Putter-type golf club head with alignment feature

1. A putter-type golf club head that, when oriented in a reference position, comprises:

a blade portion comprising a striking face, a top line, and a sole, the striking face including a face center;

a rear portion in communication with, and rearward of, the blade portion and having a rear portion top surface;

a projection extending upwardly from the rear portion top surface, the projection having a projection top surface, a heel-ward side surface, a toe-ward side surface, and a rear surface, the projection top surface comprising a generally planar surface;

a sightline formed in the projection top surface, the sightline comprising a groove at least partially filled with a filler material having a visually contrasting appearance to portions of the top surface surrounding the groove, the groove defining a virtual center line segment oriented in a substantially front-to-rear direction at a substantially constant height from a lowermost point of the sole between 1.6 mm and 26 mm and wherein the rear portion further comprises a heel arm rearwardly extending from the blade portion at a heel-ward location, and a toe arm rearwardly extending from the blade portion at a toe-ward location, and a strut rearwardly spaced from the projection and extending in the heel-to-toe direction between the heel arm and the toe arm.

2. The putter-type golf club head of claim 1 , wherein the rear surface of the projection is angled relative to a ground plane such that the rear surface extends forward in a downward direction.

3. The putter-type golf club head of claim 1 , wherein the filler material comprises white-colored paint.

4. The putter-type golf club head of claim 1 , wherein the sightline is not spaced more than 10 mm from a virtual vertical plane passing through the face center and extending generally perpendicular to the striking face.

5. The golf club head of claim 1 , wherein the height of the virtual center line segment is between 21 mm and 22 mm.

6. A putter-type golf club head that, when oriented in a reference position, comprises:

a blade portion comprising a striking face, a top line, and a sole, the striking face including a face center;

a rear portion in communication with, and rearward of, the blade portion, the rear portion comprising a heel arm rearwardly extending from the blade portion at a heel-ward location and a toe arm rearwardly extending from the blade portion at a toe-ward location, the rear portion including a rear portion top surface;

a projection extending upwardly from the rear portion top surface, the projection having a projection top surface, a projection heel-ward side surface, a projection toe-ward side surface, and a projection rear surface;

an alignment element formed in the projection top surface, the alignment element defining a virtual center line segment oriented in a substantially front-to-rear direction at a substantially constant height H1 from a lowermost point of the sole between 16 mm and 26 mm; and

a strut rearwardly spaced from the projection and extending in the heel-to-toe direction between the heel arm and the toe arm.

7. The putter-type golf club head of claim 6 , wherein the strut comprises a length between 30 mm and 40 mm.

8. The golf club head of claim 7 , wherein the height of the virtual center line segment is substantially equal to 21.3 mm.

9. The putter-type golf club head of claim 6 , wherein the strut comprises a width between 8 mm and 20 mm.

10. The putter-type golf club head of claim 6 , wherein the strut comprises a height H2 between 16 mm and 24 mm.

11. The putter-type golf club head of claim 6 , wherein the strut comprises a height H2 such that: 0.75≤H2/H1≤1.0.

12. The golf club head of claim 6 , wherein the height of the virtual center line segment is between 21 mm and 22 mm.

13. A putter-type golf club head that, when oriented in a reference position, comprises:

a blade portion comprising a striking face, a top line, and a sole, the striking face including a face center;

a rear portion in communication with, and rearward of, the blade portion, the rear portion including a rear portion top surface;

a projection extending upwardly from the rear portion top surface, the projection having a projection top surface, a projection heel-ward side surface, a projection toe-ward side surface, and a projection rear surface, the projection rear surface being angled relative to a ground plane such that the rear surface extends forward in a downward direction; and

an alignment element formed in the projection top surface, the alignment element defining a virtual center line segment oriented in a substantially front-to-rear direction at a substantially constant height H1 from a lowermost point of the sole between 16 mm and 26 mm.

14. The putter-type golf club head of claim 13 , wherein the projection rear surface forms an angle θ relative to the ground plane of no less than 5°.

15. The putter-type golf club head of claim 14 , wherein the angle θ is between 20° and 40°.

16. The putter-type golf club head of claim 13 , wherein the rear portion further comprises a heel arm rearwardly extending from the blade portion at a heel-ward location, and a toe arm rearwardly extending from the blade portion at a toe-ward location.

17. The putter-type golf club head of claim 16 , further comprising a strut rearwardly spaced from the projection and extending in the heel-to-toe direction between the heel arm and the toe arm.

18. The golf club head of claim 13 , wherein the height of the virtual center line segment is between 21 mm and 22 mm.