Apparatus for adjusting the leverage of an oar or scull while rowing
OwnerCarel J. Rijndersinventor
Life of this patent
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Abstract
An oar or scull is equipped with a movable sliding bushing or collar (2, 3) for adjusting the leverage while rowing. For this purpose a locking device (12) normally prevents the linear or axial movement of the oar shaft with a sliding sleeve (8) which is mounted on the oar shaft (1) relative to the locking device. By pushing a button (11) on the handle (10), the locking device (12) will allow a relative movement of approximately 2.5 mm at a time between the collar (3A, 3B) and the shaft (1). Releasing the button (11) allows again a movement of 2.5 mm, whereby a rower is able to adjust the leverage and thus the load while rowing.
Claims20
An apparatus for adjusting a leverage of an oar, comprising an oar shaft (1) having a handle at one end and an oar blade at the other end, first means (2, 3) for defining an engagement area where said oar shaft (1) engages an oarlock, second means (8) for slidingly mounting said first means on said oar shaft, whereby relative longitudinal movement is possible between said first means (2, 3) and said oar shaft (1), third means (7) rigidly secured to said oar shaft for applying an adjustment force between said first means and said third means, biasing means (5) interposed between said first and third means for exerting said adjustment force at least in one longitudinal axial direction, locking means (12) for locking said first means (2) and said third means (7) relative to each other at any axial spacing (S) of a plurality of axial spacings from each other, and operating means (9, 11) operable by a rower with one hand while continuing rowing with said one hand for releasing said locking means to permit a change in said spacing, whereby said leverage is adjustable while rowing.
An apparatus for adjusting a leverage of an oar, comprising an oar shaft (1) with a handle (10) at one end and with an oar blade (22) at the other end, an oarlock engaging member (2, 3) slideably mounted on said oar shaft (1) to permit an axial movement of said oar shaft relative to said oarlock engaging member (2, 3), locking means (12) operatively interposed between said oarlock engaging member and said oar shaft for normally preventing said axial movement, and manually operable release means connected to said locking means for temporarily releasing said locking means with one hand from said handle (10) for permitting said axial movement while continuing rowing with said one hand.
Dependencies are inferred from the claim text.