# US 7,611,083 B2 · Safety device for feeder of shredder

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- Number: US 7,611,083 B2
- Document ID: US7611083B2
- Status: Granted
- Kind: B2
- Application number: 11/709,894
- Filed: 2007-02-23
- Published: 2008-01-10
- Granted: 2009-11-03
- Earliest claimed: 2006-06-06
- Inventors: Jian Zhang
- Web page: https://patentgrep.com/patent/US7611083B2

## CPC

- B02C 18/0007: {specially adapted for disintegrating documents}
- B02C 2018/0015: {for disintegrating CDs, DVDs and/or credit cards}
- B02C 2018/0023: {Switching devices}
- B02C 2018/0046: {Shape or construction of frames, housings or casings}
- B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02})

## Abstract

A shredder feeder includes a pair of rotary blade rollers, an insertion assembly including an insertion slot, a spring biased raised safety panel enclosing the insertion slot, a safety switch, an emergency indicator, and a feeding and removal selection switch. In one operation in response to winding an object other than documents, CDs, and credit cards into the insertion slot or clogging, pressing the safety panel will switch the feeding and removal selection to a removal mode for removing the object, and disable the blade rollers in response to the removal. Alternatively, pressing the safety panel will switch the safety switch to disable the blade rollers and enable the emergency indicator for informing a user to switch the feeding and removal selection switch to the removal mode. Further, pressing the safety panel will disable the blade rollers in response to no object in the insertion slot.

## Claims

### Claim 1

A feeding system of a shredder including a housing, a pair of rotary blade rollers in the housing, a safety switch on the housing, and a shred reservoir under the blade rollers, comprising:
an insertion slot on the housing and aligned with the blade rollers;
a raised safety panel enclosing the insertion slot and above the safety switch;
two resilient members each biased between one side of the safety panel and the housing;
an emergency indicator spaced from the safety panel; and
a feeding and removal selection switch on the housing,
whereby in response to either clogging or winding an object other than documents, CDs, and credit cards into the insertion slot, pressing the safety panel will switch the feeding and removal selection to a removal mode for removing the object, and disable the blade rollers in response to the removal.

### Claim 2 (depends on 1)

The feeding system of claim 1, wherein the safety panel is adapted to press to switch the safety switch to an off state for disabling the blade rollers and enabling the emergency indicator for informing a user to switch the feeding and removal selection switch to the removal mode.

### Claim 3 (depends on 1)

The feeding system of claim 1, wherein the safety panel is adapted to press to disable the blade rollers in response to no object in the insertion slot.

### Claim 4

A feeding system of a shredder including a housing, a pair of rotary blade rollers in the housing, a safety switch on the housing, and a shred reservoir under the blade rollers, comprising:
an insertion assembly on the housing and aligned with the blade rollers, the insertion assembly including a first insertion slot for documents, a second insertion slot for credit cards, and a third insertion slot for CDs;
a raised safety panel enclosing the insertion slot and above the safety switch;
two resilient members each biased between one side of the safety panel and the housing;
an emergency indicator spaced from the safety panel; and
a feeding and removal selection switch on the housing,
whereby in response to either clogging or winding an object other than documents, CDs, and credit cards into the insertion assembly, pressing the safety panel will switch the feeding and removal selection to a removal mode for removing the object, and disable the blade rollers in response to the removal.

### Claim 5 (depends on 4)

The feeding system of claim 4, wherein the safety panel is adapted to press to switch the safety switch to an off state for disabling the blade rollers and enabling the emergency indicator for informing a user to switch the feeding and removal selection switch to the removal mode.

### Claim 6 (depends on 4)

The feeding system of claim 4, wherein the safety panel is adapted to press to disable the blade rollers in response to no object in the insertion slot.