Patent US3874248A successfully refreshed from Google Patents.
US3874248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shift mechanism for transmissions
Assignee: Dana Inc
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Filing: 1973-07-18
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Granted: 1975-04-01
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Expires: 1993-07-18
Abstract
Abstract Shift mechanism is provided for transmissions, and particularly small transmissions used on riding lawn mowers, garden tractors, and the like. The shift mechanism has a pivotable shift lever which requires the operator to interrupt the motion of the lever when shifting from neutral to reverse and from neutral to each forward speed, the interruption requiring releasing the lever or even reversing it slightly. This enables the operator to know by feel what gear the transmission is in. At the same time, the transmission can quickly be shifted from reverse to neutral or from any forward speed down to or toward neutral without interruption. The shift mechanism includes the movable shift lever, a carrier engaged by the shift lever and having a predetermined path of movement, a pawl member pivotally carried by the carrier, and a stop member engageable by the pawl member to control the movement of the carrier, the pawl member, and the lever.
Inventors
- 👤 Hans Hauser
- 👤 Ronald N Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:38
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; F16H63/08; F16H63/14; G; G05; G05G; G05G7/00; G05G7/02; G05G7/06; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1553; Y10T74/1555; Y10T74/1556; Y10T74/20; Y10T74/20012; Y10T74/20018; Y10T74/20085; Y10T74/20104; Y10T74/20116; Y10T74/21; Y10T74/2133; Y10T74/2136; Y10T74/214
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
93 words
Mechanism for shifing a transmission comprising a movable shift lever, a pawl carrier movable in a path and having a plurality of positions corresponding in number to the number of in-gear and neutral positions of the transmission, means for guiding said pawl carrier in the path, pawl means movably mounted relative to said carrier and engageable by said shift lever for movement relative to said carrier, and a stop member for limiting continuous movement of said shift lever in one direction, which movement is sufficient to shift the transmission to the next position.
Claim 2
Dependent Claim
93 words
Mechanism for shifing a transmission comprising a movable shift lever, a pawl carrier movable in a path and having a plurality of positions corresponding in number to the number of in-gear and neutral positions of the transmission, means for guiding said pawl carrier in the path, pawl means movably mounted relative to said carrier and engageable by said shift lever for movement relative to said carrier, and a stop member for limiting continuous movement of said shift lever in one direction, which movement is sufficient to shift the transmission to the next position.
Claim 3
Dependent Claim
20 words
Mechanism according to claim 1 characterized by said shift lever being pivotally mounted in an upper wall of the transmission.
Claim 4
Dependent Claim
19 words
Mechanism according to claim 1 characterized by a shifter fork, and means connecting said shift fork with said carrier.
Claim 5
Dependent Claim
15 words
Mechanism according to claim 1 characterized by a shifter fork connected to said shift lever.
Claim 6
Dependent Claim
19 words
Mechanism according to claim 1 characterized by said stop member being spring loaded and urged toward a central position.
Claim 7
Dependent Claim
16 words
Mechanism according to claim 1 characterized by said stop member being stationary in a fixed position.
Claim 8
Dependent Claim
31 words
Mechanism according to claim 1 characterized by said pawl means having a pAir of spaced dogs and being pivotally mounted on said carrier at a point equally spaced from said dogs.
Claim 9
Dependent Claim
24 words
Mechanism according to claim 1 characterized by said pawl means comprising two separately movable pawls pivotally mounted on said carrier at a common point.
Claim 10
Dependent Claim
22 words
Mechanism according to claim 1 characterized by resilient means for urging said pawl means in a direction away from said stop member.
Claim 11
Dependent Claim
37 words
Mechanism according to claim 1 characterized by said guide means and said carrier having ball and recess means for holding said carrier relative to said guide means in each of the plurality of positions of said carrier.
Claim 12
Dependent Claim
25 words
Mechanism according to claim 10 characterized by there being one ball and a plurality of recesses corresponding to the plurality of positions of said carrier.
Claim 13
Dependent Claim
42 words
Mechanism according to claim 1 characterized by said stop member having a plurality of teeth corresponding to certain positions of said transmission, said teeth being engaged by said pawl means to limit the movement of said pawl means and said shift lever.
Claim 14
Dependent Claim
18 words
Mechanism accordinng to claim 1 characterized by the predetermined path of said pawl carrier being a straight line.
Claim 15
Dependent Claim
18 words
Mechanism according to claim 1 characterized by the predetermined path of said pawl carrier being a curved line.
Claim 16
Dependent Claim
93 words
Mechanism for shifting a transmission having a housing, said mechanism comprising a pivotable shift lever carrier by the housing, a pawl carrier, means on the housing of the transmission for guiding said pawl carrier in a path, pawl means pivotally mounted on said carrier for pivotal movement relative to said carrier, the pivotal movement being effected by said shift lever movement, and a stop member engageable by said pawl means when pivotally moved for limiting the extend of continuous movement of said carrier, said pawl means, and said shift lever in one direction.
Claim 17
Dependent Claim
93 words
Mechanism for shifting a transmission having a housing, said mechanism comprising a pivotable shift lever carrier by the housing, a pawl carrier, means on the housing of the transmission for guiding said pawl carrier in a path, pawl means pivotally mounted on said carrier for pivotal movement relative to said carrier, the pivotal movement being effected by said shift lever movement, and a stop member engageable by said pawl means when pivotally moved for limiting the extend of continuous movement of said carrier, said pawl means, and said shift lever in one direction.
Claim 18
Dependent Claim
20 words
Mechanism according to claim 15 characterized by said shift lever being pivotally mounted in an upper wall of said transmission.
Claim 19
Dependent Claim
19 words
Mechanism according to claim 15 characterized by a shifter fork, and means connecting said shifter fork with said carrier.
Claim 20
Dependent Claim
19 words
Mechanism according to claim 15 characterized by said stop member being spring loaded and urged toward a central position.
Claim 21
Dependent Claim
18 words
Mechanism according to claim 15 characterized by said stop member being stationary and held in a fixed position.
Claim 22
Dependent Claim
40 words
Mechanism according to claim 15 characterized by said pawl means includes a pair of spaced dogs extending in opposite directions with said pawl means being pivotally connected to said carrier at a point equally spaced from both of said dogs.
Claim 23
Dependent Claim
20 words
Mechanism according to claim 15 characterized by said pawl means comprising two separate pawls each pivotally connected to said carrier.
Claim 24
Dependent Claim
26 words
Mechanism according to claim 21 characterized by each of said pawls having a projection engageable by said shift lever for pivotal movement relative to said carrier.
Claim 25
Dependent Claim
44 words
Mechanism according to claim 15 characterized by said pawl means being pivoted to said carrier by a pin, and resilient means acting on said pin to urge said pawl means in a direction transverse to the direction of pivotal movement of said shift lever.
Claim 26
Dependent Claim
36 words
Mechanism according to claim 15 characterized by said guide means and said carrier having detent means for holding said carrier relative to said guide means in each of a plurality of spaced positions of said carrier.
Claim 27
Dependent Claim
42 words
Mechanism according to claim 15 characterized by said stop member having a plurality of teeth corresponding to certain positions of said transmission, said teeth being engaged by said pawl means to limit the movement of said pawl means and said shift lever.
Claim 28
Dependent Claim
29 words
Mechanism according to claim 25 characterized by the number of teeth of said stop member being two less than the total number of positions, including neutral, of said transmission.
Claim 29
Dependent Claim
18 words
Mechanism according to claim 15 characterized by the predetermined path of said pawl carrier being a straight line.
Claim 30
Dependent Claim
18 words
MechAnism according to claim 15 characterized by the predetermined path of said pawl carrier being a curved line.
Claim 31
Dependent Claim
106 words
Mechanism for shifting a transmission comprising a movable shift lever, a pawl carrier movable in a path and having a plurality of positions corresponding in number to the number of in-gear and neutral positions of the transmission, means for guiding said pawl carrier in the path, pawl means movably mounted relative to said carrier engageable by said shift lever for movement relative to said carrier, said pawl means having two upwardly extending projections between which said shift lever extends, and a stop member for limiting continuous movement of said shift lever in one direction, which movement is sufficient to shift the transmission to the next position.
Claim 32
Dependent Claim
106 words
Mechanism for shifting a transmission comprising a movable shift lever, a pawl carrier movable in a path and having a plurality of positions corresponding in number to the number of in-gear and neutral positions of the transmission, means for guiding said pawl carrier in the path, pawl means movably mounted relative to said carrier engageable by said shift lever for movement relative to said carrier, said pawl means having two upwardly extending projections between which said shift lever extends, and a stop member for limiting continuous movement of said shift lever in one direction, which movement is sufficient to shift the transmission to the next position.
Claim 33
Dependent Claim
93 words
Mechanism for shifting a transmission comprising a pivotable shift lever, a pawl carrier, means for guiding said pawl carrier in a path, pawl means pivotally mounted on said carrier for pivotal movement relative to said carrier, said pawl means having two spaced, upwardly extending projections between which said shift lever extends, the pivotal movement being effected by said shift lever movement, and a stop member engageable by said pawl means when pivotally moved for limiting the extend of continuous movement of said carrier, said pawl means, and said shift lever in one direction.
Claim 34
Dependent Claim
93 words
Mechanism for shifting a transmission comprising a pivotable shift lever, a pawl carrier, means for guiding said pawl carrier in a path, pawl means pivotally mounted on said carrier for pivotal movement relative to said carrier, said pawl means having two spaced, upwardly extending projections between which said shift lever extends, the pivotal movement being effected by said shift lever movement, and a stop member engageable by said pawl means when pivotally moved for limiting the extend of continuous movement of said carrier, said pawl means, and said shift lever in one direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |