EP2426076B1

EP2426076B1 - Elevator door device

Info

Publication number: EP2426076B1
Application number: EP09843994.6A
Authority: EP
Inventors: Masaya Kitazawa; Hiroshi Kigawa; Naotoshi Ito
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2009-04-28
Filing date: 2009-04-28
Publication date: 2018-10-10
Anticipated expiration: 2029-04-28
Also published as: EP2426076A1; JP5289562B2; WO2010125650A1; CN102414113B; KR20110103451A; KR101274383B1; JPWO2010125650A1; EP2426076A4; CN102414113A

Description

TECHNICAL FIELD

The present invention relates to an elevator door apparatus that opens and closes an elevator doorway by moving a car door and a landing door in a state in which a car engaging apparatus that is disposed on a car door and a landing engaging apparatus that is disposed on a landing door are engaged with each other.

BACKGROUND ART

Generally, in elevator door apparatuses, a car engaging apparatus is disposed on a the car door that opens and closes a car doorway, and a landing engaging apparatus is disposed on a landing door that opens and closes the landing doorway. The car engaging apparatus and the landing engaging apparatus are able to engage with each other horizontally when the car is stopped at a landing. The landing door is moved horizontally together with the car door by the car engaging apparatus and the landing engaging apparatus being engaged with each other. The car doorway is opened and closed by the horizontal movement of the car door, and the landing doorway is opened and closed by the horizontal movement of the landing door.
Conventionally, in order to suppress swinging of the landing door relative to the car door when the landing door is moved together with the car door, elevator door apparatuses have been proposed in which the car engaging apparatus has a pair of blades, and the landing engaging apparatus is held by widening spacing between the blades. Each of the blades is mounted to a parallel link that is pivotably disposed on the car door. A swinging member that is mounted pivotably to an upper portion of the car door is connected to a first of the blades by means of a linking rod. The swinging member is pivoted by coming into contact with a cam that is fixed to an upper portion of the car doorway while moving together with the car door. The blades are displaced toward each other while rotating the parallel link by the first blade being pulled upward by rotation of the swinging member. The landing engaging apparatus is held by the car engaging apparatus in a state in which the spacing between the blades is widened. Holding of the landing engaging apparatus by the car engaging apparatus is released by the first blade being pulled upward such that the blades approach each other (See Patent Literature 1).
Other examples can be seen in Patent Literature 2 to Patent Literature 5.

[Patent Literature 1] Japanese Utility Model Laid-Open No. SHO 62-98678 (Gazette )
[Patent Literature 2] JP S58 17089 A
[Patent Literature 3] JP 57 203682 A
[Patent Literature 4] EP 0 410 774 A2
[Patent Literature 5] JP 2008 230844 A

DISCLOSURE OF THE INVENTION

PROBLEM TO BE SOLVED BY THE INVENTION

However, in conventional elevator door apparatuses, the respective directions of pivoting of the swinging member and the parallel link when the first blade is pulled upward are reverse directions to each other. Consequently, the swinging member and the parallel link are pivoted in directions in which inclination of the linking rod changes significantly. Because of this, if the position of the first blade relative to the swinging member deviates even slightly from the design position, the amount of pivoting of the parallel link relative to the amount of pivoting of the swinging member deviates significantly from the design value, making it impossible to displace the blades as designed.
During installation of the elevator door apparatuses, it may be necessary to adjust the position of the blades horizontally relative to the landing engaging apparatus. If such an adjustment is made in conventional elevator door apparatuses, the position of the swinging member must also be adjusted to match the position of the first blade because the position of the first blade deviates relative to the swinging member. Consequently, elevator door apparatus installation work is time-consuming.
The present invention aims to solve the above problems and an object of the present invention is to provide an elevator door apparatus that enables installation work to be performed easily.

MEANS FOR SOLVING THE PROBLEM

In order to achieve the above object, according to one aspect of the present invention, there is provided an elevator door apparatus including: a car door that opens and closes a car doorway by moving in a direction of frontage of the car doorway; a car engaging apparatus including: a fixed blade that is fixed to the car door; a pivoting link that is pivotable around a link supporting shaft that is disposed on the car door; and a movable blade that is disposed on the pivoting link, and that is displaced in response to the pivoting of the pivoting link between a gripping position in which spacing from the fixed blade is a predetermined spacing in the direction of movement of the car door, and a releasing position that is further away from the fixed blade than the gripping position; a gripping driving apparatus including: a pivoting lever that is pivotable around a lever supporting shaft that is disposed on the car door; a coupling member that makes the pivoting lever and the pivoting link operate interdependently with each other; and a cam that is fixed relative to the car doorway, and that pivots the pivoting lever that is moved together with the car door, the gripping driving apparatus making the movable blade reach the releasing position when the car door reaches a position at which the car doorway is closed; a landing engaging apparatus that can engage the fixed blade in the direction of movement of the car door, and that is gripped between the movable blade and the fixed blade when the movable blade is in the gripping position; and a landing door on which the landing engaging apparatus is disposed, and that opens and closes a landing doorway by being moved together with the car door in a state in which the landing engaging apparatus and the fixed blade are engaged with each other, wherein the movable blade is separated from the pivoting lever, the pivoting link and the pivoting lever operating interdependently with each other such that a direction of pivoting of the pivoting link around the link supporting shaft and a direction of pivoting of the pivoting lever around the lever supporting shaft are identical directions.

EFFECTS OF THE INVENTION

In an elevator door apparatus according to the present invention, because the pivoting link and the pivoting lever operate interdependently with each other such that the direction of pivoting of the pivoting link around the link supporting shaft and the direction of pivoting of the pivoting lever around the lever supporting shaft are identical directions, inclination of the coupling member can be prevented from changing significantly when the pivoting link and the pivoting lever are pivoted. Consequently, even if the position of the car engaging apparatus relative to the pivoting lever is shifted by adjusting the position of the car engaging apparatus during installation, the amount of displacement of the movable blade relative to the amount of pivoting of the pivoting lever can be prevented from changing significantly. Operations to adjust the position of the pivoting lever can thereby be avoided during installation of the elevator door apparatus, enabling elevator door apparatus installation work to be facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a front elevation that shows an elevator door apparatus according to Embodiment 1 of the present invention;
Figure 2 is a front elevation that shows a state when the elevator door apparatus from Figure 1 performs a door opening operation;
Figure 3 is a front elevation that shows another example of an elevator door apparatus according to Embodiment 1 of the present invention; and
Figure 4 is a front elevation that shows an elevator door apparatus according to Embodiment 2 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Preferred embodiments of the present invention will now be explained with reference to the drawings.

Embodiment 1

Figure 1 is a front elevation that shows an elevator door apparatus according to Embodiment 1 of the present invention. Figure 2 is a front elevation that shows a state when the elevator door apparatus from Figure 1 performs a door opening operation. Moreover, Figures 1 and 2 are front elevations when a car is viewed from a landing. In the figures, a car doorway 2 is disposed on a car 1 that can be moved inside a hoistway. A hanger case 3 that is disposed on an upper portion of the car doorway 2 is fixed to the car 1. A car door rail 4 that is parallel to a direction of frontage of the car doorway 2 is fixed to a lower portion of the hanger case 3.
A pair of car doors 5 are suspended on the car door rail 4. Each of the car doors 5 has: a door panel 6 that opens and closes the car doorway 2; and a door hanger 7 that is fixed to an upper portion of the door panel 6, and that is hooked onto the car door rail 4. The car doors 5 are movable in a direction of frontage of the car doorway 2 (horizontally) while being guided by the car door rail 4. The car doorway 2 is opened and closed by each of the car doors 5 being moved in the direction of frontage of the car doorway 2.
A door driving apparatus 8 is fixed to an upper portion of the hanger case 3. The door driving apparatus 8 has: a door driving apparatus main body 9 that includes a motor; and a driving pulley 10 that is rotated by a driving force from the door driving apparatus main body 9.
A first driven pulley 11 and a transmitting pulley that are rotated together are disposed coaxially on a first end portion of the hanger case 3. A second driven pulley 12 is disposed on a second end portion of the hanger case 3. An endless driving belt 13 is wound around the driving pulley 10 and the transmitting pulley, and an endless door belt 14 is wound around the first and second driven pulleys 11 and 12. The first driven pulley 11 is rotated by the rotation of the driving pulley 10. The door belt 14 is moved cyclically by the rotation of the first driven pulley 11. The second driven pulley 12 is rotated by the cyclic motion of the door belt 14.
The car doors 5 are connected to the door belt 14 by means of respective metal connecting fittings 15 and 16. One metal connecting fitting 15 is mounted to the door hanger 7 of one car door 5, and the other metal connecting fitting 16 is mounted to the door hanger 7 of the other car door 5. The car doors 5 are moved in opposite directions to each other by the cyclic motion of the door belt 14.
Landing doorways (not shown) are disposed on landings of respective building floors. Landing door rails (not shown) that are fixed to inner wall surfaces of the hoistway are disposed on upper portions of the landing doorways. Pairs of landing doors (not shown) are suspended on the landing door rails. The respective landing doors are movable in the direction of frontage of the landing doorways (horizontally) under guidance from the landing door rails. The landing doorways are opened and closed by the respective landing doors being moved in the direction of frontage of the landing doorways. The respective landing doors are constantly forced in a direction that closes the landing doorways (a door closing direction) by forcing apparatuses (not shown) that include weights or springs.
Moreover, elevator doorways are constituted by the car doorway and the landing doorways, and elevator doors are constituted by the car doors 5 and the landing doors.
When the car 1 is stopped at the landings of the respective building floors, the car doors 5 and the landing doors are positioned opposite each other in the depth direction of the car 1. A car engaging apparatus 17 that is disposed on one of the car doors 5 and a landing engaging apparatus 18 that is disposed on one of the landing doors are disposed between the car doors 5 and the landing doors.
The car engaging apparatus 17 is mounted to the door panel 6. The car engaging apparatus 17 has: a fixed blade 19 that is fixed to the door panel 6; a driving link (a pivoting link) 20 that is mounted pivotably onto the door panel 6; a movable blade 21 that is disposed on the driving link 20, and that is displaced relative to the fixed blade 19 by the pivoting of the driving link 20; and a driven link 22 that is mounted pivotably to the door pane! 6, and that is pivoted relative to the door panel 6 together with the displacement of the movable blade 21.
The fixed blade 19 and the movable blade 21 are each disposed parallel to the direction of movement of the car 1 (vertically). The fixed blade 19 and the movable blade 21 are able to engage with the landing engaging apparatus 18 in the direction of movement of the car doors 5 (horizontally) when the car is stopped at a landing of a building floor.
The fixed blade 19 is disposed closer to a closed door side than the landing engaging apparatus 18, and the movable blade 21 is disposed closer to an open door side than the landing engaging apparatus 18. Consequently, the landing engaging apparatus 18 enters between the fixed blade 19 and the movable blade 21 when the car 1 is stopped at a landing of a building floor.
The movable blade 21 is displaceable between a gripping position (Figure 2) in which spacing from the fixed blade 19 is a predetermined spacing in the direction of movement of the car doors 5 (the direction of frontage of the car doorway 2), and a releasing position (Figure 1) that is further away from the fixed blade 19 than the gripping position. The movable blade 21 is displaced between the gripping position and the releasing position in response to the pivoting of the driving link 20.
The landing engaging apparatus 18 is gripped between the fixed blade 19 and the movable blade 21 when the movable blade 21 is in the gripping position. Gripping of the landing engaging apparatus 18 between the fixed blade 19 and the movable blade 21 is released by the movable blade 21 being displaced to the releasing position.
The driving link 20 is pivotable around a first panel mounting shaft (a link supporting shaft) 23 that is disposed on the door panel 6. The driven link 22 is pivotable around a second panel mounting shaft 24 that is disposed on the door panel 6.
The first and second panel mounting shafts 23 and 24 are disposed so as to be spaced apart from each other vertically. The first and second panel mounting shafts 23 and 24 are disposed closer to the open door side than the fixed blade 19. The respective shaft axes of the first and second panel mounting shafts 23 and 24 are perpendicular to a panel surface of the door panel 6.
An intermediate portion of the driving link 20 is mounted to the first panel mounting shaft 23. A blade mounting shaft 25 is disposed on a first end portion of the driving link 20, and a link connecting shaft 26 is disposed on a second end portion of the driving link 20. In this example, the shape of the driving link 20 is a curved shape that is bent at the position of the first panel mounting shaft 23.
The blade mounting shaft 25 is positioned closer to the closed door side than the first panel mounting shaft 23, and the link connecting shaft 26 is positioned closer to the open door side than the first panel mounting shaft 23. The blade mounting shaft 25 and the link connecting shaft 26 are disposed such that each is parallel to the first panel mounting shaft 23.
A first end portion of the driven link 22 is mounted to the second panel mounting shaft 24. A blade mounting shaft 27 is disposed on a second end portion of the driven link 22. The blade mounting shaft 27 is disposed so as to be parallel to the second panel mounting shaft 24.
The movable blade 21 is mounted pivotably onto each of the blade mounting shafts 25 and 27. By being mounted to each of the blade mounting shafts 25 and 27, the movable blade 21 is disposed in a position that is closer to the fixed blade 19 than the first and second panel mounting shafts 23 and 24. A distance between the blade mounting shafts 25 and 27 is identical to a distance between the first and second panel mounting shafts 23 and 24. A distance between the blade mounting shaft 25 and the first panel mounting shaft 23 is identical to the distance between the blade mounting shaft 27 and the second panel mounting shaft 24. Consequently, the movable blade 21 is displaced by the pivoting of the driving link 20 so as to be kept parallel to the fixed blade 19.
When the movable blade 21 is in the gripping position, a direction of a straight line that joins the first panel mounting shaft 23 and the blade mounting shaft 25 is identical to the direction of movement of the car doors 5 (Figure 2). A stopper 28 that restricts displacement of the movable blade 21 is fixed to the door panel 6. The stopper 28 catches the driving link 20 when the movable blade 21 reaches the gripping position. The movable blade 21 is thereby prevented from going beyond the gripping position.
The landing engaging apparatus 18 has: a fixed engaging roller 29 that is rotatable around a fixed shaft that is mounted to the landing doors; and a movable engaging roller 30 that is rotatable around a movable shaft that is displaceable relative to the landing doors.
The movable engaging roller 30 is mounted to an engaging apparatus lever (not shown) that is pivotable around the fixed shaft of the fixed engaging roller 29. The movable engaging roller 30 can be displaced by the pivoting of the engaging apparatus lever between an advanced position (Figure 1) that is closer to the closed door side than the fixed engaging roller 29, and a retracted position (Figure 2) that is positioned closer to the open door side than the advanced position. The engaging apparatus lever is forced in a direction in which the movable engaging roller 30 is displaced toward the advanced position by a spring (not shown).
The movable engaging roller 30 is pushed by the fixed blade 19 that is moved together with the car doors 5 in the door opening direction, and thereby displaced toward the retracted position from the advanced position in opposition to the force from the spring. The fixed engaging roller 29 is engaged with the fixed blade 19 when the movable engaging roller 30 reaches the retracted position while being pushed by the fixed blade 19. The landing doors are moved together with the car doors 5 in a state in which the fixed engaging roller 29 and the fixed blade 19 are engaged with each other.
The landing doors are locked by a locking apparatus 31 when both the car doorway 2 and the landing doorway are closed. The locking apparatus 31 has: a hook member 32 that operates interdependently with the movable engaging roller 30; and an engaging member (not shown) that is fixed to an upper portion of the landing doorway, and into which the hook member 32 is hooked.
When the landing doors are in a position at which the landing doorway is closed, the movable engaging roller 30 is displaced toward the advanced position, and the hook member 32 is thereby hooked onto the engaging member (Figure 1). The landing doors are thereby locked. When the movable engaging roller 30 shifts from the advanced position, the state in which the hook member 32 is hooked onto the engaging member is released (Figure 2). Locking of the landing doors is thereby released.
Displacement of the movable blade 21 toward the gripping position is performed by the driving link 20 being pivoted due to deadweight from the movable blade 21. Displacement of the movable blade 21 toward the releasing position is performed by the driving link 20 being pivoted by a driving force from a gripping driving apparatus 33 in opposition to the deadweight from the movable blade 21.
The gripping driving apparatus 33 has: a pivoting lever 34 that is mounted pivotably onto the door hanger 7; a coupling rod (a coupling member) 35 that makes the pivoting lever 34 and the driving link 20 operate interdependently with each other; and a cam 36 that is fixed to the hanger case 3, and that pivots the pivoting lever 34, which is moved together with the car doors 5.
The pivoting lever 34 and the car engaging apparatus 17 are mounted to a common car door 5. The pivoting lever 34 is pivotable around a hanger mounting shaft (a lever supporting shaft) 37 that is disposed on the door hanger 7. The hanger mounting shaft 37 is disposed so as to be parallel to the first panel mounting shaft 23. In this example, the shape and size of the pivoting lever 34 are identical to the shape and size of the driving link 20.
An intermediate portion of the pivoting lever 34 is mounted to the hanger mounting shaft 37. A roller shaft 38 is disposed on a first end portion of the pivoting lever 34, and a lever connecting shaft 39 is disposed on a second end portion of the pivoting lever 34. The roller shaft 38 is positioned closer to the closed door side than the hanger mounting shaft 37, and the lever connecting shaft 39 is positioned closer to the open door side than the hanger mounting shaft 37. The roller shaft 38 and the lever connecting shaft 39 are disposed such that each is parallel to the hanger mounting shaft 37.
A first end portion of a coupling rod 35 is mounted pivotably to the link connecting shaft 26, and a second end portion of the coupling rod 35 is mounted pivotably to the lever connecting shaft 39. In other words, the coupling rod 35 is pivotably connected to the driving link 20 by means of the link connecting shaft 26, and is pivotably connected to the pivoting lever 34 so as to have the lever connecting shaft 39 interposed. Thus, the direction of pivoting of the driving link 20 around the first panel mounting shaft 23 and the direction of pivoting of the pivoting lever 34 around the hanger mounting shaft 37 are identical directions.
A distance between the link connecting shaft 26 and the lever connecting shaft 39 is identical to a distance between the first panel mounting shaft 23 and the hanger mounting shaft 37. A distance between the link connecting shaft 26 and the first panel mounting shaft 23 is also identical to a distance between the lever connecting shaft 39 and the hanger mounting shaft 37. Consequently, a parallelogram that has the first panel mounting shaft 23, the link connecting shaft 26, the lever connecting shaft 39, and the hanger mounting shaft 37 as four corners is formed between the driving link 20 and the pivoting lever 34.
A distance between the roller shaft 38 and the hanger mounting shaft 37 is identical to a distance between the blade mounting shaft 25 and the first panel mounting shaft 23. A distance between the roller shaft 38 and the blade mounting shaft 25 is also identical to a distance between the hanger mounting shaft 37 and the first pane! mounting shaft 23. Consequently, a parallelogram that has the first panel mounting shaft 23, the blade mounting shaft 25, the roller shaft 38, and the hanger mounting shaft 37 as four corners is formed between the driving link 20 and the pivoting lever 34.
A guiding roller (a guiding portion) 40 is rotatably mounted to the roller shaft 38. The guiding roller 40 is able to contact the cam 36 when car doors 5 are moved in the direction of frontage of the car doorway 2. The guiding roller 40 contacts the cam 36 only when the car doors 5 are within a predetermined range of movement from a position at which the car doorway 2 is closed to a position at which engagement between the fixed blade 19 and the fixed engaging roller 29 is commenced.
When the guiding roller 40 is separated from the cam 36, the movable blade 21 reaches the gripping position under its own weight. Here, the position of the movable blade 21 is maintained in the gripping position even if the car doors 5 move (Figure 2).
If the car doors 5 are moved in the door closing direction when the guiding roller 40 is contacting the cam 36, the pivoting lever 34 is pivoted in a direction in which the movable blade 21 is displaced toward the releasing position, and if the car doors 5 are moved in the door opening direction, the pivoting lever 34 is pivoted in a direction in which the movable blade 21 is displaced toward the gripping position.
When the pivoting lever 34 is pivoted in the direction in which the movable blade 21 is displaced toward the releasing position, the guiding roller 40 is guided upward by the cam 36. When the pivoting lever 34 is pivoted in the direction in which the movable blade 21 is displaced toward the gripping position, the guiding roller 40 is guided downward by the cam 36.
Next, operation will be explained. When both the car doorway 2 and the landing doorway are closed, the movable blade 21 is held in the gripping position in a state in which the guiding roller 40 contacts the cam 36. At this point, the fixed blade 19 and the movable blade 21 are disposed at positions that are separated from the landing engaging apparatus 18 in the direction of frontage of the car doorway 2. In addition, at this point, the landing doors are locked by the locking apparatus 31 (Figure 1).
When the car doors 5 are moved by the driving force from the door driving apparatus 8 in the door opening direction during a door opening operation, the fixed blade 19 contacts the movable engaging roller 30, and then displaces the movable engaging roller 30 from the advanced position toward the retracted position while pushing the movable engaging roller 30. Engagement of the hook member 32 in the engaging member is thereby disengaged, and locking of the landing doors is released.
At that point, the guiding roller 40 is guided downward while contacting the cam 36 together with the movement of the car doors 5 in the door opening direction. The pivoting lever 34 and the driving link 20 are thereby pivoted in a direction in which the coupling rod 35 is displaced upward, displacing the movable blade 21 from the releasing position toward the gripping position. Here, the pivoting lever 34 and the driving link 20 are pivoted in identical directions.
When the movable engaging roller 30 reaches the retracted position, the fixed blade 19 is engaged by the fixed engaging roller 29 and the movable blade 21 reaches the gripping position. The fixed engaging roller 29 and the movable engaging roller 30 are thereby gripped together between the fixed blade 19 and the movable blade 21. At this point, the guiding roller 40 is separated from the cam 36.
The fixed engaging roller 29 and the movable engaging roller 30 subsequently remain gripped between the fixed blade 19 and the movable blade 21, and the car doors 5 are moved together with the landing doors in the door opening direction to complete the door opening operation.
During the door closing operation, the fixed engaging roller 29 and the movable engaging roller 30 remain gripped between the fixed blade 19 and the movable blade 21, and the car doors 5 are moved together with the landing doors in the door closing direction. When the landing doors subsequently reach a position at which the landing doorway is closed, the guiding roller 40 contacts the cam 36 and the fixed blade 19 is disengaged from the fixed engaging roller 29.
The car doors 5 are subsequently moved further in the door closing direction, and the guiding roller 40 is thereby displaced upward under guidance from the cam 36, pivoting the pivoting lever 34 and the driving link 20 in a direction in which the coupling rod 35 is displaced downward. The movable blade 21 is thereby displaced from the gripping position toward the releasing position. Here, the pivoting lever 34 and the driving link 20 are pivoted in identical directions.
The fixed blade 19 is subsequently separated from the movable engaging roller 30, and the car doors 5 are moved further in the door closing direction, thereby completing the door closing operation.
In an elevator door apparatus of this kind, because the driving link 20 and the pivoting lever 34 operate interdependently with each other such that the direction of pivoting of the driving link 20 around the first panel mounting shaft 23 and the direction of pivoting of the pivoting lever 34 around the hanger mounting shaft 37 are identical directions, inclination of the coupling rod 35 can be prevented from changing significantly when the driving link 20 and the pivoting lever 34 are pivoted. Consequently, even if the position of the car engaging apparatus 17 relative to the pivoting lever 34 is shifted by adjusting the position of the car engaging apparatus 17 during installation, the amount of displacement of the movable blade 21 relative to the amount of pivoting of the pivoting lever 34 can be prevented from changing significantly. Operations to adjust the position of the pivoting lever 34 can thereby be avoided during installation of the elevator door apparatus, enabling elevator door apparatus installation work to be facilitated.
Because the distance between the link connecting shaft 26 and the lever connecting shaft 39 is made identical to the distance between the first panel mounting shaft 23 and the hanger mounting shaft 37, and the distance between the lever connecting shaft 39 and the hanger mounting shaft 37 is made identical to the distance between the link connecting shaft 26 and the first panel mounting shaft 23, the inclination of the coupling rod 35 can always be kept constant even if the driving link 20 and the pivoting lever 34 are pivoted. Consequently, the amount of displacement of the movable blade 21 can be kept constant relative to the amount of pivoting of the pivoting lever 34 even if the position of the car engaging apparatus 17 is shifted relative to the pivoting lever 34, enabling the movable blade 21 to be displaced more accurately.
Because the direction of the straight line that joins the first panel mounting shaft 23 and the blade mounting shaft 25 is identical to the direction of movement of the car doors 5 when the movable blade 21 is in the gripping position, even if the movable blade 21 is subjected to a force in the door opening direction, the movable blade 21 can be prevented from being pushed back from the gripping position to the releasing position, enabling holding of the movable blade 21 in the gripping position to be made more reliable.
Moreover, in the above example, the present invention is applied to an elevator door apparatus in which dimensions between a celling of the car 1 and an upper edge portion of the car doorway 2 are large, and the car engaging apparatus 17 and the gripping driving apparatus 33 are disposed so as to be separated vertically, but as shown in Figure 3, the present invention may also be applied to an elevator door apparatus in which the dimensions between the ceiling of the car 1 and the upper edge portion of the car doorway 2 are reduced, and the gripping driving apparatus 33 partially overlaps with the car engaging apparatus 17 in a vertical direction. In that case, the vertical position of the car engaging apparatus 17 relative to the gripping driving apparatus 33 is adjusted by adjusting the length of the coupling rod 35. The fixed blade 19 and the movable blade 21 are disposed so as to be offset from the gripping driving apparatus 33 in the depth direction of the car 1.

Embodiment 2

Figure 4 is a front elevation that shows an elevator door apparatus according to Embodiment 2 of the present invention. In the figure, a gripping driving apparatus 33 further includes a gripping forcing spring (a forcing body) 51 that forces a pivoting lever 34 in a direction in which a movable blade 21 is displaced toward a gripping position.
In this example, the gripping forcing spring 51 is connected between a door hanger 7 and a portion of the pivoting lever 34 between a hanger mounting shaft 37 and a roller shaft 38. The gripping forcing spring 51 forces the pivoting lever 34 in a direction in which a guiding roller 40 is displaced downward.
A raised portion 52 that displaces the guiding roller 40 upward when car doors 5 are moved in a door dosing direction, and a depressed portion 53 that is continuous with the raised portion 52, and into which the guiding roller 40 fits when the car doors 5 reach a position at which the car doorway 2 is closed are disposed on the cam 36. The gripping forcing spring 51 forces the pivoting lever 34 in a direction in which the guiding roller 40 fits into the depressed portion 53.
Consequently, when the car doors 5 are moved in the door closing direction, the guiding roller 40 contacts the cam 36, and is then displaced upward momentarily before being displaced downward to fit into the depressed portion 53. Thus, when the car doors 5 are moved in the door closing direction, the movable blade 21 is momentarily displaced to a position that further away from a fixed blade 19 than a releasing position, is then displaced to the releasing position. The rest of the configuration is similar to that of Embodiment 1.
In an elevator door apparatus of this kind, because the pivoting lever 34 is forced by the gripping forcing spring 51 in a direction in which the movable blade 21 is displaced toward the gripping position, and the depressed portion 53 into which the guiding roller 40 fits when the car doors 5 reach the position at which the car doorway 2 is closed is disposed on the cam 36, holding of the movable blade 21 in the releasing position can be made more reliable.
Moreover, in the above example, the pivoting lever 34 is forced by the gripping forcing spring 51, but the gripping forcing spring 51 may also be set so as to force the driving link 20. In that case, the driving link 20 is forced in a direction in which the movable blade 21 is displaced toward the gripping position.
In each of the above embodiments, the displacement of the movable blade 21 is restricted by the stopper 28 that receives the driving link 20, but the displacement of the movable blade 21 may also be restricted by a stopper that receives the pivoting lever 34. In that case, the stopper is fixed to the door hanger 7.
In each of the above embodiments, the guiding roller 40 is disposed on the pivoting lever 34 as a guiding portion that is guided together with the movement of the car doors 5 while contacting the cam 36, but is not limited to this, and a protrusion may also be disposed on the pivoting lever 34 as a guiding portion, for example. In that case, the pivoting lever 34 is pivoted by the protrusion being guided while contacting the cam 35.

REFERENCE SIGNS LIST

2 car doorway; 5 car doors; 17 car engaging apparatus; 18 landing engaging apparatus; 19 fixed blade; 20 driving link (pivoting link); 21 movable blade; 25 blade mounting shaft; 26 link connecting shaft; 33 gripping driving apparatus; 34 pivoting lever; 35 coupling rod (coupling member); 36 cam; 37 hanger mounting shaft (lever supporting shaft); 39 lever connecting shaft; 40 guiding roller (guiding portion); 51 gripping forcing spring (forcing body); 53 depressed portion.

Claims

An elevator door apparatus comprising:
a car door (5) that opens and closes a car doorway (2) by moving in a direction of frontage of the car doorway (2);

a car engaging apparatus (17) comprising:
a fixed blade (19) that is fixed to the car door (5);

a pivoting link (20) that is pivotable around a link supporting shaft (23) that is disposed on the car door (5); and

a movable blade (21) that is disposed on the pivoting link (20), and that is displaced in response to the pivoting of the pivoting link (20) between a gripping position in which spacing from the fixed blade (19) is a predetermined spacing in the direction of movement of the car door (5), and a releasing position that is further away from the fixed blade (19) than the gripping position;

a gripping driving apparatus (33) comprising:
a pivoting lever (34) that is pivotable around a lever supporting shaft (37) that is disposed on the car door (5);

a coupling member (35) that makes the pivoting lever (34) and the pivoting link (20) operate interdependently with each other; and

a cam (36) that is fixed relative to the car doorway (2), and that pivots the pivoting lever (20) that is moved together with the car door (5),
the gripping driving apparatus (33) making the movable blade (21) reach the releasing position when the car door (5) reaches a position at which the car doorway (2) is closed;

a landing engaging apparatus (18) that can engage the fixed blade (19) in the direction of movement of the car door (5), and that is gripped between the movable blade (21) and the fixed blade (19) when the movable blade (21) is in the gripping position; and

a landing door on which the landing engaging apparatus (18) is disposed, and that opens and closes a landing doorway by being moved together with the car door (5) in a state in which the landing engaging apparatus (18) and the fixed blade (19) are engaged with each other, whereby

the pivoting link (20) and the pivoting lever (34) operate interdependently with each other such that a direction of pivoting of the pivoting link (20) around the link supporting shaft (23) and a direction of pivoting of the pivoting lever (34) around the lever supporting shaft (37) are identical directions,
the elevator door apparatus being characterized in that:
the movable blade (21) is separated from the pivoting lever (34).
An elevator door apparatus according to Claim 1, characterized in that:
the coupling member (35) is pivotably connected to the pivoting link (20) by means of a link connecting shaft (26), and is pivotably connected to the pivoting lever (34) by means of a lever connecting shaft (39);

a distance between the link connecting shaft (26) and the lever connecting shaft (39) is identical to a distance between the link supporting shaft (23) and the lever supporting shaft (37); and

a distance between the link connecting shaft (26) and the link supporting shaft (23) is identical to a distance between the lever connecting shaft (39) and the lever supporting shaft (37).
An elevator door apparatus according to Claim 1, characterized in that:
the movable blade (21) is disposed pivotably on the pivoting link (20) by means of a blade mounting shaft (25); and

a direction of a straight line that joins the link supporting shaft (23) and the blade mounting shaft (25) when the movable blade (21) is in the gripping position is identical to the direction of movement of the car door (5).
An elevator door apparatus according to Claim 1, characterized in that:
the gripping driving apparatus (33) further comprises a forcing body (51) that forces the pivoting lever (34) in a direction in which the movable blade (21) is displaced toward the gripping position;

a guiding portion (40) that is guided together with the movement of the car door (5) while contacting the cam (36) is disposed on the pivoting lever (34); and

a depressed portion (53) into which the guiding portion (40) fits when the car door (5) reaches a position at which the car doorway (2) is closed is disposed on the cam (36).