Kickback reducing chain link

Patent metadata

Field	Value
Publication number	US-9561600-B2
Application number	US-201113979445-A
Country	US
Kind code	B2
Filing date	Jan 13, 2011
Priority date	Jan 13, 2011
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A cutting chain ( 100 ) moving in a cutting direction ( 120 ) is disclosed in the present invention. The cutting chain ( 100 ) includes a cutting link ( 106 ), which further includes a cutting portion ( 120 ), a depth gauge ( 118 ) and a space ( 122 ) between the cutting portion ( 120 ) and the depth gauge ( 118 ). The cutting chain ( 100 ) further includes a bumper drive link ( 104 ) which is pivotally connected to the cutting link ( 106 ) and immediately precedes the cutting link ( 106 ) in the cutting direction ( 124 ). The bumper drive link ( 104 ) further includes a tail ( 204 ) and a body ( 202 ). The tail ( 204 ) of the bumper drive link ( 104 ) further includes a bent portion ( 206 ) and a straight portion ( 208 ). Further, the bent portion ( 206 ) is oriented in a substantially perpendicular direction relative to a plane (P) of the body ( 202 ) of the bumper drive link ( 104 ). Moreover, the bent portion ( 206 ) of the tail ( 204 ) extends into the space ( 122 ) between the cutting portion ( 120 ) and the depth gauge ( 118 ) of the cutting link ( 106 ).

First claim

The invention claimed is:

1. A cutting chain movable in a cutting direction over a guide bar, the guide bar having a straight portion and a nose portion, wherein the cutting chain comprises:
at least one cutting link comprising a cutting portion, a depth gauge, and a space between the cutting portion and the depth gauge; and
at least one bumper drive link immediately preceding the cutting link in the cutting direction and pivotally connected to the cutting link, wherein the bumper drive link comprises a tail and a body,
wherein the tail of the bumper drive link comprises a bent portion, a straight portion, and a free space, the bent portion, the straight portion, and the free space of the tail being located on a top end of the bumper drive link,
wherein the bent portion is oriented substantially perpendicular relative to a plane of the body of the bumper drive link;
wherein the bent portion extends into the space between the cutting portion and the depth gauge of the cutting link;
wherein the free space is provided between the bent portion and the straight portion of the tail, an outer most edge of the bent portion being inwardly located in relation to an outer most edge of the depth gauge relative to the guide bar while the cutting chain traverses the straight portion of the guide bar; and
wherein the free space is substantially covered by the depth gauge of the cutting link while traversing the nose portion of the guide bar.

2. The cutting chain according to claim 1 , wherein a height of the bent portion of the bumper drive link is lower than a height of the straight portion.

3. The cutting chain according to claim 1 , wherein when the bent portion of the bumper drive link traverses the straight portion of the guide bar, the bent portion of the bumper drive link remains below the depth gauge of the cutting link.

4. The cutting chain according to claim 1 , wherein when the bent portion of the bumper drive link traverses the nose portion of the guide bar, the bent portion of the bumper drive link aligns with the depth gauge to form a substantially continuous edge.

5. The cutting chain according to claim 1 , wherein when the straight portion of the bumper drive link traverses the nose portion of the guide bar, the straight portion of the bumper drive link aligns with the depth gauge of the cutting link.

6. The cutting chain according to claim 1 , wherein when the bent portion of the bumper drive link traverses the nose portion of the guide bar, the bent portion extends above the cutting portion of the cutting link.

7. A bumper drive link for a cutting chain movable in a cutting direction over a guide bar, the guide bar having a straight portion and a nose portion, the bumper drive link comprising,
a body having a plane; and
a tail of the bumper drive link, comprising a bent portion, a straight portion, and a free space, the bent portion, the straight portion, and the free space of the tail being located on a top end of the bumper drive link;
wherein the bent portion is oriented substantially perpendicular relative to the plane of the body of the bumper drive link and fits to extend into a space between a cutting portion and a depth gauge of a cutting link;
wherein the free space is provided between the bent portion and the straight portion of the tail, an outer most edge of the bent portion being inwardly located in relation to an outer most edge of the depth gauge relative to the guide bar while the cutting chain traverses the straight portion of the guide bar; and
wherein the free space is substantially covered by the depth gauge of the cutting link while traversing the nose portion of the guide bar.

8. The bumper drive link for a cutting chain of claim 7 , wherein a height of the bent portion is lower then a height of the straight portion.

9. The cutting chain according to claim 7 , wherein the cutting chain is adapted to be used with a chainsaw.

10. The cutting chain according to claim 1 , wherein a length of the free space is about 1.2 mm.

11. The cutting chain according to claim 1 , wherein when the bent portion of the bumper drive link traverses the nose portion of the guide bar, a relative spacing between the bumper drive link and the cutting link is such that the bent portion of the bumper drive link aligns with the depth gauge of the cutting link.

12. The bumper drive link for a cutting chain of claim 7 , wherein a length of the free space is about 1.2 mm.

13. The bumper drive link for a cutting chain of claim 7 , wherein when the bent portion of the bumper drive link traverses the nose portion of the guide bar, a relative spacing between the bumper drive link and the cutting link is such that the bent portion of the bumper drive link aligns with the depth gauge of the cutting link.

14. The bumper drive link for a cutting chain of claim 7 , wherein a juncture section of the bumper drive link connects the bent portion of the bumper drive link to the body of the bumper drive link.

Assignees

• Dröβler Christian
• Maag Markus
• Husqvarna Ab

Inventors

• Dröβler Christian
• Maag Markus

Classifications

• B27B33/147

  with incorporated lubricating means · CPC title

• Y10T83/925

  Having noncutting depth gauge · CPC title

• B27B33/141 Primary

  with means to control the depth of cut · CPC title

• B27B33/14

  Saw chains {(saw chains for slotting or mortising devices B27F5/08)} · CPC title