Spanner or monkey spanner to which a force to only one direction

A spanner adapted for operative engagement with a hexagonal element, comprising a handle, jaws disposed at one end of the handle, the jaws defining first and second clamping surfaces and a contacting surface, the first clamping surface being continuous on one side of the jaws, the second, opposing clamping surface being disposed on the other side of the jaws, the second clamping surface being interrupted by a recessed portion which separates the second clamping surface into long and short clamping surfaces with the recessed portion being disposed therebetween, the contacting surface connecting the first and second clamping surfaces, whereby when the spanner is rotated in the clockwise direction the jaws engage the hexagonal element and when the spanner is rotated in the opposite direction, a protruding portion of the hexagonal element falls into the recessed portion, permitting the spanner to be repositioned for clockwise rotation.

BACKGROUND OF THE INVENTION 
The present invention relates to a spanner or monkey spanner to which a 
force can be applied in only one direction, wherein the jaws are 
constructed so that a force can be applied in only one direction for 
rotating the spanner for tightening or releasing an element such as a 
hexagonal head bolt or a hexagonal nut. 
In general, a spanner or a monkey spanner is used when tightening or 
releasing a tightening element such as a hexagonal head bolt or a 
hexagonal nut. However since the clamping jaws of the spanner are constant 
in dimension, when the element to be tightened is inserted into the 
clamping jaws, they first should be turned a predetermined rotating angle 
and thereafter removed and returned to their original position and then 
again inserted around the bolt or nut to repeat the procedure. This 
creates the disadvantage whereby the working procedure becomes 
inconvenient and slow. 
SUMMARY OF THE INVENTION 
The present invention inconvenience, and it is an object of the present 
provides a spanner or monkey spanner in which the jaws are specially made 
whereby the element to be tightened is inserted within the jaws and 
rotated in only one direction.

DETAILED DESCRIPTION OF THE INVENTION 
Hereinafter, the present invention will be described in more in detail with 
reference to the accompanying drawings. 
FIG. 1 to FIG. 4, show the structures of the spanner and monkey spanner of 
the present invention. 
The spanner of the present invention has jaws 4 formed by a clamping 
portion 2 formed at an end of the handle 1, clamping surfaces 201 and 205 
are formed on both sides of the jaw and a cut-out recess 203 is formed 
within the clamping surface 201 and 202 at one portion of the jaw. A 
hexagonal nut 6 or a hexagonal head bolt is clamped by the short clamping 
surface 202 and the opposite side clamping surface 205 so that the spanner 
can be rotated in a direction having no cut out recess 203. The monkey 
spanner of the present invention can also have a structure as shown in 
FIG. 3 and FIG. 4 wherein a movable jaw 3 is provided at one side of the 
clamping portion 2 formed at an end of the handle 1 forming movable type 
jaws 4. The cut out recess 203 is formed with the remaining a clamping 
surface 202 at a portion of the fixed clamping wall 201 of the clamping 
portion 2. A hexagonal nut or a hexagonal head bolt is clamped within the 
jaws 4 by the short clamping surface 202, the contacting surface 204 and 
the clamping surface 301 of the movable jaw 3. When the monkey spanner is 
rotated in opposite direction formed with the cut out recess 203, the 
tightening part clamped by the jaws can be rotated. 
In accordance with the present invention, when the hexagonal nut 6 is 
inserted into the jaws 4 of the spanner so that the protruding angle 601 
is maintained at a center of the contacting surface 204, since the 
clamping surface 602 of the hexagonal nut 6 is clamped by the clamping 
surface 205 and the clamping surface 202, as shown in FIG. 2, a force is 
applied when the spanner is rotated clockwise. On the other hand, the 
protruded angle 601 of the hexagonal nut 6 is positioned into the cut out 
recess 203 whereby the spanner is rotated in idle when the spanner is 
rotated counter clockwise. Thus the short clamping surface 202 makes 
contact with the next clamping surface 602. Accordingly, when the spanner 
is rotated in the clockwise direction the nut can be continuously rotated, 
and as in the case of the monkey spanner, when the hexagonal nut 6 is 
inserted into the movable jaws 4 and the clamping distance is adjusted 
whereby the protruded angle 601 of the nut 6 is maintained in the center 
of the contacting surface 204, the clamping surface 602 of the hexagonal 
nut 6 is clamped between the clamping surface 301 of the movable jaw 3 and 
the clamping surface 202 of the clamping portion 2 as shown in FIG. 4. 
Thus, the spanner can continuously rotate the nut 6 in the clockwise 
direction, and when the spanner is rotated to its opposite direction, the 
protruding angle 601 of the hexagonal nut 6 falls into the cut out recess 
203 whereby the spanner rotates in idle. 
Accordingly, in the state where the hexagonal nut 6 is inserted into the 
jaws 4, a force is applied only when the monkey spanner is rotated in a 
direction opposite from the clamping portion containing the cut out recess 
203 whereby the hexagonal nut can be tightened. When it is desired release 
the nut, the hexagonal nut can be released by rotating the monkey spanner 
by clamping after turning over the clamping portion of the monkey spanner. 
Therefore, in the monkey spanner of the present invention, since the nut is 
clamped within the jaws of the monkey spanner and can be tightened or 
released by rotating the monkey spanner in only one direction, opperative 
process becomes speedy convenient, and particularly because a cut out 
recess is provided in the fixed clamping wall.