JPH0328079Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application The present invention is equipped with a pair of upright pillars each having a carriage that moves up and down in synchrony with each other, and a rack-like engagement provided vertically on the side of each pillar. An automobile maintenance lift in which a stop part and a locking pawl that horizontally rotates integrally with a rotary rod that moves up and down together with each of the carriages engage with the stop part to prevent the carriage from descending. Regarding safety equipment.

B. Prior Art When a carriage is used to lift a car to a predetermined height and the carriage is held at that position, some kind of locking mechanism is required from the standpoint of safety. As a typical mechanism, the carriage and the support are fixed by engaging the locking pawl and the locking step, thereby preventing the carriage from being inadvertently lowered. The locking pawl and the locking stepped portion are engaged by rotating the locking pawl around the horizontal axis, and this is done simultaneously on both supports. This may not be possible smoothly, and there is a risk that the lock may not be locked even if the lock lever is operated. If you continue to work without it being locked, there is a high risk that the carriage will not be able to withstand the weight of the car and the wires will break. Furthermore, although the carriages are designed to always move up and down in synchronization, if an abnormality occurs in the synchronization mechanism and a difference in height occurs between the two carriages,
There is a risk that the support of the car will become unstable and the car will fall. Therefore, in the past, for example, Japanese Patent Application Laid-Open No. 53-1999
A lift device described in Publication No. 38018 is known.

C. Problems to be Solved by the Invention In the conventional lift device, the safety mechanism does not operate if the wire rope breaks. Also, when the carriage is raised, the height of the vehicle varies depending on the car, so for example, the height of the roof of a sports car and a high-roof wagon are naturally different even if the carriage is the same height. . Therefore, it is necessary to check the highest position of the carriage depending on the car, but if you accidentally raise the carriage too high, the roof of the car will break through the ceiling of the repair shop, or if it is a gate-type lift, the cross beam will be damaged. Accidents that could damage the roof of a car are expected. The above unforeseen situations can be prevented by checking each operation each time so as to always remain vigilant, or by installing a detection mechanism in each part and taking warning or security measures. It is impossible to hope for everyone to be completely aware of this, and it would be expensive to set up special security mechanisms.

D. Means for Solving the Problems The present invention uses a set of detection mechanisms and a wire rope to detect the engagement between the locking pawl and the locking step, the raised position of the carriage, and the high bottom of the carriage. If there is an abnormality in the difference and detection mechanism itself, it is detected and appropriate measures are taken.Each rotating rod is equipped with a swinging rod whose tip moves in an arc in conjunction with the rotation of the rotating rod. A wire rope is strung horizontally across the upper part of the pillars between the pillars, one end of the wire rope is hung down and fixed to one swinging rod, and the other end is hung down and folded back at the bottom of the pillar to attach to the other swinging rod. A fixed tension is applied to the wire rope by applying a rotational force to at least one of the rotating rods in the direction of pulling the wire rope, and the proximal end is pivoted to an appropriate part of the support, and the tip is A pulley and a dogleg-shaped contact plate are provided at the tip of a swinging arm that moves in an arc shape, and the wire rope is tensioned on the pulley, and the dogleg-shaped inner surface of the dogleg-shaped contact plate The contact plate of the detection mechanism is provided with a contact point of a limit switch, and is formed so that both sides of the contact plate can come into contact with the contact point of the limit switch by displacement of the tip of the swinging arm, and the contact plate is brought into balance with the tension of the wire rope. The limit switch is arranged so that the operation of the limit switch and the safety mechanism can be linked.

E. Effect If both carriages are perfectly synchronized, the tension of the wire rope will not change, but if there is even a slight height difference between them, the wire rope breaks, or the roof of the car touches the wire rope. When it comes into contact with an exposed part, the tension in the wire rope changes, activating the limit switch and activating the safety mechanism.

F. Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows an example in which the safety device of the present invention is incorporated into a general gate-type lift.The structure of the gate-type lift can be briefly explained by two upright columns 1 and 1'. are connected to each other by horizontally suspending a cross beam 2 at the upper end, and each column 1, 1' is connected by a cylinder 3 fixed laterally within the cross beam 2.
a carriage 4 that can be raised and lowered via a chain 3';
4' is provided. Rotating rods 5, 5' are horizontally attached to the bracket parts 4a, 4'a of the carriages 4, 4', and the rotating rod 5 of the rotating rods 5, 5' is rotated by an operating rod 5a. Then, the locking pawl 6 rotates integrally with the rotary rod 5, and can be engaged with or disengaged from a locking step 7 provided opposite to the side surface of the support column 1. A swinging rod 8 is provided on the rotating rod 5 to project in a direction perpendicular to the axial direction, and the tip of the swinging rod 8 moves in an arc shape as the rod rotates.

A wire rope 9 is stretched exposed parallel to the cross beam between the two supports 1 and 1' at a position slightly lower than the cross beam, and one end of the wire rope 9 is connected with a detection mechanism 10 interposed in the middle. It hangs down inside the support column 1, and its tip is connected to the tip of the swinging rod 8. As shown in the third figure, the detection mechanism 10 includes a swinging arm 11 whose base end is pivoted and whose distal end moves upward and downward in an arc shape, and the distal end side of the swing arm 11 is suspended by a coil spring 12. A pulley 13 and a dogleg-shaped abutment plate 14 are attached to the tip of the pulley 11, and the wire rope 9 is hung on the pulley 13 so as to be tensioned by the tension of the coil spring 12. The limit switch 15 is provided so that the contact point is located inside the dogleg shape of the contact plate 14, and when the swing arm 11 moves, the limit switch 15 is activated even if either the upper or lower end of the contact plate 14 comes into contact with the contact point. It's becoming like that. The other end of the wire rope 9 hangs down inside the support 1' to the lower end, and is folded back at the lower end via a pulley 16 to connect the tip to the swinging rod 8'. Coil springs 17 and 17' are attached to the outer peripheries of the rotating rods 5 and 5', respectively, and a rotational force always acts on the rotating rod 8 in the direction of pulling the wire rope 9. A certain tension is applied to it. In order to apply a constant tension to the wire rope, it is not necessarily necessary to apply rotational force to both rotating rods, but it is possible to apply rotational force to only one side by regulating the rotation range of one of the rotating rods. In the drawings, reference numerals 18, 18, . . . indicate guide pulleys arranged so that the wire rope 9 moves smoothly and stably. The wire rope stretched in this manner is maintained at a constant tension and the swing arm does not move if the carriage moves up and down in synchronization. In the automobile maintenance lift of this embodiment, when the carriage is raised to a predetermined height, the locking pawl is engaged with the locking step by operating the operating lever to lock the carriage. In this locking operation, the left and right pillars 1, 1'
When the operating rod 5a is rotated clockwise in FIG. Since it rotates in the direction, the connecting force between the wire rope 9 and the swinging rod 8', which rotates in conjunction with the other latching claw 6', is loosened. Therefore, the rotating rod 5' is rotated counterclockwise by the force of the coil spring 17', and the locking pawl 6' engages with the locking step 7'.
If the locking pawl 6 on the side where the operating rod is attached does not engage with the locking step 7, it is impossible to rotate the operating rod, so the poor engagement can be immediately detected, and the other locking pawl 6' does not engage with the locking step 7. If it does not engage with part 7', rotating the operating rod will loosen the wire rope, and the tip of the swinging arm will be pulled upward by the coil spring suspending the swinging arm, thereby causing it to move downward. It can be confirmed that the side contact plate contacts the contact point of the limit switch and that the locking pawl is not engaged with the locking step. Also, when the carriages are moved up and down, if both carriages are perfectly synchronized, the tension of the wire rope will not change, but if there is even a slight difference in height between the two, the tension of the wire rope will change and the limit switch will be activated. work. Furthermore, since the wire rope is strung exposed above between the supports, when a car is placed on a carriage and the carriage is raised, if the roof of the car comes into contact with the exposed part of the rope, the wire rope will be suspended. As the tension increases, the tip of the swinging arm lowers and the upper side of the abutment plate comes into contact with the contact point of the limit switch, which activates the limit switch. Also, if the wire rope breaks,
The tip of the swinging arm is pulled up by a coil spring, which activates the limit switch, so it is possible to detect when the wire rope is broken. In other words, it is also useful for identifying abnormalities in the safety device itself.

Therefore, if the limit switch is activated, security mechanisms and hazard prevention measures should be implemented, such as turning off the power and stopping all lift operations, or activating lock mechanisms on all moving parts at that point. Therefore, if the carriage is not completely locked or the carriage is not synchronized accurately, it can be immediately detected and safety can be ensured. Also, if the car is lifted too high, it can be detected and damage to the car can be prevented.

The safety device for the automobile maintenance lift of this embodiment is incorporated into a gate-type lift, but it can also be incorporated into a two-post lift or a four-post lift. Furthermore, the detection mechanism is not limited to the one in this embodiment, and as long as it is capable of detecting changes in the tension of the wire rope, its mounting position, structure, etc. are not critical, and the operating rod may be mounted on any rotating rod. Alternatively, it can be attached in the middle of the wire rope.

Note that the wire rope can be changed to a chain, piano wire, etc., and the application of tension to the wire rope is not limited to a coil spring.

Effects As described above, the present invention can confirm the engagement between the locking pawl and the locking step, detect the difference in height of the carriage, and check the highest ascending position by passing a single wire rope. Since three types of safety confirmation are possible, the safety is extremely high with a simple structure, and its effectiveness is tremendous.

[Brief explanation of drawings]

Fig. 1 is an explanatory view of the main parts of an embodiment in which the safety device of the present invention is incorporated into a gate-type lift, Fig. 2a is a perspective view showing the engaging part between the locking pawl and the locking step, and Fig. 2 Fig. b is a perspective view showing a connected state of the locking pawl and the wire rope on the other support, and Fig. 3 is a perspective view showing the detection section. 1, 1'... Support, 2... Cross beam, 3... Cylinder, 3'... Chain, 4, 4'... Carriage, 4
a, 4'a... Bracket, 5, 5'... Rotating rod, 5a... Operating rod, 6, 6'... Locking claw, 7,
7'... Locking step, 8, 8'... Swinging rod, 9... Wire rope, 10... Detection mechanism, 11... Swinging arm, 12... Coil spring, 13... Pulley, 14 ... Contact plate, 15 ... Limit switch, 16 ... Pulley, 17, 17' ... Coil spring, 18 ... Guide pulley.

Claims (1)

[Claims for Utility Model Registration] 1. A pair of pillars each having a carriage that moves up and down in synchrony with each other, and a rack-shaped locking step provided in the vertical direction on the side surface of each support, and a carriage that moves up and down together with each of the carriages. In an automobile maintenance lift in which a locking pawl that horizontally rotates integrally with the rotary rod engages with the locking step to prevent the carriage from descending, each of the rotary rods is provided with a locking pawl that rotates horizontally in unison with the rotary rod. A swinging rod whose tip moves in an arc shape in conjunction with the rotation is provided, a wire rope is strung horizontally over the top of the pillars between the pillars, one end of the wire rope is hung down and fixed to one of the swinging rods, The other end is hung down, folded back at the bottom of the support column, and fixed to the other swinging rod, and a rotational force is applied to at least one of the rotating rods in the direction of pulling the wire rope to maintain a constant tension on the wire rope. granted,
A pulley and a dogleg-shaped abutment plate are provided at the tip of a swinging arm whose base end is pivotally supported at an appropriate part of the column and whose tip moves in an arc shape, and the wire rope is tensioned on the pulley, and The above-mentioned detection mechanism has a limit switch contact on the dogleg-shaped inner surface of a dogleg-shaped abutment plate, and both sides of the abutment plate can come into contact with the limit switch contact by displacement of the tip of the swinging arm. 1. A safety device for an automobile maintenance lift, characterized in that an abutment plate is arranged in balance with the tension of a wire rope so that the operation of the limit switch and a safety mechanism can be linked. 2. The safety device for an automobile maintenance lift according to claim 1, wherein the automobile maintenance lift is a gate-type lift in which a beam is horizontally suspended and connected to the upper ends of both supports.