US 4,052,713 AGranted

Universal snap mounting for disposable chart pens

AssigneeWaterbury Scroll Pen Corporation

InventorsWilliam F. Lytle, Thomas E. Cathcart, Jr.

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Abstract

A universal, snap-on pen cartridge for attachment to the movable pen arm of a chart recorder, comprising a pen body having an ink reservoir and stylus connected therewith and adapted for engagement with a chart carried by the recorder, together with a resilient spring clip engageable with the body and adapted to clamp against an end portion of the recorder pen arm. The said end portion is substantially flat, and is held against a corresponding flat surface of the pen body. A raised portion on the body engages the end of the pen arm and constitutes a positioning device which supplements the clip action. The arrangement is such that assembly of the pen body to the arm can be quickly and easily effected, while at the same time there is provided a connection which is firm and free of undesirable looseness or slippage.

Claims8

Dependent claims

A universal, snap-on pen cartridge device for attachment to the moving pen arm of chart recorders, comprising in combination:

a. pen body containing an ink reservoir and a stylus connected therewith, adapted for engagement with the paper carried by the recorder,
b. said body having a raised portion adjacent the stylus, and having a substantially flat surface against which a corresponding flat part of the recorder arm can bear,
c. a resilient metal clip attachable to said body, said clip having a generally U-shaped configuration, and including a pair of leg portions and a connecting web portion,
d. means on said body located to be spaced from said body raised portion, defining a pair of oppositely located shoulders,
e. detent means on the leg portions of said clip respectively for engagement with said opposite shoulders to thereby hold the clip captive on the body,
f. said raised portion of the body being adapted for engagement with a cooperable end portion of the recorder pen arm to constitute a positioning device therewith.

3 more elements

Dependencies are inferred from the claim text.