Spreader mechanisms for supporting tripod legs
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0333111
(2001-07-16)
|
우선권정보 |
GB-200017410 (2000-07-14) |
국제출원번호 |
PCT/GB01/03179
(2001-07-16)
|
국제공개번호 |
WO02/06722
(2001-01-24)
|
발명자
/ 주소 |
- Lindsay, Richard Arthur
- Murrow, Andrew Derek
|
출원인 / 주소 |
|
대리인 / 주소 |
Moser, Patterson & Sheridan, L.L.P.
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
4 |
초록
▼
The disclosure relates to a spreader mechanism for supporting the legs ( 11 ) of a tripod erect, comprising a hub ( 13 ) having a central axis, three arms ( 14 ) pivotally mounted on the hub at positions equi-spaced around the hub to swing with respect to the hub axis between extended and folded pos
The disclosure relates to a spreader mechanism for supporting the legs ( 11 ) of a tripod erect, comprising a hub ( 13 ) having a central axis, three arms ( 14 ) pivotally mounted on the hub at positions equi-spaced around the hub to swing with respect to the hub axis between extended and folded positions. A drive mechanism ( 19, 22 ) coordinates movement of the arms so that all three arms remain in the same relationship to the hub axis throughout the range of movement of the arms, and a locking device ( 26, 29, 30, 31, 32 ) locks the drive mechanism against movement at any position throughout the range of movement of the arms. The locking device may be released held by a push button operated mechanism ( 50, 51, 36, 34 ) to allow adjustment of the spreader member and the holding means is deactivated to allow engagement of the locking device to lock the arms in a selected position of adjustment.
대표청구항
▼
1. A spreader mechanism for supporting the legs of a tripod erect, comprising a hub having a central axis, three arms pivotally mounted on the hub at positions equi-spaced around the hub to swing with respect to the hub axis between extended and folded positions, a drive mechanism coordinating movem
1. A spreader mechanism for supporting the legs of a tripod erect, comprising a hub having a central axis, three arms pivotally mounted on the hub at positions equi-spaced around the hub to swing with respect to the hub axis between extended and folded positions, a drive mechanism coordinating movement of the arms so that all three arms remain in the same relationship to the hub axis throughout the range of movement of the arms, a locking device for locking the drive mechanism against movement at any position throughout the range of movement of the arms, means to hold the locking device released to allow adjustment of the spreader member and means to deactivate the holding means to allow engagement of the locking device to lock the arms in a selected position of adjustment. 2. A spreader mechanism as claimed in claim 1 wherein the locking device includes a first annular member mounted for rotation in the hub about said central axis and drivably connected by said drive mechanism to said arms to be rotated by rotation of the arms and means for holding said member locked against rotation. 3. A spreader mechanism as claimed in claim 1, wherein the drive mechanism coordinating movement of the arms comprises a shaft mounted for linear movement along the hub axis and the locking device acts to lock the shaft against movement in the hub to lock the arms in a selected position. 4. A spreader mechanism as claimed in claim 3, wherein the drive connection between the arms and shaft comprise segmental gears on the arms and outwardly facing toothed racks on the shaft with which the gears are engageble whereby linear movement of the shaft causes rotary movement of the arms. 5. A spreader mechanism as claimed in claim 3, wherein the first rotatable annular member of the locking device encircles the shaft and is constrained against axial movement in the hub, the annular member being in driving engagement with the shaft whereby linear movement of the shaft causes rotary movement of the annular member and brake means are mounted for linear movement on the hub parallel to the hub axis to engage and release the annular member to lock and release the shaft. 6. A spreader mechanism as claimed in claim 2, wherein the drive mechanism between the arms and said first annular member comprises a helical gear on the annular member and part-helical gears on the arms meshing with the helical gear of the member. 7. A spreader mechanism as claimed in claim 2, wherein the means to engage and release the first annular member comprise a second annular member mounted in the hub for axial sliding movement with respect to the hub axis but constrained against rotation in the hub, spring means being provided acting between the hub and the second annular member biassing the second and first annular members together to lock the first member against rotation with respect to the second member, said holding means comprising means for disengaging the second member from the first member. 8. A spreader mechanism as claimed in claim 7, wherein the first and second annular members have serrations which interengage when the plates are together to lock the first plate against rotation with respect to the second plate. 9. A spreader mechanism as claimed in claim 7, wherein the holding means comprise a rotary collar mounted on the hub and means actuated by the collar for lifting the second member out of engagement with the first member. 10. A spreader mechanism as claimed in claim 7, wherein the hub includes a push button release for releasing the action of the holding means.
이 특허에 인용된 특허 (4)
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Kawazoe Michio (30-11 5-chome Narita Higashi ; Suginami-ku ; Tokyo JPX), Adapter for tripods.
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Nakatani Koichiro (Tokyo JPX), Center column friction control system for video tripod.
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Mooney Paul C. (c/o Quick Set ; Inc. ; 3650 Woodhead Dr. Northbrook IL 60062), Locking mechanism for tripod and spreader legs.
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Miyazaki Kiyoshi (Tokyo JPX), Photographic tripod apparatus.
이 특허를 인용한 특허 (7)
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Young, Nathan E.; Foster, Anthony A., Telescoping support stand apparatus.
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Young, Nathan E.; Foster, Anthony A., Telescoping support stand apparatus.
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Young, Nathan E.; Foster, Anthony A., Telescoping support stand apparatus.
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Young, Nathan E.; Foster, Anthony A., Telescoping support stand apparatus.
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Young, Nathan E.; Foster, Anthony A., Telescoping support stand apparatus.
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Young, Nathan E.; Foster, Anthony A., Telescoping support stand apparatus.
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Young, Nathan E.; Foster, Anthony A., Telescoping support stand apparatus.
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