the link pinion, said member being the vertically moving body or the base section, as applicable, which has the pivot axis for the toothed link; and a moving-up prevention latch mechanism which, at a neutral position for the input member, meshes with the link ratchet, thereby preventing the toothed link from upward swing, and which, when the input member is subjected to a swing operation in the moving-up direction, allows the upward swing of the toothed link.

Description

Stepped lift device and stepped lifter device

The present invention relates to a stepped lifting device that can lift a lifting body (for example, a seat seat surface) in a stepped manner by a reciprocating swinging motion of an input member, and further lower the lifting member in a stepped direction in a descending direction. The present invention relates to a stepped lifter device that can perform.

For example, devices for raising and lowering the seat surface of a vehicle are roughly classified into a stepless lifter device that raises and lowers the seat surface steplessly and a stepped lifter device that raises and lowers the seat surface stepwise.

JP 7-195969 A JP 2000-190762 A US Pat. No. 5,466,047

Of these, the stepless lifter device has the advantage of being excellent in operability without being affected by weight, but the mechanism is complicated and the cost is high. On the other hand, the stepped lifter device has a relatively simple structure, but has a problem in operability (usability) and is practically not practically used.

An object of the present invention is to obtain an inexpensive lifter device (stepped lifting device) having a simple structure and excellent operability, which can be raised and lowered (particularly raised) in particular with a step. That is, an object of the present invention is to obtain a lifter device that does not have a complicated structure like a stepless lifter device and is constituted by a combination of metal plate materials, so that the cost is low and the device operates reliably.

In the aspect of the stepped lifting device, the present invention relates to a lifting link having a pivotally attached portion to the base and a pivotally attached portion to the elevator; the pivot is pivotally attached to one of the base and the elevator. A toothed link having a link ratchet and a link pinion located on an arc centered on an axis, and swinging in conjunction with the lifting link; of the lifting body and the base, the pivoting shaft of the toothed link An input member having an input pinion that meshes with the link pinion supported by the member on the side to be swingable between a neutral position and a raised position; and in the neutral position of the input member, meshes with the link ratchet And a lift preventing latch mechanism that prevents the toothed link from swinging upward and allows the toothed link to swing upward when the input member is swung in the upward direction.

The elevating link and the toothed link can be separate members or the same member.

Specifically, the lift prevention latch mechanism has a meshing claw portion that meshes with the link ratchet, the lift prevention latch pivotally attached to a member on which the toothed link is pivotally attached, and the lift prevention latch. It is preferable to have an ascending interlocking portion that moves to a meshing position with the link ratchet and a non-meshing position in conjunction with the swinging operation of the input member.

In the stepped lifting device according to the present invention, an upward movement transmission ratchet supported so as to be capable of relative rotation with the input member coaxially with the swing shaft of the input member; and meshing with the upward movement transmission ratchet; A motion transmission latch supported by the input member for rotating the upward direction motion transmission ratchet together when the input member is operated to swing upward from a neutral position; and rotating in conjunction with the upward direction motion transmission ratchet. It is preferable to provide a rising direction stepped rotation transmission mechanism having an input pinion that meshes with a link pinion of the toothed link that moves.

In one aspect of the stepped lifting device of the present invention, the input member is operated to swing from the neutral position in the upward direction, and the motion transmission latch of the upward direction stepped rotation transmission mechanism is adjacent to the upward direction motion transmission ratchet. While moving in the idle running section between the teeth, the meshing claw portion of the lift prevention latch of the lift prevention latch mechanism is positioned at the non-engagement position with the link ratchet.

In the aspect of the stepped lifter apparatus according to the present invention, the input member can be further swung in the downward direction from the neutral position. At the neutral position of the input member, the toothed link meshes with the link ratchet to prevent the toothed link from swinging downward, and the toothed link is allowed to swing downward when the input member is swung downward. The first lowering prevention latch mechanism; and the lowering / lowering of the lifting link allowed to swing downward by the first lowering prevention latching mechanism is allowed for one tooth of the link ratchet, and the lowering / lowering of the lifting link is further increased. A second anti-falling latch mechanism that meshes with the link ratchet to prevent it.

Specifically, the second lowering prevention latch mechanism includes a second lowering prevention latch rotatably supported by the input member; and biasing the second lowering prevention latch in a meshing direction with the link ratchet. An urging spring; and a lowering interlocking portion provided between the input member for restricting independent rotation of the second lowering prevention latch with respect to the input member by the urging spring and the second lowering prevention latch. .

In the stepped lifter device according to the present invention, when the input member is swung upward from the neutral position, the first lowering prevention latch mechanism allows the toothed link to rotate, and the input member is moved downward from the neutral position. When it is swung to the right, the anti-raising latch mechanism allows the toothed link to rotate.

A link ratchet that meshes with the first lowering prevention latch mechanism, and one and the other of the link ratchet that meshes with the ascent prevention latch mechanism, and a convex link ratchet formed with the same tooth profile on the step formed on the toothed link, in order to reduce the size. A concave link ratchet is preferred.

Similarly, the diameter of the link pinion of the toothed link and the center axis of the link ratchet should be different.

In the stepped lifter device of the present invention, when the input member swings from the neutral position to the raised position and then returns to the neutral position, the first lowering prevention latch mechanism prevents the toothed link from swinging downward. Above, the anti-raising latch mechanism meshes with the link ratchet.

The stepped lifter device of the present invention preferably includes neutral position return means for returning the input member to the neutral position when the operating force applied to the input member is released.

The number of parts can be reduced by making the lifting link and the toothed link the same member.

¡On the other hand, the elevating link and the toothed link are made as separate members, and the degree of freedom of arrangement can be increased by interlocking with the connecting link.

Furthermore, in another aspect, the lift link and the toothed link are made as separate members, and the position of the lift link can be integrally coupled to the shaft on the base side or the shaft on the lift body side in a different axial direction. It is.

According to the present invention, it is possible to obtain a stepped lifting device that can lift the lifting body in a stepped manner by a reciprocating swing between the neutral position and the raised position of the input member with a simple structure at low cost. If the input member can be reciprocally swung from the neutral position to the lowered position, a stepped lowering device (stepped lifter device) can be obtained at the same time. According to the present invention, it is possible to obtain a device that does not have a complicated structure like a stepless lifter device and that operates inexpensively and is configured by a combination of metal plate materials.

It is a disassembled perspective view which shows one Embodiment of the stepped lifter apparatus which has a stepped raising apparatus by this invention. It is sectional drawing which follows the II-II line | wire of FIG. 4 in the assembly state of the stepped lifter apparatus. It is sectional drawing which follows the III-III line | wire of FIG. 4 in the same assembly state. It is a side view which shows the locked state of the specific height position of the stepped lifter apparatus. It is a side view which shows the 1st step of the raising operation of the stepped lifter device. It is a side view which shows the 2nd step of the same raising operation. It is a side view which shows the 3rd stage (end stage) of the same raising operation. It is a side view which shows the 1st step of the downward operation from the state of FIG. 4 of the stepped lifter apparatus. It is a side view showing the 2nd step of the descent operation. It is a side view showing the 3rd stage (end stage) of the descent operation. It is a side view which shows other embodiment of the stepped lifter apparatus by this invention. FIG. 3 is a detailed view showing all the elements drawn by solid lines, showing details of the movable part of the stepped lifter device according to the present invention.

The illustrated embodiment shows an embodiment in which the present invention is applied to a vehicle seat height adjusting device. The exploded perspective view of FIG. 1 shows all the components of the seat height adjusting device, but the front-rear (front and back) relationship of the members is not accurate. 2 and 3 are cross-sectional views in an assembled state at different cross-sectional positions, and the vertical (front and back) relationship of the members is accurately depicted. First, the overall configuration will be described mainly with reference to FIGS.

The elevating link 10 has

pivot attachment holes

11 and 12 on the upper and lower sides, and the upper pivot attachment hole 11 is pivotally attached to a seat bracket (elevating body) 13 on which a seat (seat surface) is supported by a pivot attachment shaft 11S. A lower pivot attachment hole 12 is pivotally attached to a floor bracket (base) 14 integral with the floor surface by a pivot attachment shaft 12S. Therefore, when the lifting link 10 swings forward and backward around the pivot hole 11 or the pivot hole 12, the seat bracket 13 is lifted and lowered. In this embodiment, the elevating link 10 includes a link pinion 15 located on an arc centered on the pivot attachment hole 11 on the seat bracket 13 side, and a link ratchet 16 (convex link ratchet 16X having a smaller diameter than the link pinion 15). A concave link ratchet 16Y) is integrally formed. In this embodiment, the lift link 10 is a toothed link having a link pinion 15 and a link ratchet 16 at the same time.

First and second

auxiliary brackets

17 and 18 fixed on the front and back of the seat bracket 13 are mounted on the seat bracket 13 (member having the pivot shaft 11S which is the arc center of the link pinion 15 and the link ratchet 16). The shaft 21 is rotatably supported, and a control lever (input member) 20 is supported on the shaft 21 via a sleeve 21S so as to be relatively rotatable. The shaft 21 is formed with

serrations

21a and 21b at both ends thereof. The

serrations

21a and 21b are connected to an input pinion 22 that meshes with the link pinion 15 of the lift link 10 and a shaft 27a on the control lever 20. An upward motion transmission ratchet 23 that engages a pivoted motion transmission latch 27 is coaxially coupled together. In other words, the shaft 21 integrally connecting the input pinion 22 and the upward movement transmission ratchet 23 and the control lever 20 are relatively rotatable. In the control lever 20, a pair of legs 20a1 of a neutral position return spring 20a provided around the shaft 21 is engaged with the neutral projection 20d, and the lever 20 is always held in a neutral position. That is, the control lever 20 is held at the neutral position when no operating force is applied, and can be swung up and down. When the operating force is released, the control lever 20 returns to the neutral position by the force of the neutral position return spring 20a. .

The elevating link 10 is formed with an arc guide 10P centered on the pivot hole 11, and the arc guide 10P has guide pins 10Q fixed at both ends to the seat bracket 13 and the first auxiliary bracket 17. Fits relative to each other.

Between the seat bracket 13 and the first auxiliary bracket 17, a first lowering prevention latch 24 that engages with the convex link ratchet 16X and a rise prevention that engages with the concave concave link ratchet 16Y corresponding to the convex link ratchet 16X. A latch 26 is pivotally mounted on the same shaft 46. That is, the convex link ratchet 16X of the elevating link 10 is formed with a step in the axial direction with respect to the link pinion 15 as shown in FIGS. 2 and 3, and inward in the radial direction of the link pinion 15. Is formed with a concave link ratchet 16Y having the same tooth profile (same pitch circle, pitch, module) as the convex link ratchet 16X, and the convex claw ratchet 16X has a meshing claw portion (tip claw portion, (Engagement claw portion) 24c is engaged, and the engagement claw portion (tip claw portion, engagement claw portion) 26a of the ascent prevention latch 26 is engaged with the concave link ratchet 16Y. In FIG. 1, only the convex link ratchet 16X appears. In FIGS. 4 to 10, the convex link ratchet 16X and the concave link ratchet 16Y are shown by a single line for convenience of illustration.

The first lowering prevention latch 24 and the rising prevention latch 26 are connected to the teeth of the convex link ratchet 16X by a latch urging spring (torsion spring) 46a stretched between them. The engagement claw portion 26a of the ascent prevention latch 26 is biased in a direction to engage with the teeth of the concave link ratchet 16Y. That is, in the free state, both the first lowering prevention latch 24 and the raising prevention latch 26 are engaged with the link ratchet 16.

The first lowering prevention latch 24 and the convex link ratchet 16X are latched when the elevating link 10 swings in the ascending direction (the clockwise direction in FIG. 1 and the counterclockwise direction in FIGS. 4 to 10) about the pivotal attachment hole 11. When the meshing claw portion 24c climbs over the teeth of the convex link ratchet 16X (link ratchet 16) against the force of the biasing spring 46a and allows its swinging, and conversely swings in the downward direction (clockwise direction) The meshing claw portion 24c constitutes a one-way rotation allowing stepped stopper mechanism that engages with the teeth of the convex link ratchet 16X (link ratchet 16) and prevents its swinging.

On the contrary, the ascending prevention latch 26 and the concave link ratchet 16Y (link ratchet 16) are arranged so that the elevating link 10 descends around the pivot hole 11 (counterclockwise in FIG. 1, clockwise in FIGS. 4 to 10). When swinging, when the meshing claw portion 26a climbs over the teeth of the concave link ratchet 16Y (link ratchet 16) against the force of the latch biasing spring 46a, the swinging is allowed. The engagement claw portion 26a is engaged with the teeth of the concave link ratchet 16Y (link ratchet 16) to constitute a one-way rotation allowing stepped stopper mechanism. In other words, the convex link ratchet 16X (and the engaging claw portion 24c of the first lowering prevention latch 24) and the concave link ratchet 16Y (and the engaging claw portion 26a of the rising prevention latch 26) are allowed to rotate in one direction. It has a tooth shape that can constitute a step stopper mechanism and is formed at an equal pitch.

The first lowering prevention latch 24 is provided with a forced release pin 24d on its side surface. When the lever 20 is swung downward from the neutral position, the control lever 20 is engaged with the forcible release pin 24d of the first lowering prevention latch 24, and the first lowering prevention latch 24, the link ratchet 16, A forced release protrusion 20b is formed to release the engagement. The link ratchet 16, the first lowering prevention latch 24, the forcible release pin 24d, and the forcible release protrusion 20b of the control lever 20 prevent the lifting link 10 from swinging downward in the neutral position of the control lever 20, and the lever 20 is moved downward. A first lowering prevention latch mechanism that allows the lifting / lowering link 10 to swing downward when the swinging operation is performed is configured.

A second lowering prevention latch 25 and an interlocking lever 29 are pivotally attached to the shaft 21 on the seat bracket 13 (auxiliary brackets 17, 18) so as to be capable of mutual relative rotation and relative rotation with the control lever 20. Yes. The second lowering prevention latch 25 and the interlocking lever 29 are connected to each other by a latch biasing spring (torsion spring) 59 stretched between them. ) 25b meshes with the convex link ratchet 16X (link ratchet 16), and the engagement protrusion 29a of the interlocking lever 29 is urged to rotate in a direction to contact the pressed surface 26b of the ascent prevention latch 26. The engaging protrusion 29 a of the interlocking lever 29, the pressed surface 26 b of the ascent prevention latch 26, and the regulation pin 20 c constitute an ascending interlocking part of the control lever 20 and the ascent prevention latch 26.

The restriction pin 20 c planted on the control lever 20 abuts on the position restriction surface 25 c of the second lowering prevention latch 25 that is pivotally biased by the latch biasing spring 59, and further, the bifurcated interlocking portion of the interlocking lever 29. The second lowering prevention latch 25 and the interlocking lever 29 follow (interlock) with the movement of the control lever 20. When the control lever 20 is in the neutral position, the second lowering prevention latch 25 is held at the non-engagement position where the meshing claw portion 25b disengages the convex link ratchet 16X (FIG. 4). When the second lowering prevention latch 25 is rotated by the force of the latch urging spring 59 when it is rotated downward from the neutral position, the engagement claw portion 25b and the convex link ratchet 16X are brought into contact with or engaged with each other. When the second lowering prevention latch 25 is in contact with the link ratchet 16 and its rotation is prevented, and the control lever 20 is further swung in the lowering direction, the control lever 20 is engaged with the second lowering prevention latch 25. The latch biasing spring 59 is accumulated during the relative rotation.

On the other hand, the bifurcated interlocking portion 29b of the interlocking lever 29 is always engaged (interlocked) with the regulation pin 20c of the control lever 20, and the engaging protrusion 29a of the interlocking lever 29 prevents the rise at the neutral position of the control lever 20. A force is not substantially exerted on the pressed surface 26b of the latch 26. For this reason, the meshing claw 26a of the ascent prevention latch 26 is maintained in meshing with the concave link ratchet 16Y by the force of the latch biasing spring 46a (FIG. 4). On the other hand, when the control lever 20 is swung in the upward direction, the engaging protrusion 29a of the interlocking lever 29 that rotates in conjunction with the control lever 20 presses the pressed surface 26b of the upward preventing latch 26, and the meshing claw portion 26a. And the concave link ratchet 16Y are disengaged (FIGS. 5 and 6). When the control lever 20 is swung in the downward direction, the engagement protrusion 29a of the interlocking lever 29 and the pressed surface 26b of the ascent prevention latch 26 are separated (FIGS. 8 and 9).

The control lever 20, the interlocking lever 29, the rise prevention latch 26 and the concave link ratchet 16Y are engaged with the engagement claw 26a of the rise prevention latch 26 and the concave link ratchet 16Y when the control lever 20 is in the neutral position. When the control lever 20 is swung in the upward direction from the neutral position by preventing the upward / downward movement of the lift link 10 (the upward movement of the seat bracket 13), the meshing claw 26a of the lift prevention latch 26 and the concave link ratchet 16Y And a lift prevention latch mechanism that allows the lift link 10 to swing upward (the movement of the seat bracket 13) is configured.

Further, the control lever 20, the second lowering prevention latch 25, and the link ratchet 16 are not changed until the control lever 20 is swung to the lower end after the first lowering prevention latch mechanism allows the lowering link 10 to swing downward. The second lifting prevention latch mechanism is configured to allow the lowering and swinging of the lifting link 10 for one tooth of the link ratchet 16 and then mesh with the link ratchet 16 to prevent the lifting and lowering link 10 from swinging downward. Further, the restriction pin 20c on the control lever 20 and the position restriction surface 25c of the second lowering prevention latch 25 make the second lowering prevention latch 25 and the lever 20 when the control lever 20 is swung downward from the neutral position. When the control lever 20 is further swung in the downward direction after the second lowering prevention latch 25 is engaged (contacted) with the link ratchet 16, the control lever while accumulating the latch urging spring 59 is stored. A descent interlocking unit that swings only 20 in the descent direction is configured.

The motion transmission latch 27 pivotally attached to the control lever 20 by a shaft 27a includes a meshing claw portion 27c that meshes with the upward motion transmission ratchet 23 at its free end. The movement transmission latch 27 is biased by a latch biasing spring 27b in a direction in which the meshing claw 27c meshes with the teeth of the upward movement transmission ratchet 23. The movement transmission latch 27 and the upward movement transmission ratchet 23 are such that when the control lever 20 swings in the upward direction (clockwise in FIG. 4 and below) about the shaft 21, the engaging claw portion 27c is interposed via the stopper surface 23b. When the ascending direction motion transmitting ratchet 23 (and the input pinion 22) are rotated together and conversely swung in the descending direction (counterclockwise in FIG. 4 and below), the meshing claw portion 27c of the ascending direction motion transmitting ratchet 23 An upward direction stepped rotation transmission mechanism that allows the rotation over the circular arc surface 23a is configured. The pitch of the teeth having the circular arc surface 23 a and the stopper surface 23 b of the ascending direction motion transmission ratchet 23 corresponds to the tooth pitch of the link ratchet 16. Further, an idle running arc surface (idle running section) 23c (FIG. 12 and the like) is formed between adjacent teeth (arc surface 23a and stopper surface 23b).

A forcible release pin 27d is planted on the motion transmission latch 27, and the forcible release pin 27d is inserted into a position restricting cam hole 28 formed in the second auxiliary bracket 18 fixed on the seat bracket 13. It is fitted. The position restricting cam hole 28 does not come into contact with the forcible release pin 27d, and interferes with the release portion 28a that does not restrict the rotation end by the latch urging spring 27b of the motion transmission latch 27, and the forcible release pin 27d, thereby latch urging. And an unlocking surface 28b for moving the motion transmission latch 27 to the unlocked position against the force of the spring 27b. The forced release pin 27d on the motion transmission latch 27 and the position restricting cam hole 28 of the second auxiliary bracket 18 bring the motion transmission latch 27 into the meshing position with the upward direction motion transmission ratchet 23 in the neutral position of the control lever 20. When the control lever 20 is swung in the downward direction from the neutral position, it constitutes a lowering allowance mechanism that disengages the motion transmission latch 27 and the upward direction motion transmission ratchet 23.

4 to 10 are diagrams for explaining the operation of the stepped lifter mechanism configured as described above. In FIG. 4 to FIG. 10, all elements are drawn with a solid line ignoring the vertical relationship of the members. Of the control lever 20, which is a movable lever member, the first lowering prevention latch 24, the second lowering prevention latch 25, the raising prevention latch 26, the motion transmission latch 27 and the interlocking lever 29, the ascent prevention latch 26 and the interlocking lever 29 are described. The first descent prevention latch 24 is drawn with a broken line, the second descent prevention latch 25 is drawn with a one-dot chain line, and the control lever 20 and the motion transmission latch 27 are hatched with different directions. The restriction pin 20c is a member on the control lever 20, and the motion transmission latch 27 is a member pivoted on the control lever 20 by a shaft 27a. FIG. 12 shows details in which the members around the shaft 21, the shaft 46, and the shaft 27 a are all drawn with solid lines without being inked or hatched.

First, the ascending operation will be described with reference to FIGS. FIG. 4 shows a state where the control lever 20 is in the neutral position. At this time, the engaging claw portion 26a of the ascent prevention latch 26 is engaged with the concave link ratchet 16Y, and the engaging claw portion 24c of the first lowering prevention latch 24 is engaged with the convex link ratchet 16X, so that the ascending / descending swing of the elevating link 10 is lowered. Is blocking. On the other hand, the meshing claw portion 25b of the second lowering prevention latch 25 is in a non-engagement position with the convex link ratchet 16X. The motion transmission latch 27 is along the arc surface 23 a of the upward direction motion transmission ratchet 23.

In this state, when the control lever 20 is swung in the upward direction around the shaft 21, the interlocking lever 29 is swung in the same direction due to the engagement relationship between the regulation pin 20c and the bifurcated interlocking portion 29b. The engaging protrusion 29a presses the pressed surface 26b of the ascent prevention latch 26, and the engagement between the engagement claw 26a and the concave link ratchet 16Y is released. During this time, the meshing claw portion 27c of the motion transmission latch 27 idles the idle running arc surface 23c of the upward direction motion transmission ratchet 23 and comes into contact with the next stopper surface 23b (FIG. 5). Since the forcible release pin 27d of the motion transmission latch 27 is located within the opening 28a of the position restricting cam hole 28, the movement of the motion transmission latch 27 is not hindered.

When the control lever 20 is further swung in the upward direction from the state of FIG. 5, the engagement claw portion 27 c of the motion transmission latch 27 presses the stopper surface 23 b, and as a result, the input pinion 22 rotates integrally through the shaft 21. The elevating link 10 having the link pinion 15 meshing with the input pinion 22 swings in the ascending direction by one tooth (FIG. 6). At this time, the control lever 20 swings the second lowering prevention latch 25 together, but the engagement between the engagement claw portion 25b and the convex link ratchet 16X is disengaged from the beginning, and does not affect the above-described ascending operation. That is, the second lowering prevention latch 25 has no function when the control lever 20 is raised. Further, the meshing claw portion 24c of the first lowering prevention latch 24 maintains meshing with the convex link ratchet 16X, but allows the relative swinging in the upward direction of the convex link ratchet 16X. Further, since the forced release protrusion 20b of the control lever 20 moves in a direction away from the forced release pin 24d of the first lowering prevention latch 24, no force acts on the first lowering prevention latch 24.

In the state shown in FIG. 6, when the control lever 20 is opened, the control lever 20 returns to the neutral position by the force of the neutral position return spring 20a. Then, the engaging claw portion 26a of the ascent prevention latch 26 meshes with the concave link ratchet 16Y again at a position shifted by one tooth, and the ascending / descending movement of the elevating link 10 is prevented. Further, the downward swing is prevented by the engagement between the engagement claw portion 24c of the first decrease prevention latch 24 and the convex link ratchet 16X (FIG. 7).

Therefore, each time the control lever 20 is swung once in the upward direction from the neutral position, the lift link 10 has the upward direction in which the upward direction motion transmission ratchet 23 and the link ratchet 16 (convex link ratchet 16X) rise by one tooth. A step rotation transmission operation is performed.

Next, the descent operation will be explained. In the state of FIG. 4, when the control lever 20 is swung downward about the shaft 21, the position of the forced release pin 27 d of the motion transmission latch 27 on the control lever 20 in the position restricting cam hole 28 changes. Start (Figure 8). When the forcible release pin 27d changes the engagement position from the opening 28a to the lock release surface 28b, the motion transmission latch 27 is disengaged from the upward direction motion transmission ratchet 23 against the force of the latch biasing spring 27b. (Figs. 8 and 9). Further, the forcible release projection 20b of the control lever 20 pushes the forcible release pin 24d to swing the first lowering prevention latch 24 about the shaft 46, and the meshing claw portion 24c is connected to the link ratchet 16 (convex link ratchet 16X). To the non-engagement position (FIG. 9).

On the other hand, when the control lever 20 swings in the downward direction, the meshing claw portion 25b of the second lowering prevention latch 25 eventually comes into contact with and engages with the teeth of the link ratchet 16 (convex link ratchet 16X). Is blocked (FIG. 8). This contact position is set closer to the stopper surface 16b next to the circular arc surface 16a of the link ratchet 16 (convex link ratchet 16X). In this state, when the downward swing of the control lever 20 continues, the restriction pin 20c on the control lever 20 moves away from the position restriction surface 25c of the second lowering prevention latch 25 and resists the force of the latch biasing spring 59. While accumulating the biasing force of the latch biasing spring 59, the control lever 20 rotates relative to the second lowering prevention latch 25 (FIGS. 8 and 9). Then, as shown in FIG. 9, when the engagement of the first lowering prevention latch 24 and the link ratchet 16 (convex link ratchet 16 </ b> X) is disengaged and the rotation restriction of the lifting link 10 is released, the seat bracket 13 is released at that moment. Lowers by its own weight (and the weight of the seated person). When the seat bracket 13 is lowered and the elevating link 10 swings in the downward direction, the meshing claw portion 25b of the second lowering prevention latch 25 that is in contact with the arc surface 16a by the urging force of the latch urging spring 59 remains in the arc surface. It slides along 16a and engages with the next stopper surface 16b to prevent the lifting link 10 from swinging in the downward direction (FIG. 9). That is, the lift link 10 swings in the downward direction by one tooth of the convex link ratchet 16X.

When the operation force of the control lever 20 is released after the stepped lowering operation for one tooth is completed, the control lever 20 returns to the neutral position by the force of the neutral position return spring 20a (FIG. 10). In the process of returning the control lever 20 to the neutral position, the restricting pin 20c pushes the position restricting surface 25c of the second lowering prevention latch 25 to separate the engaging claw portion 25b from the convex link ratchet 16X. The engagement claw portion 24c of the first lowering prevention latch 24 is engaged with the convex link ratchet 16X, and the lowering of the seat bracket 13 is prevented.

Therefore, each time the control lever 20 is swung once in the downward direction from the neutral position, the lift link 10 is lowered by one tooth by the upward direction motion transmission ratchet 23 and the convex link ratchet 16X.

In the above embodiment, the elevating link 10 is a toothed link in which the link pinion 15 and the link ratchet 16 are formed, but as shown in FIG. 11, the upper and lower pivot holes 11 and 12 are formed in the seat bracket 13 and the base portion 14. The lift link 10X pivotally mounted, the link pinion 15 and the link ratchet 16 are provided separately from the toothed link 10T pivotally mounted on the seat bracket 13 by the shaft 11X, and the links 10X and 20T are linked to each other. Even if it couple | bonds by 10C and the toothed link 10T and the raising / lowering link 10X rock | fluctuate interlockingly, this invention is materialized. Alternatively, a mode in which the toothed link and the lifting link are separate members and the toothed link is integrally coupled to the pivoting shaft 11S of the lifting link by shifting the axial direction position is also possible.

In the above embodiment, the control lever 20 that can be swung around the shaft is used as the input member, but a rotating handle can also be used. In addition, the present invention is applied to a stepped lifter device that is stepped up and down as described above, but a mode in which only a stepped lift device is used instead of a stepped portion in the descending direction is also possible. In the aspect of only the stepped raising device, the first lowering prevention latch 24 and the second lowering prevention latch 25 can be omitted.

Further, in the above embodiment, the link ratchet 16 positioned on the arc centered on the pivot shaft 11S on the seat bracket 13 side is formed on the lift link 10, but the link 14 on the base portion 14 side is pivotally mounted on the lift link 10. Even if the link ratchet located on the circular arc centering on the shaft 12S is formed, the present invention is established. In this aspect, the lifting link (toothed link) 10, the control lever 20, the lifting prevention latch 26, and the interlocking lever 29, which are mounted on the seat bracket 13 in the illustrated embodiment, the first lowering prevention latch 24, The first lowering prevention latch mechanism including the link ratchet 16, the second lowering prevention latch mechanism 25 including the second lowering prevention latch 25 and the link ratchet 16, and the upward direction rotation transmission including the upward direction motion transmission ratchet 23 and the motion transmission latch 27. What is necessary is just to install a mechanism in the base 14 side.

In the above embodiments, the present invention is applied to a vehicle seat lifting device, but the present invention can also be applied to a normal chair or work table (lifting body) lifting device.

The stepped lift device and the stepped lifter device according to the present invention lifts the lifting body in a stepped manner by the reciprocating swing between the neutral position and the raised position of the input member and the reciprocating swing between the neutral position and the lowered position. It can be lowered, and a device that does not have a complicated structure like a stepless lifter device and operates with low cost and configured by a combination of metal plate materials can be obtained. Is preferred.

10 Lifting link (toothed link)
10X Lifting link 10T Toothed link 10C Connecting link 11 12 Pivoting hole

11S

12S Pivoting shaft 13 Seat bracket (lifting body)
14 Floor bracket (base)
15 link pinion 16 link ratchet 16X convex link ratchet 16Y concave link ratchet 17 first auxiliary bracket 18 second auxiliary bracket 20 control lever (input member)
20a Neutral position return spring 20b Forced release protrusion 20c Restriction pin (interlocking part)
21 Shaft 22 Input pinion 23 Ascending direction motion transmission ratchet 23c Free running arc surface (free running section)
24 1st descent prevention latch 24c Engagement claw part 24d Forced release pin 25 2nd descent prevention latch 25b Engagement claw part 25c Position regulation surface (interlocking part)
26 Lift prevention latch 26a Engagement claw portion 27 Movement transmission latch 27a Shaft 27b Latch urging spring 27c Engagement claw portion 27d Forced release pin 28 Position restricting cam hole

28a Opening portion

28b Unlocking surface 29 Interlocking lever 29a Engaging protrusion 29b Bifurcated interlocking portion 46 Shaft 46a Latch energizing spring 59 Second latch energizing spring

Claims

A lifting link having a pivot point to the base and a pivot point to the lift;
A toothed gear pivotally attached to one of the base and the lifting body, having a link ratchet and a link pinion positioned on an arc centered on the pivoting shaft, and swinging in conjunction with the lifting link Link;
An input pinion that meshes with the link pinion is supported by a member on the side having the pivot shaft of the toothed link among the lifting body and the base so as to be swingable between a neutral position and a raised position. An input member; and at the neutral position of the input member, the toothed link engages with the link ratchet to prevent the toothed link from rising and swinging, and when the input member is swung in the upward direction, the toothed link A step-up device having a lift-preventing latch mechanism that allows movement.
The stepped lifting device according to claim 1, wherein the lift preventing latch mechanism has a meshing claw portion that meshes with the link ratchet, and is pivoted to a member on a side on which the toothed link is pivotally mounted. A stepped ascending apparatus having a prevention latch and a rise interlocking part that moves the rise prevention latch to a meshing position and a non-meshing position with a link ratchet in conjunction with a swing operation of the input member.
The stepped lifting device according to claim 1, further comprising an upward movement transmission ratchet supported so as to be capable of relative rotation with the input member coaxially with the swing shaft of the input member; A motion transmission latch supported by the input member, which meshes with the transmission ratchet and rotates the upward direction motion transmission ratchet together when the input member is lifted and swung from a neutral position; and the upward direction motion transmission ratchet A stepped ascending apparatus provided with an ascending direction stepped rotation transmission mechanism having an input pinion meshing with a link pinion of the toothed link that rotates in conjunction with the toothed link.
4. The stepped lifting device according to claim 3, wherein the input member is swung in the upward direction from the neutral position, and the motion transmission latch of the upward direction stepped rotation transmission mechanism is adjacent to the upward direction motion transmission ratchet. A step-up device that positions the meshing claw portion of the ascent prevention latch of the ascent prevention latch mechanism at a non-engagement position with the link ratchet while moving in the idle running section between the mating teeth.
In the stepped lifting device according to claim 1, the input member is further capable of swinging in a downward direction from a neutral position,
At the neutral position of the input member, it engages with the link ratchet to prevent the toothed link from swinging downward, and allows the toothed link to swing downward when the input member is swung downward. A first descent prevention latch mechanism; and a descent movement of the elevating link permitted to descent by the first descent prevention latch mechanism by one link ratchet, and a further descent movement of the elevating link. A stepped lifter device comprising: a second lowering prevention latch mechanism that meshes with the link ratchet to prevent it.
6. The stepped lifter device according to claim 5, wherein the second lowering prevention latch mechanism is a second lowering prevention latch rotatably supported by the input member; and the second lowering prevention latch is a link ratchet. A biasing spring that pivots and biases in the meshing direction; between the input member and the second lowering prevention latch that restricts the single pivoting of the second lowering prevention latch with respect to the input member by the biasing spring; A stepped lifter device comprising: a descent interlocking portion provided;
6. The stepped lifter device according to claim 5, wherein when the input member is swung in the upward direction from the neutral position, the first lowering prevention latch mechanism allows the toothed link to rotate, and the input member The stepped lifter device allows the toothed link to rotate when the lever is pivoted downward from the neutral position.
6. The stepped lifter device according to claim 5, wherein the link ratchet meshing with the first lowering prevention latch mechanism and the link ratchet meshing with the rising prevention latch mechanism are formed with the same tooth profile at the step formed on the toothed link. A stepped lifter device having a convex link ratchet and a concave link ratchet.
6. The stepped lifter device according to claim 5, wherein the diameter of the toothed link from the central axis of the link pinion and the link ratchet is different.
6. The stepped lifter device according to claim 5, wherein when the input member swings from the neutral position to the raised position and then returns to the neutral position, the first lowering prevention latch mechanism is provided with the toothed link. A stepped lifter device in which the rising prevention latch mechanism meshes with the link ratchet after preventing the downward swing.
6. The stepped lifter device according to claim 5, further comprising neutral position return means for returning the input member to a neutral position when an operating force applied to the input member is released.
6. The stepped lifter device according to claim 5, wherein the elevating link and the toothed link are the same member.
6. The stepped lifter device according to claim 5, wherein the elevating link and the toothed link are separate members and interlocked via a connecting link.
The stepped lifter device according to claim 5, wherein the lifting link and the toothed link are separate members, and the position of the lifting link in the axial direction is different from the shaft on the base side or the shaft on the lifting body side. A stepped lifter unit connected together.