JP2019038094A - monkey wrench - Google Patents

Abstract

To provide a monkey wrench with a movable jaw set at a predetermined position in which the movable jaw remains stationary to keep an open width unchanged during tightening/loosening a bolt or a nut of an article to be held.SOLUTION: A monkey wrench comprises: a body 12 marked with a scale 20 indicating an open width W; a movable jaw 13 formed with a female thread 14 in a root part; and an adjustment member 15 formed with a male thread 16, in which the female thread 14 and the male thread 16 are screwed together in a self-locking state. The adjustment member 15 is turned to slide the movable jaw 13 so as to set the movable jaw 13 at a predetermined position.SELECTED DRAWING: Figure 1

Description

  The present invention has an opening width portion formed by a fixed jaw integrated with a main body and a movable jaw arranged so as to be slidable on the main body. The present invention relates to a monkey wrench used for tightening clamps.

  The adjustable wrench has an opening width portion (fixed jaw and movable) formed by a fixed jaw integral with the main body and a movable jaw disposed in the main body so as to be slidable toward and away from the fixed jaw. Tighten the object to be clamped by clamping the two-sided width (hexagonal width) part of the bolt (mainly hexagon bolt) or nut (mainly hexagon nut) of the object to be clamped at the gap between the jaws Used for loose work.

  A conventional monkey wrench meshes with a worm that is pivotally arranged on the main body and a rack that is engraved on the movable jaw. By rotating the worm, the movable jaw is slid. The position of the movable jaw is set so that the required opening width is obtained.

  Patent Document 1 discloses a technology for setting a movable jaw at a required position and simultaneously preventing displacement by fitting a protruding portion of a leaf spring portion fixed to the movable jaw into a fitting recess formed in a wrench body. Is done.

  In Patent Document 2, a scale indicating the opening width is engraved on the wrench body, and a locking ball disposed on the movable jaw and biased by a spring is locked by a locking recess formed in the wrench body, A technique for locking and setting a movable jaw at a required position is disclosed.

JP2013-82046A Shokai 60-194469

  In the conventional monkey wrench, the worm constituting the sliding mechanism of the movable jaw is not sufficiently self-locking, so when tightening the bolt or nut of the object to be clamped, the tightening force is applied to the movable jaw and the movable jaw is If a force to spread is generated, the movable jaw will move from the set position and the opening width will change, so it will not be possible to properly clamp the bolts and nuts of the object to be clamped, hindering the tightening work. Problem occurs.

  Therefore, in Patent Document 1, the protrusion of the leaf spring portion fixed to the movable jaw is fitted into the fitting recess formed in the wrench body, and the movable jaw is set at a required position and at the same time the bolt of the object to be clamped It tries to prevent the movable jaw from moving when the nut is tightened.

  Here, when the leaf spring is not strong, the movable jaw can slide easily and the opening width can be set easily, but the movable jaw does not move from the set position when tightening the bolt or nut of the object to be clamped. In order to do so, it is necessary to increase the strength of the leaf spring, and there is a problem that the operation of sliding the movable jaw becomes difficult.

  Further, in Patent Document 2, a locking ball urged by a spring is locked in a recess provided in a wrench body, and the movable jaw is locked and set at a required scale position, and at the same time, It is trying to prevent the movable jaw from moving when bolts and nuts are tightened.

  Here, when the urging force of the spring is not strong, the movable jaw can slide easily and the opening width can be set easily, but the movable jaw does not move from the set position when tightening the bolt or nut of the object to be clamped In order to do so, it is necessary to increase the urging force of the spring to the locking ball, and there is a problem similar to that of Patent Document 2 in which it becomes difficult to operate the movable jaw.

  In view of the above-mentioned problem of the monkey wrench, the present invention provides an opening that is set without moving the movable jaw even when a force is applied to widen the movable jaw by the tightening force when tightening the bolt or nut of the object to be clamped It relates to an adjustable wrench whose width does not change.

  In the monkey wrench of the present invention that solves the above problems, an opening width portion is formed by a fixed jaw integrated with a main body and a movable jaw that is slidably disposed on the main body, and bolts and nuts are formed in the opening width portion. In a monkey wrench used to clamp an object to be clamped and used to tighten and tighten the object to be clamped, the main body has the movable jaw having a female threaded portion at the base and a male screw that is screwed with the female screw. An adjustment member provided so as to be rotatable, the movable jaw is slid by rotating the adjustment member, the movable jaw is set at a position where the required opening width is reached, and a bolt or nut is sandwiched The female screw and the male screw are screwed with a self-locking function so that the movable jaw does not move from the set position even if a tightening force is applied to the movable jaw when the object is tightened. It is characterized by.

  In the monkey wrench configured as described above, the opening width of the movable jaw is widened even when a force to expand the movable jaw is applied to the movable jaw by the tightening force when the bolt or nut of the object to be clamped is loosened. Since there is no movement in the direction, the set opening width never changes.

It is the front view which carried out the cross section and showed the principal part of the monkey wrench which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is the front view which showed the state which marked the scale on the main body outer surface of the monkey wrench which concerns on the 1st Embodiment of this invention.

  Embodiments of a monkey wrench according to the present invention will be described with reference to the accompanying drawings.

  1 to 3 show a first embodiment of the present invention, FIG. 1 is a front view showing a cross section of the main part of the monkey wrench, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a front view showing a state in which a scale is engraved on the outer surface of the main body of the adjustable wrench.

  As shown in FIGS. 1 to 3, the adjustable wrench 10 includes a main body 12, a fixed jaw 11 integral with the main body 12, a movable jaw 13 slidably disposed on the main body 12, and a main body 12. And an adjustment member 15 arranged in a rotatable state.

  The base side of the main body 12 is a grip 17 that an operator grips when tightening or tightening the bolts or nuts of the object to be clamped. A fixed jaw 11 is formed at the tip of the main body 12. A sliding hole 18 communicating with the slit 19 is recessed, and the root portion of the movable jaw 13 is inserted in the sliding hole 18 in a slidable state, and is opened by the fixed jaw 11 and the movable jaw 13. A width W is formed.

  A female screw 14 is formed at the root of the movable jaw 13, and a male screw 16 is formed on the adjustment member 15. The female screw 14 and the male screw 16 are screwed in a state having a self-locking function. The movable jaw 13 slides by rotating the adjusting member 15.

If the lead angle of the female screw 14 and the male screw 16 that are screwed together in the self-locking function state is small, the self-locking property is improved. When the jaw 13 is set at a required position, the number of rotations of the adjustment member 15 increases and it takes time to operate.
On the other hand, if the lead angle of the female screw 14 and the male screw 16 is large, the self-locking property is inferior.

The lead angle of the female screw 14 and the male screw 16 is exemplified by 0.5 ° to 4 °, depending on the conditions of the threaded portion and the adjustment member 15.
Examples of the thread shape include a triangular screw, a square screw, and a trapezoidal screw.

As shown in FIG. 3, the scale 20 marked on the outer surface of the main body 12 corresponds to the opening width W.
The scale 20 may be indicated by the number of the width of the bolt or nut itself, may be indicated by the size of the bolt or nut, or both may be indicated.

  Accordingly, by turning the adjustment member 15 while looking at the scale 20 engraved corresponding to the opening width W, the movable jaw 13 is placed at a required position corresponding to the two surface widths of the bolt and nut of the object to be clamped. Easy to set.

  Since the female screw 14 and the male screw 16 have a self-locking function, even if a force to expand the movable jaw 13 is applied when the bolt or nut of the object to be clamped is tightened, the movable screw 13 moves to the movable jaw 13 set at a required position There is nothing and the opening width does not change.

  Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. It should also be noted that not all the features described in the implementation are necessarily essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 10 Monkey wrench 11 Fixed jaw 12 Main body 13 Movable jaw 14 Female screw 15 Adjustment member 16 Male screw 17 Grip 18 Sliding hole 19 Slit 20 Scale

Claims (1)

An opening width portion is formed by a fixed jaw integrated with the main body and a movable jaw slidably disposed on the main body, and the object to be clamped such as a bolt or a nut is held by the opening width portion, and the object to be clamped In the adjustable wrench used for tightening
The movable jaw having a female screw portion formed at the base portion, and an adjustment member provided with a male screw threadably engaged with the female screw and provided rotatably on the main body,
By rotating the adjusting member, the movable jaw is slid, the movable jaw is set at a position where the required opening width is obtained, and the tightening force is applied to the movable jaw when the bolt or nut is clamped. A monkey wrench, wherein the internal thread and the external thread are screwed with a self-locking function so that the movable jaw does not move from the set position even when it is hooked.

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