Means for controlling the displacement of a universally pivoted member

A device for indicating at least one of two wind characteristics, namely, wind speed and wind direction and comprising:

• a measuring unit having an elongated universally pivoted member comprising a rod, a counterweight supported by a first end of the rod and an elongate member supported by a second end of the rod, the elongate member being adapted to be exposed to the wind;
• a display unit having an elongated universally pivoted member which serves as an index, and a scale of at least one of wind direction and wind speed;
• a plurality of transmitting bellows coupled to said universally pivoted member of the measuring unit in different angular positions, an equal number of slave bellows coupled to said index at similar angular positions and pipe means connecting each transmitting bellows to a slave bellows so that distortion of said transmitting bellows caused by angular movement of the universally pivoted member of said measuring unit when the elongate member thereof is acted upon by a wind load causes distortion of said slave bellows to effect displacement of the index relative to the scale;
• and wherein each of said measuring unit and said display unit includes an annular member of flexible and resilient material having an outer periphery and an inner periphery and constituting a universal pivot for said universally pivoted member, with said first and second ends of said universally pivoted member being on opposite sides of said pivot;
• a tension member;
• means coupling a first end of said tension member to the first end of said universally pivoted member;
• an anchorage means for the second end of said tension member holding said second end of said tension member against movement about said universal pivot, said second end of said tension member being more remote from said universal pivot member than the first end thereof, resilient means exerting a tension force on said tension member;
• adjustment means connected to said anchorage means for adjusting the force exerted by said tension member on said universally pivoted member;
• means for temporarily holding said universally pivoted member of said measuring unit in a central position;
• a fixed mounting for said annular member;
• and means locating the outer periphery of said annular member with respect to said fixed mounting, with said inner periphery of said annular member engaging said universally pivoted member;
• the arrangement being such that the universal pivot and the first and second ends of said tension member are in a straight line when the universally pivoted member is in a central position and angular movement of said universally pivoted member in any direction from said central position due to a wind load upon said elongate member of the universally pivoted member of the measuring unit stresses said resilient member to provide a first restoring force and distorts said annular member to thereby create a second restoring force which together with said first restoring force acts on said universally pivoted member to tend to restore it to its central position.