IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0074451
(2011-03-29)
|
등록번호 |
US-8166737
(2012-05-01)
|
우선권정보 |
JP-2010-079262 (2010-03-30) |
발명자
/ 주소 |
- Ninomiya, Yusuke
- Iida, Tetsuo
- Hirose, Nobuyuki
- Ohba, Mai
|
출원인 / 주소 |
|
대리인 / 주소 |
Carrier Blackman & Associates, P.C.
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
10 |
초록
▼
A walk-behind lawnmower having a height adjusting mechanism for adjusting the height of a housing above the ground. The height adjusting mechanism includes: a front wheel supporting member and a rear wheel supporting member that are attached to the housing so as to be capable of swinging up and down
A walk-behind lawnmower having a height adjusting mechanism for adjusting the height of a housing above the ground. The height adjusting mechanism includes: a front wheel supporting member and a rear wheel supporting member that are attached to the housing so as to be capable of swinging up and down; a linking member for linking the front and rear wheel supporting members so as to be capable of concerted motion; and a locking mechanism for restricting and releasing displacement of the linking member in the forward-and-backward direction. The locking mechanism includes: a plurality of locking grooves arranged in a row from front to rear on the linking member; a locking pin capable of selectively interlocking with one of the locking grooves; a pin-guiding part for guiding the locking pin to be capable of entering into and retracting from one of the locking grooves; and an operating member for sliding and operating the locking pin.
대표청구항
▼
1. A walk-behind lawnmower designed to travel under motor power or manpower while cutting grass, the walk-behind lawnmower comprising: a housing;a blade, housed within the housing, for cutting away the grass; anda height adjusting mechanism for adjusting a height of the housing and the blade with re
1. A walk-behind lawnmower designed to travel under motor power or manpower while cutting grass, the walk-behind lawnmower comprising: a housing;a blade, housed within the housing, for cutting away the grass; anda height adjusting mechanism for adjusting a height of the housing and the blade with respect to the ground,wherein the height adjusting mechanism includes: front wheel supporting members, linked vertically swingably to a front part of the housing, for supporting front wheels;rear wheel supporting members, linked vertically swingably to a rear part of the housing, for supporting rear wheels;a linking member for linking together the front wheel supporting members and the rear wheel supporting members so as to enable the front wheel supporting members and the rear wheel supporting members to move in an interlocked manner, the linking member being displaceable in a forward-and-backward direction and in a vertical direction in correspondence with swinging movements of the front wheel supporting members and the rear wheel supporting members; anda locking mechanism for restricting and releasing the displacement of the linking member in the forward-and-backward direction, the locking mechanism including:a plurality of locking grooves formed in a row from front to rear on the linking member; a locking pin capable of selectively interlocking with one of the locking grooves, the locking pin being substantially J-shaped and comprising a link-receiving part at an upper end thereof, a first perpendicular part that extends downwardly from the link-receiving part, a horizontal interlocking part that extends laterally from the lower end of the first perpendicular part, and a second perpendicular part that extends upwardly from the interlocking part;a pin-guiding part, provided to the housing, for slide-guiding the locking pin in an entry-retraction direction with respect to one of the grooves; andan operating member, provided to the housing, for slide-operating the locking pin. 2. The lawnmower of claim 1, wherein each of the locking grooves comprises a U-shaped groove with an upper end sloping downward from an upper-end surface of the linking member, and the upper-end surface of the linking member comprises an arcuate surface formed in a concave arcuate shape across a portion at which the upper ends of the locking grooves are positioned, the arcuate shape corresponding to a displacement track of the linking member in the forward-and-backward and vertical directions. 3. The lawnmower of claim 2, wherein the linking member has front and rear spaced apart vertical projections extending upwardly thereon at an intermediate portion thereof, each of the vertical projections including an inner wall, wherein the inner wall of the front vertical projection faces toward the inner wall of the rear vertical projection, and wherein at least one of the inner walls of said front and rear spaced apart vertical projections defines a pin-contacting surface on an edge portion of one of the locking grooves, and comprises a stepped part sloping upwardly at a region above the pin-contacting surface. 4. The lawnmower of claim 1, wherein the housing has a notch formed in outer side edge portion thereof adjacent one of the wheels, the notch forming a peephole, and further comprising a height-indicating member attached to one of said wheel-supporting members proximate said notch, the height-indicating member having an arcuately shaped outer circumferential surface formed on an upper edge portion thereof and having a plurality of indicia thereon, wherein a selected one of said indicia is visible through the peephole formed in the outer side edge portion of the housing. 5. The lawnmower of claim 4, wherein the base portion of the height-indicating member has a mounting hole formed therein to receive a bolt. 6. The lawnmower of claim 1, wherein the linking member has front and rear spaced apart vertical projections extending upwardly thereon at an intermediate portion thereof, each of the vertical projections including an inner wall, wherein the inner wall of the front vertical projection faces toward the inner wall of the rear vertical projection, and wherein at least one of the inner walls of said front and rear spaced apart vertical projections defines a pin-contacting surface on an edge portion of one of the locking grooves, and comprises a stepped part sloping upwardly at a region above the pin-contacting surface. 7. The lawnmower of claim 1, wherein the pin-guiding part comprises a base portion and a guiding portion that is formed integrally on the base portion, the guiding portion having a first guide groove formed substantially vertically therein for receiving the first perpendicular part of the locking pin, a second groove formed substantially vertically therein on a side opposite the first guide groove for receiving the second perpendicular part of the guide pin, and a third guide groove formed substantially horizontally therein and extending between the first guide groove and the second guide groove to allow passage of the interlocking part. 8. A walk-behind lawnmower designed to travel under motor power or manpower while cutting grass, the walk-behind lawnmower comprising: a housing having a notch formed in outer side edge portion thereof, the notch defining a peephole;a blade, housed within the housing, for cutting away the grass; anda height adjusting mechanism for adjusting a height of the housing and the blade with respect to the ground,wherein the height adjusting mechanism includes: front wheel supporting members, linked vertically swingably to a front part of the housing, for supporting front wheels;rear wheel supporting members, linked vertically swingably to a rear part of the housing, for supporting rear wheels;a height-indicating member attached to one of said wheel-supporting members proximate said notch, the height-indicating member having an arcuately shaped outer circumferential surface formed on an upper edge portion thereof and having a plurality of indicia thereon, wherein a selected one of said indicia is visible through the peephole formed in the outer side edge portion of the housing;a linking member for linking together the front wheel supporting members and the rear wheel supporting members so as to enable the front wheel supporting members and the rear wheel supporting members to move in an interlocked manner, the linking member being displaceable in a forward-and-backward direction and in a vertical direction in correspondence with swinging movements of the front wheel supporting members and the rear wheel supporting members; anda locking mechanism for restricting and releasing the displacement of the linking member in the forward-and-backward direction, the locking mechanism including:a plurality of locking grooves formed in a row from front to rear on the linking member;a locking pin capable of selectively interlocking with one of the locking grooves;a pin-guiding part, provided to the housing, for slide-guiding the locking pin in an entry-retraction direction with respect to one of the grooves; andan operating member, provided to the housing, for slide-operating the locking pin. 9. The lawnmower of claim 8, wherein each of the locking grooves comprises a U-shaped groove with an upper end sloping downward from an upper-end surface of the linking member, and the upper-end surface of the linking member comprises an arcuate surface formed in a concave arcuate shape across a portion thereof at which the upper ends of the locking grooves are positioned, the arcuate shape corresponding to a displacement track of the linking member in the forward-and-backward and vertical directions. 10. The lawnmower of claim 8, wherein the locking pin is substantially J-shaped and comprises a link-receiving part at an upper end thereof, a first perpendicular part that extends downwardly from the link-receiving part, a horizontal interlocking part that extends laterally from the lower end of the first perpendicular part, and a second perpendicular part that extends upwardly from the interlocking part. 11. The lawnmower of claim 10, wherein the pin-guiding part comprises a base portion and a guiding portion that is formed integrally on the base portion, the guiding portion having a first guide groove formed substantially vertically therein for receiving the first perpendicular part of the locking pin, a second groove formed substantially vertically therein on a side opposite the first guide groove for receiving the second perpendicular part of the guide pin, and a third guide groove formed substantially horizontally therein and extending between the first guide groove and the second guide groove to allow passage of the interlocking part. 12. The lawnmower of claim 8, wherein the height-indicating member comprises a base portion having a mounting hole formed therein to receive a bolt. 13. The lawnmower of claim 8, wherein the linking member has front and rear spaced apart vertical projections extending upwardly thereon at an intermediate portion thereof, each of the vertical projections including an inner wall, wherein the inner wall of the front vertical projection faces toward the inner wall of the rear vertical projection, and wherein at least one of the inner walls of said front and rear spaced apart vertical projections defines a pin-contacting surface on an edge portion of one of the locking grooves, and comprises a stepped part sloping upwardly at a region above the pin-contacting surface. 14. The lawnmower of claim 9, wherein the linking member has front and rear spaced apart vertical projections extending upwardly thereon at an intermediate portion thereof, each of the vertical projections including an inner wall, wherein the inner wall of the front vertical projection faces toward the inner wall of the rear vertical projection, and wherein at least one of the inner walls of said front and rear spaced apart vertical projections defines a pin-contacting surface on an edge portion of one of the locking grooves, and comprises a stepped part sloping upwardly at a region above the pin-contacting surface. 15. A walk-behind lawnmower designed to travel under motor power or manpower while cutting grass, the walk-behind lawnmower comprising: a housing;a blade, housed within the housing, for cutting away the grass; anda height adjusting mechanism for adjusting a height of the housing and the blade with respect to the ground,wherein the height adjusting mechanism includes: front wheel supporting members, linked vertically swingably to a front part of the housing, for supporting front wheels;rear wheel supporting members, linked vertically swingably to a rear part of the housing, for supporting rear wheels;a linking member for linking together the front wheel supporting members and the rear wheel supporting members so as to enable the front wheel supporting members and the rear wheel supporting members to move in an interlocked manner, the linking member being displaceable in a forward-and-backward direction and in a vertical direction in correspondence with swinging movements of the front wheel supporting members and the rear wheel supporting members; anda locking mechanism for restricting and releasing the displacement of the linking member in the forward-and-backward direction, the locking mechanism including:a plurality of locking grooves formed in a row from front to rear on the linking member; a locking pin capable of selectively interlocking with one of the locking grooves, the locking pin being substantially J-shaped and comprising a link-receiving part at an upper end thereof, a first perpendicular part that extends downwardly from the link-receiving part, a horizontal interlocking part that extends laterally from the lower end of the first perpendicular part, and a second perpendicular part that extends upwardly from the interlocking part;a pin-guiding part, provided to the housing, for slide-guiding the locking pin in an entry-retraction direction with respect to one of the grooves, the pin-guiding part comprising a base portion and a guiding portion that is formed integrally on the base portion, the guiding portion having a first guide groove formed substantially vertically therein for receiving the first perpendicular part of the locking pin, a second groove formed substantially vertically therein on a side opposite the first guide groove for receiving the second perpendicular part of the guide pin, and a third guide groove formed substantially horizontally therein and extending between the first guide groove and the second guide groove to allow passage of the interlocking part; andan operating member, provided to the housing, for slide-operating the locking pin. 16. The lawnmower of claim 15, wherein the housing has a notch formed in outer side edge portion thereof adjacent one of the wheels, the notch forming a peephole, and further comprising a height-indicating member attached to one of said wheel-supporting members proximate said notch, the height-indicating member having an arcuately shaped outer circumferential surface formed on an upper edge portion thereof and having a plurality of indicia thereon, wherein a selected one of said indicia is visible through the peephole formed in the outer side edge portion of the housing. 17. The lawnmower of claim 15, wherein the linking member has front and rear spaced apart vertical projections extending upwardly thereon at an intermediate portion thereof, each of the vertical projections including an inner wall, wherein the inner wall of the front vertical projection faces toward the inner wall of the rear vertical projection, and wherein at least one of the inner walls of said front and rear spaced apart vertical projections defines a pin-contacting surface on an edge portion of one of the locking grooves, and comprises a stepped part sloping upwardly at a region above the pin-contacting surface.
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