CA1190161A - Combined clutch and brake mechanism - Google Patents
Combined clutch and brake mechanismInfo
- Publication number
- CA1190161A CA1190161A CA000443217A CA443217A CA1190161A CA 1190161 A CA1190161 A CA 1190161A CA 000443217 A CA000443217 A CA 000443217A CA 443217 A CA443217 A CA 443217A CA 1190161 A CA1190161 A CA 1190161A
- Authority
- CA
- Canada
- Prior art keywords
- brake
- clutch
- drum
- shoe
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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Abstract
ABSTRACT OF THE DISCLOSURE
Disclosed herein is a combined brake and clutch mechanism comprising a drive member mounted for rotation and including thereon a clutch drum, a driven member carried for rotation coaxially with and relative to the drive member, a clutch shoe pivotally connected to the driven member for common rotation therewith and for movement relative to a position of engagement with the clutch drum, a spring urging the clutch shoe toward the position of engagement, a brake surface on the clutch shoe in radially outward relation to the clutch drum, and a brake member movable between a first position wherein the brake member is spaced from the brake surface, and a second position wherein the brake member engages the brake surface to brake rotation of the driven member and to displace the clutch shoe from the position of engagement against the action of the spring.
Disclosed herein is a combined brake and clutch mechanism comprising a drive member mounted for rotation and including thereon a clutch drum, a driven member carried for rotation coaxially with and relative to the drive member, a clutch shoe pivotally connected to the driven member for common rotation therewith and for movement relative to a position of engagement with the clutch drum, a spring urging the clutch shoe toward the position of engagement, a brake surface on the clutch shoe in radially outward relation to the clutch drum, and a brake member movable between a first position wherein the brake member is spaced from the brake surface, and a second position wherein the brake member engages the brake surface to brake rotation of the driven member and to displace the clutch shoe from the position of engagement against the action of the spring.
Description
~s~
Title COMBINED CLUTCH ~ BRAKæ
Inventor GP'RALD H~ ~JICK
RE~ATED APP~ICATION
This application is a division of application serial 278,286 filed May 12, 1977.
BACKGROUMD OF THE INV~NTIO~
The in~ention relates generally to combined clutch and brake mechanisms in which rotation of a d~iven element is simultaneously brak2d incident to disengagement of the clutch~
Attention is directed to the United States Hoff Patent 3,026,665 issued March Z7, 1962 and to the United States Meldahl Patent 3,253,391 issued May 31, 1966.
SUMM~RY OF THE INVENTION
The invention provides a combined brake and clutch mechanism com~rising a drive member mounted for rotation and including thereon a clutch drum, a driven member carried for rotation coaxially with and relative to the drive member, a clutch shoe pivotally connected to the driven member for common rotation ~herewith and for movement relative to a position of en~a~ement with the clutch drum, biasing means for urging ~he clutch shoe toward the position of engagement, a brake surface on the clutch shoe in radially outward relation to the clutch drum, and a brake member movable between a first position wherein the brake member i~ spaced E~om the brake su~face, and a second position wherein the brake member engages the brake surface to ~cake rotation o~ the driven member and to displace the clutch shoe from the positio~ of engagement against the action o~ the biasing ~eans.
The invention also provides a clutch mechanism comprising a rota~able drive member, a driven member, a drum carried on ~he drive member. a clutch shoe pivot~lly carried on the driven member for common rotation therewith and for movement radially in a given plane normal to the axis of the drive member and relative to the driven member and into and out of a position of clutching engagement with the drum, means biasing the clutch shoe into the position of engagement with the drum to drivingly clu~ch ~oge~her the drive and driven members, a brake ~urface on the clutch shoe in radially outward relation to the clutch drum, and a brake member movable between a first position wherein the brake member is spaced from the brake surface, and a second position wherein the brake member engages the brake sur~ace to brake rotation of the driven member and to displace the clutch shoe from ~he position of engagement against the action o~ the biasing means and without in~errupting ~he rotation o~ the drive memher, which brake member is generally disposed in and acts in the given plane.
3l.~ 7~
The inverltion al80 provides a clutch mechanism comprising rotatable d~ive and driven members, a d~um carried on the drive member, a clutch shoe pivotally carried on the driven member and mo~able relative thereto and into and out of clutchi~g engag~ment with the drum, which clutch shoe includes a clutch surface engageable with the drum and a brake 6urface radially spaced from the clutch surface and in radially outward relation ~o ~he drum, means for biasing the shoe into the po~ition o~
engagement with ~he drum to drivingly clutch together the dri~e and driven members, and a brake member movable between a first position wherein the brake member i8 spaced from the brake surface, and a second position wherein the brake member engages the brake surface to brake rotation of the dIiven member and to displace the clutch shoe from the position of engagement agains~ the ac~ion of the biasing means and withou~ inter~upting the ro~ation o~ the drive member.
In one embodiment o~ ~he invention, the combined brake and clutch mechanism also includes means biasing the brake member to the second position and normally overpowering the clutch shoe biasing means.
Xn one embodiment of the invention, ~he brake member comprises a brake band extending around the clutch shoe and having one end thereof secured to a fixed anchor, and the opposite end thereof secured to a movable anchor which brake band is self-energizing upon initial contact with the clutch ~¢~
shoe when the di.rection of rotation of the clutch shoe in relation to the brake band is flom the movable anchor toward the fixed anchor.
Other features and advan~ages of ~he embodiments of the invention will become known by reference to the following general descrip~ion, claims, and appended dLawings.
THE DRAWINGS
Figure l is an elevational view of a lawn mower embodying various of the fea~ures of the invention.
Figure 2 is an enlarged view, partially schematic and partially in section, of a com~ined clutch and brake mechanism which can be incorporated in the lawn mower shown in Figure l.
Figure 3 is a sectional view taken generally along line 3-~ of Figure ~.
Before explaining the embodiments of the invention in detail, it is to be understood that the invention i8 not limi~ed in i~s application ~o the details of construction and the arrangement of the components set forth in ~he following description or illustrated in the drawings. The invention is capable of other embodiments and of being ~s-practiced and carr~ed out in various r.7ays. Also it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limi~ing GENERAL DESCRIPTION
Shown in ~he drawings is ~ lawn mower 11 including a blade housing 13 which can be supported for travel over the ground in ny SUlt ble way, as for instance, by being slung under a trac~or or 10 forming a part of a ridlng ~over. I~ the illustrated construction, the blade ~ousing 13 is supported by a plurality of wheels 15.
Rotatably supported by the blade housing 13 is a drive shaft or member 17 which can be driven 15 in various ways, as for instancP' by a rem~te engine.
In the illustrated construction, the drive shaft 17 constitutes the lower end portion of the crank shaft of an inte~nal combustion engine 19 mounted on the blade housing 13.
Located within the cutter blade housing 13 for-relative ro~ation coaxially with ~he drive shaft 17, i5 a cutter blade assembly or driven member 21 which includes a cutter blade 24 located within the blade housing 13 and which is connected ~5 to the drive shaft 17 by a com~ined clutch and brake mechanism 23.
More specifically, the illustrated combined clutch and brake mechanism ~3 includes a centrifugal clutch 2.5 including a clutch drum 27 and cormected hub 28 which are keyed to and extend fix.edly from the drive shaft 17.
Engagable with the clutch drum 27 are one or more clutch shoes 31 (two diame~rically oppositely located shoes in the disclosed construction) which clutch shoes 31 are part of the cutter blade assembly 21 and are carried by a hub 41 about pivots in the form of pins 129 for luov~ t of che 10 clutch shoes 31 to and :Erom a clu~c:h drum Pngacring position. Retainer rings 130 are snap fitted onto the pins 129 to prevent movement of the clutch ~hoe~
31 a~ially of the pins 129~
As already indicated, means are provided 15 for ro~atably mounting the cutter blade 24 (and connected parts~ within the blade housing 13 for coaxial rotation relative to the drive shaft 17.
In the illustrated construction, the hub 41 includes a ~ounterbore 43 which receives one race 45 of a bearing 47 having a second ra~e 49 engaged with a shoulder 51 on the hu~ 28. The bearing race 45 is retained wi~hin the hub 41 by a ret~in;n~ ring 53 while the bearing race 49 is retained on ~he shoulder 51 on the hub 28 by a washer 55 and a headed bolt and lockwasher 57 which is axially threaded into the drive shaft 17 after passing through the hub 28~ ~-Means are provided or biasing the clutch shoe~31 into engagement with the clutch drum 27 so as to effect D~
ro~ation oE the cutter blade 24 in respon~e to ro~ation oE the drive sh~:Et 17. In the illustra~ed construction, such means comprises a yair of springs 61 which, at one end, are engaged against the free end of the clutch shoes 31 and, at the other end, against abutments 132 on the hub 41.
Means in the ~orm of a brake mechanism 70 are provided :Eor braking the cutter blade 24 against rotation and for simultanesouly overpowering ~he clutch shoe biasing means so as ~o disengag~ the clutch shoes 31 from the clutch drum 27. In t~e illus~rated construction, such means co~prises respective brake elements 71 whi h are respectively fixed to each of the clutch shoes 31 and which are generally of "L" shape including one leg 73 secured to the a s s o ciated clutch - shoe 31 by one or more fasteners 75 and a second generally semi-cyclindrical leg or braking surface 77 which extends in generally parallel and radially ou t ward relation to the clutch drum 27. The means for bra~ing the cutter blade 24 also includes a brake band or member 79 which is movably carried, at one end thereof, on a fixed pivot 81 extending from the blade housing 1~ and which extends in generally encircling, radially outwardly adjacent relation to the braking legs 77.
The brake band 79 is movable between a first position spaced from the braking legs or braking surfaces 77 so as to permit unhindered rotation oE the cutter blade 24 and a second posi~ion engaging the braking legs or braking surfaces 77 so as to brake rotation of the cutter blad~ and to simul~arleou~l.y displace ~ne clutch shoes 31 radially inwardly against the action of the clutch shoe biasing means or springs 61 and ou~ of engagement wi~h the clutch drum 27.
~leans are provided for hiasing the brake ban~ 79 to the position braking rotation of ~he cutter blade 24 and displacing the clutch shoes 31 away rom the ~lutch drum 27. In the illustrated con~truction, such means comprises a helical spring 85 con~e~ted, at one end thereof, to an anchor 87 extendin~ from the blade housing 13 znd, at the other end thereof 9 to the other or ~ree end o~ the brake band 79.
The lawn mower lL also include~ means for steering thereof such as, for instance~ the handle bar of a riding mower. In the illustrated construction, such means includes a handle 91 extending upwardly and rearwardly from the blade housing 13.
Means are pro~ided for manually over-riding the -.brake band biasing means. In the illustrated construction, such means comprises a hand operated lever 93 which is movably mounted on the handle 91 and which includes a hand operated part 95 movable between a position adjacent to the handle 9L a~d a position spaced from the handle 91. The over-riding means also includes a linkage 97 connecting the lever 93 to the brak~
25 band 79 such that the sprirlg 8~ is al~o e~fective to locate the hand operated part 95 in the position spaced from the handle ~1. Thus, whenever the hand operated part 95 is not held by the operator against or adjacent to the handle gl, the co~.bined clutch and`brake mechanism ?3 will operate to dise[lgage the clutch 25 and brake rotation of the cutter blade 2~ notwithstanding engine rotation.
Furthermore the engine 19 can be starter without causing rotation of the cutter blade 24 when the hand operater le~er part 95 is located in the spaced position.
Various of the features o~ the invention are set forth in the following claims,
Title COMBINED CLUTCH ~ BRAKæ
Inventor GP'RALD H~ ~JICK
RE~ATED APP~ICATION
This application is a division of application serial 278,286 filed May 12, 1977.
BACKGROUMD OF THE INV~NTIO~
The in~ention relates generally to combined clutch and brake mechanisms in which rotation of a d~iven element is simultaneously brak2d incident to disengagement of the clutch~
Attention is directed to the United States Hoff Patent 3,026,665 issued March Z7, 1962 and to the United States Meldahl Patent 3,253,391 issued May 31, 1966.
SUMM~RY OF THE INVENTION
The invention provides a combined brake and clutch mechanism com~rising a drive member mounted for rotation and including thereon a clutch drum, a driven member carried for rotation coaxially with and relative to the drive member, a clutch shoe pivotally connected to the driven member for common rotation ~herewith and for movement relative to a position of en~a~ement with the clutch drum, biasing means for urging ~he clutch shoe toward the position of engagement, a brake surface on the clutch shoe in radially outward relation to the clutch drum, and a brake member movable between a first position wherein the brake member i~ spaced E~om the brake su~face, and a second position wherein the brake member engages the brake surface to ~cake rotation o~ the driven member and to displace the clutch shoe from the positio~ of engagement against the action o~ the biasing ~eans.
The invention also provides a clutch mechanism comprising a rota~able drive member, a driven member, a drum carried on ~he drive member. a clutch shoe pivot~lly carried on the driven member for common rotation therewith and for movement radially in a given plane normal to the axis of the drive member and relative to the driven member and into and out of a position of clutching engagement with the drum, means biasing the clutch shoe into the position of engagement with the drum to drivingly clu~ch ~oge~her the drive and driven members, a brake ~urface on the clutch shoe in radially outward relation to the clutch drum, and a brake member movable between a first position wherein the brake member is spaced from the brake surface, and a second position wherein the brake member engages the brake sur~ace to brake rotation of the driven member and to displace the clutch shoe from ~he position of engagement against the action o~ the biasing means and without in~errupting ~he rotation o~ the drive memher, which brake member is generally disposed in and acts in the given plane.
3l.~ 7~
The inverltion al80 provides a clutch mechanism comprising rotatable d~ive and driven members, a d~um carried on the drive member, a clutch shoe pivotally carried on the driven member and mo~able relative thereto and into and out of clutchi~g engag~ment with the drum, which clutch shoe includes a clutch surface engageable with the drum and a brake 6urface radially spaced from the clutch surface and in radially outward relation ~o ~he drum, means for biasing the shoe into the po~ition o~
engagement with ~he drum to drivingly clutch together the dri~e and driven members, and a brake member movable between a first position wherein the brake member i8 spaced from the brake surface, and a second position wherein the brake member engages the brake surface to brake rotation of the dIiven member and to displace the clutch shoe from the position of engagement agains~ the ac~ion of the biasing means and withou~ inter~upting the ro~ation o~ the drive member.
In one embodiment o~ ~he invention, the combined brake and clutch mechanism also includes means biasing the brake member to the second position and normally overpowering the clutch shoe biasing means.
Xn one embodiment of the invention, ~he brake member comprises a brake band extending around the clutch shoe and having one end thereof secured to a fixed anchor, and the opposite end thereof secured to a movable anchor which brake band is self-energizing upon initial contact with the clutch ~¢~
shoe when the di.rection of rotation of the clutch shoe in relation to the brake band is flom the movable anchor toward the fixed anchor.
Other features and advan~ages of ~he embodiments of the invention will become known by reference to the following general descrip~ion, claims, and appended dLawings.
THE DRAWINGS
Figure l is an elevational view of a lawn mower embodying various of the fea~ures of the invention.
Figure 2 is an enlarged view, partially schematic and partially in section, of a com~ined clutch and brake mechanism which can be incorporated in the lawn mower shown in Figure l.
Figure 3 is a sectional view taken generally along line 3-~ of Figure ~.
Before explaining the embodiments of the invention in detail, it is to be understood that the invention i8 not limi~ed in i~s application ~o the details of construction and the arrangement of the components set forth in ~he following description or illustrated in the drawings. The invention is capable of other embodiments and of being ~s-practiced and carr~ed out in various r.7ays. Also it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limi~ing GENERAL DESCRIPTION
Shown in ~he drawings is ~ lawn mower 11 including a blade housing 13 which can be supported for travel over the ground in ny SUlt ble way, as for instance, by being slung under a trac~or or 10 forming a part of a ridlng ~over. I~ the illustrated construction, the blade ~ousing 13 is supported by a plurality of wheels 15.
Rotatably supported by the blade housing 13 is a drive shaft or member 17 which can be driven 15 in various ways, as for instancP' by a rem~te engine.
In the illustrated construction, the drive shaft 17 constitutes the lower end portion of the crank shaft of an inte~nal combustion engine 19 mounted on the blade housing 13.
Located within the cutter blade housing 13 for-relative ro~ation coaxially with ~he drive shaft 17, i5 a cutter blade assembly or driven member 21 which includes a cutter blade 24 located within the blade housing 13 and which is connected ~5 to the drive shaft 17 by a com~ined clutch and brake mechanism 23.
More specifically, the illustrated combined clutch and brake mechanism ~3 includes a centrifugal clutch 2.5 including a clutch drum 27 and cormected hub 28 which are keyed to and extend fix.edly from the drive shaft 17.
Engagable with the clutch drum 27 are one or more clutch shoes 31 (two diame~rically oppositely located shoes in the disclosed construction) which clutch shoes 31 are part of the cutter blade assembly 21 and are carried by a hub 41 about pivots in the form of pins 129 for luov~ t of che 10 clutch shoes 31 to and :Erom a clu~c:h drum Pngacring position. Retainer rings 130 are snap fitted onto the pins 129 to prevent movement of the clutch ~hoe~
31 a~ially of the pins 129~
As already indicated, means are provided 15 for ro~atably mounting the cutter blade 24 (and connected parts~ within the blade housing 13 for coaxial rotation relative to the drive shaft 17.
In the illustrated construction, the hub 41 includes a ~ounterbore 43 which receives one race 45 of a bearing 47 having a second ra~e 49 engaged with a shoulder 51 on the hu~ 28. The bearing race 45 is retained wi~hin the hub 41 by a ret~in;n~ ring 53 while the bearing race 49 is retained on ~he shoulder 51 on the hub 28 by a washer 55 and a headed bolt and lockwasher 57 which is axially threaded into the drive shaft 17 after passing through the hub 28~ ~-Means are provided or biasing the clutch shoe~31 into engagement with the clutch drum 27 so as to effect D~
ro~ation oE the cutter blade 24 in respon~e to ro~ation oE the drive sh~:Et 17. In the illustra~ed construction, such means comprises a yair of springs 61 which, at one end, are engaged against the free end of the clutch shoes 31 and, at the other end, against abutments 132 on the hub 41.
Means in the ~orm of a brake mechanism 70 are provided :Eor braking the cutter blade 24 against rotation and for simultanesouly overpowering ~he clutch shoe biasing means so as ~o disengag~ the clutch shoes 31 from the clutch drum 27. In t~e illus~rated construction, such means co~prises respective brake elements 71 whi h are respectively fixed to each of the clutch shoes 31 and which are generally of "L" shape including one leg 73 secured to the a s s o ciated clutch - shoe 31 by one or more fasteners 75 and a second generally semi-cyclindrical leg or braking surface 77 which extends in generally parallel and radially ou t ward relation to the clutch drum 27. The means for bra~ing the cutter blade 24 also includes a brake band or member 79 which is movably carried, at one end thereof, on a fixed pivot 81 extending from the blade housing 1~ and which extends in generally encircling, radially outwardly adjacent relation to the braking legs 77.
The brake band 79 is movable between a first position spaced from the braking legs or braking surfaces 77 so as to permit unhindered rotation oE the cutter blade 24 and a second posi~ion engaging the braking legs or braking surfaces 77 so as to brake rotation of the cutter blad~ and to simul~arleou~l.y displace ~ne clutch shoes 31 radially inwardly against the action of the clutch shoe biasing means or springs 61 and ou~ of engagement wi~h the clutch drum 27.
~leans are provided for hiasing the brake ban~ 79 to the position braking rotation of ~he cutter blade 24 and displacing the clutch shoes 31 away rom the ~lutch drum 27. In the illustrated con~truction, such means comprises a helical spring 85 con~e~ted, at one end thereof, to an anchor 87 extendin~ from the blade housing 13 znd, at the other end thereof 9 to the other or ~ree end o~ the brake band 79.
The lawn mower lL also include~ means for steering thereof such as, for instance~ the handle bar of a riding mower. In the illustrated construction, such means includes a handle 91 extending upwardly and rearwardly from the blade housing 13.
Means are pro~ided for manually over-riding the -.brake band biasing means. In the illustrated construction, such means comprises a hand operated lever 93 which is movably mounted on the handle 91 and which includes a hand operated part 95 movable between a position adjacent to the handle 9L a~d a position spaced from the handle 91. The over-riding means also includes a linkage 97 connecting the lever 93 to the brak~
25 band 79 such that the sprirlg 8~ is al~o e~fective to locate the hand operated part 95 in the position spaced from the handle ~1. Thus, whenever the hand operated part 95 is not held by the operator against or adjacent to the handle gl, the co~.bined clutch and`brake mechanism ?3 will operate to dise[lgage the clutch 25 and brake rotation of the cutter blade 2~ notwithstanding engine rotation.
Furthermore the engine 19 can be starter without causing rotation of the cutter blade 24 when the hand operater le~er part 95 is located in the spaced position.
Various of the features o~ the invention are set forth in the following claims,
Claims (25)
1. A combined brake and clutch mechanism comprising a drive member mounted for rotation and including thereon a clutch drum, a driven member carried for rotation coaxially with and relative to said drive member, a clutch shoe pivotally connected to said driven member for common rotation therewith and for movement relative to a position of engagement with said clutch drum, biasing means for urging said clutch shoe toward said position of engagement, a brake surface on said clutch shoe in radially outward relation to said clutch drum, and a brake member movable between a first position wherein said brake member is spaced from said brake surface, and a second position wherein said brake member engages said brake surface to brake rotation of said driven member and to displace said clutch shoe from said position of engagement against the action of said biasing means.
2. A combined brake and clutch mechanism in accordance with Claim 1 and further including means biasing said brake member to said second position.
3. A combined brake and clutch mechanism in accordance with Claim 2 and further including manual means for overpowering said brake member biasing means so as to displace said brake member to said first position.
4. A combined brake and clutch mechanism in accordance with Claim 1 wherein said driven member is supported for rotation from said drive member.
5. A combined brake and clutch mechanism in accordance with Claim 1 wherein said driven member carries thereon an abutment and wherein said biasing means comprises a spring acting between said abutment and said clutch shoe.
6. A combined brake and clutch mechanism in accordance with Claim 1 wherein said clutch drum is located radially outwardly of said clutch shoe and extends in generally coaxial relation to the axis of drive shaft rotation and wherein said brake surface is in generally coaxial relation to said clutch drum.
7. A combined brake and clutch mechansim in accordance with Claim 1 wherein said brake surface constitutes one leg of an L shaped member including a second leg extending radially inwardly and fastened to said clutch shoe.
8. A combined brake and clutch mechansim comprising a drive member mounted for rotation and including thereon a clutch drum, a driven member carried for rotation coaxially with and relative to said drive member, a clutch shoe pivotally connected to said driven member for common rotation therewith and having a first surface movable relative to a position of engagement with said clutch drum, biasing means for urging said clutch shoe toward said position of engagement, a brake surface on said clutch shoe in generally radially spaced coplanar relation to said first surface and in radially outward relation to said clutch drum, a brake member movable between a first position wherein said brake member is spaced from said brake surface, and a second position wherein said brake member engages said brake surface to brake rotation of said driven member and to displace said clutch shoe from said position of engagement against the action of said biasing means, and means biasing said brake member to said second position and normally overpowering said clutch shoe biasing means.
9. A combined brake and clutch mechanism in accordance with Claim 8 and further including manual means for overpowering said brake member biasing means so as to displace said brake member to said first position.
10. A combined brake and clutch mechanism in accor-dance with claim 8 wherein said driven member is supported for rotation from said drive member.
11. A combined brake and clutch mechanism in accordan-ce with claim 8 wherein said driven member carries thereon an abutment and wherein said clutch shoe biasing means comprises a spring acting between said abutment and said clutch shoe.
12. A combined brake and clutch mechanism in accordan-ce with claim 8 wherein said clutch drum is located radially outwardly of said clutch shoe and extends in generally coaxial relation to the axis of drive shaft rotation and wherein said brake surface is located radially outwardly of and in generally coaxial relation to said clutch drum.
13. A combined brake and clutch mechanism in accordance with Claim 8 wherein said brake surface constitutes one leg of a L shaped member including a second leg extending radially inwardly and fastened to said clutch shoe.
14. A clutch mechanism comprising a rotatable drive member, a driven member, a drum carried on said drive member, a clutch shoe pivotally carried on said driven member for common rotation therewith and movable radially in a given plane normal to the axis of said drive member and relative to said driven member and into and out of a position of clutching engagement with said drum, means biasing said clutch shoe into said position of engagement with said drum to drivingly clutch together said drive and driven members, a brake surface on said clutch shoe in radially outward relation to said clutch drum, and a brake member movable between a first position wherein said brake member is spaced from said brake surface, and a second position wherein said brake member engages said brake surface to brake rotation of said driven member and to displace said clutch shoe from said position of engagement against the action of said biasing means and without interrupting the rotation of said drive member, said brake member being generally disposed in and acting in said given plane.
15. A clutch mechanism as set forth in Claim 14 wherein said brake member comprises a brake band extending around said clutch shoe and having one end thereof secured to a fixed anchor and the opposite end thereof secured to a movable anchor, said brake band being self energizing upon initial contact with said clutch shoe when the direction of rotation of said clutch shoe in relation to said brake band is from said movable anchor toward said fixed anchor.
16. A clutch mechanism in accordance with Claim 14 and further including means biasing said brake member to disengage said shoe from said drum and to stop said driven member, said brake member biasing means normally overpowering said clutch shoe biasing means.
17. A clutch mechanism in accordance with Claim 14 wherein said brake member comprises a brake band.
18. A clutch mechanism in accordance with Claim 14 wherein said clutch shoe biasing means is located in said given plane.
19. A clutch mechanism comprising rotatable drive and driven members, a drum carried on said drive member, a clutch shoe pivotally carried on said driven member for common rotation therewith and movable relative thereto and into and out of clutching engagement with said drum, said clutch shoe including a clutch surface engageable with said drum and a brake surface radially outwardly spaced from said clutch surface and in radially outward relation to said clutch drum, means for biasing said shoe into a position of engagement with said drum to drivingly clutch together said drive and driven members, and a brake member movable between a first position wherein said brake member is spaced from said brake surface, and a second position wherein said brake member engages said brake surface to brake rotation of said driven member and to displace said clutch shoe from said position of engagement against the action of said biasing means and without interrupting the rotation of said drive member.
20. A clutch mechanism in accordance with Claim 19 wherein said clutch and brake surfaces extend generally circumferentially of the axis of said drive member.
21. A clutch mechanism in accordance with claim 19 wherein said clutch surface engageable with said drum is located radially inwardly of said brake surface which is engageable by said brake means.
22. A clutch mechansim comprising a rotatable drive member, a driven member, a drum carried on said drive member, a clutch shoe pivotally carried on said driven member for common rotation therewith and for movement relative to said driven member and into and out of a position of clutching engagement with said drum, means biasing said shoe into said position of engagement with said drum to drivingly clutch together said drive and driven members, a brake surface on said clutch shoe in radially outward relation to said clutch drum, and a brake band movable between a first position wherein said brake band is spaced from said brake surface, and a second position wherein said brake band engages said brake surface to brake rotation of said driven member and to displace said clutch shoe from said position of engagement against the action of said biasing means and without interrupting the rotation of said drive member, said brake band extending around said clutch shoe and having one end thereof secured relative to a fixed anchor and the opposite end thereof secured to a movable anchor, said brake band being extended in one position of said movable anchor to avoid contact with said clutch shoe and thus provide for engagement between said shoe and said drum to drivingly clutch said drive and driven members together and being contracted in a second position of said movable anchor to move said clutch shoe inwardly against the force of said biasing means to thus effect disengagement between said shoe and said drum and to stop said driven member.
23. A clutch mechanism as set forth in claim 22 wherein said clutch shoe has a generally arcuate recess opening axially in the direction of said drum and receiving said drum, said recess having a radially outwardly facing surface for drivingly engaging said drum, said clutch shoe further having an outer arcuate surface engageable by said brake band.
24. A clutch mechanism as set forth in Claim 22 wherein said movable anchor is carried by a pivotally mounted lever movable between a brake band extending position and a brake band contracting position.
25. A clutch mechanism as set forth in claim 24 wherein said pivotally mounted lever is biased by spring means toward the brake band contracting position, and control means connected to said lever for selectively moving and holding said lever against the bias of said spring means in the brake band extending position, the biasing force of said spring means serving to return said lever to the brake band contracting position when said control means connected to said lever is selectively released.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US690,632 | 1976-05-27 | ||
| US05/690,632 US4044533A (en) | 1976-05-27 | 1976-05-27 | Lawn mower blade clutch and brake |
| CA000278286A CA1190160A (en) | 1976-05-27 | 1977-05-12 | Lawn mower blade clutch and brake |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000278286A Division CA1190160A (en) | 1976-05-27 | 1977-05-12 | Lawn mower blade clutch and brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1190161A true CA1190161A (en) | 1985-07-09 |
Family
ID=25668510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000443217A Expired CA1190161A (en) | 1976-05-27 | 1983-12-13 | Combined clutch and brake mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1190161A (en) |
-
1983
- 1983-12-13 CA CA000443217A patent/CA1190161A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |