Saber saw

Patent metadata

Field	Value
Publication number	US-9248517-B2
Application number	US-201313782832-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Mar 3, 2012
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A saber saw including: a motor; a housing accommodating the motor; a plunger held to be reciprocatable in the housing and to which a blade is mounted at a leading end thereof, and a movement converting part provided between the motor and the plunger and is configured to convert rotation movement of the motor into reciprocating movement of the plunger, wherein a bearing metal is fixed to an outer peripheral surface of the plunger.

First claim

What is claimed is:

1. A saber saw comprising:
a motor;
a housing accommodating the motor;
a gear cover arranged inside the housing;
a guide sleeve arranged at an inner side of the gear cover;
a plunger held to be reciprocatable inside the guide sleeve and to which a blade is mounted at a leading end thereof, and
a movement converting part provided between the motor and the plunger and is configured to convert rotation movement of the motor into reciprocating movement of the plunger,
wherein a first bearing metal is provided at a front portion of the plunger and a second bearing metal is provided at a rear portion of the plunger and the second bearing metal is mounted and fixed to an outer peripheral surface of the plunger,
wherein the second bearing metal and the plunger are two separate structures,
wherein the plunger is configured to slide relative to the guide sleeve via the second bearing metal, and
wherein the second bearing metal is made of iron-based sintered materials having lubricant impregnated therein.

2. The saber saw according to claim 1 , wherein the first bearing metal is fixed to the guide sleeve, and
wherein the second bearing metal is configured to reciprocate together with the plunger.

3. The saber saw according to claim 1 , wherein the guide sleeve is a single member extending in the front-rear direction, covering the plunger, and abutting on or sliding with the first and second bearing metals, respectively.

4. The saber saw according to claim 1 , wherein the guide sleeve is substantially cylindrical and the first bearing metal is fixed to an inner periphery of a front portion of the guide sleeve.

5. The saber saw according to claim 4 , wherein the movement converting part comprises:
a second shaft configured to be rotated by the motor in the housing, and
a reciprocating plate being attached to the second shaft and configured to move the plunger.

6. The saber saw according to claim 5 , wherein the guide sleeve has a hole into which the reciprocating plate is configured to be inserted, and
wherein the first bearing metal reciprocates within a range including an area of the hole.

7. The saber saw according to claim 6 , wherein a flange part is foamed to the plunger,
wherein the second bearing metal is inserted rear to the flange part, and
wherein a pressing member is provided to a rear portion of the second bearing metal and is configured to prevent the second bearing metal from being separated.

8. The saber saw according to claim 7 , wherein a flange part that holds a rear end of the second bearing metal is formed to the pressing member, and
wherein the pressing member enables a roller shaft, which is inserted into the plunger, to penetrate therethrough, thereby preventing the pressing member from being separated from the plunger.

Assignees

• Hitachi Koki Kk

Inventors

• Fujiwara Masahiro

Classifications

• B23D49/162 Primary

  Pad sawing devices · CPC title

• B23D49/165

  with means to move the saw blades in an orbital path · CPC title

• B23D51/10

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

• B23D51/16

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

• B23D51/161

  with dynamic balancing · CPC title