JP2002276181A - Two-stage parking system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-stage parking system in which both the breakage of either one of paired chains and things being caught under pallets can be detected. SOLUTION: This two-stage parking system is provided with an urging detecting mechanism 60 positioned above the paired chains 51 and 51 which support pallets in hung state. The mechanism 60 is provided with a bracket 61 fixed to one chain 51 and an urging member 62 displaceably assembled with the bracket 61. A coil spring 63 is interposed between the member 62 and bracket 61 and elastically urges the chains 51 and 51 in the direction in which the chains 51 and 51 are brought nearer to each other. When the chains 51 and 51 approach each other, the urging detecting mechanism 60 detects it by detecting the displacement of the urging member 62 by means of a detection switch 64 assembled with the bracket 61.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage type parking device having a pallet on which a vehicle is mounted on a column standing upright on a base surface so as to be able to move up and down. The present invention relates to a mechanism for detecting looseness of a chain in a two-stage parking device that has been used.

[0002]

2. Description of the Related Art Conventionally, a two-stage parking apparatus of this type includes a column standing upright on a base surface, a pair of sprockets which are coaxially rotatably supported by the column and rotate simultaneously.
An intermediate part is wound around each of the pair of sprockets, and a pair of chains is connected to the pallet at one end side. The motor drives the pair of sprockets to move the pallet up and down. is there.

Further, as disclosed in Japanese Patent Application Laid-Open No. 54-140343, for example, in an elevating device in which an elevating frame is raised and lowered by a pair of chains, a proximity switch is provided on one of the pair of chains. Attach the operation member opposite to the proximity switch to the other and assemble the other, elastically urge both chains, and detect a change in the relative position between the proximity switch and the operation member to thereby determine the position of the pair of chains. Some have been designed to detect that either of them has been cut.

[0004]

However, if the two-stage parking device employs a means for detecting the breakage of the chain in the elevating device, it is possible to detect that one of the pair of chains has been broken. If both chains are loosened with an object sandwiched under the pallet, this cannot be detected because the relative positions of the proximity switch and the operation member mounted on both chains do not change.

SUMMARY OF THE INVENTION The present invention has been made to address the above problems, and an object of the present invention is to detect both a break in one of a pair of chains and a situation in which an object is sandwiched under a pallet. An object of the present invention is to provide a two-stage parking device that can be used.

[0006]

SUMMARY OF THE INVENTION The structural feature of the present invention is that
In a two-stage parking device including a pair of sprockets and a pair of chains, the two-stage parking device elastically urges the pair of chains in a direction of approaching each other to detect that the pair of chains approach each other. There is provided an urging detection mechanism for detecting that one of the pair of chains is loose and that both of the pair of chains are loose. According to this, by detecting that one of the pair of chains is loosened, it is possible to detect that one of the chains has been broken, and by detecting that both of the pair of chains are loosened, It is possible to detect that an object has been sandwiched under.

In the above case, the urging detecting mechanism is constituted by a bracket fixed to only one of the pair of chains, and a spring which is displaceably assembled to the bracket and interposed between the bracket and the bracket. An urging member pressed against the other of the pair of chains; and a detection switch fixed to the bracket and detecting displacement of the urging member with respect to the bracket, wherein the detection switch displaces the urging member. , It may be configured to detect that the pair of chains approach each other. According to this, a two-stage parking device having the above-described structural features of the present invention can be configured with a simple configuration using only one detection switch.

Another structural feature of the present invention is that, in a two-stage parking device including the support portion, a pair of sprockets, and a pair of chains, the pair of chains are elastically biased. There is provided an urging detecting mechanism for detecting each slack of the pair of chains. In this case, the urging detection mechanism is a pair of urging members that are respectively displaceably assembled to the support portions and are pressed against the pair of chains by a pair of springs to elastically urge the pair of chains. And a pair of detection switches fixed to the support portion for detecting the displacement of the pair of urging members with respect to the support portion, respectively, and the displacement of the pair of urging members is respectively detected by the pair of detection switches. By doing so, it is preferable to detect each slack of the pair of chains. This can also detect that one of the chains has been broken and that an object has been sandwiched beneath the pallet.

[0009]

DETAILED DESCRIPTION OF THE INVENTION a. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The two-stage parking device shown in FIGS. 1 to 7 is a pallet on which a vehicle is mounted while being guided and supported so as to be able to ascend and descend through a supporting portion 10 erected on a base surface G via a lifting member 20. 30.

As shown in detail in FIG. 2, the support portion 10 includes a pair of left and right masts 12, 12 which are erected and fixed on a base surface G inside a cover 11, and between the masts 12, 12. And a plurality of cross beams 13 to be connected. Prop part 10
Is provided with an operation box (not shown) provided with an operation elevating switch.

The elevating member 20 has a pair of left and right support arms 21 and 21 respectively connected to the fork portions 31 and 31 of the pallet 30 to support the pallet 30 in a cantilever manner, and a slit 11 a provided in the cover 11 of the column 10. A pair of upper and lower connecting plates 22, 22 which penetrate into the cover 11 to connect the two support arms 21, 21 are provided. Guide plates 23, 23 are fixed inside the support arms 21, 21, respectively. The elevating member 20 includes a pair of upper and lower vertical guide rollers (not shown) and horizontal guide rollers 24 provided on the respective guide plates 23. , 24, and are supported by the masts 12, 12 so as to be able to move up and down.

An elevating device 40 for elevating the elevating member 20 is accommodated in the cover 11 of the column 10. As shown in detail in FIGS.
A pair of fixed sprockets 41, 4 on the left and right
1, a pair of left and right (only one is shown) first guide sprockets 42 connected to the pallet 30 via the arms 21, 21 and the connecting plate 22, and a pair of right and left (only one is shown) connected to the weight W. ) And a second guide sprocket 43). The fixed sprockets 41, 41
A pair of chains 47, 47, drive sprockets 48, 48, and a rotating shaft 45 are fixed to the outer periphery of a rotating shaft 45 rotatably supported by a pair of side wall plates 44, 44 on the motor 3. And is simultaneously rotated left and right. In addition,
In the vicinity of the chains 47, 47, each chain 4
Detection switches 49, 4 for detecting disconnection of 7, 47
9 are provided.

Each pair of sprocket groups 41, 42, 4
3, 41, 42, 43, a pair of chains 51, 51
Is being wrapped around. Each of the chains 51 is attached to a front plate 52 fixed at one end to the front side of the side wall plates 44, 44.
3 and then the first guide sprocket 4
2 from below to support the pallet 30 under suspension, then engage with the fixed sprocket 41 from above,
The other end is attached to the support 10 after engaging the guide sprocket 43 from below and suspending and supporting the weight W.
The attachment member 53 includes a lower end portion of the front plate 52 and each chain 5.
A pair of front and rear flat plates 53a, 53 sandwiching the upper end of
The upper end of each of the chains 51, 51 is rotatably mounted on the left and right sides of the front plate 52 at the center thereof. I have.

An upper part of the pair of chains 51, 51 is provided with an urging detecting mechanism 60 for detecting the slack. As shown in detail in FIGS. 6 and 7, the biasing detection mechanism 60 includes a bracket 61 including a front plate 61a and first and second back plates 61b and 61c. Bracket 61
Is screwed and fixed to the same chain 51 with one (right side in the figure) chain 51 interposed between one end of the front plate 61a and the first back plate 61b. The other end of the front plate 61a is bent rearward and is welded and fixed at the front end to an intermediate portion of the second back plate 61c.
The other (left side in the figure) chain 51 is slidably slidable in the left-right direction between 1c.

A rod-shaped urging member 62 having flanges 62a and 62b formed at both ends penetrates the bent portion 61a1 of the front plate 61a so as to be displaceable in the left-right direction. Urging member 6
2 is one flange 62a formed on the chain 51 side.
A coil spring 63 is interposed between the first chain 51 and the bent portion 61a1 of the front plate 61a.
1 and 51 are elastically urged in a direction to approach each other. A detection switch 64 is attached to an end of the back plate 61c opposite to the side sandwiching the other chain 51. The detection switch 64 has a detection roller 64a elastically contacted with the other flange 62b of the urging member 62, and detects the displacement of the urging member 62 by the displacement of the detection roller 64a.

In the two-stage parking device constructed as described above, when the fixed sprockets 41, 41 are driven to rotate by the motor 46, the first guide sprockets 42, 42 suspended and supported by the chains 51, 51 and the pallet. 30 rises or falls according to the rotation direction of the prime mover 46. In this case, during normal operation, the chains 51, 51
Are kept in parallel at each position because a predetermined tension is applied by the load of the pallet 30, and the distance between the two chains 51, 51 in the part provided with the urging detecting mechanism 60 is also the urging member 62. Is maintained at a predetermined distance against the urging force (the state shown in FIG. 6).

On the other hand, when one of the pair of chains 51, 51 is broken due to wear or the like, the broken chain 51 is released from the load on the pallet 30 and becomes loose. In the portion provided, the chain 51 which has been cut by the urging by the urging member 62
Are displaced toward the other chain 51 and both chains 51, 5
1 becomes shorter (FIG. 7 shows a state in which the left chain 51 is loosened). Also, when an object is sandwiched under the pallet 30 when the pallet 30 is lowered, the pallet 3
Since the lowering of zero is restricted and both chains 51, 51 are both loosened, the distance between both chains 51, 51 at the portion where the urging detection mechanism 60 is provided becomes shorter. Then, in each case, when the distance between the two chains 51, 51 becomes short, the urging member 62 is displaced with respect to the bracket 61,
The detection switch 64 detects this.

Therefore, in the above embodiment, it is possible to determine whether one of the pair of chains 51, 51 is loose or both are loose with a simple configuration using only one detection switch 64. Is detected, and one of the chains 51, 51 is broken and the pallet 30
It is possible to detect that an object is sandwiched beneath. b. Second Embodiment Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. This embodiment, as shown in FIGS.
An urging detecting mechanism 70 is employed in place of the urging detecting mechanism 60 in the first embodiment.

The urging detecting mechanism 70 includes a pair of brackets 71, 71 fixed to the side walls 44, 44, respectively. As shown in detail in FIG. 10, the brackets 71, 71 are provided with biasing members 72, 72 having an L-shaped cross section so as to be rotatable up and down around pins 74, 74 via arms 73, 73, respectively. It is assembled. Each biasing member 72
Are provided with coil springs 76, 76 between the support plates 75 fixed to the side walls 44, 44, respectively.
1, the chains 51 are elastically urged rearward. Brackets 71, 7
1 are provided with detection switches 77 and 77, respectively. The detection switches 77, 77
Detection rollers 77a, 77a are elastically brought into contact with the upper edges of the support members 3, 73, and the urging members are detected by detecting the displacement of the arms 73, 73 with respect to the column 10 by the displacement of the detection rollers 77a, 77a. 72, 72 are respectively detected.

In the two-stage parking device constructed as described above, when one of the pair of chains 51, 51 is broken due to wear or the like, the broken chain 51 is released from the load of the pallet 30. In the portion where the urging detection mechanism 70 is provided, the broken chain 51 is displaced rearward by the urging by the urging member 72 (the state shown in FIG. 10). Pallet 3
When an object is sandwiched under the pallet 30 when the pallet 30 descends, the lowering of the pallet 30 is restricted, and both chains 51
Since both 51 are loosened, the pair of chains 51, 51 are respectively displaced rearward by the biasing members 72, 72 at the portion where the biasing detection mechanism 70 is provided. In each case, when each chain 51, 51 is displaced, the urging members 72, 72 and the arms 73, 73 are displaced with respect to the column 10, and the detection switches 77, 77 detect this.

Therefore, also in the above embodiment, it is detected that either one of the pair of chains 51, 51 is loose or both are loose, and one of the chains 51, 51 is detected. It is possible to detect both a cut and an object sandwiched under the pallet 30.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a two-stage parking device according to a first embodiment of the present invention.

FIG. 2 is a front view showing a state in which a cover of a support portion in FIG. 1 is removed.

FIG. 3 is a schematic view of the lifting device of FIG. 2;

FIG. 4 is a front view showing details of an upper portion of the lifting device of FIG. 2;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

6 (a) is a front view showing details of the urging detection mechanism of FIGS. 4 and 5 in a normal operation of the two-stage parking device, and FIG. 6 (b) is a plan view of the urging detecting mechanism. is there.

FIG. 7A is a front view showing details of the urging detection mechanism of FIGS. 4 and 5 in a state where one chain of the two-stage parking device is broken, and FIG. FIG.

FIG. 8 is a front view showing details of an upper part of a lifting device of a two-stage parking device according to a second embodiment of the present invention.

9 is a sectional view taken along line 9-9 in FIG. 8;

FIG. 10 is a partial cutaway view showing details of the biasing detection mechanism of FIGS. 8 and 9 in a state where one chain of the two-stage parking device is broken.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Support part, 20 ... Lifting member, 30 ... Pallet, 40
... Elevating device, 41 ... Sprocket, 46 ... Motor, 51
... Chains, 60, 70 ... Urging detection mechanism, 61, 71 ...
Brackets, 62, 72: biasing members, 63, 76: coil springs, 64, 77: detection switches, G: base surface, W: weights.

Claims (4)

[Claims] 1. A strut standing upright on a base surface, a pair of sprockets supported coaxially rotatably on the strut and rotating simultaneously, and an intermediate portion wound around each of the pair of sprockets. A pair of chains connected to the pallet at one end side, wherein the two-stage parking device is configured to rotate the pair of sprockets by a motor to move the pallet up and down; To detect that one of the pair of chains has become loose and that both of the pair of chains have become loose by detecting that the pair of chains have approached each other. A two-stage parking device provided with an urging detection mechanism. 2. The two-stage parking device according to claim 1, wherein said urging detecting mechanism comprises: a bracket fixed to only one of said pair of chains; An urging member that is pressed against the other of the pair of chains by a spring interposed between the bracket and the bracket; a detection switch fixed to the bracket to detect displacement of the urging member with respect to the bracket; A two-stage parking device, comprising: detecting that the pair of chains have approached each other by detecting displacement of the urging member by the detection switch. 3. A strut standing upright on a base surface, a pair of sprockets supported coaxially rotatably on the strut and rotating simultaneously, and an intermediate part wound around each of the pair of sprockets. A two-stage parking device, comprising a pair of chains connected to a pallet at one end side, wherein the pair of sprockets are driven to rotate by a motor so as to raise and lower the pallet. A two-stage parking device provided with an urging detection mechanism for urging the chain to detect each of the slacks of the pair of chains. 4. The two-stage parking device according to claim 3, wherein the urging detection mechanism is displaceably mounted on the support post and pressed against the pair of chains by a pair of springs. A pair of urging members for elastically urging the pair of chains, and a pair of detection switches fixed to the support portion and detecting displacement of the pair of urging members with respect to the support portion, respectively. A two-stage parking device, wherein each of the pair of urging members is respectively detected by the pair of detection switches to detect the slack of the pair of chains.