초록 ▼

A foldable crutch includes an upper rod having a pad portion on a top end thereof and a first coupling portion at a bottom end thereof. The first coupling portion includes at least one positioning groove and a receiving groove. A handle is disposed on the upper rod. A lower rod includes an upper end

A foldable crutch includes an upper rod having a pad portion on a top end thereof and a first coupling portion at a bottom end thereof. The first coupling portion includes at least one positioning groove and a receiving groove. A handle is disposed on the upper rod. A lower rod includes an upper end having a second coupling portion mounted to the first coupling portion. The second coupling portion includes a positioning member for coupling with the positioning groove or the receiving groove. A turn knob is mounted to the first coupling portion. An axle extends through the first and second coupling portions and is pivotably connected to the turn knob. An elastic element biases the first and second coupling portions to disengage the positioning member from the at least one positioning groove when the turn knob is in the unlocking position.

대표청구항 ▼

1. A foldable crutch comprising: an upper rod including a pad portion on a top end thereof, wherein the upper rod further includes a first coupling portion on a bottom end thereof, wherein the first coupling portion includes a first outer surface and a first inner surface, wherein the first coupling

1. A foldable crutch comprising: an upper rod including a pad portion on a top end thereof, wherein the upper rod further includes a first coupling portion on a bottom end thereof, wherein the first coupling portion includes a first outer surface and a first inner surface, wherein the first coupling portion further includes a central portion having a first axle hole extending from the first outer surface through the first inner surface, wherein the first coupling portion further includes a peripheral portion surrounding the first axle hole, wherein at least one positioning groove and a receiving groove are defined in the peripheral portion and are spaced from each other in an angular direction;a handle mounted on the upper rod;a lower rod including an upper end having a second coupling portion mounted to the first coupling portion, wherein the second coupling portion includes a second outer surface, a second inner surface, and a second axle hole extending from the second outer surface through the second inner surface, wherein a positioning member is disposed on the second inner surface and is engaged in the at least one positioning groove or the receiving groove; anda locking device including a turn knob, an axle, an elastic element, and an assembling piece, wherein the turn knob includes a gripping portion and a pivotal portion connected to the gripping portion, wherein the pivotal portion of the turn knob is mounted to the first coupling portion of the upper rod, wherein the pivotal portion of the turn knob includes a first side corresponding to a locking position and a second side corresponding to an unlocking position, wherein the first side extends at a non-parallel angle to the second side, wherein the axle includes a first side having a pivotal portion pivotably connected to the pivotal portion of the turn knob, wherein the axle further includes a second side having a shank portion extending through the first axle hole and the second axle hole, wherein the elastic element biases the first coupling portion and the second coupling portion to disengage the positioning member from the at least one positioning groove when the turn knob is in the unlocking position, wherein the assembling piece has a width larger than a diameter of the second axle hole, wherein the assembling piece is disposed on the second coupling portion and is coupled to an end of the shank portion of the axle,wherein when the turn knob is in the locking position, the first side of the turn knob faces the first axle hole, the second coupling portion is pulled by the axle toward the first coupling portion, such that the positioning member engages with the at least one positioning groove, andwherein when the turn knob is turned to the unlocking position, the second side of the pivotal portion of the turn knob faces the first axle hole, the positioning member disengages from the at least one positioning groove, and the upper rod is pivotable relative to the lower rod to a folding state, and wherein when the turn knob is moved back to the unlocking position while the first rod and the second rod are in the folding state, the positioning member is engaged in the receiving groove. 2. The foldable crutch as claimed in claim 1, wherein the first inner surface of the first coupling portion includes a flange around the first axle hole, wherein the second inner surface of the second coupling portion includes an annular groove around the second axle hole and located corresponding to the flange of the first coupling portion, and wherein the elastic element is a compression spring mounted in the annular groove of the second coupling portion and includes two ends respectively abutting the first coupling portion and the second coupling portion. 3. The foldable crutch as claimed in claim 1, wherein the first outer surface of the first coupling portion includes a central portion having a first recessed portion around the first axle hole, wherein an abutment plate is mounted in the first recessed portion, wherein the pivotal portion of the turn knob is received in the first recessed portion, wherein the second outer surface of the second coupling portion includes a second recessed portion around the second axle hole, wherein the shank portion of the axle includes a connecting end extending in the second recessed portion and having a threaded portion, wherein the assembling piece is received in the second recessed portion and has a screw hole in threading connection with the threaded portion of the connecting end of the axle. 4. The foldable crutch as claimed in claim 3, wherein the second recessed portion of the second coupling portion includes an engagement hole, wherein the locking device further includes a cap, wherein the cap includes a head and a tab extending from the head, wherein the tab of the cap engages with the engagement hole of the second coupling portion, and wherein the head of the cap covers the second recessed portion. 5. The foldable crutch as claimed in claim 1, wherein the at least one positioning groove of the first coupling portion includes a plurality of positioning grooves located in a range of 180° around the first axle hole, wherein the receiving groove extends another 180° around the first axle hole, wherein a limiting groove is disposed in the receiving groove, wherein a limiting member protrudes from the second inner surface of the second coupling portion, is longer than the positioning member, and is movable in the limiting groove. 6. The foldable crutch as claimed in claim 1, further comprising a supporting rod, wherein the lower rod includes a central portion having a coupling groove, wherein the lower rod includes a lateral wall having a coupling hole in communication with the coupling groove, wherein the supporting rod is mounted to a lower end of the lower rod and includes an upper end having a coupling section and a lower end having a supporting section, wherein the coupling section includes a plurality of coupling holes at different heights, and wherein a coupling knob extends through one of the plurality of coupling holes of the coupling section into the coupling hole of the lower rod. 7. The foldable crutch as claimed in claim 1, further comprising a supporting rod mounted to a lower end of the lower rod, wherein the supporting rod includes an upper end having a coupling section and a lower end having a supporting section, wherein the coupling section is coupled to the lower rod, wherein the supporting section includes a rectilinear section connected to a lower end of the coupling section, wherein the rectilinear section includes an arcuate portion at a lower end thereof, wherein the arcuate portion includes a central, upper portion connected to the rectilinear portion and a bend portion that is elastic, wherein the arcuate portion further includes a bottom adapted to contact with a ground and located below the bend portion, wherein the bend portion includes an upper inner face and a lower inner face, wherein an upper abutting plate protrudes from the upper inner face, and wherein a lower abutting plate protrudes from the lower inner face and is spaced from the upper abutting plate by a spacing. 8. The foldable crutch as claimed in claim 1, wherein the upper rod includes a central portion having a plurality of coupling holes located at different heights, wherein the handle includes a handgrip and a connecting knob, wherein the handgrip is disposed on the upper rod and includes an engaging portion on a side thereof, wherein the engaging portion includes a coupling hole, wherein the engaging portion is mounted to one of the different heights, and wherein the connecting knob extends through one of the plurality of coupling holes of the upper rod into the coupling hole of the handle. 9. The foldable crutch as claimed in claim 1, further comprising a shoulder strap disposed on the pad portion. 10. The foldable crutch as claimed in claim 9, wherein the upper rod includes a coupling peg on a top end thereof, wherein the pad portion includes a pad having a coupling hole located corresponding to the coupling peg, wherein the shoulder strap includes an engaging hole for coupling with the coupling peg, wherein the shoulder strap includes two connecting ends at two ends thereof, wherein the two connecting ends are detachably coupled with each other, and wherein a fastener extends through the coupling hole of the pad into the coupling peg.