# US 12,108,925 B2 · Apparatus for compensating pressure surges

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- Number: US 12,108,925 B2
- Document ID: US12108925B2
- Status: Granted
- Kind: B2
- Application number: 17/632,716
- Filed: 2020-07-24
- Published: 2022-09-08
- Granted: 2024-10-08
- Earliest claimed: 2019-08-05
- Assignees: Hilti Aktiengesellschaft
- Applicants: Hilti Aktiengesellschaft
- Inventors: Anton Kidess
- Web page: https://patentgrep.com/patent/US12108925B2

## CPC

- A47L 9/24: Hoses {or pipes}; Hose {or pipe} couplings (hoses or hose joints in general F16L)
- A47L 9/248: {Parts, details or accessories of hoses or pipes (nozzles A47L9/02)}
- A47L 7/0095: {Suction cleaners or attachments adapted to collect dust or waste from power tools}
- A47L 9/0072: {Mechanical means for controlling the suction or for effecting pulsating action}
- F16L 55/04: Devices damping pulsations or vibrations in fluids {(F16L55/02 takes precedence)}
- A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

An apparatus for a vacuum cleaner for compensating air pressure surges, where a first air flow is flowable in a first flow direction through the apparatus and a second air flow is flowable in a second flow direction through the apparatus, includes a main body having a first cross-sectional area of flow and a flow resistance element. A free end of the flow resistance element projects from the main body and produces a second cross-sectional area of flow. The first cross-sectional area of flow is larger than the second cross-sectional area of flow such that the second air flow flowable in the second flow direction is reduced.

## Claims

### Claim 1

An apparatus for a vacuum cleaner for compensating air pressure surges, comprising:
a main body having a first cross-sectional area of flow, wherein in a vacuum cleaning mode a first air flow is flowable in a first flow direction through the first cross-sectional area and through an entirety of the apparatus; and
a flow resistance element, wherein a free end of the flow resistance element projects from the main body and has a second cross-sectional area of flow, wherein the first cross-sectional area of flow is larger than the second cross-sectional area of flow, and wherein in a filter cleaning mode a second air flow is flowable in the second flow direction through the second cross-sectional area and through the entirety of the apparatus.

### Claim 2 (depends on 1)

The apparatus as claimed in claim 1, wherein the main body is configured in a form of a cylinder and wherein the flow resistance element is configured in a form of a funnel such that a stagnation volume for at least some of the second air flow is formed between an outer lateral surface of the flow resistance element and an inner lateral surface of the main body.

### Claim 3

A device, comprising:
an apparatus for a vacuum cleaner for compensating air pressure surges, wherein a first air flow is flowable in a first flow direction through the apparatus and a second air flow is flowable in a second flow direction through the apparatus, wherein the apparatus includes:
a main body having a first cross-sectional area of flow; and
a flow resistance element, wherein a free end of the flow resistance element projects from the main body and produces a second cross-sectional area of flow and wherein the first cross-sectional area of flow is larger than the second cross-sectional area of flow such that the second air flow flowable in the second flow direction is reduced; and
a vacuum cleaner hose couplable to the apparatus.

### Claim 4

A device, comprising:
an apparatus for a vacuum cleaner for compensating air pressure surges, wherein a first air flow is flowable in a first flow direction through the apparatus and a second air flow is flowable in a second flow direction through the apparatus, wherein the apparatus includes:
a main body having a first cross-sectional area of flow; and
a flow resistance element, wherein a free end of the flow resistance element projects from the main body and produces a second cross-sectional area of flow and wherein the first cross-sectional area of flow is larger than the second cross-sectional area of flow such that the second air flow flowable in the second flow direction is reduced; and
a vacuum cleaner couplable to the apparatus.