Rebar tying tool

Patent metadata

Field	Value
Publication number	US-11346107-B2
Application number	US-202016739321-A
Country	US
Kind code	B2
Filing date	Jan 10, 2020
Priority date	Jan 28, 2016
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

The disclosure herein discloses a rebar tying tool that ties plural rebars using a wire. The rebar tying tool includes a housing and a twisting motor, and may include a twisting mechanism that twists the wire around the plural rebars by the twisting motor. The twisting mechanism may include a screw shaft, a gripping member that grips the wire in cooperation with rotation of the screw shaft, a first reduction mechanism that reduces and transmits rotation of the twisting motor to a relay shaft, and a second reduction mechanism that reduces and transmits rotation of the relay shaft to the screw shaft. The first reduction mechanism may be a coaxial reduction mechanism, and the second reduction mechanism may be a parallel-axis reduction mechanism.

First claim

What is claimed is:

1. A rebar tying tool having a front end in a front-back direction that is configured to receive rebars and an up-down direction that is transverse to the front-back direction, comprising:
a wire feeding mechanism;
a feeding motor configured to drive the wire feeding mechanism;
a wire twisting mechanism that is configured to receive wire from the wire feeding mechanism and twist the wire around the rebars;
a twisting motor configured to drive the wire twisting mechanism;
a reel chamber configured to house a reel of wire to supply to the wire feeding mechanism;
a housing that (1) houses the wire feeding mechanism, (2) forms part of the reel chamber, and (3) has an opening above the reel chamber in the up-down direction that is configured such that the reel can be inserted through the opening;
a hand grip below the reel chamber in the up-down direction;
a battery attachment portion below the hand grip in the up-down direction; and
an openable cover that covers the opening when in a closed position, wherein
the wire feeding mechanism includes:
a driving gear coupled to the feeding motor;
a driven gear that is configured to be selectively driven by the driving gear; and
a releasing lever (1) to which the driven gear is rotatably attached and (2) that is configured to position the driven gear in a first position in which the driven gear engages the driving gear and a second position in which the driven gear is disengaged from the driving gear, and
at least a part of the releasing lever is under the cover when the cover is in the closed position.

2. The rebar tying tool according to claim 1 , wherein the cover is attached to the housing and has an open position.

3. The rebar tying tool according to claim 2 , wherein the cover is rotatably attached to the housing and rotatable between the open position and the closed position.

4. The rebar tying tool according to claim 3 , wherein the cover has an axis of rotation that is transverse to the up-down direction and the front-back direction.

5. The rebar tying tool according to claim 1 , further comprising:
a main switch operable to switch power of the rebar tying tool on and off; and
a main power LED that is configured to display the on/off state of the power;
wherein the main switch and the main power LED are lateral of the cover in a direction perpendicular to the up-down direction and the front-back direction.

6. The rebar tying tool according to claim 1 , wherein
the releasing lever extends forward of the cover in the front-back direction.

7. The rebar tying tool according to claim 1 , wherein the cover covers the driving gear and the driven gear when the cover is in the closed position.

8. The rebar tying tool according to claim 1 , wherein the twisting motor is in front of the reel chamber in the front-back direction.

9. The rebar tying tool according to claim 1 , wherein the feeding motor is in front of the reel chamber in the front-back direction and beside the twisting motor in a direction transverse to the front-back direction and the up-down direction.

10. The rebar typing tool according to claim 1 , wherein:
the wire feeding mechanism further includes a lock lever configured to retain the releasing lever in a position in which the releasing lever positions the driven gear in the first position; and
the driving gear and the driven gear are configured such that the wire is fed between the driving gear and the driven gear when the driven gear is in the first position and is not fed between the driving gear and the driven gear when the driven gear is in the second position.

11. The rebar tying tool according to claim 10 , wherein the releasing lever is biased to the position in which the driven gear is in the first position.

12. The rebar tying tool according to claim 11 , wherein the lock lever is configured to selectively hold the releasing lever in the position in which the driven gear is in the first position.

13. The rebar tying tool according to claim 10 , further comprising a guide member (1) configured to guide the wire supplied from the reel housed in the reel chamber to the driving gear and the driven gear and (2) in front of the reel chamber in the front-rear direction;
wherein the driving gear and the driven gear are in front of the guiding member in the front-back direction.

14. The rebar tying tool according to claim 1 , further comprising a brake mechanism that is configured to selectively stop rotation of the reel.

15. The rebar tying tool according to claim 14 , wherein:
the brake mechanism and the feeding mechanism are configured such that the brake mechanism stops rotation of the reel when the feeding mechanism stops.

Assignees

• Makita Corp

Inventors

• Matsuno Tadasuke

Classifications

• E04G21/123 Primary

  Wire twisting tools (bundling articles by twisting, e.g. wire B65B13/28; bundling rods, sticks, or like elongated objects with, e.g. wire B65B27/10; tying devices for hops, vines or trees with, e.g. wire A01G17/08) · CPC title

• E04G21/16

  Tools or apparatus (devices for erecting fences E04H17/26) · CPC title

• B21F15/04

  without additional connecting elements or material, e.g. by twisting · CPC title

• B65B27/10

  Bundling rods, sticks, or like elongated objects · CPC title

• B65B13/28 Primary

  by twisting · CPC title