Patent ID: 7270345
Filing Date: 2007-09-18
Classification: B60S,Y10T

Abstract:
1. A swivel jack assembly for dispersing a load, the swivel jack assembly comprising: a mounting bracket affixed to an elongated tubular housing of a jack; a first plate secured to the mounting bracket, the first plate having a first inner portion and a first outer portion in the same vertical plane, and having a first aperture in the center of the first inner portion and a shallow groove forming a narrow circular ring centered around the first aperture, separating the first inner portion and the first outer portion, wherein the shallow groove is no deeper than the thickness of the first plate; a second plate secured to a trailer tongue, the second plate having a second inner portion and a second outer portion in the same vertical plane, and having a second aperture in the center of the second inner portion and a plurality of protrusions forming a discontinuous narrow circular ring centered around the second aperture, separating the second inner portion and the second outer portion, wherein the height of the protrusions are adapted to matingly engage the shallow groove of the first plate while the first inner portion of the first plate is in planar contact with the second inner portion of the second plate and the first outer portion of the first plate is in planar contact with the second outer portion of the second plate; a bolt passing horizontally through the first aperture in the first plate and the second aperture in the second plate, securing the first plate to the second plate, and adapted so that when the shallow groove of the first plate accepts the plurality of protrusions of the second plate and a load is applied to the swivel jack, the shallow groove bears a load at an upper arc of contact between the shallow groove and the plurality of protrusions above the bolt, and the shallow groove bearing a load at a lower arc of contact between the shallow groove and the plurality of protrusions below the bolt; and a releasable latch for securing the jack in either an upright position or a towed position, the releasable latch comprising a pin securing the first plate to the second plate, wherein the load is distributed between the upper arc of contact and the lower arc of contact.