ADJUSTIBLE WALKING CANE
An adjustable walking cane includes an inner tube, an outer tube, a connecting rod, a pushing unit and an extending unit. A spring compresses the connecting rod against the extending unit and the pushing unit, a resilient sleeve bears against the inner threaded segment on the outer tube, and then the length of the outer tube and inner tube can be fixed. In the extending process, the inner tube and the outer tube extend outwardly by pulling the cane from two ends thereof, and the inner tube and the outer tube are released from compression while the resilient sleeve is detached from the inner threaded segment. In the retracting process, the inner tube and the outer tube are released from compression while the extending pieces on the extending unit driven by controlling unit is detached from the taper surface of the pushing unit.
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The present invention relates to a walking cane, and more particularly to an adjustable walking cane that can be simply operated and adjusted.
BACK GROUND OF THE INVENTIONThe current adjustable walking cane (70) (as shown in
However, conventional adjustable walking cane (70) is disadvantageous because: (i) by tightening the outer threaded segment (811) of the sleeve (81), the resilient claw portion (821) of the annular compressible unit (82) bears against the taper base (90) to grip the interior surface of the first stem (71). The user need to exert more strength to compress the sleeve (81) forward to the annular compressible unit (82) while the position of the outer threaded segment (811) of the sleeve (81) is more closer to the taper base (90). Also, when the user exerts more strength on the first stem (71), the outer threaded segment (811) of the sleeve (81) is compressed tightly by the annular compressible unit (82), so the probability of getting stuck between the annular compressible unit (82) and the sleeve (81) and the difficulty of disengaging the second stem (72) by twisting for the user are increased; (ii) the length of the cane (70) is adjusted by twisting the outer threaded segment (811) of the sleeve (81) and the annular compressible unit (82). the twisting action is difficult for the user to perform while a surface of the second stem (72) is smooth; and (iii) the length of the cane (70) is fixed by bearing against the resilient claw portion (821) of the annular compressible unit (82) made of the plastic material to grip the interior surface of the first stem (71), and the frictional resistance is insufficient while the interior surface of the first stem (71) is smooth. Thus, the cane (70) is not reliable while the annular compressible unit (82) and the first stem (71) can not be engaged tightly. Therefore, there remains a need for a new and improved design for an adjustable walking cane to overcome the problems presented above.
SUMMARY OF THE INVENTIONThe present invention provides an adjustable walking cane, which comprises an inner tube, an outer tube, a connecting rod, a pushing unit and an extending unit. The inner tube is connected to a first handle at one end, and a protruding portion is formed at the other end thereof. A controlling unit having a cover at one end is formed adjacent the first handle, and a through hole is formed on the first handle for penetration by the other end of the controlling unit. The outer tube comprises a non-slip plug received at one end and a restricting cover is secured on the other end. A block portion is formed at an inner edge of the restricting cover for engaging with the protruding portion of the inner tube while the outer tube is connected to the inner tube, and an inner threaded segment is formed at an inner surface of the outer tube. The connecting rod driven by pressing the controlling unit is secured with the controlling unit at one end, and a threaded segment formed at the other end is connected to the outer tube, and a blocking piece is formed at a central portion thereof. The pushing unit having a tapered surface at one end is secured at an open end of the inner tube with the protruding portion thereon, and a connecting portion is formed at the other end thereof. The connecting portion is compressed against the inner tube, and a plurality of axial slots are formed thereon for increasing the deformation of the connecting portion by compression. An annular portion protruding from a middle portion of the pushing unit is compressed against the open end of the inner tube, and a rod hole is formed at a top portion of the pushing unit for penetrating by the end of the connecting rod with the threaded segment, and a spring is formed between the pushing unit and the blocking piece. The extending unit comprises an axial pore for connecting to the threaded segment on the end of the connecting rod, and a nut is fastened on the threaded segment for securing the positions of the extending unit and the pushing unit. A plurality of extending pieces is formed around the connecting rod, and a resilient sleeve is formed at an outer edge of an upper end thereof. A first tubular piece and a second tubular piece protruded from the extending pieces are formed for limiting the position of the resilient sleeve.
Comparing with conventional adjustable walking cane, the present invention is advantageous because: (i) the resilience of the spring compresses the connecting rod against the extending unit and the pushing unit, and the resilient sleeve bears against the inner threaded segment of the outer tube, and then the length of the outer tube and inner tube can be fixed. In extending process, the inner tube and the outer tube are extended outwardly by directly pulling the cane from two ends thereof, and the inner tube and the outer tube are released from compression while the resilient sleeve is detached from the inner threaded segment. In retracting process, by operating the controlling unit by the user, the inner tube and the outer tube are released from compression while the extending pieces on the extending unit driven by controlling unit is detached from the taper surface of the pushing unit, and the length of cane can be adjusted easily; (ii) the spring of the cane bears against the pushing unit and the blocking piece of the connecting rod, and the extending pieces on the extending unit compresses against the taper surface of the pushing unit, and the resilient sleeve compresses against the inner threaded segment while the taper surface compresses against the extending pieces. When the cane is in use, the pushing unit driven by the inner tube compresses against the expending unit, and the expending pieces on the expending unit is expanded by the pushing unit. Thus, the resilient sleeve tightly compresses against the inner threaded segment while the user exerts more strength on the first handle, and the adjustable walking cane is much reliable while the rugged thread of the inner thread segment and the resilience of the resilient sleeve increase the resistance between the resilient sleeve and the inner threaded segment; and (iii) the spring of the cane bears the connecting rod against the extending unit and the pushing unit, and the resilient sleeve is expanded against the inner threaded segment on the outer tube, and then the length of the outer tube and inner tube can be fixed. The controlling unit can be easily operated by axially detaching the taper surface of the pushing unit from the extending pieces and the resilience of the extending pieces and the resilient sleeve.
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.
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.
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.
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:
Referring to
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When in use, referring to
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In one embodiment, referring to
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. An adjustable walking cane comprising:
- an inner tube connecting to a first handle at one end, a protruding portion formed at the other end thereof; and a control unit disposed near the first handle;
- an outer tube comprising a non-slip plug received at one end and a restricting cover secured on the other end, and a block portion formed inside the restricting cover to engage with the protruding portion of the inner tube when the inner tube is received in the inner tube, and an inner threaded segment formed at an inner surface of the outer tube;
- a connecting rod connecting with the controlling unit at one end, and a threaded segment formed at the other end and connected to the outer tube, and a blocking piece formed at a central portion of the connecting rod;
- a pushing unit having a tapered surface at one end and secured at an open end of the protruding portion of the inner tube, and a connecting portion formed at the other end thereof; and a rod hole formed at a top portion of the pushing unit for the threaded segment of the connecting rod to penetrate, and a spring formed between the pushing unit and the blocking piece;
- an extending unit comprising an axial pore for connecting to the threaded segment of the connecting rod, and a nut fastened on the threaded segment for securing the extending unit and the pushing unit, wherein a plurality of extending pieces are formed around the connecting rod, and a resilient sleeve is disposed at an outer portion of the extending pieces, wherein the extending pieces compress against the taper surface of the pushing unit, while the resilient sleeve is compressed against the inner threaded segment on the outer tube, so the length of the outer tube and the inner tube is fixed.
2. The adjustable walking cane of claim 1, wherein a first tubular piece and a second tubular piece protruded from the extending pieces are formed for restricting the resilient sleeve.
3. The adjustable walking cane of claim 1, wherein an annular portion protruding from a middle portion of the pushing unit is compressed against the open end of the inner tube.
4. The adjustable walking cane of claim 1, wherein the connecting portion is compressed against the inner tube, and a plurality of axial slots are formed thereon to increase the degree of deformation of the connecting portion.
5. The adjustable walking cane of claim 1, wherein the controlling unit comprises a cover formed at one end, and a through hole formed on the first handle is penetrated by the other end thereof, and a connecting rod is driven by pressing the controlling unit.
6. The adjustable walking cane of claim 1, wherein a slot is formed at an upper end of the inner tube, and the controlling unit comprises a plug, a sleeve body and a second handle. The plug is secured on a top portion of the connecting rod, and a bolt is formed pivotally for securing the second handle on the sleeve body, and the sleeve body secured around the slot is disposed on the inner tube, and one end of the second handle penetrates through the slot to bear against the plug, and the connecting rod is driven by pressing the second handle.
Type: Application
Filed: Jun 24, 2015
Publication Date: Dec 31, 2015
Applicant: VALOR ENTERPRISE CO., LTD. (CHANGHUA)
Inventors: Shih-Fu Wang (Changhua), Hsiu-Chen Lai (Changhua)
Application Number: 14/749,152