# US 2018/0021867 A1 · Reciprocating tool

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- Number: US 2018/0021867 A1
- Document ID: US20180021867A1
- Status: Published application
- Kind: A1
- Application number: 15/625,369
- Filed: 2017-06-16
- Published: 2018-01-25
- Earliest claimed: 2016-07-22
- Assignees: Makita Corporation
- Applicants: Makita Corporation
- Inventors: Yosuke NAOI; Yasushi OGURA
- Web page: https://patentgrep.com/patent/US20180021867A1

## CPC

- B23D 49/162: {Pad sawing devices}
- B23D 51/02: of beds; of guiding arrangements for work-tables or saw carriers; of frames
- B23D 51/161: {with dynamic balancing}
- B23D 51/166: {Devices for arresting movement of the saw blades (B23D51/20 takes precedence)}
- B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q)

## 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.

## Claims

### Claim 1

A reciprocating tool comprising:
a motor;
a reciprocating motion conversion mechanism that converts rotation of the motor into reciprocating motion;
a rod that is connected to the reciprocating motion conversion mechanism and that engages in reciprocating motion; and
a roller that is capable of rolling and that has a contacting portion capable of coming in contact with the rod,
wherein a cross-section of the rod has no corners; and
the contacting portion of the roller has an hourglass profile.

### Claim 2 (depends on 1)

The reciprocating 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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

The reciprocating 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.

### Claim 6 (depends on 1)

The reciprocating 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.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

The reciprocating 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.

### Claim 9 (depends on 8)

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