JPH0536625Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a fastener driving tool, and more particularly, to an improvement of the fastener feeding pawl mechanism thereof.

[Prior art and its problems] A conventional nail driver as a fastener driving tool has a nose portion having a nail driving hole as a fastener and a fastener, that is, a nail, that communicates with the nail driving hole in the nose portion. Some machines are known that include a machine main body that constitutes a feed passage. In this nailer, a piston that reciprocates the nail feeding claw member,
The cylinder device is fixed to the main body of the machine, and the nail feed pawl member rotates elastically when retracting to allow subsequent nails to escape. Therefore, a relatively complex structure is required.

[Object of the invention] The object of the invention is to provide a fastening tool feeding pawl mechanism with a simple structure that allows fastening tools such as subsequent nails to escape when retracting.

[Structure of the device] In order to achieve this object, the present invention includes a nose portion having a hole for driving a fastener such as a nail, and a machine body portion that constitutes a fastener feed passage leading to the hole for driving a fastener in the nose portion. The fastener driving tool includes a piston-cylinder device pivotally connected to the machine body via a shaft, a fastener feed pawl member attached to the outer end of the piston rod of the piston-cylinder device, and the machine main body. and said piston.
a fastener feed pawl mechanism disposed between the cylinder devices and including spring means for resiliently biasing the piston and cylinder device so as to press the feed pawl member toward the feed passage; A fastener driving tool is provided.

[Function] When the feed claw member of a fastener such as a nail retreats under the operation of the piston cylinder device, if the feed claw member engages with the following fastener and tries to escape, the piston cylinder device itself rotates against the biasing force of the spring means, allowing the feed pawl member to escape.

[Examples] Hereinafter, the present invention will be described by way of examples with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, there is shown a nose portion 12 of a fastener driving tool, that is, a nail gun, having a nail driving hole 10 as a fastener,
On the inlet side of the nose portion 12, a fastener, that is, a nail feed passage 18 is formed by a machine body portion 14 and a gate portion 16. The nail feed passageway 18 opens into a magazine (not shown) and is adapted to receive the fastener or nail to be driven. The nail is moved by the nail feed pawl mechanism 20 through the nail feed passageway 18 to the nail entrance in the nose portion 12.

Nail feed pawl mechanism 20 includes a piston and cylinder arrangement 26 pivotally connected to trunnion 22 of machine body 14 via shaft 24 . A piston 30 is slidably mounted in the cylinder 28 of the piston-cylinder device 26, and a piston rod 32 extends from one side of the piston 30, and the piston rod 32 projects outward from one end of the cylinder 28. ing. A nail feed pawl member 34 is fixed to the outer end of the piston rod 32.

Pressure fluid is supplied from a pressure source (not shown) to one side of the piston 30 in the cylinder 28 through the passage 24A of the shaft 24, so as to cause the nail feed pawl member 34 to retreat. A spring 36 is installed between the opposite surface of the piston 30 and the opposite end of the cylinder 28, and constantly presses the piston 30 in the right direction as viewed in FIG. When not in use, the piston rod 32 is made to protrude outward.

A coil spring 40 is installed between the cylinder 28 of the piston/cylinder device 26 and the machine body 14, and the piston/cylinder is configured to press the nail feeding pawl member 34 fixed to the piston rod 32 toward the nail feeding path. The cylinder 28 of the device 26 is biased elastically.

[Effect of the invention] Therefore, as shown in the upper part of FIG. 34 moves the fastener or nail toward the nose 12, but when the piston rod 32 retracts as previously described, the feed pawl member 34 engages the trailing nail and the engagement causes the nail to move toward the nose 12. When force is applied so that the feed claw member 34 escapes this nail, the piston/cylinder device 26
The cylinder 28 rotates as shown in the lower part of FIG. 3 against the force of the coil spring 40. Therefore, the escape action of the nail feeding claw member 34 can be obtained with a simple structure.

In the above description, nails are used as fasteners, but it goes without saying that the fasteners may be screws or other similar fasteners.

[Brief explanation of drawings]

FIG. 1 is a side view of a feeding claw mechanism for fasteners such as nails according to the present invention. FIG. 2 is an enlarged partial cross-sectional bottom view of the feed pawl mechanism shown in FIG. 1. Figure 3 is like Figure 1,
FIG. 3 is a diagram illustrating the operation of the feed claw mechanism shown in FIG. 2; In the drawings, 12...nose section, 14...machine main body section, 16...gate section, 18...fastener feed passage, 20...feed claw mechanism, 22...trunnion, 24...shaft, 26... Piston/cylinder device, 28... cylinder, 30... piston, 32
. . . Piston rod, 34 . . . Nail, etc. fastener feeding claw member, 36 . . . Spring, 40 . . . Coil spring.

Claims (1)

[Scope of utility model registration request] A fastener driving tool that includes a nose portion having a fastener driving hole such as a nail, and a machine body portion that constitutes a fastener feed passage leading to the fastener driving hole in the nose portion, wherein a shaft is attached to the machine body portion. a piston and cylinder device pivotally connected through the piston and cylinder device, a fastener feed pawl member attached to the outer end of the piston rod of the piston and cylinder device, and installed between the machine body and the piston and cylinder device, A fastener driving tool characterized by having a fastener feed pawl mechanism including a spring means for elastically biasing the piston/cylinder device so as to press the feed pawl member toward the inside of the feed passage. .