CA2049422C - Support frame for a rope brake and hoist system - Google Patents
Support frame for a rope brake and hoist systemInfo
- Publication number
- CA2049422C CA2049422C CA 2049422 CA2049422A CA2049422C CA 2049422 C CA2049422 C CA 2049422C CA 2049422 CA2049422 CA 2049422 CA 2049422 A CA2049422 A CA 2049422A CA 2049422 C CA2049422 C CA 2049422C
- Authority
- CA
- Canada
- Prior art keywords
- hoist
- elevator
- frame
- hoist rope
- rope brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/0035—Arrangement of driving gear, e.g. location or support
- B66B11/004—Arrangement of driving gear, e.g. location or support in the machine room
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
- B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
- B66B5/185—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces by acting on main ropes or main cables
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method and apparatus are disclosed for the retrofit installation of an auxiliary hoist rope brake on an existing elevator hoist system. The apparatus includes a frame which supports the existing elevator hoist in an elevated position with respect to its original foundation, and which supports the hoist rope brake in operative relation to the elevator hoist ropes.
A method and apparatus are disclosed for the retrofit installation of an auxiliary hoist rope brake on an existing elevator hoist system. The apparatus includes a frame which supports the existing elevator hoist in an elevated position with respect to its original foundation, and which supports the hoist rope brake in operative relation to the elevator hoist ropes.
Description
204~42?
The present invention relates to elevator safety systems in general, and in particular to a retrofitable frame for mounting an auxiliary hoist rope brake onto an existing elevator hoisting system.
Elevator hoisting systems are typically provided with various means for braking the motion o~E the elevator car and counterweight. Occasionally, a hoisting machine braking system fails causing the hoisting system to overspeed. For example, some hoisting machines rely upon a frictionally engag~ng electrical/mechanical brake fastened into the worm shaft, between the motor and the gearbox assembly. Should the worm shaft experience structural failure at a point between the electrical/mechanical brake and the gearbox assembly, a freely running elevakor car occur5. This is congidered a total ~ailure of the car susp~nsion system.
It i9 apparent that other posslble braking system failures from the one mentioned above could similarly lead to a catastrophic failure of the car suspension system.
In response to this eventuality, there are available braking systems which operate by frictionally engaginy the hoist ropes directly. A typical example of this type of hoist rope brake is one manufactured by Bode Elevator Equipment Ltd.. Hoist rope braking systems of this type can be adapted to operate as a secondary safety brake, thereby providing an additional level of protection against catastrophic failure of a car suspension. However, because of space limitations, it is often impractical to direatly mount these hoist rope brakes, as a retrofit, onto existing elevator hoisting systems.
It is therefore an object of the present invention to provide a retrofitable frame for supporting an existing elevator hoist system and an auxilliary hoist rope brake on an existing elevator hoist system.
~ B :~
... ..
~ " ~ ' 20~q422 According to an aspect of the invention there is provided a xetrofitable frame for operatively supporting an existing elevator hoist system and an auxiliary hoist rope brake above a floor structure at the top of an elevator shaft and readily accessible for maintenance, said elevator hoist system having a hoist rope sheave driven by an electric motor through a transmission system and said auxiliary hoist rope brake being adapted to operate on elevator hoist ropes suspended from said hoist rope sheave, said retro~itable frame comprising: an upper mounting surface for securely supporting said elevator hoist system on top of said retrofitable frame, said upper mounting surface having a substantially level orientation and being provided with openings for the passage therethrough of elevator hoist ropes; first and second lower mounting members for securely supporting said au~iliary hoist rope brake in operative relation to said elevator holst ropes, said lower mounting members having a substantlally ver~ical orientation proximal to said elevator hoist ropes suspended from said hoist rope sheave; and at least two substantially vertical supporting members adapted to support said upper surface and said first and second lower mounting members at respective predetermined heights above said floor structure.
The support frame is preferably fabricated from standard structural skeel members which are fastened together by welding and/or bolting. Preferably, the frame is at least partially fabricatQd in a suitable metal~working shop to ensure proper alignment o~ the ~rame elements, with final assembly being conducted on site. Furthermore, the ~rame is preferably desi~ned to permit easy removal of the entire hoisting and braking system following installation, ~or example to facilitate maintenance or repair.
The preferred embodiments of the invention are described, with reference to the appended drawing, in which:
Figure 1 shows a perspective view of an embodiment of the support frame according to the invention.
B
2049~22 ::
Referring to Figure 1, a typical elevator hoisting system 1 comprises an electric motor 2 coupl~d to a hoist rope drive sheave 3 via a gear box, worm gear, and brake assembly 4. Hoisting ropes 5 pass around the hoist rope drive sheave 3 and down through rope passages 6a and 6b into the elevator shaft. One end of the each of the hoist ropes 5 is connected to an elevator car (not shown), and the other is connected to a counterweight (also not shown). During nor~al operation the motor 2 drives the hoist rope sheave 3 in forward and reverse directions so as to alternately raise and lower the elevator car and counterweight. Obviously existing hoisting systems and their type o~ electric motor will vary according to different manufactured models installed, including models requiring deflector sheaves.
In order to provide additional protection against po~ible total ~ailure o~ tho car suspension system, a hoist rope brake 7 is mounted so that, upon activation, the hoist ropes 5 are ~rictionally engaged directly, thereby stopping the elevator car. The hoist rope brake 7 may, for example, be of a type maufactured by Bode Elevator Equipment Ltd.. In order to facilitate installation of the auxiliary brake 7, the hoisting system 1 is mounted on a support frame 8. The support frame 8 comprises two parallel foundation beams 9, supported by vertical legs 10, and connected together by cross-ties 11. The foundation beams 9 serve as a foundation for the hoisting system 1, and are spaced apart appropriately to facilitate mounting of the hoisting system 1 thereon without the need to modify the existing hoisting system mounting arrangements. The vertical legs 10 and cross-ties 11 are appropriately sized to hold the foundation beams 9 parallel and level. The foundation beams 9, legs 10, and croæs-ties 11 are composed of standard structural steel sections which are appropriately selected (and fastened together) so as to withstand all anticipated loads in accordance with applicable codes and standards.
,' :.;'..
i' ~3 `
20~422 In addition, the support frame 8 comprises a hoist rope brake bracket 12 which is adapted to securely hold the hoist rope brake 7 in operative relation to the hoist ropes 5. As with the remainder of the support frame 8, the hoist rope brake bracket 12 is constructed of standard structural steel sections suitably selected ~and fast:ened together) so as to be able to withstand all anticipated loads in accordance with applicable codes and standards.
The support frame 8 is suitably anchored to the floor structure ~by means known in the art, such as anchor bolts) to prevent movement, including uplift, or toppling thereof.
.
In order to mount the hoist rope brake 7 onto the hoisting system 1, there is provided according to thc invention the ~ollowing process:
1) Power supply to the existing elevator hoisting system is disconnected;
The present invention relates to elevator safety systems in general, and in particular to a retrofitable frame for mounting an auxiliary hoist rope brake onto an existing elevator hoisting system.
Elevator hoisting systems are typically provided with various means for braking the motion o~E the elevator car and counterweight. Occasionally, a hoisting machine braking system fails causing the hoisting system to overspeed. For example, some hoisting machines rely upon a frictionally engag~ng electrical/mechanical brake fastened into the worm shaft, between the motor and the gearbox assembly. Should the worm shaft experience structural failure at a point between the electrical/mechanical brake and the gearbox assembly, a freely running elevakor car occur5. This is congidered a total ~ailure of the car susp~nsion system.
It i9 apparent that other posslble braking system failures from the one mentioned above could similarly lead to a catastrophic failure of the car suspension system.
In response to this eventuality, there are available braking systems which operate by frictionally engaginy the hoist ropes directly. A typical example of this type of hoist rope brake is one manufactured by Bode Elevator Equipment Ltd.. Hoist rope braking systems of this type can be adapted to operate as a secondary safety brake, thereby providing an additional level of protection against catastrophic failure of a car suspension. However, because of space limitations, it is often impractical to direatly mount these hoist rope brakes, as a retrofit, onto existing elevator hoisting systems.
It is therefore an object of the present invention to provide a retrofitable frame for supporting an existing elevator hoist system and an auxilliary hoist rope brake on an existing elevator hoist system.
~ B :~
... ..
~ " ~ ' 20~q422 According to an aspect of the invention there is provided a xetrofitable frame for operatively supporting an existing elevator hoist system and an auxiliary hoist rope brake above a floor structure at the top of an elevator shaft and readily accessible for maintenance, said elevator hoist system having a hoist rope sheave driven by an electric motor through a transmission system and said auxiliary hoist rope brake being adapted to operate on elevator hoist ropes suspended from said hoist rope sheave, said retro~itable frame comprising: an upper mounting surface for securely supporting said elevator hoist system on top of said retrofitable frame, said upper mounting surface having a substantially level orientation and being provided with openings for the passage therethrough of elevator hoist ropes; first and second lower mounting members for securely supporting said au~iliary hoist rope brake in operative relation to said elevator holst ropes, said lower mounting members having a substantlally ver~ical orientation proximal to said elevator hoist ropes suspended from said hoist rope sheave; and at least two substantially vertical supporting members adapted to support said upper surface and said first and second lower mounting members at respective predetermined heights above said floor structure.
The support frame is preferably fabricated from standard structural skeel members which are fastened together by welding and/or bolting. Preferably, the frame is at least partially fabricatQd in a suitable metal~working shop to ensure proper alignment o~ the ~rame elements, with final assembly being conducted on site. Furthermore, the ~rame is preferably desi~ned to permit easy removal of the entire hoisting and braking system following installation, ~or example to facilitate maintenance or repair.
The preferred embodiments of the invention are described, with reference to the appended drawing, in which:
Figure 1 shows a perspective view of an embodiment of the support frame according to the invention.
B
2049~22 ::
Referring to Figure 1, a typical elevator hoisting system 1 comprises an electric motor 2 coupl~d to a hoist rope drive sheave 3 via a gear box, worm gear, and brake assembly 4. Hoisting ropes 5 pass around the hoist rope drive sheave 3 and down through rope passages 6a and 6b into the elevator shaft. One end of the each of the hoist ropes 5 is connected to an elevator car (not shown), and the other is connected to a counterweight (also not shown). During nor~al operation the motor 2 drives the hoist rope sheave 3 in forward and reverse directions so as to alternately raise and lower the elevator car and counterweight. Obviously existing hoisting systems and their type o~ electric motor will vary according to different manufactured models installed, including models requiring deflector sheaves.
In order to provide additional protection against po~ible total ~ailure o~ tho car suspension system, a hoist rope brake 7 is mounted so that, upon activation, the hoist ropes 5 are ~rictionally engaged directly, thereby stopping the elevator car. The hoist rope brake 7 may, for example, be of a type maufactured by Bode Elevator Equipment Ltd.. In order to facilitate installation of the auxiliary brake 7, the hoisting system 1 is mounted on a support frame 8. The support frame 8 comprises two parallel foundation beams 9, supported by vertical legs 10, and connected together by cross-ties 11. The foundation beams 9 serve as a foundation for the hoisting system 1, and are spaced apart appropriately to facilitate mounting of the hoisting system 1 thereon without the need to modify the existing hoisting system mounting arrangements. The vertical legs 10 and cross-ties 11 are appropriately sized to hold the foundation beams 9 parallel and level. The foundation beams 9, legs 10, and croæs-ties 11 are composed of standard structural steel sections which are appropriately selected (and fastened together) so as to withstand all anticipated loads in accordance with applicable codes and standards.
,' :.;'..
i' ~3 `
20~422 In addition, the support frame 8 comprises a hoist rope brake bracket 12 which is adapted to securely hold the hoist rope brake 7 in operative relation to the hoist ropes 5. As with the remainder of the support frame 8, the hoist rope brake bracket 12 is constructed of standard structural steel sections suitably selected ~and fast:ened together) so as to be able to withstand all anticipated loads in accordance with applicable codes and standards.
The support frame 8 is suitably anchored to the floor structure ~by means known in the art, such as anchor bolts) to prevent movement, including uplift, or toppling thereof.
.
In order to mount the hoist rope brake 7 onto the hoisting system 1, there is provided according to thc invention the ~ollowing process:
1) Power supply to the existing elevator hoisting system is disconnected;
2) The existing elevator hoist ropes 6 are removed from the hoist sheave 3, thereby permitting the hoisting system 1 to be removed from its foundation;
3) The hoist system 1 is then removed from its foundation;
4) The support frame ~ is then installed over the location where the hoist system 1 was originally installed;
5) The hoist system 1 and the auxiliary brake 7 are then mounted on the support ~rame 8, with all assoaiated syætems appropriately installed;
6) ~levator hoist ropes are then installed on the hoist sheave 3 and through the auxiliary bra]ce 7, with respective ends connected to the elevator car and the counterweight; and 7) The power supply is then aonnected to the hoisting system 1 and the auxiliary brake 7, and all systems tested.
B
.
~; '~
20~q~22 It will be apparent that the hoisting system 1, and in particular the hoisting sheave 3, will now occupy a position substantially higher than was originally the case.
In view of this, it will likely be of advantage to install new hoisting ropes which are longer than the original hoisting ropes, rather than attempting to re-install the existing hoisting ropes.
It will be further apparent that the support frame 10 will, of necessity, have to be fabricated and installed according to the applicable laws and safety standards, for example CAN/CSA-B44-M90, Sa~ety Code For Elevators.
'. ,' .~, , .. . :. , .; . : .
, ',';,;.. ..
,: ', ... .
":...,~
~ ~:B
B
.
~; '~
20~q~22 It will be apparent that the hoisting system 1, and in particular the hoisting sheave 3, will now occupy a position substantially higher than was originally the case.
In view of this, it will likely be of advantage to install new hoisting ropes which are longer than the original hoisting ropes, rather than attempting to re-install the existing hoisting ropes.
It will be further apparent that the support frame 10 will, of necessity, have to be fabricated and installed according to the applicable laws and safety standards, for example CAN/CSA-B44-M90, Sa~ety Code For Elevators.
'. ,' .~, , .. . :. , .; . : .
, ',';,;.. ..
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Claims (2)
1. A retrofitable frame for operatively supporting an existing elevator hoist system and an auxiliary hoist rope brake above a floor structure at the top of an elevator shaft and readily accessible for maintenance, said elevator hoist system having a hoist rope sheave driven by an electric motor through a transmission system and said auxiliary hoist rope brake being adapted to operate on elevator hoist ropes suspended from said hoist rope sheave, said retrofitable frame comprising:
a) an upper mounting surface for securely supporting said elevator hoist system on top of said retrofitable frame, said upper mounting surface having a substantially level orientation and being provided with openings for the passage therethrough of elevator hoist ropes;
b) first and second lower mounting members for securely supporting said auxiliary hoist rope brake in operative relation to said elevator hoist ropes, said lower mounting members having a substantially vertical orientation proximal to said elevator hoist ropes suspended from said hoist rope sheave;
c) at least two substantially vertical supporting members adapted to support said upper surface and said first and second lower mounting members at respective predetermined heights above said floor structure.
a) an upper mounting surface for securely supporting said elevator hoist system on top of said retrofitable frame, said upper mounting surface having a substantially level orientation and being provided with openings for the passage therethrough of elevator hoist ropes;
b) first and second lower mounting members for securely supporting said auxiliary hoist rope brake in operative relation to said elevator hoist ropes, said lower mounting members having a substantially vertical orientation proximal to said elevator hoist ropes suspended from said hoist rope sheave;
c) at least two substantially vertical supporting members adapted to support said upper surface and said first and second lower mounting members at respective predetermined heights above said floor structure.
2. A retrofitable frame as claimed in claim 1, wherein said elevator hoist system further includes at least one deflector sheave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2049422 CA2049422C (en) | 1991-08-16 | 1991-08-16 | Support frame for a rope brake and hoist system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2049422 CA2049422C (en) | 1991-08-16 | 1991-08-16 | Support frame for a rope brake and hoist system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2049422A1 CA2049422A1 (en) | 1993-02-17 |
| CA2049422C true CA2049422C (en) | 1993-12-21 |
Family
ID=4148201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2049422 Expired - Fee Related CA2049422C (en) | 1991-08-16 | 1991-08-16 | Support frame for a rope brake and hoist system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2049422C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG95597A1 (en) * | 1998-07-13 | 2003-04-23 | Inventio Ag | Rope traction elevator |
-
1991
- 1991-08-16 CA CA 2049422 patent/CA2049422C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2049422A1 (en) | 1993-02-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |