Patent US3944005A successfully refreshed from Google Patents.
US3944005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension device for vehicles
Assignee: Yamaha Motor Co Ltd
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Filing: 1974-12-26
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Granted: 1976-03-16
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Expires: 1994-12-26
Abstract
Abstract A suspension device for motor driven vehicles such as snowmobiles comprises a pair of slide rails which are resiliently suspended under the vehicle body to ensure engagement of the ground-engaging portion of a flexible endless track with the ground, the endless track being driven by a drive sprocket wheel journalled on the front portion of the vehicle body and stretched at its rear portion over rear idler wheels journalled on the rear portions of the slide rails. The resiliency of the suspension device is adjusted to prevent skidding of the rear portion of the endless track.
Inventors
- 👤 Fujihiko Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:14
CPC Classifications
B; B62; B62M; B62M27/00; B62M27/02; B62M2027/026
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
256 words
A suspension device for a motor driven snow vehicle having a flexible endless track driven by the power taken from the engine of the vehicle by way of a drive sprocket wheel journalled on the front portion of the vehicle body comprising: slide rail means arranged longitudinally inside said endless track for holding engagement of the ground-engaging portion of said endless track with the ground and journalling rear idler wheels for said endless track at the rear end thereof, front supporting means journalled at the front portion thereof on the vehicle body and having a swingable connection at the rear portion thereof with an intermediate portion of said slide rail means to suspend said slide rail means under the vehicle body, said front supporting means having a rear extension projecting rearwardly of the axis of said swingable connection of the rear portion, rear supporting means having a journal connection on the vehicle body at the upper portion thereof and swingably connected at the lower portion thereof with the rear portion of said slide rail means to hold the rear portion of said slide rail means, said rear supporting means having a front extension projecting forwardly of the axis of said journal connection, and resilient means connected at the upper and lower ends thereof with said front and rear extensions respectively for biasing said slide rail means downwardly toward the ground by way of said front and rear supporting means to suspend said endless track and for preventing skidding of the rear portion of said endless track.
Claim 2
Dependent Claim
256 words
A suspension device for a motor driven snow vehicle having a flexible endless track driven by the power taken from the engine of the vehicle by way of a drive sprocket wheel journalled on the front portion of the vehicle body comprising: slide rail means arranged longitudinally inside said endless track for holding engagement of the ground-engaging portion of said endless track with the ground and journalling rear idler wheels for said endless track at the rear end thereof, front supporting means journalled at the front portion thereof on the vehicle body and having a swingable connection at the rear portion thereof with an intermediate portion of said slide rail means to suspend said slide rail means under the vehicle body, said front supporting means having a rear extension projecting rearwardly of the axis of said swingable connection of the rear portion, rear supporting means having a journal connection on the vehicle body at the upper portion thereof and swingably connected at the lower portion thereof with the rear portion of said slide rail means to hold the rear portion of said slide rail means, said rear supporting means having a front extension projecting forwardly of the axis of said journal connection, and resilient means connected at the upper and lower ends thereof with said front and rear extensions respectively for biasing said slide rail means downwardly toward the ground by way of said front and rear supporting means to suspend said endless track and for preventing skidding of the rear portion of said endless track.
Claim 3
Dependent Claim
34 words
A suspension device for a motor driven snow vehicle as claimed in claim 1, wherein said resilient means is adjustably connected at its lower end to the rear extension of said front supporting means.
Claim 4
Dependent Claim
78 words
A suspension device for a motor driven snow vehicle as claimed in claim 1, wherein the connection between the lower end of said resilient means and the rear extension of said front supporting means is adjustable along the longitudinal direction of said slide rail means to adjust the biasing force toward said slide rail means whereby the adjustment of the biasing force of said resilient means acts to prevent skidding of the rear portion of said endless track.
Claim 5
Dependent Claim
78 words
A suspension device for a motor driven snow vehicle as claimed in claim 1, wherein the connection between the upper end of said resilient means and the front extension of said rear supporting means is adjustable along the longitudinal direction of said slide rail means to adjust the biasing force toward said slide rail means whereby the adjustment of the biasing force of said resilient means acts to prevent skidding of the rear portion of said endless track.
Claim 6
Dependent Claim
115 words
A suspension device for a motor driven snow vehicle as claimed in claim 1, wherein said resilient means comprises a pair of coiled springs interposed between the rear extension of said front supporting means and the front extension of said rear supporting means and wherein the connections of said respective coiled springs with the rear extension of said front supporting means and the front extension of said rear supporting means are adjustable along the longitudinal direction of said slide rail means respectively to adjust the biasing force toward said slide rail means, whereby the adjustment of the biasing force of said coiled springs acts to prevent skidding of the rear portion of said endless track.
Claim 7
Dependent Claim
43 words
A suspension device for a motor driven snow vehicle as claimed in claim 1, wherein said resilient means comprises at least one coiled spring interposed between the rear extension of said front supporting means and the front extension of said rear supporting means.
Claim 8
Dependent Claim
25 words
A suspension device for a motor driven snow vehicle as claimed in claim 6, wherein said coiled spring is assembled together with an oil damper.
Claim 9
Dependent Claim
58 words
A suspension device for a motor driven snow vehicle as claimed in claim 1, wherein said slide rail means comprises at least one slide rail member extending longitudinally inside said endless track, said slide rail member being swingably connected at its substantial central portion with said front supporting means and journalling at its rear portion said idler wheels.
Claim 10
Dependent Claim
68 words
A suspension device for a motor driven snow vehicle as claimed in claim 1, wherein said slide rail means comprises a pair of slide rail members swingably connected at their susbtantial central portions with said front supporting means and wherein said resilient means comprises a pair of resilient elements interposed between the rear extension of said front supporting means and the front extension of said rear supporting means.
Claim 11
Dependent Claim
45 words
A suspension device for a motor driven snow vehicle as claimed in claim 9, wherein the connections between the rear extension of said front supporting means and said respective resilient elements are adjustable in the forward and rearward directions along said respective slide rail members.
Claim 12
Dependent Claim
45 words
A suspension device for a motor driven snow vehicle as claimed in claim 10, wherein the connections between the front extension of said rear supporting means and said respective resilient elements are adjustable in the forward and rearward directions along said respective slide rail members.
Claim 13
Dependent Claim
64 words
A suspension device for a motor driven snow vehicle as claimed in claim 9, wherein said front supporting means comprises a pair of front arms swingably connected with the substantial central portions of said slide rail members respectively and journalled at their front ends on the vehicle body, said resilient elements being connected respectively with a pair of rear extensions of said front arms.
Claim 14
Dependent Claim
54 words
A suspension device for a motor driven snow vehicle as claimed in claim 12, wherein said rear supporting means comprises a pair of rear arms journalled on the vehicle body at the upper portions thereof and swingably telescopically connected at the lower ends thereof to the rear portions of said slide rail members respectively.
Claim 15
Dependent Claim
44 words
A suspension device for a motor driven snow vehicle as claimed in claim 13, wherein said resilient elements are composed of a pair of shock absorbers interposed between the rear extensions of said front arms and the front extensions of said rear arms respectively.
References Cited (Backward Citations)
US3719242A
Cited
US3727709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |