Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 4291665 | Propulsion device for spherical objects having an oscillating support frame providing a programmed discharge of said objects A propulsion device, designed especially but not necessarily solely for propelling tennis balls for training purposes, has in common with earlier devices a rotary distributor or magazine, feeding balls in successively following order into a discharge cond... | 09/29/1981 |
| 4233953 | Propulsion device for tennis balls and like spherical objects having an improved programmed discharge of the oscillatory type A device for propelling tennis balls has an oscillating discharge barrel to which balls are fed from a rotating distributor. A programmed relationship is provided, including a motion-translating linkage oscillating the barrel as an extension of the mechan... | 11/18/1980 |
| 4173903 | Crank drive for a photographic camera The invention relates to a crank drive, particularly to a crank drive for photographic cameras having a crank including a crankpin, and a drawbar pivotable about the crankpin. The drawbar consists of first and second rods connected to one another, and dis... | 11/13/1979 |
| 4130025 | Control linkage for converting alternating rotary motion into unidirectional motion A linkage assembly coupled between a pedal, rotatable from a neutral position in either of two directions, and a transmission and a carburetor or fuel injector. The linkage assembly includes a crank rotatable in either of two directions in response to the... | 12/19/1978 |
| 4109539 | Dynamic power booster The dynamic power booster is an apparatus which utilizes rotational input power for driving a crank lever in circular rotation. The crank lever drives a pivotally mounted lever assembly, having a first and a second lever slidably connected with one anothe... | 08/29/1978 |
| 3961856 | Soil compacting machine A machine for compacting soil includes a plurality of compacting elements or hammers elevated and lowered by means of a rotary shaft having an arm member for each hammer extending through aligned hammer openings, each arm member being mounted on the shaft... | 06/08/1976 |
