Source: https://patents.justia.com/patent/6491136
Timestamp: 2020-07-05 08:40:16
Document Index: 690601354

Matched Legal Cases: ['art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'arts 4', 'arts 4', 'art 4', 'art 4', 'arts 4', 'arts 4', 'arts 4', 'art 4']

US Patent for Traction type elevator apparatus Patent (Patent # 6,491,136 issued December 10, 2002) - Justia Patents Search
Justia Patents And Rotatably Driven Drum Pulling ThereonUS Patent for Traction type elevator apparatus Patent (Patent # 6,491,136)
Under such a situation, hitherto, there have been developed a variety of attempts to accommodate a control unit in the elevator path without establishing the elevator's machine room in order to provide a compact elevator apparatus. For example, Japanese Patent No. 2593288 discloses a traction sheave elevator, as shown in FIG. 1. In the figure, a flattened driving mechanism 2 having a traction sheave 1 is disposed between a side wall 3a in an elevator path 3 and a space defined by projected planes of an elevator car 4 in the upward and downward directions. A hoisting (suspension) rope 7 is wound about a sheave 5a beneath the car 4 and a sheave 5b above a balance weight 6, while both ends of the hoisting rope 7 are fixed on a top wall 3b defining the elevator path 3. Note, according to the arrangement shown in FIG. 1, a pit 3c in the elevator path 3 is positioned under a level 3d of the first floor (1F).
The elevator of FIG. 1 does adopt a structure where the car 4 is driven like a movable pulley while winding the suspension rope 7 about the sheave 5a under the car 4. Owing to this arrangement, it is possible to reduce the capacity of a motor of the driving mechanism relatively and minimize a space occupied by the driving mechanism, together with the effective use of the space above the car 4.
Japanese Unexamined Patent Publication (kokai) No. 9-156855 discloses another elevator apparatus shown in FIG. 2. In the apparatus, the flattened driving mechanism 2 is arranged in the upper space of the balance weight 6 and adapted so as to suspend the car 4 through turning sheaves 8a, 8b and 8c.
In this way, since the driving mechanism 2 having the traction sheave 1 is disposed between a side wall 3a in an elevator path 3 and a space defined by projected planes of an elevator car 4 in the upward and downward directions, the arrangement allows to minimize a space that the whole apparatus does occupy without providing the machine room on the roof, so that the elevator apparatus can be provided while exhibiting high efficiency in utilizing the space.
wherein the suspension rope is wound round the turning sheaves on both elevator car and balance weight,:while both ends of the suspension rope are connected to supporting members mounted on an upper end of the elevator path.
According to the embodiment, a pair of elevator guide rails 9a, 9b each having a T-shaped cross section are attached to the side walls 3a defining the elevator path 3 through not-shown brackets . On the left side of the floor 4a of the elevator car 4, a hitch part 4b is formed so as to laterally project at a position below the roof 4c of the car 4. The hitch part 4b is connected to one end of the suspension rope 7 through a not-shown hitch spring.
The “flat and thin” type of driving mechanism 2 is secured on the top of the guide rail 9a and provided with the traction sheave 1. In plan view of FIG. 4, the traction sheave 1 is accommodated in a clearance defined between the side wall 3a of the elevator path 3 and a space occupied by the elevator car 4 traveling up and down in the elevator path 3. The suspension rope 7 is wound round the traction sheave 1. Adjacent to the elevator guide rail 9a for the elevator car 4, a pair of weight guide rails 10a, 10b are arranged for guidance of the movement of the balance weight 6. The other end of the suspension rope 7 is connected to the upper end of the balance weight 6.
In the above-constructed elevator apparatus, owing to the rotational operation of the traction sheave 1 associated with the driving mechanism 2, both elevator car 4 and balance weight 6, which are coupled to the respective ends of the suspension rope 7, are moved up and down under the guidance of the guide rails 9a, 9b and 10a, 10b, respectively.
As to this movement, when the elevator car 4 is elevated, then the car roof 4c is capable of rising in excess of the height of the driving mechanism 2 owing to the arrangement where the elevator car 4 is connected to the suspension rope 7 at the hitch part 4b below the car roof 4c.
Thus, as mentioned above, since the elevator apparatus of the first embodiment is constructed with the roping ratio of 1:1, both elevator car 4 and suspension rope 7 are driven at the same velocity thereby to realize the high-speed operation. Additionally, since the driving unit consisting of the traction sheave 1 and the driving mechanism 2 are accommodated in the clearance defined between the side wall 3a of the elevator path 3 and the space being occupied by the car 4 in the process of moving upward and downward, the car 4 can rise to the vicinity of the ceiling of the elevator path 3, so that it is possible to hold the height of the elevator path 3 to a minimum, thereby accomplishing the space-saving of the apparatus.
In the elevator apparatus of the second embodiment, as shown in FIG. 3 or FIG. 4, the flat and thin driving unit at the top of the rail 9a of T-shaped cross section is constituted by driving mechanisms 2A, 2B which are arranged in either vertical (FIG. 5) or horizontal (FIG. 6) direction of the apparatus, for driving traction sheaves 1A, 1B, respectively.
In FIG. 5, the suspension rope 7 having one end connected to the lower balance weight 6 is wound around the upper half periphery of the upper traction sheave 1A and the sequent lower half periphery of the lower traction sheave 1B. Thereafter, through the upper half periphery of the upper traction sheave 1A again, the rope 7 is hung downwardly and finally connected to the hitch part 4b on the underside of the elevator car 4. According to this arrangement, with the requirement of twice windings on the upper traction sheave 1A, a groove width of the sheave 1A is twice as large as the groove width of the lower traction sheave 1B. Furthermore, the suspension rope 7 is twice wound around the upper half periphery of the upper traction sheave 1A in FIG. 5. Therefore, it means that the suspension rope 7 is connected to the balance weight 6 and the elevator car 4 through the winding of three quarters on the upper and lower sheaves 1A, 1B in total after all. The same thing can be said of the arrangement shown in FIG. 6.
Although the guide rails 9a, 9b are formed to have T-shaped cross sections in both first and second embodiments, the guide rail 9a on one hand may be formed to have a H-shaped cross section in order to improve its rigidity in the modification. Then, it will be expected to provide the elevator apparatus capable of traveling more stable.
According to the embodiment shown in FIG. 7, one of the guide rails 9a and 9c, i.e. the guide rail 9c is formed to have a H-shaped cross section, which is largely shown in FIG. 8, too. The guide rail 9c is fixed on the side wall 3a of the elevator path 3 by a not-shown bracket in a manner that parallel sides of the rail 9c oppose the elevator car 4.
The flat and thin driving mechanism 2 having the traction sheave 1 is arranged on the top of the guide rail 9c and accommodated in the clearance defined between the side wall 3a of the elevator path 3 and the occupied space by the car 4 in the process of moving upward and downward.
Additionally, a L-shaped frame 11 is provided for carrying and supporting the car 4 at the center of gravity. The frame 11 is composed of a vertical beam 11a and a horizontal beam 11b. Respectively attached on the upper and lower sides of the vertical beam 11a are upper and lower guide roller assemblies 12a, 12b each of which has a plurality of rollers 12aa, 12ab guiding one (9ca) of parallel side portions of the guide rail 9c. As largely shown in FIG. 8, at each of the guide roller assemblies 12a, 12b, the side portion 9ca close to the elevator car 4 is interposed between the roller 12aa and the accompanying roller 12aa and also interposed between the roller 12ab and the accompanying roller 12ab, on both sides of the portion 9ca.
Also, the horizontal beam 11b of the frame 11 is provided, at a tip thereof, with a roller assembly 12c which guides the movement of the elevator car 4 along the T-shaped cross-sectional guide rail 9a, as similar to the aforementioned embodiments.
Although the guide rails 10a, 10b for the balance weight 6 are not shown in FIGS. 7 and 8, the rails 10a, 10b are disposed adjacent to the guide rail 9c for the elevator car 4. Similarly, the suspension rope 7 having one end coupled to the top of the balance weight 6 and the other end coupled to the hitch part 4b below the L-shaped frame 11, is wound about the traction sheave 1.
In the above-constructed arrangement of the third embodiment, the elevator car 4 is guided by the upper and lower roller assemblies 12a, 12b while being supported by the vertical beam 11a. Then, the elevator's rolling about the longitudinal axis of the guide rail 9c can be restricted by the rollers 12aa, 12ab urging the side portion 9ca from the inside and outside.
Additionally, as to the elevator's pitching, the elevator car 4 can be restricted from being swung back and forth owing to the guidance of the guide roller assembly 12c at the tip of the horizontal beam 11b while interposing the guide rail 9a, so that the stable rise and fall can be accomplished.
In this way, according to the third embodiment, it is possible to provide the space-saving and high-speed elevator apparatus without forming the exclusive machine room on the roof of the building, as similar to the first and second embodiments. Additionally, owing to the adoption of the guide rail 9c of H-shaped cross section exhibiting a high rigidity, it is possible to realize the stable rise and fall of the elevator car 4.
Moreover, owing to the transverse beam 11b of the frame 11, the elevator car 4 can be carried with the simple structure, lightly and persistently.
That is, in FIGS. 9 and 10, the flat and thin driving mechanism 2 coupled to the traction sheave 1 is attached to either one of the guide rails 9a, 9b for guiding the elevator car 4 and accommodated in the space between the car 4 and the side wall 3a of the elevator path 3, as similar to the first to third embodiments.
Thus, at the top of the guide rail 9a, two sheaves 8d, 8e are arranged in parallel with both sides of the elevator car 4. Additionally, in position of the elevator path 3 besides the occupied space by the car 4 in the process of moving upward and downward, one sheave 8f is arranged so as to cross the sheaves 8d, 8e at an angle of 45 degrees.
On the lower side of the car 4, pitch parts 4ba, 4bb for connection with the suspension rope 7 are arranged symmetrically with each other about the gravity center of the elevator car 4. Further, the sheaves 8d, 8g corresponding to the hitch parts 4ba, 4bb are attached on the side walls 3a defining the elevator path 3 so as not to interfere with the occupied space by the car 4 in the process of moving upward and downward.
Therefore, two suspension ropes 7 each having one end coupled to the balance weight 6 are wound round the traction sheave 1 through the sheave 8e attached to the top wall 3b above the weight 6 and thereafter, divided into different directions, i.e. two courses.
Either of the so-divided suspension ropes 7 has one end connected with the elevator car 4 at the hitch part 4ba through the intermediary of the sheave 8d attached on the wall 3a. While, another suspension rope 7 has one end connected with the elevator car 4 at the hitch part 4bb through the intermediary of the sheave 8f attached on the side wall 3a at an angle of approx. 45 degrees and the sequent sheave 8g also attached on the right side wall 3a at an angle of approx. 45 degrees.
In the above-constructed fourth embodiment, owing to the drive of the driving-mechanism 2, the suspension ropes 7 divided into two routes operate to rise and fall the elevator car 4 via the sheaves 8d, 8f, 8g on one hand and the balance weight 6 via the sheave 8e on the other hand.
Thus, according to the fourth embodiment, the elevator car 4 can rise and fall at high speed equal to that of the suspension rope 7 due to the roping ratio of 1:1. Furthermore, since both sides of the elevator car 4 in the diagonal direction are being suspended by the suspension ropes 7 of two routes during the traveling, the car's posture can be stabilized. Again, owing to the arrangement where the driving unit and the respective sheaves 8d, 8e, 8f, 8g are arranged so as not to interfere with the occupied space by the car 4 in the process of moving upward and downward, it is possible to elevate the elevator car 4 so that the roof 4c reaches the vicinity of the roof wall of the elevator path 3, whereby the elevator apparatus including the elevator path 3 can be small-sized with the improvement of efficiency in using the elevator path 3.
According to the embodiment, there are provided a pair of driving mechanisms 2A, 2B connected to traction sheaves 1A, 1B, in the vicinity of the respective tops of the guide rails 9a, 9b for guiding the car 4, respectively. Guide rails 10aa, 10ba for a balance weight 6A are arranged adjacent to the guide rail 9a. Similarly, guide rails 10ab, 10bb for another balance weight 6B are arranged adjacent to the guide rail 9b. On the left and right sides of the elevator car 4, hitch parts 4ba, 4bb are attached to the car 4, symmetrically with each other. Suspension ropes 7A, 7B having respective ends coupled to the hitch parts 4ba, 4bb are wound round the traction sheaves 1A, 1B and finally connected to the balance weights 6A, 6B, respectively.
According to the embodiment, there are provided the driving mechanisms 2A, 2B which have the traction sheaves 1A, 1B arranged in the vicinity of the guide rails 9a, 9b, respectively. In the rear part of the elevator path 3 between the guide rails 9a and 9b, the common balance weight 6 is adapted so as to rise and fall under the guidance of the rails 10a, 10b.
On the left and right sides of the car 4, the suspension ropes 7A, 7B respectively connected to the hitch parts 4ba, 4bb below the car roof 4c are wound round the traction sheaves 1A, 1B, respectively and the ropes 7A, 7B are coupled to the common balance weight 6 finally.
Also in this embodiment, the left and right driving mechanisms 2A, 2B are controlled by the single control unit, so that the elevator car 4 can rise and fall owing to the mechanisms' synchronous operation at the same speed. Again, the elevator car 4 does rise and fall at speed equal to those of the suspension ropes 7A, 7B owing to the thrust force by the driving mechanisms 2A, 2B. As similar to the first to fifth embodiments, since the driving unit and the sheaves 8ha, 6hb, 8ia, 8ib are arranged so as not to interfere with the occupied space by the car 4 in the process of moving upward and downward, it is possible to reduce the height of the elevator path 3 to a minimum.
It should be noted that, in common with the first to sixth embodiments of the invention, the driving unit is attached on either one of the top of the guide rail 9a and the wall of the elevator path 3 and also arranged so as not to interfere with the occupied space by the car 4 in the process of moving upward and downward. In the modification, the driving unit may be arranged in the elevator path 3 adjacent to the first floor, provided that the driving unit does not interfere with the occupied space by the car 4 in the process of moving upward and downward.
Note, in case of fixing the driving unit etc. on the guide rail, then the attachment and fixing work can be facilitated but applying loads on the guide rail. On the contrary, in case of attaching the driving unit on the wall of the elevator path 3, then the arrangement: would have the advantage of applying no load on the guide rail.
From the above point of view, we now describe the seventh embodiment where the driving unit 2 is disposed in the pit 3c of the elevator path 3, with reference to FIG. 15.
As shown in the figure, the driving unit consisting of the traction sheave and the driving mechanism 2 is arranged in the pit 3c of the elevator path 3. One end of the suspension rope 7 wound about the traction sheave 1 is connected to the hitch part 4b through a sheave 8j in the vicinity of the roof of the elevator path 3, while the other end of the rope 7 is connected to the balance weight 6 through a sheave 8k in the vicinity of the roof of the elevator path 3.
Note, although the shown embodiment does adopt the single driving mechanism 2, for example, it may be replaced with a pair of driving units in the pit 3c for realizing the large-capacity, as similar to the units shown in FIGS. 11 to 13.
FIGS. 16 and 17 show the eighth embodiment of the invention. According to this embodiment, an elevator car 21 is guided by two parallel guide rails 20a, 20b mounted on side walls 24a of an elevator path (hoistway) 24 through not-shown brackets. A turning sheave 22 is attached on a side face 21a of the elevator car 21, namely, either one of the left and right faces on both sides of a front face 21b as the entrance for the elevator car 21 so that a rotational plane of the sheave 22 is parallel with the side face 21a. A suspension rope 23 is wound round the turning sheave 22, while the elevator car 21 is suspended by the suspension rope 23 through the turning sheave 22.
Fixed on the top of the guide rail 20a on the side of the turning sheave 22 is a driving unit 26 which drives to rotate a flat and thin traction sheave 25 disposed between the side wall 24a of the elevator path 24 and the space being occupied by the rising and falling elevator car 21. The suspension rope 23 is wound round the traction sheave 25 and also wound or rewound in a “well bucket” manner by the rotation of the traction sheave 25.
A pair of guide rails 27a, 27b for balance weight are arranged in a position adjacent to the guide rail 20a, for allowing a balance weight 28 to rise and fall under their guidance. Attached on the top of the balance weight 28 is a turning sheave 29 about which the suspension rope 23 is also wound to hang the weight 28. Both ends of the suspension rope 23 are connected to supporting members (not shown) and carried by the members, which are built in the ceiling of the elevator path 24 over the elevator car 21, through the intermediary of hitch springs also not shown in the figure.
The elevator apparatus of the first embodiment operates as follows. With the drive of the driving unit 26, the traction sheave 25 is rotated and therefore, the suspension rope 23 rolled thereon is wound up and rewound, so that the elevator car 21 and balance weight 28 rise and fall in opposite directions, under the guidance of the guide rails 20a, 20b; 27a, 27b, respectively. Then, since the elevator car 21 is suspended by the suspension rope 23 through the turning sheave 22 disposed on the side face 21a under a ceiling (roof) face 21c, the elevator car 21 can be elevated in a manner that the ceiling face 21c moves upward in excess of the driving unit 26 in the elevator path 24.
Thus, according to the embodiment, since the elevator car 21 hung by the suspension rope 23 performs an action like a moving pulley due to the turning sheave 22, it is possible to reduce the power capacity required for the driving unit 26 in comparison with that required for the driving unit 26 in direct-hanging the car 21 by the traction sheave 25. Repeatedly since the driving unit 26 is arranged in a space in the elevator path 24, between the side wall 24a of the elevator path 24 and the space being occupied by the rising and falling elevator car 21 and additionally, the elevator car 21 can rise and fall close to the ceiling and floor of the elevator path 24 without requiring any more space above or beneath the path 24, it is possible to establish a height of the path 24 to a minimum.
The ninth embodiment will be described below, with reference to FIGS. 18 and 19. The ninth embodiment is differentiated from the eighth embodiment in that a balance weight 28 is guided by the guide rails 27a, 27b provided on a back wall 24 of the elevator path 24, for the weight's free elevation and that the elevator car 21 is provided, on a back face 21d thereof, with the turning sheave 22. Further, the elevator apparatus in accordance with the ninth embodiment is characterized in that the flat and thin driving unit 26 is mounted on the guide rail 27a for the balance weight and the traction sheave is positioned in the clearance between the back wall 24b of the elevator path 24 and the space being occupied by the moving elevator car 21. The other structure of the ninth embodiment is similar to that of the eighth embodiment of FIGS. 16 and 17 and therefore, the elements similar to those of the eighth embodiment are indicated with the same references, respectively.
According to the embodiment, a pair of bilaterally symmetrical turning sheaves 22a, 22b are respectively attached on the side faces 21a, 21e of the elevator car 21, which is guided by the guide rails 20a, 20b secured on the side walls of the elevator path 24 through not-shown brackets, and furthermore, the elevator car 21 is provided, on the underside of a floor face 21f, with turning sheaves 22c, 22d having respective rotating planes parallel with the floor face 21f. The suspension rope 23 is wound round these turning sheaves 22a to 22d. Adjacent to the guide rail 20b, a pair of guide rails 27a, 27b are fixed on the side wall of the elevator path 24, for guiding the rise and fall of the balance weight 28. Note, the balance weight 28 is provided, at a top thereof, with a turning sheave 29.
In case of this embodiment, the driving unit 26 is mounted on the top of the guide rail 20b, while the traction sheave 25 is positioned in the clearance between the side wall of the elevator path 24 and the space being occupied by the moving elevator car 21.
In arrangement, the suspension rope 23 is wound round the traction sheave 25, the turning sheaves 22a, 22b on the side faces 21a, 21e of the car 21, the turning sheaves 22c, 22d on the bottom face and the turning sheave 29 for the balance weight 28 in order. While, both ends of the rope 23 are connected to the supporting members (not shown) on the ceiling above the elevator path 24 through the hitch springs (also not shown).
In the elevator apparatus of the embodiment, by driving the driving unit 26, the suspension rope 23 is driven by the engagement of the traction sheave 25 with the unit 26, so that the elevator car 21 and the balance weight 28 suspended by the suspension rope 23 rise and fall in opposite directions under the guidance of the guide rails 20a, 20b; 27a, 27b, respectively. Then, since the elevator car 21 is suspended by the suspension rope 23 through the turning sheave 22a, 22b disposed on the side faces 21a, 21e under the ceiling face 21c, the elevator car 21 can be elevated in a manner that the ceiling face 21c moves upward in excess of the driving unit 26 in the elevator path 24.
Thus, according to the embodiment, since the elevator car 21 hung by the suspension rope 23 also performs an action like a moving pulley, it is possible to reduce the power capacity required for the driving unit 26. Repeatedly since the driving unit 26 having the traction sheave 25 is arranged in a space in the elevator path 24, between the side wall 24a of the elevator path 24 and the space being occupied by the rising and falling elevator car 21 and additionally, the elevator car 21 can rise and fall close to the ceiling and floor of the elevator path 24 without requiring any more space above or beneath the path 24, it is possible to establish the height of the path 24 to a minimum. Furthermore, the elevator apparatus of the embodiment has the advantage of freely establishing the positions of the turning sheaves 22a, 22b attached on the side faces 21a, 21e of the elevator 21 respectively, together with the positions of the accompanying turning sheaves 22c, 22d on the floor face 21f.
Referring to FIG. 21, we now describe the elevator apparatus in accordance with the eleventh embodiment. The eleventh embodiment is characterized by the arrangement where the turning sheaves are disposed on both side faces 21a, 21e and the ceiling face 21c so as to be vertically opposite to the arrangement of the tenth embodiment. In detail, the turning sheaves 22e, 22f are arranged in the vicinity of the respective centers of the left and right side faces 21a, 21e of the car 21, while the turning sheaves 22g, 22h are arranged in the vicinity of the upper edges of the left and right side faces 21a, 21e. Further, in the vicinity of left and right ends of the ceiling face 21c, the turning sheaves 22i, 22j are attached to the ceiling face 21c so that the rotating planes are parallel with the ceiling face 21c. As to the mutual arrangement of the balance weight 28, the driving unit 26 and the traction sheave 25, this embodiment is similar to the previously-mentioned tenth embodiment.
Also in this embodiment, since the elevator car 21 hung by the suspension rope 23 also performs an action like a moving pulley, it is possible to reduce the power capacity required for the driving unit 26. Repeatedly since the driving unit 26 having the traction sheave 25 is arranged in a space in the elevator path 24, between the side wall 24a of the elevator path 24 and the space being occupied by the rising and falling elevator car 21 and additionally, the elevator car 21 can rise and fall close to the ceiling and floor of the elevator path 24 without requiring any more space above or beneath the path 24, it is possible to establish the height of the path 24 to a minimum. Furthermore, the elevator apparatus of the embodiment has the advantage of freely establishing the positions of the turning sheaves 22e, 22f, 22g, 22h attached on the side faces 21a, 21e of the elevator 21 respectively, together with the positions of the accompanying turning sheaves 22i, 22j on the ceiling face 21c.
Referring to FIGS. 22 and 23, we now describe the elevator apparatus in accordance with the twelfth embodiment. The twelfth embodiment is characterized by the arrangement where turning sheaves 22k and 22l in place of the above turning sheaves 22i, 22j in the eleventh embodiment of FIG. 21 are disposed on the back face 21d. Further, positioned in the clearance between the back wall of the elevator path 24 and the space being occupied by the rising and falling elevator car 21 are not only the driving unit 26 and the traction sheave 25 but the elevating balance weight 28.
Also in this embodiment, it is possible to reduce the power capacity required for the driving unit 26, as similar to the eleventh embodiment. Repeatedly, the driving unit 26 having the traction sheave 25 is arranged in the clearance defined between the back wall of the elevator path 24 and the space being occupied by the rising and falling elevator car 21. Additionally, the elevator car 21 can rise and fall close to the ceiling and floor of the elevator path 24 without requiring any more space above or beneath the path 24. Therefore, it is possible to establish the height of the path 24 to a minimum. Furthermore, the elevator apparatus of the embodiment has the advantage of freely establishing the positions of the turning sheaves 22e, 22f, 22g, 22h attached on the side faces 21a, 21e of the elevator car 21 respectively, together with the positions of the accompanying turning sheaves 22k, 22l on the back face 21d.
Referring to FIGS. 24 and 25, we now describe the elevator apparatus in accordance with the thirteenth embodiment. According to the embodiment, the elevator car 21 has a turning sheave 22m attached to the side face 21a on the right side in the view from the front side, a turning sheave 22n attached to the back face 21d, and a turning sheave 22o attached on the floor face 21f, for rotating in a rotational plane in parallel with the face 21f. Further, the driving unit 26 and the traction sheave 25 are positioned in the clearance defined between the back wall of the elevator path 24 and the space being occupied by the rising and falling elevator car 21. Similarly, the elevating balance weight 28 is arranged so as to rise and fall in the same clearance. The suspension rope 23 is wound round the turning sheaves 22m, 22n, 22o, the turning sheave 29 for the balance weight 28 and the traction sheave 25, so that both ends of the rope 23 are connected to the supporting members (not shown) on the ceiling of the elevator path 24.
Also in the thirteenth embodiment, it is possible to reduce the power capacity required for the driving unit 26, as similar to the previous embodiments. Repeatedly, since the driving unit 26 having the traction sheave 25 is arranged in the clearance defined between the back wall of the elevator path 24 and the space being occupied by the rising and falling elevator car 21, it is possible to establish the height of the path 24 to a minimum. Furthermore, the elevator apparatus of the embodiment has the advantage of freely establishing the positions of the turning sheaves 22m, 22n, 22o which are attached on the respective faces 21a, 21d, 21f of the elevator car 21, respectively.
Referring to FIG. 26, we now describe the elevator apparatus in accordance with the fourteenth embodiment. In place of the turning sheaves 22g, 22h on the side faces 21a, 21e and the turning sheaves 22k, 22l on the back faces 21d of the twelfth embodiment shown in FIGS. 22 and 23, the twelfth embodiment is characterized by the arrangement where turning sheaves 22p, 22q are attached on both sides of the ceiling face 21c so that the rotating planes of the sheaves 22p, 22q are identical to substantially-vertical planes on both sides of the car 21, while the suspension rope 23 is wound round the turning sheaves 22e, 22f, 22p, 22q and the turning sheave 29 on the top of the balance weight 28.
Referring to FIG. 27, we now describe the elevator apparatus in accordance with the fifteenth embodiment. In place of the driving unit 26 of FIG. 16, the fifteenth embodiment is characterized by the adoption of a plurality of driving units 26a, 26b to be operated synchronously. That is, the driving units 26a, 26b respectively including the traction sheaves 25a, 25b are mounted on the upper end of the guide rail 20b, for winding or rewinding the sheaves 25a, 25b synchronously.
The suspension rope 23 is wound round the turning sheave 29 on the balance weight 28, while one end 23a of the rope 23 is connected to the ceiling of the elevator path 24. By way of an upper half periphery of the upper traction sheave 25a, a lower half periphery of the lower traction sheave 25b, the upper half periphery of the upper traction sheave 25a again and the turning sheave 22 on the side face 21e of the car 21 in order, the other end 23b of the rope 23 is finally connected to the ceiling of the elevator path 24. With the above-mentioned wiring, it is possible to equally wind the suspension rope 23 about two traction sheaves 25a, 25b by three quarters of the whole periphery of each sheave. Note, the upper traction sheave 25a is provided, for receiving the suspension rope 23, with a groove whose width is twice as large as that of the lower traction sheave 25b.
According to the fifteenth embodiment of the invention, since the driving units 26a, 26b operate to wind the suspension rope 23, it is possible to double the thrust for driving the elevator car 21 thereby to cope with the driving of a large capacity of elevator car 21.
In connection, the driving units 26a, 26b may be arranged horizontally, as shown in the modification of FIG. 28. In this case, the suspension rope 23 is successively brought to the upper part (one fourth of the whole periphery) of the front traction sheave 25a from the underside, the sequential rear half round of the rear traction sheave 25b, the half round of the front traction sheave 25a from the underside again and the upper part (one fourth of the whole periphery) of the rear traction sheave 25b again and thereafter, to the downside. Finally, the rope 23 is wound round the turning sheave 22 on the side face 21e of the car 21. In this way, it is possible to equally wind the suspension rope 23 about two traction sheaves 25a, 25b by three quarters of the whole periphery of each sheave.
Referring to FIGS. 29 and 30, we now describe the elevator apparatus in accordance with the sixteenth embodiment. In case of the tenth to fourteenth embodiments where the turning sheaves are mounted on both side faces 21a, 21e of the elevator car 21 or the side faces 21a, 21e and the back face 21d or the roof face 21c, the turning sheaves 22a to 22d may be arranged in symmetry about the gravity center G of the car 21, as shown with the symmetrical arrangement (of 180 degrees) of FIG. 29, representatively.
Additionally, even when the turning sheaves 22m, 22n, 22o are attached on the side faces 21a, 21d and the bottom face 21f respectively, the turning sheaves may be symmetrically arranged with respect to the gravity center G of the elevator car 21, for example, as shown with the symmetrical arrangement (of 90 degrees) of FIG. 30.
With the symmetrical arrangement, it is possible to suspend the elevator car 21 in a manner to interpose the gravity center G. Thus, it is possible to prevent an excessive bias load from acting on the guide rails 20a, 20b, whereby the stable rise and fall can be accomplished.
at least one driving unit for rotating a traction sheave about which the suspension rope is wound; wherein
the driving unit and the balance weight are together arranged on one lateral side of the elevator car and also positioned in a clearance between an inner wall of the elevator path and a space occupied by the elevator car rising and falling in the elevator path, and the driving unit is directly secured to one of the elevator guide rails;
the driving unit is constructed so as to become thin;
the traction sheave is arranged so as to have its rotating axis substantially perpendicular to the inner wall of the elevator path defining the clearance; and
the end of the suspension rope is fixed to the elevator car in a position below a ceiling of the elevator car.
2. An elevator apparatus as claimed in claim 1,
3. An elevator apparatus as claimed in claim 2, wherein the driving mechanisms are arranged up and down in the elevator path, while the suspension rope is wound round the traction sheave associated with the upper driving mechanism with a plurality of turns.
78829 June 1868 Reedy
170087 November 1875 Howard
0 539 238 April 1993 EP
0 688 735 December 1995 EP
0 719 724 July 1996 EP
0 749 931 December 1996 EP
0 779 233 June 1997 EP
1-256487 October 1989 JP
7-117957 May 1995 JP
07 117957 May 1995 JP
08 175623 July 1996 JP
9-124259 May 1997 JP
10-008755 January 1998 JP
10 087240 April 1998 JP
97/11020 March 1997 WO
Patent Publication Number: 20010009211
Application Number: 09/816,221
Current U.S. Class: And Rotatably Driven Drum Pulling Thereon (187/254); Plural Driven Drums (187/256); Having Specific Force Transmitting Connection For Counterweight Or Load Support (187/411)