Trigger type elevator buffering device arranged on car frame
By installing a trigger-type buffer device on the elevator car frame and using the car safety clamp trigger signal to control the buffer to drop, the problem of installing a buffer device in an old building elevator without a pit is solved, achieving a safety protection effect. It is suitable for elevator renovation in both old and new buildings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-03-13
AI Technical Summary
When installing elevators in old buildings, it is impossible to set up a pit, which makes it difficult to install elevator buffer devices and thus cannot effectively protect the safety of the car and the people inside.
Design a trigger-type elevator buffer device installed on the car frame, including a housing, buffer column, spring, locking teeth, unlocking and reset pull rope and swing arm. The buffer is controlled to drop down by the trigger signal of the car safety gear to achieve buffer protection for the car.
In the absence of a pit, the device can effectively buffer the descent of the elevator car, protecting the safety of personnel and equipment. It has a simple structure, low cost, and is easy to install and maintain, making it suitable for the renovation of old buildings.
Smart Images
Figure CN223990795U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to elevators, specifically to a trigger-type elevator buffer device installed on the car frame. Background Technology
[0002] In recent years, with the aging of my country's population, many duplex apartments and older buildings without elevators are installing them to facilitate the movement of elderly people with mobility issues and wheelchair users. Elevators installed in newly built buildings are typically constructed with the building itself and include a pit. The elevator's buffer device is located in the pit, providing cushioning protection for the elevator car and its occupants in the event of a sudden fall. However, elevators installed in older buildings are often limited by the building's original structure, making it difficult to install a pit and thus hindering the installation of buffer devices, which is detrimental to the safety of the elevator car and its occupants. Summary of the Invention
[0003] The purpose of this utility model is to provide a trigger-type elevator buffer device installed on the car frame that can buffer the elevator without a pit, thereby improving the safety of the car and the people inside.
[0004] The technical solution of this utility model is as follows: It includes a housing, inside which is a buffer column that slides axially with the housing. A buffer is provided at the lower end of the buffer column. A spring is provided between the buffer column and the housing to make the buffer column spring downward. A locking tooth is hinged on the buffer column. A locking tooth spring is provided between the locking tooth and the buffer column. An unlocking and resetting pull rope is connected to the locking tooth, with its lower end connected to the locking tooth and its upper end extending outside the housing. Several one-way teeth are provided on the side wall of the housing, which cooperate with the locking teeth to prevent the buffer from retracting upward after it pops downward. A locking pin hole is provided radially on the side wall of the housing. A locking pin is slidably installed in the locking pin hole. A locking groove is provided on the outer wall of the buffer column, which cooperates with the locking pin when the buffer retracts upward. A swing arm is provided on the outside of the housing, which is hinged to the end of the swing arm located outside the housing. A swing arm spring is provided between the swing arm and the housing. A trigger pull rope or pull rod that cooperates with the lifting arm of the car safety clamp is connected to the swing arm.
[0005] The technical advantages of this invention are: When installed in an elevator car, it provides cushioning protection for the elevator car and its occupants even without a pit. It is suitable for elevator installations in duplexes and older buildings, as well as new buildings or factories where a pit cannot be provided for other reasons, and other buildings requiring elevator installation. In the event of a car malfunction, this device immediately receives a trigger signal from the car's safety clamp lifting arm and controls the buffer to spring down to the bottom of the car, thus cushioning the falling car and protecting personnel and equipment, reducing injury and damage from the car's fall. It has a simple structure, low cost, and easy-to-use working principle, making it convenient for installation, use, and maintenance. Its ideal cushioning effect makes it suitable for widespread application in the renovation of older buildings. This device can also be installed upside down in the elevator car to cushion the impact of an elevator falling to the top. Attached Figure Description
[0006] Figure 1 This is a cross-sectional view of the structure of the present invention in the state to be triggered according to an embodiment;
[0007] Figure 2 This is a cross-sectional view of the triggered state of an embodiment of the present invention;
[0008] Figure 3 This is a schematic diagram of the buffer column reset device according to an embodiment of the present invention. Detailed Implementation
[0009] like Figure 1 , Figure 2 , Figure 3 As shown, it includes a housing 1, a buffer post 2 that slides axially within the housing 1, a buffer 21 at the lower end of the buffer post 2, a spring 3 between the buffer post 2 and the housing 1 that causes the buffer post 2 to spring downwards, and a locking tooth 22 hinged to the buffer post 2. A locking tooth spring 23 is provided between the locking tooth 22 and the buffer post 2. An unlocking and resetting pull rope 24 is connected to the locking tooth 22 at its lower end and extends to the outside of the housing 1 at its upper end. Several one-way teeth 11 are provided on the side wall of the housing 1 to cooperate with the locking tooth 22 so that the buffer 21 cannot retract upward after being ejected downward. A locking pin hole 12 is provided on the side wall of the housing 1 in the radial direction. A locking pin 13 is slidably installed in the locking pin hole 12. A locking groove 25 is provided on the outer wall of the buffer post 2 to cooperate with the locking pin 12 when the buffer 21 retracts upward. A swing arm 4 is provided on the outside of the housing 1. The swing arm 4 is hinged to the end of the locking pin 13 located outside the housing 1. A swing arm spring 41 is provided between the swing arm 4 and the housing 1. A trigger pull rope or pull rod 42 that cooperates with the lifting arm of the car safety clamp is connected to the swing arm 4.
[0010] The housing 1 is cylindrical, the buffer column 2 is cylindrical, the inner wall of the housing 1 above the buffer 21 is provided with a lower support sleeve 14 that slides axially with the outer wall of the buffer column 2, and the outer wall of the buffer column 2 below the locking groove 25 is provided with an upper support sleeve 26 that slides axially with the inner wall of the housing 1.
[0011] The buffer 21 is a polyurethane or rubber column with its upper end fixedly mounted on the lower end face of the buffer column 2 and its lower end facing downward.
[0012] Spring 3 is a compression spring located inside the housing. The upper end of the housing 1 is provided with an end cap 15. The upper end face of spring 3 is engaged with the end cap 15 and sleeved on the outside of the upper positioning platform 16 located on the lower surface of the end cap 15. The lower end face of spring 3 is engaged with the buffer post 2 and sleeved on the outside of the lower positioning platform 27 located on the upper end face of the buffer post 2. The buffer post 2 above the locking tooth 22 and the housing end cap 15 are respectively provided with through holes along the axial direction. The lower end of the unlocking and reset pull rope 24 is connected to the position of the locking tooth 22 away from the hinge axis, and the upper end extends from bottom to top through the through hole of the buffer post 2, the spring 3 and the through hole of the housing end cap 15 to the top of the housing 1.
[0013] Spring 3 may be a tension spring whose upper end is connected to buffer post 2 and whose lower end is connected to housing 1, causing buffer post 2 to spring downward.
[0014] The buffer post 2 has a locking tooth mounting groove 28 in the middle. The lower end of the locking tooth 22 is hinged to the buffer post 2 through a hinge shaft. The locking tooth spring 23 is a torsion spring that is fitted on the hinge shaft, with one end cooperating with the locking tooth 22 and the other end cooperating with the buffer post 2.
[0015] A rack groove 17 is provided axially on the side wall of the housing 1 at the position where it mates with the locking tooth 22. A rack 18 with several one-way teeth 11 is installed in the rack groove 17. The downward-facing surface of each one-way tooth 11 mates with the upper end surface of the locking tooth 22 facing the one-way tooth 11.
[0016] The lower side of the end where the locking pin 13 and the locking groove 25 are engaged is provided with a buffer post 2 that pushes the locking pin 25 outward when it is reset upward. The buffer post 2 is provided with a sloping push surface 29 that is engaged with the guide slope 19.
[0017] The swing arm 4 is L-shaped. Its turning point is hinged to the housing 1 via a hinge pin. One free end of the swing arm 4 is hinged downwards to the locking pin 13, and the other free end is laterally connected to the trigger rope or pull rod 42, pointing away from the axis of the housing 1. The swing arm spring 41 is a torsion spring fitted onto the hinge pin, with one end engaging with the swing arm 4 and the other end engaging with the housing 1. The hole where the swing arm 4 hinges to the locking pin 13 is a vertically elongated hole, allowing the swing arm 4 to hinge and slide with the locking pin 13 during swinging, ensuring that the locking pin 13 can extend and retract freely without restriction.
[0018] The top of the housing 1 is equipped with a buffer post reset device 5 that cooperates with the unlocking and reset pull rope 24. See the specific structure below. Figure 3 The buffer column reset device 5 consists of a winch 51, a winch base 52, and a crank handle 53. The winch base 52 is fixedly installed on the housing 1, and the winch 51 is rotatably installed on the winch base 52. The upper end of the unlocking reset pull rope 24 is connected to and wound on the winch 51. A square crank hole 54 is provided on one end face of the winch 51 to cooperate with the crank handle 53. A square head 55 is provided on the crank handle 53 to cooperate with the crank hole 54.
[0019] One end of the winch 51 is provided with a ratchet 56, and the winch seat 52 is provided with a ratchet 57 and a ratchet seat plate 58. The ratchet seat plate 58 is hinged to the winch seat 52. A clutch spring 59 is provided between the ratchet seat plate 58 and the winch seat 52, with one end cooperating with the ratchet seat plate 58 and the other end cooperating with the winch seat 52. The ratchet 57 is hinged to the ratchet seat plate 58 and cooperates with the ratchet 56. A ratchet torsion spring 60 is fitted on the hinge shaft where the ratchet 57 and the ratchet seat plate 58 are hinged. One end of the ratchet 57 cooperates with the ratchet 57 and the other end cooperates with the ratchet seat plate 58. The crank handle 53 is provided with a clutch cylinder 61 located near the square head 55. When the square head 55 is inserted into the crank handle hole 54, it pushes the ratchet seat plate 58 to rotate through an angle, so that the ratchet 57 engages with the ratchet wheel 56. There is a transition frustum 62 with a diameter that gradually increases between the square head 55 and the clutch cylinder 61. The ratchet seat plate 58 is provided with a clutch protrusion 63 that protrudes out of the ratchet seat plate 58 and engages with the transition frustum 62 and the clutch cylinder 61 on the crank handle 53.
[0020] Operating principle:
[0021] When in use, this buffer device is installed outside the car on the car frame. In the untriggered state, the lower end of the buffer 21 is not lower than the lower bottom surface of the car. The trigger rope or lever 42 is connected to the car safety clamp lifting arm located on the car frame. One buffer device or multiple buffer devices can be installed on the car frame.
[0022] When the elevator malfunctions, the speed governor activates, causing the car safety gear lifting arm, connected to the speed governor, to engage. This, in turn, triggers the pull rope or lever 42, causing the swing arm 4 to swing, pulling the locking pin 13 out of the locking groove 25 and releasing the buffer column 2. Under the action of the spring 3, the buffer column 2 rapidly springs downwards, causing the buffer 21 to eject from the housing 1 and protrude to the bottom surface of the car. Simultaneously with the downward movement of the buffer column 2, the locking teeth 22 slide down to the position of the one-way teeth 11. The locking tooth spring 23 engages the locking teeth 22 with the one-way teeth 11, providing an upward upper limit to the buffer column 2, preventing it from retracting upwards. The buffer 21 ejects faster than the car descends; when the car reaches the bottom, the lower end of the buffer 21 will contact the ground first, providing a cushioning effect to protect the car and its occupants.
[0023] During normal car operation, buffer 21 needs to be reset upwards to ensure the car can descend to the lowest level normally. After the fault is cleared, the car safety clamp lifting arm resets and releases the locking pin 13. To retract buffer 2 upwards, elevator maintenance personnel need to hold the crank handle 53 and insert the square head 55 on the crank handle 53 into the crank handle hole 54 on the winch 51. During insertion, the transition frustum 62 and clutch cylinder 61 on the crank handle 53 will push the ratchet seat plate 58 to rotate through an angle via the clutch protrusion 63, so that the ratchet 57 engages with the ratchet 56 on the winch 51. Rotating the crank handle 53 in the forward direction will drive the winch 51 to rotate, pulling the buffer column 2 upwards and compressing the spring 3. The ratchet 57 and ratchet 56 are used to prevent the winch 51 from reversing. When the unlocking and reset pull rope 24 moves upwards, it will first pull the locking tooth 22 to rotate at an angle and separate it from the one-way tooth 11, so that the upward movement of the buffer column 2 is unrestricted. By continuing to crank handle 53, the buffer post 2 and buffer 21 will retract upwards via locking teeth 22. When the buffer post 2 moves upwards and contacts locking pin 13, it will first push locking pin 13 to slide outwards from housing 1 until the end face of locking pin 13 abuts against the outer wall of buffer post 2. When the buffer post 2 continues to move upwards to the position where locking groove 25 engages with locking pin 13, locking pin 13 will spring into locking groove 25 under the action of swing arm 4 and swing arm spring 41, locking buffer post 2 and preventing it from springing downwards under the action of spring 3. Buffer 21 then completes its reset and enters the ready-to-trigger state.
[0024] After the buffer 21 is reset, the crank 53 needs to be removed. The ratchet seat plate 58 rotates back to reset under the action of the clutch spring 59. The ratchet 57 disengages from the ratchet 56 on the winch 51 and no longer engages with the ratchet 56, so that when the buffer column 2 is released, it can pull the winch 51 to rotate freely, and the buffer column 2 will not be obstructed when it bounces down.
[0025] This device can be used in elevators as well as other applications requiring buffer protection.
Claims
1. A trigger type elevator buffer device provided on a car frame, comprising a housing (1), characterized in that: The shell (1) is internally provided with a buffer column (2) axially slidingly fitted with the shell (1), the lower end of the buffer column (2) is provided with a buffer (21), the buffer column (2) and the shell (1) are provided with a spring (3) enabling the buffer column (2) to be bounced downward, the buffer column (2) is hingedly provided with a lock tooth (22), the lock tooth (22) and the buffer column (2) are provided with a lock tooth spring (23), the lock tooth (22) is connected with a lower end connected with the lock tooth (22) and an upper end extended outside the shell (1) of an unlocking reset pull rope (24), the sidewall of the shell (1) is provided with a plurality of one-way teeth (11) matched with the lock tooth (22) and enabling the buffer (21) to be bounced downward and not to be retracted upward, the sidewall of the shell (1) is radially provided with a locking pin hole (12), the locking pin hole (12) is internally slidingly provided with a locking pin (13), the outer wall of the buffer column (2) is provided with a lock slot (25) matched with the locking pin (12) when the buffer (21) is retracted upward, the shell (1) is externally provided with a swing arm (4) hingedly provided on the shell (1), the swing arm (4) is hingedly connected with the end of the locking pin (13) located outside the shell (1), the swing arm (4) and the shell (1) are provided with a swing arm spring (41), the swing arm (4) is connected with a trigger pull rope or a pull rod (42) matched with a car safety clamp lifting arm.
2. A trigger type elevator cushioning device provided on a car frame according to claim 1, characterized in that The shell (1) is a cylindrical body, the buffer column (2) is a cylindrical body, the inner wall of the shell (1) at the position above the buffer (21) is provided with a lower supporting sleeve (14) axially slidingly fitted with the outer wall of the buffer column (2), the outer wall of the buffer column (2) below the lock slot (25) is provided with an upper supporting sleeve (26) axially slidingly fitted with the inner wall of the shell (1).
3. A trigger type elevator cushioning device installed on a car frame according to claim 1, wherein The buffer (21) is a polyurethane column or a rubber column with the upper end fixedly installed on the lower end face of the buffer column (2) and the lower end directed downward.
4. The triggered elevator cushioning device mounted on a car frame according to claim 1, characterized in that The spring (3) is a compression spring provided in the shell, the upper end of the shell (1) is provided with an end cover (15), the upper end face of the spring (3) is matched with the end cover (15) and externally sleeved on an upper positioning table (16) provided on the lower surface of the end cover (15), the lower end face of the spring (3) is matched with the buffer column (2) and externally sleeved on a lower positioning table (27) provided on the upper end face of the buffer column (2), the axial positions of the buffer column (2) above the lock tooth (22) and the shell end cover (15) are respectively provided with through holes in the axial direction, the lower end of the unlocking reset pull rope (24) is connected with the position of the lock tooth (22) away from the hinge shaft, the upper end is sequentially passed through the through hole of the buffer column (2), the spring (3) and the through hole of the shell end cover (15) from the lower end to the upper end and extended to the upper position of the shell (1); the spring (3) is a tension spring with the upper end connected with the buffer column (2) and the lower end connected with the shell (1), enabling the buffer column (2) to be bounced downward.
5. The triggered elevator cushioning device mounted on a car frame according to claim 1, characterized in that The middle part of the buffer column (2) is provided with a lock tooth installation groove (28), the lower end of the lock tooth (22) is hingedly connected with the buffer column (2) through a hinge shaft, the lock tooth spring (23) is a torsion spring with one end matched with the lock tooth (22) and the other end matched with the buffer column (2) and sleeved on the hinge shaft.
6. The triggered elevator cushioning device mounted on a car frame according to claim 1, characterized in that The side wall of the shell (1) is provided with a rack slot (17) in the position matched with the lock tooth (22) along the axial direction, and the rack slot (17) is provided with a rack (18) with a plurality of one-way teeth (11).
7. The triggered elevator cushioning device mounted on a car frame according to claim 1, characterized in that The lower side of the end matched with the lock slot (25) of the lock pin (13) is provided with a buffer column (2) inclined to the axial direction of the lock pin (13) to push the lock pin (25) out of the elastic inclined surface (19) when reset upward, and the buffer column (2) is provided with an inclined pushing surface (29) matched with the inclined surface (19).
8. The triggered elevator cushioning device mounted on a car frame according to claim 1, characterized in that The swing arm (4) is an L-shaped body, the swing arm (4) is hinged to the shell (1) at the turning position, one free end of the swing arm (4) is hinged to the lock pin (13) downward, the other free end is transversely connected to the trigger pull rope or pull rod (42) in the direction away from the axis of the shell (1), and the swing arm spring (41) is a torsion spring sleeved on the hinge shaft, one end of which is matched with the swing arm (4) and the other end is matched with the shell (1).
9. The triggered elevator cushioning device mounted on a car frame according to claim 1, characterized in that The top of the shell (1) is provided with a buffer column reset device (5) matched with the unlocking reset pull rope (24), the buffer column reset device (5) is composed of a winch (51), a winch seat (52) and a crank (53), the winch seat (52) is fixedly installed on the shell (1), the winch (51) is rotatably installed on the winch seat (52), the upper end of the unlocking reset pull rope (24) is connected and wound on the winch (51), one end surface of the winch (51) is provided with a square crank hole (54) inserted and matched with the crank (53), and the crank (53) is provided with a square head (55) matched with the crank hole (54).
10. A trigger type elevator cushioning device installed on a car frame according to claim 9, characterized in that One end of the winch (51) is provided with a ratchet wheel (56), the winch seat (52) is provided with a ratchet (57) and a ratchet seat plate (58), the ratchet seat plate (58) is hinged to the winch seat (52), a clutch spring (59) having one end matched with the ratchet seat plate (58) and the other end matched with the winch seat (52) is arranged between the ratchet seat plate (58) and the winch seat (52), the ratchet (57) is hinged to the ratchet seat plate (58) and matched with the ratchet wheel (56), a ratchet torsion spring (60) having one end matched with the ratchet (57) and the other end matched with the ratchet seat plate (58) is sleeved on the hinge shaft of the ratchet (57) and the ratchet seat plate (58), the crank (53) is provided with a clutch cylinder (61) adjacent to the square head (55) to push the ratchet seat plate (58) to rotate an angle when the square head (55) is inserted into the crank hole (54), so that the ratchet (57) is matched with the ratchet wheel (56), a transition round table (62) with a diameter gradually increasing from small to large is arranged between the square head (55) and the clutch cylinder (61), the ratchet seat plate (58) is provided with a clutch protrusion (63) protruding out of the ratchet seat plate (58) and matched with the transition round table (62) and the clutch cylinder (61) on the crank (53).