IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0922482
(2009-04-14)
|
등록번호 |
US-8459623
(2013-06-11)
|
우선권정보 |
SG-200803071-0 (2008-04-22) |
국제출원번호 |
PCT/US2009/040442
(2009-04-14)
|
§371/§102 date |
20100914
(20100914)
|
국제공개번호 |
WO2009/131869
(2009-10-29)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Instron Singapore Pte Ltd
|
대리인 / 주소 |
Lowe Hauptman Ham & Berner, LLP
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
5 |
초록
▼
A powered grip that can engage and hold an item which includes a primary body member, an actuator dependent from the primary body member and a pair of spaced apart clamp jaws to move towards and away from each other. A force transmission mechanism is operatively located intermediate of the actuator
A powered grip that can engage and hold an item which includes a primary body member, an actuator dependent from the primary body member and a pair of spaced apart clamp jaws to move towards and away from each other. A force transmission mechanism is operatively located intermediate of the actuator and each of the clamp jaws to displace the clamp jaws relative to the primary body and that, through mechanical advantage, establishes a multiplication of the force of the actuator force at the clamp jaws. A force transmission mechanism geometry adjuster is provided to vary the spacing between the clamp jaws for any given operating force applied by the actuator, allow the pre-testing setting of the spacing between the jaws such that the range of force applied by the clamping jaws to the item to be tested is within a desired range.
대표청구항
▼
1. A powered grip for engaging and holding an item, said grip comprising: a primary body member,an actuator dependent from said primary body member,a pair of spaced apart clamp jaws movable towards and away from each other and configured to clamp onto said item,a force transmission mechanism couplin
1. A powered grip for engaging and holding an item, said grip comprising: a primary body member,an actuator dependent from said primary body member,a pair of spaced apart clamp jaws movable towards and away from each other and configured to clamp onto said item,a force transmission mechanism coupling said actuator and said pair of clamp jaws to displace said clamp jaws relative the primary body and to establish, at the clamp jaws, a clamp force which is a multiplication of an actuator force of the actuator by a factor greater than zero,a force transmission mechanism geometry adjuster configured to adjust a geometry of the force transmission mechanism in order to vary a spacing between the clamp jaws to thereby, for a given actuator force applied by the actuator to the force transmission mechanism, allow a pre-clamping setting of the spacing between the jaws such that a range of the clamp force applied by the clamp jaws to the item to be clamped is within a desired range,wherein said force transmission mechanism includes at least one pivot point that remains fixed to said primary body member, and said force transmission mechanism is rotatable about the at least one pivot point in a manner to establish said multiplication of the actuator force at the clamp jaws. 2. The power grip as claimed in claim 1, wherein said actuator is one selected from the group consisting of (a) a piston and cylinder arrangement that is coupled to the transmission mechanism and displacement of the piston within the cylinder is effected by a fluid and (b) an electromechanical arrangement. 3. The power grip as claimed in claim 1, wherein said force transmission mechanism comprises, for each clamp jaw, a lever member pivotally mounted relative the primary body member and coupled to said clamp jaw, the lever member rotatable about a pivot in response to the actuator force to move said clamp jaw relative the other clamp jaw. 4. The power grip as claimed in claim 3, wherein said force transmission mechanism, for each clamp jaw, further comprises a link beam that couples the lever member with said actuator, said link beam coupled to said lever member to apply a moment to said lever member to cause the lever member to rotate about the pivot of the lever member, thereby transferring the moment by said lever member and as the clamp force to the clamp jaw. 5. The power grip as claimed in claim 4, wherein said force transmission mechanism further comprises, for each clamp jaw, a jaw mount, and for at least one of said clamp jaws, the jaw mount is configured to transfer the clamp force to the clamp jaw. 6. The power grip as claimed in claim 1, wherein said force transmission mechanism, for each clamp jaw, further comprises a jaw mount. 7. The power grip as claimed in claim 5, wherein the jaw mount is coupled to the lever member and the corresponding clamp jaw. 8. The power grip as claimed in claim 7, wherein said jaw mount is pivotally coupled to said lever member. 9. The power grip as claimed in claim 8, wherein said link beam and said jaw mount are pivotally coupled to said lever member on opposite sides of the pivot. 10. The power grip as claimed in claim 4, wherein said link beam is pivotally connected to said actuator and said lever member. 11. The power grip as claimed in claim 5, wherein said force transmission mechanism geometry adjuster is defined by said jaw mount that is adjustably mounted to said lever member in order to allow the spacing between the clamp jaws to be varied, without movement of the lever member. 12. The power grip as claimed in claim 5, wherein said force transmission mechanism geometry adjuster is defined by said jaw mount that is adjustable in size in order to allow the spacing between the clamp jaws to be varied, without movement of the lever member. 13. The power grip as claimed in claim 12, wherein said jaw mount comprises a first portion that remains secured to said lever member and a second position, held by said first portion in a movable relationship thereto. 14. The power grip as claimed in claim 13, wherein said first portion and said second portion are threadingly engaged with each other, such that upon relative rotation, a linear displacement between the two portions occurs to vary the spacing between the clamp jaws. 15. The power grip as claimed in claim 1, wherein said force transmission mechanism geometry adjuster is configured to allow, for different spacings of clamp jaws at initial contact with the item to be clamped, the setting of the geometry of the force transmission mechanism in a condition so that, for a given actuator force of the actuator, the clamp force remains within the desired range. 16. The power grip as claimed in claim 1, wherein the grip is adapted to be used for materials testing. 17. The power grip as claimed in claim 1, where the force transmission mechanism is arranged to provide a mechanical advantage. 18. The power grip as claimed in claim 1, wherein said factor is greater than 1. 19. A powered grip for engaging and holding an item, said grip comprising: a primary body member,an actuator dependent from said primary body member,a pair of spaced apart clamp jaws mounted from said primary body member in a manner to allow a distance between the clamp jaws to vary and each of the pair of clamp jaws being configured to clamp onto said item,a force transmission mechanism coupling said actuator and at least one of the clamp jaws of said pair of clamp jaws to displace said at least one clamp jaw relative the primary body to vary the distance between said clamp jaws and to establish, at the clamp jaws, a clamp force which is a multiplication of an actuator force of the actuator by a factor greater than zero,a force transmission mechanism geometry adjuster configured to adjust a geometry of the force transmission mechanism in order to vary the distance between the clamp jaws to thereby, for a given actuator force applied by the actuator to the force transmission mechanism, allow a pre-clamping setting of the distance between the jaws such that a range of the clamp force applied to the item to be clamped between the clamp jaws is within a desired range,wherein said force transmission mechanism includes at least one pivot point that remains fixed to said primary body member, and said force transmission mechanism is rotatable about the at least one pivot point in a manner to establish said multiplication of the actuator force at the clamp jaws. 20. The power grip as claimed in claim 19, wherein said force transmission mechanism comprises, for said at least one clamp jaw, a lever member pivotally mounted relative the primary body and coupled to said at least one clamp jaw, the lever member rotatable about a pivot in response to the actuator force to move said clamp jaw relative the other said clamp jaw. 21. The power grip as claimed in claim 19, wherein said force transmission mechanism further comprises a link beam that couples the lever member with said actuator, said link beam coupled to said lever member to apply a moment to said lever member to cause the lever member to rotate about the pivot of the lever member, thereby transferring the moment by said lever member and as the clamp force to the clamp jaw. 22. The power grip as claimed in claim 19, wherein said force transmission mechanism geometry adjuster further comprises a jaw mount which is configured to transfer the clamp force to the at least one clamp jaw. 23. The power grip as claimed in claim 22, wherein said force transmission mechanism comprises, for said at least one clamp jaw, a lever member pivotally mounted relative the primary body, and said force transmission mechanism geometry adjuster comprises said jaw mount that is adjustably mounted to said lever member in order to allow the distance between the clamp jaws to be varied, without movement of the lever member. 24. The power grip as claimed in claim 22, wherein said force transmission mechanism geometry adjuster comprises said jaw mount that is adjustable in size in order to allow the distance between the clamp jaws to be varied, without movement of the lever member. 25. The power grip as claimed in claim 19, wherein the force transmission mechanism further comprises a combination of lever members mechanically linked to couple with said actuator, said combination of lever members configured to apply a moment to at least one of the lever members to cause the at least one of the lever members to rotate about the pivot of one of the lever members, thereby transferring the moment by said at least one of the lever members and as the clamp force to the clamp jaw. 26. The power grip as claimed in claim 19, wherein the grip is adapted to be used in materials testing. 27. The power grip as claimed in claim 25, wherein said combination of lever members comprises a first lever member, a first end of which is coupled to the actuator,a second lever member, a first end of which is joined to a second end of the first lever member,a third lever member having a first end pivotally coupled to the second lever member, a fourth lever member having a first end pivotally coupled to the primary body member for allowing the combination of lever members to apply a moment to the fourth lever member to cause the fourth lever member to rotate about said first end of the fourth lever member, and the third lever member having a second end joined to a midpoint of the fourth lever member,wherein when the actuator actuates, the combination of lever members applies the moment as the clamp force to the clamp jaw. 28. The power grip as claimed in claim 27, wherein the first and second lever members are rigidly connected to each other. 29. The power grip as claimed in claim 28, wherein the first end of the second lever member member is coupled to the primary body member via a hinge joint. 30. The power grip as claimed in claim 29, wherein the second lever member is not in contact with the fourth lever member. 31. A powered grip for engaging and holding an item to be clamped, said grip comprising: a primary body member,an actuator dependent from said primary body member,a pair of spaced apart clamp jaw mounts, each of the clamp jaw mounts for receiving a clamp jaw being movable towards and away from each other and configured to allow the clamp jaws, when mounted, to clamp onto said item,a force transmission mechanism coupling said actuator and the clamp jaw mounts to establish, at the clamp jaws, a clamp force which is a multiplication of an actuator force of the actuator by a factor greater than zero,a force transmission mechanism geometry adjuster configured to adjust a geometry of the force transmission mechanism independently of movement of the force transmission mechanism in order to vary a spacing between the clamp jaw mounts to thereby, for a given actuator force applied by the actuator to the force transmission mechanism, allow a pre-clamping setting of the spacing between the jaws such that a range of the clamp force applied by the clamp jaws to the item to be clamped is within a desired range. 32. A method of clamping an item by utilising the power grip as claimed in claim 1, comprising setting the clamp jaws a determined distance apart before actuating the actuator to move the clamp jaws towards each other. 33. The method as claimed in claim 32, wherein the determined distance sets a free stroke of the clamp jaws and the force transmission mechanism, and sets the geometry of the force transmission mechanism upon initial clamping of the item. 34. A powered grip for holding an item to be tensile tested, said item is susceptible to a size reduction when under tension at a location where the item is to held by the powered grip, said grip comprising: a primary body member,an actuator dependent from said primary body member,a pair of spaced apart clamp jaws movable towards and away from each other and configured to clamp onto said item,a force transmission mechanism coupling said actuator and said pair of clamp jaws to displace said clamp jaws relative the primary body member and to establish, at the clamp jaws, a clamp force which is a multiplication of an actuator force of the actuator by a factor greater than zero,a force transmission mechanism geometry adjuster configured to adjust a geometry of the force transmission mechanism independently of movement of the force transmission mechanism in order to vary the spacing between the clamp jaws to thereby, for a given applied by the actuator to the force transmission mechanism, allow a pre-clamping setting of the spacing between the jaws such that a range of the clamp force applied by the clamp jaws to the item to be clamped is within a desired range so that when the item, under tensile loading, decreases in size at the clamp jaws, the clamp jaws move to compensate for the size reduction and by virtue of the change in the geometry of the force transmission mechanism, increase the clamp force.
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