Whenever any member of a regularly constituted police force in the city becomes physically disabled to such an extent as to necessitate the suspending of performance of his duty on such police force, or retirement from the police force, he shall be paid from the fund a pension of one-half (1/2) of the salary attached to the rank he held on the police force for one year immediately prior to the time of his so suspending performance of his duty or retirement. Whenever such disability ceases and the policeman resumes the performance of his duty on the police force such pension shall cease.
If the disability continues for a period of time which, if added to the period of his active service equals twenty (20) years, the policeman shall, if he is then of the age of fifty (50) years, if he elects to then retire from said police force, be paid a regular pension in lieu of such disability pension. (R.O. 1959, Ch. 32, Sec. 5)