(11) EP 3 800 011 A1 (12) EUROPEAN PATENT APPLICATION (19) (57) An air duster structure that is configured to jet compressed air out of a nozzle, includes a flow amount adjustment mechanism which is configured to adjust an amount of air jetted out of the nozzle. The flow amount adjustment mechanism includes: a pipe line for circulat- ing air;a valve memberdisposed inside the pipeline and being movable; and a throttle portion configured to grad- ually change an area of a flow channel in which air cir- culates,with a movementofthe valve member,to control aflow amountoftheairin the pipeline.The throttle portion isstructured so asto increase the areaofthe flow channel at an accelerated rate when the valve member moves in a direction that opens the pipe line. FIG. 1 Printed by Jouve, 75001 PARIS (FR) EP 800 011 A1 (43) Date of publication:  07.04.2021 Bulletin 2021/14 (21) Application number:  20201940.2 (22) Date of filing:  22.12.2017 (51) Int Cl.: B25C 1/04 (2006.01) (84) Designated Contracting States:  AL AT BE BG CH CY CZ DE DK EE ES FI FR GB  GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO  PL PT RO RS SE SI SK SM TR (30) Priority: 28.12.2016 JP 2016256590 (62) Document number(s) of the earlier application(s) in  accordance with Art. 76 EPC:  19166133.9 / 3 549 721 17210101.6 / 3 348 356 (71) Applicant:  Max Co., Ltd. Tokyo 103-8502 (JP) (72) Inventor:  KAZUYA, Mochizuki Tokyo, 103-8502 (JP) (74) Representative:  Samson & PartnerPatentanwälte  mbB Widenmayerstraße 6 80538 München (DE) Remarks: This application was filed on 15-10-2020 as a  divisional application to the application mentioned  under INID code 62. (54) AIR DUSTER STRUCTURE AND DRIVING TOOL