Elevator pit ladder system
By designing a movable ladder holding component in the elevator pit, the problem of inconvenient handling of traditional ladders is solved, enabling convenient removal of the ladder near the door opening and reducing the physical exertion and safety risks for operators.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- INVENTIO AG
- Filing Date
- 2024-12-16
- Publication Date
- 2026-07-14
Smart Images
Figure CN122396643A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to elevators, and more particularly, to an elevator pit ladder system for holding a ladder in the pit of an elevator device. Background Technology
[0002] Elevators are an essential component of multi-story buildings (e.g., commercial or residential buildings) for transporting people and goods between different floors. An elevator includes an elevator shaft that runs along multiple floors of the building. Additionally, an elevator includes an elevator car adapted to move between multiple floors along the elevator shaft using a drive unit. The elevator shaft includes an elevator pit located below the lowest floor of the building.
[0003] For routine maintenance, one or more operators are typically required to be on top of the elevator car or in the elevator pit to perform various maintenance tasks. To access the elevator pit, operators may need to use a ladder to climb down through a door opening. Traditionally, this ladder is placed on a bracket mounted on the wall of the shaft. The operator needs to reach the bracket and then lift the ladder from it. The ladder can then be placed in the elevator pit, allowing the operator to climb down through the door opening.
[0004] However, due to the weight and length of the ladder, it is difficult for operators to manually move the ladder from the support towards the door opening. Furthermore, operators need to lean into the shaft and towards the support to remove / carry the ladder from the support to the door opening. However, it is unsafe for operators to lean downwards from the door opening while holding the ladder and repositioning it from the support into the shaft. Additionally, due to the significant distance between the door opening and the support holding the ladder, it is difficult for operators to reach the support while standing at the door opening and to carry the ladder such a long distance.
[0005] WO2020258791A1 discloses an elevator pit ladder mounting device, which includes a mounting bracket, a sliding rail fixed in the elevator shaft, and a connecting device for connecting the ladder to the mounting bracket. This connecting device is adapted to rotatably connect the ladder to the mounting bracket, thereby adjusting the distance between the ladder and the elevator shaft floor entrance by rotating the ladder. However, to rotate the ladder, a technician needs to tilt into the shaft and then rotate the ladder relative to the mounting bracket. This significantly increases the physical effort or strength required for the technician to reach the ladder from the elevator pit ladder mounting device. In particular, it is difficult and inconvenient for the technician to reach the wall on which the ladder is positioned and then rotate the entire ladder while tilting into the shaft. Summary of the Invention
[0006] Therefore, there is a strong desire to develop a system that can eliminate one or more of the drawbacks associated with the aforementioned elevators.
[0007] The object of this invention is to provide an elevator pit ladder system having a ladder holding assembly for removably holding the ladder in the pit of the elevator equipment. This ladder holding assembly is adapted to bring the ladder closer to an operator near a door opening, allowing the operator to remove the ladder from the ladder holding assembly with minimal physical effort or strength and without excessive tilting. According to the invention, this object is achieved by an elevator pit ladder system having the features of claim 1 and an elevator equipment having the features of claim 16.
[0008] According to a first aspect of the present invention, an elevator pit ladder system for elevator equipment is disclosed. The elevator pit ladder system includes a ladder and a ladder holding assembly for removably holding the ladder in the pit of the elevator equipment. The ladder holding assembly includes a mounting bracket attached to or adapted to be attached to a wall of the pit. Furthermore, the ladder holding assembly includes a movable mechanism coupled to the mounting bracket. The movable mechanism includes a ladder holding device movable between a removal position and a parking position. The ladder holding device is adapted to removably hold the ladder. The movable mechanism is designed such that the ladder holding device can be moved from the parking position to the removal position, causing the ladder to move away from the mounting bracket, and wherein, when the ladder holding device is in the removal position, the ladder can be removed from the ladder holding device.
[0009] The movable mechanism may also include at least one locking element movably coupled to the mounting bracket and adapted to releasably engage with the ladder retainer to restrict movement of the ladder retainer from a parking position to a removal position, wherein the at least one locking element will be released to allow the ladder retainer to move from the parking position to the removal position, such that the ladder moves away from the mounting bracket to allow the ladder to be lifted and removed from the ladder retainer.
[0010] The parking position can be understood as the location assigned to the elevator in its normal operating mode. In the parking position, the ladder can be positioned close to the wall of the pit, thus allowing the elevator car to move unimpeded within the shaft. The ladder can be used to perform maintenance operations in the pit, allowing technicians to descend safely. The removal position can be understood as the location where the ladder can be removed. In the removal position, the ladder can be spaced apart from the wall of the pit and thus closer to the technicians, allowing technicians standing at the door opening to easily remove the ladder without having to lean into the shaft.
[0011] In a preferred embodiment, the movable mechanism of the ladder holding assembly includes a pivotable ladder holding device attached to a mounting bracket and capable of pivoting at least partially between a removed position and a parked position. The pivotable ladder holding device includes at least one arm. Therefore, the ladder holding device is a pivotable ladder holding device.
[0012] Therefore, the movable mechanism includes at least one arm capable of moving between a removal position and a parking position. The arm is adapted to hold the ladder in a removable manner. The ladder holding assembly includes at least one locking element movably coupled to a mounting bracket and adapted to releasably engage with the arm to restrict movement of the arm from the parking position to the removal position. The at least one locking element will be released to allow the arm to move from the parking position to the removal position, causing the ladder to move away from the mounting bracket to allow the ladder to be lifted from the arm and removed.
[0013] According to a second aspect of the invention, an elevator device is disclosed. The elevator device includes a shaft having a plurality of walls defining a pit. Furthermore, the elevator device includes at least one door opening formed in the wall to allow access to the pit. The elevator device includes an elevator pit ladder system with a ladder holding assembly as described in the preceding paragraphs. The ladder holding assembly is positioned on a wall adjacent to the wall having the at least one door opening. The ladder holding assembly includes a movable mechanism adapted to hold the ladder in a removable manner. The movable mechanism moves from a stopped position to bring the ladder closer to the at least one door opening, such that the ladder is lifted and removed from the movable mechanism.
[0014] According to a third aspect of the invention, an elevator pit ladder system is disclosed. The elevator pit ladder system includes a ladder and a ladder holding assembly for removably holding the ladder in the pit of an elevator device. The ladder holding assembly includes a mounting bracket attached to or adapted to be attached to a wall of the pit. Furthermore, the ladder holding assembly includes a movable mechanism coupled to the mounting bracket. The movable mechanism includes at least one pair of cross arms, the pair of cross arms being pivotally connected to each other and movable between a removed position and a parked position. Thus, the aforementioned ladder holding device is constituted by the pair of cross arms. Each arm is movably connected to the mounting bracket, and the ladder is removably held on each arm. The ladder holding assembly includes at least one actuating element supported on the mounting bracket and adapted to be actuated to move the pair of cross arms between a parked position and a removed position. The actuating element is actuated to move the pair of cross arms from the parking position to the removal position, causing the ladder to move away from the mounting bracket to allow the ladder to be removed from the movable mechanism.
[0015] The possible features and advantages of embodiments / aspects of the present invention may be considered to depend on the concepts and findings described below, and are not intended to limit the invention.
[0016] In the first aspect, the ladder retaining assembly is configured to retain the ladder in the pit of the elevator equipment in a removable manner. The advantage of the ladder retaining assembly is that it allows the ladder to be moved closer to a technician standing at the door opening of the elevator equipment. Specifically, the movable mechanism of the ladder retaining assembly includes an arm that retains the ladder in a removable manner. This arm moves between a stopped position and a removed position, allowing the ladder to be moved closer to the technician standing at the door opening.
[0017] First, this has the following advantages: the distance between the ladder and the technician standing at the door opening is significantly reduced, thereby allowing the technician to easily lift and remove the ladder from the movable mechanism. In particular, the reduced distance between the ladder and the technician due to the arm moving to the removal position allows the technician to easily remove the ladder from the movable mechanism with minimal physical effort or strength.
[0018] Secondly, this has the following advantages: Technicians do not need to lean into the shaft to reach the ladder. Specifically, the movable mechanism ensures the ladder is moved closer to the technician standing at the door opening, allowing the technician to remove the ladder from the movable mechanism without leaning into the shaft. Furthermore, this eliminates the need for the technician to use one hand for support when leaning into the shaft to remove the ladder. Therefore, the technician can use both hands to remove the ladder from the movable mechanism and then place it back into the pit. This significantly reduces the physical effort or strain required for the technician to retrieve the ladder and improves the overall safety of the technician when retrieving the ladder from the movable mechanism. After removing the ladder, the technician can place it in the pit such that the bottom of the ladder is supported on the pit floor and the top of the ladder is supported on the door opening flange.
[0019] Furthermore, in the first aspect, the ladder retaining assembly includes at least one locking element adapted to releasably engage with the arm to restrict movement of the arm from a resting position to a removal position. The advantage of having at least one locking element is that the arm remains in the resting position when the at least one locking element is releasably engaged with the arm. Therefore, the at least one locking element acts as a safety measure ensuring that the arm can only move when the at least one locking element is disengaged from the arm. This eliminates accidental movement of the arm due to the weight of the ladder placed on it.
[0020] As previously described, the ladder retaining assembly is positioned on a wall adjacent to the wall with the door opening. Due to this positioning, the ladder can be brought closer to the door opening when the arm is moved to the removal position. Specifically, the ladder retaining assembly is positioned on the wall such that the distance between the ladder and the door opening is significantly reduced when the arm is moved to the removal position. This allows a technician standing at the door opening to remove the ladder from the arm with minimal physical effort or strength.
[0021] Now, in the second aspect, the ladder retaining assembly includes a movable mechanism having at least one pair of cross arms. Furthermore, the ladder retaining assembly includes at least one actuating element adapted to move the pair of cross arms between a parking position and a removal position. This has the advantage that no locking element is required to restrict the movement of the pair of cross arms between the parking and removal positions. A technician can simply actuate the at least one actuating element to move the pair of cross arms from the parking position to the removal position. Subsequently, the technician can actuate the at least one actuating element again to move the pair of cross arms from the removal position to the parking position. Therefore, the technician does not need to physically lock or unlock the movement of the pair of cross arms. This significantly reduces the total physical effort or strength required to operate the ladder retaining assembly.
[0022] In one embodiment, at least one actuating element may be implemented as a pneumatically operated actuator or an electrically operated actuator without departing from the scope of the invention. At least one actuating element may communicate with an actuation switch (not shown). At least one actuating element may be adapted to be actuated by operating the actuation switch. The actuation switch may be located near a door opening and is accessible only when maintenance operations need to be performed in the elevator equipment. In one embodiment, at least one actuation switch may be located inside the shaft and on a wall. In another embodiment, the actuation switch may be located outside the shaft.
[0023] Therefore, the ladder holding component of the elevator pit ladder system of the present invention is safer, less complex, easier to operate, and easier to implement.
[0024] Other embodiments of the invention are described below.
[0025] In one or more embodiments, the arm includes a joint end pivotally coupled to a mounting bracket. Furthermore, the arm includes a support end distal to the joint end. The support end is adapted to hold the ladder in a removable manner.
[0026] This has the following advantages: the arm can be attached to the mounting bracket, allowing the support end of the ladder to be moved closer to an operator standing near a door opening. In particular, the connecting end pivots relative to the mounting bracket, causing the support end to move along a curved path to bring the ladder closer to the operator, thereby significantly reducing the physical effort or strength required for technicians to move the ladder.
[0027] In one or more embodiments, the ladder is attached to a ladder retaining assembly such that the ladder can be removed from the support end when the arm is in the removed position. Furthermore, once the ladder is placed on the support end, the arm can be moved from the removed position to the resting position.
[0028] Advantageously, the support end is designed to hold the ladder in a removable manner, allowing the ladder to be removed when the support end is positioned closer to a technician. Specifically, as the arm moves from the parked position to the removal position, the support end moves closer to the technician, enabling the technician to lift and remove the ladder from the support end. The technician can then place the ladder in the pit to perform maintenance operations. Furthermore, after completing the maintenance operations, the technician can place the ladder on the support end of the arm and then move the arm from the removal position to the parked position. This ensures that the elevator car's path through the shaft is not obstructed by the arm of the ladder holding assembly.
[0029] In one or more embodiments, the at least one arm includes a single arm with a rigid structure that is pivotally movable relative to the mounting bracket between a parking position and a removal position.
[0030] Advantageously, the arm is designed to allow ladders with large structures to be easily supported. In particular, the arm has a rigid structure, which allows it to support ladders with large structures without compromising its structural integrity. Furthermore, this has the advantage that the arm does not require additional reinforcing elements to increase structural strength and prevent any deformation that may occur due to the weight of the ladder supported on it. Therefore, the arm is constructed so that no deformation or structural damage occurs when it is supporting a ladder or when it moves between a parking position and a removal position while supporting a ladder.
[0031] In one or more embodiments, the arm includes a locking pin that protrudes from one side of the folding arm and is adapted to engage with a locking element to restrict movement of the arm.
[0032] As previously described, the ladder retaining assembly includes at least one locking element movably coupled to a mounting bracket and adapted to releasably engage with the arm to restrict movement of the arm from a rest position to a removal position. Advantageously, a locking pin is provided on the arm to engage the locking element with the arm. Specifically, the locking pin engages with the locking element, thereby restricting movement of the arm from the rest position to the removal position. This engagement between the locking pin and the locking element ensures that the arm remains in the rest position and can only be moved to the removal position when the locking element disengages from the locking pin. Thus, this eliminates the risk of the ladder retaining arm accidentally moving from the rest position to the removal position.
[0033] In one or more embodiments, the locking element includes a pivot end adapted to be pivotally coupled to a mounting bracket. Furthermore, the locking end includes a locking end distal to the pivot end. The locking end includes an engaging portion and a guide portion formed adjacent to the engaging portion. When the arm is moved to the parking position, the guide portion guides the locking pin toward the engaging portion. The engaging portion receives the locking pin to restrict movement of the arm from the parking position to the removal position.
[0034] The aforementioned construction of the locking element offers the advantage that the arm can be locked in the parking position without physically moving the locking element. The technician does not need to individually move the locking element to engage it with the arm to restrict movement from the parking position to the removal position. Instead, the technician can push the arm toward the mounting bracket, causing the locking element to automatically engage with the arm to restrict movement. This significantly reduces the physical effort or strain required for the technician to operate the ladder holding assembly, especially when locking the arm in the parking position. Advantageously, the locking end is designed such that a locking pin engages with the locking element by pushing the arm toward the mounting bracket. Specifically, after the ladder is placed on the arm in the removal position, the technician moves the arm to the parking position, causing the locking pin to slide on the guide portion, and subsequently, the locking pin is received within the engagement portion to restrict arm movement.
[0035] In one or more embodiments, the support end includes at least one groove / slot adapted to support the ladder in a removable manner and allow the ladder to be lifted when the arm is in the removed position.
[0036] This has the following advantages: the ladder is securely held on the support end of the arm. Specifically, the groove / slot is designed so that at least a portion of the ladder can be positioned within it to secure the ladder to the arm. Advantageously, this groove / slot is designed to eliminate any relative movement between the ladder and the arm during movement of the arm between the parking and removal positions. The groove / slot ensures that the ladder remains attached to the arm until a technician physically removes the ladder from the arm. Furthermore, the groove / slot prevents the ladder from falling off the ladder holding assembly during movement of the arm between the parking and removal positions.
[0037] Compared to the elevator pit ladder system explained in the preceding paragraphs, another elevator pit ladder system is explained below, which includes a ladder holding assembly having multiple arms for supporting the ladder thereon.
[0038] In one or more embodiments, the at least one arm includes a pair of first foldable arms pivotally coupled to a mounting bracket and positioned parallel to each other. The at least one arm includes a second foldable arm positioned below one of the first foldable arms and pivotally coupled to the mounting bracket. Each of the second and first foldable arms includes: a first connecting member having an engaging end pivotally coupled to the mounting bracket; and a second connecting member pivotally coupled to the first connecting member and having a support end for removably holding the ladder.
[0039] This offers the following advantages: the ladder retaining assembly can move the ladder to a greater distance from the mounting bracket and closer to the door opening. Specifically, longer connecting members (e.g., a first connecting member and a second connecting member) can be deployed to increase the distance the ladder retaining assembly can move the ladder. Furthermore, in the parking position, the first connecting member can move relative to the second connecting member, allowing the foldable arm to retract toward the mounting bracket. Therefore, this ladder retaining assembly with a foldable arm can be deployed in pits with limited space.
[0040] In one or more embodiments, a support end is coupled to a support bracket adapted to hold the ladder in a removable manner. The support bracket includes at least one groove / slot to hold the ladder in a removable manner.
[0041] This has the following advantages: the ladder is securely held in place on a support bracket attached to the support end of each folding arm. Specifically, the groove / slot is designed such that at least a portion of the ladder can be positioned within it to secure the ladder to the support bracket. Advantageously, this groove / slot is designed to eliminate any relative movement between the ladder and the folding arm / support bracket during movement of the folding arm between the parking and removal positions. The groove / slot ensures that the ladder remains attached to the support bracket until it is physically removed from the support bracket by a technician. Furthermore, the groove / slot prevents the ladder from falling off the ladder holding assembly during movement of the folding arm between the parking and removal positions.
[0042] In one or more embodiments, the locking element includes a first locking element movably coupled to the mounting bracket. The first locking element is adapted to restrict or allow movement of the first foldable arm and the second foldable arm between a parking position and a removal position.
[0043] In one or more embodiments, the first locking element is adapted to engage with a ladder resting on a support bracket to restrict movement of the movable mechanism.
[0044] The construction details of the first locking element are similar to those of the locking elements explained in the preceding paragraphs. In one embodiment, the first locking element may be adapted to releasably engage with a ladder resting on a support bracket to restrict movement of the movable mechanism. In such an embodiment, a lateral protrusion of the ladder resting on the support bracket may engage with the first locking element to restrict movement of the folding arm between a parked position and a removed position. In another embodiment, the first locking element may be adapted to releasably engage with a locking pin (similar to the locking pin explained in the preceding paragraphs) formed on a support bracket coupled to a support end of each folding arm.
[0045] The aforementioned construction advantage of the first locking element is that the foldable arm can be locked in the parking position without physically moving the locking element. A technician does not need to individually move the locking element to engage with the ladder positioned on the support bracket to restrict the movement of the foldable arm from the parking position to the removal position. Instead, the technician can push the foldable arm toward the mounting bracket, causing the locking element to automatically engage with the ladder to restrict the movement of the foldable arm. This significantly reduces the physical effort or strength required for the technician to operate the ladder to hold the assembly, and is especially true when locking the foldable arm in the parking position.
[0046] Similar to a locking element, the first locking element also includes a locking end having an engaging portion and a guide portion. Advantageously, the locking end is designed to engage with a lateral protrusion of the ladder resting on a support bracket. Specifically, after the ladder is placed on the support bracket with the folding arm in the removed position, a technician moves the folding arm to the parking position, causing the lateral protrusion of the ladder to slide on the guide portion, and subsequently, the lateral protrusion is received within the engaging portion of the first locking element to restrict movement of the arm.
[0047] In one or more embodiments, the ladder retaining assembly includes a second locking element movably coupled to a second foldable arm. The second locking element is adapted to restrict or allow relative movement between a first connecting member and a second connecting member of the second foldable arm. The second locking element is positioned between the first and second connecting members of the second foldable arm. The second locking element is adapted to pivotally move such that it engages a slot formed in the first connecting member to restrict relative movement between the first and second connecting members. When the first and second foldable arms are in the removed position, the second locking element pivotally moves to engage the slot.
[0048] Advantageously, when the second locking element is engaged, the movement of the second foldable arm is restricted, and thus the movement of the first foldable arm from the removed position to the resting position is also restricted. In particular, the advantage of providing the second locking element is that it ensures the second foldable arm does not move independently when it is in the removed position. When the second locking element is engaged in the slot of the first connecting member, this engagement restricts the relative movement between the first and second connecting members of the second foldable arm. Therefore, once the second locking element is engaged, the movement of the second foldable arm is restricted. This also restricts the movement of the first foldable arm from the removed position to the resting position. Thus, the engagement of the second locking element ensures that the foldable arm will not accidentally move to the resting position when the ladder is removed from the support attached to it.
[0049] In one or more embodiments, when the first foldable arm and the second foldable arm are moved from the parking position to the removal position, the support bracket is horizontally displaced in a straight line relative to the mounting bracket.
[0050] This has the following advantages: the ladder retaining assembly can be deployed in pits with limited space. Specifically, due to this displacement of the support bracket, the ladder retaining assembly can be mounted on the wall of the shaft, allowing the bottom portion of the ladder resting on the support bracket to be very close to the pit floor. Therefore, the limitation of maintaining a large distance between the pit floor and the bottom portion of the ladder is eliminated.
[0051] In one or more embodiments, a safety switch is attached to a mounting bracket and is triggered between a first state and a second state by movement of at least one of the support end and the ladder. The first state indicates the arm's resting position, and the second state indicates the arm's removed position. The safety switch is triggered to the second state when the arm moves from the resting position to the removed position. The safety switch is triggered to the first state when the arm is in the resting position.
[0052] In one embodiment, the safety switch can communicate with the elevator safety circuit of the elevator equipment. In such an embodiment, the safety switch can be configured to transmit an input to the elevator safety circuit indicating that the safety switch should be triggered between a first state and a second state. Based on the input received from the safety switch, the elevator safety circuit can allow the elevator car to operate within the hoistway. For example, if the received input indicates the first state, the elevator safety circuit can allow the elevator car to move within the hoistway. Furthermore, if the received input indicates the second state, the elevator safety circuit can disallow such movement or allow the elevator car to move within the hoistway at a lower speed.
[0053] The advantage of installing a safety switch is that the position of the movable mechanism is transmitted to the elevator safety circuit, thereby ensuring that the elevator car will not be operated until the input received from the safety switch indicates the first state. This prevents the operation or running of the elevator car when one or more arms of the movable mechanism are in the removed position.
[0054] Compared to the elevator pit ladder system explained in the preceding paragraphs, another elevator pit ladder system is explained below, which includes a ladder holding assembly as disclosed in the third aspect of the present invention.
[0055] In one or more embodiments, each arm includes a engagement end that is movably coupled to a mounting bracket. Each arm includes a support end distal to the engagement end, and the support end is adapted to hold the ladder in a removable manner on the support end.
[0056] In one or more embodiments, the paired crossarms include a first pair of crossarms and a second pair of crossarms. Each pair of crossarms includes a first arm. The engaging end of the first arm is pivotally connected to a mounting bracket, and the supporting end of the first arm is slidably connected to a support bracket. Each pair of crossarms includes a second arm. The engaging end of the second arm is slidably connected to a mounting bracket, and the supporting end of the second arm is pivotally connected to a support bracket adapted to hold the ladder.
[0057] In one or more embodiments, the mounting bracket includes at least one vertical slot adapted to engage with an engagement end of the second arm, such that the engagement end slides along the vertical slot as the paired cross arms move between a parking position and a removal position. The support bracket includes at least one vertical slot adapted to engage with a support end of the first arm, such that the support end slides along the vertical slot as the paired cross arms move between a parking position and a removal position.
[0058] The term "shaft" can refer to an enclosed space formed by multiple walls, used to house one or more components of an elevator system.
[0059] The term "pit" can refer to an enclosed space formed below the lowest floor. A pit can be formed as an integral part of a shaft.
[0060] The term "door opening" can refer to an opening formed in a wall of a shaft to allow access into the shaft.
[0061] The term "parking position" can refer to the location where one or more arms of a movable mechanism are positioned furthest from a door opening. In the parking position, the ladder cannot be removed from the movable mechanism. In the parking position, the ladder supported on one or more arms can remain in place without interfering with the elevator car and counterweight of the elevator equipment.
[0062] The term "removal position" can refer to the location where one or more arms of a movable mechanism are positioned closest to a door opening. In the removal position, the ladder supported by the arms can be removed by a technician standing at the door opening without tilting it into the shaft. Attached Figure Description
[0063] Further advantages, features, and details of the invention will become apparent from the following description of embodiments and the accompanying drawings, wherein like or functionally like elements are indicated by the same reference numerals. The drawings are schematic only and are not drawn to scale.
[0064] Figure 1 A perspective view of an elevator pit ladder system for elevator equipment according to an embodiment of the present invention is shown;
[0065] Figure 2 An embodiment of the invention is shown as follows. Figure 1 A magnified perspective view of the elevator pit ladder system shown.
[0066] Figure 3 A perspective view of a ladder retaining assembly according to an embodiment of the present invention is shown;
[0067] Figures 4a to 4cA perspective view depicting the operation of a ladder retaining assembly according to an embodiment of the present invention is shown;
[0068] Figures 5a to 5b A perspective view depicting a safety switch of a ladder retaining assembly according to an embodiment of the present invention is shown;
[0069] Figure 6 A perspective view of an elevator pit ladder system for elevator equipment according to another embodiment of the present invention is shown;
[0070] Figure 7 A perspective view of an elevator pit ladder system with a ladder retaining assembly according to an embodiment of the present invention is shown;
[0071] Figure 8 and Figure 9 An embodiment of the invention is shown as follows. Figure 6 Different perspective views of the enlarged portion of the elevator pit ladder system shown;
[0072] Figures 10a to 10c A perspective view depicting the operation of a ladder retaining assembly according to an embodiment of the present invention is shown;
[0073] Figures 11a to 11c An enlarged perspective view depicting the operation of the second locking element of a ladder retaining assembly according to an embodiment of the present invention is shown.
[0074] Figure 12 A plan view of a ladder retaining assembly in the removed position according to an embodiment of the present invention is shown;
[0075] Figure 13 A perspective view of an elevator pit ladder system for elevator equipment according to an embodiment of the present invention is shown;
[0076] Figure 14 A perspective view of a ladder retaining assembly in the removed position according to an embodiment of the present invention is shown; and
[0077] Figures 15a to 15b A perspective view depicting the operation of a ladder holding assembly according to an embodiment of the present invention is shown. Detailed Implementation
[0078] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0079] Figure 1 A perspective view of an elevator pit ladder system 101 for an elevator device 107 according to an embodiment of the present invention is shown. (Reference) Figure 1The elevator equipment 107 may include a shaft 103 having a plurality of walls 105 defining a pit 109. Furthermore, the elevator equipment 107 may include at least one door opening 113 formed in the walls 105-1 to allow access to the pit 109. Without departing from the scope of the invention, the at least one door opening 113 may be interchangeably referred to as a door opening 113.
[0080] Elevator equipment 107 may include an elevator pit ladder system 101. The elevator pit ladder system 101 may be deployed to retain a ladder 114 in a removable manner within the pit 109 of the elevator equipment 107. In the illustrated embodiment, the elevator pit ladder system 101 may include a ladder retaining assembly 100 positioned on a wall 105-2 adjacent to a wall 105-1 having a door opening 113. Details of the construction and operation of the ladder retaining assembly 100 will be explained in subsequent paragraphs.
[0081] Figure 2 An embodiment of the invention is shown as follows. Figure 1 The enlarged perspective view of the elevator pit ladder system 101 shown. Figure 3 A perspective view of a ladder holding assembly 100 according to an embodiment of the present invention is shown. (Reference) Figures 1 to 3 In the illustrated embodiment, the ladder retaining assembly 100 may include a mounting bracket 102 that is attached to or adapted to be attached to the wall 105-1 of the pit 109. Without departing from the scope of the invention, the mounting bracket may be secured by a plurality of fasteners 115 (such as… Figures 4a to 4c (as shown), for example, bolts and screws, attached to the wall 105-1 in a removable manner.
[0082] In the illustrated embodiment, reference is made to... Figure 2 and Figure 3 The ladder holding assembly 100 may include a movable mechanism 104 coupled to the mounting bracket 102. The movable mechanism 104 may be adapted to hold the ladder 114 in a removable manner. The movable mechanism 104 may be moved from a parking position to bring the ladder 114 close to the door opening 113, thereby lifting and removing the ladder 114 from the movable mechanism 104.
[0083] The movable mechanism 104 may include, but is not limited to, an arm 106 capable of moving between a removal position and a parking position. In the illustrated embodiment, the arm 106 may be a single arm with a rigid structure that is pivotally movable between the parking position and the removal position relative to the mounting bracket 102. The arm 106 defining the ladder holding device may be adapted to hold the ladder 114 in a removable manner.
[0084] Arm 106 may include a connecting end 108 and a support end 110 distal to the connecting end 108. The connecting end 108 may be pivotally coupled to a mounting bracket 102. The connecting end 108 may be fastened to the mounting bracket 102 such that arm 106 is pivotally movable relative to the mounting bracket 102. Furthermore, the support end 110 may be adapted to hold ladder 114 removably on the support end 110. Ladder 114 is attached to ladder holding assembly 100 such that ladder 114 can be removed from support end 110 when arm 106 is in the removed position. When ladder 114 is placed on support end 110, arm 106 can move from the removed position to a resting position.
[0085] refer to Figure 3 In the illustrated embodiment, the support end 110 may include a pair of grooves / slots 110-1 adapted to removably support the ladder 114 and allow the ladder 114 to be lifted when the arm 114 is in the removed position. At least a portion of the ladder 114, such as the lateral protrusions 114-1 (e.g., Figure 4a As shown, the ladder 114 can be positioned in the pair of grooves / slots 110-1 such that it is removably supported on the support end 110. In one embodiment, the ladder 114 can be implemented as a foldable ladder without departing from the scope of the invention. In another embodiment, the ladder 114 can be implemented as a rigid / non-extendable / non-foldable ladder without departing from the scope of the invention.
[0086] In addition, refer to Figure 2 and Figure 3 The ladder holding assembly 100 may include a locking element 116 movably coupled to the mounting bracket 102 and adapted to releasably engage with the arm 106 to restrict movement of the arm 106 from a rest position to a removal position. The locking element 116 may be adapted to be released to allow the arm 106 to move from the rest position to the removal position, causing the ladder 114 to move away from the mounting bracket 102 to allow the ladder 114 to be lifted from the arm 106 and removed.
[0087] Arm 106 may include a locking pin 118 projecting from one side of the folding arm 106. Locking pin 118 may be adapted to engage with locking element 116 to restrict movement of arm 106. In the illustrated embodiment, locking element 116 may include a pivot end 116-1 and a locking end 116-2 distal to the pivot end 116-1. Pivoting end 116-1 may be adapted to be pivotally coupled to mounting bracket 102. Furthermore, locking end 116-2 may include, but is not limited to, an engagement portion 120 and a guide portion 122 formed adjacent to the engagement portion 120. When arm 106 is moved to the parking position, guide portion 122 may guide locking pin 118 toward engagement portion 120. Engagement portion 120 may receive locking pin 118 to restrict movement of arm 106 from the parking position to the removal position.
[0088] Figures 4a to 4c A perspective view depicting the operation of a ladder holding assembly 100 according to an embodiment of the present invention is shown. (Reference) Figure 4a The arm 106 of the movable mechanism 104 can be positioned in a parked position. In the parked position, the locking element 116 can engage with the locking pin 118 of the arm to restrict pivoting movement of the arm 106 from the parked position to the removed position. Furthermore, in the parked position, the support end 110 of the arm 106 can hold the ladder 114 in a removable manner.
[0089] Now for reference Figure 4b The locking element 116 can be pivotally moved by a technician to disengage it from the locking pin 118. This allows the arm 106 to pivotally move relative to the mounting bracket 102. (See reference...) Figure 4c Arm 106 can be pivotally moved from the parking position to the removal position, allowing the support end 110 holding ladder 114 to move closer to the door opening 113. Once arm 106 reaches the removal position, a technician can then remove ladder 114 from the support end 110 of arm 106. Afterward, ladder 114 can be placed in pit 109, allowing a technician to climb down from the door opening 113 into pit 109 using ladder 114.
[0090] Figures 5a to 5b A perspective view depicting a safety switch 111 of a ladder retaining assembly 100 according to an embodiment of the present invention is shown. (Reference) Figure 5a and Figure 5bThe ladder holding assembly 100 may include a safety switch 111 attached to the mounting bracket 102. The safety switch 111 may be adapted to be triggered between a first state and a second state by movement of at least one of the support end 110 and the ladder 114. The first state may indicate a stopped position of the arm 106, and the second state may indicate a removed position of the arm 106. The safety switch 111 may be triggered to the second state when the arm 106 moves from the stopped position to the removed position. The safety switch 111 may be triggered to the first state when the arm 106 is in the stopped position.
[0091] refer to Figure 5a In the illustrated embodiment, the safety switch 111 may have an actuation button 111-1 adapted to be actuated by a portion of the ladder 114 supported on the arm 106 (e.g., a lateral protrusion 114-1). In the parked position, the safety switch 111 can be triggered to a first state by the lateral protrusion 114-1 of the ladder 114. The first state may indicate that the arm 106 is in the parked position and the ladder is positioned on the support end 110 of the arm 106.
[0092] refer to Figure 5b In the illustrated embodiment, arm 106 can move from the parked position to the removed position, causing the ladder positioned on the support end to move away from safety switch 111. Due to this movement of arm 106, the safety switch can be triggered to a second state. The second state indicates that arm 106 is in the removed position.
[0093] Figure 6 A perspective view of an elevator pit ladder system 201 for elevator equipment according to another embodiment of the present invention is shown. Figure 7 A perspective view of an elevator pit ladder system 201 with a ladder retaining assembly 200 according to an embodiment of the present invention is shown. Similar to the ladder retaining assembly 100, the ladder retaining assembly 200 may also include a mounting bracket 102 attached to or adapted to be attached to the wall 105-1 of the pit 109. Without departing from the scope of the invention, the mounting bracket 102 can be secured by a plurality of fasteners 203 (such as… Figure 8 (as shown), for example, bolts and screws, attached to the wall 105-1 in a removable manner.
[0094] Furthermore, the elevator pit ladder system 201 may include a bracket 205 mounted on the wall 105-1 or the base plate 109-1 of the pit 109 to support the bottom portion of the ladder 114 when the ladder 114 is placed on the ladder holding assembly 200. In one embodiment, reference... Figure 6 The bottom portion of the ladder 114 can rest on a bracket 205 mounted on the base plate 109-1 of the pit 109. In another embodiment, refer to... Figure 7 The bottom part of the ladder 114 can be placed on the bracket 205 mounted on the wall 105-1.
[0095] Figure 8 and Figure 9 An embodiment of the invention is shown as follows. Figure 6 Different perspective views of the enlarged portion of the elevator pit ladder system 201 shown. Figures 10a to 10c A perspective view depicting the operation of a ladder holding assembly 200 according to an embodiment of the present invention is shown. (Reference) Figures 8 to 10c The ladder holding assembly 200 may include a movable mechanism 202 coupled to the mounting bracket 102. The movable mechanism 202 may include at least one arm 204-1, 204-2, 206 capable of moving between a removed position and a parked position. The arms 204-1, 204-2, 206 may be adapted to hold the ladder 114 in a removable manner.
[0096] In the illustrated embodiment, reference is made to... Figures 10a to 10c The at least one arm 204-1, 204-2, 206 may include, but is not limited to, a pair of first foldable arms 204-1, 204-2 and a second foldable arm 206. Without departing from the scope of the invention, the pair of first foldable arms 204-1, 204-2 may be interchangeably referred to as first foldable arms 204-1, 204-2. Furthermore, the first foldable arms 204-1, 204-2 and the second foldable arm 206 may be collectively referred to as arms 204-1, 204-2, 206.
[0097] The first foldable arms 204-1 and 204-2 are pivotally connected to the mounting bracket 102 and positioned parallel to each other. The second foldable arm 206 is positioned below the foldable arm 204-2 and pivotally connected to the mounting bracket 102. Each of the first foldable arms 204-1 and 204-2 has similar operational and construction details without departing from the scope of the invention.
[0098] refer to Figures 10a to 10c Each arm 204-1, 204-2, 206 may include a connecting end 208 pivotally connected to the mounting bracket 102. Furthermore, each arm 204-1, 204-2, 206 may include a support end 212 distal to the connecting end 208. The support end 212 may be adapted to hold the ladder 114 in a removable manner. In the illustrated embodiment, reference... Figure 10bThe support end 212 can be coupled to a support bracket 214, which is adapted to hold the ladder 114 in a removable manner. The support bracket 214 may include a pair of grooves / slots 215 to hold the ladder 114 in a removable manner. When the arms 204-1, 204-2, 206 are moved from the parking position to the removal position, the support bracket 214 can be horizontally displaced in a straight line relative to the mounting bracket 102.
[0099] In the illustrated embodiment, each arm 204-1, 204-2, 206 may include, but is not limited to, a first connecting member 220 and a second connecting member 222. The first connecting member 220 may include an engagement end 208 pivotally coupled to the mounting bracket 102. Furthermore, the second connecting member 222 is pivotally coupled to the first connecting member 220. The second connecting member 222 may include a support end 212 to removably hold the ladder 114.
[0100] Additionally, the ladder holding assembly 200 may include a first locking element 216 movably coupled to the mounting bracket 102. The first locking element 216 may be adapted to restrict or allow movement of the arms 204-1, 204-2 between a parking position and a removal position. Similar to locking element 116, the first locking element 216 may be adapted to be released to allow the arms 204-1, 204-2 to move from the parking position to the removal position, such that the ladder 114 moves away from the mounting bracket 102 to allow the ladder 114 to be lifted and removed from the arms 204-1, 204-2, 206.
[0101] In the illustrated embodiment, reference is made to... Figures 10a to 10c The first locking element 216 may be adapted to releasably engage with the ladder 114 resting on the support bracket 214 to restrict movement of the movable mechanism 202. In such an embodiment, the first locking element 216 may be adapted to releasably engage with a lateral protrusion 114-1 of the ladder 114 resting on the support bracket 214. In another embodiment, the first locking element 216 may be adapted to releasably engage with a locking pin (not shown) similar to a locking pin 118 formed on the support bracket 214, which is coupled to the support end 212 of each arm 204-1, 204-2, 206.
[0102] The construction and operation details of the first locking element 216 are similar to those of the locking element 116 of the ladder retaining assembly 100.
[0103] Figures 11a to 11cAn enlarged perspective view depicting the operation of the second locking element 218 of a ladder holding assembly 200 according to an embodiment of the present invention is shown. Figure 12 A plan view of the ladder retaining assembly 200 in the removed position according to an embodiment of the present invention is shown. (Reference) Figures 11a to 11c and Figure 12 The ladder holding assembly 200 may include, but is not limited to, a second locking element 218 that is movablely connected to the second foldable arm 206.
[0104] refer to Figures 11a to 11c The second locking element 218 may be adapted to restrict or allow relative movement between the first connecting member 220 and the second connecting member 222 of the second foldable arm 206. The second locking element 218 may be positioned between the first connecting member 220 and the second connecting member 222 of the second foldable arm 206. The second locking element 218 may be adapted to be pivotally movable such that it engages with a slot 217 formed in the first connecting member 220 to restrict relative movement between the first connecting member 220 and the second connecting member 222. When the arms 204-1, 204-2, 206 are in the removed position, the second locking element 218 may be pivotally movable to engage with the slot 217.
[0105] Similar to ladder retaining component 100, see reference. Figures 10a to 12 The ladder retaining assembly 200 may also include a safety switch 224 attached to the mounting bracket 102. The safety switch 224 can be triggered between a first state and a second state by movement of the support ends 212 of each arm 204-1, 204-2, 206 and the ladder 114. When the arms 204-1, 204-2, 206 move from the parked position to the removed position, the safety switch 224 can be triggered to the second state. When the arms 204-1, 204-2, 206 are in the parked position, the safety switch 224 can be triggered to the first state.
[0106] In the illustrated embodiment, reference is made to... Figure 10c The safety switch 224 may include a slot 224-1 adapted to receive a key 225. The key 225 can be attached to a support bracket 214 via a bracket 227. When the arms 204-1, 204-2, 206 can be moved to the parking position, the key 225 can engage with the slot 224-1, and subsequently trigger the safety switch 224 to a first state. Furthermore, when the arms 204-1, 204-2, 206 can be moved from the parking position to the removal position, the key 225 can disengage from the slot 224-1, and subsequently trigger the safety switch 224 to a second state.
[0107] Figure 13A perspective view of a ladder holding assembly 300 for an elevator device according to another embodiment of the present invention is shown. Figure 14 A perspective view of a ladder retaining assembly 300 in the removed position according to an embodiment of the present invention is shown. Figures 15a to 15b A perspective view depicting the operation of the ladder holding assembly 300 according to an embodiment of the present invention is shown.
[0108] refer to Figures 13 to 15b The elevator pit ladder system 301 may include a ladder 114 and a ladder retaining assembly 300 for removably retaining the ladder 114 in the pit 109 of the elevator equipment 107. Similar to ladder mounting assemblies 100 and 200, the ladder retaining assembly 300 may also include a mounting bracket 302 attached to or adapted to be attached to the wall 105-1 of the pit 109. Furthermore, the ladder retaining assembly 300 may include a movable mechanism 304 coupled to the mounting bracket 302. The movable mechanism 304 may include two pairs of cross arms 306-1, 306-2, 307-1, and 307-2, which are pivotally connected to each other and movable between a removed position and a parked position. Arms 306-1 and 306-2 may be interchangeably referred to as arm 306. Similarly, arms 307-1 and 307-2 can be interchangeably referred to as arm 307.
[0109] Each arm 306-1, 306-2, 307-1, 307-2 can be movably connected to the mounting bracket 302, and the ladder 114 is removably held on each arm. Each arm 306-1, 306-2, 307-1, 307-2 may include, but is not limited to, a connecting end 308 and a support end 310 distal to the connecting end 308. The connecting end 308 can be movably connected to the mounting bracket 302. Furthermore, the support end 310 can be adapted to removably hold the ladder 114 on the support end.
[0110] These two pairs of cross arms 306, 307 may include a first pair of cross arms 306-1, 306-2 and a second pair of cross arms 307-1, 307-2. The first pair of cross arms 306-1, 306-2 may include a first arm 306-1 and a second arm 306-2. Similarly, the second pair of cross arms 307-1, 307-2 may include a first arm 307-1 and a second arm 307-2. The engaging end 308 of each first arm 306-1, 307-1 may be pivotally connected to the mounting bracket 302. The supporting end 310 of each first arm 306-1, 307-1 may be slidably engaged to the support bracket 316. The engaging end 308 of each second arm 306-2, 307-2 may be slidably connected to the mounting bracket 302. The support end 310 of each second arm 306-2, 307-2 can be pivotally connected to a support bracket 316 suitable for holding the ladder 114.
[0111] Furthermore, the ladder holding assembly 300 may include an actuating element 312 supported on the mounting bracket 302. The actuating element 312 may be adapted to be actuated to move the arms 306-1, 306-2, 307-1, and 307-2 between a parking position and a removal position. The actuating element 312 may be actuated to move the arms 306-1, 306-2, 307-1, and 307-2 from the parking position to the removal position, causing the ladder 114 to move away from the mounting bracket 302 to allow removal of the ladder 114 from the movable mechanism 304.
[0112] In one embodiment, the actuating element 312 may be implemented as a pneumatically operated actuator or an electrically operated actuator without departing from the scope of the invention. The actuating element 312 may communicate with an actuation switch (not shown). The actuating element 312 may be adapted to be actuated by operating the actuation switch. The actuation switch may be located near the door opening 113 and is accessible only when maintenance operations need to be performed in the elevator equipment 107. In one embodiment, the actuation switch may be located inside the hoistway 103 and on the wall 105-1. In another embodiment, the actuation switch may be located outside the hoistway 103.
[0113] Mounting bracket 302 may include a pair of vertical slots 302-1 adapted to engage with the engagement ends 308 of the second arms 306-2, 307-2, such that the engagement ends 308 slide along the pair of vertical slots 302-1 when the arms 306-1, 306-2, 307-1, 307-2 move between a parking position and a removal position. Support bracket 316 may include a pair of vertical slots 316-1 adapted to engage with the support ends 310 of the first arms 306-1, 307-1, such that the support ends 310 slide along the pair of vertical slots 316-1 when the arms 306-1, 306-2, 307-1, 307-2 move between a parking position and a removal position.
[0114] Furthermore, similar to ladder retaining assemblies 100 and 200, ladder retaining assembly 300 may include a safety switch 318 attached to mounting bracket 302. Safety switch 318 can be triggered between a first state and a second state by movement of the support ends 310 of arms 306-1, 306-2, 307-1, and 307-2 and ladder 114. When arms 306-1, 306-2, 307-1, and 307-2 move from the parked position to the removed position, safety switch 318 can be triggered to the second state. Furthermore, when arms 306-1, 306-2, 307-1, and 307-2 are in the parked position, safety switch 318 can be triggered to the first state. The construction and operating details of safety switch 318 are similar to those of safety switch 224.
[0115] After removing ladder 114 from ladder retaining assemblies 100, 200, and 300, a technician can place ladder 114 in pit 109 such that the bottom portion of ladder 114 is supported on the base plate 109-1 of pit 109, and the top portion of ladder 114 is supported on the flange of door opening 113.
[0116] While specific language has been used to describe the subject matter of the invention, no limitation is intended as a result. It will be apparent to those skilled in the art that various working modifications can be made to the methods to implement the inventive concept as taught herein. The accompanying drawings and the foregoing description provide examples of embodiments. Those skilled in the art will understand that one or more of the described elements can be well combined into a single functional element. Alternatively, certain elements may be divided into multiple functional elements. Elements from one embodiment may be added to another embodiment.
Claims
1. An elevator pit ladder system (101, 201) comprising a ladder (114) and a ladder holding assembly (100, 200) for removably holding the ladder (114) in a pit (109) of an elevator device (107), the ladder holding assembly (100, 200) comprising: Mounting bracket (102), which is attached to or adapted to be attached to the wall (105-2) of the pit (109). The ladder retaining assembly (100, 200) is characterized in that it comprises: A movable mechanism (104, 202) is coupled to the mounting bracket (102). The movable mechanism (104, 202) includes a ladder holding device adapted to hold the ladder (114) in a removable manner. The ladder holding device is movable between a removal position and a rest position. The ladder holding device is movable from the rest position to the removal position such that the ladder (114) moves away from the mounting bracket (102). The ladder (114) can be removed from the ladder holding device when the ladder holding device is in the removal position.
2. The elevator pit ladder system (101, 201) according to claim 1, wherein, The movable mechanism (104, 202) also includes: At least one locking element (116, 216) is movably coupled to the mounting bracket (102) and adapted to releasably engage with the ladder retaining device to restrict movement of the ladder retaining device from the parking position to the removal position, wherein the at least one locking element (116, 216) will be released to allow the ladder retaining device to move from the parking position to the removal position, such that the ladder (114) moves in a direction away from the mounting bracket (102) to allow the ladder (114) to be lifted from the ladder retaining device and removed.
3. The elevator pit ladder system (101, 201) according to claim 1 or 2, wherein, The movable mechanism (104, 202) of the ladder retaining assembly includes a pivotable retaining device, which includes at least one arm (106, 204-1, 204-2, 206).
4. The elevator pit ladder system (101, 201) according to claim 3, wherein, The arms (106, 204-1, 204-2, 206) include: The engaging ends (108, 208) are pivotally connected to the mounting bracket (102); and Support ends (110, 212) are located distal to the joint ends (108, 208) and are adapted to hold the ladder (114) in a removable manner on the support ends.
5. The elevator pit ladder system (101, 201) according to any one of claims 1 to 4, wherein: The ladder (114) is attached to the ladder retaining assembly (100) such that the ladder (114) can be removed from the support end (110) when the ladder retaining device or the arm (106) is in the removed position; and / or After the ladder (114) is placed on the support end (110), the ladder holding device or the arm (106) can be moved from the removal position to the parking position.
6. The elevator pit ladder system (101, 201) according to any one of claims 3 to 5, wherein, The at least one arm (106) includes a single arm with a rigid structure that is pivotally movable between the parking position and the removal position relative to the mounting bracket (102).
7. The elevator pit ladder system (101, 201) according to any one of claims 3 to 6, wherein, The arm (106) includes a locking pin (118) that protrudes from one side of the folding arm (106) and is adapted to engage with the locking element (116) to restrict movement of the arm (106).
8. The elevator pit ladder system (101, 201) according to any one of claims 3 to 7, wherein, The locking element (116) includes a pivot end (116-1) and a locking end (116-2). The pivot end (116-1) is adapted to be pivotally connected to the mounting bracket (102); and The locking end (116-2) is distal to the pivot end (116-1), and the locking end (116-2) comprises: The joint portion (120); and A guide portion (122) is formed adjacent to the joining portion (120). in: When the arm (106) moves to the parking position, the guide portion (122) guides the locking pin (118) toward the engagement portion (120), and The engagement portion (120) receives the locking pin (118) to restrict the movement of the arm (106) from the parking position to the removal position.
9. The elevator pit ladder system (101, 201) according to any one of claims 3 to 8, wherein, The support end (110) includes at least one groove / slot (110-1) adapted to support the ladder (114) in a removable manner and to allow the ladder (114) to be lifted when the arm (114) is in the removed position.
10. The elevator pit ladder system (101, 201) according to claim 3, wherein, The at least one arm (204-1, 204-2, 206) includes: A pair of first foldable arms (204-1, 204-2), the pair of first foldable arms being pivotally connected to the mounting bracket (102) and positioned parallel to each other; and The second foldable arm (206) is positioned below one of the first foldable arms (204-2) and is pivotally connected to the mounting bracket (102). Each of the second foldable arm (206) and the first foldable arm (204-1, 204-2, 206) includes: A first connecting member (220) having a mating end (208) pivotally connected to the mounting bracket (102); and A second connecting member (222) is pivotally connected to the first connecting member (220) and has a support end (212) that holds the ladder (114) in a removable manner.
11. The elevator pit ladder system (101, 201) according to any one of claims 4 to 10, further comprising: Safety switches (111, 224), attached to the mounting bracket (102), are triggered between a first state and a second state by movement of at least one of the support end (110, 212) and the ladder (114). Wherein, the first state indicates the parking position of the arms (106, 204-1, 204-2, 206), and the second state indicates the removal position of the arms (106, 204-1, 204-2, 206). in: When the arms (106, 204-1, 204-2, 206) move from the parking position to the removal position, the safety switches (111, 224) are triggered to the second state, and When the arms (106, 204-1, 204-2, 206) are in the parking position, the safety switches (111, 224) are triggered to the first state.
12. The elevator pit ladder system (301) according to claim 1, wherein, The movable mechanism (304) includes: At least a pair of cross arms (306-1, 306-2, 307-1, 307-2), said at least a pair of cross arms being pivotally connected to each other and movable between a removed position and a parked position, each arm (306-1, 306-2, 307-1, 307-2) being movably connected to the mounting bracket (302), and holding the ladder (114) removably on each arm; and At least one actuating element (312) is supported on the mounting bracket (302) and is adapted to be actuated to move the paired crossarms (306-1, 306-2, 307-1, 307-2) between the parking position and the removal position. The actuating element (312) is actuated to move the pair of cross arms (306-1, 306-2, 307-1, 307-2) from the parking position to the removal position, so that the ladder (114) moves away from the mounting bracket (302) to allow the ladder (114) to be removed from the movable mechanism (304).
13. The elevator pit ladder system (301) according to claim 12, wherein, The paired crossarms (306, 307) include a first pair of crossarms (306-1, 306-2) and a second pair of crossarms (307-1, 307-2), each pair of crossarms (306, 307) comprising: The first arm (306-1, 307-1), wherein the engaging end (308) of the first arm (306-1, 307-1) is pivotally connected to the mounting bracket (302), and the supporting end (310) of the first arm (306-1, 307-1) is slidably engaged to the supporting bracket (316); and The second arm (306-2, 307-2), wherein the engaging end (308) of the second arm (306-2, 307-2) is slidably connected to the mounting bracket (302), and the supporting end (310) of the second arm (306-2, 307-2) is pivotally connected to the support bracket (316) adapted to hold the ladder (114).
14. An elevator device (107), comprising: The shaft (103) has multiple walls (105) defining a pit (109); At least one door opening (113) is formed in the wall (105-1) to allow access to the pit (109); and An elevator pit ladder system with a ladder retaining assembly (100, 200) according to any one of claims 1 to 13, the ladder retaining assembly being positioned on a wall (105-2) adjacent to a wall (105-1) having the at least one door opening (113), the ladder retaining assembly (100, 200) including a movable mechanism (104, 202). The movable mechanism (104, 202) is adapted to hold the ladder (114) in a removable manner, wherein the movable mechanism (104, 202) moves from a parking position to bring the ladder (114) close to the at least one door opening (113) so as to lift and remove the ladder (114) from the movable mechanism (104, 202).