Retractable cutting tool

Patent metadata

Field	Value
Publication number	US-10994429-B2
Application number	US-201715729072-A
Country	US
Kind code	B2
Filing date	Oct 10, 2017
Priority date	Jul 19, 2017
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

The present invention provides a retractable cutting tool, which includes: a cutting tool housing, the interior thereof forming a cavity; a blade exit portal, penetrating through the cutting tool housing and communicating with the cavity; a blade holder, moved or locked in the cutting tool housing; a blade, mounted to the blade holder and disposed opposite the blade exit portal; when the blade holder is moved, the front end of the blade protrudes out of the cutting tool housing or retracts into the cutting tool housing through the blade exit portal; a blade holder moving device, for moving the blade holder in the cutting tool housing; and a protrusion length control device, for controlling the protrusion length of the blade outside the cutting tool housing.

First claim

The invention claimed is:

1. A retractable cutting tool, comprising:
a cutting tool housing, an interior of which forms a cavity;
a blade exit portal penetrating through a front end of the cutting tool housing and communicating with the cavity;
a blade holder moved or locked in the cutting tool housing;
a blade assembled to the blade holder; when the blade holder is moved, a front end of the blade protrudes out of the cutting tool housing or retracts into the cutting tool housing through the blade exit portal;
a first device for moving the blade holder in the cutting tool housing; and
a second device for controlling a protrusion length of the blade outside the cutting tool housing, wherein the cutting tool housing includes a first housing portion, wherein the first device includes a driving member, the driving member including a first driving plate and a driving base plate, and
wherein the second device comprises:
a locking sheet, sliding in a slide groove of an inner sidewall of the first housing portion,
a stop piece, protruding from a surface of the locking sheet towards the driving member, and
at least one stop position engaging opening, arranged at an edge of the first driving plate of the driving member;
when the driving base plate of the driving member is stressed, the stop piece can slide to any one of the at least one stop position engaging opening;

a stop position hole, penetrating through a sidewall of the first housing portion and disposed opposite the locking sheet;
wherein the second device further comprises:
a stop position lever, protruding from a surface of the locking sheet towards the first housing portion and sliding in the stop position hole, and
a lock button, arranged outside the first housing portion and connected to the stop position lever; and

a stop position mark, provided at an outer surface of the first housing portion and corresponding to the stop position hole.

2. The retractable cutting tool according to claim 1 , wherein the first housing portion is provided with a first housing latch slot and the cutting tool housing further comprises:
a second housing portion, provided with a second housing latch slot, the second housing portion disposed opposite the first housing portion; and
a cap, detachably connected to the first housing portion and/or the second housing portion;
wherein the cap comprises:
a first cap plate, provided with a protruding first snap latch at a bottom thereof that is snap-fitted to the first housing latch slot; and
a second cap plate, disposed opposite the first cap plate and provided with a protruding second snap latch at a bottom thereof that is snap-fitted to the second housing latch slot.

3. The retractable cutting tool according to claim 1 , wherein the first device comprises:
two parallel rectilinear guide rails protruding from one side surface of the blade holder;
a guide rail gap formed between the two guide rails; and
a housing sliding block, protruding from an inner sidewall of the cutting tool housing towards the blade holder and snapped into the guide rail gap; when the blade holder is moved, the housing sliding block slides with respect to the two guide rails.

4. The retractable cutting tool according to claim 1 , wherein one end of the driving member is hinged to the cutting tool housing, and the first driving plate is provided with a first driving plate through hole, and the driving member further comprises:
a second driving plate provided with a second driving plate through hole, disposed opposite the first driving plate through hole;
a driving shaft pin, one end of which is slidably mounted into the first driving plate through hole, and another end of which is slidably mounted into the second driving plate through hole; and wherein
the driving base plate connecting the first driving plate and the second driving plate.

5. The retractable cutting tool according to claim 4 , wherein the first device comprises:
a first lever, one end of which is hinged to the cutting tool housing, and another end of which is rotatably mounted to the driving shaft pin;
a second lever, one end of which is hinged to the blade holder, and another end of which is rotatably mounted to the driving shaft pin; and
an elastic member, one end of which is connected to the cutting tool housing, and another end of which is connected to the blade holder.

6. The retractable cutting tool according to claim 5 , wherein
when the driving base plate is stressed, the driving shaft pin is pushed by the first lever to slide in the first driving plate through hole and the second driving plate through hole; the blade holder is pushed by the second lever to move towards the blade exit portal, and the elastic member is elastically deformed; and the length of the blade extending outside the cutting tool housing is directly proportional to a distance by which the blade holder moves towards the blade exit portal; and
when the driving base plate is unstressed, the elastic member resiles to push the blade holder to move away from the blade exit portal.

7. The retractable cutting tool according to claim 1 , wherein when the blade holder is moved, the stop piece slides at a top of the first driving plate or in any one of the at least one stop position engaging opening; and the length of the blade extending outside the cutting tool housing is directly proportional to a distance by which the stop piece slides; and
when the blade holder is locked, the stop piece is selectively snap-fitted to any one of the at least one stop position engaging opening, or away from or tangent to the top of the first driving plate; the length of the blade extending outside the cutting tool housing corresponds to a position of the stop piece.

8. The retractable cutting tool according to claim 1 , wherein the stop piece comprises the following that are integrally formed:
a strip-shaped portion having a parallelogram cross-section;
a stop piece protruding portion, being at a bottom of the strip-shaped portion, two base angles of a cross-section of the stop piece protruding portion being rounded angles; and
an arch portion having an arch cross-section, the arch portion being a side of the strip-shaped portion;
wherein a slide groove is formed in the locking sheet.

9. The retractable cutting tool according to claim 1 , wherein the at least one stop position engaging opening comprises:
an engaging opening sidewall, arranged at one side of the stop position engaging opening;
an engaging opening protruding portion protruding from the other side of the stop position engaging opening;
an engaging opening lug, protruding from a bottom surface of the stop position engaging opening and provided between the engaging opening sidewall and the engaging opening protruding portion; and
an engaging opening slide groove, formed at the bottom surface of the stop position engaging opening and located at one side or both sides of the engaging opening lug;
or,
the at least one stop position engaging opening comprises:
an engaging opening sidewall, provided at one side of the stop position engaging opening;
an arc recess, arranged at the other side of the stop position engaging opening.

10. The retractable cutting tool according to claim 1 , further comprising:
a blade latch slot, arranged at an upper portion of the blade holder, whose shape corresponds to that of the blade;
a blade engaging opening, arranged at a ridge of the blade; and
a blade locking block, protruding from an inner surface of the blade latch slot, and snap-fitted to the blade engaging opening.

11. The retractable cutting tool according to claim 10 , wherein the blade latch slot comprises:

Assignees

• Hangzhou Great Star Ind Co Ltd
• Hangzhou Great Star Tools Co Ltd

Inventors

• Wang Weiyi

Classifications

• B26B5/003 Primary

  comprising retraction means for the blade or the blade holder · CPC title

• B26B5/001

  with blades being slid out of handle immediately prior to use · CPC title

• B26B1/08

  with sliding blade {(with detachable blades B26B5/001)} · CPC title