JP3712973B2 - Pruning shears lock mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention holds a pair of blades in a closed state in a pruning shear that supports two blades by a center shaft and cuts a tree branch or the like by opening and closing a grip handle at the base of the center shaft. The invention relates to a locking mechanism.
[0002]
[Prior art]
A lock mechanism that keeps a pair of blades closed even in a conventional pruning shear that supports two blades with a center shaft and cuts a tree branch by opening and closing the base grip handle Has been. As a conventional locking mechanism, a locking belt is provided at the proximal end portion of the grip handle and the belt is hooked in a closed state, or the blade body is opened and closed at the base end portion of one grip handle A as shown in FIG. A method is known in which a hook hook C that pivots in the direction is attached to a shaft, and a hook claw D formed at the tip of the hook hook C is engaged with the handle bottom E of the other gripping handle B.
[0003]
[Problems to be solved by the invention]
As in the prior art, a stopper mechanism that hangs the belt on the proximal end of the gripping handle with a pair of blades closed, or a hook ridge C provided on the handle bottom portion of one gripping handle A as shown in FIG. In the mechanism for directly engaging the hook nail D with the handle bottom E of the other handle B, there is a drawback in that work efficiency is poor because both hands need to be used when engaging and disengaging. In view of such circumstances, for example, even if one hand is occupied during the work, it can be taken out with the other hand and the pruning work can be performed, or it can be locked in the state held in the hand after the pruning work. An object of the present invention is to provide a pruning shear with excellent operability.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, pruning is performed by supporting two blade bodies 1 and 2 with a center shaft 3 and cutting a tree branch or the like by opening and closing operations of the grips 4 and 5 at the base of the center shaft 3. In the scissors, the handle is rotated in the opening / closing direction of the blade body on the handle bottom portion of one gripping handle 4 and rotated in the longitudinal extension direction of the gripping handle 4 and toward the other gripping handle 5. In order to selectively hold the two positions of the rotated lock position, the spring is biased by a spring, and a locking piece 6 having a locking hole 9 is pivotally attached.
An inclined guide surface 5a is formed at the handle bottom portion of the other grip handle 5 so as to face the grip handle 4 on which the locking piece 6 is pivotally attached, and the guide surface 5a is formed in the longitudinal direction of the handle handle 5a. A protruding hooking claw 8 is provided.
Then, when the blade is closed by the turning operation of the gripping handles 4 and 5 while the locking piece 6 pivotally attached to one gripping handle 4 is rotated to the lock position, the locking piece 6 It rotated along the guide surface 5a formed on Eshiri portion, locking holes 9 formed in the hanging claws 8 and the engaging piece 6 formed on the guide surface to so that to engage.
[0005]
The locking piece 6 pivotally attached to the handle bottom portion of the grip handle 4 is a plate having a width narrower than the side width of the handle handle, and projects from the side width of the handle bottom to one side of the lock piece. It is preferable to form the finger hook portion 15 in advance.
As a specific structure, a groove 11 is formed on the inner surface of the gripping handle 4 , and the locking piece is axially attached in a state where the base end portion of the locking piece is fitted in the groove 11 . Further , a leaf spring 12 is disposed in the groove 11 and brought into contact with the distal end portion of the leaf spring 12 so as to press against the proximal end portion of the locking piece 6. Then, at the base end portion of the locking piece 6 with which the leaf spring 12 abuts, the lock release position abutment surface 13 held at the position rotated in the extending direction of the grip handle 4 and the direction of the grip handle facing each other. A lock position contact surface 14 is formed to be held at the moved position .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the pruning shears locking mechanism according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view of the entire pruning basket with the blade body closed, and FIG. 2 is a front view of the entire pruning basket with the blade body opened.
[0007]
The pruning shears shown in FIGS. 1 and 2 support a blade body 1 as a receiving blade and a blade body 2 as a cutting blade so as to be rotatable by a center shaft 3. And used to cut a tree branch or the like by opening and closing the gripping handle 5. The blade body 1 and the grip handle 4 and the blade body 2 and the grip handle 5 may be integrated, but the grip handle and the blade body are formed separately and fixed integrally. The pair of grips 4 and 5 are provided with springs 10 that are always urged in the opening direction, and are released as shown in FIG. The pruning work can be performed by the operation of.
[0008]
A locking piece 6 that rotates in the opening / closing direction (opening / closing plane) of the blade body is attached to the shaft 7 at the handle bottom portion of the grip handle 4 of the blade body 1 that is a receiving blade. On the other hand, a hook claw 8 that protrudes downward in the longitudinal direction of the gripping handle 5 in the drawing is formed on the handle bottom of the gripping handle 5 of the blade body 2 that is a cutting blade. The locking piece 6 can be rotated in the direction of the gripping handle 5 as indicated by a two-dot chain line from a position rotated downward indicated by a solid line in FIG. Then, by forming the locking hole 9 in the locking piece 6, the hooking claw 8 is engaged with the locking hole 9 and is locked by the force of the spring 10 biased in the direction of opening the blade body. Is maintained.
[0009]
In order to pivotally attach the locking piece 6 to the gripping handle 4, as understood from FIGS. 3 and 6, a groove 11 is formed on the inner surface of the gripping handle 4, and the base of the locking piece 6 is formed in the groove 11. The shaft 7 is fixed with the end portion fitted. At this time, a spring, for example, a leaf spring 12 is disposed in the groove 11, and the distal end portion of the leaf spring 12 is brought into contact with the base end portion of the locking piece 6. The base end portion of the locking piece 6 with which the leaf spring 12 abuts is unlocked so that the distal end portion of the leaf spring 12 is in surface contact when rotated in the extending direction of the grip handle, that is, downward as shown in FIG. As shown in FIG. 4, the position contact surface 13 and a lock position contact surface 14 with which the tip of the leaf spring 12 comes into surface contact when rotated in the direction of the gripping handle 5 are formed. The stop position of the locking piece 6 due to the action of the lock position abutment surface 14 and the leaf spring 12 is a position that is slightly rotated inwardly from the position where the locking piece 6 is engaged with the hooking pawl 8 and stopped. It should be noted that the spring to be brought into contact with the locking piece 6 may be a spring other than the leaf spring as long as it retains a predetermined position by elasticity.
[0010]
With the above configuration, the locking piece 6 is rotated in the longitudinal extension direction of the gripping handle 4 shown in FIG. 3, that is, the unlocking position, and the locking piece 6 is rotated toward the gripping handle 5. It is naturally held at the moved position, that is, the locked position. The locking hole 9 formed in the locking piece 6 is formed at a position where it engages with the hooking claw 8 at the locked position. Although the locking hole 9 is illustrated as a through hole in the drawing, it may be a blind hole with a certain depth.
[0011]
The handle bottom inner surface of the grip handle 5 that faces the grip handle 4 to which the locking piece 6 is attached is a large round guide surface 5a, and the surface of the hooking claw 8 that faces the grip handle 4 faces forward. The guide surface 8b is inclined in a direction away from the stop piece, and is formed as a rounded surface in the drawing. Further, the tip of the locking piece 6 is rounded to make it easy to slide. As a result, as shown in FIG. 5 (a), the grips 4 and 5 are closed as indicated by the arrows while being rotated in the direction of the grip 5 facing the locking piece. When the handle is strongly squeezed, the tip of the locking piece first comes into contact with the guide surface 5a of the grip handle 5 and the guide surface 8b of the hanging claw 8, and the spring of the leaf spring 12 as shown by the arrow in FIG. It turns downward on the drawing little by little against the force. Finally, the positions of the hooking claws 8 and the locking holes 9 of the locking pieces 6 coincide with each other, and the locked state shown in FIG. 4 is obtained. In this locked state, the latching piece 6 is pressed in the direction of the gripping handle 5 by the elastic force of the leaf spring 12, and the gripping handles 4 and 5 are urged in the opening direction by the spring 10. Thereby, the latching state of the latching piece 6 and the hanging claw 8 is maintained, and a locked state is not cancelled | released carelessly.
[0012]
The locking piece 6 is formed in a plate shape having a width W slightly narrower than the width W ′ of the handle bottom portion of the gripping handle 5, and a finger hook portion 15 is protruded on one side. Thereby, in a state where the grip handle in the locked state is gripped, the locked state is released by hooking the finger-hanging portion 15 on an arbitrary part, for example, a part of the worker's own clothes and turning the locking piece, Pruning work can be performed. The finger-hanging portion 15 may be protruded on either the left or right side surface or both side surfaces of the locking piece 6, but is preferably protruded on one side surface. The direction in which the finger-hanging portion 15 is projected may be formed on the side surface facing the operator when the grip handle is gripped. In this way, it is easy to perform the attaching / detaching operation of the locking piece on the surface of the worker's clothes and the like, and the locked state is not released by inadvertently hitting a peripheral object. This means that the finger-hanging portion 15 protrudes to the opposite side for right-handed use and left-handed use. In addition to protruding sideways, the finger-hanging portion extends in the longitudinal direction of the locking piece 6 as indicated by 15 'in FIG. Easy to use.
[0013]
Thus, the locking mechanism of the present invention is a combination of the locking hole 9 of the rotating locking piece and the hooking claw 8 protruding from the surface of the handle bottom, and the engagement / disengagement direction protrudes in the longitudinal direction of the grip handle 5. Since it is the direction to press the plate-shaped locking piece with the locking hole against the hanging claw, the locking piece can be rotated by the action of hooking the finger hooking part 15 on a part of clothes etc. It can be canceled. Therefore, it is not always necessary to perform unlocking using both hands as in the conventional pruning shears, and the pruning operation can proceed smoothly.
In the pruning shears embodying the present invention, the handle bottoms of the grip patterns 4, 5 are not sharp, but have a certain pattern bottom surface, which is an inclined surface including the guide surface 5a in the illustrated embodiment. .
[0014]
【The invention's effect】
According to the lock mechanism of the pruning shears of the present invention according to claim 1, the hook formed on the handle bottom part of the other grip handle is rotated by the locking piece pivotally attached to the handle bottom part of the one handle handle. It is engaged with the nail. The locking rod can be selectively held in the locked position and unlocked position by the elasticity of the spring, and it can be easily applied to the hook by simply holding the grip handle while holding it in the locked position. A locking piece can be engaged and it can be set as a locked state. Therefore, the pruning operation can be efficiently performed.
[0015]
According to the second aspect of the present invention, the locking piece is pressed against an arbitrary portion, and the locking piece is rotated with the pressed position as a support, so that the operation for changing the lock position and the unlocking position can be easily performed. Can do.
[0016]
According to the invention described in claim 3, the invention described in claim 1 can be realized with a simple structure. In any position of the locked state and the unlocked state, the state of the locking piece is maintained by the force of the leaf spring, and it is possible to avoid being locked inadvertently or being unlocked. it can.
[Brief description of the drawings]
FIG. 1 is a front view of the entire pruning bar with the blade closed;
FIG. 2 is a front view of the entire pruning ridge with the blade body open;
FIG. 3 is a longitudinal sectional view of only the handle bottom portion of the grip handle in the unlocked state with the blade body closed;
FIG. 4 is a longitudinal sectional view of only the handle bottom portion of the grip handle in a locked state with the blade body closed;
FIG. 5 is a longitudinal cross-sectional view of the handle bottom portion showing the process of changing from the unlocked state to the locked state;
FIG. 6 is a bottom view showing a handle bottom portion in a locked state;
FIG. 7 is a side view of a handle bottom portion showing a locked state by a solid line and an unlocked state by a two-dot chain line;
FIG. 8 is a front view of only the handle bottom portion showing an example of a conventional pruning shears locking mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 2 ... Blade body 3 ... Center axis | shaft 4,5 ... Grip handle, 5a ... Guide surface, 6 ... Locking piece, 7 ... Shaft, 8 ... Hanging claw, 8a ... Locking surface, 8b ... Guide surface, DESCRIPTION OF SYMBOLS 9 ... Locking hole, 10 ... Spring, 11 ... Groove, 12 ... Leaf spring, 13 ... Lock release position contact surface, 14 ... Lock position contact surface, 15 ... Finger hook part.

Claims (3)

In pruning shears that support two blades on the center axis and cut tree branches etc. by opening and closing the grip handle at the base than the center axis,
A lock release position that is rotated in the opening / closing direction of the blade body in the handle bottom part of one grip handle and rotated in the longitudinal extension direction of the handle handle, and a lock position rotated in the direction of the other handle handle The locking piece that is biased by a spring and selectively formed with a locking hole to hold the two positions is pivotally attached,
The handle grip portion of the other gripping handle forms an inclined guide surface on the surface facing the gripping handle on which the locking piece is pivotally mounted, and a hooking claw protruding in the longitudinal direction of the gripping handle is provided on the guide surface. ,
When the blade is closed by rotating the gripping handle while the locking piece pivotally attached to one gripping handle is rotated to the locked position, the locking piece is formed on the handle bottom of the other gripping handle. A pruning shears locking mechanism that rotates along the guide surface and engages a hooking claw formed on the guide surface and a locking hole formed in the locking piece.   The locking piece that is pivotally attached to the handle bottom portion of the grip handle has a plate shape that is narrower than the side width of the handle handle, and projects from the side width of the handle bottom to one side of the plate-shaped locking piece. The pruning shears locking mechanism according to claim 1, wherein a finger hooking portion is formed. A groove is formed on the inner surface of the gripping handle, and the locking piece is pivotally attached with the base end portion of the locking piece fitted into the groove, and a leaf spring is disposed in the groove so that the distal end portion of the leaf spring is Abutting to the base end part of the locking piece, facing the lock release position abutting surface that holds the base end of the locking piece with which the leaf spring abuts in the position rotated in the extending direction of the grip handle The pruning shears locking mechanism according to claim 1 or 2, wherein a lock position abutting surface is formed to be held at a position rotated in the direction of the grip handle .

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