US4345513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric toaster
Assignee: Pifco Ltd
•
Filing: 1981-02-17
•
Granted: 1982-08-24
•
Expires: 2001-02-17
Abstract
Abstract A toaster for toasting a slice of bread comprises a casing in which a reciprocable carriage is located and is movable towards and away from an aperture defined by the casing through which aperture a slice of bread when mounted on the carriage can pass. A pair of enclosed electric bar heating elements is disposed within the casing respectively adjacent opposed side edges of the casing defining the aperture. A motor arrangement is provided for the carriage which can thereby be driven from a first position remote from the aperture into a second position at a predetermined speed. In this way a slice of bread mounted on the carriage can be made to pass between the elements to toast both sides of the slice progressively as the slice passes out of the casing through the aperture. The degree of toasting is determined by the speed of movement of the carriage.
Inventors
- 👤 David Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:18
CPC Classifications
A; A47; A47J; A47J37/00; A47J37/06; A47J37/08; A47J37/0857; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18688
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
236 words
A toaster for toasting a slice of bread, comprising: a casing in which is located a reciprocable carriage movable towards and away from an aperture defined by said casing, through which aperture a slice of bread when mounted on said carriage can pass, a pair of enclosed electric bar heating elements disposed within said casing respectively adjacent opposed side edges of the casing which define said aperture, and a motor arrangement for driving said carriage from a first position located remote from said aperture towards said aperture into a second position at a predetermined speed, whereby a slice of bread mounted on said carriage can be made to pass between said elements to toast both sides of the slice progessively as the slice passes out of said casing through said aperture, the degree of toasting being determined by the speed of movement of said carriage, the motor arrangement comprising a vertically oriented screw threaded rod, a motor for rotatably driving said screw threaded rod, a frame mounted on the rod and forming a part of the carriage, and brush means carried on the frame with bristles which contact the screw threaded surface of the rod, operation of said motor to rotate said rod causing said bristles to follow the screw thread of the rod to move the frame and thereby the carriage along the rod from the first position of the carriage into the second position.
Claim 2
Dependent Claim
236 words
A toaster for toasting a slice of bread, comprising: a casing in which is located a reciprocable carriage movable towards and away from an aperture defined by said casing, through which aperture a slice of bread when mounted on said carriage can pass, a pair of enclosed electric bar heating elements disposed within said casing respectively adjacent opposed side edges of the casing which define said aperture, and a motor arrangement for driving said carriage from a first position located remote from said aperture towards said aperture into a second position at a predetermined speed, whereby a slice of bread mounted on said carriage can be made to pass between said elements to toast both sides of the slice progessively as the slice passes out of said casing through said aperture, the degree of toasting being determined by the speed of movement of said carriage, the motor arrangement comprising a vertically oriented screw threaded rod, a motor for rotatably driving said screw threaded rod, a frame mounted on the rod and forming a part of the carriage, and brush means carried on the frame with bristles which contact the screw threaded surface of the rod, operation of said motor to rotate said rod causing said bristles to follow the screw thread of the rod to move the frame and thereby the carriage along the rod from the first position of the carriage into the second position.
Claim 3
Dependent Claim
31 words
A toaster as claimed in claim 1, in which said bristles are sufficiently flexible to enable said carriage to be manually moved from the second position back into the first position.
Claim 4
Dependent Claim
47 words
A toaster as claimed in claim 1, in which said carriage comprises a bread support member attached to said frame, said support member being capable of travel between said elements so that a slice of bread mounted on said support can be completely toasted on both sides.
Claim 5
Dependent Claim
65 words
A toaster as claimed in claim 1, in which said motor arrangement and said heating elements are connected into an electrical circuit which, when connected to an electrical power supply, can be activated to cause operation of said motor arrangement and heating of said elements by movement of said carriage into the first position and deactivated by attainment of the second position by said carriage.
Claim 6
Dependent Claim
34 words
A toaster as claimed in claim 4, in which an override switch is provided whereby said motor arrangement and said heating elements can be activated when said carriage does not occupy the first position.
Claim 7
Dependent Claim
32 words
A toaster as claimed in claim 4, in which an override switch is provided whereby said motor arrangement and said heating elements can be deactivated regardless of the position of said carriage.
Claim 8
Dependent Claim
43 words
A toaster as claimed in claim 1, further comprising means for varying the speed of movement of said carriage whereby a speed can be preselected before operation of said motor arrangement according to the required degree of toasting of the slice of bread.
Claim 9
Dependent Claim
43 words
A toaster as claimed in claim 7, in which a potentiometer is connected to said motor whereby the rotary speed of said rod can be varied as desired and thereby the speed of said carriage varied to determine the degree of toasting required.
Claim 10
Dependent Claim
47 words
A toaster as claimed in claim 8, in which a pair of grilles is located within the toaster between which grilles said carriage reciprocates whereby said grilles guide a slice of bread mounted on said carriage towards said aperture as the latter moves towards the second position.
Claim 11
Dependent Claim
56 words
A toaster as claimed in claim 9, in which a first pair of reflectors is located within the toaster between which reflectors said grilles are located and a second pair of reflectors is located normal to said first pair and each defines a longitudinal slot in which a portion of one end of said carriage reciprocates.
Claim 12
Dependent Claim
41 words
A toaster as claimed in claim 1, in which said carriage reciprocates vertically and a reflective plate is located at the base of the toaster, which plate catches crumbs falling from the bread slice and can be exposed for cleaning purposes.
Claim 13
Dependent Claim
23 words
A toaster as claimed in claim 1, in which said heating elements each comprise an electrical coil enclosed within a sealed glass tube.
Claim 14
Dependent Claim
35 words
A toaster as claimed in claim 1, in which said aperture comprises a rectangular slot and said elements are respectively located adjacent the longer sides of the slot in a parallel disposition within said casing.
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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) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |