# US 9,518,771 B2 · Twistable tray for heater less ice maker

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- Number: US 9,518,771 B2
- Document ID: US9518771B2
- Status: Granted
- Kind: B2
- Application number: 13/834,814
- Filed: 2013-03-15
- Published: 2013-11-07
- Granted: 2016-12-13
- Earliest claimed: 2012-05-03
- Assignees: Whirlpool Corporation
- Applicants: Whirlpool Corporation
- Inventors: Michael J. Bauman; James C. Guarino; Steven J. Kuehl; Yen-Hsi Lin
- Web page: https://patentgrep.com/patent/US9518771B2

## CPC

- F25C 1/24: for refrigerators, e.g. freezing trays
- F25C 1/10: by using rotating or otherwise moving moulds (F25C1/08 takes precedence)
- F25C 5/06: by deforming bodies with which the ice is in contact, e.g. using inflatable members
- F25C 2305/0221: rotating ice mould
- F25C: PRODUCING, WORKING OR HANDLING ICE

## Abstract

An ice maker is provided that includes a tray having recesses that can include ice-phobic surfaces. The ice-phobic surfaces may include ice-phobic coatings, textured metal surfaces, hydrophobic coatings or other surfaces configured to repel water and ice. The tray can be formed from metal material and may exhibit a fatigue limit greater than about 150 Megapascals (MPa) at 105 cycles. The ice maker further includes a frame body coupled to the tray, and a driving body that is rotatably coupled to the tray. The driving body is further adapted to rotate the tray in a clockwise and/or counter-clockwise cycle such that the tray presses against the frame body in a manner that flexes the tray to dislodge ice pieces formed in the recesses of the tray.

## Claims

### Claim 1

A twistable, heater-less ice tray for an ice maker assembly, the ice tray comprising:
a metal material;
a plurality of recesses, wherein a geometric center of one or more of the recesses is substantially at a distance from a longitudinal center line of the ice tray; and
a plurality of weirs in fluid connection with one or more of the recesses, wherein a center line of one or more of the weirs is disposed substantially angled with respect to the longitudinal center line of the tray, and
further wherein each recess comprises an ice-phobic surface for direct contact with an ice piece, the ice-phobic surface comprises the metal material, is formed from the tray, is roughened at a microscopic level and is characterized by a water contact angle (θc) of at least 90 degrees for a 5 milliliter droplet of water.

### Claim 2 (depends on 1)

The ice tray according to claim 1, wherein the metal material possesses a thermal conductivity of at least 7 W/m*K.

### Claim 3 (depends on 1)

The ice tray according to claim 1, wherein the metal material is a stainless steel.

### Claim 4

A twistable, heater-less ice tray for an ice maker assembly, the ice tray comprising:
a metal material;
a plurality of recesses, wherein a major axis of one or more of the recesses is substantially angled with respect to a line normal to the longitudinal center line of the tray; and
a plurality of weirs in fluid connection with one or more of the recesses, wherein a center line of one or more of the weirs is disposed substantially at a distance from the longitudinal center line of the ice tray, and
further wherein each recess comprises an ice-phobic surface for direct contact with an ice piece, the ice-phobic surface comprises the metal material, is formed from the tray, is roughened at a microscopic level and is characterized by a water contact angle (θc) of at least 90 degrees for a 5 milliliter droplet of water.

### Claim 5 (depends on 4)

The ice tray according to claim 4, wherein the metal material possesses a thermal conductivity of at least 7 W/m*K.

### Claim 6 (depends on 4)

The ice tray according to claim 4, wherein the metal material is a stainless steel.

### Claim 7

A twistable, heater-less ice tray for an ice maker assembly, the ice tray comprising:
a metal material;
a plurality of recesses of a substantially oval-shaped top cross section, wherein a geometric center of one or more of the recesses is substantially at a distance from a longitudinal center line of the ice tray and wherein a major axis of one or more of the recesses is substantially angled with respect to the longitudinal center line of the ice tray; and
a plurality of weirs in fluid connection with the recesses, wherein a center line of the weirs is disposed substantially angled with respect to the longitudinal center line of the tray, and wherein the center line of the weirs is disposed substantially at a distance from the longitudinal center line of the ice tray,
wherein each recess comprises an ice-phobic surface for direct contact with an ice piece, the ice-phobic surface comprises the metal material, is formed from the tray, is roughened at a microscopic level and is characterized by a water contact angle (θc) of at least 90 degrees for a 5 milliliter droplet of water, and
further wherein the recesses are staggered and spaced apart by the weirs.

### Claim 8 (depends on 7)

The ice tray according to claim 7, wherein the metal material possesses a thermal conductivity of at least 7 W/m*K.

### Claim 9 (depends on 7)

The ice tray according to claim 7, wherein the metal material is a stainless steel.