JPH0524698Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a fall prevention device for a lifting deck used at construction sites and the like.

(Prior art) This type of device includes one that gently stops the rail by pressing a resistor similar to a brake shoe (Utility Model Publication No. 55-20704, Utility Model Publication No. 61-6062, etc.).
It is activated by a change (loss) in tension, such as when the rope is cut.

(Technical Issue) However, if the descending speed becomes excessive, a dangerous situation may occur even if there is no failure of the drive system, such as rope breakage, and conventional equipment cannot avoid this danger. Furthermore, conventional equipment cannot be used as is for elevators that do not use ropes.

The purpose of this invention is to solve the above-mentioned problems, and it has a function that automatically detects and activates when the descending speed becomes excessive, and is also effective for those that do not use ropes. The present invention provides a fall prevention device for a lifting deck.

(Technical means) The purpose is to provide a rack rod 2 provided along the elevating path of the deck 1, a pinion 3 provided on the deck side that engages and rotates with the rack rod as the deck moves up and down, and a rack rod 2 that is rotated by the pinion. A rotary disk 5 provided on the main shaft 4 that rotates and a plurality of wings 6 that are pivotally supported on the rotary disk so as to protrude outward due to centrifugal force when the rotational speed exceeds a set value, and engage with the wings when protruding. It has an integral pin 7 arranged at a position where
A trigger 8 that swings due to the engagement, a braking body 10 that is latched to the trigger while being biased by a spring 9, detaches from the trigger when swinging, and protrudes in a predetermined direction due to the biasing force of the spring, and the braking body This can be achieved by a configuration including a rail 11 provided along a lift path that can be press-contacted.

(Embodiment) Referring to the drawings, the deck 1 has a substantially L-shaped side surface, and is equipped with a drive source 14 at the bottom and the device A according to the invention at the top. A type C cage is installed. The guide rail 11 serving as a guide for lifting and lowering has a substantially U-shaped cross section, and a pair of left and right sides are connected outwardly to the building frame or temporary frame B along the lifting route. It also functions as a pressure contact partner and a guide rail for the guide roller 13. In the drive system,
15 is a motor as a driving source, 16 is a speed reducer, 1
7 is an output gear, which is the rack 1 of rack rod 2 which will be described later.
8 (Fig. 5). 19 is a frame on the deck side, 20 is an adjustment roll provided thereon so as to be movable toward the back of the rack, 21 is an adjustment screw thereof, and 22 is a roll fixing screw. Further, 23 indicates a stay for mounting the guide roller 13, and 24 indicates a guide groove of a rail on which the roller 13 moves.

Fall prevention device A is the upper frame 25 of deck 1.
As shown in FIGS. 6 to 9, it has a main shaft 4 supported by a beam 26 in the middle of the frame so as to protrude rearward via a mounting member 27, and has the aforementioned main shaft 4 at its rear end. Rack 18 of Rack Rod 2
A pinion 3 that meshes with and rotates is directly fixed, and a rotary disk 5 is also directly fixed to the front end of the pinion 3.
28 indicates a bearing of the main shaft. The illustrated rotary disk 5 has a circular shape, and has four wings 6 at equal intervals on the periphery, which are pivotally supported at the ends so as to be able to protrude outward from the periphery. 29 indicates a support shaft of the wing 6. Each wing 6 may have the same shape and size, but must have enough weight to swing the trigger 8 by centrifugal force due to rotation. The trigger 8 has a substantially gate shape, has a pin 7 protruding from an upper horizontal rod portion that can be engaged with the wing 6, is swingably supported on the upper frame 25 by a pair of vertical rod portions, and is vertically supported by a pair of vertical rod portions. A hook 30 is provided at the lower end of the rod. This hook 30 locks the brake body 10, and is released from the brake body 10 by swinging of the trigger. 30a is a locking spring that resists its release;
Reference numeral 31 denotes a locking portion that engages and disengages from the hook 30, and is provided at two locations on the left and right sides of the upper part of the brake body. The braking body 10 has a pair of vertical rods 3 at equal intervals to the distance between the pair of guide rails.
A guide rod 33, which is formed into a substantially gate shape having a diameter of 2, and is suspended at the center, is inserted into the beam 26 so as to be able to move up and down, and a spring 9 is compressed between the lower end of the beam and a spring receiver 34 at the lower end of the guide rod. The brake pawl 3 is mounted on the upper frame 25 in a state where it is always urged downward, and is slightly separated from the braking surface 35 of the guide rail 11 in this state and comes into pressure contact with the braking surface 35 during operation.
6 is provided at the lower end of each vertical rod 32. 37 is a link rod connecting the lower end of the vertical rod and the brake pawl 36; 38;
Reference numeral 39 denotes each connecting shaft, and the shaft 38 on the brake claw side is fixed to the upper frame 25. Further, 40 is a desorption prevention device, which has a pressure roll 41 that presses the side surface of the rail.

(Function) In the proposed device configured as described above, as the elevating deck moves up and down, the turntable 5 also rotates, and depending on the speed, the wings 6 protrude outward due to centrifugal force, but within the set range. Since it does not engage with the pin 7, or even if it does contact, it does not exert enough torque to swing the trigger 8, so it does not operate under normal conditions.

Now, if the lifting speed exceeds the set range for some reason, the trigger 8 is moved by the wings 6 that protrude outward due to centrifugal force, and the hook 30 is disengaged from the locking part 31. The heated spring 9 expands rapidly, and the brake body 10
is pressed down to keep the brake pawl 36 in pressure contact with the brake surface 35 of the guide rail 11, thereby stopping the elevating deck.

To release the operation, after confirming safety, the brake body 10 is pushed up, the trigger 8 is returned to its original position, and the hook 30 is locked in the locking portion 31.

(Effects) Therefore, according to the present invention, when the descending speed becomes excessive, the governor function can automatically detect this and stop the descending, so it is highly safe and does not use ropes. Since it can also be attached to elevators, it is versatile and can be expected to have significant practical effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a front view of the entire elevating deck, Fig. 2 is a right side view, Fig. 3 is a front view of the deck part, Fig. 4 is a left side view, and Fig. 4 is a left side view. Figure 5 is a cross-sectional view of the drive unit, Figure 6 is a front view of the proposed device, Figure 7 is a right side view, Figures 8 and 9 are perspective views illustrating before and after operation, and Figure 10 is detachment. FIG. 3 is a side view of the prevention device. 1...Deck, 2...Rack rod, 3...Pinion, 4...Main shaft, 5...Rotary disk, 6...Wing, 7...Pin, 8...Trigger, 9...Spring,
10...Brake body, 11...Rail, 12...Drive pinion, 13...Guide roller.

Claims (1)

[Claims for Utility Model Registration] 1. A rack rod 2 provided along the elevating path of the deck 1; a pinion 3 provided on the deck side that meshes with and rotates with the rack rod as the deck moves up and down;
A rotary disk 5 provided on the main shaft 4 rotated by a pinion, a plurality of wings 6 supported on the rotary disk so as to protrude outward due to centrifugal force when the rotational speed exceeds a set value, and wings when protruding. The pin 7 is integrally arranged at a position to engage with the trigger 8, which swings due to said engagement, and is locked to the trigger while being biased by a spring 9, and comes off from the trigger when swinging. A fall prevention device for a lifting deck, comprising a brake body 10 that protrudes in a predetermined direction by a spring biasing force, and a rail 11 provided along a lift path to which the brake body can be pressed. 2 The rack rod 2 is the drive pinion 1 for lifting and lowering the deck.
2 is common with the lock rod that engages, and rail 1
1 is a guide roller 13 attached to the deck 1
2. The fall prevention device for an elevating deck according to claim 1, which is common to a guide rail for rolling the deck.