Reciprocating tool

Patent metadata

Field	Value
Publication number	US-10328506-B2
Application number	US-201715625369-A
Country	US
Kind code	B2
Filing date	Jun 16, 2017
Priority date	Jul 22, 2016
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A reciprocating saw serving as reciprocating tool is equipped with a motor, a drive transmission mechanism that converts rotation of the motor into reciprocating motion, a rod that is connected to the drive transmission mechanism and that engages in reciprocating motion, and an upper roller and a lower roller that are capable of rolling and that have depressed portions that are capable of coming in contact with the rod, wherein the cross-section of the rod has no corners, and the depressed portions of the upper roller and the lower roller have hourglass-like profiles.

First claim

What is claimed is:

1. A reciprocating cutting tool comprising:
a motor with a rotational output;
a reciprocating motion conversion mechanism operatively connected to the motor;
a rod that is connected to and driven by the reciprocating motion conversion mechanism to reciprocate linearly along its entire length; and
a roller that is capable of rolling and that has a contacting surface configured to contact the rod,
wherein:
a cross-section of the rod has no corners;
the roller has a longitudinal axis and a shape of a spool such that the contacting surface is an exterior surface of the roller between ends of the roller that, in cross section along the longitudinal axis of the roller, (1) has a maximum distance from the longitudinal axis of the roller at the ends of the roller, (2) has a minimum distance from the longitudinal axis of the roller at the midpoint of the exterior longitudinal surface, and (3) is an arcuate surface between the maximum distance and the minimum distance;
the rod has a longitudinal axis that is a straight line;
the reciprocating motion conversion mechanism includes (1) a rotating gear with a rotation axis perpendicular to the longitudinal axis of the rod and (2) a shaft in the rotating gear that is operatively connected to the rod to cause the rod to reciprocate and has a longitudinal axis that is parallel to but offset from the rotation axis of the rotating gear.

2. The reciprocating cutting tool according to claim 1 , wherein
the roller is one of a plurality thereof that are provided and that are arranged in mutually opposing fashion.

3. The reciprocating cutting tool according to claim 1 , wherein
a movement-constraining plate is provided that constrains movement in an axial direction of the roller.

4. The reciprocating cutting tool according to claim 1 , wherein
the cross-section of the rod is circular or oval.

5. The reciprocating cutting tool according to claim 1 , wherein
the rod engages in front-to-back and back-to-front reciprocating motion; and
the roller comes in contact with a rear portion of the rod when the rod is positioned at a front end of a range of reciprocating motion of the rod.

6. The reciprocating cutting tool according to claim 1 further comprising:
a conversion mechanism housing at which the reciprocating motion conversion mechanism is arranged,
wherein the conversion mechanism housing is equipped with a plurality of conversion mechanism housing portions;
at least two of the conversion mechanism housing portions are equipped with planar portions that mutually overlap; and
at least one of the planar portions is provided with a sealing member which is an elastic body.

7. The reciprocating cutting tool according to claim 1 , wherein
the rod has, at a back end portion thereof, a guide roller that is guided by a guide.

8. The reciprocating cutting tool according to claim 1 further comprising:
a conversion mechanism housing at which the reciprocating motion conversion mechanism is arranged,
wherein the roller is supported so as to be capable of rolling around a roller shaft; and
the roller shaft is rotatably supported with respect to the conversion mechanism housing.

9. The reciprocating cutting tool according to claim 8 , wherein
the roller shaft is rotatably supported by an oilless bearing.

10. The reciprocating cutting tool according to claim 1 , wherein
the reciprocating motion conversion mechanism includes a slider having first and second ends;
the first end of the slider is attached to the shaft;
and the second end of the slider is attached to a guide roller that moves along a path that is parallel to the longitudinal axis of the rod.

11. The reciprocating cutting tool according to claim 10 , wherein
the guide roller comprises two side rollers.

12. The reciprocating cutting tool according to claim 1 , wherein:
the reciprocating motion conversion mechanism includes a link having a first end connected to the rotating gear and a second end connected to the rod; and
the first end of the link is connected to the rotating gear at a location offset from the rotation axis of the rotating gear.

13. The reciprocating cutting tool according to claim 1 , further comprising:
a conversion mechanism housing at which the reciprocating motion conversion mechanism is arranged;
wherein the inner roller is rotatably supported with respect to the conversion mechanism housing.

14. The reciprocating cutting tool according to claim 13 , wherein
the inner roller is rotatably supported by an oilless bearing.

15. A reciprocating cutting tool comprising:
a motor with a rotational output;
a reciprocating motion conversion mechanism operatively connected to and driven by the motor;
a rod that is connected to and driven by the reciprocating motion conversion mechanism to reciprocate linearly along its entire length;
a roller assembly configured to contact the rod and direct the rod in a linear direction as the rod reciprocates; and
a housing that houses the reciprocating motion conversion mechanism, the rod and the roller assembly;
wherein:
the rod has a longitudinal axis that is a straight line;
the reciprocating motion conversion mechanism includes (1) a rotating gear with a rotation axis perpendicular to the longitudinal axis of the rod and (2) a shaft in the rotating gear that is operatively connected to the rod to cause the rod to reciprocate and has a longitudinal axis that is parallel to but offset from the rotation axis of the rotating gear;
an outer roller rotatably surrounding the inner roller; wherein the outer roller engages the rod; and wherein the outer roller has (a) a longitudinal axis, (b) a contacting surface configured to contact the rod, and (c) a shape of a spool such that the contacting surface is an exterior surface of the outer roller between ends of the outer roller that, in cross section along the longitudinal axis of the outer roller, (1) has a maximum distance from the longitudinal axis of the outer roller at the ends of the outer roller, (2) has a minimum distance from the longitudinal axis of the outer roller at the midpoint of the exterior longitudinal surface, and (3) is an arcuate surface between the maximum distance and the minimum distance.

16. The reciprocating cutting tool according to claim 15 , wherein the reciprocating cutting tool includes two of the roller assembly arranged in mutually opposing fashion.

17. The reciprocating cutting tool according to claim 15 , wherein a movement-constraining plate is provided that constrains movement of the outer roller in an axial direction of the outer roller.

18. The reciprocating cutting tool according to claim 15 , wherein the cross-section of the rod is circular or oval.

19. The reciprocating cutting tool according to claim 15 , wherein:
the rod engages in front-to-back and back-to-front reciprocating motion; and
the roller assembly comes in contact with a rear portion of the rod when the rod is positioned at a front end of a range of reciprocating motion of the rod.

20. The reciprocating cutting tool according to claim 15 , further comprising:
a conversion mechanism housing at which the reciprocating motion conversion mechanism is arranged,
wherein the conversion mechanism housing is equipped with a plurality of conversion mechanism housing portions;
at least two of the conversion mechanism housing portions are equipped with planar portions that mutually overlap; and
at least one of the planar portions is provided with a sealing member

Assignees

• Makita Corp

Inventors

• Naoi Yosuke
• Ogura Yasushi

Classifications

• B23D51/16

  of drives or feed mechanisms for straight tools, e.g. saw blades, or bows · CPC title

• B23D51/166

  Devices for arresting movement of the saw blades (B23D51/20 takes precedence) · CPC title

• B23D51/02 Primary

  of beds; of guiding arrangements for work-tables or saw carriers; of frames · CPC title

• B23D49/162 Primary

  Pad sawing devices · CPC title

• B23D51/161

  with dynamic balancing · CPC title