Interlocking fan guard
Patent 4861230 Issued on August 29, 1989. Estimated Expiration Date: 
February 17, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 17, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1114459 2656974 2658666 3446429 3787142 3791333 Portable air circulating fan Patent #: 3963382 InventorAssigneeApplicationNo. 07/311755 filed on 02/17/1989US Classes:416/247RPROTECTIVE SCREEN OR GUARDExaminersPrimary: Joyce, HaroldAttorney, Agent or FirmInternational ClassesF04D 29/00 (20060101)F04D 29/70 (20060101) AbstractA fan guard comprising front and rear portions each including a plurality of radially extending wires circumferentially spaced supporting a plurality of concentrically mounted wire rings. Some of the radially extending wires include an end having a homogeneously extending tab formed thereon. The tabs have a front and back side and are formed by bending the end of the wires into a P-shaped loop defining a slot having parallel edges. The tabs are offset with respect to the portion's joining plane so when the guard portions are assembled the front side of the tabs of the front portion engage the back side of the tabs of the rear portion to form abutments with each other in an interlocked relation preventing axial separation of the guard portions and the loops align to receive a bolt upon which a nut is threaded to secure the guard portions together. | |
