CN209959163U

CN209959163U - Telescopic sleeve and ladder telescopic foot

Info

Publication number: CN209959163U
Application number: CN201920320551.4U
Authority: CN
Inventors: 张钊
Original assignee: DONGGUAN WEIXIN SPORTS ARTICLES Co Ltd
Current assignee: Guangdong Qunwang Technology Co ltd
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2020-01-17
Anticipated expiration: 2029-03-13

Abstract

The utility model discloses a telescopic sleeve, which comprises an inner pipe, an outer pipe and a lock releasing mechanism, wherein the inner pipe and the outer pipe are sleeved and slide with each other, and the lock releasing mechanism is arranged in the inner pipe and comprises a driving piece, a seat body, a middle shaft, a swing arm and a locking pin; the seat body is fixed on the inner tube, the middle part of the swing arm is pivoted to the seat body through the middle shaft, the locking pin is arranged in a sliding mode and can extend out of the outer side of the inner tube, the outer tube is provided with a locking hole, the driving piece is arranged in the inner tube in a sliding mode and drives the swing arm to swing, the other end of the swing arm drives the locking pin to be inserted into or withdrawn from the locking hole, and therefore the inner tube and the outer tube can be locked or unlocked mutually. The utility model discloses a telescopic tube can slide each other after the release lock and expand or realize the locking after the slip shrink, reduces sheathed tube occupation space, easy operation, convenient to use. In addition, the utility model discloses still disclose a saving space, conveniently deposit and carry, and the flexible foot of ladder pleasing to the eye.

Description

Telescopic sleeve and ladder telescopic foot

Technical Field

The utility model relates to a ladder especially relates to a telescopic tube and flexible foot of ladder.

Background

The ladder foot of extension ladder is generally all fixed, and the width of ladder body and ladder foot equals, and when the shrink, each section ladder post of ladder body all collapsible one section ladder post of lower extreme in to make the extension ladder fold up the minimum state, greatly improve the convenience of transportation. However, these extension ladders are not stable in use because of the small width and support range of the ladder legs. If only the ladder feet of the existing extension ladder are lengthened, the supporting range is enlarged, the supporting stability can be improved, but the ladder feet are fixed and can not be folded, so that the space occupied by the folded ladder feet is too large, and the extension ladder is not beneficial to transportation and storage. In addition, although some extension ladders with expandable or collapsible ladder legs exist, the ladder legs of the extension ladders are complex in structure and exposed, so that the operation is inconvenient and the appearance is not attractive.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a telescopic tube, it sets up the release mechanism in inside for can slide each other after the release and expand or realize the locking after the slip shrink, reduce sheathed tube occupation space, easy operation, convenient to use.

Another object of the present invention is to provide a telescopic foot of ladder, which can extend out of the foot support to support the ladder, so as to make the ladder more stable, or to be retracted when not in use, so as to save space, facilitate storage and carrying, and have an attractive appearance.

In order to achieve the above object, the telescopic tube of the present invention comprises an inner tube, an outer tube, and a lock releasing mechanism, wherein the inner tube and the outer tube are sleeved and slid with each other, and the lock releasing mechanism is arranged in the inner tube and comprises a driving member, a seat body, a middle shaft, a swing arm and a locking pin; the seat body is fixed on the inner tube, the middle part of the swing arm is pivoted to the seat body through the middle shaft, the locking pin is arranged in a sliding mode and can extend out of the outer side of the inner tube, the outer tube is provided with a locking hole, the driving piece is arranged in the inner tube in a sliding mode and drives the swing arm to swing, the other end of the swing arm drives the locking pin to be inserted into or withdrawn from the locking hole, and therefore the inner tube and the outer tube can be locked or unlocked mutually.

Compared with the prior art, the inner tube and the outer tube slide mutually, the swing arm is arranged on the seat body by using the middle shaft, the locking pin is arranged on the inner tube in a sliding way and can extend out of the inner tube, and the swing arm is driven by using a driving piece, so that the swing arm swings and drives the locking pin to be inserted into the locking hole of the outer tube, and further the relative positions of the inner tube and the outer tube are locked, and the aim of locking the inner tube and the outer tube after being unfolded or contracted is fulfilled; the occupied space can be reduced after the inner pipe and the outer pipe are contracted and locked, only the driving piece needs to be driven to act when the device is used, the operation is simple, and the use is convenient; in addition, the lock release mechanism is arranged in the inner tube, so that the lock release mechanism can be prevented from being exposed, and the whole body is more attractive.

Preferably, the lock release mechanism further comprises a driving rod, one end of the driving rod is connected with the driving piece, and the other end of the driving rod extends out of the outer pipe. Because the driving piece is located in the inner tube, the driving rod is arranged, and the driving rod extends to the outer tube, so that the operation of a user can be facilitated, and the use convenience is improved.

Specifically, the lock release mechanism further comprises an operating button, and the operating button is connected to the other end of the driving piece so as to enable the driving rod to push the driving piece to slide through pressing.

Preferably, the lock release mechanism further includes a first elastic member that provides an elastic force to insert the locking pin into the locking hole. The first elastic piece can enable the locking pin to be automatically inserted into the locking hole, and then the inner pipe and the outer pipe are automatically locked.

Specifically, the first elastic element is a torsion spring, and the torsion spring is sleeved on the middle shaft and abuts against the swing arm.

Preferably, the inner wall of the outer tube is provided with a fixing rod extending along the sliding direction of the inner tube, and the locking hole is formed in the fixing rod. The fixing rod is arranged, the locking hole is formed in the fixing rod, the locking hole can be prevented from being formed in the outer tube, and the attractiveness of the outer tube is improved.

Preferably, the outer side of the inner tube is provided with a sliding groove, the inner wall of the outer tube is provided with a sliding block, and the sliding block is slidably arranged on the sliding groove. The sliding groove is matched with the sliding block, so that the inner tube can slide more stably and accurately.

Preferably, the central axis of the locking pin is perpendicular to the central axis.

Specifically, the lock releasing mechanism further comprises a connecting shaft, the connecting shaft is connected with the locking pin, the base body is provided with a long hole extending along the sliding direction of the locking pin, the other end of the swing arm is provided with a driving inclined hole inclined relative to the long hole, and the connecting shaft is parallel to the middle shaft and penetrates through the driving inclined hole and the long hole in a sliding mode. Through setting up connecting axle and drive inclined hole, can make the swing power of swing arm converts into the drive the stop pin to the gliding axial thrust in locking hole realizes the stop pin to the locking of inner tube and outer tube.

The telescopic foot of the ladder comprises a foot support and a telescopic sleeve, wherein the foot support is connected to the outer end of an inner tube.

Preferably, the foot support has a mounting seat mounted within an outer end of the inner tube.

Specifically, the flexible foot of ladder still includes callus on the sole and branch, be on the heel brace and be equipped with the regulation hole vertically, branch slidable adjustment set up in the regulation hole, and the lower extreme with the callus on the sole is connected.

Specifically, the ladder telescopic foot further comprises a locking mechanism, and the locking mechanism is clamped with the support rod to lock the foot pad.

Specifically, the locking mechanism comprises a locking piece, a driving shaft and an operating piece, a through hole communicated with the adjusting hole is formed in one side of the mounting seat, the driving shaft is pivoted on the mounting seat, a pivoting center shaft is perpendicular to a center shaft of the adjusting hole, two ends of the driving shaft extend out of the outer tube to be connected with the operating piece, the locking piece is fixed on the driving shaft, and the driving shaft can drive the locking piece to extend into the adjusting hole or withdraw from the adjusting hole through the through hole so as to be clamped with or separated from the supporting rod.

Specifically, the locking mechanism further comprises a second elastic member, and the second elastic member provides an elastic force for enabling the locking member to exit the adjusting hole. Through setting up the second elastic component, can make the locking piece automatically with the branch block reaches the mesh of auto-lock.

Specifically, the second elastic part is a torsion spring, one end of the torsion spring abuts against the locking part, and the other end of the torsion spring abuts against the mounting seat.

Specifically, the locking piece is provided with clamping teeth, and the outer side of the supporting rod is provided with grains meshed with the clamping teeth.

Drawings

Fig. 1 is a schematic structural view of the extension ladder of the present invention.

Fig. 2 is an exploded view of the telescopic leg of the telescopic ladder of the present invention.

Fig. 3 is a sectional plan view showing the internal structure of the telescopic leg of the telescopic ladder of the present invention.

Fig. 4 is a sectional view of the foot pad and the locking mechanism of fig. 3.

Fig. 5 is a sectional side view of the telescopic leg of the telescopic ladder of the present invention.

Fig. 6 is an enlarged view of a portion a in fig. 5.

Fig. 7 is a cross-sectional structural view of the release mechanism of fig. 3.

Fig. 8 is an enlarged view of a portion B in fig. 5.

Fig. 9 is a state diagram of the extension ladder of the present invention when the sub-extension legs are extended.

Detailed Description

In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

As shown in fig. 1 and 2, the utility model discloses an extension ladder 100, it includes telescopic ladder body 101 and the double-phase ladder extension foot 102 that sets up relatively, ladder extension foot 102 includes heel brace 1 and extension tube 2, extension tube 2 includes inner tube 21 and outer tube 22, the transversal I-shaped structure of personally submitting of inner tube 21, inner tube 21 cup joint in the outer tube 22 and relative outer tube 22 stretches out or retracts in slidable, heel brace 1 has mount pad 11, mount pad 11 install in the outer end of inner tube 21, so that heel brace 1 is fixed in outside inner tube 21.

As shown in fig. 2, 3 and 4, the telescopic foot 102 of the ladder further includes a foot pad 3, a support rod 4 and a locking mechanism 5, an adjusting hole 1a is vertically formed in the foot rest 1, a central axis of the adjusting hole 1a is perpendicular to a sliding direction of the inner tube 21, the support rod 4 is slidably and adjustably disposed in the adjusting hole 1a, and a lower end of the support rod is connected with the foot pad 3 through a ball joint, so that the foot pad 3 can be completely matched with a support surface when the telescopic ladder is used in an inclined manner. The locking mechanism 5 is engaged with the support rod 4 to lock the foot pad 3.

Referring to fig. 4, 5 and 6, in particular, the locking mechanism 5 includes a locking member 51, a driving shaft 52, an operating member 53 and a second elastic member 54. One side of the mounting seat 11 is provided with an accommodating cavity 11a and a through hole communicating the adjusting hole 1a and the accommodating cavity 11a, and the driving shaft 52 is pivoted on the mounting seat 11 and the pivoting shaft is perpendicular to the central shaft of the adjusting hole 1 a. The two ends of the driving shaft 52 extend out of the outer tube 22 and are fixedly connected with the operating member 53, and the operating member 53 is a pedal. The locking member 51 is fixed to the driving shaft 52 and is disposed in the receiving chamber 11 a. The second elastic member provides an elastic force for enabling the locking member 51 to exit the adjusting hole 1a, specifically, the second elastic member 54 is a torsion spring, the torsion spring is sleeved on the driving shaft 52 and is arranged in the accommodating cavity 11a, one end of the torsion spring abuts against the locking member 51, and the other end of the torsion spring abuts against the mounting seat 11. By providing the second elastic member 54, the locking member 51 can be automatically engaged with the strut 4, thereby achieving the purpose of self-locking. Under the elastic force drive of the torsion spring, the driving shaft 52 rotates positively to drive the locking piece 51 to extend into the adjusting hole 1a through the through hole so as to be clamped with the support rod 4; or the operating piece 53 is operated to make the driving shaft 52 rotate reversely and drive the locking piece 51 to exit the adjusting hole 1a so as to be separated from the supporting rod 4. The locking piece 51 is provided with a clamping tooth 51a, the outer side of the support rod 4 is provided with a line 4a, and when the support rod 4 is locked, the clamping tooth 51a is meshed with the line 4 a. Through setting up locking mechanical system 5, locking piece 51 with branch 4 can block or break away from to can make branch 4 can be in adjust any one height in the hole 1a, reach the purpose of regulation, and only need operate operating parts 53 can the unblock, convenience simple to use.

Referring to fig. 2, fig. 3, fig. 7 and fig. 8, the telescopic tube 2 further includes a lock releasing mechanism 23 disposed in the inner tube 21, wherein the lock releasing mechanism 23 includes a driving member 231, a seat 232, a central shaft 233, four swing arms 234, two locking pins 235 and two connecting shafts 236; the base 232 is fixed to the inner tube 21, the swing arms 234 are of a bent structure, the swing arms 234 are arranged in an upper direction and a lower direction, the two swing arms 234 on the upper side are symmetrically arranged, the two swing arms 234 on the lower side are symmetrically arranged, the upper swing arm 234 and the lower swing arm 234 on the same side are correspondingly overlapped, one ends of the upper swing arm 234 and one end of the lower swing arm 234 on the same side are connected through a shaft pin 237, the middle parts of the four swing arms 234 are pivoted to the base 232 through the middle shafts 233, and the middle shafts 233 are perpendicular to the sliding direction of the inner tube 21. The locking pin 235 is slidably disposed and can extend out of the outer side of the inner tube 21, the other ends of the upper and lower swing arms 234 located on the same side are connected to the connecting shaft 236, and the connecting shaft 236 is connected to one locking pin 235; two sides of the outer tube 22 are provided with locking holes 22a, at least two locking holes 22a are arranged on the same side, and the two locking holes 22a are respectively arranged at two ends of the outer tube 22. The driving member 231 has a cross section matched with the inner tube 21, the driving member 231 is slidably disposed on the inner tube 21 and can abut against one end of the swing arm 234 to drive the swing arm 234 to swing, and the other end of the swing arm 234 can drive the locking pin 235 to be inserted into or withdrawn from the locking hole 22a, so as to achieve mutual locking or unlocking of the inner tube 21 and the outer tube 22. Specifically, the center axis of the locking pin 235 is perpendicular to the central axis 233. The middle portion of the connecting shaft 236 is connected to the locking pin 235, the base body 232 is provided with an elongated hole 232a extending along the sliding direction of the locking pin 235, the other end of the swing arm 234 is provided with a driving inclined hole 234a inclined relative to the elongated hole 232a, the connecting shaft 236 is parallel to the central shaft 233, and the upper and lower ends of the connecting shaft 236 are respectively slidably inserted into the driving inclined holes 234a of the upper and lower swing arms 234 and the two elongated holes 232a on the upper and lower sides of the base body 232. By providing the connecting shaft 236 and the driving inclined hole 234a, the swinging force of the swinging arm 234 can be converted into an axial thrust force for driving the locking pin 235 to slide toward the locking hole 22a, so that the locking pin 235 locks the inner tube 21 and the outer tube 22.

As shown in fig. 2 and 4, the lock releasing mechanism 23 further includes a driving rod 238, a U-shaped member 239, and an operation button 240, wherein one end of the driving rod 238 is connected to the driving member 231, the other end is connected to the U-shaped member 239, the U-shaped member 239 surrounds the mounting seat 11, the operation button 240 is connected to the U-shaped member 239, and the operation button 240 is disposed on a side surface of the foot support 1, so that the driving rod 238 pushes the driving member 231 to slide by pressing. Since the driving member 231 is located in the inner tube 21, the driving rod 238 is provided to extend the operation button 240 out of the outer tube 22, so that the operation of the user can be facilitated, and the convenience of use can be improved. In addition, the U-shaped member 239 has two long avoiding holes 239a on both sides for the driving shaft 52 to pass through, so that the U-shaped member 239 does not interfere with the driving shaft 52 when the operating button 240 is operated to drive the U-shaped member 239 to move and push the driving rod 238.

As further shown in fig. 7, the release mechanism 23 further includes a first elastic member 241, and the first elastic member 241 provides an elastic force for inserting the locking pin 235 into the locking hole 22 a. The first elastic member 241 enables the locking pin 235 to be automatically inserted into the locking hole 22a, so that the inner tube 21 and the outer tube 22 are automatically locked. Specifically, the first elastic member 241 is a torsion spring, which is sleeved on the central shaft 233 and abuts against a shaft pin 237 connecting the upper and lower swing arms 234. Therefore, only one torsion spring is required to drive the four swing arms 234.

In addition, referring to fig. 2, a sliding groove 21a is formed at an i-shaped recess at the outer side of the inner tube 21, a sliding block 22b is disposed on the inner wall of the outer tube 22, and the sliding block 22b is slidably disposed on the sliding groove 21 a. The sliding groove 21a and the sliding block 22b are matched, so that the inner tube 21 can slide more stably and accurately. The inner wall of the outer tube 22 is further provided with a fixing rod 22c extending along the sliding direction of the inner tube 21, the locking hole 22a is formed in the fixing rod 22c, and the fixing rod 22c is fixedly connected with the sliding block 22 b. The fixing rod 22c is provided, and the locking hole 22a is formed in the fixing rod 22c, so that the locking hole 22a is prevented from being opened outside the outer tube 22, and the appearance of the fixing rod is improved.

The operation of the telescopic foot 102 of the ladder of the present invention will be described in detail with reference to the above drawings and fig. 9, as follows:

when the ladder telescopic leg 102 needs to be extended, the operating button 240 is manually pressed, so that the operating button 240 pushes the U-shaped member 239, the U-shaped member 239 slides and pushes the driving rod 238, the driving rod 238 pushes the driving member 231 to slide towards the direction of the swing arms 234, when the driving member 231 presses one end of the swing arms 234, the four swing arms 234 rotate around the central shaft 233 and compress the first elastic member 241, so that the upper and lower swing arms 234 on the same side swing and simultaneously drive the connecting shaft 236 on the same side, and the connecting shaft 236 moves inwards in the direction of the elongated hole 232a under the combined action of the driving inclined hole 234a and the elongated hole 232a and pushes the locking pin 235 to move inwards, so that the locking pin 235 exits from the locking hole 22a of the outer tube 22 close to the inner end. At this time, the outer tube 22 and the inner tube 21 are unlocked from each other, and the inner tube 21 is pulled out and the operation button 240 is released. When the inner tube 21 is completely pulled out, the locking pin 235 faces the locking hole 22a near the outer end of the outer tube 22, and at this time, under the elastic restoring force of the first elastic member 241, the swing arm 234 rotates and drives the connecting shaft 236 to move outwards, so that the locking pin 235 is driven to be inserted into the locking hole 22a, and at the same time, one end of the swing arm 234 pushes the driving member 231 backwards, and the driving member 231 drives the operating button 240 to reset through the driving rod 238 and the U-shaped member 239. At this time, the inner tube 21 is in an extended state and interlocked with the outer tube 22. When the ladder telescopic leg 102 needs to be retracted, the operating button 240 needs to be manually pressed, the lock release mechanism 23 unlocks the inner tube 21 and the outer tube 22 again, then the inner tube 21 is pushed towards the inner portion of the outer tube 22, so that the inner tube 21 is completely placed in the outer tube 22, and finally the lock release mechanism 23 automatically locks the inner tube 21 and the outer tube 22 again to complete folding.

When the foot pad 3 needs to be used, only the operation piece 53 needs to be operated, the operation piece 53 drives the driving shaft 52 to rotate and compress the second elastic piece 54, the driving shaft 52 drives the locking piece 51 to rotate, so that the lower end of the locking piece 51 exits from the adjusting hole 1a, at this time, the supporting rod 4 connected with the foot pad 3 is inserted into the adjusting hole 1a and the operation piece 53 is released after the height is adjusted, the locking piece 51 rotates again under the restoring force of the second elastic piece 54, so that the lower end of the locking piece enters the adjusting hole 1a and the clamping teeth 51a are clamped with the lines 4a on the supporting rod 4, and the supporting rod 4 is locked. At this time, the foot pad 3 can be mounted.

Compared with the prior art, the lock release mechanism 23 is arranged in the inner tube 21, the inner tube 21 and the outer tube 22 slide with each other, the swing arm 234 is arranged on the seat body 232 by using the central shaft 233, the locking pin 235 is arranged on the inner tube 21 in a sliding manner and can extend out of the inner tube 21, and the swing arm 234 is driven by using the driving piece 231, so that the swing arm 234 swings and drives the locking pin 235 to be inserted into the locking hole 22a of the outer tube 22, and further the relative positions of the inner tube 21 and the outer tube 22 are locked, so that the inner tube 21 and the outer tube 22 can be locked after being unfolded or contracted; the occupied space can be reduced after the inner tube 21 and the outer tube 22 are contracted and locked, and only the driving piece 231 needs to be driven to act when the device is used, so that the device is simple to operate and convenient to use; in addition, by disposing the lock release mechanism 23 in the inner tube 21, exposure thereof can be avoided. Therefore, the entire telescopic leg 102 of the ladder can be extended to support the ladder when in use, so that the ladder is more stable, or retracted when not in use, so as to save space, facilitate storage and carrying, and have an attractive appearance.

The above disclosure is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereto, and therefore, the scope of the present invention is not limited to the above embodiments.

Claims

1. The utility model provides a telescopic tube, includes that cup joint gliding inner tube and outer tube each other, its characterized in that: the lock releasing mechanism is arranged in the inner tube and comprises a driving piece, a seat body, a middle shaft, a swing arm and a locking pin; the seat body is fixed on the inner tube, the middle part of the swing arm is pivoted to the seat body through the middle shaft, the locking pin is arranged in a sliding mode and can extend out of the outer side of the inner tube, the outer tube is provided with a locking hole, the driving piece is arranged in the inner tube in a sliding mode and drives the swing arm to swing, the other end of the swing arm drives the locking pin to be inserted into or withdrawn from the locking hole, and therefore the inner tube and the outer tube can be locked or unlocked mutually.

2. The telescopic tube of claim 1, wherein: the lock releasing mechanism further comprises a driving rod, one end of the driving rod is connected with the driving piece, and the other end of the driving rod extends out of the outer pipe.

3. The telescopic tube of claim 2, wherein: the lock releasing mechanism further comprises an operating button, and the operating button is connected to the other end of the driving piece so that the driving rod pushes the driving piece to slide through pressing.

4. The telescopic tube of claim 1, wherein: the release mechanism further includes a first elastic member that provides an elastic force for inserting the locking pin into the locking hole.

5. The telescopic tube of claim 4, wherein: the first elastic piece is a torsion spring which is sleeved on the middle shaft and abuts against the swing arm.

6. The telescopic tube of claim 1, wherein: the inner wall of the outer pipe is provided with a fixed rod extending along the sliding direction of the inner pipe, and the locking hole is formed in the fixed rod.

7. The telescopic tube of claim 1, wherein: the outside of inner tube is equipped with the spout, the inner wall of outer tube is equipped with the slider, the slider set up with sliding in on the spout.

8. The telescopic tube of claim 1, wherein: the central axis of the locking pin is perpendicular to the central axis.

9. The telescopic tube of claim 8, wherein: the lock releasing mechanism further comprises a connecting shaft, the connecting shaft is connected with the locking pin, the base body is provided with a long hole extending along the sliding direction of the locking pin, the other end of the swing arm is provided with a driving inclined hole inclined relative to the long hole, and the connecting shaft is parallel to the middle shaft and penetrates through the driving inclined hole and the long hole in a sliding mode.

10. A ladder telescopic foot is characterized in that: a telescopic tube as claimed in any one of claims 1 to 9, including a foot support connected to the outer end of the inner tube.

11. A ladder telescopic foot as claimed in claim 10, wherein: the foot support is provided with a mounting seat, and the mounting seat is mounted in the outer end of the inner tube.

12. A ladder telescopic foot as claimed in claim 11, wherein: the telescopic foot of the ladder further comprises a foot pad and a support rod, an adjusting hole is vertically formed in the foot support, the support rod is slidably arranged in the adjusting hole, and the lower end of the support rod is connected with the foot pad.

13. A ladder telescopic foot as claimed in claim 12, wherein: the telescopic foot of the ladder further comprises a locking mechanism, and the locking mechanism is clamped with the support rod to lock the foot pad.

14. A ladder telescopic foot as claimed in claim 13, wherein: the locking mechanism comprises a locking piece, a driving shaft and an operating piece, a through hole communicated with the adjusting hole is formed in one side of the mounting seat, the driving shaft is pivoted on the mounting seat, the pivoting center shaft is perpendicular to the center shaft of the adjusting hole, the two ends of the driving shaft extend out of the outer tube to be connected with the operating piece, the locking piece is fixed on the driving shaft, and the driving shaft can drive the locking piece to extend into the adjusting hole or withdraw from the adjusting hole through the through hole so as to be clamped or separated with the supporting rod.

15. A ladder telescopic foot as claimed in claim 14, wherein: the locking mechanism further comprises a second elastic member, and the second elastic member provides an elastic force for enabling the locking member to exit the adjusting hole.

16. A ladder telescopic foot as claimed in claim 15, wherein: the second elastic piece is a torsion spring, one end of the torsion spring abuts against the locking piece, and the other end of the torsion spring abuts against the mounting seat.

17. A ladder telescopic foot as claimed in claim 14, wherein: the locking piece is provided with clamping teeth, and lines meshed with the clamping teeth are arranged on the outer side of the supporting rod.