The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 1989
Filed:
Jan. 06, 1989
Applicant:
Inventor:
James R Alexander, Plymouth, MI (US);
Assignee:
Other;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10C / ;
U.S. Cl.
CPC ...
84239 ;
Abstract
An improvement for grand piano actions reduces unwanted friction between the repetition lever and the hammer shank. The conventional grand piano knuckle is replaced by a lever disposed generally parallel to the repetition lever and pivotally secured thereto at one end. An adjustable spring provides a force biasing the lever away from the repetition lever. A travel limit adjusts the maximum pivotal excursion of the lever relative to the repetition lever. At the opposite end of the lever, a centrally pivoted platform structure is pivotally secured. The structure includes a surface which engages the hammer shank and at least one brake surface which engages the repetition lever.