JPH0630794Y2 - Elevator safety device - Google Patents

Description

[Detailed Description of the Invention] (a) Field of industrial use In the present invention, a pair of X-shaped parallel expansion / contraction mechanisms are provided, each of which has a lower one end on each of the left and right sides of a base frame, which is a base, and is rotatable to the end of the base frame. It is pivotally attached to the base, and the other end of the lower part is slidably arranged along the base frame. On the upper part of the X-shaped parallel expansion / contraction mechanism, the platform is attached to the end of the back surface of the platform. The upper end of the X-shaped parallel expansion / contraction mechanism is rotatably pivoted, and the other end of the upper part of the X-shaped parallel expansion / contraction mechanism is slidably provided on the back surface of the other end, and the driving means opens / closes the X-type parallel expansion / contraction mechanism. In an elevator that raises and lowers the platform, in order to prevent the platform from falling, not only a stationary elevator that is installed on the floor but also a cargo handling elevator that has wheels attached to the base frame,
The present invention relates to a safety device provided in various types of elevators such as an embedded lift in which the platform is flush with the floor when the platform is lowered.

(B) Prior art As a safety device for the elevator, as shown in FIG. 6a, for example, a tip of a supporting rod 16 pivotally attached to a sliding side link 2a of an X-shaped parallel expansion / contraction mechanism 2 is provided along a base frame 1. When the platform 3'is lowered to a certain height, the tip of the support rod 16 abuts against the end of the base frame 1 to prevent the platform 1'from descending below that height. Alternatively, as shown in FIG. 6b, the rack 9 provided in parallel with the pivot side link 2b of the X-type parallel expansion / contraction mechanism 2 and the sliding side link 2a crossing the pivot side link 2b are pivotally attached. It is known that the engagement with the locking claws 17 locks the X-shaped parallel expansion / contraction mechanism 2 against the downward movement of the platform 3'to prevent the platform 3'from falling.

(C) Problems to be solved by the invention Among the conventional safety devices, the former one has a drawback that the safety device does not work unless the platform is lowered to a predetermined height, and the latter one raises the platform. If
When the locking claws are set in the locking posture, the locking claws successively climb over the rack as the lift is lifted, and the locking position moves in stages. Therefore, when the lift-up operation is stopped, the descent prevention function works at the locking position, and the lift-down cannot be performed unless the locking claw and the rack are once unlocked. However, when performing a lift-down operation, the former removes the support rod from the end of the base frame, and the latter releases the locking between the locking claw and the rack, but when the lift-up operation is performed again after the lift-down is completed. In both cases, the support rod or the locking claw must be reset to the locking posture before each of the lift-up operations.

Therefore, there is a high possibility that the locking mechanism will not be reset due to operator's negligence, or that resetting will be inadvertently forgotten.
It cannot be said that it is a perfect safety device, and the remote control using a cylinder operated by an electric solenoid, hydraulic pressure, or air pressure is not only complicated in structure but also costly, but it also has a problem due to improper locking. There is also a risk of the occurrence of the next trouble.

D. Means for solving the problem The present invention has a high safety because the resetting operation of the locking mechanism is automatically performed in conjunction with the lift down operation of the platform, and the locking mechanism works reliably during lift up. The structure is such that a rack member provided on the upper edge of the base frame is provided between the lower end of the X-shaped parallel expansion and contraction mechanism and the base frame, and the rack member is locked to the rack member. A locking mechanism including a locking member attached to the other lower end of the X-shaped parallel expansion / contraction mechanism is provided for operation, and a parallel crank motion is performed with respect to the rack member to push up the locking member, Is provided with a push-up bar that allows the locking mechanism to be released from the rack, and a stopper that stops the push-up bar at the lock release position where the locking member separates from the rack. , Push it In the posture in which the lifting bar releases the locking mechanism, the wheel outer circumference is provided at the lower end of the X-shaped parallel expansion / contraction mechanism just before the platform reaches the lowermost position, and is located above the axle. In the posture where it abuts and the push-up bar is located at the top dead center,
Similarly, a contactor is attached to the outer periphery of the wheel so as to contact a portion below the upper end of the wheel.

E action When the push-up bar is moved in a parallel crank motion to push up the locking member, the stopper releases the locking, and then the lift-down operation is performed, the wheel provided at the tip of the sliding side link hits the contact. The contactor is pushed up as the wheel moves, and then moves with the wheel.
As a result, the push-up bar makes a parallel crank movement in the opposite direction to the above and descends, and the locking member is reset to a state capable of locking with the rack.

F. Embodiment An elevator safety device according to the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 is a rectangular frame, which is a base frame horizontally set on the floor as a base.
A pair of left and right X-shaped parallel expansion / contraction mechanisms 2 are provided on both sides of, and a table plate 3 as a platform is provided above the X-shaped parallel expansion / contraction mechanisms. X-type parallel expansion / contraction mechanism 2
Has a lower one end pivotally attached to the end of the base frame 1, and a wheel 4 attached to the other lower end is slidably arranged along the side plate 1a of the base frame 1. The upper one end is pivotally attached to the end of the table plate 3, and the other upper end is slidable with respect to the back surface of the table plate 3 via wheels 4 '. Further, a hydraulic cylinder 5 is provided between the X-shaped parallel expansion / contraction mechanism 2 and 2 between the lower side of the pivot side link and the back surface of the table plate 3, and the X-shaped parallel expansion / contraction mechanism 2 is moved by the expansion / contraction motion of the cylinder. The table plate 3 can be moved up and down while being opened and closed.

Below the sliding side link 2a in the X-shaped parallel expansion / contraction mechanism 2, an arm member 6 rotatable about the shaft of the wheel 4 is attached, and the free end of the arm member 6 is directed outward. Locking pin 7 which is a locking member is provided in a protruding manner,
The locking pin 7 is a rack 8 carved on the upper edge of the side plate of the base frame 1.
It is designed to be locked. On the outer surface of the side plate 1a, there is provided a push-up bar 10 which makes a parallel crank motion with respect to the upper edge of the side plate by two parallel links 9 and 9 '. The large-diameter portion comes into contact with the upper edge of the push-up bar 10 and is lifted, and is separated from the rack 8 or is lowered and brought into a locked state. On the outer surface of the side plate 1a, the push-up bar 11 slightly exceeds the top dead center due to the parallel crank motion, the locked state is released, and the large-diameter portion of the tip of the locking pin 7 is slidable on the push-up bar 10. In the moving position,
A stopper 11 for contacting the parallel link 9 on one side to maintain its posture is provided, and the fulcrum of the parallel link 9'is connected so as to operate the left and right parallel links 9, 9 (9 ', 9') in synchronization. A handle coupling portion 13 that is coupled by a shaft 12 and that allows the coupling shaft to be manually rotatable is provided at one end thereof.

Further, when the table plate 3 approaches the lowest position, the tip end of the push-up bar 10 comes in contact with above the axle of the wheel 4 provided at the lower end of the sliding side link 2a of the X-shaped parallel expansion / contraction mechanism 2. By moving upward in an arc shape along the outer periphery of the wheel 4, the parallel links 9, (9 ') are first pushed up until reaching the top dead center, and then pushed down in the moving direction of the wheel 4, thereby pushing up the push-up bar 10. In order to lower the lock mechanism so that the locking mechanism can be returned to the operable state, the contactor 1 formed of a plate-like body
4 are provided. The tip of the contactor comes into contact with the outer periphery of the wheel within a range right above and right next to the axle and contacts at least the upper end of the wheel at the top dead center of the push-up bar. In consideration of the fact that the wheel passes under the contact due to the reduction of frictional force, it is desirable to provide another contact that is pressed by the movement of the wheel.

In order to operate an elevator equipped with a safety device formed in this way, when it is to be lifted down, for example, the handle 15
By rotating the connecting shaft 12 by using, the parallel link 9 is raised to raise the push-up bar 10 and rotate it until it comes into contact with the stopper 11 (FIG. 3). Then, the locking mechanism is unlocked, and the table plate descends as the cylinder contracts. When the descent operation is about to end, as shown in FIGS.
4, the contactor 14 is once lifted, and when the parallel link 9 (9 ') becomes vertical, it moves horizontally and pushes up the push-up bar 10, whereby the locking pin 7
Is returned to the state in which it can be locked to the rack 8 (fourth
Figure). Therefore, when lifting up again, it is not necessary to reset the locking mechanism one by one.

In the present embodiment, the X-type parallel expansion and contraction mechanism has been described as a single-stage structure, but it is also possible to have a structure in which it is connected in two upper and lower stages. Alternatively, the base frame may be not only a fixed type but also a movable type with wheels. In addition, the shape of the locking pin and contactor and their mounting mechanism, etc.
The present invention may be appropriately modified within the range in which the above-mentioned object can be achieved.

Advantageous Effects According to the present invention, the resetting of the locking mechanism is reliably performed by a simple mechanical operation that is interlocked with the descending operation of the platform, so the reliability is high and there is no risk of forgetting to hang it. Therefore, an elevator having excellent safety can be provided at a low cost, and the actual profit is enormous.

[Brief description of drawings]

FIG. 1 is a front view showing an elevator according to the present invention, and FIGS.
FIG. 4 is an operation explanatory view showing a safety device of the elevator, and FIG.
FIGS. 6A to 6D are explanatory views of an operation process in which the push-up bar is reset by the wheel via the contactor, and FIGS. 6A and 6B are explanatory views of a lift equipped with a conventional safety device. 1 ... Base frame, 1a ... Side plate, 2 ... X-type parallel expansion / contraction mechanism,
2a ... Sliding side link, 2b ... Pivoting side link, 3 ...
Table board, 3 '... Stand, 4, 4' ... Wheels, 5 ...
... hydraulic cylinder, 6 ... arm member, 7 ... locking pin,
8 ... Rack, 9, 9 '... Parallel link, 10 ... Push-up bar, 11 ... Stopper, 12 ... Connecting shaft, 13 ...
… Handle coupling part, 14 …… contactor, 15 …… handle, 16 …… supporting rod, 17 …… locking claw

Claims (2)

[Scope of utility model registration request] 1. A pair of X-shaped parallel expansion / contraction mechanisms pivotally attach one lower end portion to the left and right sides of a base frame, which is a base, to the end portion of the base frame, and the other lower end portion. It is provided so that it can slide along the frame, and on top of the X-shaped parallel expansion / contraction mechanism, a platform is pivotally attached to the end of the back surface of the platform so that the upper end of the X-shaped parallel expansion / contraction mechanism can be rotated. At the same time, the upper end of the X-shaped parallel expansion / contraction mechanism is slidably provided on the back surface on the other end side, and the drive means opens and closes the X-shaped parallel expansion / contraction mechanism to lift and lower the platform. Between the lower end of the X-shaped parallel expansion and contraction mechanism and the base frame,
A locking mechanism including a rack member provided on the upper edge of the base frame and a locking member attached to the other lower end of the X-shaped parallel expansion / contraction mechanism for locking the rack member is provided. At the same time, a parallel cranking motion is performed with respect to the rack member to push up the locking member, and a push-up bar that allows the locking mechanism to be unlocked by moving the locking member away from the rack is provided. A stopper is provided to stop the member at the lock release position where the member separates from the rack, and the push-up bar has the posture in which the push-up bar unlocks the locking mechanism. In a posture in which the wheel outer periphery provided on the other lower end of the X-type parallel expansion / contraction mechanism is in contact with the upper portion of the axle and the push-up bar is located at the top dead center, the outer periphery of the wheel is also lower than the upper end thereof. Safety device of the elevator, characterized in that fitted with contacts in contact with the position. 2. The utility model registration according to claim 1, wherein the contactor is a single plate-like body whose tip is in contact with the outer periphery of the wheel within a range right above and right next to the axle. Elevator safety device.