Walking Cane

Abstract

A walking cane may include an inner tube, an outer tube, and a linkage member. The linkage member accommodated between the inner tube and the outer tube comprises a shaft rod, a connecting block, a pushing member, and a tightening member, and a first threaded section and a second threaded section are respectively formed on two ends of the shaft rod, and a first locating portion is protrudingly formed on a shaft body of the shaft rod to securely position a washer. The shaft rod is connected to a pulling portion of the inner tube through the connecting block so as to allow the pulling portion to control the vertical displacement of the shaft rod, and to drive the pushing member and the tightening member to have expand and tighten or contract and loosen status, thereby adjusting and securing the length between the inner tube and the outer tube.

Description

FIELD OF THE INVENTION

[0001] The present invention relates to a walking cane and more particularly to a walking cane with a telescopic adjustment structure.BACKGROUND OF THE INVENTION

[0002] Referring to FIGS. 10 and 11, a conventional telescopic walking cane (40) comprises a main body (41) and a supporting rod (42), and a telescopic positioning structure (50) is provided at the corresponding position between the main body (41) and the supporting rod (42). The telescopic positioning structure (50) has a tube sleeve (51) and an expanding driving member (52), and the tube sleeve (51) is inserted into the supporting rod (52) in a tight-fitting manner. Moreover, an external threaded section (511) is formed on the surface of the tube sleeve (51), and one end of the expanding driving member (52) is cylindrically shaped and threaded onto the external threaded section (511) of the tube sleeve (51). The bottom end of the expanding driving member (52) is provided with an elastic claw portion (521), and the tube sleeve (51) is fitted into a conical frustum (60). The tube sleeve (51) is provided with a support portion (512) at its base for abutting against the bottom of the conical frustum (60). Additionally, the conical frustum (60) and the elastic claw portion (521) of the expanding driving member (52) are arranged in an inclined abutting fit. This configuration enables the elastic claw portion (521) of the expanding driving member (52) to expand outwardly, thereby tightly pressing against the inner wall of the main body (41) to achieve a stable positioning state. When adjusting the length of the cane (40), the user rotates the supporting rod (42), which simultaneously drives the tube sleeve (51) and the conical frustum (60) to rotate. This rotation causes the external threaded section (511) of the tube sleeve (51) to engage in a threaded displacement with the expanding driving member (52), thereby controlling the tightening or loosening interaction between the expanding driving member (52) and the conical frustum (60), ultimately achieving the purpose of length adjustment.

[0003] However, the conventional walking cane has following disadvantages: (i) the cane (40) uses the external threaded section (511) of the tube sleeve (51) to apply a threaded locking force, causing the conical frustum (60) to expand the expanding driving member (52), thereby enabling the elastic claw portion (521) of the expanding driving member (52) to press tightly against the inner wall of the main body (41). However, to increase the clamping force, the user needs to exert more effort to compress the expanding driving member (52) through the tube sleeve (51), which results in excessive resistance during the threaded rotation, making the operation noticeably labor-intensive; and (ii) The external threaded section (511) of the tube sleeve (51) and the expanding driving member (52) require a rotational mechanism to adjust the length of the cane. However, the supporting rod (42) has a smooth outer surface, making it difficult for users to grip and rotate effectively. Additionally, the length adjustment process via rotating the supporting rod (42) is relatively slow, preventing the user from making quick length changes based on real-time usage needs. As a result, the cane (40) presents operational inconveniences in terms of both grip and adjustment efficiency. Therefore, there remains a need for a new and improved design for a walking cane to overcome the problems presented above.SUMMARY OF THE INVENTION

[0004] The present invention provides a telescopic walking cane comprising an inner tube, an outer tube, and a linkage member. A guiding plane is axially formed on the outer periphery of the inner tube, and the a through hole and a positioning hole respectively penetrate through a surface of an upper portion of the guiding plane. A connecting sleeve, connected with the inner tube at a position corresponding to the through hole and the positioning hole, comprises a first pivot portion and a second pivot portion, and the first pivot portion is formed in the shape of two lugs, and a penetrating slot penetrating through an inner surface and an outer surface of the connecting sleeve is formed between the two lugs. A positioning protrude formed on an inner wall of the connecting sleeve is connected and secured with the positioning hole. The first pivot portion is assembled with a pulling portion, and a connecting portion and a linkage portion are respectively formed at a central portion and a front end of the pulling portion. The linkage portion is adapted to pass through the penetrating slot and through hole into the inner tube, and the connecting portion is pivotally connected to the first pivot portion. The second pivot portion is assembled with a locking cover to restrict the movement of the pulling portion, and a first handle is formed on a top end of the inner tube. An anti-slip pad is connected to one end of the outer tube while an open tube port is formed at the other end of the outer tube. An outer tube sleeve is disposed on the open tube port, and a locating plane is formed on an inner periphery of the outer tube sleeve. The inner tube is inserted and assembled through the open tube port, and the guiding plane is coupled and aligned against the locating plane of the outer tube sleeve, thereby further restricting the rotation of the inner tube. The linkage member accommodated between the inner tube and the outer tube comprises a shaft rod, a connecting block, a pushing member, and a tightening member, and a first threaded section and a second threaded section are respectively formed on two ends of the shaft rod, and a first locating portion is protrudingly formed on a shaft body of the shaft rod to securely position a washer. A first spring is upwardly sleeved on the shaft rod from the second threaded section, and one end of the first spring is abutted against the washer to form a fixed position. One end of the connecting block is secured on the first threaded section of the shaft rod, and an assembly slot is formed at a lateral side of the connecting block to connect to the linkage portion of the pulling portion, and an axial channel axially penetrates through both ends of the pushing member. The axial channel pass through the second threaded section to sleeve the pushing member on the shaft rod, so as to restrict the first spring between the pushing member and the washer. A socket portion is formed at one end of the pushing member to connect to one end of the inner tube, and the socket portion has a second fitting plane to be coupled and secured with the guiding plane of the inner tube. The other end of the pushing member comprises a tapered portion, and a locating ring section is formed between the tapered portion and the socket portion to abut against an end edge of the inner tube. The tightening member comprises a plurality of adjacent expanding pieces arranged in a ring shape, and an axial hole is formed between the expanding pieces, and at least an elastic ring is disposed on an outer periphery of the expanding pieces. The tightening member passes through the second threaded section of the shaft rod through the axial hole, and the expanding pieces is configured to cover around the tapered portion of the pushing member. A rear end of the tightening member and the second threaded section are connected and secured through a threaded lock member, and the tightening member is inserted into the outer tube. The pulling portion is pulled to control the vertical displacement of the shaft rod, so as to drive the tightening member and pushing member into a tightening status or a loosen status, thereby adjusting and securing the length between the inner tube and outer tube.

[0005] In one embodiment, an inner periphery of the connecting sleeve (12) comprises a first fitting plane to be coupled and secured with the guiding plane of the inner tube, and the locking cover is pivotally and flipably mounted on the second pivot portion of the connecting sleeve. The locking cover has an open slot to allow one end of the pulling portion to penetrate therethrough, and an engaging protrude is formed on an inner wall of the locking cover. An outer wall of the first pivot portion of the connecting sleeve comprises an engaging slot to engage with the engaging protrude, and the locking cover is configured to block the upward movement path of the pulling portion, thereby achieving the effect of locking the pulling portion.

[0006] In another embodiment, an inner periphery of the outer tube comprises a buffer spring to abut against an upper portion of the anti-slip pad.

[0007] In still another embedment, a non-circular tool hole is formed on the other end of the connecting block.

[0008] In a further embodiment, a second locating portion is protrudingly formed on shaft rod adjacent to the first threaded section, and a soft column is sleeved onto the shaft rod and limited between first locating portion and the second locating portion, and an outer diameter of the soft column is larger than an outer diameter of the washer.

[0009] In still a further embodiment, an end of the axial hole of the tightening member is recessed and formed with a reduced-diameter section, and the threaded lock member has a rivet nut and first nut. The rivet nut is embedded into the reduced-diameter section, and a third threaded section is formed on an inner periphery of the rivet nut to engage with the second threaded section, and the first nut is threaded onto an end of the second threaded section and abutted against a bottom of the tightening member.

[0010] Comparing with conventional walking cane, the present invention is advantageous because: (i) the linkage member is installed between the inner tube and the outer tube, and the pushing member of the linkage member is fixedly mounted at the end of the inner tube while the tightening member of the linkage member is movably extendable into the outer tube. Moreover, the shaft rod is connected to the pulling portion of the inner tube through the connecting block so as to allow the pulling portion to control the vertical displacement of the shaft rod, and to drive the pushing member and the tightening member to have expand and tighten or contract and loosen status, thereby adjusting and securing the length between the inner tube and the outer tube. The simple and labor-saving telescopic adjustment function allows the user to quickly and easily adjust to the desired length, making it especially suitable for elderly users with less strength or limited dexterity, thus enhancing ease of use; and (ii) the guiding plane is formed on the outer periphery of the inner tube, and the inner wall of the outer tube sleeve of the outer tube has the locating plane to couples with and corresponds to the guiding, so as to guide and restrict the movement of the inner tube, effectively preventing relative rotation between the inner tube and the outer tube during telescopic adjustment, and then enhancing the stability of the walking cane during use and while adjusting its length.BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG. 1 is a three-dimensional perspective view of a walking cane of the present invention.

[0012] FIG. 2 is an exploded view of the walking cane of the present invention.

[0013] FIG. 3 is an exploded view of a linkage member of the walking cane of the present invention.

[0014] FIG. 4 is a sectional view of the walking cane of the present invention including partially enlarged views thereof.

[0015] FIG. 5 is a schematic view illustrating a locking cover is opened and a shaft rod is driven by a pulling portion of the walking cane of the present invention.

[0016] FIG. 6 is a schematic view illustrating the shaft rod is downward moved to cause a tightening member of the walking cane to be contracted and an inner wall of the outer tube is released in the present invention.

[0017] FIG. 7 is a schematic view illustrating a pulling portion is released and the shaft rod is moved upward by a first spring, causing the tightening member to expand and press against the inner wall of the outer tube in the present invention.

[0018] FIG. 8 is a schematic view illustrating the locking cover is closed upward and lock in the present invention.

[0019] FIG. 9 is a schematic view illustrating the walking cane of the present invention is in an extended state for use.

[0020] FIG. 10 is a prior art.

[0021] FIG. 11 is a prior art.DETAILED DESCRIPTION OF THE INVENTION

[0022] The detailed description set forth below is intended as a description of the presently exemplary device provided in accordance with aspects of the present invention and is not intended to represent the only forms in which the present invention may be prepared or utilized. It is to be understood, rather, that the same or equivalent functions and components may be accomplished by different embodiments that are also intended to be encompassed within the spirit and scope of the invention.

[0023] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this invention belongs. Although any methods, devices and materials similar or equivalent to those described can be used in the practice or testing of the invention, the exemplary methods, devices and materials are now described.

[0024] All publications mentioned are incorporated by reference for the purpose of describing and disclosing, for example, the designs and methodologies that are described in the publications that might be used in connection with the presently described invention. The publications listed or discussed above, below and throughout the text are provided solely for their disclosure prior to the filing date of the present application. Nothing herein is to be construed as an admission that the inventors are not entitled to antedate such disclosure by virtue of prior invention.

[0025] In order to further understand the goal, characteristics and effect of the present invention, a number of embodiments along with the drawings are illustrated as following:

[0026] Referring to FIGS. 1 to 4, the present invention provides a telescopic walking cane comprising an inner tube (10), an outer tube (20), and a linkage member (30). A guiding plane (11) is axially formed on the outer periphery of the inner tube (10), and the a through hole (111) and a positioning hole (112) respectively penetrate through a surface of an upper portion of the guiding plane (11). Moreover, a connecting sleeve (12) is connected with the inner tube (10) at a position corresponding to the through hole (111) and the positioning hole (112), and an inner periphery of the connecting sleeve (12) comprises a first fitting plane (121) to be coupled and secured with the guiding plane (11) of the inner tube (10). Also, a first pivot portion (122) and a second pivot portion (123) are formed on an outer periphery of the connecting sleeve (12), and the first pivot portion (122) is formed in the shape of two lugs, and a penetrating slot (124) penetrating through an inner surface and an outer surface of the connecting sleeve (12) is formed between the two lugs. The penetrating slot (124) is communicated with the through hole (111), and a positioning protrude (125) formed on an inner wall of the connecting sleeve (12) is connected and secured with the positioning hole (112). The first pivot portion (122) is assembled with a pulling portion (13), and a connecting portion (131) and a linkage portion (132) are respectively formed at a central portion and a front end of the pulling portion (13). The linkage portion (132) is adapted to pass through the penetrating slot (124) and through hole (111) into the inner tube (10), and the connecting portion (131) is pivotally connected to the first pivot portion (122). The second pivot portion (123) is assembled with a locking cover (14) to restrict the movement of the pulling portion (13), and the locking cover (14) is pivotally and flipably mounted on the second pivot portion (123) of the connecting sleeve (12). Furthermore, the locking cover (14) has an open slot (141) to allow one end of the pulling portion (13) to penetrate therethrough, and an engaging protrude (142) is formed on an inner wall of the locking cover (14). An outer wall of the first pivot portion (122) of the connecting sleeve (12) comprises an engaging slot (126) to engage with the engaging protrude (142), and the locking cover (14) is configured to block the upward movement path of the pulling portion (13), thereby achieving the effect of locking the pulling portion (13). In addition, A first handle (15) is formed on a top end of the inner tube (10), and an anti-slip pad (21) is connected to one end of the outer tube (20) while an open tube port (22) is formed at the other end of the outer tube (20). Moreover, an outer tube sleeve (23) is disposed on the open tube port (22), and a locating plane (231) is formed on an inner periphery of the outer tube sleeve (23). The inner tube (10) is inserted and assembled through the open tube port (22), and the guiding plane (11) is coupled and aligned against the locating plane (231) of the outer tube sleeve (23), thereby further restricting the rotation of the inner tube (10). Additionally, an inner periphery of the outer tube (20) comprises a buffer spring (24) to abut against an upper portion of the anti-slip pad (21).

[0027] The linkage member (30) accommodated between the inner tube (10) and the outer tube (20) comprises a shaft rod (31), a connecting block (32), a pushing member (33), and a tightening member (34), and a first threaded section (311) and a second threaded section (312) are respectively formed on two ends of the shaft rod (31), and a first locating portion (313) is protrudingly formed on a shaft body of the shaft rod (31) to securely position a washer (314). A first spring (315) is upwardly sleeved on the shaft rod (31) from the second threaded section (312), and one end of the first spring (315) is abutted against the washer (314) to form a fixed position. One end of the connecting block (32) is secured on the first threaded section (311) of the shaft rod (31), and a non-circular tool hole (321) is formed on the other end of the connecting block (32) so as to allow the use of a hand tool to fasten the connecting block (32) onto the first threaded section (311). An assembly slot (322) is formed at a lateral side of the connecting block (32) to connect to the linkage portion (132) of the pulling portion (13), and an axial channel (331) axially penetrates through both ends of the pushing member (33). The axial channel (331) pass through the second threaded section (312) to sleeve the pushing member (33) on the shaft rod (31), so as to restrict the first spring (315) between the pushing member (33) and the washer (314). Furthermore, a socket portion (332) is formed at one end of the pushing member (33) to connect to one end of the inner tube (10), and the socket portion (332) has a second fitting plane (333) to be coupled and secured with the guiding plane (11) of the inner tube (10). Also, the other end of the pushing member (33) comprises a tapered portion (334), and a locating ring section (335) is formed between the tapered portion (334) and the socket portion (332) to abut against an end edge of the inner tube (10). The tightening member (34) comprises a plurality of adjacent expanding pieces (341) arranged in a ring shape, and an axial hole (342) is formed between the expanding pieces (341), and at least an elastic ring (343) is disposed on an outer periphery of the expanding pieces (341). The tightening member (34) passes through the second threaded section (312) of the shaft rod (31) through the axial hole (342), and the expanding pieces (341) is configured to cover around the tapered portion (334) of the pushing member (33). Also, a rear end of the tightening member (34) and the second threaded section (312) are connected and secured through a threaded lock member (35), and the tapered portion (334) of the pushing member (33) and the tightening member (34) are inserted into the outer tube (20).

[0028] Furthermore, a second locating portion (316) is protrudingly formed on shaft rod (31) adjacent to the first threaded section (311), and a soft column (317) is sleeved onto the shaft rod (31) and limited between first locating portion (313) and the second locating portion (316), and an outer diameter of the soft column (317) is larger than an outer diameter of the washer (314), so as to position the shaft rod (31) at center position and to prevent the washer (314) from colliding with an inner wall of the inner tube (10), thus reducing noise.

[0029] An end of the axial hole (342) of the tightening member (34) is recessed and formed with a reduced-diameter section (344), and the threaded lock member (35) has a rivet nut (351) and first nut (352). The rivet nut (351) is embedded into the reduced-diameter section (344), and a third threaded section is formed on an inner periphery of the rivet nut (351) to engage with the second threaded section (312), and the first nut (352) is threaded onto an end of the second threaded section (312) and abutted against a bottom of the tightening member (34).

[0030] Structurally, referring to FIGS. 3 to 5, the linkage member (30) is first assembled by attaching the connecting block (32) onto the first threaded section (311) of the shaft rod (31), and then the second threaded section (312) is inserted upward through the washer (314) and the first spring (315). The washer (314) is fixed to the first locating portion (313) of the shaft rod (31), thereby limiting the position of the first spring (315) at a lower half of the shaft rod (31). The tapered portion (334) of the pushing member (33) is faced downward, and the axial channel (331) of the pushing member (33) is adapted to upward pass through the second threaded section (312) to connect the pushing member (33) to the shaft rod (31), and meanwhile, the first spring (315) is abutted between the washer (314) and the pushing member (33), and the shaft rod (31), along with the connecting block (32) and the pushing member (33), is assembled with the inner tube (10). The shaft rod (31) is upward inserted into the inner tube (10) through the connecting block (32), and the socket portion (332) of the pushing member (33) is press-fitted and fixed to an inner periphery of a bottom end of the inner tube (10), and the locating ring section (335) is engaged to abut against and limit the bottom end of the inner tube (10), allowing the second threaded section (312) to extend outward from the pushing member (33). The assembly slot (322) of the connecting block (32) is faced to the through hole (111) of the inner tube (10), and the linkage portion (132) of the pulling portion (13) is inserted through the penetrating slot (124) and the through hole (111) to engage and connect with the assembly slot (322) of the connecting block (32). Meanwhile, the connecting portion (131) of the pulling portion (13) is pivotally mounted to the first pivot portion (122) of the connecting sleeve (12) so as to form a lever fulcrum, so that the shaft rod (31) is configured to move up and down in response to the lever action of the pulling portion (13). The expanding pieces (341) of the tightening member (34) are annularly arranged to surround and cover the tapered portion (334) of the pushing member (33), and the axial hole (342) is sleeved onto the second threaded section (312), and the tightening member (34) is secured onto the second threaded section (312) through the threaded lock member (35). The inner tube (10) is assembled and inserted into the outer tube (20) through the open tube port (22), and the locating plane (231) of the outer tube sleeve (23) is coupled and secured with the guiding plane (11) of the inner tube (10), thereby restricting rotational movement of the inner tube (10) within the outer tube (20), so as to complete the structure of the telescopic walking cane.

[0031] In actual application, referring to FIG. 4, when the pulling portion (13) is not operated, the shaft rod (31) is pushed upward by the first spring (315), thereby causing the tightening member (34) to be normally positioned around the tapered portion (334) of the pushing member (33). Through the gradually upward expanding design of the tapered portion (334), the expanding pieces (341) are outwardly spread, such that an outer periphery of the expanding pieces (341) of the tightening member (34) are abutted against an inner wall of the outer tube (20), thereby establishing a fixed state of the outer tube (20). When the user assists in walking with the walking cane of the present invention, the cane is used to support the body, causing a shift in the user's center of gravity onto the walking cane, and the force is transmitted along the inner tube (10) to the outer tube (20). Since the inner tube (10) is downward pressed by the user, and the outer tube (20) is resisted against the ground with an upward reaction force, the pushing member (33) and the tightening member (34) of the linkage member (30) are urged against each other, and the pressing effect is enhanced between them, so as to effectively prevent the outer tube (20) from sliding along the inner tube (10), thereby ensuring the stability of the walking cane and improving the safety of walking assistance with the walking cane.

[0032] Furthermore, when the user needs to adjust the length of the walking cane, as shown in FIGS. 5 to 9, the locking cover (14) is opened by being flipped downward, and the pulling portion (13) is disengaged from the blocking state of the locking cover (14) and become operable for lever action. During lever action, the user can directly pull upward the pulling portion (13) by using their index or middle finger while holding the first handle (15), so as to facilitate the adjustment of the walking cane's length. When the pulling portion (13) is pulled, the connecting portion (131) severs as the pivot point for the upward lever action, and through the linkage portion (132), the connecting block (32) is pushed downward. As a result, the shaft rod (31) moves downward along with the displacement of the connecting block (32), and the first spring (315) is compressed through the washer (314). Simultaneously, the tightening member (34) at the second threaded section (312) of the shaft rod (31) moves downward to disengage from the tapered portion (334) of the pushing member (33), causing the tightening member (34) to enter a non-expanded state, and the elastic ring (343) then forces the expanding pieces (341) of the tightening member (34) to be retracted. Accordingly, the inner wall of the outer tube (20) is no longer supported and fixed by the tightening member (34), allowing the walking cane to be lifted off the ground. Also, the outer tube (20) can then naturally slide downward by its own weight, enabling extension of the walking cane. Alternatively, by pressing the walking cane downward against the ground, the outer tube (20) moves upward along the inner tube (10), resulting in a shortening adjustment, so as to achieve the purpose of stepless telescopic adjustment. After the adjustment, the pulling portion (13) is released to allow the shaft rod (31) to move upward through the rebound force of the first spring (315), and the movement also causes the pulling portion (13) to return to its original position into non-levered state. Meanwhile, the tightening member (34) is moved upward along with the shaft rod (31) and guided along the tapered portion (334) of the pushing member (33) to return to the expanded state. Furthermore, the expanding pieces (341) then once again press tightly against the inner wall of the outer tube (20) into the positioning state, so as to allow the telescopic adjustment of the walking cane to be completed quickly and easily. Then, the locking cover (14) is flipped upward and latched into the place to prevent accidental activation of the pulling portion (13), thereby ensuring its locked state. As a result, when the walking cane is used for walking on stairs, the user can quickly adjust it to a suitable length according to their arm length and the height of the steps. Similarly, when transitioning from a seated to a standing position, the user can utilize the shortened cane to brace against the ground for assisted standing, so as to significantly enhancing the practicality of the walking cane.

[0033] Comparing with conventional walking cane, the present invention is advantageous because: (i) the linkage member (30) is installed between the inner tube (10) and the outer tube (20), and the pushing member (33) of the linkage member (30) is fixedly mounted at the end of the inner tube (10) while the tightening member (34) of the linkage member (30) is movably extendable into the outer tube (20). Moreover, the shaft rod (31) is connected to the pulling portion (13) of the inner tube (10) through the connecting block (32) so as to allow the pulling portion (13) to control the vertical displacement of the shaft rod (31), and to drive the pushing member (33) and the tightening member (34) to have expand and tighten or contract and loosen status, thereby adjusting and securing the length between the inner tube (10) and the outer tube (20). The simple and labor-saving telescopic adjustment function allows the user to quickly and easily adjust to the desired length, making it especially suitable for elderly users with less strength or limited dexterity, thus enhancing ease of use; and (ii) the guiding plane (11) is formed on the outer periphery of the inner tube, and the inner wall of the outer tube sleeve (23) of the outer tube (20) has the locating plane (231) to couples with and corresponds to the guiding, so as to guide and restrict the movement of the inner tube (10), effectively preventing relative rotation between the inner tube (10) and the outer tube (20) during telescopic adjustment, and then enhancing the stability of the walking cane during use and while adjusting its length.

[0034] Having described the invention by the description and illustrations above, it should be understood that these are exemplary of the invention and are not to be considered as limiting. Accordingly, the invention is not to be considered as limited by the foregoing description, but includes any equivalents.

Claims

1. A walking cane comprising an inner tube, an outer tube, and a linkage member;wherein the inner tube has a guiding plane axially formed on the outer periphery thereof, and a through hole and a positioning hole respectively penetrate through a surface of an upper portion of the guiding plane; a connecting sleeve, connected with the inner tube at a position corresponding to the through hole and the positioning hole, comprises a first pivot portion and a second pivot portion, and the first pivot portion is formed in the shape of two lugs, and a penetrating slot penetrating through an inner surface and an outer surface of the connecting sleeve is formed between the two lugs; a positioning protrude formed on an inner wall of the connecting sleeve is connected and secured with the positioning hole; the first pivot portion is assembled with a pulling portion, and a connecting portion and a linkage portion are respectively formed at a central portion and a front end of the pulling portion; the linkage portion is adapted to pass through the penetrating slot and through hole into the inner tube, and the connecting portion is pivotally connected to the first pivot portion; the second pivot portion is assembled with a locking cover to restrict the movement of the pulling portion, and a first handle is formed on a top end of the inner tube;wherein the outer tube comprises an anti-slip pad connected at one end thereof, and an open tube port is formed at the other end of the outer tube; an outer tube sleeve is disposed on the open tube port, and a locating plane is formed on an inner periphery of the outer tube sleeve; the inner tube is inserted and assembled through the open tube port, and the guiding plane is coupled and aligned against the locating plane of the outer tube sleeve, thereby further restricting the rotation of the inner tube; andwherein the linkage member accommodated between the inner tube and the outer tube comprises a shaft rod, a connecting block, a pushing member, and a tightening member, and a first threaded section and a second threaded section are respectively formed on two ends of the shaft rod, and a first locating portion is protrudingly formed on a shaft body of the shaft rod to securely position a washer; a first spring is upwardly sleeved on the shaft rod from the second threaded section, and one end of the first spring is abutted against the washer to form a fixed position; one end of the connecting block is secured on the first threaded section of the shaft rod, and an assembly slot is formed at a lateral side of the connecting block to connect to the linkage portion of the pulling portion, and an axial channel axially penetrates through both ends of the pushing member; the axial channel pass through the second threaded section to sleeve the pushing member on the shaft rod, so as to restrict the first spring between the pushing member and the washer; a socket portion is formed at one end of the pushing member to connect to one end of the inner tube, and the socket portion has a second fitting plane to be coupled and secured with the guiding plane of the inner tube; the other end of the pushing member comprises a tapered portion, and a locating ring section is formed between the tapered portion and the socket portion to abut against an end edge of the inner tube; the tightening member comprises a plurality of adjacent expanding pieces arranged in a ring shape, and an axial hole is formed between the expanding pieces, and at least an elastic ring is disposed on an outer periphery of the expanding pieces; the tightening member passes through the second threaded section of the shaft rod through the axial hole, and the expanding pieces is configured to cover around the tapered portion of the pushing member; a rear end of the tightening member and the second threaded section are connected and secured through a threaded lock member, and the tightening member is inserted into the outer tube; the pulling portion is pulled to control the vertical displacement of the shaft rod, so as to drive the tightening member and pushing member into a tightening status or a loosen status, thereby adjusting and securing the length between the inner tube and outer tube.

2. The walking cane of claim 1, wherein an inner periphery of the connecting sleeve comprises a first fitting plane to be coupled and secured with the guiding plane of the inner tube, and the locking cover is pivotally and flipably mounted on the second pivot portion of the connecting sleeve; the locking cover has an open slot to allow one end of the pulling portion to penetrate therethrough, and an engaging protrude is formed on an inner wall of the locking cove, and an outer wall of the first pivot portion of the connecting sleeve comprises an engaging slot to engage with the engaging protrude, and the locking cover is configured to block the upward movement path of the pulling portion, thereby achieving the effect of locking the pulling portion.

3. The walking cane of claim 1, wherein an inner periphery of the outer tube comprises a buffer spring to abut against an upper portion of the anti-slip pad.

4. The walking cane of claim 1, wherein a non-circular tool hole is formed on the other end of the connecting block.

5. The walking cane of claim 1, wherein a second locating portion is protrudingly formed on shaft rod adjacent to the first threaded section, and a soft column is sleeved onto the shaft rod and limited between first locating portion and the second locating portion, and an outer diameter of the soft column is larger than an outer diameter of the washer.

6. The walking cane of claim 1, wherein an end of the axial hole of the tightening member is recessed and formed with a reduced-diameter section, and the threaded lock member has a rivet nut and first nut; the rivet nut is embedded into the reduced-diameter section, and a third threaded section is formed on an inner periphery of the rivet nut to engage with the second threaded section, and the first nut is threaded onto an end of the second threaded section and abutted against a bottom of the tightening member.

Images