US3939730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Housing for motorcycle drive chain
Assignee: Individual
•
Filing: 1974-10-08
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Granted: 1976-02-24
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Expires: 1994-10-08
Abstract
Abstract A self-contained housing for the drive chain of a conventional chain-driven motorcycle comprising a front section, enclosing the motorcycle drive sprocket and a portion of the drive chain, and a rear section, enclosing the rear wheel sprocket and the remaining portion of the chain, both sections being joined together by a flexible coupling to form a single, integrated unit. Sealing interfaces are provided where the housing mates with the motorcycle transmission case and the rear wheel hub to prevent contaminants from entering the housing and also to prevent leakage of a pool of lubricating oil that is maintained within the housing to continuously lubricate the drive chain and sprocket. The forward end of the housing is reinforced to prevent the chain from flying loose and causing injury to the motorcycle operator or damage to the engine casing should the chain break while it is in motion.
Inventors
- 👤 Robert D. DeHaan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:21
CPC Classifications
B; B62; B62J; B62J13/00; B62J13/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A chain housing, adapted for mounting on a conventional chain-driven motorcycle to enclose the drive sprocket, drive chain and rear wheel sprocket thereof, comprising: a. a front housing section enclosing a drive sprocket and a portion of a drive chain; b. a rear housing section enclosing a rear wheel sprocket and the remaining portion of said drive chain; c. means for flexibly coupling said front housing section to said rear housing section; d. means for removably attaching said rear housing section to a frame member of a motorcycle; e. a cup-shaped gland member removably attached to the rear wheel hub of said motorcycle; and f. an annular lip seal removably attached to said rear housing section and sealingly engaging said gland member.
Claim 2
Dependent Claim
122 words
A chain housing, adapted for mounting on a conventional chain-driven motorcycle to enclose the drive sprocket, drive chain and rear wheel sprocket thereof, comprising: a. a front housing section enclosing a drive sprocket and a portion of a drive chain; b. a rear housing section enclosing a rear wheel sprocket and the remaining portion of said drive chain; c. means for flexibly coupling said front housing section to said rear housing section; d. means for removably attaching said rear housing section to a frame member of a motorcycle; e. a cup-shaped gland member removably attached to the rear wheel hub of said motorcycle; and f. an annular lip seal removably attached to said rear housing section and sealingly engaging said gland member.
Claim 3
Dependent Claim
19 words
The chain housing of claim 1 wherein said coupling means comprises a plurality of short lengths of flexible hose.
Claim 4
Dependent Claim
23 words
The chain housing of claim 1 further comprising means for removably attaching said front housing section to the transmission casing of a motorcycle.
Claim 5
Dependent Claim
26 words
The chain housing of claim 3 further comprising means for forming an oil-, moisture- and dirt-proof seal between said front housing section and said transmission casing.
Claim 6
Dependent Claim
36 words
The chain housing of claim 1 wherein said front housing section further comprises a reinforcing member forming the forward wall of said front housing section and having means for engaging a frame member of a motorcycle.
Claim 7
Dependent Claim
29 words
The chain housing of claim 1 further comprising means for maintaining a lubricating oil bath within said housing in which a portion of said drive chain is continually immersed.
Claim 8
Dependent Claim
77 words
The chain housing of claim 6 wherein said means for maintaining said oil bath comprises: a. means defining an oil filler port formed in one side of said housing at a position corresponding to the desired level of said oil bath; b. means defining an oil drain port formed in the lowermost part of said housing; c. means for opening and closing said oil filler port; and d. means for opening and closing said oil drain port.
Claim 9
Dependent Claim
357 words
A chain housing, adapted for mounting on a conventional chain-driven motorcycle to enclose the drive sprocket, drive chain and rear wheel sprocket thereof, comprising: a. a C-shaped front housing section of substantially rectangular cross-section for enclosing the drive sprocket and a portion of the drive chain of a motorcycle, said front housing section having a reinforced forward wall, means for engaging a frame member of said motorcycle, means for removable attachment to the transmission casing of said motorcycle, and two rearward facing orifices of substantially rectangular cross-section for receiving said drive chain of said motorcycle; b. a reverse C-shaped rear housing section of substantially rectangular cross-section for enclosing the rear wheel sprocket and the remaining portion of the drive chain of said motorcycle, said rear housing section having means for removable attachment to a frame member of said motorcycle and two forward facing orifices of substantially rectangular cross-section for receiving said drive chain of said motorcycle; c. means for flexibly connecting said front housing section to said rear housing section such that, when connected, said front and rear housing sections define a hollow elongated toroid of substantially rectangular cross-section; d. means defining a first aperture in one side of said front housing section for receiving the drive shaft of said motorcycle; e. means for forming an oil-, moisture- and dirtproof seal between said front housing section and the transmission casing of said motorcycle around said drive shaft; f. means defining a second aperture in the opposite side of said front housing section for receiving the drive sprocket of said motorcycle; g. means for sealingly covering said second aperture in said front housing section; h. means defining a first aperture in one side of said rear housing section for receiving the rear wheel sprocket of said motorcycle; i. a cup-shaped gland member removably attached to the rear wheel hub of said motorcycle; j. an annular lip seal removably attached to said rear housing section around said first aperture and sealingly engaging said gland member; and k. means defining a second aperture in the opposite side of said rear housing section for receiving the rear axle of said motorcycle.
Claim 10
Dependent Claim
357 words
A chain housing, adapted for mounting on a conventional chain-driven motorcycle to enclose the drive sprocket, drive chain and rear wheel sprocket thereof, comprising: a. a C-shaped front housing section of substantially rectangular cross-section for enclosing the drive sprocket and a portion of the drive chain of a motorcycle, said front housing section having a reinforced forward wall, means for engaging a frame member of said motorcycle, means for removable attachment to the transmission casing of said motorcycle, and two rearward facing orifices of substantially rectangular cross-section for receiving said drive chain of said motorcycle; b. a reverse C-shaped rear housing section of substantially rectangular cross-section for enclosing the rear wheel sprocket and the remaining portion of the drive chain of said motorcycle, said rear housing section having means for removable attachment to a frame member of said motorcycle and two forward facing orifices of substantially rectangular cross-section for receiving said drive chain of said motorcycle; c. means for flexibly connecting said front housing section to said rear housing section such that, when connected, said front and rear housing sections define a hollow elongated toroid of substantially rectangular cross-section; d. means defining a first aperture in one side of said front housing section for receiving the drive shaft of said motorcycle; e. means for forming an oil-, moisture- and dirtproof seal between said front housing section and the transmission casing of said motorcycle around said drive shaft; f. means defining a second aperture in the opposite side of said front housing section for receiving the drive sprocket of said motorcycle; g. means for sealingly covering said second aperture in said front housing section; h. means defining a first aperture in one side of said rear housing section for receiving the rear wheel sprocket of said motorcycle; i. a cup-shaped gland member removably attached to the rear wheel hub of said motorcycle; j. an annular lip seal removably attached to said rear housing section around said first aperture and sealingly engaging said gland member; and k. means defining a second aperture in the opposite side of said rear housing section for receiving the rear axle of said motorcycle.
Claim 11
Dependent Claim
29 words
The chain housing of claim 8 further comprising means for maintaining a lubricating oil bath within said housing in which a portion of said drive chain is continually immersed.
Claim 12
Dependent Claim
77 words
The chain housing of claim 9 wherein said means for maintaining said oil bath comprises: a. means defining an oil filler port formed in one side of said housing at a position corresponding to the desired level of said oil bath; b. means defining an oil drain port formed in the lowermost part of said housing; c. means for opening and closing said oil filler port; and d. means for opening and closing said oil drain port.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |