JP3029596B2 - Lock mechanism for lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, moving a base plate on which a vehicle is mounted up and down, and when the vehicle is parked in two stages up and down, the vehicle supported on the base plate at an upper position is inclined or falls. The present invention relates to a lock mechanism of an elevating device that can prevent the possibility of the lifting device.

[0002]

2. Description of the Related Art As a conventional lock mechanism for a lifting device of this type, for example, a lock mechanism disclosed in Japanese Utility Model Registration No. 2535977 is known.

As shown in FIG. 13, this two-stage parking device 11 has a pair of columns 12a and 12b formed in an X-shape, and a central portion thereof is pivotally supported to be opened and closed. The plate 13 is supported so as to be able to move up and down. When the movable end 14 of one of the columns 12b moves in a substantially horizontal direction along the guide rail 15, the base plate 13 is moved and arranged at an upper position and a lower position.

As shown in FIG. 14, in the lock device of the two-stage parking device 11, when the columns 12a and 12b are rotated to close the legs and the base plate 13 is moved to the upper position, the moving ends of the columns 12b are moved. The portion 14 moves along the guide rail 15 and approaches the engagement pins 16 provided on both side walls of the guide rail 15. Then, as shown in FIG.
A hook 19 formed at the tip of a hook 18 rotatably attached to a support pin 17 at the lower end of 2b is engaged with the engaging pin 16, and the base plate 13 is hooked and held at the upper position. Is done. Accordingly, the base plate 13 is held at the upper position so as not to drop unnecessarily.

[0005]

However, in the lock device of the conventional two-stage parking device 11, the support 12
a and 12b, the moving end 14 is
, The engaging hook 18 and the engaging pin 16 are engaged, and the base plate 13 is indirectly engaged and held at the upper position.
Therefore, when the base plate 13 is moved to the upper position, for example, when a portion supporting the columns 12a and 12b is hindered, the engaging hook 18 and the engaging pin 16 can be engaged. However, there is a problem that the base plate 13 cannot be hooked and held at the upper position.

In addition, since the movable end 14 moves horizontally on the guide rail 15, if the dust accumulates on the guide rail 15, the movable end 14 may not operate smoothly. Therefore, there is a problem that the movable end 14 cannot move along the guide rail 15 and the hook 18 and the engaging pin 16 cannot be always engaged in a stable state.

The present invention has been made by paying attention to such problems existing in the prior art. The purpose is to hold and hold the base plate at the upper position,
It is an object of the present invention to provide a lock mechanism of an elevating device capable of directly hanging and holding a base plate when a support mechanism for supporting the base plate is abnormal, thereby reliably preventing the base plate from falling.

Another object of the present invention is to provide a lock mechanism of an elevating device capable of operating the lock mechanism smoothly when the base plate is latched and held at the upper position, and capable of latching and holding the base plate in a stable state at all times. To provide.

[0009]

According to a first aspect of the present invention, there is provided a lock mechanism for a lifting device, comprising: a pair of columns provided on the left and right; It is arranged so as to be able to move the base plate up and down between an upper position and a lower position by a support plate for supporting the vehicle and a support member for supporting the base plate, which is stretched between left and right supports. The supporting mechanism, the hook member rotatably supported on the side of the base plate, and fixed to the side surface of the column, when the base plate falls from the upper position, the hook member is engaged A lock member for preventing the base plate from dropping; and a lock member provided on a side of the support post above the lock member, wherein the hook member is engaged with the lock member when the hook member moves further upward from the upper position.
Is lifted up by the hook member that has been released and turned,
When the base plate reached the uppermost position, the hook member was released from the hook member , rotated in the opposite direction to the above, and the hook member was lowered.
When the lock member and the hook member are not
And a hook release member.

According to a second aspect of the present invention, there is provided a lock mechanism of the lifting device, wherein the hook member is constantly urged in the direction of the lock member by an urging member.

[0011] locking mechanism of the lifting apparatus of the invention described in claim 3 is the invention according to claim 1 or 2, wherein the hook releasing member, said off when the base plate has reached the uppermost position
Hook member is released from the hook member, and the hook member descends due to its own weight.
Lock member and hook member are not engaged again
It turns in the direction which restricts this.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. In this embodiment, a case where a lock mechanism is attached to a two-stage parking device as a lifting device will be described.

As shown in FIGS. 1 and 2, a pair of right and left columns 20a, 20b and 20c, 20d each have a substantially U-shaped cross section, and the substrate 2 is arranged so that the opening faces inward.
It stands upright at the four corners. A vehicle such as a passenger car enters and is mounted on the substrate 21. Further, metal reinforcing stays 23a, 23b are provided between the pair of front and rear columns 20a, 20c and 20b, 20d. The base plate 24 on which the vehicle is mounted is composed of left and right columns 20a, 20b and 20c, 2
0d, and can be moved up and down by a support mechanism by a chain 25 as a support member described later.

The pair of guide plates 26 are formed of a metal plate, and the side cross section is formed in a right-angled triangular shape having a long hypotenuse. This facilitates entry of the vehicle onto the base plate 24. The protrusions 27 are provided on the left and right side edges and the rear edge of the base plate 24, and allow the driver to recognize that the position of the tire of the vehicle is at the end of the base plate 24.

The motor accommodating case 28 is mounted on one of the rear columns 20c, and accommodates a motor (not shown) for driving the chain 25 therein. The rotating shaft housing case 29 is formed in a long rectangular parallelepiped shape, one end is joined to the side surface of the motor housing case 28, and the other end is mounted on the front pillar 20a on one side. The driven gear 22 is housed at the other end in the rotating shaft housing case 29. The rotating shaft 29a for transmitting the rotating force is provided between the motor and the driven gear 22 in the rotating shaft housing case 29, and transmits the rotational driving force of the motor to the driven gear 22.

The switch 30 is provided on the front column 20a on one side. When the switch 30 is pressed, the motor starts and the chain 25 is turned on.
You can wind up and rewind. The drive-side reinforcing stay 23a on which the motor or the driven gear 22 is provided is made of metal, and has two drive-side supports 20a, 2b.
The columns 20a and 20c are connected to each other via a reinforcing plate 31 shown in FIG.

As shown in FIG. 2 and FIG. 7, a pair of first chains 25a is connected to a pair of right and left columns 20a, 20b and 20, respectively.
c, 20d, one end of which is fixed to the upper ends of the driven columns 20b, 20d without the motor or the rotating shaft 29a, descends along the columns 20b, 20d, and moves forward and backward of the driven plate 24. The first sprockets 32 attached to the side edges are engaged with the lower sides of the pair of first sprockets 32, respectively. The pair of second sprockets 3 pass under the base plate 24 and are attached to the front and rear side edges of the drive side base plate 24.
3 and the third sprocket 34, and the second sprocket 33 applies tension to the first chain 25a.
The first chain 25a is connected to the driving-side support columns 20a, 2a.
0c, from which it descends along their columns 20a, 20c and is fixed at their lower ends.
As a result, even if the base plate 24 moves up and down, a horizontal state can always be maintained.

A pair of front and rear second chains 25b are disposed on the driving columns 20a and 20c, respectively. One end of each second chain 25b is connected to one of the columns 20a, 20c.
The fixed to the upper end, their posts 20a, down along the 20c, the front and rear edges of the drive side of the base plate 24, a pair of which is attached to the upper position of the second and third spray rocket 33 The fourth sprocket 35 is engaged so as to go below.

[0019] Then, the post 20a, up along 20c, and is meshed with a pair of fifth sprocket 36 mounted at an angle above the fourth spray rocket 35. Further, the second chain 25b rises upward along the columns 20a and 20c, and is meshed with the motor or the driven gear 22 from above. The fifth sprocket 36 applies tension to the second chain 25b. And pillar 2
0a, 20c, and descends along the struts 20a, 20c.
The sixth sprocket 6 supported so as to be able to move up and down along c
9 and further rises upward along the columns 20a, 20c and is fixed to the upper ends thereof.

For example, when the motor is rotated when the base plate 24 is at the lowermost position, the rotational force is applied to the rotating shaft 2.
The motor and the driven gear 22 rotate counterclockwise in FIG. 2, and the second chain 25b is pulled up, and at the same time, the base plate 24 is raised. At this time, the sixth sprocket 69 is lowered downward along the columns 20a and 20c by the amount that the second chain 25b engaged with the fourth sprocket 35 is pulled up.

As shown in FIG. 3 or FIG. 4, a C-shaped steel 37 having a C-shaped cross section made of metal is joined to one side edge of the base plate 24 on the driving side. The side plate 38 is formed of a metal in a U-shape, and is provided with a C-shaped steel 37 through a mounting plate 39.
Is joined to. A hook member 42 formed in a substantially T-shaped side surface is formed in a support hole 40 formed on both sides thereof.
Are rotatably supported at both ends.

The hook member 42 is formed in an inverted U shape by a round bar, and the lower portion is fixed to the upper peripheral surface of the support shaft 41, and the upper portion extends obliquely upward. Hook release lever 4
Reference numeral 3 denotes a round bar formed in a horizontal L-shape,
Is joined to one side of the upper end. One end of a coil spring 44 as an urging member is fixed to a fixed plate 45 provided on the lower surface of the base plate 24, and the other end is attached to a lower end of the support shaft 41. And this coil spring 4
Numeral 4 always urges the hook member 42 toward the driving columns 20a and 20c. At this time, the support shaft 41
The contact portion 41a at the lower end of the contact member comes into contact with the side plate 38. The side plate 38 and the contact portion 41a form a position regulating portion 38a, so that the position where the hook member 42 engages with a lock member described later is reliably maintained.

The square plate-shaped interposition member 46 is joined to the upper surface of the drive-side reinforcing stay 23a. The lock member 47 is formed in a substantially triangular plate shape by a metal,
It is joined to the upper surface of the interposition member 46 so as to correspond to 2. In addition, an engagement recess 48 is provided at the upper end, and can be engaged with the hook member 42. Guide rod 49
Is formed into an elongated shape by a round bar, a lower portion thereof is joined to one side surface of the lock member 47, and an upper portion extends straight upward. When the base plate 24 rises, the hook member 42 is guided straight upward.

The bottom plate 50 is formed of a metal in the shape of a square plate, and is fastened and fixed to the upper surface of the interposition member 46 on the side to which the hook release lever 43 is joined by a bolt 51. The support plate 52 is formed of metal, and its lower edge is joined to the upper surface of the bottom plate 50. Guide member 5
Numeral 3 is formed by bending a metal plate into a U shape, and is joined to the inner surface of the support plate 52. Also, the guide member 53
Extends below the engagement concave portion 48 of the lock member 47, and after the hook release lever 43 has passed through the guide member 53, the hook member 42 moves toward the lock member 47 by the urging force of the coil spring 44, and again. Lock member 4
7 is not engaged.

The hook releasing member 55 is formed in a substantially mountain shape by a metal plate, and one end thereof is provided on the inner surface of the support plate 52.
It is rotatably supported by a mounting bolt 56 and a collar 57, and a contact surface 58 is formed at the other end. Then, the contact surface 58 always comes into contact with the upper end of the guide member 53. Therefore, when the hook member 42 is pushed up from below, the hook release member 55 in which the contact surface 58 is in contact with the upper end of the guide member 53 is pushed up by the hook release lever 43, and in FIG. 8, the hook member 42 can be further moved upward as shown in FIG. Thereafter, when the hook member 42 reaches the uppermost position, the hook release member 55 is released from the locked state of the hook release lever 43, the hook release member 55 rotates counterclockwise by its own weight, and the contact surface 58 is guided. It contacts the upper end of the member 53. As a result, the path in the direction of the lock member 47 is closed, and when the hook member 42 descends, the lock member 47 and the hook member 42 are not engaged again.

In this case, when the contact surface 58 is in contact with the guide member 53, the inclined surface 59 at the tip of the hook release member 55 extends obliquely downward toward the base plate 24. When the hook member 42 descends from above to below, the hook release lever 43 is moved by the inclined surface 59 at the tip of the hook release member 55 and the guide member 53.
The hook member 42 is guided from above to below so as not to engage with the lock member 47 again.

As shown in FIG. 11, the locking portion 60 has a substantially inverted U-shape, and has a lower portion fixed to the other side edge of the base plate 24 and an upper portion extending obliquely upward. As shown in FIGS. 5, 6, and 10, the mounting member 61 is fixed to the outside of the driven columns 20b, 20d by bolts 62, and has an inverted L-shaped mounting portion extending downward at the upper portion thereof. 63 is formed to protrude. Plate-shaped engaging body 64
Is rotatably supported by a support pin 65 between the mounting member 61 and the mounting portion 63, and has a hook 6 at the lower end thereof.
6 engages with the locking portion 60. The coil spring 67 is locked by the engaging body 64 and constantly urges the engaging body 64 toward the locking portion 60 side.

The interlocking member 68 has one end joined and fixed to the upper end of the engaging body 64, extends upward and is bent inward,
Furthermore, it is bent toward the driven columns 20b and 20d,
The other end is in contact with the first chain 25a. Then, the engagement body 64 is always held at the hanging position against the urging force of the coil spring 67. Should the first chain 25a break, the interlocking member 68 moves outward as shown by the two-dot chain line in FIG. Then, as shown in FIG. 11, the engagement body 64 is rotated so that the hook 66 at the lower end protrudes inward to be able to engage with the locking part 60.

Next, the operation of the lock mechanism of the lifting device according to this embodiment will be described. Now, as shown in FIG. 12, the vehicle enters the base plate 24 via the guide plate 26 with the base plate 24 at the lowermost position. Next, when the switch 30 is pressed, the motor is driven to rotate, and the driven gear 22 is also rotated via the rotating shaft 29a.
As shown in (2), the second chain 25b is wound up. At the same time, the fourth sprocket 35 moves up together with the fifth sprocket 36, and the base plate 24 supported by the second chain 25b rises.

At this time, the base plate 24 can always be kept horizontal by the first chain 25a. When the base plate 24 reaches the upper position, the driving of the motor stops, and the base plate 2
4 stops rising. In this case, as shown in FIG. 3, the driving-side support 2 to which the motor and the driven gear 22 are attached is attached.
In FIGS. 0 a and 20 c, the hook member 42 attached to the side edge of the base plate 24 is in a state of abutting on the guide rod 49 located slightly above the engagement recess 48 of the lock member 47.

At this time, the brake mechanism of the motor
The base plate 24 can hold the stopped state at the upper position, and the vehicle is prevented from falling or tilting. Should the brake mechanism of the motor fail, the first and second chains 25a, 25b
When the hook breaks, the hook member 42 descends along the guide rod 49 and engages with the engaging concave portion 48 of the lock member 47 supported by the driving-side reinforcing stay 23a. Therefore,
It is possible to prevent the vehicle from falling due to the fall or inclination of the base plate 24.

Further, since the engaging body 64 is rotatably provided on the other side edge of the base plate 24, if the first chain 25a is broken, the two-dot chain line in FIG. As shown in FIG. 7, the interlocking member 68 moves outward,
Is rotated so that the hook portion 66 at the lower end protrudes inward, and becomes capable of engaging with the locking portion 60 on the other side edge of the base plate 24. Therefore,
When the base plate 24, which is no longer supported by the first chain 25 a, falls, the locking portion 60 on the other side edge of the base plate 24 is engaged with and supported by the hook portion 66 of the engaging body 64.

When the base plate 24 is at the upper position, another vehicle can enter on the substrate 21 and the vehicle can be parked in two steps up and down. Next, when lowering the base plate 24 at the upper position and lowering the vehicle, first, the lower vehicle is moved from above the substrate 21 to outside the parking device. Next, the switch 30 is operated to slightly move the base plate 24 upward. At this time, the hook release member 55 is pushed up from below by the hook release lever 43 joined to one side of the hook member 42, and rotates clockwise to move the hook member 42 further upward. Then, as shown by the solid line in FIG. 8 or the two-dot chain line in FIG. 9, the hook member 42 reaches the uppermost position and moves above the hook releasing member 55, and then, as shown by the solid line in FIG. 55 rotates counterclockwise by its own weight, and its contact surface 58 contacts the upper end of the guide member 53. As a result, the path in the direction of the lock member 47 is closed, and the lock member 47 and the hook member 42 do not engage again.

Subsequently, the switch 30 is operated to rewind the second chain 25b, and the base plate 24 is lowered. At this time, the hook release lever 43 joined to one side of the hook member 42 contacts the inclined surface 59 at the tip of the hook release member 55 and the upper surface of the guide member 53 to guide the hook member 42 downward. Therefore, the hook member 42 is
The base plate 24 can be lowered to the lowermost position without being engaged with the base plate 24. Then, as shown in FIG.
When 4 reaches the lowermost position, the motor stops and the vehicle can be moved out of the parking device via the guide plate 26.

As described above, according to this embodiment, the following effects can be obtained. In the lock mechanism of the elevating device of this embodiment, the base plate 24
When the support mechanism for supporting the base plate 24 is abnormal, the hook member 42 provided directly on the base plate 24 and the lock member 47 provided on the drive-side reinforcing stay 23a are engaged, so that the base plate 24 And the fall of the base plate 24 can be reliably prevented.

In the lock mechanism of the lifting device according to this embodiment, the hook member 42 is formed in an inverted U-shape by a round bar, so that the hook member 42 can be securely engaged with the engagement concave portion 48 of the lock member 47. In the lock mechanism of the lifting device of this embodiment, when the contact surface 58 of the hook release member 55 is in contact with the guide member 53, the inclined surface 59 at the tip of the hook release member 55
It is inclined obliquely downward toward the guide member 53. Therefore, by guiding the hook release lever 43 joined to one side of the hook member 42 on the inclined surface 59 at the tip of the hook release member 55, the lock member 47 is avoided via the inclined surface 59 and the guide member 53. The hook member 42 can be guided downward.

In the lock mechanism of the lifting device according to this embodiment, when the hook member 42 is pushed up to the upper part of the guide rod 49, the tip of the hook release member 55 rotates counterclockwise, and the contact surface thereof 58 contacts the upper end of the guide member 53 to close the path in the direction of the lock member 47. Therefore, when the base plate 24 descends, the hook member 42 can be prevented from being engaged with the lock member 47 again.

In the lock mechanism of the lifting device according to the present embodiment, the hook member 42 is always urged toward the lock member 47 by the coil spring 44 as the urging member. Therefore, when the base plate 24 falls, the hook member 4
2 can be reliably engaged with the lock member 47, and the vehicle can be prevented from falling.

In the lock mechanism of the lifting device according to this embodiment, since the hook releasing member 55 is rotated by its own weight, the number of components can be reduced and the number of components can be reduced as compared with the case where the hook releasing member 55 is biased by using a biasing member or the like. In addition, the manufacturing cost can be reduced.

In the lock mechanism of the elevating device of this embodiment, the contact portion 41a at the lower end of the support shaft 41 to which the lower portion of the hook member 42 is fixed contacts the side plate 38, and the contact portion 41a contacts the side plate 38. A position regulating portion 38a is formed. Therefore, the hook member 42 between the base plate 24 and the driving columns 20a, 20c can be always maintained at a predetermined position,
When the base plate 24 falls, the hook member 42 can be securely engaged with the lock member 47.

In the lock mechanism of the lifting device according to this embodiment, since the guide bar 49 is joined to the side surface of the lock member 47, the hook member 42 that has moved from below can be guided straight upward.

In the lock mechanism of the elevating device of this embodiment, the lower end of the guide member 53 extends below the engagement recess 48 of the lock member 47. by the urging force of the coil spring 44, to move the locking member 47 sides to direction, it is possible to prevent the engaging the locking member 47 again.

In the lock mechanism of the elevating device of this embodiment, when the interlocking member 68 is in contact with the first chain 25a, the interlocking member 68 causes the engaging body 64 to be moved by the coil spring 67.
The engaging body 64 is held in the hanging position against the urging force of the above. Therefore, only when the first chain 25a is broken, the engaging body 64 is moved to the locking part 60 side, and the locking part 60 and the engaging body 64 are engaged, thereby preventing the vehicle from dropping and tilting due to the fall of the base plate 24. can do.

Incidentally, the present invention can be embodied by changing the form as follows. -Bottom plates 50 are attached to both sides of the upper surface of the interposition member 46, and the support plates 52 are joined thereon. Both support plates 52
And a hook release member 55 is rotatably supported by a mounting bolt 56 and a collar 57, respectively. Further, the hook release lever 43 is joined to both side surfaces of the upper end of the hook member 42.

In the case of such a configuration, the hook member 42
Is guided downward, a pair of hook release levers 43
Are guided by the inclined surface 59 at the tip of the hook release member 55 and the guide member 53, respectively, so that the hook member 42 can be reliably and securely guided downward.

The coil spring 44 as the urging member for urging the hook member 42 is changed to a leaf spring or rubber. Also in this configuration, the hook member 42 can be urged toward the lock member 47, and when the base plate 24 falls, the hook member 42 is
7 can be reliably engaged.

The locking portion 6 fixed to the other side edge of the base plate 24
0, and the engaging bodies 64 provided on the driven columns 20b and 20d are omitted. In the case of such a configuration,
Even if the first chain 25a is broken, the locking mechanism provided on the driving side can prevent the base plate 24 from falling or tilting.

First and second chains 2 as support members
Use wires or the like instead of 5a and 25b. Also in the case of such a configuration, the base plate 24 can be reliably moved up and down.

One or three or more lock members 47 are provided on the driving-side reinforcing stay 23a, and one or three or more hook members 42 are provided on the side edges of the base plate 24 at positions corresponding to the lock members 47. thing.

With this configuration, if the base plate 24 falls, the fall of the base plate 24 can be more reliably prevented, and the vehicle can be prevented from falling or tilting on the base plate 24. Further, technical ideas that can be grasped from the embodiment will be described below.

The lock mechanism of the lifting device according to claim 2, wherein the urging member is a coil spring, one end of which is fixed to a lower surface of the base plate, and the other end of which is fixed to a lower end of the hook member. With this configuration, the hook member can always be urged toward the lock member, and if the base plate falls, the hook member is securely engaged with the lock member, and the vehicle falls on the base plate. Alternatively, inclination can be prevented.

The lifting device according to any one of claims 1 to 3, wherein the locking member is formed in a plate shape, and an engagement concave portion is provided at an upper end thereof for engaging with a hook member formed in an inverted U shape. Device locking mechanism.

With this structure, the hook member can be securely engaged with the lock member, and the lock member can be easily manufactured. The lock mechanism according to any one of claims 1 to 3, further comprising a guide member formed on a side surface of the lock member so as to extend straight upward and guiding the hook member.

With this configuration, when the base plate moves upward, the hook member can be guided straight upward. The locking mechanism of the lifting device according to any one of claims 1 to 3, wherein the hook releasing member is formed in a mountain shape having an inclined surface such that a tip side becomes lower toward the base plate.

With this configuration, when the hook member descends, the hook member is guided by the inclined surface at the tip of the hook releasing member, and can be moved downward so as not to engage with the lock member again.

The lock mechanism of the lifting device according to any one of claims 1 to 3, wherein a guide member for guiding the hook member downward is provided on a reinforcing stay provided between the front and rear columns. With this configuration, the hook member guided by the hook release member can be further guided downward by the guide member so as not to engage with the lock member.

The lock mechanism of the lifting device according to any one of claims 1 to 3, wherein the lower end of the hook member and one side edge of the base plate constitute a position regulating portion for regulating the position of the hook member.

In this configuration, the hook member between the base plate and the driving-side support can always be maintained at a predetermined position, and the hook member is securely engaged with the lock member when the base plate is moved up and down. be able to.

[0059]

The present invention is configured as described above, and has the following effects. According to the lock mechanism of the lifting device according to the first aspect of the invention, when the support mechanism supporting the base plate is abnormal in a state where the base plate is hooked and held at the upper position, the base plate is directly locked. It can be stopped and held, and the falling of the base plate can be reliably prevented. Further, when the base plate is hooked and held at the upper position, the lock mechanism can be smoothly operated, and the base plate can be hooked and held always in a stable state.

According to the lock mechanism of the lifting device according to the second aspect of the present invention, in addition to the effect of the first aspect, the hook member is formed by a coil spring as an urging member.
It is always urged toward the lock member. Therefore, when the base plate falls, the hook member can be securely engaged with the lock member, and the vehicle can be prevented from falling.

According to the lock mechanism of the lifting device according to the third aspect of the present invention, in addition to the effect of the first or second aspect of the invention, the lock mechanism is compared with the case where the biasing member is used to urge. Thus, the number of parts can be reduced, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a base plate of a two-stage parking device is in an upper position.

FIG. 2 is a front view showing a state of the chain when the base plate is at an upper position.

FIG. 3 is a main part rear view showing a state of the lock mechanism when the base plate is at an upper position.

FIG. 4 is an essential part front view showing the state of the lock mechanism when the base plate is at the upper position.

FIG. 5 is a partial perspective view showing a relationship between an interlocking member and a first chain.

FIG. 6 is a partial perspective view showing a state where the engagement body is viewed from the outside.

FIG. 7 is a front view showing the state of the chain when the base plate is at the lower position.

FIG. 8 is a main part rear view showing the state of the lock mechanism when the base plate is moved upward.

FIG. 9 is a main part rear view showing a state of the lock mechanism when the base plate is moved downward.

FIG. 10 is a partial plan sectional view showing the relationship between the interlocking member and the first chain.

FIG. 11 is a partial perspective view showing a state in which the engagement body has rotated.

FIG. 12 is a perspective view showing a state where a base plate of the two-stage parking device is at a lowermost position.

FIG. 13 is a side view showing a conventional two-stage parking device.

FIG. 14 is a partial cross-sectional view showing an operation process in which the hook engages with the engagement pin.

FIG. 15 is a partial sectional view showing a conventional two-stage parking device.

[Explanation of symbols]

20a, 20b, 20c, 20d: support, 24: base plate,
25a: a first chain as a support member; 25b: a second chain as a support member; 42, a hook member;
Coil springs as urging members, 47: lock members, 55: hook release members.

Claims (3)

(57) [Claims] 1. A pair of struts provided on the left and right sides, a base plate arranged between the left and right struts so as to be vertically movable and supporting a vehicle, and stretched between the left and right struts to support the base plate. A support mechanism for vertically moving the base plate between an upper position and a lower position by a support member for; a hook member rotatably supported on a side of the base plate; and a side surface of the support post. A lock member that is fixed and is engaged with the hook member to prevent the base plate from falling when the base plate falls from the upper position; and when moved further upward from the position, the
Pivots pushed up to the hook member engages is released the lock member, when the base plate has reached the uppermost position, the
Released from the hook member to pivot in a direction opposite to the above, full
When the lock member descends, the lock member and the hook member
And a hook release member for preventing the engagement device from being engaged . 2. The lock mechanism according to claim 1, wherein the hook member is constantly urged toward the lock member by an urging member. 3. The hook release member is released from the hook member when the base plate reaches the uppermost position, and when the hook member is lowered by its own weight , the lock member and the hook portion are released.
3. The lock mechanism according to claim 1, wherein the lock mechanism rotates in a direction that restricts the member from being re-engaged .