JP2013139069A - Bolt fastening machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt fastening machine, in which a socket does not unintentionally come off from a drive cylinder.SOLUTION: In a bolt fastening machine comprising: a head part 12 provided at a distal end of a handle 11; a drive cylinder 20 attached to the head part and capable of mounting a socket 70 engaged with a bolt and/or a nut; a push rod 40 fitted into an insertion through hole 30 opened in the drive cylinder and capable of sliding in the insertion through hole; and a coming-off prevention sphere 50 capable of projecting and retracting from a side surface of the drive cylinder and configured so that the projection and retraction thereof are regulated by the push rod, the push rod is arranged so as to be slidable at a position recessed from the head part.

Description

  The present invention relates to a bolt tightening machine that attaches a socket to a drive cylinder, rotates the drive cylinder by operating a handle, and manually tightens a bolt or a nut. More specifically, the socket is connected to the drive cylinder. The present invention relates to a bolt tightening machine that can prevent unintentional disconnection.

  A so-called ratchet handle and a manual bolt tightening machine called a torque wrench are widely known, in which a socket that fits a bolt or nut is inserted into a drive cylinder, and the drive cylinder is rotated by operating the handle to tighten the bolt. (For example, refer to Patent Document 1).

  The socket is detachable from the drive cylinder so that it can be changed according to the size of the bolt or nut.

  In order to prevent the socket from falling off from the drive cylinder when the socket is mounted on the drive cylinder, in Patent Document 1, a retaining sphere urged outward by a spring is provided in a lateral hole formed in the drive cylinder, and the sphere Is fitted in a concave groove formed in the inner peripheral wall of the socket.

  However, in the above configuration, when a large socket corresponding to a large bolt or nut is used, or when a large force acts on the socket during tightening, the retaining sphere moves backward against the biasing force of the spring. Then, the socket may fall off from the drive cylinder.

  Therefore, a push rod that is slidable along the axial direction in the drive cylinder is arranged so that its head protrudes, and the push rod is pushed by a user operation so that the retaining sphere can be operated. A tightening machine has also been proposed (see, for example, Patent Document 2).

JP-A-9-207075 Utility model registration No. 3150148

  However, in the bolt tightening machine disclosed in Patent Document 2, the head of the push rod protrudes as described above, and the push rod is slid by pushing the protruding head. For this reason, the head of the push rod is accidentally pushed, or the push rod protruding during tightening or the like hits another member, so that the socket may be unintentionally removed.

  An object of the present invention is to provide a bolt fastening machine in which a socket is not unintentionally detached.

In order to solve the above problems, the bolt tightening machine of the present invention is:
A head portion provided at the tip of the handle;
A drive cylinder attached to the head portion and capable of being fitted with a socket for fitting with a bolt and / or a nut;
A push rod that fits in the insertion hole established in the drive cylinder and is slidable in the insertion hole;
A retaining sphere that can be projected and retracted from the side surface of the drive cylinder, and whose projection and depression are regulated by a push rod,
In the bolt tightening machine with
The push rod is slidably disposed at a position recessed from the head portion.

According to the present invention, the push rod is provided at a position where the head related to the user's operation is recessed from the head portion and does not protrude, so a small-diameter jig is required for the operation of the push rod. Thus, the user does not operate unintentionally or hits other members to be operated.
Accordingly, it is possible to prevent unintentional dropping of the socket attached to the drive cylinder.

It is principal part sectional drawing of the front-end | tip of the ratchet handle which is one Example of this invention, Comprising: The state before attaching a socket to a drive cylinder is shown. It is an exploded view perspective view of a drive cylinder. It is principal part sectional drawing of the ratchet handle which pushes in a push rod and is a state which can attach or detach a socket. It is principal part sectional drawing of the ratchet handle in which the push rod is pushed in and the socket is attached to the socket attachment part or in the middle of removal. It is principal part sectional drawing of the ratchet handle which shows the state by which the socket was attached to the drive cylinder.

  A bolt tightening machine according to the present invention will be described with reference to FIGS. In the following, a ratchet handle (10) is taken as an example of a bolt tightening machine, but the present invention is not limited to the ratchet handle (10), and of course can be applied to a torque wrench and other manual tools. .

  As shown in FIG. 1, the ratchet handle (10) has a handle (11) to be grasped by a user and a head portion (12) at the tip of the handle (11), and a drive cylinder is attached to the head portion (12). (20) is fitted. The drive cylinder (20) has a prismatic socket mounting part (21) on the tip side, and is attached to the head part (12) with the socket mounting part (21) protruding from the head part (12). ing.

  More specifically, as shown in FIG. 1, the drive cylinder (20) meshes with the ratchet mechanism (13) of the head portion (12) via the drive gear (22) formed on the peripheral surface, By switching the switching lever (14) of the ratchet mechanism (13), the rotation of the handle (11) is transmitted to the drive cylinder (20) only in one direction, and the drive cylinder (20) is idled in the other direction. .

Further, as shown in FIGS. 1 and 3, the socket (70) attached to the drive cylinder (20) has a rectangular mounting hole (71) that fits into the socket attachment part (21) of the drive cylinder (20). An insertion hole (73) into which a bolt or a nut is fitted is formed at the tip. The insertion hole (73) can be exemplified by hexagonal or twelve corners, and the socket (70) is prepared with an insertion hole (73) that matches the size of the bolt or nut.
The mounting hole (71) is formed with a concave groove (72) into which a retaining ball (50) described later for holding the socket (70) in the socket mounting portion (21) is fitted. In the illustrated embodiment, the recessed groove (72) is recessed on each surface of the attachment hole (71) having a rectangular cross section. Thereby, attachment can be performed without worrying about the direction of the rotation direction of the socket (70).

  The drive cylinder (20) has an insertion hole (30) formed in a direction along the axis, and a push rod (40) described later is embedded in the head (45) in the insertion hole (30). It is deployed slidable in the state.

  More specifically, the insertion hole (30) can be configured to include a plurality of steps, and has various different inner diameters. For example, as shown in FIG. 1, the insertion hole (30) has a presser to which a rod slide hole (31), a spring hole (32), a head slide hole (33), and a presser member (61) are attached from the distal end side. The diameter of the member mounting groove (34) and the retaining groove (35) to which the retaining member (63) is mounted increase in diameter, and the base end has a retaining member mounting groove so that the retaining member (61) can be inserted. (34) The aperture is reduced to the same diameter as that of (34). The spring hole (32) and the head slide hole (33) may have the same diameter.

  As shown in FIGS. 1 and 2, the drive cylinder (20) has a lateral hole (24) formed in a direction perpendicular to the axis of the drive cylinder (20) on the side surface of the socket mounting portion (21). Yes. A retaining ball (50) that engages with the socket (70) is accommodated in the lateral hole (24) so as to be able to roll or slide. The lateral hole (24) has a reduced outer diameter, and a part of the retaining sphere (50) protrudes from the socket mounting portion (21) to allow engagement with the socket (70). A stopper (25) is provided to prevent the retaining ball (50) from dropping outward.

  The retaining sphere (50) can be made of a steel ball, and its diameter protrudes from the side hole (24) in a state where it abuts on an extrusion recess (42) of a push rod (40) described later, It is engageable with the groove (72) of the socket (70), and is adjusted so as to be retracted into the lateral hole (24) when fitted into the relief recess (44) of the push rod (40).

  The push rod (40) is slidably inserted into the insertion hole (30) of the drive cylinder (20). As shown in FIGS. 1 and 2, the push rod (40) has an axial shape, more specifically, a cylindrical rod portion (41), and a circle with an enlarged diameter on the proximal end side of the rod portion (41). It has a plate-shaped head (45).

  The rod portion (41) has a shallow extruded recess (42) for extruding the retaining sphere (50) to protrude from the lateral hole (24) on the slightly distal end side in the length direction, and the extruded recess (42). A deep relief recess (44) that is recessed in the horizontal hole (24) by retracting the retaining sphere (50) through a tapered surface (43) that is continuous to the upper side of the shaft and inclined toward the axis. It is recessed.

  As shown in FIG. 1, the extrusion recess (42) is formed at a position facing the lateral hole (24) with the head (45) moved most upward, and the escape recess (44) is formed in FIG. And as shown in FIG. 4, it forms in the position which opposes a horizontal hole (24) in the state in which the push rod (40) was pushed.

  As shown in FIGS. 1 and 2, the push rod (40) is inserted into the insertion hole (30) with the spring (60) fitted to the rod portion (41), and is inserted into the holding member mounting groove (34). Install an annular holding member (61) such as a washer, and prevent the push rod (40) and the holding member (61) from coming out of the insertion hole (30) by the biasing force of the spring (60). ) Is fitted into the retaining groove (35) to be attached to the drive cylinder (20).

  More specifically, the spring (60) is a coil spring and biases the head (45) of the push rod (40) upward in the spring hole (32).

As shown in FIGS. 1 and 2, the presser member (61) is an annular plate material such as a washer, and prevents the head (45) biased by the spring (60) from moving upward, While holding the head (45) at a position recessed from the head (12), the center hole allows the head (45) to be pushed in using a thin jig (80) such as a screwdriver. It becomes an operation hole (62).
It is desirable that the operation hole 62 has a diameter of 10 mm or less, preferably 5 mm or less so as not to be erroneously operated by the user's finger. The pressing member (61) is not limited to an annular shape, and may be a screw or the like protruding from the insertion hole (30) as long as the movement of the head (45) of the push rod (40) can be prevented. In this case, it can also serve as a retaining member (63) described below.

  Further, as shown in FIG. 2, the retaining member (63) can be a retaining ring, and is attached to the retaining groove (35) by being contracted by pliers or tweezers.

  A method of attaching and detaching the socket (70) of the bolt fastening machine such as the ratchet handle (10) having the drive cylinder (20) having the above-described configuration will be described.

  As shown in FIG. 1, the drive cylinder (20) is in a state in which the push rod (40) hits the presser member (61) by the urging force of the spring (60) as shown in FIG. The push-out concave portion (42) of the rod portion (41) holds the retaining ball (50) out of the lateral hole (24) and prevents it from moving backward.

  As shown in FIG. 3, a small jig (80) such as a screwdriver is inserted into the operation hole (62), and the head (45) is pushed downward against the urging force of the spring (60) (see FIG. 3). 3 middle arrow A).

  When the head (45) is pushed in, the push rod (40) moves downward (arrow B in FIG. 3), the lateral hole (24) faces the relief recess (44), and the retaining sphere (50) It can be retracted toward the escape recess (44) (arrow C in FIG. 3).

  In this state, as shown by the arrow D in FIG. 3 and the arrow E in FIG. 4, when the socket (70) is inserted into the socket mounting portion (21), the retaining ball (50) hits the edge of the socket (70). Then, it moves backward to the relief recess (44) (arrow C in FIG. 4).

As shown in FIG. 5, the socket (70) is inserted until the concave groove (72) of the socket (70) faces the horizontal hole (24), and the push rod (40) is pushed in (80). Is removed, the push rod 40 is pushed up by the urging force of the spring 60 (arrow F in FIG. 5).
Thereby, the retaining sphere (50) rolls or slides on the tapered surface (43) from the escape recess (44) and is pushed out from the side hole (24) by the extrusion recess (42). The portion fits into the groove (72) of the socket (70) (arrow G in FIG. 5).

The socket (70) is attached to the drive cylinder (20) by fitting the retaining ball (50) into the groove (72) of the socket (70).
The retaining sphere (50) is not retractable due to the extrusion recess (42), and the push rod (40) is inoperable unless a small-diameter jig (80) is used. It is possible to prevent the socket (70) not to fall off.

  After attaching the socket (70), a desired bolt or nut can be fitted into the insertion hole (73) of the socket (70) to perform the fastening operation.

  To remove the socket (70), first, a small jig (80) such as a screwdriver is inserted into the operation hole (62) and the push rod (40) is pushed in (arrow A in FIG. 4). 24) and the relief recess (44) face each other. When the socket (70) is pulled out from this state in the direction of the arrow H in FIG. 4, the retaining ball (50) is detached from the concave groove (72) of the socket (70) and retreats toward the escape concave portion (44) ( Arrow C) in FIG.

  The socket (70) can be removed from the drive cylinder (20) by further pulling the socket (70) as shown by an arrow I in FIG.

  According to the present invention, since the push rod (40) cannot be operated unless the small-diameter jig (80) is used, the socket (70) is not unintentionally dropped, such as erroneous operation or hitting another member. Can be prevented.

  INDUSTRIAL APPLICABILITY The present invention can be widely used as a bolt fastening machine in which a socket does not unintentionally come off from a drive cylinder.

(10) Ratchet handle
(12) Head
(20) Drive cylinder
(21) Socket mounting part
(24) Horizontal hole
(40) Push rod
(41) Rod part
(42) Extrusion recess
(44) Recessed recess
(50) retaining ball
(61) Presser member
(62) Operation hole
(63) retaining member
(70) Socket
(80) Jig

Claims (3)

A head portion provided at the tip of the handle;
A drive cylinder attached to the head part and capable of being fitted with a socket fitted to a bolt and / or nut at the tip;
A push rod that fits in an insertion hole established in the axial direction of the drive cylinder and is slidable in the insertion hole;
A retaining sphere that can be projected and retracted from the side surface of the drive cylinder, and whose projection and depression are regulated by a push rod,
In the bolt tightening machine with
A bolt tightening machine, wherein the push rod is slidably arranged at a position recessed from the head part.   The bolt tightening machine according to claim 1, wherein the push rod is operated by a jig. The push rod has an axial rod portion and a head portion whose base end is enlarged in diameter, and is inserted into the insertion hole via a spring that biases the head portion toward the base end. ,
The insertion hole includes a pressing member that holds the head of the push rod at a position recessed from the head, and the pressing member has an operation hole that can operate the head of the push rod.
The bolt fastening machine according to claim 1 or 2.

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