Spring Fulcrum Patents (Class 84/227)
  • Patent number: 8143505
    Abstract: A lever 40 is supported by a lever supporting portion 41. Through a first pivoting member 52, the lever 40 is urged by a reaction force stabilization spring 54, a first spring 55 and a second spring 56. The downward displacement of a second pivoting member 53 is restricted by a fixed supporting member FR. If the urging force of the first spring 55 exceeds the urging force of the second spring 56, the second pivoting member 53 is displaced upward. A contact member which is in contact with the first pivoting member 52 and the second pivoting member 53 to produce friction force is also provided.
    Type: Grant
    Filed: January 11, 2010
    Date of Patent: March 27, 2012
    Assignee: Yamaha Corporation
    Inventor: Shigeru Muramatsu
  • Patent number: 5747711
    Abstract: A clear stringed musical instrument body capable of receiving a substance such that the appearance of the instrument may be altered by changing the substance contained within the body. The body comprises a front, a back and sides defining a watertight interior. The front includes at least one opening into watertight means for housing electronic control components within the body, wherein the watertight means projects into the interior of the body and merges with the body. The body also includes means for filling and draining the body which comprises at least one hole formed on the body and a plug received within the hole. The body further includes means for attaching the body to a neck and means for attaching a strap to the body.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: May 5, 1998
    Inventors: Jack D. Cavaness, Deanne E. Cavaness
  • Patent number: 4278004
    Abstract: Each key of the pedalboard is supported and guided for pivotal movement in a vertical plane by a steel strip secured to the underside of each key adjacent the midportion thereof. The rear end of each key is operatively connected to a transversely extending rear frame for horizontal reciprocating movement perpendicular to the rear frame and the forward end of each key is disposed between transversely extending upper and lower and front frame members for limited vertical movement therebetween. The forward end of each steel strip is secured to the lower front frame member to normally bias the forward end of each key into engagement with the upper front frame member.
    Type: Grant
    Filed: January 22, 1980
    Date of Patent: July 14, 1981
    Inventor: Paul A. Klann
  • Patent number: 4019418
    Abstract: A stop tablet mechanism particularly suited for electric organs wherein a plurality of stop tablets lie in closely spaced apart side-by-side relation, the stop tablets being pivotally mounted in a supporting frame by means of locating ears which are maintained in positive pivotal contact with the frame by pairs of wire springs, the wire springs engaging cam defining laterally projecting shoulders on the tablets and performing the additional function of maintaining the tablets in either of two positions of use, the spring elements being configured to provide flexibly mounted detent points which coact with the noses of the cam surfaces to maintain the tablet in its desired position of use.
    Type: Grant
    Filed: April 1, 1976
    Date of Patent: April 26, 1977
    Assignee: D. H. Baldwin Company
    Inventors: Thomas E. Kimble, Marion B. Gregory