Fluid damper and driving tool

Patent metadata

Field	Value
Publication number	US-11590639-B2
Application number	US-201916975348-A
Country	US
Kind code	B2
Filing date	Feb 27, 2019
Priority date	Mar 1, 2018
Publication date	Feb 28, 2023
Grant date	Feb 28, 2023

Abstract

A fluid damper includes a cylinder tube portion which is filled with a fluid, a piston which is provided so as to be movable in an inner portion of the cylinder tube portion and whose moving speed is controlled with resistance of the fluid, and a biasing member which expands and contracts in accordance with a position of the piston and which applies a force corresponding to an expansion and contraction amount of the biasing member to the piston. The resistance of the fluid at a time the piston moves is changed in accordance with the position of the piston.

First claim

The invention claimed is:

1. A driving tool comprising:
a driving mechanism which drives a fastener supplied to a nose portion;
a contact lever which is configured to switch between presence and absence of actuation of the driving mechanism; and
a fluid damper which is configured to control a moving speed of the contact lever;
wherein the fluid damper comprises:
a cylinder tube portion which is filled with a fluid;
a piston which is provided so as to be movable in an inner portion of the cylinder tube portion and whose moving speed is controlled with resistance of the fluid;
a biasing member which expands and contracts in accordance with a position of the piston and which applies a force corresponding to an expansion and contraction amount of the biasing member to the piston,
wherein the resistance of the fluid at a time the piston moves is changed in accordance with the position of the piston;
a shaft portion which extends out from the cylinder tube portion, and which is moved by the piston;
a moving member positioned outside of the cylinder tube portion and which is moved by the shaft portion; and
a regulating member which is actuated by the moving member, wherein the regulating member is positioned between moving member and the contact lever, and the regulating member is configured to regulate a position of the contact lever.

2. The driving tool according to claim 1 , wherein
the resistance of the fluid at the time the piston moves is changed in accordance with a change in the force applied to the piston by the biasing member.

3. The driving tool according to claim 2 , wherein
the force applied to the piston by the biasing member changes in accordance with the expansion and contraction amount of the biasing member, and when the piston moves from a position where the force applied thereto by the biasing member is large to a position where the force applied thereto by the biasing member is small, the resistance of the fluid at the time the piston moves is reduced.

4. The driving tool according to claim 1 , wherein
the resistance of the fluid at the time the piston moves is changed by changing area of a flow path through which the fluid passes.

5. The driving tool according to claim 1 further comprising:
a flow path expanded portion where area of a flow path through which the fluid passes is increased in accordance with a terminal position of a movement range of the piston which is moved by the force applied by the biasing member.

6. The driving tool according to claim 1 , wherein the fluid damper includes a first bypass flow path, and an amount of fluid passing through the first bypass flow path varies with position of the piston with respect to the first bypass flow path.

7. The driving tool according to claim 6 , wherein the fluid damper further includes a second bypass flow path and an amount of fluid passing through the second bypass flow path varies with position of the piston with respect to the second bypass flow path.

8. The driving tool according to claim 7 , further including a hole which passes through the piston and which is selectively opened and closed by a check valve.

9. The driving tool according to claim 1 , wherein the regulating member is positioned between the moving member and the contact lever with respect to a moving direction of the moving member.

10. A driving tool comprising:
a driving mechanism which drives a fastener supplied to a nose portion;
a trigger which receives one operation for actuating the driving mechanism;
a contact arm which is provided so as to be reciprocally movable and which receives another operation for actuating the driving mechanism;
a contact lever which is provided so as to be capable of being actuated by operations of the trigger and the contact arm and which is configured to switch between presence and absence of actuation of the driving mechanism; and
a fluid damper which is configured to control a moving speed of the contact lever, wherein
the fluid damper comprises:
a cylinder tube portion which is filled with a fluid;
a piston which is provided so as to be movable in an inner portion of the cylinder tube portion and whose moving speed is controlled with resistance of the fluid;
a biasing member which expands and contracts in accordance with a position of the piston and which applies a force corresponding to an expansion and contraction amount of the biasing member to the piston,
wherein the resistance of the fluid at a time the piston moves is changed in accordance with the position of the piston; and
the driving tool further including a hole which passes through the piston and which is selectively opened and closed by a check valve.

11. The driving tool according to claim 10 further comprising:
a regulating part which is configured to switch between presence and absence of actuation of the contact arm of the contact lever, wherein
the regulating part includes:
a moving member;
a regulating member which is actuated by the moving member and which is configured to regulate a position of the contact lever to an actuation standby position where the contact arm is able to actuate the contact lever; and
the fluid damper, and

the fluid damper is configured to control a moving speed of the moving member that actuates the regulating member.

12. The driving tool according to claim 11 , further including:
a shaft portion which extends out from the cylinder tube portion and which is moved by the piston, and
wherein the moving member is moved by the shaft portion.

13. The driving tool according to claim 10 , wherein the fluid damper includes a first bypass flow path and an amount of fluid passing through the first bypass flow path varies with position of the piston with respect to the first bypass flow path.

14. The driving tool according to claim 13 , wherein the fluid damper further includes a second bypass flow path and an amount of fluid passing through the second bypass flow path varies with position of the piston with respect to the second bypass flow path.

15. A driving tool comprising:
a driving mechanism which drives a fastener supplied to a nose portion;
a contact lever which is configured to switch between presence and absence of actuation of the driving mechanism; and
a fluid damper which is configured to control a moving speed of the contact lever;
wherein the fluid damper comprises:
a cylinder tube portion which is filled with a fluid;
a piston which is provided so as to be movable in an inner portion of the cylinder tube portion and whose moving speed is controlled with resistance of the fluid; and
a biasing member which expands and contracts in accordance with a position of the piston and which applies a force corresponding to an expansion and contraction amount of the biasing member to the piston,
wherein the resistance of the fluid at a time the piston moves is changed in accordance with the position of the piston;
wherein the fluid damper includes a first bypass flow path, and an amount of fluid passing through the first bypass flow path varies with position of the piston with respect to the first bypass flow path; and
the driving tool further including a hole which passes through the piston and which is selectively opened and closed by a check valve.

16. The driving tool according to claim 15 , wherein the fluid damper further includes a second bypass flow path and an amount of fluid passing through the second bypass flow path varies with position of the piston with respect to the second bypass flow path.

Assignees

• Max Co Ltd

Inventors

• Tanaka Hiroshi

Classifications

• B25C1/047 Primary

  Mechanical details · CPC title

• F16F9/3235

  of cylinders (F16F9/483 takes precedence) · CPC title

• B25C1/043

  Trigger valve and trigger mechanism · CPC title

• B25C1/008 Primary

  Safety devices · CPC title

• F16F9/483

  characterised by giving a particular shape to the cylinder, e.g. conical · CPC title