When he eventually released his grip Jacobs pushed his mother to the floor and hit her.
Judge Tony Couch said Jacobs had a "very disconcerting history for violence", with 11 assault-related convictions.
It was "significant" that he punched his mother when she was "particularly vulnerable", having just tried to strangle her.
Judge Couch said Jacobs had admitted the charges but the pleas came only on the day he had been set to defend the charges at a hearing.
He sentenced Jacobs to nine months on the assault with intent charge, with a nine-month sentence for the assaulting female charge to run concurrently, and an extra two months cumulatively for the breach of a protection order.
Jacobs was given an extra one month each on the other charges to run concurrently.
However, given the fact that Jacobs had been in custody since December 13, the judge said that time served would be taken into consideration, meaning he would probably be eligible for release "relatively soon".
- Greymouth Star