JPH0314272Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a tool for tightening bolts and nuts.

(Prior Art) Conventionally, bolt/nut tightening tools (hereinafter referred to as bolt/nut runners) generally use magnets or vacuum to hold bolt heads or nuts in sockets.

(Problem that the invention attempts to solve) However, in both cases, the holding power is weak;
When applied to large diameter and/or long bolts, there was a drawback of low reliability. Furthermore, in those using magnets, reliability was also reduced due to adhesion of iron powder, etc. On the other hand, the applicant of the present application previously provided a bolt/nut runner with a highly reliable holding mechanism utilizing torque in Utility Application No. 59-42579. However, this has the problem of insufficient holding and tightening surface for small diameter bolts due to the low height of the bolt head or side surface of the nut.

The purpose of this invention is to provide a bolt/nut runner with a highly reliable retention mechanism using torque, which can be applied to bolts with a small diameter of M8 or smaller.

(Means for solving the problem) In order to achieve the above object, this invention attaches a socket for a hexagon head bolt to one end of a rotating shaft, and rotatably supports the rotating shaft with a bearing housing attached to a base. and a bolt-nut runner that connects the drive shaft of the motor attached to the base to the other end of the rotating shaft, the bolt-nut runner having a notched groove formed by cutting out a pair of opposing walls of the hexagonal hole of the socket. , a sleeve rotatably inserted into the outer periphery of the socket and the lower end of the rotating shaft following the socket; a pair of protrusions protruding from the inner surface of the sleeve so as to leave a certain gap in the width direction and fill the notch groove; A pair of slanted grooves are cut out in the other end wall of the sleeve at a certain angle with respect to the center of rotation, and the sleeve is inserted into a hollow part provided in the rotating shaft and reciprocated along the axis using compressed air. a piston attached to the piston and inserted into a hole extending to the lower end of the rotating shaft; and a rod that protrudes from both sides of the lower part of the rod and engages with the inclined groove of the sleeve through a through groove drilled on the side of the rotating shaft. This is a bolt/nut runner with a holding mechanism, which is characterized by having a matching pin.

(Operation) When a bolt or nut is inserted into the socket and the piston is pushed up by compressed air, the pin engaged with the slanted groove of the sleeve moves in the axial direction and rotates the sleeve by a small angle, causing the protrusion of the sleeve to push up against the bolt. Tighten and hold the head or nut. In this state, operate the motor and tighten the bolts.

(Example) This invention will be described below based on drawings showing examples. In the figure, 1 is a socket, and one end of the socket 1 has a hexagonal hole 2 into which a hexagonal head bolt or nut is inserted. A pair of opposing wall surfaces of the hexagonal hole 2 are cut out to the outer periphery of the socket 1 to form a groove 3. A square hole 4 is machined at the other end of the socket 1, and the square hole 4 is fitted into a square projection 6 machined at one end of a rotating shaft 5, and fixed with a bolt 7.

The rotating shaft 5 is rotatably supported by a bearing housing 9 attached to a base 8 via a bearing 10. Also, a motor 11 is attached to the base 8.
The drive shaft 12 connects to the rotating shaft 5 via a universal joint 13.
is engaged with the other end. When the drive shaft 12 rotates, the socket 1 also rotates.

Socket 1 and the lower end portion 5a of the rotating shaft following it
A sleeve 14 is inserted into the outer periphery of the socket 1, and a circlip 15 is inserted so as to be rotatable relative to the socket 1.
It is attached with. A pair of protrusions 16 are provided on the inner surface of the sleeve 14 facing the groove 3 of the socket 1. As shown in FIG.
The width of the groove 3 is smaller than that of the groove 3. A pair of inclined grooves 17 are formed on the other end wall of the sleeve 14 at a constant angle θ with respect to the center of rotation of the sleeve 14 .

Further, the rotary shaft 5 is provided with a hollow portion 21 including the axial center, into which a piston 22 is inserted, and air chambers 21a and 21b are formed on both sides of the hollow portion 21. Air chamber 2
1a and 21b communicate with air inlets 23 and 24 provided in the bearing housing 9, respectively. As a result, when compressed air is supplied from the air inlets 23 and 24, the piston 22 reciprocates up and down in the drawing. A rod 25 is attached to the lower end of the piston 22, and is slidably inserted into a hole 26 extending from the hollow portion 21 along the axis to the lower end 5a of the rotating shaft. A pin 27 protruding from both sides is attached to the lower part of the rod 25. A sleeve 14 is provided on the side of the lower end portion 5a of the rotating shaft.
A through groove 28 is provided parallel to the axis at a position corresponding to the inclined groove 17 . Both protruding parts of the pin 27 are inserted into the grooves 28 and 17, and a roller 29 is inserted into the protruding part of the pin 27, and a roller 30 is inserted into the outer part of the pin 27. 28 and 17.

Therefore, when the piston 22 is operated by being supplied with compressed air, and the pin 27 moves upward or downward together with the rod 25, the pair of inclined grooves 17 of the sleeve 14 are rotated at an angle θ with respect to the center of rotation of the sleeve 14. , the sleeve 14 rotates at a constant angle with respect to the socket 1.

Next, the operation of the bolt-nut runner with a holding mechanism constructed as described above will be explained. First of all
As shown in the figure, when the bolt or nut is not held, the piston 22 is at its lowest position and the pin 27 is also at the lower end of the grooves 28 and 17. As shown in FIG. 2, the sleeve 14 is located at the left-hand rotation end, and the protrusion 16 is located outside the hexagonal hole 2.

When holding a bolt or nut, insert the bolt or nut (not shown) into the hexagonal hole,
Compressed air is supplied from the air inlet 24. Then, the piston 22 moves upward in the figure, and the rod 2
5 and the pin 27 moves upward along the grooves 28 and 17. As the pin 27 moves, the sleeve 14 rotates by a small angle in the right direction, that is, clockwise, as viewed from the direction of arrow A, due to the action of the groove 17 having an angle θ with respect to the center of the rotation axis. As the sleeve 14 rotates, the protrusion 16 is displaced within the groove 3 and protrudes into the hexagonal hole 2 by a minute amount.
This protruding protrusion 16 rotates the bolt or nut inserted into the hexagonal hole 2 clockwise, and the protrusion 16 also presses the hexagonal head of the bolt or the side surface of the nut against the periphery of the hexagonal hole 2 of the socket 1. ,
Fix the bolt or nut to socket 1.

When the sleeve 14 fixes the bolt or nut to the socket 1, the base 7 is fixed by means not shown.
While moving downward, the drive shaft 1 of the motor 11
2 rotates to tighten the bolt or nut to an object (not shown). When the tightening is completed, the compressed air in the air inlet 24 is shut off, and the air inlet 2
Supply compressed air from 3. As a result, in the reverse order to the above, the sleeve 14 rotates to the left when viewed from the direction of arrow A, releases the fixation between the socket 1 and the bolt or nut, and the base 7 returns to its original state, completing the bolt installation. .

(Effect of the invention) Since this invention is a bolt/nut runner with a holding mechanism configured as explained above, the protrusion of the sleeve acts on the entire height of the bolt head or the side of the nut, so it can be used even for small diameter bolts. This has the effect of making it possible to exhibit a highly reliable holding force.

[Brief explanation of drawings]

The figures show an embodiment of this invention, in which Figure 1 is a partially cutaway front view, Figure 2 is an end view seen from the direction of arrow A,
FIG. 3 is a partial side view seen from the direction of arrow B. 1... Socket, 2... Hexagonal hole, 3... Notch groove, 5... Rotating shaft, 9... Bearing housing, 11... Motor, 14... Sleeve, 17
... Inclined groove, 21 ... Hollow part, 22 ... Piston, 25 ... Rod, 27 ... Pin, 28 ... Penetration groove.

Claims (1)

[Scope of utility model registration request] A socket for a hexagon head bolt is attached to one end of the rotating shaft, the rotating shaft is rotatably supported by a bearing housing attached to a base, and a drive shaft of a motor attached to the base is coupled to the other end of the rotating shaft. Being a Boltnut Runner,
A notch groove formed by cutting out a pair of opposing walls of the hexagonal hole of the socket, a sleeve rotatably inserted around the outer periphery of the lower end of the rotating shaft following the socket, and a width extending from the inner surface of the sleeve. a pair of protrusions protruding so as to fill the notched groove leaving a certain gap in the direction; and a pair of inclined grooves cut out in the other end wall of the sleeve at a certain angle with respect to the center of rotation thereof. , a piston inserted into a hollow part provided in the rotating shaft and reciprocated along the axis by compressed air, a rod inserted into a hole attached to the piston and extending to the lower end of the rotating shaft, and a rod on both sides of the lower part of the rod. A bolt-nut runner with a holding mechanism, characterized in that a pin is provided which protrudes and engages with an inclined groove of the sleeve through a through groove formed on a side of the rotating shaft.