Augmented hydraulic thumb kinematic member length
An implement system for a machine having a stick member with a nose end and a mounting bracket is disclosed. The implement system includes a thumb pivotally connected to the nose end of the stick member, and a thumb actuator operatively connected between the mounting bracket of the stick member and the thumb to move the thumb between a fully retracted position and a fully extended position. The implement system has one or more of an RTK Factor, a TP Ratio and an ITO Ratio having values within ranges that allow installation of the implement system with the thumb actuator connected the thumb either directly or by a linkage assembly without changing the position of the mounting bracket on the stick member.
1. An implement system for a machine having a stick member with a nose end and a mounting bracket, the implement system comprising:
a thumb pivotally connected to the nose end of the stick member by a nose pin having a nose pin central axis; and
a thumb actuator operatively connected between the mounting bracket of the stick member and the thumb to move the thumb between a fully retracted position and a fully extended position, wherein a first end of the thumb actuator is pivotally connected to the mounting bracket by a bracket pin having a bracket pin central axis and a second end of the thumb actuator is pivotally connected to the thumb by a thumb power pin having a thumb power pin central axis, and wherein the implement system has a Retracted Thumb Kinematic (RTK) Factor defined as follows:
RTK
Factor
=
B
2.2
B
T
*
P
where B is a bracket positioning length from the nose pin central axis to the bracket pin central axis, BT is a thumb power pin length from the bracket pin central axis to the thumb power pin central axis when the thumb is in the fully retracted position, and P is a thumb moment arm length from the nose pin central axis to the thumb power pin central axis, with the RTK Factor having a value within a range having a lower limit of approximately 24.0 and an upper limit of approximately 28.0.
2. The implement system of claim 1 , wherein the RTK Factor has a value within a range having a lower limit of approximately 24.3 and an upper limit of approximately 25.8.
3. The implement system of claim 1 , comprising:
a first link having a first end pivotally connected to the stick member and second end; and
a second link having a first end pivotally connected to the thumb and a second end pivotally connected to the second end of the first link,
wherein the second end of the thumb actuator is pivotally coupled to the first link.
4. The implement system of claim 1 , wherein the implement system has a Thumb Performance (TP) Ratio defined as follows:
TP
Ratio
=
BT
P
with the TP Ratio having a value greater than 3.0.
5. The implement system of claim 4 , wherein the TP Ratio has a value within a range having a lower limit of approximately 3.3 and an upper limit of approximately 3.6.
6. The implement system of claim 1 , wherein the implement system has an Installed Thumb Optimization (ITO) Ratio defined as follows:
ITO
Ratio
=
B
T
B
with the ITO Ratio having a value greater than 0.78.
7. The implement system of claim 6 , wherein the ITO Ratio has a value within a range having a lower limit of approximately 0.79 and an upper limit of approximately 0.81.
8. An implement system for a machine having a stick member with a nose end and a mounting bracket, the implement system comprising:
a thumb pivotally connected to the nose end of the stick member by a nose pin having a nose pin central axis; and
a thumb actuator operatively connected between the mounting bracket of the stick member and the thumb to move the thumb between a fully retracted position and a fully extended position, wherein a first end of the thumb actuator is pivotally connected to the mounting bracket by a bracket pin having a bracket pin central axis and a second end of the thumb actuator is pivotally connected to the thumb by a thumb power pin having a thumb power pin central axis, and wherein the implement system has a Thumb Performance (TP) Ratio defined as follows:
TP
Ratio
=
BT
P
where BT is a thumb power pin length from the bracket pin central axis to the thumb power pin central axis when the thumb is in the fully retracted position, and P is a thumb moment arm length from the nose pin central axis to the thumb power pin central axis, with the TP Ratio having a value greater than 3.0.
9. The implement system of claim 8 , wherein the TP Ratio has a value within a range having a lower limit of approximately 3.3 and an upper limit of approximately 3.6.
10. The implement system of claim 8 , comprising:
a first link having a first end pivotally connected to the stick member and second end; and
a second link having a first end pivotally connected to the thumb and a second end pivotally connected to the second end of the first link,
wherein the second end of the thumb actuator is pivotally coupled to the first link.
11. The implement system of claim 8 , wherein the implement system has an Installed Thumb Optimization (ITO) Ratio defined as follows:
ITO
Ratio
=
B
T
B
where B is a bracket positioning length from the nose pin central axis to the bracket pin central axis, with the ITO Ratio having a value greater than 0.78.
12. The implement system of claim 11 , wherein the ITO Ratio has a value within a range having a lower limit of approximately 0.79 and an upper limit of approximately 0.81.
13. The implement system of claim 11 , wherein the implement system has a Retracted Thumb Kinematic (RTK) Factor defined as follows:
RTK
Factor
=
B
2.2
B
T
*
P
with the RTK Factor having a value within a range having a lower limit of approximately 24.0 and an upper limit of approximately 28.0.
14. The implement system of claim 13 , wherein the RTK Factor has a value within a range having a lower limit of approximately 24.3 and an upper limit of approximately 25.8.
15. An implement system for a machine having a stick member with a nose end and a mounting bracket, the implement system comprising:
a thumb pivotally connected to the nose end of the stick member by a nose pin having a nose pin central axis; and
a thumb actuator operatively connected between the mounting bracket of the stick member and the thumb to move the thumb between a fully retracted position and a fully extended position, wherein a first end of the thumb actuator is pivotally connected to the mounting bracket by a bracket pin having a bracket pin central axis and a second end of the thumb actuator is pivotally connected to the thumb by a thumb power pin having a thumb power pin central axis, and wherein the implement system has an Installed Thumb Optimization (ITO) Ratio defined as follows:
ITO
Ratio
=
B
T
B
where BT is a thumb power pin length from the bracket pin central axis to the thumb power pin central axis when the thumb is in the fully retracted position, and B is a bracket positioning length from the nose pin central axis to the bracket pin central axis, with the ITO Ratio having a value greater than 0.78.
16. The implement system of claim 15 , wherein the ITO Ratio has a value within a range having a lower limit of approximately 0.79 and an upper limit of approximately 0.81.
17. The implement system of claim 15 , comprising:
a first link having a first end pivotally connected to the stick member and second end; and
a second link having a first end pivotally connected to the thumb and a second end pivotally connected to the second end of the first link,
wherein the second end of the thumb actuator is pivotally coupled to the first link.