US3628478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanism for selectively retaining or removing an exchangeable pattern
Assignee: Singer Co
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Filing: 1970-08-17
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Granted: 1971-12-21
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Expires: 1990-08-17
Abstract
Abstract A pattern cam removal device for removing a seated pattern cam upwardly from the interior of a sewing machine to an accessible position. A plunger is slidable axially relatively to the cam shaft and at the lower end of the plunger there is attached a pronged elevator member. When the plunger is raised, the pronged elevator member raises a pattern cam to a position where it is accessible for exchange. A pair of resilient-retaining fingers hold the pattern cam in place on the base portion of the device.
Inventors
- 👤 John C Seck
- 👤 Howard D Rogers
- 👤 Thomas G Graham
- 👤 James H Hannen Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:49
CPC Classifications
D; D05; D05B; D05B19/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
In an ornamental stitch sewing machine of the type having a laterally jogging needle bar responsive to a rotating stitch pattern cam mounted on a rotating cam shaft, a pattern cam removal device adapted for removing a mounted pattern cam comprising: a. a base portion supported on said cam shaft and rotatable with said cam shaft; b. a central hub integral with said base portion having an axial bore therethrough; c. a plunger fitted within said axial bore; d. at least one resilient-retaining finger for retaining a pattern cam on the base portion; e. a cam elevator connected to the plunger and directly operative thereby, said cam elevator underlying the mounted pattern cam whereby, as the plunger is raised the cam elevator is also raised forcing the mounted pattern cam upwardly on the central hub beyond the restraining influence of the resilientretaining finger until the cam rests in an easily accessible position.
Claim 2
Dependent Claim
152 words
In an ornamental stitch sewing machine of the type having a laterally jogging needle bar responsive to a rotating stitch pattern cam mounted on a rotating cam shaft, a pattern cam removal device adapted for removing a mounted pattern cam comprising: a. a base portion supported on said cam shaft and rotatable with said cam shaft; b. a central hub integral with said base portion having an axial bore therethrough; c. a plunger fitted within said axial bore; d. at least one resilient-retaining finger for retaining a pattern cam on the base portion; e. a cam elevator connected to the plunger and directly operative thereby, said cam elevator underlying the mounted pattern cam whereby, as the plunger is raised the cam elevator is also raised forcing the mounted pattern cam upwardly on the central hub beyond the restraining influence of the resilientretaining finger until the cam rests in an easily accessible position.
Claim 3
Dependent Claim
84 words
The pattern cam removal device as recited in claim 1 further comprising: a. said base portion having a plurality of slots formed therethrough; b. said cam elevator operatively connected to the plunger beneath the base portion, the cam elevator having vertical prongs in registration with the plurality of slots through the base portion, whereby as the plunger is raised the vertical prongs are moved upwardly through the plurality of slots to contact the pattern cam mounted on the base portion and raise it upwardly.
Claim 4
Dependent Claim
41 words
The pattern cam removal means as recited in claim 2 wherein the cam elevator has a washerlike base portion having a central aperture and three prongs extending vertically therefrom, said cam elevator being secured to the lower portion of the plunger.
Claim 5
Dependent Claim
89 words
The pattern cam removal device as recited in claim 1 further comprising: a. a pair of vertically mounted resilient-retaining fingers for retaining a pattern cam on the base portion; b. the base portion having a pair of diametrically disposed recesses for mounting the resilient-retaining fingers; c. the central hub having a pair of diametrically disposed vertical notches aligned with the recesses in the base portion for accepting the retaining fingers flush with the central hub when a pattern cam is being mounted on or removed from the central hub.
Claim 6
Dependent Claim
27 words
The pattern cam removal device as recited in claim 4 wherein the retaining fingers partially overlie a pattern cam when it is seated on the base portion.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |