Variable airflow hair treatment device
US4232454A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1979 |
| Grant date | Nov 11, 1980 |
| Priority date | — |
| Expiry date | Jun 14, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA45D20/122
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
There is disclosed a new and improved hair treatment device which comprises a fan for blowing air out of the device against a person's hair, a heater for heating the air before it is blown out of the device, and a means to control the airflow velocity which means is located at the forward end of the conduit for the heated air. Specifically, the airflow velocity control means is a pair of hinged trap doors disposed within the air conduit which are adjustable with infinite variability between the maximum opening capability of the air outlet in the hair treatment device and the minimum opening. The preferred means for adjusting the opening between the trap doors is a knob disposed on the outside of the air conduit portion of the device which is in operative relationship with a screw in operative relationship with the trap doors. The screw has two oppositely threaded portions, one portion haing a right-hand thread and the other portion having a left-hand thread and is inserted in both the trap doors each of which have an opening containing female threads adapted to engage a threaded portion of the adjustment screw. One trap door engages the left-hand thread and the other trap door enga…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.