JP4543412B2 - Vehicle lift fall prevention device - Google Patents

Description

  The present invention relates to a vehicle maintenance lift that elevates and lowers a vehicle in a vertical direction, for example, and more particularly to a fall prevention device including a rack and an engaging member that prevent the lift from dropping.

  Conventionally, such a lift for vehicle maintenance includes, for example, as shown in FIG. 11, a transporter 2 on which a vehicle is mounted, a support portion 3 that supports the transporter 2, and a fall prevention device 4.

  Here, the support part 3 is comprised from the support | pillar 3b supported so that it could move to an up-down direction with respect to the base part 3a fixed below the floor surface, and this support | pillar 3b is driven by the drive mechanism which is not shown in figure. It is designed to move up and down.

  As shown in detail in FIG. 12, the fall prevention device 4 includes a rack 5 provided on the base portion 3a side of the support portion 3, an engagement member 6 provided on the support column 3b side, a release cylinder 7, It is composed of

  The rack 5 further extends in the entire moving range of the engaging member 6 along with the vertical movement of the column 3b so as to extend linearly along the moving direction of the column 3b which is the movable member of the support unit 3, that is, in the vertical direction. It is arranged over.

  On the other hand, the engaging member 6 is supported so as to be swingable around a swinging shaft 6a extending laterally with respect to the rack 5, and is slightly lower on the rack 5 side than the swinging shaft 6a. An engaging claw 6b that protrudes outward, an arm portion 6c that extends to the opposite side of the engaging claw 6b, a tension spring 6d that biases the arm portion 6c downward, and a downward movement of the arm portion 6c And a stopper 6e for restricting the pressure.

  The engaging claws 6b engage between the teeth of the opposing racks 5 when the engaging member 6 swings around the swing shaft 6a due to the tension of the tension spring 6d. At that time, the engaging claw 6b is inserted between the teeth of the rack 5 by, for example, about 5 ± 2 mm so that the arm portion 6c contacts the stopper 6e and does not reach the bottom portion between the teeth of the rack 5. It is like that.

  The tension spring 6d pushes the engaging claw 6b between the teeth of the rack 5 by urging the arm portion 6c downward. When the support column 3b of the support part 3 moves upward, the engaging claw 6b is pushed relatively downward by the tips of the teeth of the rack 5, and the engagement member 6 swings and the support column 3b moves upward. The biasing force of the spring 6d is selected so as to allow

  The stopper 6e is configured as a rubber stopper, and by restricting the downward movement of the arm portion 6c of the engaging member 6, when the column 3b of the support portion 3 receives a downward load, the stopper 6e It opposes the moment which acts on the arm part 6c via the engaging claw 6b from the teeth.

  When the release cylinder 7 lowers the transporter 2, the movable portion 7 a moves upward to push up the arm portion 6 c of the engagement member 6, and the engagement claw 6 b is moved to the teeth of the rack 5. Retracted from between, the support column 3 and the carrier 2 are allowed to descend.

  According to the vehicle lift 1 having such a configuration, when the column 3b of the support portion 3 is lifted, as shown in FIG. 13, the engagement claw 6b of the engagement member 6 is moved to the rack 5 as the column 3b is lifted. The teeth are pushed downward relatively against the tension of the tension spring 6 d and are retracted from the rack 5. Thereby, the support | pillar 3b and the transporter 2 of the support part 3 are raised smoothly without being blocked by the fall prevention device 4.

  Then, when the support column 3b and the carrier 2 are raised to a predetermined height, as shown in FIG. 12, the arm portion 6c of the engaging member 6 is moved downward by the tension of the tension spring 6d, thereby engaging the engagement member 6. The claw 6b fits between the teeth of the rack 5, and the arm portion 6c contacts the stopper 6e. Further, due to the load applied to the support column 3b and the carrier 2, the engaging claw 6b of the engaging member 6 abuts downward between the teeth of the rack 5, and the arm portion 6c contacts the stopper 6e. By contact, the load can be supported. At this time, the engagement claw 6b of the engagement member 6 is in contact with the lower side of the teeth of the rack 5 due to the load, so that the engagement member 6 may inadvertently swing in the release direction. Absent.

  Furthermore, when lowering the support column 3b and the carrier 2, the release cylinder 7 is operated, and the movable portion 7a pushes the arm portion 6c upward against the tension of the tension spring 6e. As a result, as shown in FIG. 13, the engaging claws 6 b of the engaging member 6 are retracted from between the teeth of the rack 5, so that the support column 3 b and the transporter 2 can be lowered.

  On the other hand, in Patent Document 1, a safety claw is provided at the lower part of the lifting body, a rack body is provided along the moving path of the lifting body, and the safety claw is engaged with the rack body, thereby lifting the lifting body. A safety device for preventing a vehicle lift from falling is disclosed.

  Patent Document 2 discloses a lift safety device in which an engaging member including an arm, a spring, and a locking claw is provided on a lifting body side, and a rack-like fall prevention plate is provided along a moving path of the lifting body. Yes.

In Patent Document 3, immediately before the engaging claw of the ratchet mechanism fully engages with the ratchet, the shock absorber provided on the engaging claw is caused to collide with the ratchet, thereby reducing the speed of the engaging claw and reducing the collision sound. There is disclosed a ratchet type closing machine.
JP 2000-119000 A JP 2001-316100 A JP 2000-043830 A

  However, in the above-described vehicle lift 1, when the support 3 and the carrier 2 are raised, when the engagement claw 6 b of the engagement member 6 rises along the rack 5, the engagement claw 6 b Insertion is made between the teeth of the rack 5 by the tension of the tension spring 6d, and each time the tip of the engaging claw 6b hits the teeth of the rack 5 as shown in FIG. 14, an impact sound is generated. Since this impact sound is a harsh and high-pitched metal sound, for example, in a quiet residential area, it is necessary to refrain from using the vehicle lift 1.

On the other hand, as shown in FIG. 15, there is a method in which a rubber silencer 6f is affixed to the tip of the engaging claw 6b. The material peels off quickly and is inferior in durability.
Further, as shown in FIG. 16, it is possible to adjust the tension of the tension spring 6d to be low by providing a compression spring 6g instead of the stopper 6e adjacent to the tension spring 6d. It will occur and the noise reduction effect is low.

  Furthermore, in the normal case, as shown in FIG. 17A, the arm portion 6c abuts against the stopper 6e. However, if the transporter 2 is inadvertently lowered for some reason, the arm portion 6c is changed to FIG. As shown in the figure, the engaging claw 6b tries to rotate in the direction of arrow B, but the engaging claw 6b cannot rotate so much and swings by a predetermined angle because the distance between the engaging claw 6b and the rack 5 is constant. And then stop. For this reason, a load will be applied to the stopper 6e from the arm part 6c, and the stopper 6e will be crushed and deform | transformed by overload.

  Further, since the engaging claw 6b at the tip of the engaging member 6 contacts the teeth of the rack 5 at a relatively high speed, the engaging claw 6b and the rack 5 wear quickly, and the engaging member 6 and the rack 5 The exchanges had to be done relatively frequently.

  On the other hand, in the drop safety device for a vehicle lift according to Patent Document 1 or the lift safety device according to Patent Document 2, no countermeasures against such impact noise are taken.

  In addition, in the ratchet type load closing machine according to Patent Document 3, the impact speed of the engaging claw to the ratchet is reduced by collision of the buffer provided on the engaging claw with the ratchet. Since the buffer itself is small, the noise reduction effect is low, and it is difficult to use it for a heavy load such as a vehicle lift.

  In view of the above points, the present invention reduces the impact between the engaging claw and the rack during ascent, reduces the impact sound, and reduces the wear of the engaging claw and the rack, thereby preventing the vehicle lift from falling. The object is to provide a device.

  According to the present invention, in the vehicle lift including the lift and a support portion that supports the lift so as to be movable in the vertical direction, the rack is provided adjacent to the support portion and is opposed to the rack. And an engaging member that extends to the rack side from the swinging shaft, and an arm portion that extends to the opposite side of the engaging claw. And a lift for preventing the vehicle lift from falling, and a tension spring that biases the arm portion downward so that the engaging claw engages between the teeth of the rack, and a stopper that restricts swinging of the arm portion downward And the arm part of the said engaging member is provided with the oil damper in the area | region which contact | abuts the stopper.

  In the vehicle lift fall prevention device according to the present invention, preferably, the stopper of the engaging member has a rubber stopper portion at the lower stage and a plastic portion at the upper stage.

  In the vehicle lift drop prevention device according to the present invention, preferably, the plastic portion of the stopper includes a notch on the contact surface of the oil dump.

  The vehicle lift drop prevention device according to the present invention is preferably configured such that when the engaging claw of the engaging member is fitted between the teeth of the rack, the arm member of the engaging member is in contact with the plastic upper surface of the stopper. The damper contacts the stopper with a margin in the notch.

  According to the present invention, when the lift and the support part are lifted, when the engaging claw of the engaging member is disengaged from one tooth of the facing rack and moves to the next tooth, the arm part of the engaging member However, after separating from the stopper against the tension of the tension spring, the engaging claw is disengaged from the teeth of the rack and approaches the stopper by the tension of the tension spring. At that time, since the arm portion comes into contact with the stopper via the oil damper, the contact with the stopper is eased by the oil damper, and the collision speed to the stopper is reduced.

Therefore, when the engaging claw of the engaging member is fitted between the next teeth of the rack, the contact speed to the teeth is also reduced and the impact is reduced, so that the impact sound that the engaging claw hits the teeth of the rack is generated. Can be reduced. As a result, an impulsive high-pitched impact sound is reduced and a silent effect is obtained, so that the vehicle lift can be used even in a quiet residential area, for example.
Further, as described above, since the impact of the engaging claw on the rack teeth is reduced, the wear of the engaging member and the rack is also reduced, and the life of the engaging member and the rack is prolonged. , The replacement cycle becomes longer.

  When the stopper of the engaging member is made of plastic at the contact portion of the oil damper, the load applied from the oil damper is reduced by elastic deformation of the rubber portion, Since the tip of the oil damper abuts against the plastic part against the circular movement around the arm part of the engaging member and the swing axis of the oil damper, it can slide easily in the lateral direction, so the stopper by circular movement The deviation from is absorbed. Further, when a load that causes an overload is applied, the rubber stopper does not directly contact the oil damper, so that the oil damper is protected from the overload. Furthermore, since the rubber portion that is relatively easily deteriorated can be small, the replacement cost of the rubber portion is reduced.

  When the plastic part of the stopper has a notch on the contact surface of the oil damper, the volume of the plastic part is reduced by the notch, so that the material cost of the plastic part is reduced.

  When the engaging claw of the engaging member is fitted between the teeth of the rack, the oil damper contacts the stopper with a margin in the notch while the arm member of the engaging member is in contact with the plastic upper surface of the stopper. In this case, when the engaging claw of the engaging member comes into contact with the teeth on one side between the teeth of the rack, the oil damper has a margin so that the buffering force acts effectively. . Therefore, until the moment when the engaging claw comes into contact with the teeth of the rack, the contact speed of the engaging claw by the tension spring is sufficiently suppressed, and the impact sound of the engaging claw with respect to the rack teeth is reduced.

  Thus, according to the present invention, when the support portion and the lift are raised, when the engagement claw of the engagement member abuts the teeth by the tension of the tension spring between the teeth of the rack, When the arm portion abuts against the stopper via the oil damper, the swinging speed of the engaging claw is suppressed, the abutting speed of the engaging claw with respect to the rack teeth is reduced, and the contact between the engaging claw with respect to the rack teeth is reduced. Contact force and impact sound are reduced. As a result, an impulsive high-pitched impact sound is reduced and a silent effect is obtained, so that the vehicle lift can be used even in a quiet residential area, for example. Further, since the impact of the engaging claws on the rack teeth is reduced, the wear of the engaging members and the rack is also reduced, and the service life of these engaging members and the racks is increased. Reduced.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 shows the configuration of a vehicle lift incorporating an embodiment of a vehicle lift fall prevention device according to the present invention. In FIG. 1, the vehicle lift 10 includes a transporter 11 on which a vehicle is mounted, a support unit 12 that supports the transporter 11, and a fall prevention device 20.

  Here, the support part 12 is comprised from the support | pillar 14 supported so that it could move to an up-down direction with respect to the base part 13 fixed below the floor surface, and this support | pillar 14 is comprised by the drive mechanism which is not shown in figure. It is designed to move up and down.

  As shown in detail in FIG. 2, the fall prevention device 20 includes a rack 21 provided on the base portion 13 side of the support portion 12, an engagement member 22 provided on the support column 14 side, a release cylinder 23, It is composed of

  The rack 21 extends along the moving direction of the column 14 which is a movable member of the support portion 12, that is, extends in a straight line in the vertical direction, and further the entire moving range of the engagement member 22 accompanying the vertical movement of the column 14. It is arranged over.

  On the other hand, the engaging member 22 is supported so as to be swingable around a swinging shaft 22a extending laterally with respect to the rack 21, and is slightly lower on the rack 21 side than the swinging shaft 22a. An engaging claw 22b that protrudes outward, an arm portion 22c that extends on the opposite side of the engaging claw 22b, a tension spring 22d that biases the arm portion 22c downward, and a downward movement of the arm portion 22c And an oil damper 22f provided on the arm portion 22c so as to come into contact with the stopper 22e.

  The engaging claws 22b engage between the teeth of the opposing racks 21 when the engaging member 22 swings around the swing shaft 22a due to the tension of the tension spring 22d. At that time, the engaging claw 22b is inserted between the teeth of the rack 21 by, for example, about 5 ± 2 mm so that the arm portion 22c does not reach the bottom portion between the teeth of the rack 21 when the arm portion 22c contacts the stopper 22e. It is like that.

  The tension spring 22d urges the arm portion 22c downward to push the engagement claw 22b between the teeth of the rack 21 to be fitted. When the support column 14 of the support portion 12 moves upward, the engaging claw 22b is pushed relatively downward by the tips of the teeth of the rack 21, and the engagement member 22 swings and the support column 14 moves upward. The biasing force of the spring 22d is selected so as to allow the above.

  In this case, the stopper 22e has a two-stage structure as shown in FIG. 3, and has a rubber stopper portion 22g similar to the conventional one in the lower stage and a concave plastic part 22h having an open upper surface in the upper stage. . The stopper 22e restricts the downward movement of the arm portion 22c of the engaging member 22, so that when the support column 14 of the support portion 12 receives a downward load, the stopper 22e is engaged with the engaging claw from the teeth of the rack 21. It opposes the moment which acts on the arm part 22c via 22b.

  When the transporter 11 is lowered, the release cylinder 23 pushes the arm portion 22c of the engagement member 22 upward by moving the movable portion 23a upward, and moves the engagement claw 22b from between the teeth of the rack 21. By retracting, the engagement of the engagement claw 22b of the engagement member 22 with the rack 21 is released, and the support 14 and the carrier 2 are allowed to descend.

  The oil damper 22f has a known configuration and is configured to be able to be gradually shortened based on the compression force when compressed in the vertical direction. When the arm portion 22c of the engagement member 22 descends, the oil damper 22f is fitted into the cutout portion 22i opened on the upper surface of the plastic portion 22h of the stopper 22e, and comes into contact with the bottom surface thereof. Furthermore, the oil damper 22f has a margin with respect to the bottom surface of the cutout portion 22i when the arm portion 22c of the engagement member 22 is lowered and comes into contact with the upper surface of the plastic portion 22h of the stopper 22e. Yes. That is, the arm portion 22c comes into contact with the upper surface of the plastic portion 22h of the stopper 22e, so that the compression of the oil damper 22f stops with a margin.

  Here, as shown in FIG. 4, the notch 22i is moved from the state in which the engaging claw 22b is retracted from between the teeth of the rack 21, as shown in FIG. The oil damper 22f is formed so as to penetrate the plastic portion 22h along the longitudinal direction of the arm portion 22c so that the oil damper 22f can smoothly enter the notch portion 22i when inserted.

  The vehicle lift 10 according to the embodiment of the present invention is configured as described above, and when the support column 14 of the support portion 12 is raised, the engagement member 22 is engaged as the support column 14 is raised as shown in FIG. The claws 22b are pushed relatively downward by the teeth of the rack 21 against the tension of the tension spring 22d and are retracted from the rack 21. Thereby, the support | pillar 14 and the transporter 11 of the support part 12 are raised smoothly without being blocked by the fall prevention device 20.

  When the engaging claw 22b reaches the next tooth of the rack 21, or when the support 14 and the carrier 11 are raised to a predetermined height, the engaging claw 22b shown in FIG. The engagement claw 22b enters the space between the teeth of the rack 21 from the state retracted from between the teeth.

  At this time, the arm portion 22c of the engaging member 22 is lowered based on the tension of the tension spring 22d. In the middle of the lowering, as shown in FIG. 6, an oil damper 22f attached to the arm 22c is The stopper 22e enters the cutout portion 22i of the plastic portion 22h and contacts the bottom surface thereof.

  Thereafter, when the arm portion 22c further moves downward, the oil damper 22f reduces the moving speed downward, so that the swinging speed of the engaging member 22 and the moving speed of the engaging pawl 22b are reduced. . The oil damper 22f abuts on the bottom surface of the cutout portion 22i made of plastic so that it can be easily slid, so that the cutout portion 22i can be moved even if the arm 22c moves laterally around the swing shaft 22a. Can be easily slid.

  Then, as shown in FIG. 7, when the arm portion 22c of the engaging member 22 comes into contact with the upper surface of the plastic portion 22h of the stopper 22e, the swinging is stopped, and the engaging claw 22b of the engaging member 22 is The rack 21 is inserted between the teeth. At this time, since the oil damper 22f is in contact with the bottom surface of the notch 22i of the plastic portion 22h of the stopper 22e with a margin, the engagement member 22 has an arm portion 22c of the plastic portion 22h of the stopper 22 Until the contact with the upper surface, the rocking speed of the oil damper 22f continues to be reduced.

  Therefore, the contact speed when the engagement claw 22b abuts on the teeth of the rack 21 is reduced by the buffering action of the oil damper 22f, so that the impact sound generated when the engagement claw 22b abuts on the teeth of the rack 21 is reduced. Becomes smaller. Further, the contact speed of the engaging claws 22b with the teeth of the rack 21 is reduced, so that the wear of the teeth of the engaging claws 22b and the rack 21 is reduced, so that the replacement period becomes longer and the maintenance cost is also reduced. Can be done.

  FIG. 8 is a graph comparing impact sound simulations of the fall prevention device 20 in the vehicle lift 10 according to the present embodiment and the fall prevention device without an oil damper. In the graph of FIG. 8, in the range of audible frequencies, particularly in the frequency band of 3 kHz to 4 kHz where human sensitivity is good, the impact sound of the fall prevention device 20 provided with the oil damper is prevented from falling without the oil damper. It turns out that it is restrained small enough compared with an apparatus.

Furthermore, in a normal case, as shown in FIG. 9, the arm portion 22c abuts against the upper surface of the plastic portion 22h of the stopper 22e, whereby the swinging of the engaging member 22 is restricted, and the rubber stopper portion 22g. Is not very deformed.
On the other hand, when the transporter 11 is inadvertently lowered for some reason, the engaging claws 22b try to rotate in the direction of arrow C as shown in FIG. As a result, the arm 22c of the engaging member 22 is going to descend, and the arm 22c further pushes the plastic portion 22h of the stopper 22e downward.

  Accordingly, the rubber stopper portion 22g below the stopper 22e is elastically deformed so as to be compressed, and the load at the time of overload is released. At this time, since the arm portion 22c of the engaging member 22 directly contacts the upper surface of the plastic portion 22h of the stopper 22e, the load at the time of overload is not applied to the oil damper 22f, and the oil damper 22f Is protected from overload.

  In this case, since only a part of the stopper 22e is configured as the rubber stopper portion 22g, when the height of the stopper 22e is about 18 mm, for example, the height of the rubber stopper portion 22g is about 5 mm. Since the volume of the portion 22g is small, the material cost and maintenance cost of the rubber stopper portion 22g made of an elastic material that is relatively easy to deteriorate can be reduced. Further, since the plastic portion 22h of the stopper 22e is also provided with the cutout portion 22i, the amount of material used can be reduced, and the material cost can be reduced.

  The present invention can be implemented in various forms without departing from the spirit of the present invention. For example, in the embodiment described above, the stopper 22e includes the notch 22i in the upper plastic portion 22h, but the notch 22i may be omitted. In this case, the oil damper 22f comes into contact with the upper surface of the plastic portion 22h of the stopper 22e. In the above-described embodiment, the stopper 22e has a two-stage configuration, but it is obvious that the whole may be made of rubber as in the conventional case.

It is the schematic which shows the structure of the vehicle lift incorporating one Embodiment of the fall prevention apparatus by this invention. It is the elements on larger scale which show the structure of the fall prevention apparatus in the vehicle lift of FIG. It is an expansion perspective view which shows the stopper in the fall prevention apparatus of FIG. It is the schematic which shows the state at the time of the rocking | fluctuation of the engaging member of the fall prevention apparatus of FIG. 2A and 2B show a moment when the engaging claws are disengaged when the fall prevention device of FIG. 2 is raised, FIG. 2A is a schematic side view, and FIG. FIGS. 2A and 2B show a state where the engaging claws enter between the teeth of the rack when the fall prevention device of FIG. 2 is raised, and FIG. 2A is a schematic side view, and FIG. The moment when an engaging claw contacts the teeth of a rack when the fall prevention device of FIG. 2 is raised is shown, (A) is a schematic side view, and (B) is a schematic rear view. It is a graph which shows the comparison of the impact sound of the fall prevention apparatus of FIG. 2, and the fall prevention apparatus without an oil damper. The engagement member at the normal time of the fall prevention apparatus of FIG. 2 is shown, (A) is a schematic side view, (B) is a schematic rear view. The engagement member at the time of the overload of the fall prevention apparatus of FIG. 2 is shown, (A) is a schematic side view, (B) is a schematic rear view. It is a schematic sectional drawing which shows the structure of an example of the vehicle lift provided with the conventional fall prevention apparatus. It is the elements on larger scale which show the structure of the fall prevention apparatus in the vehicle lift of FIG. It is the schematic which shows the moment when an engagement nail | claw remove | deviates at the time of the fall prevention apparatus of FIG. It is the schematic which shows the moment when an engaging claw contact | abuts the tooth | gear of a rack at the time of the raise of the fall prevention apparatus of FIG. It is a side view which shows the modification of the engaging member in the fall prevention apparatus of FIG. It is the schematic which shows the other modification of the fall prevention apparatus of FIG. In the fall prevention device of FIG. 12, (A) is a schematic view showing a normal state, and (B) is a schematic view showing an overload state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle lift 11 Carrier 12 Support part 13 Base part 14 Support | pillar 20 Fall prevention device 21 Rack 22 Engagement member 22a Oscillating shaft 22b Engagement claw 22c Arm part 22d Tension spring 22e Stopper 22f Oil damper 22g Rubber stopper part 22h Plastic part 22i Notch 23 Release cylinder

Claims (4)

In a vehicle lift comprising a lift and a support portion that supports the lift so as to be movable in the vertical direction, a rack provided adjacent to the support portion, and swings on the support portion so as to face the rack An engaging member that engages with the rack, the engaging member extending to the rack side from the swing shaft, an arm portion extending to the opposite side of the engaging claw, and A vehicle lift including a tension spring that biases the arm portion downward so that the engaging claw engages between the teeth of the rack, and a stopper that restricts swinging of the arm portion downward. A fall prevention device,
An apparatus for preventing a vehicle lift from dropping, wherein the arm portion of the engagement member includes an oil damper in a region where the arm portion abuts against the stopper.   2. The vehicle lift drop prevention device according to claim 1, wherein the stopper of the engaging member has a rubber stopper portion at a lower stage and a plastic portion at an upper stage.   The vehicle lift drop prevention device according to claim 1 or 2, wherein the plastic portion of the stopper includes a notch in the contact surface of the oil damper.   When the engaging claw of the engaging member is fitted between the teeth of the rack, the oil damper has a margin in the notch with the arm member of the engaging member in contact with the plastic upper surface of the stopper. The vehicle lift drop prevention device according to claim 3, wherein the vehicle lift drop prevention device is in contact with the stopper.

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