# US 8,540,450 B1 · Pen cap attachment mechanism

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- Number: US 8,540,450 B1
- Document ID: US8540450B1
- Status: Granted
- Kind: B1
- Application number: 12/944,255
- Filed: 2010-11-11
- Granted: 2013-09-24
- Earliest claimed: 2009-11-11
- Applicants: Matthew Conable
- Inventors: Matthew Conable
- Web page: https://patentgrep.com/patent/US8540450B1

## CPC

- B43K 23/12: for pens {(caps co-operating with retractable nibs B43K5/165)}
- B43K 5/005: {Pen barrels}
- B43K 5/02: Ink reservoirs
- B43K 7/005: {Pen barrels}
- B43K 7/02: Ink reservoirs; Ink cartridges (B43K7/01 takes precedence)
- B43K 23/008: Holders comprising finger grips (B43K23/004, B43K23/012 take precedence)
- B43K 23/126: {with clips}
- B43K 23/128: {with spring means}
- B43K 25/022: {attached to a pen cap}
- B43K: IMPLEMENTS FOR WRITING OR DRAWING (containers, casings or accessories for cosmetic substances, e.g. shaving soap, lipstick, make-up A45D34/00, A45D40/00)

## Abstract

In general, this disclosure relates to a pen housing mechanism, comprising at least one locking collar provided on a pen body configured to receive a pen cap, specifically a pen cap having a plurality of inset “balls” that engage channels within the locking collar. In one form, the “balls” are fit into voids drilled or otherwise provided in a portion of the pen cap and press fit, or otherwise attached, thereto. In one form, a compression spring is provided, which biases the “balls” into a locking portion of the channel.

## Claims

### Claim 1

A writing implement assembly comprising:
a. a pen body having a writing end, and a longitudinal axis;
b. a pen cap having an open end operatively configured to fit over a portion of the writing end of the pen body;
c. a plurality of voids disposed through the open end of the pen cap;
d. a plurality of rigid balls fixedly set within the voids disposed through the open end of the pen cap wherein the rigid balls extend inward of the pen cap and outward of the pen cap;
e. a plurality of receiving channels provided on the writing end of the pen body; and
f. wherein the receiving channels are operatively configured to receive a portion of the balls to maintain the pen cap upon the pen body.

### Claim 2 (depends on 1)

The writing implement assembly of claim 1 wherein the balls are spherical.

### Claim 3 (depends on 1)

The writing implement assembly of claim 1 wherein the receiving channels are non-linear from a side view.

### Claim 4 (depends on 3)

The writing implement assembly of claim 3 wherein the receiving channels are substantially c-shaped from a side view.

### Claim 5 (depends on 1)

The writing implement assembly of claim 1 wherein the balls are press fit into the voids disposed thorough the open end of the pen cap.

### Claim 6 (depends on 1)

The writing implement assembly of claim 1 wherein the writing end of the pen body comprises a fountain pen writing tip.

### Claim 7 (depends on 1)

The writing implement assembly of claim 1 wherein the writing end of the pen body comprises a rolling style writing tip.

### Claim 8 (depends on 1)

The writing implement assembly of claim 1 wherein the pen cap further comprises
a. a compression spring operatively configured to engage the writing end of the pen body and the compression spring is operatively configured to bias the pen cap away from the pen body along the longitudinal axis of the pen body;
b. wherein each of the receiving channels comprise at least one entry portion and at least one locking portion; and
c. wherein the compression spring biases the balls within the locking portion of the receiving channels.

### Claim 9 (depends on 1)

The writing implement assembly of claim 1 further comprising:
a. a cap receiver portion provided on the pen body at the longitudinal end opposite the writing end;
b. a plurality of receiving channels provided on the cap receiver portion of the pen body; and
c. wherein the receiving channels on the cap receiver portion of the pen body are operatively configured to receive a portion of the balls of the pen cap.

### Claim 10 (depends on 3)

The writing implement assembly of claim 3 wherein the receiving channels are substantially y-shaped from a side view.