Patent ID: 7938430

Claim:
An anti-sway device for coupling a tow vehicle to a trailer comprising; a) an elongate shank member for coupling to a trailer hitch receiver of a tow vehicle; b) a first pivot member attached to said shank member having two sets of coaxial first right and left pivot pins ( 122 , 126 and 120 , 124 ) c) two connecting links, one attaching pivotally at each end of said first pivot member upper and lower pivot pins; d) a second pivot member, coplanar to said first pivot member, having two sets of coaxial second right and left pivot pins ( 86 , 88 and 90 , 92 ) attached pivotally at each end to said connecting links where horizontal clearance exists between said right and left sets of pivot pins, and the horizontal distance between the pivot pins of said second pivot member is greater than the horizontal distance between the pivot pins of said first pivot member, providing for four linked pivotable joints, said four link pivotable joints providing for an effective pivot point substantially forward of said first pivot member when said tow vehicle and said trailer are oriented in a straight line, such that when said second pivot member is rotated about said first pivot member, one said set of pivot pins ( 120 , 124 or 122 , 126 ) of said first pivot member can pass in between the said sets of pivot pins ( 86 , 88 and 90 , 92 ) of said second pivot member, into said horizontal clearance of said second pivot member, without interference between said first and second pivot members and; e) mounting means on a second side of said second pivot member for a hitch ball, and a link; and f) link means for eliminating the rotation of the trailer tongue about a vertical axis relative to a hitch ball.