US3995458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laundry machine
Assignee: Engelhardt and Forster KG
•
Filing: 1975-02-24
•
Granted: 1976-12-07
•
Expires: 1995-02-24
Abstract
Abstract The invention relates to a laundry machine comprising a washing drum which is rotatable about its longitudinal axis; the generated surface of the drum being formed with apertures through which washing liquid can flow. The drum is supported, preferably by an endless retaining element, such that an outer surface of the drum is spaced apart from an inner surface portion of a casing. At least one partition extends substantially radially inside the drum thereby dividing the drum into discrete segments. The partition has an aperture and conveyor means are disposed inside the drum for conveying laundry from one segment of the drum to an adjacent segment thereof via the aperture. A flange extends substantially radially outwardly from the drum, and from between each pair of adjacent segments thereof, thereby dividing the gap between the drum and the casing into pockets or chambers, means being provided for obtaining a fluid-tight seal between each flange and the casing. Washing liquid may be fed to each pocket or chamber between the drum and the casing via respective pipes communicating therewith.
Inventors
- 👤 Heinz Grunewald
- 👤 Jurgen Wellbrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:17
CPC Classifications
D; D06; D06F; D06F31/00; D06F31/005
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
260 words
A laundry machine which comprises a washing drum having a longitudinal axis and a generated surface, said drum being rotatable about said longitudinal axis, said generated surface of the drum being formed with apertures through which washing liquid can flow, a casing having an inner surface portion which is spaced apart from an outer surface of the drum to define a gap therebetween, at least one partition which extends substantially radially inside the drum thereby dividing the drum into discrete segments, any two adjacent segments having contiguous end faces defined by a respective partition formed with an aperture, conveyor means disposed inside the drum for conveying laundry from one segment of the drum to an adjacent segment thereof via the aperture in the respective partition, a flange which extends substantially radially outwardly from the respective partition, and from between each pair of adjacent segments thereof, and each partition having a flange portion extending substantially axially of the drum, said casing comprising discrete casing sections corresponding to respective drum segments, any two adjacent casing sections being interconnected at end faces thereof facing each other but being spaced from each other, the casing having projecting portions at adjacent casing sections, said flange portions extending into the respective projecting portion, thereby dividing said gap between the drum and the casing into chambers, means providing a fluid-tight seal between each flange portion and the adjacent casing projecting portions and including a sealing member in frictional contact with the radially outer surface of said flange portion, and means for supplying washing liquid to each chamber.
Claim 2
Dependent Claim
260 words
A laundry machine which comprises a washing drum having a longitudinal axis and a generated surface, said drum being rotatable about said longitudinal axis, said generated surface of the drum being formed with apertures through which washing liquid can flow, a casing having an inner surface portion which is spaced apart from an outer surface of the drum to define a gap therebetween, at least one partition which extends substantially radially inside the drum thereby dividing the drum into discrete segments, any two adjacent segments having contiguous end faces defined by a respective partition formed with an aperture, conveyor means disposed inside the drum for conveying laundry from one segment of the drum to an adjacent segment thereof via the aperture in the respective partition, a flange which extends substantially radially outwardly from the respective partition, and from between each pair of adjacent segments thereof, and each partition having a flange portion extending substantially axially of the drum, said casing comprising discrete casing sections corresponding to respective drum segments, any two adjacent casing sections being interconnected at end faces thereof facing each other but being spaced from each other, the casing having projecting portions at adjacent casing sections, said flange portions extending into the respective projecting portion, thereby dividing said gap between the drum and the casing into chambers, means providing a fluid-tight seal between each flange portion and the adjacent casing projecting portions and including a sealing member in frictional contact with the radially outer surface of said flange portion, and means for supplying washing liquid to each chamber.
Claim 3
Dependent Claim
239 words
A laundry machine which comprises a washing drum having a longitudinal axis and a generated surface, said drum being rotatable about said longitudinal axis, said generated surface of the drum being formed with apertures through which washing liquid can flow, a casing having an inner surface portion which is spaced apart from an outer surface of the drum to define a gap therebetween, at least one partition which extends substantially radially inside the drum thereby dividing the drum into discrete segments, any two adjacent segments having contiguous end faces defined by a respective partition formed with an aperture, conveyor means disposed inside the drum for conveying laundry from one segment of the drum to an adjacent segment thereof via the aperture in the respective partition, a flange which extends substantially radially outwardly from the respective partition, and from between each pair of adjacent segments thereof, and each partition having a flange portion extending substantially axially of the drum, thereby dividing said gap between the drum and the casing into chambers, means providing a fluid-tight seal between each flange and the casing, and at least one endless retaining element comprising a flexible steel belt which is arranged to support the drum, and an intermediate ring made of a plastics material, such as polyamide, resistant to washing liquid disposed between said steel band and said flange portion, an inner surface of said band engaging an outer surface of said intermediate ring.
Claim 4
Dependent Claim
239 words
A laundry machine which comprises a washing drum having a longitudinal axis and a generated surface, said drum being rotatable about said longitudinal axis, said generated surface of the drum being formed with apertures through which washing liquid can flow, a casing having an inner surface portion which is spaced apart from an outer surface of the drum to define a gap therebetween, at least one partition which extends substantially radially inside the drum thereby dividing the drum into discrete segments, any two adjacent segments having contiguous end faces defined by a respective partition formed with an aperture, conveyor means disposed inside the drum for conveying laundry from one segment of the drum to an adjacent segment thereof via the aperture in the respective partition, a flange which extends substantially radially outwardly from the respective partition, and from between each pair of adjacent segments thereof, and each partition having a flange portion extending substantially axially of the drum, thereby dividing said gap between the drum and the casing into chambers, means providing a fluid-tight seal between each flange and the casing, and at least one endless retaining element comprising a flexible steel belt which is arranged to support the drum, and an intermediate ring made of a plastics material, such as polyamide, resistant to washing liquid disposed between said steel band and said flange portion, an inner surface of said band engaging an outer surface of said intermediate ring.
Claim 5
Dependent Claim
35 words
A machine according to claim 2, wherein the outer surface of the intermediate ring has a recess which is rectangular and of a predetermined width, in cross-section, and in which the steel band is received.
Claim 6
Dependent Claim
24 words
A machine according to claim 3, wherein said width of the recess is greater than the width of the steel band in said recess.
Claim 7
Dependent Claim
29 words
The machine according to claim 2, wherein the axial width of the ring is greater than the width of the axial flange portion in axial direction of said drum.
Claim 8
Dependent Claim
29 words
A machine according to claim 2, wherein the outer surface of the intermediate ring is spaced from a part of the casing in a direction radially of the drum.
Claim 9
Dependent Claim
19 words
A machine according to claim 2, wherein the retaining element extends around a radially outer portion of said flange.
Claim 10
Dependent Claim
54 words
A machine according to claim 2, comprising a reversible drive mechanism with a plurality of individual relatively short shafts disposed above the drum and extending substantially parallel to said longitudinal axis, a frame rigidly connected to said casing, said retaining element cooperating with said drive mechanism and being mounted on one of said shafts.
Claim 11
Dependent Claim
20 words
A machine according to claim 8, wherein one each of said shafts is associated with each segment of the drum.
Claim 12
Dependent Claim
13 words
A machine according to claim 8, wherein each short shaft is driven independently.
Claim 13
Dependent Claim
64 words
A machine according to claim 10, wherein said drive mechanism further comprises an electric motor, a plurality of drive pulleys respectively mounted on said shafts for rotation therewith, a plurality of V-belts respectively passed over said pulleys and driven by said motor, and a reversing pulley mounted for rotation with a respective short shaft and around which pulley passes a respective endless retaining element.
Claim 14
Dependent Claim
23 words
A machine according to claim 11, wherein each drive pulley has a hub, the respective reversing pulley being mounted on the respective hub.
Claim 15
Dependent Claim
18 words
A machine according to claim 11, wherein each reversing pulley has a friction lining on its outer surface.
Claim 16
Dependent Claim
64 words
A machine according to claim 11, wherein the retaining element passes around a respective reversing pulley which is disposed above the drum and which is disposed on a substantially horizontal rocker which extends at right-angles to the longitudinal axis of the drum, the rocker being mounted at one end for pivoting about a horizontal axis and having a resilient mounting at its other end.
Claim 17
Dependent Claim
26 words
A machine according to claim 14, wherein two adjacent ones of said rockers including respective drive mechanisms are horizontally offset at a 180° from one another.
Claim 18
Dependent Claim
33 words
A machine according to claim 14, wherein the rocker comprises two parallel arms between which the reversing pulley is disposed, each arm of the rocker being vertically adjustable independently of the other arm.
Claim 19
Dependent Claim
20 words
A machine according to claim 16, wherein each arm of the rocker is horizontally adjustable independently of the other arm.
Claim 20
Dependent Claim
18 words
A machine according to claim 16, wherein the arms of the rocker are carried on a common cross-member.
Claim 21
Dependent Claim
26 words
A machine according to claim 18, wherein the machine comprises a plurality of said rockers and wherein each cross-member is interconnected by means of a section-member.
Claim 22
Dependent Claim
27 words
A machine according to claim 14, wherein each rocker bears by way of a single spring element on the machine casing via the frame of the machine.
Claim 23
Dependent Claim
46 words
A machine according to claim 1, wherein the conveyor means comprises, in each segment of the drum, an inclined and sinuous chute which extends between a surface of one of said partitions of one segment and the aperture in the other partition of the same segment.
Claim 24
Dependent Claim
64 words
A machine according to claim 21, wherein the chute is a sheet of material comprising a segment of a circular disc, and a triangular portion one side of which is defined by only part of the length of the chord of the segment, the triangular portion being disposed within a circle which would be formed by a continuation of the arc of the segment.
Claim 25
Dependent Claim
27 words
A machine according to claim 1, wherein each of the apertures in the partitions are substantially sectors of a circle, the sector angle being less than 180°.
Claim 26
Dependent Claim
13 words
A machine according to claim 23, wherein the sector angle is approximately 60°.
Claim 27
Dependent Claim
36 words
A machine according to claim 1, wherein there is a substantially axially extending rib-like projection on part of the inner surface of each segment of the drum, which part is not occupied by the conveyor means.
Claim 28
Dependent Claim
37 words
A machine according to claim 1, wherein a sensor for operating one or more switches at one or more vertical settings of the drum is provided at least on a partition adjacent one end of the machine.
Claim 29
Dependent Claim
18 words
A machine according to claim 2, wherein at least one tensioning element is provided for the retaining element.
Claim 30
Dependent Claim
27 words
A machine according to claim 2, wherein the length of the endless retaining elements is such that the drum bears on the inner surface of the casing.
Claim 31
Dependent Claim
24 words
A machine according to claim 2, wherein the drum has a loading end and a discharge end and narrows funnel-wise towards its discharge end.
Claim 32
Dependent Claim
33 words
A machine according to claim 29, wherein a helical conveyor is disposed in the funnel-shaped end portion of the drum and serves to eject batches of laundry from such end portion after laundering.
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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) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |