U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Icon_funbox Famous Patents

In 1879, Auguste Bartholdi received design patent number 11,023 titled "Design for a Statue". It was for the Statue of Liberty.

Newsletter  PatentStorm News

Make the Most of Our Site

See this month's Top Inventors and Most Cited Patents.

Stay on top of the latest innovations by subscribing to an RSS feed.

Registered users: Manage your profile.

 

Class 400/556.2 - Via toothed ring and locking member(s)


Subclass of Class 400 - Typewriting machines
Definition: Subject matter wherein the ratchet* wheel and the
No. of patents: 5
Last issue date: 12/01/1987


NumberTitleIssue Date
4710046Platen clutch mechanism
A printer having a platen mounted on a shaft rotatably and a line indexing driving gear with a releasable clutch mechanism which couples selectively the platen and driving gear for line-by-line indexing or manual indexing of the platen. The clutch mechani...
12/01/1987
4456395Platen knob device of typewriter
This invention is a platen knob device in a typewriter for releasing a platen of the typewriter from a platen pitch feed mechanism and changing the platen over to a continuous feed. This platen knob device includes a platen variable fixed onto a platen sh...
06/26/1984
4247212Printer flaten clutch
A printer having a platen mounted on a platen shaft and a line indexing driving gear includes releasable coupling means selectively coupling the platen shaft and driving gear for printer controlled or manual indexing of the platen. It includes an external...
01/27/1981
4105106Typewriter platen clutch mechanism
A normally engaged toothed cone clutch mechanism to allow disengagement of the platen of a typwriter from a line indexing ratchet wheel to enable rotation of the platen independently of the ratchet wheel includes a clutch member and a connection between t...
08/08/1978
4064985Selectable dual ratchet feed for a printer platen
A line feed ratchet arrangement is disclosed which allows selectability between two different line feeds such as the 5 1/3 lines per inch and six lines per inch and utilizes a drive pawl arrangement having two pawls driven identically. The drive ratchets ...
12/27/1977
 
Sign InRegister
Username  
Password   
forgot password?