IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0024653
(2013-09-12)
|
등록번호 |
US-9056035
(2015-06-16)
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발명자
/ 주소 |
- Ju, Shun-Yuan
- Lee, Gang-Hua
- Hu, Zheng-Yang
|
출원인 / 주소 |
- Cycling & Health Tech Industry R&D Center
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
11 |
초록
▼
A tractor assembly includes a connection unit which is connected between the tractor and the wheel chair. The connection unit includes a fixing member, a top link unit, a bottom link unit and a swing rod so as to form a four-link mechanism. The connection unit includes an engaging unit with an engag
A tractor assembly includes a connection unit which is connected between the tractor and the wheel chair. The connection unit includes a fixing member, a top link unit, a bottom link unit and a swing rod so as to form a four-link mechanism. The connection unit includes an engaging unit with an engaging section, and a position unit. The top link unit has a reception hole and the positioning unit has a push rod. When the push rod is located at the first position, the reception hole is closed. When the push rod is located at the second position, the push rod is retracted and the reception hole is exposed. The bottom link unit is pivoted about one end of the swing rod to move the other end of the swing rod to the position of the reception hole, the engaging section is inserted into the reception hole.
대표청구항
▼
1. A tractor assembly comprising: a tractor;a rear part;a connection unit which is connected between the tractor and the rear part, the connection unit having a fixing member whose middle section is fixed to a front end of the rear part, the fixing member having a first pivotal portion and a second
1. A tractor assembly comprising: a tractor;a rear part;a connection unit which is connected between the tractor and the rear part, the connection unit having a fixing member whose middle section is fixed to a front end of the rear part, the fixing member having a first pivotal portion and a second pivotal portion which is located below the first pivotal portion;a top link unit having a first end pivotably connected to the first pivotal portion, a second end of the top link unit connected to the tractor, the top link unit having a reception hole;a bottom link unit having a first pivotably connected to the second pivotal portion by a second pivot extending therethrough;a swing rod having a first end pivotably connected to the top link unit by a third pivot, a second end of the swing rod pivotably connected to a second end of the bottom link unit by a fourth pivot so that the swing rod, the fixing member, the top link unit and the bottom link unit form a four-link mechanism;an engaging unit having an engaging section and a second resilient member which provides a resilient force to the engaging section, anda positioning unit located on an outside of a connection plate of the top link unit and having a push rod, when the swing rod swings about the third pivot by a first angle relative to the top link unit, the front end of the rear part lifts up and the engaging section and the push rod are located to be aligned with the reception hole, the engaging section is pushed by the resilient force from the second resilient member and inserted into the reception hole, the push rod is able to push the engaging section out from the reception hole. 2. The tractor assembly as claimed in claim 1, wherein the tractor has a driving unit, a steerer tube, a head tube, a front fork and a wheel, the driving unit is connected to a top of the steerer tube, a lower end of the steerer tube is rotatably connected to a top of the head tube by a headset, a lower end of the head tube is rotatably connected to the front fork by the headset, a lower end of the front fork is pivotably connected to an axle of the wheel. 3. The tractor assembly as claimed in claim 2, wherein the driving unit has a crank unit and a transmission unit, the crank unit has a crank and a handle connected to the crank, the handle and the crank are rotated to generate a force which is transmitted by the transmission unit to drive the wheel. 4. The tractor assembly as claimed in claim 1, wherein the rear part is a wheel chair which has a frame, two rear wheels connected to a rear end of the frame and two front wheels connected to a front end of the frame, two hanger brackets are respectively connected to two sides of the front end of the frame, and each hanger bracket has a footplate connected to a lower end thereof, the two respective middle sections of the two hanger brackets are secured by a securing portion of the fixing member. 5. The tractor assembly as claimed in claim 1, wherein two adjustment units are connected to two sides of the tractor, two rods are connected to the two adjustment units respectively, each rod has a straight section and a bent section, the adjustment units control the two rods to be pivoted to a first angular position and a second angular position, when the two rods are pivoted to the first angular position, two distal ends of the two bent sections of the two rods are folded and located above a ground, when the two rods are pivoted to the second angular position, the two distal ends of the two bent sections of the two rods contact the ground. 6. The tractor assembly as claimed in claim 5, wherein the adjustment units each have a sleeve, a first slide pin, a second slide pin and at least one resilient member, the sleeve has an opening defined in at least one end thereof, two sidewalls of the opening each have a first slot, a second slot is defined axially in each of the sidewalls and located beneath the first slot, an extension space is angularly formed at a distal end of the second slot, the first slide pin extends through first slots and the rod, the second slide pin transversely extends through the two second slots and the rod, the at least one resilient member is biased between an inner end of the sleeve and the second slide pin, when the first and second slide pins are located at two respective top ends of the first and second slots, the two rods are located at the first angular position, when the first slide pin is located at the middle portion of the first slot and the second slide pin is located a distal end of the extension space of the second slot, the two rods are located at the second angular position. 7. The tractor assembly as claimed in claim 6, wherein the first and second slide pins each have an enlarged section on two ends thereof, the two enlarged sections are exposed and in contact with an outside of the first slot or the second slot. 8. The tractor assembly as claimed in claim 1, wherein the fourth pivot is a tubular member and has one closed end, a through hole is defined in the other end of the fourth pivot, the engaging unit has the second resilient member, the engaging section has a first flange extending outward and radially from a middle portion thereof, the second resilient member is biased between the first flange and an inside of the closed end of the fourth pivot, the engaging section extends through the first through hole and is engaged with the reception hole by a force from the second resilient member. 9. The tractor assembly as claimed in claim 1, wherein the positioning unit has a tube in which the push rod is movably located, and a third resilient member, the tube has a second through hole defined axially therethrough and the second through hole communicates with the reception hole, the second through hole comprises a first hole, a second hole and a third hole, the second hole has the maximum diameter, the push rod has a second flange on one end thereof and the second flange is engaged with the first hole, the push rod has a second flange extending from a middle portion thereof and the second flange is engaged with the second hole, the third resilient member is located between the second hole and the third flange, when the push rod is located at the first position, the second flange extends through the first hole, the push rod is pushed by the third resilient member and inserted into the third hole so as to seal the reception hole, when the push rod is located at the second position, the second flange contacts an outside of the first hole and the push rod is retracted and the reception hole is exposed. 10. The tractor assembly as claimed in claim 1, wherein the top link unit has a top link and the connection plate which is located close to a first end of the top link, a second end of the top link is pivotably connected to the first pivotal portion by a first pivot, the first end of the top link is connected to the tractor, the reception hole and the third pivot are connected to the connection plate.
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