JPH0714320Y2 - Safety equipment for vehicle maintenance lifts - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to a rack mounted on a column and a locking claw mounted on a carriage when the suspension is cut or the hydraulic pressure is lowered. It is related to the safety device of the maintenance lift that automatically prevents the carriage from falling by locking.
(EN) Provided is a safety device for a maintenance lift which has a simple structure and a simple structure and is excellent in operability and reliability.

(B) Conventional technology Conventionally, unexpected situations such as chain breakage,
If the hydraulic pressure suddenly drops, the safety device for the maintenance lift that responds to it and prevents the fall of the carriage is
Many have been published, including 54-90872 and JP-B-58-48479. However, the former is a structure in which the safety device is activated at the same time as cutting the suspension body (chain) by using the electrical detection means, so that there is a risk of malfunction due to a failure of the electrical system and the entire device becomes expensive. Had the drawbacks. On the other hand, in the latter, in the normal state, the spring is constrained in a compressed state by the load of the carriage, and when the suspension body is cut, the spring restraint is immediately released so that the lock mechanism of the carriage operates. By using mechanical means, various problems caused by the former electric means are overcome.

In the invention described in the microfilm of Japanese Utility Model Application No. 50-87413 (Japanese Utility Model Application No. 52-2765), the guide wheel and the arm body that come into contact with the operating wire are located at the same position on the rotation axis of the weight. When the operation wire is cut off, the guide wheel and the arm rock on the same orbit, and the tip of the arm keeps the space of the cut and dropped operation wire. After passing, the carriage is prevented from falling by engaging with the receiving member located on the opposite side.

(C) Problems to be solved by the invention The safety device for the maintenance lift, which is constructed entirely by mechanical means without using electrical means, greatly reduces reliability by halving the factors that cause malfunctions. did. However, that structure is premised on the cutting of the hanging body, and when the hanging body is cut, the push rod first projects downward to rotate the lever, and then the lock shaft engaged with the lever. Due to the extremely complicated structure in which the pawl integrated with the lock shaft is allowed to enter into the engagement hole, the probability of malfunctioning is extremely high even if sufficient maintenance is performed. Moreover, its maintenance requires advanced adjustment technology,
Handling was also troublesome.

D. Means for solving the problem The present invention provides a safety device having good operability and reliability with a simple structure, without using any electric means, all using mechanical means. The structure is such that a suspended carriage can be moved up and down along a pillar, and the carriage mounted by the locking action of the rack mounted along the pillar and the locking claws mounted on the carriage. Is a maintenance lift for preventing the falling of the locking claw, the locking claw being biased in the locking direction by a spring member, and the locking claw fixed coaxially with the claw, and the tip end surface being attached to a suspension body or contact. A safety device for a vehicle maintenance lift, comprising: a pressing member that comes into pressure contact with a child, the pressing member having elasticity, and fixing a turning lever coaxially with a locking pawl thereof.

E action By rotating the locking claw that is fixed coaxially using the rotation lever in the direction of locking the rack, the elastic pressing member contracts even if the suspension is not cut. The carriage can be locked to the rack at any height. Further, when the turning lever is turned in the opposite direction, the locking claw is disengaged, and the locking claw is kept disengaged by the pressing member that presses the suspension body, so that the lift can be lowered. Then, if the tension is lost due to the suspension body breaking or the hydraulic pressure drops and the suspension body that does not break loosens when the locking claws are removed, the pressure contact action of the pressing member also disappears. The locking claws are locked to the rack by the urging force of the spring member, and the fall of the carriage is prevented.

F. Embodiments The drawings show a safety device according to the present invention. First, an outline of the lift structure will be described. In FIG.
Is a pillar vertically installed in parallel with each other at a predetermined interval, a hydraulic cylinder 2 is provided in one pillar 1, and supporting pillars 3 and 3'are provided on the pillars 1 and 1 ', respectively.
It is provided horizontally and with its tips facing each other. A freely rotatable sprocket 4 is attached to the tip of the piston rod 2a of the cylinder 2, and is fixed to the lower end of a column 1 on the right side of the drawing and the lower and upper ends of a column 1'on the left side of the figure, which is equipped with the cylinder. Sprockets 4a, 4b,
4c are deployed respectively. Reference numeral 5 is a chain for suspending the carriages 3 and 3 ', and the chain 5 is
One end is fixed to an appropriate portion of the column 1 below the lowermost position of the sprocket 4 attached to the tip of the piston rod 2a, and is folded back over the sprocket 4 and tensioned in the middle of the end of the carriage 3 The fixed sprocket 4a and 4b in this order through the guide sprocket 4d, and then folded back over the fixed sprocket 4c to connect the other end to the base end of the other carriage 3 '. Both carriages 3 and 3'are provided with sliding bodies 3a and 3'a on the base end side, and each sliding body 3a, 3'a
Are guided by guide rollers attached to the upper and lower sides, respectively, and can be moved up and down in the columns 1, 1 ', and pedestals 6, 6 are provided at the tips of the carriages 3, 3'. .

When the piston rod 2a is moved up and down by the operation of the hydraulic cylinder 2, the sprocket 4 attached to the tip of the piston 2 moves up and down, and the carriages 3 and 3'can be smoothly moved up and down along the columns 1 and 1 '. it can. The main part of the safety mechanism 7 is provided at the center of the carriage 3, and
Racks 8 are attached to both sides of the sliding body 3a on the protruding side of the carriage 3 along the columns.

Further, the chain 5 corresponding to the mounting height position of the safety mechanism 7 in the carriage 3 is provided with two screw bolts between the connecting pins 5b for connecting the link plate 5a to the washer 1.
The heads of the screw-in bolts are projected to the side of the chain as the contacts 9, 9 by penetrating through 0 and 10 and fixing the tips with nuts 12 and 12 via washers 11 and 11.

A rotation support shaft 13a of the locking claw 13 is horizontally provided obliquely above the contactor 9, and the rotation support shaft 13a has a U-shaped cross section and an intermediate portion 14b formed to be bendable. The pressing spring plate 14 is integrally connected to the pressing spring plate support body 15 via the spacers 16 by the washers 17, 17 and the hexagon socket head cap bolts 18, 18, and at both outer ends of the rotary support shaft 13a. Locking pawls 13 and 13 which are locked to the racks 8 and 8 are integrally attached, and further, cutout grooves 19 and 19 provided at both upper end portions of the pressing spring plate support 15 and a safety mechanism 7 are provided. Coil springs 20, 20 are stretched between the carriage 3 and the base portion, and the pulling force of the coil springs 20, 20 causes the tip surface 14a of the pressing spring plate 14 to extend.
Is pressed against the contacts 9 and 9 and rotational force is applied to the locking claws 13 in the locking direction with the racks 8.

A rotation lever is fixed to one end of the rotation support shaft 13a,
Pressing spring plate when turning the turning lever manually
Since the intermediate portion 14b of 14 is bent and the locking claw 13 engages with the rack 8, the fall prevention function becomes operable.

It should be noted that this rotational force, together with the elastic force of the pressing spring plate 14 in the normal state, always ensures that the tip end surface 14a of the pressing spring plate 14 is pressed against the contacts 9, 9 of the chain 5.

An opening / closing lid 21 is provided on the front side of the safety mechanism 7 on the vehicle supporting side, and a stopper rubber 22 is stretched over the surface of the lid 21 to protect the vehicle door supported by the cradle 6. Has become.

The safety device for the vehicle maintenance lift configured in this way is
In the normal state, the locking claw 13 and the rack 8 are kept in the unlocked state, and the tip end surface 14a of the pressing spring plate 14 is in pressure contact with the contacts 9 and 9. When the chain 5 is not cut and the tension is weakened, the contacts 9 and 9 are disengaged from the tip end surface 14a of the pressing spring plate 14 and the rotary support shaft 13a is rotated to the coil springs 20 and 20.
Is rotated to the locking side by the force of the
The carriages 3 and 3'are prevented from falling by being locked to the carriage 8.

Regarding the specific structure of pressing the tip end surface 14a of the pressing member 14 against the hanging body 5, the contactor 9 projecting from the hanging body 5 and the tip end surface 14a of the locking claw 13 are racked. 8 is in contact with the head of the contactor 9 when it is disengaged from the contact 8, and when the locking claw 13 is locked to the rack 8, the locking claw 13 is positioned to the side of the contactor 9. Like the pressing member 14 fixed to the rotary support shaft 13a, the tip surface 14a is attached to the hanging body 5,
It may be configured to indirectly press-contact via the contactor 9. As a result, when the chain is not cut, when the rotation lever is rotated and the locking claw 13 shown by the dotted line in FIG. 5 locks on the rack 8 to activate the lowering prevention function, the pressing member is pressed. After the tip surface 14a of 14 has slid upward from the head of the contactor 9, as shown by the solid line in FIG.
Since 14b is not bent, the locking claw 13 is not urged in the direction of being released from the rack 8 and thus the engagement state is stable.

Further, regarding the specific configuration of the pressing member 14, the locking claw 13
When the locking claw 13 is disengaged from the rack 8, the tip surface 14a directly abuts on the hanging body 5, and when the locking claw 13 is locked to the rack 8, the locking claw 13 is bent so that the intermediate portion 14b is bent. It can be configured as a pressing member 14 fixed to the rotation support shaft 13a. As a result, the contactor 9 as described above is not necessary, and the locking claw 13 is used when the chain is not cut.
Is locked to the rack 8, the pressing member 14 is bent to urge the locking claw 13 in a direction to release it from the rack 8 with a force smaller than the urging force of the spring member 20. The effect that a state where it is easy to obtain is obtained.

On the other hand, on the left side of the carriage 3 ′, as shown in FIG. 4, a locking body 23 having a rotatable and vertical insertion hole 23 a is attached to the carriage 3 and is attached to the locking body 23 at the tip thereof. The base end of the locking arm 24 having the locking pin 24a projecting toward it is fixed, and the turning force is applied by the coil spring 24b, and the support pole 25 erected inside the column 1'is fixed. Insertion hole
23a is loosely inserted and the locking pin 24a is locked to the chain 5, so that the portion of the chain 5 stretched between the carriages 3 and 3'is cut off, so that the left carriage 3 '
Shows that the locking pin 24a is disengaged from the chain 5 and the locking body 23 rotates, so that the central axis of the insertion hole 23a and the support pole 25 intersect with each other, and the locking body 23 is secured in the middle of the support pole 25. Is fixed. At this time, the safety mechanism of the carriage 3 on the right side does not operate, but there is no concern because it is suspended by the chain. If the chain 5 that suspends the right carriage 3 is cut off, both the left and right safety mechanisms operate simultaneously.

In the safety device for the maintenance lift of the above-mentioned embodiment, the spring plate whose intermediate portion is bendable is used as the pressing member, but any other member may be used as long as it has elasticity. Even when the suspension body is strained by the load of the vehicle and the suspension body is not bent in the horizontal direction or the biasing direction of the spring member, the engagement claw can be locked to the rack. Further, when the suspension body bends in the horizontal direction or the like, the pressing member may be a plate or rod of ordinary metal or synthetic resin, which is not bent. In other words, if the pressing member indirectly presses the hanger in the horizontal direction or the like by the turning lever, the hanger is flexed in the horizontal direction or the like via the contact, and the pressing member comes off from the head of the contact. The locking claw can be rotated. Similarly, if the pressing member directly presses the hanger in the horizontal direction or the like by the turning lever, the hanger can be bent in the horizontal direction and the locking claw can be rotated. The hanging body may be a wire rope or the like other than the chain.

Although the left-side carriage 3'has different safety mechanisms, the same safety mechanism can be provided, or both safety mechanisms can be interlocked for a more complete operation.

The effect of the safety device for a vehicle maintenance lift according to the present invention is that when the locking claw is not locked, in addition to the case where the conventional suspension body is cut, the hydraulic pressure drops sharply. Even if the suspension member that has not been bent is bent, the locking claws immediately enter the locking body and the carriage is prevented from falling. Also,
When the lift is raised, it is possible to lock the carriage at an arbitrary position by engaging the locking claw with the rack using the rotation lever. It has a reasonable and simple structure, is easy to operate, has few failures, and is highly reliable, which is a great advantage for vehicle maintenance.

Further, in the embodiment, the pressing member is configured to be indirectly pressure-contacted to the hanging body through the contact, and even when the locking claw is engaged with the rack, for example, An effect is obtained in that the pressing member does not contract due to pressure contact and does not give a biasing force in a releasing direction.

[Brief description of drawings]

The drawings show a safety device for a maintenance lift according to the present invention. Fig. 1 is a front view showing an embodiment of the safety device for a maintenance lift, and Fig. 2 is an exploded perspective view of the main part of this embodiment. , Third
FIG. 4 is a side view thereof, FIG. 4 is a perspective view of a safety device provided on the other carriage, and FIG. 5 is an explanatory view when the locking claws are engaged with the rack when the suspension body is not cut. Is. 1, 1 '... Strut, 2 ... Hydraulic cylinder, 2a ... Piston rod, 3 3' ... Carriage, 3a, 3'a ... Sliding body, 4 ... Sprocket, 4a, 4b, 4c ... Fixed sprocket, 4d …… Guide sprocket, 5 …… Chain,
5a ... Link plate, 5b ... Connecting pin, 6 ... Vehicle cradle, 7 ... Main part of safety mechanism, 8 ... Rack, 9 ...
… Contacts, 13 …… Locking claws, 13a …… Rotating spindles, 14 …… Pressing spring plates, 14a …… Pressing spring plate tip surfaces, 15 …… Pressing spring plate supports, 16, 16 …… Spacers , 19, 19 ... Notch groove, 20, 20 ... Coil spring, 21 ... Lid, 22 ......
Stopper rubber, 23 …… Locking body, 23a …… Insertion hole, 24 ……
Locking arm, 24a ... Locking pin, 24b ... Coil spring,
25 …… Support pole

Claims (1)

[Scope of utility model registration request] 1. A rack, which is capable of moving a suspended carriage up and down along a column, and is attached along the column,
In a maintenance lift that prevents the carriage from falling by a locking action with a locking claw attached to a carriage, a locking claw (13) that is biased by a spring member (20) in a locking direction, The pressing member (14) is provided coaxially with the locking claw (13) and has a pressing member (14) for pressing the tip end surface (14a) to the hanging body (5) or the contactor (9). ) Has elasticity, and the rotation lever is attached to its locking claw (1
Safety device for maintenance lifts, which is fixed coaxially with 3).