TWI609685B - Electric crutch with length locking mechanism - Google Patents

Description

Electric crutch with length locking mechanism

The invention relates to an electric walking stick with a length locking mechanism, in particular to a driving and locking mechanism between a DC motor and a screw to ensure that the electric walking stick does not accidentally change its length structure due to external force, and the mechanism includes a drive base, a drive plate and at least one lock column, the drive base is provided with a plurality of push blocks at the bottom, the drive plate is provided with a plurality of displacement slots, and one end of the displacement slot is provided with a lock groove for When the driving column is loosened by an external force, since the locking column is in contact with the inner wall surface of the electric walking stick, the driving disk can be locked in a state in which it cannot be rotated, and further Make sure the length of the electric cane.

According to the improvement of living standards and health care, the average life expectancy of Chinese people has increased, and the proportion of the elderly population has continued to increase. According to statistics, Taiwan has entered an aging society in 1993 (that is, the population over 65 years old accounts for the total population). 7%), and it is estimated that in 2025, it will enter a super-aging society (ie, the population over 65 years old accounts for 20% of the total population). Under the gradual change of social structure, the demand and consumption potential of the silver-haired people have gradually attracted attention. Markets such as health food, biochemical technology, rehabilitation equipment, and home care have emerged, and related companies have racked their brains to existing products. Research and development, improvement, and design of products with better performance.

In the silver hair market, crutches are the most common equipment. Many elderly people with foot injuries and weak lower limbs must use crutches as an auxiliary support point for walking. Hold the center of gravity and support the weight of the body. However, the traditional walking sticks are mostly fixed lengths, and there are still many inconveniences in use. For example, when walking on a flat ground, the height of the handle of the walking stick should be located at the waist of the user to facilitate holding, but walking on the uphill At the same time, as the road surface system becomes higher, the handle of the walking stick will correspond to the height of the user's chest and abdomen, which makes it difficult for the user to hold the support. Similarly, when walking downhill, the user will feel The height of the handle is too low to support the center of gravity.

In view of this, there are currently a variety of "retractable crutches" designed by the industry. As shown in Fig. 1, the telescopic cane 1 is composed of an outer tube 11 and an inner tube 12, and the inner tube 12 is The outer tube body 11 is retractably mounted for arbitrarily adjusting by a user. According to the internal adjustment mechanism, the telescopic crutches can be further divided into "manual" and "electric". The manual telescopic cane 1 is provided with a plurality of inset holes in the inner wall of the outer tube 11 and The inner tube body 12 is provided with at least one embedded post, and the user can axially pull or push the inner tube body 12 to insert the insert post into different insert holes to change the telescopic cane 1 length. The biggest disadvantage of the manual telescopic cane 1 is that the user must lift the telescopic walking stick 1 and can adjust it. However, in the case where the user is a silver-haired family or a physically weak person, this operation mode is not only inconvenient, and needs to be used. The force is applied to push and pull the inner tube body 12, so there is a risk of "standing instability" during the adjustment process.

In addition, the electric telescopic cane 1 is provided with a DC motor and a screw in the outer tube 11 or the handle 13, and the inner tube 12 is screwed onto the screw, and the user only needs to pass through a control switch 110. By controlling the forward or reverse direction of the DC motor, the inner tubular body 12 is displaced along the axial direction of the outer tubular body 11, thereby adjusting the length of the telescopic cane 1. Although the electric telescopic cane 1 has the advantage of being convenient to operate, the inventors have found that the structure is still not perfect, because when the user walks on the electric telescopic cane, the bottom end of the inner tube 12 often Bear great The reaction force, in particular, the user walks on the uneven road surface outdoors, and the electric telescopic walking stick 1 strikes the hard object, or the user applies the whole body weight to the electric telescopic walking stick 1 due to the standing instability. In this case, the reaction force is extremely easy to reverse the DC motor, and the inner tube body 12 is retracted into the outer tube body 11, thereby causing the overall length of the electric telescopic walking stick 1 to be instantaneously shortened. The user naturally loses the support of the center of gravity and the risk of falling and injury.

Since the users of the telescopic cane 1 are mostly elderly or injured patients, once they fall, they will cause serious damage to the body. Therefore, how to modify the telescopic cane 1 to design a kind of energy The mechanism for locking the length can be said to be urgent. Therefore, how to add a locking mechanism to the existing structure of the electric telescopic walking stick 1 to ensure the stability of the user while walking is the present invention. Important topic.

In view of the fact that the conventional telescopic crutches lack a stable locking mechanism, the user can walk the telescopic crutches, and the telescopic crutches may be caused by the improper application of the user or the external force, resulting in a sudden contraction of the length. The inventor has improved the safety of the telescopic crutches because of the unstable center of gravity. After many studies and tests, the inventor finally designed an electric crutches with a length locking mechanism of the present invention, which can effectively solve the problem. The shortcomings and security risks of conventional technology.

An object of the present invention is to provide an electric walking stick with a length locking mechanism, comprising a handle, an outer tube body, a driving and locking mechanism, a screw and at least one inner tube body; the handle is provided with a control circuit and a power supply The unit and the DC motor have a switch on the peripheral, and the switch-on relationship is electrically connected to the power supply unit, the control circuit and the DC motor, respectively, for turning on or off the power supply unit to the control circuit and the DC motor Power supply, and at the supply When the electric unit supplies power to the control circuit and the DC motor, it is used to switch the control circuit to forward or reverse the DC motor; the top end of the outer tube can be mounted to the bottom end of the handle, and a The upper end of the outer tube body is provided with a lower opening, and the upper opening is in communication with the lower opening to form an accommodating space in the outer tube body, and the inner wall of the outer tube body is axially Providing at least one first track portion; the drive and locking mechanism comprises: a drive seat rotatably positioning a position of the handle adjacent to the bottom end, or a position adjacent to the top end of the outer tube body, the top portion of which is directly or indirectly The ground is connected to the output shaft of the DC motor so as to be forwardly or reversely driven by the DC motor, and a plurality of push blocks are protruded from the bottom of the drive seat; a drive plate is rotatably positioned on the handle Or the position of the outer tube body corresponding to the bottom end of the transmission base, the driving plate is concavely disposed with a plurality of displacement grooves in a circumferential direction, and one end of the displacement groove is further recessed with a first locking groove, and each of the pushing blocks is Extending into each of the displacement slots And being able to be displaced in the forward or reverse direction in the displacement groove; the at least one first locking column is movably mounted in the first locking groove, and the pushing block is pushed against the first locking column When the one side is co-displaced, the first lock cylinder can be disengaged from the inner wall of the handle or the outer tube, and the other side of the first lock column can abut the first lock groove a wall, which in turn pushes the drive plate to rotate forward; the screw is positioned in the accommodating space, and the top end is fixed to the center of the drive plate, and can be driven by the drive plate to rotate forward or reverse; the inner tube The system is movably mounted in the outer tube body in sequence, and the inner wall is provided with a thread so as to be screwed with the screw thread of the outer edge of the screw, and the outer wall is provided with at least one second rail portion. The two rail portions can be embedded in the first rail portion. In this case, in the case that the DC motor rotates or reverses, the output shaft of the DC motor can drive the transmission base to push the pushing block against the first lock column or the other end of the displacement slot, thereby driving the The driving disc and the screw rotate to enable the inner tube body to be displaced along the direction of the rail portions; conversely, when the DC motor is not rotated, when the bottom end of the inner tube body is subjected to the outer end When the screw is driven to drive the driving plate to rotate forward or reverse, the inner wall of the first locking groove will push against the other side of the first locking column, so that the first locking column can be connected with the handle Or the inner wall of the outer tube contacts, and the first lock column is used to lock the driving disk in the handle or the outer tube body so as not to be rotated or reversed.

In order to facilitate the review committee, the locking principle, structural features and purposes of the present invention can be further understood and understood. The embodiments are combined with the drawings and are described in detail as follows:

[study]

1‧‧‧ Telescopic walking stick

11‧‧‧External body

12‧‧‧ inner tube

110‧‧‧Control switch

13‧‧‧Hands

〔this invention〕

2‧‧‧Electric walking stick

21‧‧‧Hands

210‧‧‧DC motor

211‧‧‧Charging socket

C‧‧‧Control circuit

P‧‧‧Power supply unit

S‧‧‧Toggle switch

22‧‧‧External body

220‧‧‧ accommodating space

221‧‧‧First Track Department

23‧‧‧ screw

24‧‧‧ inner tube

241‧‧‧Second track section

3‧‧‧Drive and locking mechanism

31‧‧‧ sleeve

310‧‧‧Rotating thread

32‧‧‧Drive seat

320‧‧‧ Push block

33‧‧‧ drive disk

330‧‧‧ displacement slot

331‧‧‧First lock slot

332‧‧‧Second lock slot

333‧‧‧ drive shaft

334‧‧ ‧ Palin

34‧‧‧First lock column

35‧‧‧Second lock column

36‧‧‧Reduction gear set

37‧‧‧Base

D1‧‧‧First distance

D2‧‧‧Second distance

D3‧‧‧ third distance

1 is a schematic view of a conventional telescopic crutches; FIG. 2 is a schematic view of an electric crutches of the present invention; FIG. 3 is a schematic diagram of a control circuit and a control switch of the present invention; and FIG. 4 is a driving and driving of the electric crutches of the present invention; A schematic view of the locking mechanism; and Figs. 5A and 5B are schematic views of the operation of the electric cane of the present invention.

The present invention is an electric walking stick with a length locking mechanism. Referring to FIGS. 2~3, which is a first preferred embodiment of the present invention, the electric walking stick 2 includes a handle 21, an outer tube 22, a drive and a locking mechanism 3, a screw 23 and at least one inner tube body 24. The handle 21 is provided with a control circuit C, a power supply unit P (such as a rechargeable battery) and a DC motor 210. The peripheral device has a switch S. The switch S is electrically connected to the power supply unit P, the control circuit C and the DC motor 210, respectively, for turning on or off the power supply unit P to supply power to the control circuit C and the DC motor 210, and the power supply is When the unit P supplies power to the control circuit C and the DC motor 210, it is used to switch the forward rotation of the DC motor 210 by the control circuit C (for example, the switch S is turned up) Move) or reverse (for example, toggle switch S is turned down) control.

The top end of the outer tube 22 can be mounted (eg, screwed, fitted) to the bottom end of the handle 21, and has an upper opening, and the bottom end of the outer tube 22 is provided with a lower opening, the upper opening And the lower opening system communicates with each other to form an accommodating space 220 in the outer tube body 22. The inner wall of the outer tube body 22 is provided with at least one first rail portion 221 in the axial direction (for example, a track groove) ).

According to the present invention, the driving force and the locking mechanism 3 transmit the rotational force of the DC motor 210 to the screw 23 and the inner tubular body 24 (the inner tubular body 24 can be a plurality of branches, which is described by only one in the present embodiment) The inner tubular body 24 can be axially displaced along the outer tubular body 22, but when the direct current motor 210 is not activated, the screw 23 can be fixed in a state in which it cannot be rotated. Referring to Figures 2 to 5A, the driving and locking mechanism 3 includes a sleeve 31, a transmission base 32, a drive plate 33 and at least one first lock column 34. The sleeve 31 is fixed (e.g., The locking member is located adjacent to the bottom end in the handle 21 or may be fixed in the outer tubular body 22 at a position adjacent to the top end.

The transmission base 32 is rotatably positioned in the sleeve 31, and the top portion thereof is coupled to a reduction gear set 36, and the reduction gear set 36 is disposed at a position adjacent to the bottom end of the handle 21 (or the outer portion) The position of the tubular body 22 adjacent to the top end is such that one end thereof can be connected to the output shaft of the DC motor 210, and rotates at a lower speed than the DC motor 210 to increase the rotational torque, and the drive base 32 is rotated as a whole. In the embodiment, the reduction gear set 36 is a set of planetary gear sets disposed in the sleeve 31, and the inner wall of the sleeve 31 is provided with a plurality of rotary threads 310 corresponding to the position of the planetary gear set. The planetary gear set can be rotated along the rotating thread 310. However, in other preferred embodiments of the present invention, the output shaft of the DC motor 210 can also be directly fixed to the top end of the transmission base 32 to drive the The drive base 32 rotates.

The center of the transmission base 32 is connected to the other end of the reduction gear set 36. A plurality of pushing blocks 320 are protruded from the bottom of the sleeve, and the contours of the pushing blocks 320 are matched with the inner wall of the sleeve 31. In design, the outer wall of the pushing block 320 can be combined with the sleeve. A gap is maintained in the inner wall of the cylinder 31 to ensure smooth rotation. The driving disc 33 is rotatably positioned at a position corresponding to the bottom end of the driving base 32. The driving disc 33 is circumferentially recessed with a plurality of displacement slots 330, and one end of the displacement slot 330 A first locking slot 331 is defined in the recess, and each of the pushing blocks 320 is located corresponding to each of the displacement slots 330 so as to extend into each of the displacement slots 330 and circumferentially in the displacement slot 330. Medium forward or reverse displacement.

Referring to FIGS. 2~5A, the first lock post 34 is mounted to one of the first lock grooves 331 (in the present embodiment, all of the first lock grooves 331 are provided with a first The lock column 34 makes the lock function more stable, but in principle, a first lock column 34 can play a lock function; the screw 23 is positioned in the accommodating space 220, and the top end is fastened. Connected to the axis of the drive plate 33 to be driven forward or reverse by the drive plate 33; the inner tube 24 is movably mounted within the outer tube 22, and the inner wall is threaded The outer rail is provided with at least one second rail portion 241 (eg, a slide rail), and the second rail portion 241 can be embedded in the first rail portion. In 221, when the screw 23 rotates, the inner tubular body 24 can be displaced along the direction of the rail portions 221, 241 to adjust the length of the bottom end of the inner tubular body 24 exposed outside the outer tubular body 22, The electric cane 2 can be easily and always adjusted to an optimum length that meets the user's needs.

In order to understand the driving and locking principle of the present invention, the driving manner of the electric walking stick 2 is as follows: Please refer to the second to fifth figures, when the user wants to adjust the length of the electric walking stick 2, First, the control switch is toggled to enable the DC motor 210 to rotate forward (for example, "forward rotation" is referred to as "elongating electric crutches 2"). At this time, the DC motor 210 can be sequentially passed through. The reduction gear set 36 and the transmission base 32 drive the pushing blocks 320, and the pushing blocks 320 can be pushed against one side of the first locking column 34 to collectively displace along the circumferential direction during the displacement process. The first lock column 34 can be disengaged from the inner wall of the sleeve 31, and the other side of the first lock column 34 can abut against the inner wall of the first lock groove 331 to push The drive plate 33 and the screw 23 are rotated forward so that the bottom end of the inner tube body 24 extends away from the outer tube body 22.

Similarly, when the user wants to shorten the electric crutches 2, the control switch can be reversely toggled to reverse the DC motor 210. At this time, the pushing blocks 320 can be directly pushed to the displacement slot 330. One end (the other end of the displacement groove 330 may also be provided with a second locking groove 332 and a second locking column 35, which will be described later in detail), and the driving plate 33 and the screw 23 are reversed to make the inner tube The bottom end of the body 24 expands and contracts in the direction of the outer tubular body 22.

On the other hand, when the user has fixed the electric cane 2 at the optimal length and walks next to the electric cane 2, if the inner tube body 24 is subjected to a large external force suddenly (for example, the user suddenly applies the whole body weight to The electric cane 2 is caused to cause the inner tubular body 24 or the screw 23 to simultaneously receive an abnormal rotational force. When the screw 23 is driven to drive the drive disc 33 to reverse, please refer to the second to fifth figures. The inner wall of the first lock groove 331 will push against the other side of the first lock column 34, however, since the inner wall of the first lock groove 331 does not correspond to the center of the first lock column 34 Therefore, after the inner wall of the first lock groove 331 is pushed against the first lock column 34, the first lock column 34 will be deflected and contact with the inner wall of the sleeve 31, thereby The first locking post 34 locks the driving disc 33 in the sleeve 31 so as to be unable to rotate or reverse. Therefore, the electric crutches 2 are not deviated from the optimal length due to improper force applied by the user. .

Thus, through the driving and locking mechanism 3, since the driving plate 33 (cooperating with the screw 23) and the pushing block 320 are provided with the first locking post 34, if the driving plate 33 is If the inner wall of a lock groove 331 is actively pushed against the first lock column 34, the first lock column 34 is deflected and touches the inner wall surface of the sleeve 31, and the drive plate 33 is locked. In the sleeve 31, it is in a state in which it cannot be rotated forward or reversed, and it is ensured that the electric cane 2 is not suddenly shortened by the user without expectation, and the risk of falling is caused.

In addition, as shown in FIG. 2 to FIG. 5B, in the embodiment, the other end of the displacement groove 330 is recessed with a second locking groove 332, and the driving and locking mechanism 3 includes a plurality of second locks. The column 35, each of the second lock columns 35 are paired with each of the first lock columns 34, respectively, so as to be respectively mounted to the two ends of the displacement groove 330, that is, the second lock column 35 The system is movably mounted in the second lock slot 332. In this way, the second lock cylinder 35 can be disengaged from the sleeve when the push block 320 is pushed against one side of the second lock cylinder 35 by the same principle. The inner wall of the 31 is in contact with each other, and the other side of the second lock cylinder 35 can abut against the inner wall of the second lock groove 332, thereby pushing the drive plate 33 to reverse to further lift the drive and lock mechanism 3 Lock effect.

In particular, in the foregoing embodiment, the sleeve 31 is a separate component, but in other embodiments of the invention, the sleeve 31 can be fixed in the handle 21 adjacent to the bottom end. a position (eg, directly formed integrally at the bottom of the handle 21), or a position adjacent to the top end of the outer tubular body 22 (eg, directly integrally formed on the top of the outer tubular body 22) to rotatably position the transmission base 32 In the sleeve 31, the combination is first and foremost.

Further details of the driving and locking principles and detailed features of the lock columns 34, 35 are as follows: Referring to Figures 5A and 5B, in the present embodiment, when the user does not drive the DC motor, The locking posts 34, 35 are abutted against the first abutting points on the inner walls of the locking grooves 331, 332, and abut against a second abutting point on each of the pushing blocks 320. Relying on the drive Between the center points of the disk 33, a first distance D1, an axis of each of the lock columns 34, 35 and a center point of the drive plate 33 have a second distance D2, the second abutment point and the drive plate There is a third distance D3 between the center points of 33, and the distances D1 to D3 have a relationship of "D1 < D2 < D3". Thus, when the push block 320 is pushed against each of the lock columns 34, 35, The third distance D3 is greater than the second distance D2. Therefore, the lock columns 34 and 35 will be deflected and penetrate in the direction of the lock grooves 331, 332 to drive the drive plate 33 to rotate.

On the other hand, when the screw 23 is affected by an external force, and the inner wall of each of the lock grooves 331, 332 is pushed against each of the lock columns 34 and 35, since the first distance D1 is smaller than the second distance D2, the lock is The posts 34, 35 will deflect, not directly in the direction of the push block 320, but will abut against the inner wall of the sleeve 31 to lock the drive plate 33.

In addition, in the present embodiment, the driving and locking mechanism 3 further includes a rotating shaft 333, and one end of the rotating shaft 333 is fixed to the center of the driving plate 33. The other end of the shaft 333 can be integrally connected with the top end of the screw 23, that is, the screw 23 is not directly connected to the driving plate 33, but is transmitted through the rotating shaft 333, due to the section of the rotating shaft 333. The configuration has an angular shape, and the top end of the screw 23 is recessed with a card insertion groove. Therefore, the rotating shaft 333 can be engaged with the top end of the screw 23 to indirectly fix the screw 23 to the driving plate 33. In addition, the rotation shaft 333 can be sleeved with a Palin 334, and the inner edge of the Palin 334 is sleeved and fixed to the rotating shaft 333, and the outer edge of the Palin 334 is fixedly fastened to the handle 21 or The inner wall of the outer tubular body 22 (or the inner wall of the sleeve 31) ensures the smoothness of the rotation of the rotating shaft 333.

Referring to Figures 2 to 4, the drive and locking mechanism 3 further includes a base 37 that is positioned (e.g., locked) at the bottom end of the handle 21 and the outer tubular body 22, The base 37 is provided with a central hole through which the other end of the rotating shaft 333 can pass, and the screw The top ends of the rods 23 are integrally connected.

As shown in FIG. 2 to FIG. 3 , the electric cane 2 further includes a charging socket 211 . The charging socket 211 is disposed on the handle 21 and electrically connected to the power supply unit P through the control circuit C. The power supply unit P can be charged through the control circuit C in a state in which a power source is inserted into the charging socket 211.

The above description is only a few preferred embodiments of the present invention, but the technical features of the present invention are not limited thereto, and those skilled in the relevant art can easily think of it after considering the technical content of the present invention. Equivalent changes should not depart from the scope of protection of the present invention.

3‧‧‧Drive and locking mechanism

31‧‧‧ sleeve

310‧‧‧Rotating thread

32‧‧‧Drive seat

320‧‧‧ Push block

33‧‧‧ drive disk

330‧‧‧ displacement slot

333‧‧‧ drive shaft

334‧‧ ‧ Palin

34‧‧‧First lock column

35‧‧‧Second lock column

36‧‧‧Reduction gear set

Claims (11)

The utility model relates to an electric walking stick with a length locking mechanism, comprising: a handle, a control circuit, a power supply unit and a DC motor, wherein a peripheral switch has a switch, the switch open relationship and the power supply unit, the control circuit and the The DC motor is electrically connected to turn on or off the power supply unit to supply power to the control circuit and the DC motor, and when the power supply unit supplies power to the control circuit and the DC motor, switch the control circuit to the DC a forward or reverse rotation control of the motor; an outer tube body, the top end of the outer tube body can be mounted to the bottom end of the handle, and an upper opening is provided, and the bottom end of the outer tube body is provided with a lower opening, The upper opening and the lower opening communicate with each other to form an accommodating space in the outer tube body, the inner wall of the outer tube body is provided with at least one first rail portion in the axial direction, and a driving and locking mechanism includes: The transmission base is rotatably positioned at a position adjacent to the bottom end of the handle or adjacent to the top end of the outer tube body, and the top portion thereof is directly or indirectly connected to the output shaft of the DC motor The driving base can be rotated forward or reversed, and a plurality of pushing blocks are protruded from the bottom of the driving base; a driving plate is rotatably positioned in the handle or the outer tube corresponding to the bottom of the transmission base a plurality of displacement slots are recessed in the circumferential direction of the driving plate, and a first locking slot is recessed at one end of the displacement slot, and each of the pushing blocks respectively extends into each of the displacement slots, and Capable of being displaced in a forward or reverse direction in the displacement groove; and at least one first lock column movably mounted in the first lock groove, the push block being pushed against the first lock column When the one side is co-displaced, the first lock cylinder can be disengaged from the inner wall of the handle or the outer tube, and the other side of the first lock column can abut the first lock groove Wall, which in turn pushes the drive plate forward; a screw is positioned in the accommodating space, and the top end is fixed to the center of the driving plate, can be driven by the driving plate to rotate forward or reverse; and at least one inner tube body is movably Installed in the outer tube body, the inner wall is provided with a thread to be screwed with the screw of the outer edge of the screw, and the outer wall is provided with at least one second rail portion, the second rail portion can be embedded In the first track portion, the output shaft of the DC motor can drive the drive base to push the push block against the first lock column or the displacement slot. The other end, in turn, drives the driving disc and the screw to rotate, so that the inner tube body can be displaced along the direction of the rail portions; conversely, when the DC motor is not rotated, when the inner tube body is subjected to an external force, it is driven When the screw drives the driving disc to rotate forward or reverse, the inner wall of the first locking groove will push against the other side of the first locking column, so that the first locking column can be connected with the handle or the outer tube The inner wall of the body is in contact with each other, and the first lock cylinder is used to lock the drive disc to the handle or the outer The body into a state can not forward or reverse it. The electric crutches of claim 1, wherein the other end of the displacement groove is recessed with a second locking groove, and the driving and locking mechanism further comprises at least one second locking column, the second locking column Movably mounted to each of the second lock grooves, the second lock column can be disengaged from the handle or the outer tube when the push block is pushed against one side of the second lock column for common displacement The inner wall is in contact, and the other side of the second lock cylinder can abut against the inner wall of the second lock groove, thereby pushing the drive plate to reverse. The electric cane of claim 2, further comprising a sleeve fixed to a position in the handle adjacent to the bottom end or a position adjacent to the top end of the outer tube body to enable the transmission seat to be rotatably Positioned in the sleeve to disengage the first lock column or the second lock column when the push block is pushed against one side of the first lock column or the second lock column In contact with the inner wall of the sleeve; conversely, when the direct current motor is not rotated, when the inner tube body is subjected to an external force, When the screw is driven to drive the drive plate to rotate forward or reverse, the first lock groove or the second lock groove inner wall will push against the first lock column or the other side of the second lock column. So that the first lock column or the second lock column can be in contact with the inner wall of the sleeve, and the first lock column or the second lock column is used to lock the drive plate to the sleeve The inside of the cylinder becomes in a state in which it cannot be rotated forward or reversed. The electric crutches of claim 3, wherein the driving and locking mechanism further comprises a reduction gear set disposed at a position adjacent to the bottom end of the handle or a position adjacent to the top end of the outer tube body, the reduction gear set One end is connected to the output shaft of the DC motor, and the other end of the reduction gear set is connected to the center of the transmission base, and the reduction gear set can rotate at a lower speed than the DC motor to increase the rotational torque. The drive seat is rotated. The electric crutches of claim 4, wherein the reduction gear set is mounted within the sleeve. The electric crutches of claim 5, wherein the reduction gear set is a planetary gear set, and the inner wall of the sleeve is provided with a plurality of rotary threads corresponding to the planetary gear set position, so that the planetary gear set can Rotate along the rotating threads. The electric crutches of claim 6, wherein the electric crutches further comprise a charging socket, the charging socket is disposed on the handle, and is electrically connected to the power supply unit through the control circuit to be in the charging socket The power supply unit can be charged through the control circuit while the power supply is plugged in. The electric crutches of claim 1, 2, 3, 4, 5, 6 or 7, wherein each of the lock cylinders can abut the first abutment point on the inner wall of each of the lock grooves, and can Abutting a second abutting point on each of the pushing blocks, the first abutting point and the center point of the driving plate have a first distance, an axis of each of the locking columns and a center of the driving plate There is a second distance between the points, and the second abutting point has a third distance from the center point of the driving plate, and the second distance is greater than the first distance but smaller than the third distance. The electric crutches of claim 8, wherein the driving and locking mechanism further comprises a rotating shaft, One end of the rotating shaft is fixed to the center of the driving plate, and the other end of the rotating shaft can be integrally connected with the top end of the screw. The electric crutches according to claim 9 further comprising a Palin, the inner edge of the Palin is sleeved and fixed to the rotating shaft, and the outer edge of the Palin is embedded and fixed to the handle or the outer tube. The inner wall. The electric crutches according to claim 10, wherein the driving and locking mechanism further comprises a base, the base is positioned at a bottom end of the handle and the outer tube body, the base is provided with a central hole, and the other end of the rotating shaft It can be connected to the top end of the screw through the center hole.