JP2013215837A - Hand-held nut runner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand-held nut runner capable of carrying a plurality of bolts, not needing to supply a new bolt until completely using the same, eliminating time loss by supplying in each case, shortening working time and enhancing working efficiency.SOLUTION: A hand-held nut runner comprises a body 1 having a rotary driving section 3 and a cartridge 2 rotatably and detachably installed in the body 1 and rotated and driven by the rotary driving section 3, the cartridge 2 has a socket 6 into which a bolt 5 fits in the front end part thereof, the plurality of bolts 5 is loaded in the cartridge 2 while being pushed from behind the same, usually the bolt 5 is engaged with an engaging means 13 arranged in the socket 6 when being fitted in the socket 6 and is prevented from coming off from the socket 6, the bolt 5 is fastened by the cartridge 2 being rotated and driven by the rotary driving section 3, and is released from an engaging condition by the engaging means 13, and comes off from the socket 6.

Description

  The present invention relates to a handheld nutrunner, and more particularly to a handheld nutrunner used for tightening or loosening bolts or nuts in, for example, an assembly operation in an automobile manufacturing factory. is there.

  A handheld nutrunner, which is an electric tool for tightening or loosening bolts or nuts by hand-held work, is widely used in assembly work and the like in an automobile manufacturing factory. A conventional general handheld nutrunner is composed of a grip handle and a housing with a built-in drive motor, and is connected to the drive motor at the front end of the housing and is fitted with a bolt or nut by the drive motor. A rotationally driven socket is provided. The operator manually fits the bolt or nut into the socket, puts the switch on the nut, female thread, or bolt shaft to be screwed, and inserts the bolt or nut in the socket into the screw. Screw onto the target.

  However, in the case of the conventional nut runner described above, it is necessary to manually fit the bolts and nuts into the socket one by one for each screwing operation, and the work time is prolonged accordingly. Work efficiency was poor.

JP 2009-160719 A JP 2000-176852 A Utility Model Registration No. 3128539

  As described above, in the case of a conventional hand-held nutrunner, there is an annoyance that an operator has to manually fit a nut or bolt into a socket one by one for each tightening operation. Minute work time was prolonged, which contributed to a decrease in work efficiency.

  The present invention has been made to solve such a problem in the conventional handheld nutrunner, and can carry a plurality of bolts or nuts, and a new bolt until all of the plurality of bolts or nuts are used up. Or, since there is no need to supply a nut, it is possible to eliminate a time loss caused by supplying the nut each time, and thus to provide a handheld nutrunner that can shorten the working time and improve the working efficiency. This is the issue.

  The invention described in claim 1 for solving the above-mentioned problems comprises a main body provided with a rotation drive unit and a cartridge which is rotatably and detachably mounted on the main body and is driven to rotate by the rotation drive unit. The cartridge has a socket in which a bolt or a nut is fitted at the tip, and a plurality of bolts or nuts are loaded in the cartridge in the boosted state. It is locked by locking means attached to the socket to prevent the socket from falling off, and the bolt or nut is tightened when the cartridge is rotationally driven by the rotary drive unit, and the locking It is a handheld nutrunner that is released from the locked state by means and comes out of the socket.

  In one embodiment, the rotational drive unit includes a drive motor, a drive gear that is rotationally driven by the drive motor, and a driven gear that meshes with the drive gear and receives a rotational drive force. Is driven to rotate by being attached to the shaft of the driven gear. Further, the cartridge receives a rotational driving force from the driven gear via a pair of one-way clutches facing in opposite directions, which are built in the shaft portion of the driven gear.

  In one embodiment, the plurality of bolts loaded in the cartridge are urged forward by a spring-loaded end cap fitted in the rear end of the cartridge, or a screw disposed in the cartridge. Feeded forward by the feeder. In one embodiment, the main body has a grip handle, an activation switch of the drive motor is disposed on the grip handle, and the rotation drive unit of the main body is a hollow motor.

  The present invention is as described above, and in the handheld nutrunner according to the present invention, a cartridge carrying a plurality of bolts or nuts is set to be replaceable, and the bolts or nuts in the cartridge are loaded in a boosted state. Therefore, since the second bolt or nut is automatically supplied to the head position at the same time as the tightening of the head bolt or nut is completed, it is necessary to supply a new bolt or nut until the bolt or nut in one cartridge is used up. In addition, it is possible to eliminate the inconvenience and time loss that must be supplied manually for each tightening operation, thereby reducing work time and improving work efficiency.

It is a fragmentary sectional front view of one embodiment of the handheld nutrunner concerning the present invention. It is a side view of embodiment shown in FIG. It is the longitudinal cross-sectional view and top view which show the structure of the cartridge in the handheld type nut runner shown in FIG. It is the side view which shows the structure of the cartridge in the handheld nutrunner shown in FIG. 1, and the sectional view on the AA line and BB line in FIG. It is a front view of the unloaded state of the end cap with a spring accommodated in the cartridge in the handheld nutrunner shown in FIG. It is a fragmentary sectional front view of other embodiments of the handheld nutrunner concerning the present invention. FIG. 7 is a side view of the embodiment shown in FIG. 6. It is a perspective view which shows the socket part of the cartridge in embodiment shown in FIG. FIG. 7 is a sectional view taken along line CC and line DD in FIG. 6. It is a figure which shows the screw feeder for feeding the volt | bolt in the cartridge in the handheld nutrunner which concerns on this invention ahead.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the accompanying drawings. The handheld nutrunner according to the present invention includes a main body 1 having a rotation drive unit and a cartridge 2 that is rotatably and detachably mounted on the main body 1 and is driven to rotate by the rotation drive unit.

  First, the embodiment shown in FIGS. 1 to 5 will be described. The cartridge 2 has a pipe shape made of metal or hard resin, and a plurality of bolts 5 or nuts (hereinafter simply referred to as bolts 5) are in a boosted state. (In the case of a bolt, it is loaded so that the head faces backward). The tip of the cartridge 2 is usually a socket 6 having a hexagonal cross section, into which one or two bolts 5 are fitted. The socket 6 may be provided by processing the tip portion of the cartridge 2 or may be fixed separately.

  The socket 6 is provided with locking means for locking the leading bolt 5 in the socket 6, and the leading bolt 5 is held in the socket 6 by the locking means, and will be described later. When the bolt 5 is rotationally driven, the bolt 5 is screwed into the other party (nut, bolt or female thread engraved portion) and advances, and eventually comes out of its locked state and comes out of the socket 6. For this reason, the locking force of the locking means must be superior to the urging force against the bolt 5, while being inferior to the screwing force after being screwed to the other side of the bolt 5.

  The locking means in the illustrated example is a pair of locking arms 13 whose rear end is pivotally supported by the socket 6 and whose tip is urged inward by spring pressure. The pair of locking arms 13 always try to close the tip end by spring pressure, and thus act to lock the head of the bolt 5.

  Each bolt 5 loaded in the cartridge 2 is always urged to the front end side by a spring-loaded end cap 7 provided at the rear end portion of the cartridge 2. The end cap 7 with a spring includes a pusher 8 and a tail plug 9 that are fitted into the cartridge 2, and a spring 10 that is disposed between the pusher 8 and the tail plug 9. Preferably, a protrusion 11 is provided on the peripheral side surface of the tail plug 9, and the protrusion 11 is slidable along a locking groove 12 formed in the rear end portion of the cartridge 2. For example, the locking groove 12 is formed in a J-shape, and the protrusion 11 is locked to the locking groove 12 and is held in that position by proceeding to the innermost part of the locking groove 12.

  In this way, the protrusion 11 is advanced to the innermost part of the locking groove 12 and the protrusion 11 is locked at that position, whereby the tail plug 9 is fixed to the rearmost part of the cartridge 2, Omission is prevented. Along with this, the pusher 8 that contacts the rearmost bolt 5 is pressed by the elastic force of the spring 10, so that each bolt 5 in the cartridge 2 is always urged toward the front end side.

  The main body 1 in the illustrated embodiment includes a motor interior portion 15 that houses a drive motor 14 and a grip handle 16 that extends below the motor interior portion 15. An activation switch for the drive motor 14 is connected to the grip handle 16. 17 is provided and generally exhibits a pistol shape. A bearing holder 19 is installed at the end of the motor interior portion 15, and a driving gear 21 and a driven gear 22 that mesh with each other are supported by the bearing holder 19. The front end portion of the drive motor 14 faces the bearing holder 19, and its output shaft is connected to the drive gear 21. The cartridge 2 is inserted into the hollow shaft portion of the driven gear 22 so as to be detachable.

  The cartridge 2 is made detachable via a pair of one-way clutches 24 and 25 that are built in the shaft portion 23 of the driven gear 22. The pair of one-way clutches 24 and 25 are opposed to each other in the opposite direction so as to act in the reverse rotation direction. Thus, the cartridge 2 rotates integrally with the driven gear 22 without idling. A step portion 2 a is formed in the cartridge 2, and positioning is performed when the step portion 2 a hits the one-way clutch 24 when the cartridge 2 is fitted into the shaft portion 23.

  The illustrated cartridge 2 is a relatively short cartridge that houses six bolts 5, but can be a long cartridge that accommodates more bolts 5. In that case, a motor can be used as necessary. A cartridge receiver is provided on the upper surface of the interior portion 15.

  In the handheld nutrunner according to the present invention configured as described above, the work preparation is completed by fitting the cartridge 2 containing a predetermined number of bolts 5 into the shaft portion 23 of the driven gear 22. At the time of work, like the general nut runner, the start switch 17 is turned on with the tip of the cartridge 2, that is, the tip of the bolt 5 protruding from the socket 6, facing the tightening partner. Accordingly, when the drive motor 14 is started and the drive gear 21 is rotationally driven, the rotation is transmitted to the driven gear 22 meshing therewith, and the cartridge 2 integrated with the driven gear 22 is rotated. Thus, the head bolt 5 is screwed onto the screwing partner, and gradually advances to become a tightened state and comes out of the socket. This operation can be continuously performed until the bolts 5 in the cartridge 2 are used up.

  Next, a second embodiment shown in FIGS. 6 to 9 will be described. In the second embodiment, the drive unit is disposed on the upper side of the cartridge 2 that is rotatably supported by the main body 1. Although not shown, a rechargeable battery and wiring are housed in the main body 1 and a start switch 17 is installed. A motor bracket 32 that supports the drive motor 14 and supports the cartridge 2 and an auxiliary bracket 33 that supports the cartridge 2 are disposed in the upper case 31 of the main body 1.

  More specifically, the motor bracket 32 includes a shaft support tube 34 that receives and supports the rear end portion of the cartridge 2. A step is formed in the cartridge 2, and the motor bracket 32 is pushed in until the step contacts the bearing of the shaft support tube 34. Is positioned. The auxiliary bracket 33 is fitted with the other half of the receiving cylinder 35 in which one one-way clutch 24 is fitted in one half. The rotational driving force of the drive motor 14 is decelerated and transmitted from the drive gear 21 to the driven gear 22, and the cartridge 2 fitted in the driven gear 22 is rotationally driven, as in the above embodiment. .

  The cartridge 2 may have the same configuration as that described in the first embodiment, but the illustrated configuration is a socket portion including a bolt locking means and an end cap 7 with a spring. The structure of the means for locking the end portion of this is different from that described above. That is, in this embodiment, a socket element including a socket cylinder 36 and a socket piece 38 fitted into the socket cylinder 36 is installed at the tip end of the cartridge 2. One or a plurality of grooves into which the O-ring 37 is fitted are formed on the outer peripheral surface of the socket cylinder 36, and a hexagon hole 38a corresponding to the shape and size of the head of the bolt 5 is provided in the socket piece 38. . In place of the O-ring 37, a C-ring partly separated can be used.

  Typically, two grooves on the outer peripheral surface of the socket cylinder 36 are formed, and for example, three leaf springs 39 that are means for locking the leading bolt 5 on the outer peripheral surface of the socket cylinder 36 using these grooves, Mounted at equal angles. The leaf spring 39 is formed with a semicircular recess 39b that fits into the groove at the groove-corresponding position, and an intermediate part thereof is bent at a right angle along the end surface of the socket cylinder 36. The distal end portion is folded back to form a locking portion 39a having a triangular shape. The leaf spring 39 is fixed to the end of the socket cylinder 36 by fitting the recessed portion 39b into the groove and fitting the O-ring 37 into the recessed portion 39b. In the fixed state, the locking portion 39a at the tip of each leaf spring 39 faces the hexagonal hole 38a (see FIG. 8).

  Thus, the leaf spring 39 is engaged with the outer recessed portion 39b fitted in the groove and tightened by the O-ring 37, and the engagement portion 39a becomes movable, and the engagement portions of the three leaf springs 39 are engaged. The bolt 5 is locked by the cooperation of 39a. That is, during normal times, the locking portions 39a of the three leaf springs 39 are closed, and the urging force of the spring of the end cap 7 with the spring is overcome and the head of the bolt 5 is locked. Never get out of 2.

  Then, with the screwing operation, the leading bolt 5 is screwed onto the screwed counterpart and the tightening state is reached, and the leading bolt 5 overcomes the locking force by the locking portions 39a of the three leaf springs 39. The socket piece 38 is pulled out. The locking portion 39a that has released the head bolt 5 in this way immediately returns to its original closed state by its own restoring force, and is biased by the spring-loaded end cap 7 and is second from the head that fits in the socket piece 38. The bolt 5 is received by the locking force and is held in that position. Thereafter, the screwing operation can be continuously performed until the bolts 5 in the cartridge 2 are eliminated.

  In the example shown in FIG. 6, a fastening collar 41 is used to fix the end cap 7 with a spring to the end of the cartridge 2. That is, after a predetermined number of bolts 5 and a spring-loaded end cap 7 are loaded into the cartridge 2, the clamping collar 41 is fitted and tightened with the tail plug 9 being held down, whereby the spring-loaded end cap 7 is removed. To prevent.

  FIG. 10 shows still another configuration example of the cartridge 2, and in this example, a screw feeder configuration is adopted as an automatic advance means of the bolt 5 in the cartridge 2. That is, a feed screw 42 that rotates together with the cartridge 2 is arranged in the cartridge 2, and the bolt 5 moves forward with the rotation of the feed screw 42 by engaging the head with the feed screw 42.

  Although the invention has been described in some detail with its most preferred embodiments, it is evident that a wide variety of embodiments can be constructed without departing from the spirit and scope of the invention. For example, a hollow motor or the like can be employed as a drive motor in addition to a general DC motor. Accordingly, the invention is not limited to that particular embodiment, except as limited in the appended claims.

DESCRIPTION OF SYMBOLS 1 Main body 2 Cartridge 3 Rotation drive part 5 Bolt 6 Socket 7 End cap 8 with a spring 8 Pusher 9 Tail plug 10 Spring 11 Projection 12 Locking groove 13 Locking arm 14 Drive motor 15 Motor loading part 16 Grip handle 17 Start switch 19 Bearing Holder 21 Drive gear 22 Driven gear 23 Shaft part 24, 25 One-way clutch 31 Upper case 32 Motor bracket 33 Auxiliary bracket 35 Receptacle 36 Socket cylinder 37 O-ring (C-ring)
38 Socket piece 39 Leaf spring 41 Tightening collar

Claims (7)

A main body provided with a rotation drive unit, and a cartridge that is rotatably and detachably mounted on the main body and is driven to rotate by the rotation drive unit,
The cartridge has a socket in which a bolt or a nut is fitted at the tip, and a plurality of bolts or nuts are loaded in the cartridge in a boosted state, and the bolt or the nut is normally inserted into the socket when fitted in the socket. The bolt or nut is locked by the locking means attached to the socket to prevent the socket from coming off, and the bolt or nut is tightened by the cartridge being driven to rotate by the rotary drive unit, and the locking means A hand-held nutrunner that is released from the locked state by detaching from the socket.   The rotational drive unit includes a drive motor, a drive gear that is rotationally driven by the drive motor, and a driven gear that meshes with the drive gear and receives a rotational driving force, and the cartridge includes a driven gear. The handheld nutrunner according to claim 1, wherein the handheld nutrunner is driven to rotate by being attached to the shaft portion.   3. The handheld nutrunner according to claim 2, wherein the cartridge receives a rotational driving force from the driven gear via a pair of oppositely facing one-way clutches built in a shaft portion of the driven gear.   4. The handheld nutrunner according to claim 1, wherein a plurality of bolts loaded in the cartridge are urged forward by a spring-loaded end cap fitted in a rear end portion of the cartridge. 5. .   The handheld nutrunner according to any one of claims 1 to 3, wherein the plurality of bolts loaded in the cartridge are fed forward by a screw feeder provided in the cartridge.   The handheld nutrunner according to any one of claims 1 to 5, wherein the main body includes a grip handle, and an activation switch of the drive motor is disposed on the grip handle. The handheld nutrunner according to any one of claims 1 to 6, wherein the rotation drive unit of the main body is a hollow motor.

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