JPH0440445Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a pair of scissors in which two blade plates are biased in the opening direction by a spring, and is particularly suitable for use in gardening. This invention concerns a locking device that keeps the plate closed.

[Conventional technology]

In scissors, especially gardening shears, it is common practice to use a spring to bias the blade plate in the direction of opening in order to make it easier to use. It must be locked to prevent this.

As shown in FIG. 17, in a conventional scissors locking device, a locking member B is pivotally attached to one blade A of a pair of blade plates that slide and rotate relative to each other, and the locking member B is attached to the other blade A. The locking member B can be attached to and detached from a part of the plate D, or the locking member B can be pivoted to one of the handles E and F that interlock with the blade plates A and D, as shown in Fig. 18, and the locking member B can be attached to and detached from the other handle. As shown in FIG. 19, a ring-shaped or hook-shaped locking member G is provided at the base end of the handle F so that the handle F can be engaged with and detached from the other handle E.

[The problem that the idea aims to solve]

The above-mentioned conventional scissor locking device requires a hand that is different from the one that holds the scissors, or even if it is the same hand, to engage and release the locking device with an operation that is different from the gripping operation, resulting in poor workability. It had the drawback of being bad.

The object of the present invention is to devise a locking device that can automatically release the lock simply by firmly grasping the scissors in the closed state, and to obtain scissors that are easy to use and have excellent workability.

[Means to solve the problem]

The object is a pair of scissors in which two blade plates 3, 4 are pivoted together by a center screw 5, and the blade plates 3, 4 are biased in the opening direction by a spring 7, and one blade plate 4 or its handle is used. A weak spring 24 is attached to the part, which is movable toward and away from the other blade plate 3 or its handle part.
A locking member 22 is provided which is biased in the direction of being pulled back by.

Further, the other blade plate not provided with the locking member or its handle part is provided with a notch 33 through which the tip of the locking member 22 can freely move forward and backward when the blade plate is in the most closed state. A part of the locking member within 33 is pressed against the side surface of the notch by the elastic force of the spring 7 which biases the blade plates 3 and 4 in the direction of opening.

That is, the spring 2 for pulling back the locking member
The spring 4 is weaker than the spring 7 for urging the blade plate in the opening direction. The locking state of the lock member in the notch can be realized by the frictional resistance generated by the pressing force between the lock member and the side surface of the notch due to the elastic force of the spring 7. Of course, a recess 34 may be provided in a part of the side surface of the notch, into which a part of the locking member is fitted. Even in this case, the tip of the locking member can move forward and backward when the blade plate is in its most closed state.

The scissors consist entirely of a blade unit 1 in which two blade plates are pivotally attached with a center screw, and a handle unit 2 in which two handle members are pivotally attached. Attach the
There is one in which one end of the connecting rod 20 is connected to the blade plate 4 and the other end is connected to a part of the lower handle 11. In such a device, a lock member 22 is provided at the center of rotation to which the two handle members are pivoted.

[Effect]

When the blade plate is in the most closed state, that is, when the handle is strongly gripped against the elastic force of the spring 7 (the handle position indicated by the two-dot chain line in FIG. 1), the tip of the locking member 22 is in the notch 33. It can move forward and backward freely [see Figure 4]. When the tip of the locking member 22 is pushed forward into the notch 33 and the grip on the handle is released, the resilient force of the spring 7 causes the blade plate to spread slightly. [The handle position shown by the solid line in FIG. is pressed against the side surface inside the notch 33 and locked, resulting in a locked state (see FIG. 5).

To release the lock and use the scissors, grip the handle firmly. When the handle is gripped and the lower handle 11 reaches the handle position shown in FIG. The blade plates 3 and 4 can be opened and closed by moving freely. [See FIG. 6] FIG. 1 shows an embodiment applied to scissors consisting of a blade unit and a handle unit, but the above-mentioned effect is the same in the embodiment shown in FIG. 16.

Note that when a recess 34 into which a part of the lock member fits is provided on the side surface of the notch, the recess 34 is designed to increase the frictional force with the lock member or to support the force that pulls the lock member back. act.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the locking device for scissors of the present invention will be described with reference to the accompanying drawings.

Figures 1 to 15 show the locking device of the scissors of the present invention, which consists of a blade unit 1 and a handle unit 2. The blade unit 1 is rotatably attached to the tip of the handle unit 2, and The opening/closing direction of the blade plate can be changed from flat to perpendicular to the gripping direction of the handle, and this example shows an application to scissors mainly used for mowing lawns. This can be understood from Figures 1 to 3.

The blade unit 1 includes a lower blade plate 3 and an upper blade plate 4.
A cylindrical member 6 is fixed to the base end of the blade plate 3 for attachment to the handle unit 2. Further, a spring seat 8 for attaching a coiled spring 7 is fixed to the upper blade plate 4. The lower end of the center screw 5 passing through the blade plate 3 and the blade plate 4 is fixed to the lower blade plate 3, and the center screw 5
The upper and lower ends of the spring 7 are engaged with the adjustment screw 9 screwed onto the upper end and the spring seat 8 fixed to the blade plate 4, respectively, and the torsional force of the spring 7 causes the blade plate 3 and the blade plate 4 in the direction of releasing it.

On the other hand, the handle unit 2 is composed of an upper handle 10 and a lower handle 11, both handle members are pivotally attached with a handle screw 12, and the cylindrical member 6 of the blade plate unit 1 is attached to the front end surface of the upper handle 10. A circular seat 13 for mounting is formed, and a through hole 14 is formed through which a part of the cylindrical member 6 passes, so that the blade plate unit 1 and handle unit 2 can be mounted rotatably. . In the drawing, reference numeral 15 denotes a volume nut for preventing the blade plate unit from slipping off, which is attached to the tip of the cylindrical member of the blade plate unit that has passed through the through hole 14 of the upper handle, and 16 and 17 are used to prevent the blade plate unit from rotating inadvertently. They are coil springs and steel balls.

One end of a connecting rod 20 is connected to the lower end of the lower handle 11 using a metal fitting 18 and a stud 19. The lower handle 11 and the blade plate 4 are connected to a connecting hole 21 provided so that the lower handle 11 and the blade plate 4 are interlocked.

The handle unit 2 is provided with a locking device on the center of rotation of the upper handle 10 and the lower handle 11 to maintain the handles in a closed state. This locking device includes a locking member 22 that swings back and forth,
A cap-shaped cap 23 that accommodates the lock member 22
and a weak spring 24 that biases the lock member 22 in the direction of pulling it back.

That is, as shown in FIGS. 11 to 14, the cap 23 provided with the window hole 25 has a guide groove 2.
A locking member 22 that slides left and right in the drawing along 6
The locking member 22 can be moved in and out by a predetermined length is biased in the direction of drawing it into the cap 23. Legs 27, 27 for attachment are provided protruding from the back surface of the cap 23.

As can be understood from FIGS. 3, 7, and 8, a boss 28 made of synthetic resin is molded on the lower handle body made of metal at the pivoting part of the lower handle 11.
On its surface are legs 27, 2 protruding from the cap 23.
By providing mounting holes 29, 29 into which the locking device 7 is inserted, the locking device can be mounted on the lower handle 11.

In the drawing, 30 is a through hole for connecting the connecting rod 20, and 31 is a shaft hole into which the handle screw 12 is inserted.

Upper handle 10 to which the lower handle 11 is pivoted
As shown in FIGS. 9 and 10, the metal upper handle body is integrally molded with a synthetic resin material to give it an easy-to-grip shape. The locking device attached to the lower handle, that is, the notch 33 is located in front of the shaft hole 32 at a position that corresponds to the position where the tip of the locking member 22 appears and retracts when the handle is strongly gripped and the blade plate is closed. will be established. This notch 33 is assumed to be a blind hole in the drawing, so that the locking member 22 can be inserted smoothly and a gap as small as possible can be maintained between the upper and lower side surfaces of the locking member and the opposing side surface.

As shown in FIG. 4, when the upper and lower handle members are gripped most strongly and the lower handle 11 is in the handle position, the lock member 22 can freely move in and out of the notch 33. Therefore,
When the lock member 22 is pushed forward through the window hole 25 of the cap 23 with a finger and the grip force on the handle is weakened, the entire lock member 22 rotates a little as shown in FIG. The locking member is locked by coming into contact with the side surface, and the lower handle is maintained in the locked state at the handle position.

When using scissors, firmly grasp the upper and lower handles, which are in the locked position shown in Figure 5. Then, the contact between the lock member 22 and the side surface of the notch is released, and the lock member 22 is instantly pulled back by the action of the spring 24, and the lower handle 11 is moved to the handle position shown in FIG. 4 and the position shown in FIG. The handle can be rotated freely between the positions.

In order to maintain the lock state shown in Figure 5,
Lock member 2 generated by the rotational force of spring 7
The frictional resistance between the lock member 2 and the side surface of the notch must be greater than the force generated by the spring 24 that directly operates the locking member, but since this rotational force is inversely proportional to the distance from the center of rotation, the above-mentioned When the locking member 22 is provided on the rotating shaft as in the embodiment, the locked state can be maintained more reliably. Note that by reducing the gap between the lock member 22 and the side surface of the notch as much as possible, the play between the handle positions of the lower handle 11 will be minimized.

FIG. 16 shows another embodiment of the present invention, in which the handles 10' and 11' have blade plates 3' and 11', respectively.
The double-edged plates 3' and 4' are pivoted by a center screw 5' and biased in the direction of opening by a spring 7'. In this embodiment, a lock member 22 having the same structure as the previous embodiment is used.
is attached to the front end of the handle 11', and the tip of the locking member 22 is attached to the notch 3 formed in the blade plate 3'.
3' so that he can appear freely. and,
A recess 34 is formed in the notch 33', and
The distal end of the locking member 22 is shaped like a beak so that it fits into the recess 34. Although the recess 34 differs depending on its shape, it has the function of increasing the resistance between the lock member 22 and the side surface of the notch, or the function of supporting the force generated by the spring 24 to pull back the lock member 22. be.

Furthermore, the lock device according to the present invention is provided at least within the reach of the fingers, mainly the thumb, while gripping the handle, so that engagement of the lock is extremely effective in that it pushes the lock member forward and weakens the grip on the handle. This can be done with simple movements.

[Effect of idea]

According to the locking device of the scissors of the present invention, the lock can be released by simply grasping the handle, making the scissors extremely easy to use. This not only simplifies the locking/unclosing operation in normal use, but also allows you to lock/unlock when you cannot use both hands freely or while performing other tasks with one hand. It is convenient in some cases.

In addition, when the locking device according to the present invention is installed at the center of rotation of the handle, the force to maintain the locked state generated by the spring biasing the blade plate in the direction of opening should be applied as large as possible. I can do it. Further, in the case where a recess is formed within the notch, the holding force of the locking member within the notch can be increased. These have the effect of preventing the locked state from being released accidentally and allowing a spring with as large an elasticity as possible to be attached to the lock member in order to ensure reliable operation when releasing the lock.

[Brief explanation of drawings]

Figures 1 to 16 of the accompanying drawings show an embodiment of the locking device of the scissors of the present invention, in which Figure 1 is an overall front view, Figure 2 is an overall plan view, and Figure 3 is an exploded perspective view. , FIGS. 4 to 6 are schematic diagrams, partially cut away, showing the operation of the handle and the lock member,
Fig. 4 shows the handle in its most closed state, Fig. 5 shows the locked state, Fig. 6 shows the unlocked scissors in use, Fig. 7 is a front view of only the lower handle,
Figure 8 is a sectional view taken along the - line in Figure 7, Figure 9 is a front view of only the upper handle, and Figure 10 is a cross-sectional view taken along the line X-X in Figure 9.
Line sectional view, Figure 11 is a front view of only the locking device,
FIG. 12 is a rear view of only the lock device, FIG. 13 is a rear view of only the lock device with the lock member moved, and FIG. 14 is a cross-sectional view of only the lock device.
Figure 15 is a longitudinal sectional view of the shaft attachment part of the blade plate unit.
FIG. 16 is a front view of the entire scissors of the modified embodiment, and FIG.
1 to 19 are front views showing an example of a conventional locking device. 1...Blade plate unit, 2...Handle unit, 3, 4...Blade plate, 5...Center screw, 7...
... Spring, 10 ... Upper handle, 11 ... Lower handle, 12 ... Handle screw, 20 ... Connection rod, 2
2...Lock member, 23...Cap, 24...
Spring, 25... Window hole, 26... Guide groove, 33...
...notch, 34... recess.

Claims (1)

[Claims for Utility Model Registration] 1. In scissors in which two blade plates 3 and 4 are pivotally attached by a center screw 5 and the blade plates 3 and 4 are urged in the opening direction by a spring 7, one A lock member 22 is provided on the blade plate 4 or the handle thereof, and is movable toward the other blade plate 3 or the handle thereof, and is biased in the direction of being pulled back by a weak spring 24. The blade plate 3 or its handle portion is provided with a notch 33 through which the tip of the locking member can freely move forward and backward when the blade plate is in the most closed state.
3, a part of the locking member is pressed against the side surface of the notch by the elastic force of the spring 7 which biases the blade plates 3 and 4 in the direction of opening, and is locked therein. A locking device for scissors. 2. The entire scissors consists of a blade unit 1 in which two blade plates 3 and 4 are pivoted together by a center screw 5, and a handle unit 2 in which two handle members, an upper handle 10 and a lower handle 11, are pivoted. configure,
The base end of the blade plate unit 1 is rotatably attached to the tip of the handle unit 2, and one end of the connecting rod 20 passing through the center of rotation of the blade plate unit is attached to the blade plate 4.
The utility model according to claim 1, characterized in that the other end is connected to a part of the lower handle 30, and a lock member 22 is provided at the rotation center portion to which the two handle members are pivoted. Scissors locking device. 3 The locking means for locking the locking member 22 in the notch 33 is by the elastic force of the spring 7.
A locking device for scissors according to claim 1 or 2, which is achieved by frictional resistance generated by the pressing force between the locking device and the side surface of the notch. 4. The locking device for scissors according to claim 1 or 2, which is provided with a recess 34 into which a part of the locking member 22 fits into the side surface of the notch 33.