Patent · US Expired

Electromagnetically operated driving tool with air damper

US4611742A · kind A · utility

12Cited by

8References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Werner Rieker · Waldenbuch, DE
Fritz Schadlich · Echterdingen, DE

Key dates

Filing date	Oct 3, 1985
Grant date	Sep 16, 1986
Priority date	—
Expiry date	Oct 3, 2005

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25C5/15
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

In an electromagnetically operated driving tool, in which a cup-shaped plunger carrying a driver blade is axially slidable in a solenoid, an air damper, combined with a check valve, is provided to damp the plunger during its backward movement to an inoperative position. A hollow cylinder positioned in the plunger is vented through an opening in a housing of the tool and has an interior which is closed at its end with a liftable valve flap. A throttle gap is formed between the plunger and the cylinder, which is adjustable by a piston movable in the cylinder which is made of elastic plastics and is elastically expandable to vary the throttle gap.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.