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EP-4566759-B1 - DRIVING TOOL

EP4566759B1EP 4566759 B1EP4566759 B1EP 4566759B1EP-4566759-B1

Inventors

  • MORIWAKI, KOUSUKE
  • KONDOU, YOSHIHIKO
  • TAKAHASHI, HIROYUKI

Dates

Publication Date
20260513
Application Date
20231221

Claims (2)

  1. A driving tool (10) for driving a fastener to a fastening target object, comprising: a contact arm (26) capable of moving in a first direction by being brought into contact with and pressed against the fastening target object; a driving portion (13) configured to start a driving operation of the fastener on condition that the contact arm (26) moves by a predetermined amount in the first direction; and a restricting portion (62) configured to restrict the driving operation performed by the driving portion (13) when an inertial force is generated in the first direction, wherein the driving portion (13) includes a first air chamber (17), a striking piston (15) configured to drive the fastener by supplying air from the first air chamber (17) via a first flow path, and a first valve (16) configured to open and close the first flow path, characterized in that the driving portion (13) further includes a second air chamber (18) configured to store air to be applied in a direction in which the first valve (16) is closed, a second flow path (19) configured to allow the second air chamber (18) to communicate with an outside of the driving tool (10), and a second valve (60) configured to open and close the second flow path (19), wherein the restricting portion (62) is configured to prevent discharge of air from the second air chamber (18) by throttling or closing the second flow path (19) when the inertial force is generated in the first direction.
  2. The driving tool (10) according to claim 1, wherein when a direction opposite to the first direction is defined as a second direction, the restricting portion (62) includes a movable portion (62) configured to move in the first direction and the second direction, and a biasing portion (63) configured to bias the movable portion (62) in the second direction, and the movable portion (62) is configured to throttle or close the second flow path (19) by moving in the first direction, open the second flow path (19) by moving in the second direction, and move in the first direction against a biasing force of the biasing portion (63) when the inertial force is generated in the first direction.

Description

TECHNICAL FIELD The present disclosure relates to a driving tool for driving a fastener to a fastening target object. BACKGROUND ART A driving tool for driving a fastener such as a nail or a pin to a building member such as wood, a steel plate, or concrete is widely known. In such a driving tool, a driver is driven by using compressed air, gas combustion pressure, a spring force, or the like, and the fastener is driven by the driver. As such a driving tool, there is a driving tool including a safety device called a contact arm (see, for example, JP2019-063928A). The contact arm is provided in a manner of protruding from a tip end of a nose portion, and can be pushed in a counter-protruding direction. When the contact arm (the nose portion) is brought into contact with and is pressed against a fastening target object, the contact arm is pushed in, and a sign on state in which the fastener can be driven is obtained. If the contact arm is not in the sign on state, a driving operation cannot be performed even when a trigger lever is operated. That is, the fastener is not driven unless the contact arm is pressed against the fastening target object. During using the driving tool including the contact arm, if a cylinder cap top surface (a surface opposite to the nose) hits against a member or the like unintentionally, an inertial force that causes the contact arm to move in an operation direction (the counter-protruding direction) is generated. In order to prevent the contact arm from being brought into the sign on state by such an inertial force, in the related art, a load of a biasing member for biasing the contact arm in a non-operation direction is set to be high, and thus the contact arm does not move even when the inertial force is generated. However, when the load of the biasing member is set to be high, a pressing load of the contact arm increases during normal use, and thus there is a problem that a burden is imposed on an operator and usability is deteriorated. In a case of a driving tool that drives a piston with compressed air, by slowing down a reaction of a main valve that supplies compressed air to the piston, a fastener can be prevented from being driven within a time during which the contact arm is operated due to the inertial force. However, when the reaction of the main valve is slowed down, there is a problem that operation feeling for driving is poor during normal use, which leads to a reduction in working efficiency. Document EP 3 156 180 A1 discloses a driving tool according to the preamble of claim 1. SUMMARY OF INVENTION The present disclosure provides a driving tool capable of ensuring safety without increasing a biasing load of a contact arm or slowing down a reaction of a main valve even when an inertial force which causes the contact arm to move in an operation direction is generated. The invention provides a driving tool, according to claim 1, for driving a fastener to a fastening target object. The driving tool includes: a contact arm capable of moving in a first direction by being brought into contact with and pressed against the fastening target object, a driving portion configured to start a driving operation of the fastener on condition that the contact arm moves by a predetermined amount in the first direction; and a restricting portion configured to restrict the driving operation performed by the driving portion when an inertial force is generated in the first direction. As described above, the present disclosure includes a restricting portion that restricts a driving operation performed by a driving portion when the inertial force is generated in a first direction. Accordingly, safety of the driving tool can be ensured without increasing a spring load of the contact arm or slowing down the reaction of the main valve even when the inertial force that causes the contact arm to move in the operation direction is generated. BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is an external view of a driving tool;Fig. 2 is a partially enlarged view of the driving tool;Fig. 3 is a partial cross-sectional view of a vicinity of a trigger lever;Fig. 4 is a partial cross-sectional view of the vicinity of the trigger lever viewed from another angle;Fig. 5 is a partial cross-sectional view illustrating a structure of a contact arm;Fig. 6 is a cross-sectional view of the vicinity of the trigger lever in a state in which the trigger lever is operated;Fig. 7 is an enlarged view of a portion A illustrated in Fig. 6;Fig. 8 is a cross-sectional view of the vicinity of the trigger lever obtained when an inertial force starts to occur in a first direction,Fig. 9 is an enlarged view of a portion B illustrated in Fig. 8;Fig. 10 is a cross-sectional view of the vicinity of the trigger lever obtained when a movable portion engages with a contact portion;Fig. 11 is an enlarged view of a portion C illustrated in Fig. 10;Fig. 12 is diagram illustrating a first modification, which is a perspective view of a vicinity of