Cutting or sawing machine

Patent metadata

Field	Value
Publication number	US-9862120-B2
Application number	US-74763410-A
Country	US
Kind code	B2
Filing date	Dec 13, 2007
Priority date	Dec 13, 2007
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A preferred embodiment of a hand-operated flush cutting machine includes a front section with a first and a second disc shaped cutter blade which are rotary about an axis of rotation and mounted in the front end of an elongated tool carrier having the substantial shape of a flat bar. The tool carrier is mounted to a rear section of the machine. The rear section is provided with a number of components, including a motor for driving the cutter blades via a power transmission as well as handles and a control for operating the machine. The first, right hand side cutter blade has a first side, which does not face the second cutter blade. The first side defines a first plane which does not intersect any component in the front or rear sections.

First claim

The invention claimed is:

1. A hand-held, hand-operated, cutting or sawing machine comprising:
a front section and a rear section;
the front section includes at least a first, disc-shaped cutter blade, which is rotary about an axis of rotation, said first cutter blade having a peripheral edge portion which is the working part of the first cutter blade, said first cutter blade having a first side defining a first plane, and a second side defining a second plane,
said first cutter blade is rotatably mounted in a front end of an elongated tool carrier, said elongated tool carrier having a substantial shape of a flat bar having two opposite side walls which are parallel with said first and second sides of said first cutter blade,
said front end further comprising an upper front blade guard and a lower front blade guard;
a rear end of the elongated tool carrier is connected to said rear section of the machine at a location rearward of said first cutter blade,
said first cutter blade is provided on a first side of a center plane of the front section, said second side of said first cutter blade facing the tool carrier,
said rear section includes a motor that drives the first cutter blade via a power transmission, and said rear section further includes a housing, handles, and a control device trigger for operating the machine,
said first plane does not intersect any component, besides the first cutter blade, included in said front or rear sections,
a rear tool guard having a flush-cutting mode and a non-flush-cutting mode, and in the flush-cutting mode said first plane does not intersect the rear tool guard, but does intersect the rear tool guard in the non-flush-cutting mode,
wherein the rear tool guard is connected to a mid-section of the machine, and said rear tool guard includes a lateral part which optionally can be maintained intersected by said first plane or be withdrawn from the first plane and from the region outside of the first plane, and
wherein a lower end of the rear tool guard is pivotally connected to a bottom portion of a shield, and is displaceable in lateral directions by a rocker and a rocker lever on a rear side of said bottom portion of the shield.

2. Machine according to claim 1 , wherein the rear tool guard is arranged to be displaced in said lateral directions sideways between the flush-cutting mode and the non-flush-cutting mode.

3. Machine according to claim 1 , wherein a drive wheel half for rotatably supporting an optional, second disc-shaped, rotary cutter blade is provided on a second side of the center plane of the front section, said drive wheel half is provided with means for detachably securing said second disc-shaped cutter blade to said drive wheel half.

4. Machine according to claim 1 , wherein the length of said rear section and the length of said front section are approximately equal.

5. Machine according to claim 1 , wherein said handles include an elongated, longitudinal, rear handle near said first plane in a rear end of the machine's rear section and a transversal front handle near a front end of said rear section.

6. Machine according to claim 5 , wherein a center plane of said elongated rear handle is parallel to said first plane and the center plane of said elongated rear handle is located at a lateral distance from the center plane of the front section, the center plane of the front section being defined by a longitudinal center of the elongated tool carrier, and parallel to the first plane and the second plane, a rear end of the rear handle is located at a longitudinal distance from said axis of rotation of said first cutter blade, and wherein the ratio between said lateral distance and said longitudinal distance amounts to less than 1/10.

7. Machine according to claim 6 , wherein the ratio is less than 1/20.

8. Machine according to claim 1 , wherein said rear section includes at least one side member with a thickness extending in a lateral direction to said first plane.

9. Machine according to claim 8 , wherein said at least one side member has at least one flat side surface, the plane of which coincides with said first plane.

10. Machine according to claim 1 , wherein the power transmission includes a motor shaft, a driving belt, a driving pulley that drives the driving belt, an output shaft mounted to said driving pulley, and an angular gearing that connects said motor shaft to said output shaft, and wherein the axes of rotation of the motor shaft, the output shaft and the first cutter define a common plane.

11. Machine according to claim 10 , wherein the motor shaft extends in a longitudinal direction of the machine, and the angular gearing is a right-angular gearing.

12. Machine according to claim 10 , wherein a driving wheel half that supports the first cutter blade is provided at the front end of the elongated tool carrier, and wherein a driving belt tensioner is provided for tensioning the driving belt by moving the elongated tool carrier forwards, said belt tensioner including an eccentric provided rotary in a cavity on a right-hand, flush-cutting side of the machine.

13. Machine according to claim 1 , wherein said housing has a first side on the same side of said center plane of the front section as said first plane closely to said first plane, said first side of the housing facing said first plane, and said housing has a second side on the opposite side of said center plane.

14. Machine according to claim 1 , wherein the shield hinders sawdust or cuttings from hitting the rear section, the shield is provided in a mid-section between the front section and the rear section and is not intersected by said first plane.

15. Machine according to claim 14 , wherein the mid-section has a length in the longitudinal direction which is less than 5% of the total length of the machine.

16. Machine according to claim 1 , wherein a tool assembly is provided in said front section including two disc-shaped coaxial cutter blades, namely said first cutter blade on a first side of the center plane of the tool carrier and a second cutter blade on the opposite, second side of said center plane, and that any plane defined by the sides of said second cutter blade intersects at least one component included in the rear section of the machine.

Assignees

• Hellberg Tommy
• Husqvarna Ab

Inventors

• Hellberg Tommy

Classifications

• B27B5/08

  for sawing with the saw blade abutting parallel against a surface of the workpiece · CPC title

• B23D45/16

  Hand-held sawing devices with circular saw blades · CPC title

• B23D45/003

  for particular purposes · CPC title

• B23D45/165

  with a plurality of saw blades or saw blades having plural cutting zones · CPC title

• B28D1/048 Primary

  with a plurality of saw blades (B28D1/046 takes precedence) · CPC title