US4928956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed-adjusting mechanism of a tread mill
Assignee: Individual
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Filing: 1988-09-13
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Granted: 1990-05-29
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Expires: 2008-09-13
Abstract
Abstract The present invention provides a speed adjusting transmission mechanism for adjusting the speed of a rotative belt of a tread mill which comprises an adjustment transmission shaft provided movably between an output shaft of a motor and a driven shaft associated with the rotative belt. The movable transmission shaft is held by a vertical plate which is mounted on a pair of vertical guide supports and which is slideable along vertical rail grooves of the guide supports. This support means is simple and durable. The mechanism further includes V-belt carrying pulleys respectively mounted on the output shaft, two opposite ends of the transmission shaft and one end of the driven shaft. The pulleys mounted on the output shaft and on one end of the transmission shaft each comprise two cone-shaped discs one of which is slideable. A reversible motor in combination with a screw drive means is also provided for moving the holder plate of the transmission shaft so that the speed of the motion transmitted by the V-belts can be adjusted.
Inventors
- 👤 Chao-Yang Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:42
CPC Classifications
A; A63; A63B; A63B22/00; A63B22/0015; A63B22/0023; A63B22/02; A63B22/0235; A63B22/0242; A63B22/0257; F; F16; F16H; F16H9/00; F16H9/02; F16H9/04; F16H9/12; F16H9/14; F16H9/16; F16H2009/166
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
249 words
A speed adjusting transmission mechanism for adjusting the speed of a rotative belt of a tread mill which comprises a driving motor having an output shaft, a driven shaft associated with said rotative belt, a transmission shaft provided between said output shaft and said driven shaft, a pair of spaced apart vertical guide supports each of which has a vertical rail groove, a shaft holding means mounted slideably on said guide supports and carrying said transmission shaft, said means being movable along said rail groove to increase or decrease distances between said transmission shaft and said output and driven shafts, a first pulley mounted on said output shaft, said first pulley having two cone-shaped discs one of which is slideable, a second pulley mounted on a first end of said transmission shaft, a third pulley mounted on a second end of said transmission shaft and having two cone-shaped discs one of which is slideable, a fourth pulley mounted on said driven shaft, a first V-belt passing over said first pulley and said second pulley, a second V-belt passing over said third pulley and said fourth pulley, and means for displacing said shaft holding means, thereby to change the distances between said transmission shaft and said output and driven shafts and to position said first and second V-belts more or less deeply into said first and third pulleys, whereby said fourth pulley is rotated at slower or faster speeds, respectively, to drive the rotative belt at slower or faster speeds.
Claim 2
Dependent Claim
249 words
A speed adjusting transmission mechanism for adjusting the speed of a rotative belt of a tread mill which comprises a driving motor having an output shaft, a driven shaft associated with said rotative belt, a transmission shaft provided between said output shaft and said driven shaft, a pair of spaced apart vertical guide supports each of which has a vertical rail groove, a shaft holding means mounted slideably on said guide supports and carrying said transmission shaft, said means being movable along said rail groove to increase or decrease distances between said transmission shaft and said output and driven shafts, a first pulley mounted on said output shaft, said first pulley having two cone-shaped discs one of which is slideable, a second pulley mounted on a first end of said transmission shaft, a third pulley mounted on a second end of said transmission shaft and having two cone-shaped discs one of which is slideable, a fourth pulley mounted on said driven shaft, a first V-belt passing over said first pulley and said second pulley, a second V-belt passing over said third pulley and said fourth pulley, and means for displacing said shaft holding means, thereby to change the distances between said transmission shaft and said output and driven shafts and to position said first and second V-belts more or less deeply into said first and third pulleys, whereby said fourth pulley is rotated at slower or faster speeds, respectively, to drive the rotative belt at slower or faster speeds.
Claim 3
Dependent Claim
51 words
A speed adjusting transmission mechanism as claimed in claim 1, wherein said shaft holding means is a vertical plate member provided between said vertical guide supports, said plate having two vertical opposite ends respectively received in said rail grooves and a lug means having a hole means receiving said transmission shaft.
Claim 4
Dependent Claim
60 words
A speed adjusting transmission mechanism as claimed in claim 1, wherein said means for displacing said shaft holding means includes an adjustment motor, a screw drive means in connection with said shaft holding means, said screw drive means being rotatable about a vertical axis, and means for transmitting the output motion of said adjustment motor to said screw drive means.
Claim 5
Dependent Claim
35 words
A speed adjusting transmission mechanism as claimed in claim 3, wherein said means for transmitting the output motion of said adjustment motor further includes means for limiting ascent and descent of said shaft holding means.
Claim 6
Dependent Claim
258 words
A speed adjusting transmission mechanism for adjusting the speed of a rotative belt of a tread mill which comprises a driving motor having an output shaft, a driven shaft associated with said rotative belt, a transmission shaft provided between said output shaft and said driven shaft, a pair of spaced apart vertical guide supports each of which has a vertical rail groove, a shaft holding means mounted slideably on said guide supports and carrying said transmission shaft, said means being movable along said rail groove to increase or decrease distances between said transmission shaft and said output and driven shafts, a first pulley mounted on said output shaft, a second pulley mounted on a first end of said transmission shaft, a third pulley mounted on a second end of said transmission shaft, a fourth pulley mounted on said driven shaft, a first V-belt passing over said first pulley and said second pulley, a second V-belt passing over said third pulley and said fourth pulley, at least one of said pulleys having a structure including two cone-shaped discs, one of which is slideable relative to the other, and means for displacing said shaft holding means, thereby to change a distance between said transmission shaft and at least one of said output and said driven shaft and to position at least one of said first and second V-belts more or less deeply into at least one of said pulleys, whereby said fourth pulley is rotated at slower or faster speeds, to drive the rotative belt at slower or faster speeds.
Claim 7
Dependent Claim
258 words
A speed adjusting transmission mechanism for adjusting the speed of a rotative belt of a tread mill which comprises a driving motor having an output shaft, a driven shaft associated with said rotative belt, a transmission shaft provided between said output shaft and said driven shaft, a pair of spaced apart vertical guide supports each of which has a vertical rail groove, a shaft holding means mounted slideably on said guide supports and carrying said transmission shaft, said means being movable along said rail groove to increase or decrease distances between said transmission shaft and said output and driven shafts, a first pulley mounted on said output shaft, a second pulley mounted on a first end of said transmission shaft, a third pulley mounted on a second end of said transmission shaft, a fourth pulley mounted on said driven shaft, a first V-belt passing over said first pulley and said second pulley, a second V-belt passing over said third pulley and said fourth pulley, at least one of said pulleys having a structure including two cone-shaped discs, one of which is slideable relative to the other, and means for displacing said shaft holding means, thereby to change a distance between said transmission shaft and at least one of said output and said driven shaft and to position at least one of said first and second V-belts more or less deeply into at least one of said pulleys, whereby said fourth pulley is rotated at slower or faster speeds, to drive the rotative belt at slower or faster speeds.
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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |