Hand-guided stroke-type saw having an untrue-running correction device, and method for correction of untrue running

Patent metadata

Field	Value
Publication number	US-10086450-B2
Application number	US-201615273990-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Sep 24, 2015
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A hand-guided stroke-type saw includes a stroke rod and a saw-blade receiver that is supported by the stroke rod. The stroke rod defines a stroke axis extending axially through the stroke rod. The saw-blade receiver is configured to receive a saw blade and defines a saw-blade receiver axis that extends axially through the saw-blade receiver and is substantially parallel to the stroke axis such that the saw-blade receiver is offset radially from the stroke axis in a first direction opposite to a direction of advance.

First claim

What is claimed is:

1. A hand-guided stroke-type saw, comprising:
a stroke rod that defines a stroke axis extending axially through the stroke rod; and
a saw-blade receiver that is configured to receive a saw blade, that defines a saw-blade receiver axis extending axially through the saw-blade receiver, and that is supported by the stroke rod such that the saw-blade receiver axis is substantially parallel to the stroke axis and such that the saw-blade receiver axis is offset radially from the stroke axis in a first direction opposite to a direction of advance; and
a first constraint member and at least one further constraint member configured to convert a displacement motion of at least one of (i) the saw-blade receiver, (ii) the stroke rod, and (iii) a stroke-rod guide into a rotary motion of the at least one of (i) the saw-blade receiver, (ii) the stroke rod and (iii) the stroke-rod guide;
wherein:
the displacement motion is in a direction perpendicular to the saw-blade receiver axis and the direction of advance that moves a saw blade received in the saw-blade receiver out from an initial position; and
the rotary motion is configured to counteract the displacement motion and return the saw blade back to the initial position.

2. The hand-guided stroke-type saw according to claim 1 , wherein the saw-blade receiver is rotatable about the stroke axis.

3. The hand-guided stroke-type saw according to claim 1 , wherein the saw-blade receiver is configured to adjust a first distance by which the saw-blade receiver axis is radially offset from the stroke axis.

4. The hand-guided stroke-type saw according to claim 1 , wherein at least one of (i) the saw-blade receiver, (ii) the stroke rod, and (iii) a stroke-rod receiver is configured to be movable or swivelable in at least one of a rotation and a displacement along at least one of (i) a transverse direction with respect to the stroke axis and (ii) the direction of advance.

5. The hand-guided stroke-type saw according to claim 4 , wherein the first constraint member and the at least one further constraint member are further configured to delimit at least one of a rotational play of the rotation and a displacement travel of the displacement of (i) the saw-blade receiver, (ii) the stroke rod, or (iii) the stroke-rod receiver.

6. The hand-guided stroke-type saw according to claim 5 , further comprising:
a third constraint member configured to delimit the at least one of the rotational play and the displacement travel of (i) the saw-blade receiver, (ii) the stroke rod, or (iii) the stroke-rod receiver.

7. The hand-guided stroke-type saw according to claim 5 , further comprising a housing, wherein:
the first constraint member defines a constraint-member receiver that is affixed to the housing, and that is rotatably connected to one of (i) the saw-blade receiver, (ii) the stroke rod and (iii) the stroke-rod receiver; and
the at least one further constraint member is received in the constraint-member receiver so as to be at least partially movable.

8. A method for correcting an untrue running of a saw blade received in a stroke-type saw in operation with a workpiece, comprising:
advancing a saw-blade along a direction of advance for a workpiece,
the saw-blade receiver rotatably mounted to at least one stroke rod so as to be rotatable about a stroke axis of the at least one stroke rod,
the saw-blade received in a saw-blade receiver in a rotatably fixed manner such that a saw-blade receiver axis of the saw-blade receiver is radially offset from the stroke axis along a direction opposite the direction of advance and is parallel to the stroke axis; and

in response to a displacement motion of at least one of (i) the saw blade receiver, (ii) the stroke rod, and (iii) a stroke rod guide due to an untrue running of the saw blade along the direction of advance, engaging a first constraint member and at least one further constraint member to convert the displacement motion into a rotary motion of the at least one of (i) the saw-blade receiver, (ii) the stroke rod and (iii) the stroke-rod guide;
wherein:
the displacement motion is in a direction perpendicular to the saw-blade receiver axis and the direction of advance so as to move the saw blade out from an initial position; and
the rotary motion returns the saw blade to an initial position relative to the at least one stroke rod to counteract the untrue running.

9. The method according to claim 8 , wherein:
advancing the saw blade along the direction of advance with an untrue running causes the saw blade to be aligned transversely relative to the direction of advance; and
the transverse alignment of the saw blade causes at least one of a reversal of the rotation of the saw-blade receiver and a counter transverse force acting on a lateral face of the saw blade that counteracts the untrue running and returns the saw blade to the initial position relative to the at least one stroke rod.

10. A hand-guided stroke-type saw, comprising:
a stroke rod that defines a stroke axis extending axially through the stroke rod; and
a saw-blade receiver that is configured to receive a saw blade, that defines a saw-blade receiver axis extending axially through the saw-blade receiver, and that is supported by the stroke rod such that the saw-blade receiver axis is substantially parallel to the stroke axis and such that the saw-blade receiver axis is offset radially from the stroke axis in a first direction opposite to a direction of advance;
wherein, when the saw blade is received in the saw blade receiver, the saw-blade receiver is operable to adjust a first distance by which the saw-blade receiver axis is radially offset from the stroke axis.

11. The hand-guided stroke-type saw according to claim 10 , wherein the saw-blade receiver is rotatable about the stroke axis.

12. The hand-guided stroke-type saw according to claim 10 , wherein at least one of (i) the saw-blade receiver, (ii) the stroke rod, and (iii) a stroke-rod receiver is configured to be movable or swivelable in at least one of a rotation and a displacement along at least one of (i) a transverse direction with respect to the stroke axis and (ii) the direction of advance.

13. The hand-guided stroke-type saw according to claim 12 , further comprising:
a first constraint member and at least one further constraint member configured to delimit at least one of a rotational play of the rotation and a displacement travel of the displacement of (i) the saw-blade receiver, (ii) the stroke rod, or (iii) the stroke-rod receiver.

14. The hand-guided stroke-type saw according to claim 13 , further comprising:
a third constraint member configured to delimit the at least one of the rotational play and the displacement travel of (i) the saw-blade receiver, (ii) the stroke rod, or (iii) the stroke-rod receiver.

15. The hand-guided stroke-type saw according to claim 13 , further comprising a housing, wherein:
the first constraint member defines a constraint-member receiver that is affixed to the housing, and that is rotatably connected to one of (i) the saw-blade receiver, (ii) the stroke rod and (iii) the stroke-rod receiver; and
the at least one further constraint member is received in the constraint-member receiver so as to be at least partially movable.

16. A hand-guided stroke-type saw, comprising:
a stroke rod that defines a stroke axis extending axially through the stroke rod;
a saw-blade receiver that is configured to receive a saw blade, that defines a saw-blade receiver axis extending axially through the saw-blade receiver, and that is supported by the str

Assignees

• Bosch Gmbh Robert

Inventors

• Klipfel Sebastian
• Fankhauser Marcel

Classifications

• B23D51/10 Primary

  for hand-held or hand-operated devices · CPC title

• B23D49/167

  with means to adjust the guide plate or with means to adjust the plane in which the saw blade moves · CPC title

• B23D49/162

  Pad sawing devices · CPC title

• B23D51/025 Primary

  of arrangements for guiding the saw blade · CPC title