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No 21 Backhead Detail (1806 words) |
 | It was mounted to the large hole in the bottom of the backhead in the previous photo. |
| The small dark spots between the hand holes are the stay bolts that hold the outer backhead to the inner ring seen in the previous photo. |
| It is possible that the hole cut in the front of the cab after outshopping was a shroud that covered the air intake reducing the possibility of fire in the cabin. |
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Patent 4402370: Valveless pneumatic hammer (3064 words) |
| There is a chamber divider at the backhead end of the casing which co-operates with the piston for conducting fluid under pressure into alternate chambers, one at each piston end, for reciprocation of the piston. |
| The backhead end of the chamber divider is adapted to co-operate with the inner end of the back-head assembly for the securing of the chamber divider between the screwed in backhead assembly, and the locating ring. |
| In use, air under pressure is admitted to the casing 1 by the backhead assembly 2 and passes along the first fluid path into the first fluid chamber 23 where the pressure causes the piston 13 to move towards the backhead assembly 2 and position two. |
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