JPH0111905Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an opening/closing device for a floor door installed in an opening in the floor between an upper floor and a lower floor, in order to allow cargo to flow between the upper and lower floors.

A conventional device in which a piston-cylinder device is used to simply open and close a floor door with one end pivotally connected is dangerous because if someone is on top of the door when the floor door is opened, there is a risk of the person falling downstairs.

The floor door opening/closing device of this invention was proposed to eliminate the above-mentioned danger. A piston-cylinder device with one end pivoted on the bottom and the other end pivoted on the stationary part on the floor side, and a guide member with one end pivoted on the bottom of the door and provided on the stationary part on the floor side, and the other end is vertically connected. It is characterized by being equipped with a guide rod that moves up and down.

The following will explain the embodiments shown in the drawings.

In Figures 1 and 2, 1 indicates the floor that separates the upper floor A and the lower floor B, and the floor 1 is used for distributing cargo between the upper floor A and the lower floor B, such as by throwing cargo down. An opening 2 is provided for this purpose. Reference numeral 3 denotes a floor door provided at the opening 2, and when the opening 2 is not in use, the edge 2 provided at the inner circumference of the opening 2 is opened as shown in the figure.
It is placed in a place such as a. One end 4a of a hydraulic piston cylinder device 4 is pivotally connected to the bottom of the door 3, and the other end 4b of the piston cylinder device 4 is pivotally connected to an immovable part on the floor side such as the main frame 5 of this device. . In the illustrated example, the other end 4b is the side plates 5a, 5 of the main frame 5.
It is pivotally connected to a U-shaped cross member 5b extending over the section a. Reference numeral 5c is a bracket for pivotally mounting the other end 4b of the piston cylinder device 4, and is fixed to the cross member 5b. The piston cylinder device 4 is normally of a double acting type.

Reference numeral 6 denotes a guide rod whose one end 6a is pivotally connected to the bottom of the floor door 3, and the other end 6b has a stopper 6c that defines the lower limit of the vertical movement of the guide rod 6. This guide rod 6
The other end side 6b is the piston cylinder device 4 described above.
When the door 3 moves up and down as it expands and contracts, it is guided by the through hole 7a of the fixed guide member 7 and vertically slides up and down within a predetermined range. The guide member 7 is an immovable part on the floor side, for example, a U-shaped support member 5d stretched between the side plates 5a, 5a of the main frame 5.
It is fixedly installed in etc.

In the embodiment, the vertical movement device consisting of the piston cylinder device 4, the guide rod 6, and the guide member 7 described above is located at the left and right sides of the door 3 when viewed in plan, as schematically shown in FIG. Although they are provided in pairs, one of each may be provided in the center.

The floor door 3 rises while maintaining a horizontal state, as will be described in detail later, from the time of closing shown in FIG. 2 to the initial stage of being opened by the piston cylinder device 4. Therefore, the center of gravity of the door 3 is at one end (upper end) of the door 3 and the piston cylinder device 4.
4a (to the right in the drawing), and when the door 3 is raised horizontally, the lower surface of the door 3 is located at one end (upper end) of each of the guide rods 6.
It is supported by a limiting member 12 fixed to 6a. Each restriction member 12 is fixedly attached to the upper end 6a of the guide rod 6 so as to hold the upper end 6a of the guide rod 6 at its lower part, and its upper surface is formed horizontally so that it can be closely supported by the lower surface of the door 3. has been done.

As shown in FIG. 2, a plurality of suspension rods 8a with springs (not shown) interposed around the bottom surface of the door 3
The safety device 8 is elastically suspended by the
During the closing operation of the door 3, when an obstacle such as a load is caught between the door 3 and the opening 2 of the floor 1, the safety device 8 moves upward and a limit switch (not shown) built into the safety device 8 is activated. ) acts to interrupt the operation of the piston cylinder device 4. In addition,
In the figure, the reference numeral 9 indicates a stopper provided on the fixed part on the floor side, and the reference numeral 10 indicates a stopper provided on the bottom of the door 3. Both stoppers 9 and 10 hold the door 3 in a predetermined closed position. . Also, code 14
is a guard pipe with one end fixed to the lower surface of the door 3, and is used to prevent a person from falling from the opening 2 when the door 3 is opened, and can be held onto this to maintain safety.

Next, the operation of the floor door opening/closing device of this invention will be explained.

In the closed state of the door shown in FIGS. 1 and 2, when pressure fluid is introduced into the piston-cylinder device 4 and it expands, the guide rod 6 is guided by the fixed guide member 7 and stopped at its stopper 6c. Move up by a distance l to . Since the center of gravity of the door 3 is located in front of the pivot pin 11 of the door 3 and the piston cylinder device 4, during this time the door 3 is supported by the limiting member 12 and rises while maintaining a horizontal state, as shown in FIG. reaches the position shown by the solid line. (In Figure 3, the safety device 8 and stoppers 9 and 10 provided on the bottom surface of the door 3
are omitted from illustration. ) Here, when the piston cylinder device 4 further extends, as shown in FIG. pivots around the pivot pin 13 of the door 3 and the guide rod 6 in the range indicated by the arrow P, and reaches the open position shown by the chain line. Since the operation from the open state to the closed state is completely opposite to the above,
The explanation will be omitted here.

According to the floor door opening/closing device of this invention described above, in the opening operation, the door 3, which is attached to the opening 2 of the floor 1, once rises horizontally and then swings to open. Therefore, even if someone is on the door 3, they can be easily avoided, which is extremely effective in terms of work safety. Especially door 3
The speed at which the door rises horizontally or descends horizontally is slower than the speed at which it swings and rotates, which makes it possible to prevent danger to people and objects getting caught when opening and closing the door. be.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the floor door opening/closing device of this invention, FIG. 2 is a longitudinal side view thereof, and FIG. 3 is a longitudinal side view of the opening/closing device with some portions omitted. 1... Floor, 2... Opening, 3... Door, 4... Piston cylinder device, 6... Guide rod, 7... Guide member, A... Upstairs, B... Downstairs.

Claims (1)

[Scope of utility model registration request] Opening 2 in floor 1 between upstairs A and downstairs B
a piston-cylinder device 4 having one end 4a pivotally connected to the bottom of the door 3 and the other end 4b pivotally connected to an immovable part on the floor side;
A door opening/closing device for a floor surface door, which is equipped with a guide rod 6 which is pivotably mounted on the guide rod 6 and which moves the other end 6b vertically up and down with a guide member 7 provided on an immovable part on the floor side.