Double reduction gear drive means

Details Double reduction gear drive means Double reduction gear drive means

2001-01-25

2002-06-04

Dickson, Paul N. (Department: 3613)

Machine element or mechanism

Mechanical movements

Reciprocating or oscillating to or from alternating rotary

C074S425000, C074S42100R, C074S089140

Reexamination Certificate

active

06397691

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention deals with the field of devices for controlling boat lift apparatus. Boat lift apparatus is used normally adjacent large bodies of water for removing a boat or other watercraft from the water to an elevated position for storage. This is normally controlled by a cable mechanism attached to the boat lift apparatus.
This boat lift cable must be accurately controlled for movement and the present invention provides a double reduction gear drive for powering movement of such boat lifting cables which is significantly improved since it utilizes direct engagement of gearing rather than chains or pulleys or other remote means for connecting rotating shafts. Also the mutual orientation of the axis of the input shaft, the internal shaft, the output shaft and the winding spool provide a distinct improvement over the prior art since lubrication is significantly enhanced and smaller sized designs can be utilized. The maintenance requirements for chain and belt drive systems is problematic in the relatively harsh environments that are normally experienced at the locations where such boat lifts are utilized. For this reason the use of a direct drive double reduction gear mechanism is a significant enhancement over the prior art.
2. Description of the Prior Art
Various prior art devices have been utilized for the purposes of controlling movement of boat lifting mechanisms such as shown in U.S. Pat. No. 3,191,389 patented Jun. 29, 1965 to J. B. Poe on a “Boat Lift”; and U.S. Pat. No. 3,265,024 patented Aug. 9, 1966 to C. W. Kramlich on a “Boat Lift”; and U.S. Pat. No. 3,504,502 patented Apr. 7, 1970 to L. H. Blount on a “Lift Dock For A Water Borne Vessel”; and U.S. Pat. No. 3,675,258 patented Jul. 11, 1972 to Bradley M. Osmundson on a “Boat Hoist”; and U.S. Pat. No. 3,778,855 patented Dec. 18, 1973 to Nikolai Kariagin et al and assigned to Whittaker Corporation on a “Telescopic Gravity Davit”; and U.S. Pat. No. 3,791,229 patented Feb. 12, 1974 to Heinz Litezki and assigned to Schiess Aktiengesellschaft on a “Lifting Device For Lifting And Lowering Heavy Loads”; and U.S. Pat. No. 4,337,868 patented Jul. 6, 1982 to Narahari Gattu and assigned to Harnischfeger Corporation on a “Telescopic Crane Boom Having Rotatable Extend/Retract Screws”; and U.S. Pat. No. 4,589,800 patented May 20, 1986 to Charles L. Nasby, Jr. on a “Dock Structure And Method And Apparatus For Raising And Lowering Same”; and U.S. Pat. No. 4,641,996 patented Feb. 10, 1987 to Morton Seal on a “Side Loading Boat Lifts”; and U.S. Pat. No. 4,686,920 patented Aug. 18, 1987 to James L. Thomas on a “Cradle Type Boat Lifts”; and U.S. Pat. No. 4,954,011 patented Sep. 4, 1990 to Samuel H. Stenson on a “Powered Method And Apparatus For Lifting A Boat”; and U.S. Pat. No. 4,983,067 patented Jan. 8, 1991 to David M. Montgomery on a “Boat Lift Apparatus”; and U.S. Pat. No. 5,020,463 patented Jun. 4, 1991 to Robert E. Franklin et al on an “Arrangement For Raising Or Lowering Boats Or The Like”; and U.S. Pat. No. 5,051,027 patented Sep. 24, 1991 to George F. Horton on a “Boat Lift”; and U.S. Pat. No. 5,090,842 patented Feb. 25, 1992 to David M. Montgomery on a “Boat Lift Apparatus And System”; and U.S. Pat. No. 5,140,923 patented Aug. 25, 1992 to Kevin L. Wood on a “Raising And Lowering Device”; and U.S. Pat. No. 5,211,124 patented May 18, 1993 to John N. Reiser and assigned to Triton Corporation on a “Winch Construction For Boat Lift”; and U.S. Pat. No. 5,261,347 patented Nov. 16, 1993 to Peter W. Mansfield on a “Sailboat Davit”; and U.S. Pat. No. 5,287,821 patented Feb. 22, 1994 to Byron L. Godbersen on an “Electric Drive Mechanism For Boat Hoist Winch”; and U.S. Pat. No. 5,390,616 patented Feb. 21, 1995 to Henry Roth on a “Dock Mounted Small Boat Lifting System”; and U.S. Pat. No. 5,593,247 patented Jan. 14, 1997 to James A. Endres et al and assigned to Endcor Inc. on a “Programmable Boat Lift Control System”; and U.S. Pat. No. 5,687,663 patented Nov. 18, 1997 to Noel D. Wahlstrand on a “Boat Lift Transport Apparatus”; and U.S. Pat. No. 5,701,834 patented to Richard A. Lyons on Dec. 30, 1997 on a “Lift For Watercraft”; and U.S. Pat. No. 5,755,529 patented May 26, 1998 to R. R. Brad Follett on a “Boat Lift”; and U.S. Pat. No. 5,769,568 patented Jun. 23, 1998 to David G. Parkins et al and assigned to ABL Boat Lifts on an “Adaptable Boat Lift”; and U.S. Pat. No. 5,772,360 patented Jun. 30, 1998 to Donald M. Wood, II on a “Topless Watercraft Lifting Apparatus With A Differential Gearing System”; and U.S. Pat. No. 5,803,003 patented Sep. 8, 1998 to Robert V. Vickers and assigned to The Louis Berkman Company on a “Rotary Boat Lift”; and U.S. Pat. No. 5,915,877 patented to Charles L. Sargent et al on Jun. 29, 1999 and assigned to Quality Boat Lift, Inc. on a “Positive Drive Boat Lift”; and U.S. Pat. No. 5,934,826 patented Aug. 10, 1999 to Peter W. Mansfield on a “Boat Lift Apparatus”; and U.S. Pat. No. 5,947,639 patented Sep. 7, 1999 to Richard B. Bishop et al on a “Boat Lift Apparatus”; and U.S. Pat. No. 5,957,623 patented to Charles L. Sargent et al on Sep. 28, 1999 and assigned to Quality Boat Lifts Inc. on an “Electrically Insulated Positive Drive Boat Lift”; and U.S. Pat. No. 5,988,941 patented Nov. 23, 1999 to Charles L. Sargent et al and assigned to Quality Boat Lifts, Inc. on a “Boat Lift Cable Lock Apparatus”; and U.S. Pat. No. 6,006,687 patented Dec. 28, 1999 to Jeffrey M. Hillman et al and assigned to Marine Floats, Inc. on a “Modular Floating Boat Lift”; and U.S. Pat. No. 6,033,148 patented Mar. 7, 2000 to Lynn P. Norfolk et al and assigned to Norfolk Fabrication, Inc. on a “Housing For A Boat Lift Motor, Pulley And Gear Drive”; and U.S. Pat. No. 6,122,692 patented Feb. 8, 2000 to Lynn P. Norfolk et al and assigned to Norfolk Fabrication, Inc. on a “Housing For A Boat Lift Motor Pulley And Gear Drive” and U.S. Pat. No. 6,122,994 patented Sep. 26, 2000 to Lynn P. Norfolk et al and assigned to Norfolk Fabrication, Inc. on a “Housing For A Boat Lift Motor, Pulley And Gear Drive”; and United States Design Patent No. Des. 390,188 patented Feb. 3, 1998 to Lynn P. Norfolk et al and assigned to Norfolk Fabrication, Inc. on a “Boat Lift Motor And Gear Housing”.
SUMMARY OF THE INVENTION
The present invention provides a double reduction gear drive device for powering movement of a boat lifting cable which includes a main housing defining a main housing chamber therein. The main housing also preferably defines an input aperture and an output aperture therein both in fluid flow communication with respect to the main housing chamber.
An input shaft is also included rotatably mounted with_respect to the main housing and extending through the input aperture into the main housing chamber. A primary input shaft bearing is also included mounted in the main housing immediately adjacent the input aperture. This primary input shaft bearing is adapted to receive the input shaft extending therethrough to facilitate rotational movement thereof relative to the main housing.
A secondary input shaft bearing may also be included mounted in the housing spatially disposed from the primary input shaft bearing and adapted to receive the input shaft therethrough in order_to facilitate rotational movement thereof relative to the main housing.
An input gear is also preferably included secured to the input shaft at a position within the main housing chamber. An internal shaft is rotatably movably mounted within the main housing chamber of the main housing in a position extending approximately parallel to the input shaft and slightly displaced laterally therefrom. This input shaft and the internal shaft are both oriented in a generally vertically plane parallel with respect to one another.
A main internal gear may be also included secured on the internal shaft to be rotatable therewith. This main internal gear is preferably in engagement with respect to the input gear in such a manner as to be rotatably driven responsive to rotation of the input gear. The main internal gear is preferably larger than

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