Knife with replaceable blade

Patent metadata

Field	Value
Publication number	US-9808942-B2
Application number	US-201414370008-A
Country	US
Kind code	B2
Filing date	Mar 12, 2014
Priority date	Mar 12, 2014
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

The present invention publishes a knife with a replaceable blade, comprising a housing, a cover arranged on the housing and a blade carrier arranged between the housing and the cover, characterized in that, a blade which can move between an extended position and a retracted position is installed on the blade carrier, and a blade cartridge carrier is arrange around the periphery of a position adjacent to the retracted position of the blade, the blade cartridge carrier is provided with an internal space of a blade shape to place spare blades. Wherein, the cover can be connected with the housing in an open type to fix the blade carrier between the cover and the housing.

First claim

The invention claimed is:

1. A knife with a replaceable blade, comprising a housing,
a cover arranged on the housing and a blade carrier arranged between the housing and the cover and slidable relative to the housing to move a blade between an extended position and a retracted position, and a blade cartridge carrier arranged adjacent and parallel to the blade carrier having a perimeter extending around a periphery of a position adjacent to the retracted position of the blade, the blade cartridge carrier having an internal space to receive spare blades,
wherein the cover can be connected with the housing in an open type to fix the blade carrier between the cover and the housing;
a switch mechanism is arranged on the cover to control opening and closing of the cover and the housing, the switch mechanism comprising a trigger member located at an outside of the cover and a contacting member connected with the trigger member;
a through hole is arranged on the cover, and the trigger member is arranged in an interior of the through hole;
the trigger member comprising one pushing face and an axis pin, the pushing face capable of rotating around the axis pin, a front portion of the pushing face is provided with a blocking portion and a stopping member is arranged in the through hole of the cover; and when no force is exerted on the pushing face, the blocking portion is located at a position of the stopping member and the stopping member stops forward movement of the trigger member; and actuating the pushing face to overcome an elasticity of a pressure spring permits the pushing face to rotate around the axis pin and the blocking portion to rotate to a position above the stopping member to allow the trigger member to move forward.

2. The knife with a replaceable blade as claimed in claim 1 , characterized in that, the housing and the cover are hinged together through a pivot.

3. The knife with a replaceable blade as claimed in claim 1 , characterized in that, the housing is provided with a front portion and a rear portion, the blade carrier is arranged on the front portion to install the blade, the rear portion is set with a receiver to place the spare blades, and the cover encloses the blade carrier and the receiver into the housing.

4. The knife with a replaceable blade as claimed in claim 3 , characterized in that, the blade carrier located on the front portion of the housing comprises a blade frame that can move along the housing to enable the blade installed in the blade frame to transform from a position out of the housing to a position received in the housing.

5. The knife with a replaceable blade as claimed in claim 4 , characterized in that, the blade carrier further comprises a sliding controlling member, and the sliding controlling member comprises a handheld portion located on an exterior of the housing and a connection portion extended from a bottom of the handheld portion to connect with the blade frame.

6. The knife with a replaceable blade as claimed in claim 5 , characterized in that, the connection portion divides into two portions, a top portion and a bottom portion, the bottom portion is provided with lateral protuberances towards the direction of the housing, a spring is arranged between a bottom of the bottom portion and a contact surface of the blade frame, the housing is provided with spaced recesses within the stroke range of the sliding controlling member, and the lateral protuberances are located in the recesses.

7. The knife with a replaceable blade as claimed in claim 5 , characterized in that, the blade is provided with a locking part, the locking part is a notch or a through hole on the back of the blade, and the blade is detachably fixed on the blade frame via the locking part.

8. The knife with a replaceable blade as claimed in claim 7 , characterized in that, the blade carrier further comprises a blade lock set at the other side of the blame frame versus the blade, a strike for clamping into the internal of the locking part of the blade and a pushing part for receiving external force to make the blade lock away from the direction of the blade are arranged on the blade lock.

9. The knife with a replaceable blade as claimed in claim 8 , characterized in that, the housing is provided with an unlocking member at a position corresponding to the pushing part of the blade lock, and the unlocking member comprises a spring to exert force to the pushing part.

10. The knife with a replaceable blade as claimed in claim 9 , characterized in that, the blade carrier further comprises a blade loading member which is a magnetic element arranged on the blade flame.

11. The knife with a replaceable blade as claimed in claim 10 , characterized in that, a leaf spring is arranged at an inner side of the cover, and the position of the leaf spring corresponds to the position of the spare blades stored in an inner space of the blade cartridge carrier.

12. The knife with a replaceable blade as claimed in claim 1 , characterized in that, when the switch mechanism is at a closed state, the contacting member is coordinately fixed with the housing, and when the switch mechanism is at an open state, the contacting member is separated with the housing, thereby the cover is separated with the housing.

13. The knife with a replaceable blade as claimed in claim 12 , characterized in that, the switch mechanism further comprises a switching spring, and the switching spring is arranged between a front internal wall of the through hole and the trigger member.

14. The knife with a replaceable blade as claimed in claim 13 , characterized in that, the contacting member is a hook member which extends from a bottom of the trigger member, a side slot is arranged at a position corresponding to the housing, and the side slot can accommodate and secure a hook portion of the hook member.

15. The knife with a replaceable blade as claimed in claim 14 , characterized in that, the trigger member further comprises one slot with two lateral walls, the two lateral walls respectively have two holes, an axis pin goes through a center of the hole, a single pressure spring which is located between the slot and the pushing face is installed on the axis pin, an upper surface of the pushing face is used for pushing by hand, a lateral portion of the pushing face extends downward from two sides of the pushing face and has two ears, the ears respectively have cavities through which the axis pin can pass, thus the pushing face is installed on a top portion of the slot via the axis pin, the blocking portion extends downward along the ears from a front edge of the pushing face, the stopping member is located above the switch spring.

16. The knife with a replaceable blade as claimed in claim 15 , characterized in that, the switch mechanism further comprises a fixing member by which the trigger member and the contacting member are fixed on the cover in a vertical direction.

17. The knife with a replaceable blade as claimed in claim 16 , characterized in that, an auxiliary spring is further arranged between the cover and the housing.

18. The knife with a replaceable blade as claimed in claim 17 , characterized in that, a receiver of the housing further comprises an elastic holder which is installed on the housing beside the receiver, and an elastic end of the elastic holder extends to a top of the receiver, thereby the spare blades in the receiver can be fixed into the receiver.

19. The knife with a replaceable blade as claimed in claim 1 , characterized in that, a fixed state and a separated state o

Assignees

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

Inventors

• Wang Weiyi

Classifications

• B26B5/00

  Hand knives with one or more detachable blades · CPC title

• B26B5/001 Primary

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