US3754450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interchangeable backing plate for movable wall of a servomotor
Assignee: Bendix Corp
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Filing: 1971-09-27
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Granted: 1973-08-28
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Expires: 1991-09-27
Abstract
Abstract A method of placing and retaining a backing plate on a valve control retaining hub of a servomotor adjacent a diaphragm.
Inventors
- 👤 James B Putt
- 👤 Oswald O Kytta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:45
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T13/569
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
319 words
Wall means for dividing the interior of a housing of a servomotor of a predetermined diameter into a front and rear chamber, said wall means comprising: hub means having a central bore with a first passage connected to said front chamber and a second passage connected to said rear chamber, said hub means having an annular support extending radially from the exterior of the hub means on the end in the front chamber, said hub means having a groove located between said support and an annular ledge with a shoulder adjacent said support, said hub means having a transverse slot extending from the bottom of said groove into the central bore; a backing plate having an outer diameter corresponding to the diameter of the housing of the servomotor with an axial opening whose diameter is smaller than said annular ledge, said backing plate having a concentric slot extending from said axial opening to permit said backing plate to pass over said ledge and be set on said shoulder; valve means located in said central bore of the hub means for controlling the alternate communication of vacuum from the front chamber through the first passage and air at atmospheric pressure through said central bore to the rear chamber through the second passage to create an operational pressure differential in response to an actuation force; key means located in said transverse slot for retaining said valve means in said central bore; diaphragm means having an outer periphery secured to the housing of the servomotor and an inner periphery secured in said groove of the hub means for holding said key means in said transverse slot and for providing a uniform compressive force to urge said backing plate against said annular support to prevent movement therebetween, said operational pressure differential creating a force on said diaphragm means, said force being transferred through said diaphragm plate to cause said hub means to move.
Claim 2
Dependent Claim
319 words
Wall means for dividing the interior of a housing of a servomotor of a predetermined diameter into a front and rear chamber, said wall means comprising: hub means having a central bore with a first passage connected to said front chamber and a second passage connected to said rear chamber, said hub means having an annular support extending radially from the exterior of the hub means on the end in the front chamber, said hub means having a groove located between said support and an annular ledge with a shoulder adjacent said support, said hub means having a transverse slot extending from the bottom of said groove into the central bore; a backing plate having an outer diameter corresponding to the diameter of the housing of the servomotor with an axial opening whose diameter is smaller than said annular ledge, said backing plate having a concentric slot extending from said axial opening to permit said backing plate to pass over said ledge and be set on said shoulder; valve means located in said central bore of the hub means for controlling the alternate communication of vacuum from the front chamber through the first passage and air at atmospheric pressure through said central bore to the rear chamber through the second passage to create an operational pressure differential in response to an actuation force; key means located in said transverse slot for retaining said valve means in said central bore; diaphragm means having an outer periphery secured to the housing of the servomotor and an inner periphery secured in said groove of the hub means for holding said key means in said transverse slot and for providing a uniform compressive force to urge said backing plate against said annular support to prevent movement therebetween, said operational pressure differential creating a force on said diaphragm means, said force being transferred through said diaphragm plate to cause said hub means to move.
Claim 3
Dependent Claim
39 words
The wall means, as recited in claim 1, further including: land means located on said hub means adjacent said shoulder corresponding to said concentric slot on said backing plate to prevent said backing plate from rotating on said shoulder.
Claim 4
Dependent Claim
41 words
The wall means, as recited in claim 2, wherein said land means is located adjacent said transverse slot in the hub means to provide a substantially planar surface with said backing plate to assure a sealable seat for said diaphragm means.
Claim 5
Dependent Claim
34 words
The wall means, as recited in claim 3, wherein said backing plate includes: a skirt secured to the outer diameter of said backing plate to provide a smooth surface for contacting said diaphragm means.
Claim 6
Dependent Claim
29 words
The wall means, as recited in claim 4, wherein said ledge prevents the diaphragm means from moving upon receiving an opposing force through the backing plate and hub means.
Claim 7
Dependent Claim
200 words
Wall means for dividing the interior of a housing of a servomotor of a predetermined diameter into a front and rear chamber, said wall means comprising: hub means for retaining an operational control valve responsive to an operator input to activate the servomotor, said hub means having an external periphery with a groove located therein between a shoulder and an annular ledge, said hub means having a support extending radially from said shoulder, said annular ledge having a larger diameter than said shoulder; a backing plate having an outer diameter corresponding to the diameter of the housing of the servomotor with an axial opening whose diameter is smaller than said annular ledge, said backing plate having a slot concentric to said axial opening to permit said backing plate to pass over said annular ledge and engage said shoulder; and diaphragm means having an outer periphery secured to the housing of the servomotor and an inner periphery secured in said groove of the hub means for providing a uniform compressive force to urge said backing plate against said annular support to prevent movement and form a fluid seal with said annular ledge upon movement of the wall means in the housing.
Claim 8
Dependent Claim
200 words
Wall means for dividing the interior of a housing of a servomotor of a predetermined diameter into a front and rear chamber, said wall means comprising: hub means for retaining an operational control valve responsive to an operator input to activate the servomotor, said hub means having an external periphery with a groove located therein between a shoulder and an annular ledge, said hub means having a support extending radially from said shoulder, said annular ledge having a larger diameter than said shoulder; a backing plate having an outer diameter corresponding to the diameter of the housing of the servomotor with an axial opening whose diameter is smaller than said annular ledge, said backing plate having a slot concentric to said axial opening to permit said backing plate to pass over said annular ledge and engage said shoulder; and diaphragm means having an outer periphery secured to the housing of the servomotor and an inner periphery secured in said groove of the hub means for providing a uniform compressive force to urge said backing plate against said annular support to prevent movement and form a fluid seal with said annular ledge upon movement of the wall means in the housing.
Claim 9
Dependent Claim
39 words
The wall means as recited in claim 6, further including: land means located on said hub means adjacent said shoulder corresponding to said concentric slot on said backing plate to prevent said backing plate from rotating on said shoulder.
Claim 10
Dependent Claim
34 words
The wall means, as recited in claim 7, wherein said backing plate includes: a skirt secured to the outer diameter of said backing plate to provide a smooth surface for contacting said diaphragm means.
Claim 11
Dependent Claim
29 words
The wall means, as recited in claim 8, wherein said ledge prevents the diaphragm means from moving upon receiving an opposing force through the backing plate and hub means.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |