# US 9,751,202 B2 · Assisted opening multitool method and apparatus

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- Number: US 9,751,202 B2
- Document ID: US9751202B2
- Status: Granted
- Kind: B2
- Application number: 13/971,812
- Filed: 2013-08-20
- Published: 2014-07-17
- Granted: 2017-09-05
- Earliest claimed: 2009-01-29
- Applicants: Spencer Frazer
- Inventors: Spencer Frazer
- Web page: https://patentgrep.com/patent/US9751202B2

## CPC

- B25F 1/04: wherein the elements are brought into working positions by a pivoting or sliding movement
- B25F 1/003: {of pliers'-, scissors'- or wrench-type with at least one movable jaw (B25F1/006 takes precedence)}
- B25B 7/00: Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools (implements for fastening, connecting, or tensioning wire or strip B25B25/00; adapted for other fitting or separating purposes B25B27/00; for marking animals A01K11/00; dentists' forceps A61C3/00; bending wire eyes B21F1/06; hand-held metal-shearing or metal-cutting devices B23D29/00; hand cutting tools B26B; for punching or perforating B26F1/36; devices for securing ends of binding material in bundling machines B65B13/24; specially designed for watch-making or comparable work G04D1/00)
- B25B 7/02: Jaws
- B25F: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR {(machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass B23P23/00 and subgroups)}
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING

## Abstract

An assisted opening multitool handle comprising a handle housing having a longitudinal axis and a lateral axis, the handle housing having first and second longitudinal regions, the handle housing having an interior surface defining a channel region. The assisted opening multitool handle further comprises a tool member pivotally attached to the handle housing and operatively configured to be positioned in a closed orientation within the channel region and configured to rotate in an opening direction to an open orientation.

## Claims

### Claim 1

An assisted opening multitool comprising:
a first handle having a longitudinal axis and a lateral axis, the first handle having first and second longitudinal regions, the first handle having an interior surface defining a channel region,
a second handle having an interior surface defining a channel region,
a tool member pivotally attached to the first handle and operatively configured to be positioned in a closed orientation within the channel region and configured to rotate in an opening direction to an open orientation,
an assisted opening system comprising a spring system operatively attached to the tool member where the spring system provides rotational resistance of the tool member for a first portion of rotation of the tool member from the closed orientation to the open orientation, and the spring system provides positive torque for a second portion of rotation between the closed orientation and the open orientation where the second portion of rotation is after the first portion of rotation from the closed orientation to the open orientation of the tool member with respect to the first handle,
where the assisted opening system comprises a release lever comprising an interface portion positioned on a lateral region of the first handle, and the release lever comprises a cam engagement portion to engage a tool cam surface of the tool member, the tool cam surface comprising a resistance cam surface portion where contact between the cam engagement portion of the release lever and the resistance cam surface portion provides a torque upon the tool member in a closing direction when the tool member is positioned at the first portion of rotation with respect to the first handle, and
where the tool cam surface comprises a cam opening portion having a substantially constant radius at the second portion of rotation of the tool member at a point of engagement of the cam engagement portion of the release lever and the cam opening portion of the tool cam surface.