US3763715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary tightener for fan belts on automobile engines
Assignee: Individual
•
Filing: 1972-03-30
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Granted: 1973-10-09
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Expires: 1992-03-30
Abstract
Abstract An auxiliary tightener for fan belts on automobile engines consists of an idler pulley on a movable mounting bracket located in the normal path of a fan belt on an automobile engine so as to relocate the path of the fan belt and thus enable the regular adjustable tensioning device to be effective in maintaining working tension on said belt. In some automobile engines having overhead cam shafts milling the head to increase the compression ratio in the engine results in lowering the cam shaft to a position where the usual fan belt which drives the cam shaft, is incapable of maintaining proper frictional engagement with the drive pulleys of the engine. On such engines the use of the auxiliary tightener enables the cam shaft to be properly driven and the timing of the engine to be set as desired.
Inventors
- 👤 R Donnan
- 👤 M Pollard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:31
CPC Classifications
F; F16; F16H; F16H7/00; F16H7/08; F16H7/10; F16H7/12; F16H7/1254; F16H7/1263; F16H2007/0802; F16H2007/0806; F16H2007/0863; F16H2007/0874
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
287 words
Adjustment means for adjusting the tension in a flexible drive means interconnecting a crank shaft and an overhead cam shaft Of an overhead cam internal combustion engine to impart rotary motion of the crankshaft to the camshaft, comprising an engine block, a head on the engine block, a crankshaft in a lower portion of the engine block, a pulley on a forward end portion of said crankshaft at the forward end of the engine, a camshaft in the head of the engine, a pulley at the forward end portion of said camshaft at the forward end of the engine, a flexible drive means trained over the pulleys and connecting the pulleys together for imparting rotary motion of the crankshaft to the camshaft, a first bracket secured to the forward end of the engine block to one side of a straight line extended between the axes of the said pulleys, an idler pulley mounted on said bracket and engaged with an outer portion of the flexible drive means to take up slack in the flexible drive means resulting from normal wear, a second bracket secured to a forward end portion of said head of said engine near said pulley on said camshaft and on the opposite side of the line extended between the axes of the pulleys, an adjustment pulley mounted on said second bracket and engaged with said flexible drive means at an inner portion thereof, and adjustment means connected with said adjustment pulley to adjust the position of the adjustment pulley relative to the flexible drive means independently of adjustment of the idler pulley to compensate for changes in the distance between the crankshaft and camshaft resulting, for example, from milling the head of the engine.
Claim 2
Dependent Claim
287 words
Adjustment means for adjusting the tension in a flexible drive means interconnecting a crank shaft and an overhead cam shaft Of an overhead cam internal combustion engine to impart rotary motion of the crankshaft to the camshaft, comprising an engine block, a head on the engine block, a crankshaft in a lower portion of the engine block, a pulley on a forward end portion of said crankshaft at the forward end of the engine, a camshaft in the head of the engine, a pulley at the forward end portion of said camshaft at the forward end of the engine, a flexible drive means trained over the pulleys and connecting the pulleys together for imparting rotary motion of the crankshaft to the camshaft, a first bracket secured to the forward end of the engine block to one side of a straight line extended between the axes of the said pulleys, an idler pulley mounted on said bracket and engaged with an outer portion of the flexible drive means to take up slack in the flexible drive means resulting from normal wear, a second bracket secured to a forward end portion of said head of said engine near said pulley on said camshaft and on the opposite side of the line extended between the axes of the pulleys, an adjustment pulley mounted on said second bracket and engaged with said flexible drive means at an inner portion thereof, and adjustment means connected with said adjustment pulley to adjust the position of the adjustment pulley relative to the flexible drive means independently of adjustment of the idler pulley to compensate for changes in the distance between the crankshaft and camshaft resulting, for example, from milling the head of the engine.
Claim 3
Dependent Claim
69 words
Adjustment means as in claim 1 wherein said flexible drive means comprises a fan belt, said second bracket is apertured, fastening means extend through the apertures into the head, said second bracket having a slot therein, a shaft extended through said slot, said adjustment pulley rotatably mounted on the shaft, and means on the second bracket holding said shaft and pulley in a desired adjusted position in the slot.
Claim 4
Dependent Claim
29 words
The adjustment means as in claim 1 and wherein said means on said second bracket consists of set screws arranged in opposed position on either side of said shaft.
References Cited (Backward Citations)
US2010056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |