IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0615848
(1975-09-23)
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발명자
/ 주소 |
- Kuzarov Encho Janaki (Milwaukie OR)
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| 출원인 / 주소 |
- Warn Industries, Inc. (Kent WA 02)
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| 인용정보 |
피인용 횟수 :
48 인용 특허 :
0 |
초록
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A winch having a clutch-brake assembly comprising a ratchet plate with a constantly engaged pawl, and two clutch shoes. With a tension load on the cable of the drum, two rotatably mounted cam members engage each other to move the clutch shoes into engagement with the ratchet plate to cause power to
A winch having a clutch-brake assembly comprising a ratchet plate with a constantly engaged pawl, and two clutch shoes. With a tension load on the cable of the drum, two rotatably mounted cam members engage each other to move the clutch shoes into engagement with the ratchet plate to cause power to be transmitted to the drum of the winch. Under minimal or no external load, after the power source has been operated shortly in reverse, a spring maintains the clutch shoes out of engagement to permit the cable on the drum to be reeled out freely at a moderate rate of acceleration.
대표청구항
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In a winch comprising: a. a drum adapted to have a cable wound thereon, b. a first power transmitting means operatively connected to said drum, c. a driven cam member having an axially facing cam surface and having an operative connection to said first power transmitting means, said cam being rotata
In a winch comprising: a. a drum adapted to have a cable wound thereon, b. a first power transmitting means operatively connected to said drum, c. a driven cam member having an axially facing cam surface and having an operative connection to said first power transmitting means, said cam being rotatable in a first direction to cause said drum to turn so as to reel in cable, and rotatable in a second direction to cause said drum to pay out cable, d. a rotatably mounted second driving cam member having an axially facing second cam surfaCe to engage said first cam surface, said second cam member being rotatable in a first direction to engage said first cam member in wedging engagement to urge said first and second cam members axially away from each other and to tend to drive said cam member in its first direction to reel in cable, and rotatable in a second direction to move away from wedging engagement to permit said first cam member to rotate in its second direction to pay out cable, e. second power transmitting means to transmit power from a power source to said second drive cam, f. a brake-clutch assembly comprising: 1. a rotatably mounted ratchet plate, 2. a first shoe mounted on one side of the ratchet plate and connected to the first driven cam so as to rotate therewith, 3. a second shoe mounted on the other side of the ratchet plate and connected to the second cam member so as to rotate therewith, g. said first and second shoes being connected to said first and second cam members to be movable toward each other and into frictional engagement with said ratchet plate by movement of the first and second cam members axially away from each other, and movable away from each other and out of frictional engagement with the ratchet plate by movement of the first and second cam members axially toward each other, whereby wedging engagement of the two cam members tends to move the shoes into engagement, and movement of the cam members out of wedging engagement permits the shoes to move up out of engagement, h. said winch being characterized in that: 1. when the winch is rotating in a direction to pay out cable at a constant speed by virtue of an exterior force acting on said drum, there are internal drag forces on the second drive cam including the drag of the second power transmitting means, the second shoe and the second cam member, which drag results in a first axially directed force component being created between the two cam members to urge said cam members away from each other and urge the shoes into engagement, 2. said winch has a practical minimum and maximum operating range with regard to the magnitude of torque loads against which the drum acts, and with the winch reeling in or paying out cable at the practical minimum operating limit, the torque load on the drum, acting back through the driven cam, produces a second axially directed force component tending to move the cams away from each other to cause the shoes to engage, 3. with the shoes disengaged, and with a tension load being applied to the cable so that cable is paying out at an accelerating rate of speed, there is practical upper limit to the level of acceleration of rotational speed of the winch drum, and at such level of acceleration, the frictional drag forces that act on the second drive cam and inertial forces of those components which act on the second drive cam, including the second shoe, the second power transmitting means and the second drive cam itself, are additive, this resulting in a third axially directed force component tending to move the two cams away from each other and cause the shoes to be engaged, 4. said winch being so constructed that the first force component is less than the second force component or the third force component, the improvement comprising: a. constantly engaged pawl means which engage said ratchet plate in a manner that under all operating conditions of the winch, said ratchet plate is permitted to rotate only in a direction to reel in cable, and b. biasing means to exert a fourth axially directed force component to urge said shoes out of engagement and urge said cam members axially toward each other, said biasing means being such that said fourth force component is greater than said first force component but less than said second or third force component, whereby: 1. with the winch operating under power to reel in cable, as in lifting a load, the shoes are engaged with the ratchet plate, so that when power is turned off, the clutch-brake assembly functions as a brake to stop cable from paying out under the force of the external load, 2. with the winch operating under power to pay out cable as in lowering a load, the shoes are in engagement with the ratchet plate, so that sliding engagement occurs with the clutch-brake assembly acting as a speed governor to prevent the drum from overrunning the power source, 3. with cable being pulled off the drum at a moderate rate of acceleration, the shoes remain disengaged to permit the paying out of cable with the ratchet plate remaining stationary, and 4. in a situation where cable is paying out at an excessive rate of acceleration, the shoes engage the stationary ratchet plate to act as a brake and stop further paying out of cable.
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