Driving device

Patent metadata

Field	Value
Publication number	US-12134174-B2
Application number	US-202017780674-A
Country	US
Kind code	B2
Filing date	Oct 30, 2020
Priority date	Nov 28, 2019
Publication date	Nov 5, 2024
Grant date	Nov 5, 2024

Abstract

A driving device includes an operable striking unit, a piston upper chamber configured to operate the striking unit by gas pressure, a housing, a head cap provided in the housing, a passage provided in the head cap, and an exhaust valve operably provided in the housing and configured to open and close the passage. The exhaust valve includes a contact portion and a non-contact portion, the contact portion comes into and out of contact with the head cap on an outer side of the passage in a radial direction of the passage, the non-contact portion is provided on an inner side of the contact portion in the radial direction of the passage, and the non-contact portion is provided at a position separated from the head cap in a state where die contact portion is in contact with the head cap.

First claim

The invention claimed is:

1. A driving device, comprising:
a housing;
a striking unit arranged in the housing;
a first pressure chamber arranged in the housing and configured to operate the striking unit by gas pressure;
a valve seat fixed in the housing;
a passage connecting the first pressure chamber and outside of the housing through the valve seat that has an opening for the passage; and
a valve body operably provided in the housing and arranged outside the first pressure chamber, and configured to open and close the opening of the passage by coming into and out of contact with the valve seat,
wherein the valve body includes a contact portion and a non-contact portion,
wherein the valve seat has a first area including an edge of the opening, and has a second area other than the first area,
wherein the valve body opens and closes the opening of the passage,
wherein when the valve body closes the opening of the passage, the contact portion overlaps with the second area, and
wherein the non-contact portion comprises a depression away from the opening, and when the valve body closes the opening of the passage, the non-contact portion overlaps with the first area of the valve seat.

2. The driving device according to claim 1 , wherein the contact portion and the non-contact portion are annularly arranged and are provided concentrically with each other.

3. The driving device according to claim 1 ,
wherein the non-contact portion further comprises a bulge portion surrounded by the depression, and
wherein the bulge portion projects toward the first pressure chamber in an axial direction of the passage.

4. The driving device according to claim 1 , wherein the non-contact portion includes a flat surface intersecting a moving direction of the valve body to close and open the opening of the valve seat.

5. The driving device according to claim 1 , wherein an internal thickness of the non-contact portion of the valve body is constant.

6. The driving device according to claim 1 , wherein the passage in the valve seat is curved toward first pressure chamber.

7. The driving device according to claim 1 , wherein the valve body is made of synthetic resin or synthetic rubber.

8. The driving device according to claim 7 , wherein, when the contact portion is pressed to the valve seat, the valve body is elastically deformed such that the contact portion and the non-contact portion lie flush with each other.

9. The driving device according to claim 1 , further comprising:
an accumulator chamber provided in the housing and configured to store a gas;
a second pressure chamber to which the gas is supplied from the accumulator chamber and which is configured to operate the valve body to approach the valve seat by pressure of the gas;
a valve configured to switch between an initial state in which the second pressure chamber is connected to the outside of the housing and the second pressure chamber is disconnected from the accumulator chamber and an operating state in which the second pressure chamber is connected to the accumulator chamber and the second pressure chamber is disconnected from the outside of the housing;
a trigger which is provided on the housing and to which an operation force is applied and released;
a push lever provided on the housing and configured to come into and out of contact with an object into which a fastener struck by the striking unit is driven;
an ejection unit provided on the housing and configured to guide the striking unit; and
a magazine which contains the fastener to be supplied to the ejection unit,
wherein the valve is in the initial state when the operation force to the trigger is released or the push lever is separated from the object, and
wherein the valve is in the operating state when the operation force is applied to the trigger and the push lever is in contact with the object.

10. A driving device, comprising:
a housing;
a striking unit arranged in the housing;
a first pressure chamber arranged in the housing and configured to operate the striking unit by gas pressure;
a valve seat fixed in the housing;
a passage connecting the first pressure chamber and outside of the housing through the valve seat that has an opening for the passage, wherein the valve seat has a first area includes an edge of the opening, and has a second area other than the first area; and
a valve body operably provided in the housing and arranged outside the first pressure chamber, and configured to open and close the opening of the passage,
wherein the valve body comprises:
a contact portion positioned to overlap with the second area of the valve seat when the valve body closes the opening of the passage; and
a depression portion recessed away from the opening of the valve seat and positioned to overlap with the first area of the valve seat when the valve body closes the opening of the passage.

11. The driving device according to claim 10 , wherein the contact portion and the depression portion are annularly arranged and are arranged concentrically with each other.

12. The driving device according to claim 10 ,
wherein the valve body further comprises a bulge portion surrounded by the depression portion, and
wherein the bulge portion projects toward the first pressure chamber in an axial direction of the passage.

Assignees

• Koki Holdings Co Ltd

Inventors

• FUJISAWA Kohei

Classifications

• B25C1/046

  Trigger valve and trigger mechanism · CPC title

• B25C1/047 Primary

  Mechanical details · CPC title

• B25C1/045 Primary

  main valve and main cylinder · CPC title