Electrical contact pins for electrically coupling electronic devices, batteries, and/or battery chargers

1. An electrical contact pin, comprising:

an outer shaft;

an inner shaft at least partially received within the outer shaft and slidable relative to the outer shaft, the inner shaft defining a longitudinal axis; and

a rotatable member disposed at a free end of the inner shaft, the rotatable member configured to establish direct electrical communication with a corresponding contact, wherein the rotatable member is rotatable through 360 degrees relative to the inner shaft at least about an axis perpendicular to the longitudinal axis so as to reduce the application of oblique forces to the inner shaft.

2. The electrical contact pin according to claim 1 , further comprising a biasing member interdisposed between the inner shaft and the outer shaft, the biasing member configured to bias the inner and outer shafts apart from one another.

3. The electrical contact pin according to claim 1 , wherein the rotatable member includes a spherical member disposed at the free end of the inner shaft, the spherical member rotatable through 360 degrees relative to the inner shaft about a plurality of axes including the perpendicular axis.

4. The electrical contact pin according to claim 1 , wherein the rotatable member includes at least one wheel disposed at the free end of the inner shaft, the at least one wheel rotatable through 360 degrees relative to the inner shaft about the perpendicular axis.

5. A battery charging apparatus, including:

at least one charging bay, each charging bay configured to operably receive a battery assembly therein; and

at least one electrical contact pin disposed within each of the charging bays, the at least one electrical contact pin including:

an outer shaft;

an inner shaft at least partially received within the outer shaft and slidable relative to the outer shaft, the inner shaft defining a longitudinal axis; and

a rotatable member disposed at a free end of the inner shaft, the rotatable member configured to establish direct electrical communication with a corresponding contact, wherein the rotatable member is rotatable through 360 degrees relative to the inner shaft at least about an axis perpendicular to the longitudinal axis so as to reduce the application of oblique forces to the inner shaft.

6. The battery charging apparatus according to claim 5 , wherein the at least one electrical contact pin further comprises a biasing member interdisposed between the inner shaft and the outer shaft, the biasing member configured to bias the inner and outer shafts apart from one another.

7. The battery charging apparatus according to claim 5 , wherein the rotatable member of the at least one electrical contact pin includes a spherical member disposed at the free end of the inner shaft, the spherical member rotatable through 360 degrees relative to the inner shaft about a plurality of axes including the perpendicular axis.

8. The battery charging apparatus according to claim 5 , wherein the rotatable member of the at least one electrical contact pin includes at least one wheel disposed at the free end of the inner shaft, the at least one wheel rotatable through 360 degrees relative to the inner shaft about the perpendicular axis.

9. A system, comprising:

a battery assembly including at least one electrical contact; and

a device configured to operably couple to the battery assembly for charging the battery assembly or receiving power from the battery assembly, the device including at least one electrical contact pin configured to electrically coupled to the at least one electrical contact of the battery assembly, each electrical contact pin including:

an outer shaft;

an inner shaft at least partially received within the outer shaft and slidable relative to the outer shaft, the inner shaft defining a longitudinal axis; and

a rotatable member disposed at a free end of the inner shaft, the rotatable member configured to establish direct electrical communication with the at least one electrical contact, wherein the rotatable member is rotatable through 360 degrees relative to the inner shaft at least about an axis perpendicular to the longitudinal axis so as to reduce the application of oblique forces to the inner shaft.

10. The system according to claim 9 , wherein the at least one electrical contact pin further comprises a biasing member interdisposed between the inner shaft and the outer shaft, the biasing member configured to bias the inner and outer shafts apart from one another.

11. The system according to claim 9 , wherein the rotatable member of the at least one electrical contact pin includes a spherical member disposed at the free end of the inner shaft, the spherical member rotatable through 360 degrees relative to the inner shaft about a plurality of axes including the perpendicular axis.

12. The system according to claim 9 , wherein the rotatable member of the at least one electrical contact pin includes at least one wheel disposed at the free end of the inner shaft, the at least one wheel rotatable through 360 degrees relative to the inner shaft about the perpendicular axis.

13. The system according to claim 9 , wherein the device is a surgical instrument.

14. The system according to claim 9 , wherein the device is a battery charging apparatus.