CN211496706U - Novel safe fast descending device - Google Patents
Novel safe fast descending device Download PDFInfo
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- CN211496706U CN211496706U CN201922250240.8U CN201922250240U CN211496706U CN 211496706 U CN211496706 U CN 211496706U CN 201922250240 U CN201922250240 U CN 201922250240U CN 211496706 U CN211496706 U CN 211496706U
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Abstract
The utility model relates to the technical field of rescue and escape devices, in particular to a novel safe quick-descending device, which comprises a shell, a central shaft, a winding drum and a traction rope wound on the winding drum, wherein the central shaft is rotatably arranged in the shell, and the winding drum is rotatably arranged on the central shaft; the speed limiting device comprises a winding drum, and is characterized by further comprising a speed reducing mechanism, a speed limiting mechanism and a recovery mechanism for recovering a traction rope, wherein the speed reducing mechanism comprises two sets of planetary mechanisms which are respectively arranged on two sides of the winding drum, each planetary mechanism comprises a left sun gear, a left planetary wheel carrier, a left planetary wheel, a right sun gear, a right planetary wheel carrier and a right planetary wheel, the right sun gear is fixedly arranged on the shell, the left sun gear is fixedly arranged on the central shaft, a plurality of connecting rods are fixedly arranged between the left planetary wheel carrier and the right planetary wheel carrier, and the connecting rods penetrate through the. The utility model discloses a reduction ratio design and whole atress are more reasonable, and the utility model provides the high safe design coefficient.
Description
Technical Field
The utility model relates to a rescue escape device technical field, concretely relates to novel safe fast drop device for the safety when high-rise building is because of accidents such as conflagration take place flees.
Background
In recent years, disastrous events of high-rise buildings frequently cause great threats to the safety of lives and properties of people, such as earthquakes, fires and the like. When a disaster happens, the safety quick-falling device can quickly evacuate people from a high-rise to the ground so as to obtain rescue.
The applicant of the present invention applied a chinese patent before: a safety speed-reducing device (application number: 201910889664.0) comprises a shell, a central shaft, a winding drum and a traction rope wound on the winding drum, wherein a speed reducing mechanism connected with the winding drum is arranged on the central shaft, and the safety speed-reducing device is also provided with a speed limiting mechanism and a recovery mechanism.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a novel safe fast device that falls to reach the speed and fall the purpose that the whole atress of in-process device is more reasonable, factor of safety is higher.
To achieve the above object, the present invention provides the following technical solutions: the utility model provides a novel safe fast device that falls, includes shell, center pin, reel and the haulage rope of coiling on the reel, the center pin rotationally sets up in the shell, the reel rotationally sets up on the center pin, still includes:
the speed reducing mechanism comprises a left planetary mechanism and a right planetary mechanism which are respectively arranged on two sides of the winding drum, the left planetary mechanism comprises a left sun wheel, a left planetary wheel frame and three left planetary wheels arranged on the left planetary wheel frame, and the left planetary wheels are respectively meshed with the left sun wheel; the right planetary mechanism comprises a right sun gear, a right planetary wheel frame and three right planetary wheels arranged on the right planetary wheel frame, and the right planetary wheels are respectively meshed with the right sun gear; the right sun gear is fixedly arranged on the shell, the left sun gear is fixedly arranged on the central shaft, a plurality of connecting rods are fixedly arranged between the left planet wheel carrier and the right planet wheel carrier, and the connecting rods penetrate through the winding drum, so that the winding drum drives the left planet wheel carrier and the right planet wheel carrier to rotate when rotating;
the speed limiting mechanism comprises a first-stage speed limiting device, a second-stage speed limiting device and an overrunning clutch; and
and the recovery mechanism is used for recovering the traction rope.
The reel can slide left and right along the connecting rod; the surface of the central shaft is provided with a circle of elliptic profiling grooves, the winding drum is rotatably arranged on the central shaft through a thrust ball bearing, and balls matched with the elliptic profiling grooves are embedded in the inner surface of the thrust ball bearing.
The further arrangement is that two ends of the central shaft are respectively provided with a conical ball bearing, the outer ring of the conical ball bearing at the left end of the central shaft is fixed on the shell, and the outer ring of the conical ball bearing at the right end of the central shaft is fixed in the central hole of the right sun gear.
The device is further arranged in that the first-stage speed limiting device and the second-stage speed limiting device respectively comprise an inner friction plate fixing disc, a speed-limiting outer friction plate and a plurality of speed-limiting inner friction plates which are uniformly distributed at the edge of the inner friction plate fixing disc, the speed-limiting inner friction plates are rotatably arranged on the inner friction plate fixing disc through fixing pins, and an extension spring is radially connected between the speed-limiting inner friction plates and the inner friction plate fixing disc; the speed-limiting outer friction plate is annular and is fixedly arranged on the outer shell and corresponds to the speed-limiting inner friction plate;
the inner rings of the inner friction plate fixing discs of the first-stage speed limiting device and the second-stage speed limiting device are respectively arranged outside the left planet carrier and the right planet carrier.
The device is further arranged in that a first one-way bearing is arranged between the inner friction plate fixing disc of the first-stage speed limiting device and the left planet carrier, a second one-way bearing is arranged between the inner friction plate fixing disc of the second-stage speed limiting device and the right planet carrier, and the rotating directions of the first one-way bearing and the second one-way bearing are the same as the rotating direction of the winding drum when the winding drum releases the traction rope.
The overrunning clutch further comprises a clutch outer ring and a clutch disc, wherein the clutch outer ring is fixedly arranged on the shell, and teeth are arranged on the inner side surface of the clutch outer ring; the clutch disc is arranged on the central shaft, at least one wedge block is arranged on the clutch disc, the wedge block can slide along the radial direction of the clutch disc, teeth are arranged on the radial outer side of the wedge block, and the teeth of the wedge block are matched with the teeth of the outer ring of the clutch; and a clutch spring is arranged between the radial inner side of the wedge block and the opposite center of the clutch disc, so that the teeth of the wedge block are meshed with the teeth of the outer ring of the clutch when the clutch spring is stretched.
The clutch disc further comprises two wedges which are arranged along the center of the clutch disc in a centrosymmetric mode.
The clutch disc is further provided with a guide post, and the wedge block is provided with a sliding groove matched with the guide post, so that the wedge block can slide along the radial direction of the clutch disc; and a cover cap is arranged at the top end of the guide post.
The clutch disc is further provided with a third one-way bearing between the clutch disc and the central shaft, and the rotatable direction of the third one-way bearing is the same as the rotatable direction of the central shaft when the traction rope is released by the winding drum.
The recovery mechanism comprises a clockwork spring rotary disc and a coil spring, the clockwork spring rotary disc is fixedly arranged on the central shaft, one end of the coil spring is fixed on the clockwork spring rotary disc and enables the coil spring to be wound on the surface of the clockwork spring rotary disc, and the other end of the coil spring is arranged on the shell through a rotating shaft.
Compared with the prior art, the utility model, its beneficial effect lies in:
1. the utility model provides a pair of novel safe speed falls device has optimized planetary reduction gear's reduction ratio design, can change the reduction ratio in a flexible way under the limited condition of size, and the bilateral symmetry design of reduction gear and two-stage friction speed limiter makes the whole atress of device more reasonable.
2. The utility model discloses a speed-limiting mechanism comprises two-stage friction speed limit and freewheel clutch, and freewheel clutch can be emergency braking under the equal circumstances that became invalid of two-stage friction speed limit, has avoided the free fall non-incident that the two-stage friction speed limit leads to because of the friction inefficacy, has improved the safety design coefficient.
Drawings
Fig. 1 is a schematic diagram of the explosion structure of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
Fig. 3 is a schematic structural diagram of the speed reducing mechanism of the present invention.
Fig. 4 is an exploded view of the speed reducing mechanism of the present invention.
Fig. 5 is a schematic structural view of the first and second stage speed limiting devices of the present invention.
Fig. 6 is a schematic structural view of the first and second stage speed limiting devices of the present invention.
Fig. 7 is a schematic structural diagram of the overrunning clutch of the present invention.
Fig. 8 is an exploded view of the overrunning clutch of the present invention.
In the figure: 1. a central shaft 11, an elliptic profiling groove 12 and a conical ball bearing; 2. a drum, 22, a connecting rod; 3. a left planetary mechanism 31, a left sun wheel 32, a left planetary wheel 33 and a left planetary wheel frame; 4. a right planetary mechanism 41, a right sun gear 42, a right planetary gear 43 and a right planetary gear frame; 5. the speed-limiting device comprises a first-stage speed reducing device 51, a first one-way bearing 52, an internal friction fixing disc 53, a speed-limiting internal friction disc 54, a speed-limiting external friction disc 55, a fixing pin 56 and an extension spring; 6. a second-stage speed limiting device 61 and a second one-way bearing; 7. the overrunning clutch 71, the clutch outer ring 72, the clutch disc 73, the third one-way bearing 74, the wedge block 75 and the clutch spring; 8. a recovery mechanism 81, a spring rotating disc 82 and a coil spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further specifically described below by way of embodiments and with reference to the accompanying drawings.
Example (b): a novel safe speed-reducing device is shown in figures 1-7 and comprises a shell (not shown in the figures), a central shaft 1, a winding drum 2, a traction rope (not shown in the figures) wound on the winding drum 2, a speed reducing mechanism, a speed limiting mechanism and a recovery mechanism 8.
Wherein center pin 1 rotationally sets up in the shell, 1 surface of center pin is equipped with oval profile modeling recess 11 of round, reel 2 rotationally sets up on center pin 1 through thrust ball bearing, thrust ball bearing's internal surface inlays and is equipped with the ball that matches with oval profile modeling recess 11, make reel 2 remove about 1 last edge axial of center pin when rotating, guarantee that the position of human gravity traction force vertical center line remains unchanged when the speed drops, avoid descending in-process haulage rope to appear rocking, and can reciprocate evenly to wind on reel 2 when haulage rope retrieves.
The haulage rope can adopt wire rope in this embodiment the utility model discloses a high strength rope that also can be other materials in other embodiments.
The speed reducing mechanism comprises a left planetary mechanism 3 and a right planetary mechanism 4 which are respectively arranged on two sides of the winding drum, wherein the left planetary mechanism 3 comprises a left sun wheel 31, a left planetary wheel frame 33 and three left planetary wheels 32, the left planetary wheels 32 are uniformly arranged on the left planetary wheel frame 33 in a triangular shape, and the left sun wheel 31 is positioned among the three left planetary wheels 32 and is respectively meshed with the left planetary wheels 32; similarly, the right planetary mechanism 4 includes a right sun gear 41, a right planetary carrier 43, and three right planetary gears 42, and the right sun gear 41 is located between the three right planetary gears 42 and is engaged with the right planetary gears 42, respectively; the right sun gear 41 is fixedly arranged on the shell, and the left sun gear 31 is fixedly arranged on the central shaft 1 through key connection; three connecting rods 22 are fixedly arranged between the left planet carrier 33 and the right planet carrier 43, the three connecting rods 22 are uniformly distributed in a triangular shape and respectively penetrate through the winding drum 2, so that the winding drum 2 can drive the left planet carrier 33 and the right planet carrier 43 to rotate together when rotating. In order to ensure that the winding drum 2 can move left and right along the central shaft 1, the connecting rod 22 is in clearance fit with the winding drum 2, namely, the winding drum 2 can slide left and right along the connecting rod 22.
In the above configuration, the reduction ratio can be flexibly changed when the size is limited, and a large reduction ratio can be realized by changing the number of teeth of each gear. In this embodiment, the length of the pulling rope is below 30 m, and the number of teeth Z of the left sun gear 31 is set138, tooth number Z of left planetary gear 322Number of teeth Z of right sun gear 41 equal to 362’Number of teeth Z of right planetary gear 42 equal to 373The rotation speed ratio of the left sun gear 31 to the planetary carrier is obtained according to a planetary gear train calculation formula as 37:
that is, when the left and right planetary wheel carriers rotate 19 times, the left sun gear 31 drives the central shaft 1 to rotate 1 time, and the rotation direction is the same.
The number of teeth of each gear in the speed reducing mechanism in the embodiment is suitable for the traction rope with the length of 30 meters or less, if the length of the traction rope is greater than 30 meters, the number of teeth of each gear needs to be changed to increase the speed reducing ratio, and when the length of the traction rope is longer, the length of the coil spring in the recovery mechanism 8 is not too long as the speed reducing ratio is increased.
In this embodiment, the two ends of the central shaft 1 are respectively provided with the conical ball bearings 12, the outer ring of the conical ball bearing 12 at the left end is fixed on the housing, the outer ring of the conical ball bearing 12 at the right end is fixed in the central hole of the right sun gear 41, and when the winding drum 2 moves left and right, axial force is generated on the central shaft 1, and the conical ball bearings 12 can bear both radial force and axial force.
The speed limiting mechanism consists of a first-stage speed limiting device 5, a second-stage speed limiting device 6 and an overrunning clutch 7.
The first-stage speed limiting device and the second-stage speed limiting device are the same in structure and respectively comprise an inner friction plate fixed disc 52, a speed limiting outer friction plate 54 and a plurality of speed limiting inner friction plates 53 which are uniformly distributed on the edge of the inner friction plate fixed disc 52, the speed limiting inner friction plates 53 are rotatably arranged in the inner friction plate fixed disc 52 through fixed pins 55, and an extension spring 56 is radially connected between the speed limiting inner friction plates 53 and the inner friction plate fixed disc 52; the speed-limiting outer friction plate 54 is annular and is fixedly arranged on the outer shell and corresponds to the speed-limiting inner friction plate 53.
When the rotating speed exceeds the critical value of the speed limiting device, the centrifugal force enables the extension spring 56 to be extended to a certain length, the speed limiting inner friction plate 53 rotates around the fixed pin 55 and contacts with the inner surface of the speed limiting outer friction plate 54 with a certain pressure to generate frictional resistance, and therefore the braking effect is achieved; the higher the rotation speed, the greater the centrifugal force, the longer the extension spring 56 extends, the greater the sliding frictional resistance between the inner and outer friction plates, and the increase in rotation speed is restricted. The rate-limiting range can be changed by changing the coefficient of stiffness and the length of the tension spring 56, so that the coefficient of stiffness and the length of the tension spring 56 mounted in the two-stage rate-limiting device are different.
A first one-way bearing 51 is arranged between an inner friction plate fixed disc 52 of the first-stage speed limiting device 5 and the left planet carrier 33, a second one-way bearing 61 is arranged between an inner friction plate fixed disc of the second-stage speed limiting device 6 and the right planet carrier 43, and the rotating directions of the first one-way bearing 51 and the second one-way bearing 61 are the same as the rotating direction of the winding drum 2 when the winding drum 2 releases the traction rope. When the winding drum 2 releases the traction rope, the first-stage speed limiting device 5 and the second-stage speed limiting device 6 rotate along with the left planet carrier 33 and the right planet carrier 43 respectively, in the embodiment, through different designs of stiffness coefficients and lengths of the stretching springs in the first-stage speed limiting device 5 and the second-stage speed limiting device 6, when the descending speed of a human body reaches 1.8m/s, the first-stage speed limiting device 5 starts to work and increases along with the increase of the rotating speed, the sliding friction resistance is larger, and the increase of the rotating speed is limited; when the first-stage speed limiting device 5 is in friction failure and the descending speed of the human body is increased to 2.0m/s, the second-stage speed limiting device 6 starts to work to generate a braking effect and limit the increase of the rotating speed.
The overrunning clutch 7 comprises a clutch outer ring 71 and a clutch disc 72, wherein the clutch outer ring 71 is fixedly arranged on the shell, and teeth are arranged on the inner side surface of the clutch outer ring 71; the clutch disc 72 is arranged on the central shaft 1 by means of a third one-way bearing 73, the third one-way bearing 73 being rotatable in the same direction as the central shaft 1 when the reel 2 releases the traction rope.
The clutch disc 72 is provided with two wedges 74 in central symmetry, the wedges 74 can slide along the radial direction of the clutch disc 72, specifically, the clutch disc 72 is provided with two guide posts 76, the top ends of the guide posts 76 are provided with caps 77, the wedges 74 are provided with slide slots 78 matched with the guide posts 76, the guide posts 76 penetrate through the slide slots 78 and then are covered with the caps 77 to limit the degree of freedom of the wedges 74 in the length direction of the guide posts 76, and the arrangement can enable the wedges 74 to slide linearly on the clutch disc 72.
The radial outer side of the wedge block 74 is provided with teeth, and the teeth of the wedge block 74 are matched with the teeth of the clutch outer ring 71; a clutch spring 75 is arranged between the radial inner side of the wedge 74 and the relative center of the clutch disc 72, when the overrunning clutch 7 rotates along with the central shaft 1, the centrifugal force causes the clutch spring 75 to be stretched, the larger the centrifugal force is, the longer the elongation of the clutch spring 75 is until the teeth of the wedge 74 and the teeth of the clutch outer ring 71 are mutually jointed, the rotating speed of the clutch disc 72 is rapidly zero under the constraint of the zero rotating speed of the clutch outer ring 71, the central shaft 1 is locked, and then the speed reducing mechanism is locked to stop descending.
By designing the stiffness coefficient and the length of the clutch spring 75, when the friction failure occurs in the first-stage speed limiting device 5 and the second-stage speed limiting device 6 and the descending speed of a human body is increased to 2.2m/s, the wedge block 74 overcomes the pulling force of the clutch spring 75 and is jointed with the outer ring 71 of the clutch under the action of centrifugal force, so that emergency braking is realized, at the moment, the extension springs in the first-stage speed limiting device 5 and the second-stage speed limiting device 6 return to the original positions, and the two-stage speed limiting devices are temporarily in a non-working state; then, the wedge 74 is returned to the original position by the tensile force of the clutch spring 75, and is disengaged from the clutch outer 71, and the lowering operation is resumed by the weight of the human body.
The recovery mechanism 8 includes a clockwork spring rotary plate 81 and a coil spring 82, the clockwork spring rotary plate 81 is fixedly provided on the center shaft 1, one end of the coil spring 82 is fixed to the clockwork spring rotary plate 81, and the coil spring 82 is wound around the surface of the clockwork spring rotary plate 81, and the other end is wound around a rotary shaft provided on the housing. When the human body descends rapidly, the spring rotating disc 81 rotates along with the central shaft 1, the coil spring 82 is wound on the surface of the spring rotating disc 81, and the elastic force of the coil spring 82 can absorb part of the human body potential energy. When people safely fall to the ground, the traction rope is loosened, the spring coiling 82 pulls the spring rotating disc 81 to rotate reversely under the action of elastic deformation restoring force, the central shaft 1 is driven to rotate reversely, at the moment, the first one-way bearing 51, the second one-way bearing 61 and the winding drum 2 move relatively, the third one-way bearing 73 and the central shaft 1 move relatively, namely, the inner rings of the three one-way bearings rotate, but the outer rings of the three one-way bearings do not move, so that the two-stage speed limiting device and the overrunning clutch 7 do not work; the central shaft 1 drives the left sun gear 31 to rotate reversely, and the planetary reduction mechanism becomes an accelerating device at the moment, so that the winding drum 2 rotates reversely at a high speed, and meanwhile, the winding drum 2 moves left and right along the axial direction of the central shaft 1, so that the traction rope is wound on the winding drum 2 quickly and uniformly, the recovery work of the traction rope is completed, and the next person in a high-rise building can escape.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. The utility model provides a novel safe fast device that falls, includes shell, center pin, reel and the haulage rope of coiling on the reel, the center pin rotationally sets up in the shell, the reel rotationally sets up on the center pin, its characterized in that still includes:
the speed reducing mechanism comprises a left planetary mechanism and a right planetary mechanism which are respectively arranged on two sides of the winding drum, the left planetary mechanism comprises a left sun wheel, a left planetary wheel frame and three left planetary wheels arranged on the left planetary wheel frame, and the left planetary wheels are respectively meshed with the left sun wheel; the right planetary mechanism comprises a right sun gear, a right planetary wheel frame and three right planetary wheels arranged on the right planetary wheel frame, and the right planetary wheels are respectively meshed with the right sun gear; the right sun gear is fixedly arranged on the shell, the left sun gear is fixedly arranged on the central shaft, a plurality of connecting rods are fixedly arranged between the left planet wheel carrier and the right planet wheel carrier, and the connecting rods penetrate through the winding drum, so that the winding drum drives the left planet wheel carrier and the right planet wheel carrier to rotate when rotating;
the speed limiting mechanism comprises a first-stage speed limiting device, a second-stage speed limiting device and an overrunning clutch; and
and the recovery mechanism is used for recovering the traction rope.
2. The novel safety speed reduction device as claimed in claim 1, wherein the winding drum can slide left and right along the connecting rod; the surface of the central shaft is provided with a circle of elliptic profiling grooves, the winding drum is rotatably arranged on the central shaft through a thrust ball bearing, and balls matched with the elliptic profiling grooves are embedded in the inner surface of the thrust ball bearing.
3. A novel safe speed reduction device according to claim 1, wherein conical ball bearings are respectively arranged at two ends of the central shaft, the left conical ball bearing outer ring is fixed on the shell, and the right conical ball bearing outer ring is fixed in the central hole of the right sun gear.
4. The novel safe speed reduction device according to claim 1, wherein the first-stage speed limiting device and the second-stage speed limiting device respectively comprise an inner friction plate fixing disc, a speed-limiting outer friction plate and a plurality of speed-limiting inner friction plates uniformly distributed at the edge of the inner friction plate fixing disc, the speed-limiting inner friction plates are rotatably arranged on the inner friction plate fixing disc through fixing pins, and a tension spring is radially connected between the speed-limiting inner friction plates and the inner friction plate fixing disc; the speed-limiting outer friction plate is annular and is fixedly arranged on the outer shell and corresponds to the speed-limiting inner friction plate;
the inner rings of the inner friction plate fixing discs of the first-stage speed limiting device and the second-stage speed limiting device are respectively arranged outside the left planet carrier and the right planet carrier.
5. A novel safe speed reduction device according to claim 4, characterized in that a first one-way bearing is arranged between the inner friction plate fixing disc of the first-stage speed limiting device and the left planet carrier, a second one-way bearing is arranged between the inner friction plate fixing disc of the second-stage speed limiting device and the right planet carrier, and the rotatable directions of the first one-way bearing and the second one-way bearing are the same as the rotatable direction of the winding drum when the winding drum releases the traction rope.
6. The novel safe speed reduction device according to claim 1, characterized in that the overrunning clutch comprises a clutch outer ring and a clutch disc, the clutch outer ring is fixedly arranged on a shell, and the inner side surface of the clutch outer ring is provided with teeth; the clutch disc is arranged on the central shaft, at least one wedge block is arranged on the clutch disc, the wedge block can slide along the radial direction of the clutch disc, teeth are arranged on the radial outer side of the wedge block, and the teeth of the wedge block are matched with the teeth of the outer ring of the clutch; and a clutch spring is arranged between the radial inner side of the wedge block and the opposite center of the clutch disc, so that the teeth of the wedge block are meshed with the teeth of the outer ring of the clutch when the clutch spring is stretched.
7. A novel safe speed reduction device according to claim 6, characterized in that the number of the wedges is two, and the wedges are arranged along the center of the clutch disc in a central symmetry manner.
8. A novel safe speed reduction device according to claim 6 or 7, characterized in that the clutch disc is provided with guide posts, and the wedge block is provided with sliding grooves matched with the guide posts, so that the wedge block can slide along the radial direction of the clutch disc; and a cover cap is arranged at the top end of the guide post.
9. A novel safety speed reduction device according to claim 6, characterized in that a third one-way bearing is arranged between the clutch disc and the central shaft, and the rotational direction of the third one-way bearing is the same as the rotational direction of the central shaft when the traction rope is released from the winding drum.
10. The novel safe speed reduction device according to claim 1, wherein the recovery mechanism comprises a spring rotating disc and a coil spring, the spring rotating disc is fixedly arranged on the central shaft, one end of the coil spring is fixed on the spring rotating disc, the coil spring is enabled to be wound on the surface of the spring rotating disc, and the other end of the coil spring is arranged on the shell through a rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922250240.8U CN211496706U (en) | 2019-12-16 | 2019-12-16 | Novel safe fast descending device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922250240.8U CN211496706U (en) | 2019-12-16 | 2019-12-16 | Novel safe fast descending device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211496706U true CN211496706U (en) | 2020-09-15 |
Family
ID=72416059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922250240.8U Withdrawn - After Issue CN211496706U (en) | 2019-12-16 | 2019-12-16 | Novel safe fast descending device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211496706U (en) |
-
2019
- 2019-12-16 CN CN201922250240.8U patent/CN211496706U/en not_active Withdrawn - After Issue
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