JPS6014439Y2 - Operation lever pivot structure for opening/closing work tools - Google Patents

Description

[Detailed description of the invention] This invention is similar to those found in hand-operated instruments and tools such as scissors, pliers, and pliers, in which the tip-acting piece for cutting and other operations opens and closes around a fixed axis. In a movable opening/closing work tool, the opening/closing operation lever of the tip working piece is pivotally connected to the pivot of the piece by a separate and simple structure.

For example, conventional scissors used for various purposes,
The tip acting piece that becomes the cutting blade body and the opening/closing operation lever are made continuous and rigid, and the pair of such X-shaped front pieces are rotatably connected by a common pivot in the middle of the intersection. The structure is as follows.

In order to constantly bias the end working piece in the direction of mutual expansion so that it can be opened and closed easily, both ends of the helical spring wound around the pivot are attached to the opening/closing operation lever. Usually, the levers are locked together, or the operating levers are connected to each other by a bamboo spring interposed near the end.

However, this requires a helical spring or a bamboo spring in addition to the pivot, which is extremely troublesome to assemble, and it is also difficult to quickly respond to changes in the rotational angle of the expansion described above. Even more so, when the tip acting piece and its opening/closing lever are made separate and independent from each other and the former is attempted to slide relative to the latter, the sliding movement is impossible due to obstacles from the aforementioned pivots and springs. There are various problems such as

The present invention aims to improve these problems, and its specific configuration will be explained based on the illustrated embodiment. The figure illustrates the present invention applied to scissors, and in Figs. , 1 is a pair of mutually identical tip-acting pieces forming the cutting blade body of the scissors, which are cut from metal materials and cut the target object by the cutting edge machined on the front part thereof.

Reference numeral 2 denotes a pivot shaft that rotatably connects both pieces 1, and extends horizontally through the X-shaped intersecting midway portion of the pivot shaft.

The rear end of the piece 1 is extended rearward from the middle part of the intersection for a relatively short distance, and is defined as an engaging pawl 3 continuously bent at a substantially right angle.

The connecting shaft 2 of the piece 1 is secured from the screw fastening body between the bolt 4 and the nut 5, so that assembly and separation can be performed freely.

Numerals 6 and 7 are knobs made of synthetic resin molded and integrated into the bolt 4 and nut 5, respectively, and the outer surfaces of the knobs have convex portions 8 and 9 and concave grooves that can be rotated with a fingertip or a coin. , other locking means are provided.

By turning the knobs 6.degree. 7 and relatively tightening the bolt 4 and nut 5, it is also possible to clamp and fix both pieces 1 with the tip surfaces of the knobs 6 and 7.

Reference numeral 10 denotes an opening/closing operation lever for the piece 1, which is made of a pair of synthetic resin members having substantially the same U-shaped cross section and facing each other upside down.

Reference numeral 1 denotes a spring metal strip plate to which both levers 10 are pivotally connected at their front ends so as to freely rotate in an undulating manner, and a lead-out window 12 of the piece 1 is opened in the center thereof.

The opening width is substantially the same as the overlapping width of both pieces 1, and the rotation angle range in which the pieces 1 are expanded can be defined as desired by the length of the opening 12.

Both levers 10 are kept in a state where they are constantly expanded and elastically biased in opposite directions by this strip plate 11. For this purpose, after the strip plate 11 is punched including its lead-out window 12, It is formed into an arcuate shape with a spring tension of .

Reference numeral 13 denotes grooves for holding metal strips arranged on the outer surface of the top wall or the outer surface of the bottom wall of the front end of each lever 10, which position and restrain the left and right edges of the strip 11 of a constant width. There is.

Reference numeral 14 designates a hole for receiving a strip plate, which is also drilled in the front end of the lever 10 so as to be continuous with the holding groove 13.

The cut-off end of the band plate 11 is inserted into the burial hole 14 through the groove 13, and is coupled and fixed to the lever 10 by a fixture 15 that passes through and prevents removal.

In that case, the illustrated example shows a pin made of synthetic resin as the fixing device 15, and by extending the pin head in an umbrella shape, it is possible to display the origin of the product on the enlarged outer surface. , Of course not limited to this, screws and rivets,
Other fixing devices can be used, and substantially the same effect can be expected with adhesive.

Further, at the front end of the lever 10, a pair of opposing stopper protrusions 16 which substantially fit into the arcuate shape of the strip plate 11 are connected in an inwardly protruding manner.

On the other hand, at the rear end of the lever 10, a pair of abutting protrusions 17 that abut against each other when the lever 10 is closed are also protruded inward and continue, so that when the lever 10 is closed, both levers 10
A slide guide elongated hole 18 for sliding the pivot shaft 2 of the piece 1 in the front-rear direction is defined as a through-opening state between the two facing each other.

Reference numeral 19 denotes a concave stepped surface formed on the outer surface of the left and right side walls of both levers 10, which contacts the knob 6.degree. 7 of the pivot shaft 2 to facilitate its sliding.

As mentioned above, when the bolt 4 and nut 5 are relatively tightened, the knobs 6 and 7 are attached to the concave stepped surface 19 of the lever 10.
Can be crimped to

Incidentally, 20 is a concave and convex portion to prevent the grip operator from slipping with respect to the lever 10.

The fact that both levers 10 are formed to have a generally U-shaped cross section as a whole is useful for receiving the piece 1 into the groove thereof, and the engaging claw of the piece 1 is provided on the inner surface of the side wall of the U-shape. The piece receiver 21, which engages with the lever 3 and allows it to slide, is also arranged in a long and narrow row along the front and back direction of the lever 10.

The opening length of the groove rail 21 is substantially equal to the overall length of the piece 1, and the slide guide elongated hole 18 also corresponds to this, so when the pivot shaft 2 of the piece 1 is slid forward, the pivot shaft 2 is moved to the lever. 1 inward stopper protrusion 1
When the pivot 2 hits the abutting protrusion 17 of the lever 10, the lever 10 itself becomes a packaging case and the piece 1 is completely immersed inside it. , it can be stored in a small and compact size in its closed state, making it extremely convenient for safety and portability.

When the scissors configured as described above are used, as shown in Fig. 1.2, the scissors have a piece 1 and an operating lever 1.
0 is in charge of the pressing force of the spring metal strip 11, and is kept in a state where it expands together, so by grasping and squeezing the pair of levers 10, the piece The opening and closing action around the axis 2 in 1 allows the target object to be cut correctly.

At that time, it goes without saying that the piece 1 is exposed to the front from the center window 12 in the metal strip 11 for pivoting both levers 10, and there is also a risk that twisting operation force is applied to both levers 10. , the strip plate 11 is regulated and held in the holding groove 13 and the buried hole 14 of the lever 10, and furthermore, both levers 1
Based on the structure such as 0 being held from both the left and right sides,
This can be effectively suppressed and the opening/closing action of the piece can be stabilized.

When carrying or storing the piece 1, use the fingertips of the operator to grasp and squeeze both levers 10 to change the state from FIG. 2 to the state shown in FIG. Then, the piece 1 is held in its closed state through the engagement of its engaging claw 3 and the receiver of the lever 10 with the slotted rail 21, while the lever 10 is kept in its closed state. It becomes a case and slides into the inside of the case, completely storing it away.

Such a so-called folding action is performed against the elastic force of the spring metal strip 11 on the lever 10, and since the lever 10 and the piece 1 remain in the engaged state, it may be accidentally removed from the stored state. There is no risk that the piece 1 will slide forward or the lever 10 will expand, and it is extremely safe.

As described above, in the present invention, the pair of tip working pieces 1 are rotatably connected by the penetrating pivot 2 at the middle part of the X-shaped intersection, and the spring metal strip 11 at the front end allows the expansion to be performed at all times. A pair of piece opening/closing operation levers 10 that are connected and integrated so that they are elastically biased in the direction and can be raised and lowered.
The engaging pawls 3 bent from the rear end of the piece 1 are connected to the lever 10 so that the expansion elastic force of the strip plate 11 is directly borne by both pieces 1.
into the groove rails 21 arranged in rows along the longitudinal direction of the
It is assembled by freely engaging only the slides, and the front ends of both pieces 1 are designed to protrude and retract from the lead-out window 12 opened in the center of the strip plate 11 when the slides are operated. On the other hand, it is possible to slide the piece 1 freely in and out, and to open and close the piece 1 using the lever 10 at a single time. It can be made to act on

Moreover, in order to apply expansion force to the piece 1, the metal band plate 11 for connecting the front ends of both operating levers 10 in a manner that allows the front ends to be raised and lowered is a continuous opening in each operating lever 10. The strip plate 11 is inserted into the holding groove 13 and the burial hole 14 from the end thereof and is fixed with a fixing device 15 such as a pin or rivet, so that the strip plate 11 cannot be removed from the operating lever 10. Not only can the durability be maintained without the risk of damage, but also the danger of twisting operation force being applied to both levers 10 during use due to the fact that the operating lever 10 and the piece 1 are separate and independent from each other. Even though
The band plate 11 is positioned and restrained at both left and right edges in the holding groove 13, and is inserted and fixed into the burial hole 14, so that twisting operation can be effectively prevented and it is extremely stable. This has the effect of providing a good opening/closing action.

Further, the pivot shaft 2 passing through the intersecting midway portion of both pieces 1 is secured from the screw fastening body, and the knobs 6 and 7 thereof clamp both levers 10 from both left and right sides when the piece 1 and lever 10 are assembled. Being aware of this will also work organically in achieving the above effects.

In addition, since the lead-out window 12 is opened in the center of the metal band plate 11, both pieces 1 can be moved in and out and rotated without any trouble. The metal strip 11 can be easily and correctly bent into an arc shape, and the stress or bending stiffness concentrated in the center can be effectively dispersed, and therefore, the ease of opening and closing operations is also outstanding. become.

Even when assembling the lever 10 and the piece 1, which are separate from each other, it is possible to easily work without using special tools, and the piece 1 and the lever 10 are identical to each other and are arranged in a symmetrical manner in the above-mentioned assembly. Therefore, we can expect the maximum mass production effect.

[Brief explanation of the drawing]

The figure exemplifies the present invention applied to scissors.
Figures 3 and 4 are side views and plan views of the piece when it is not in use, Figure 5 is a side view showing the piece and its opening/closing lever disassembled, Figure 6 is A in Figure 4
- A sectional view taken along the line A, Fig. 7 is an enlarged front view of Fig. 3, Fig. 8 is an enlarged sectional view taken along line B-B of Fig. 3, and Fig. 9 is taken along line C-C of Fig. 5. It is an enlarged sectional view. 1... Tip action piece, 2... Pivot,
10...Opening/closing operation lever, 11...Spring metal strip plate 12...Zase lead-out window.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of tip acting pieces 1 rotatably connected by a penetrating shaft 2 extending from a screw fastening body at an X-shaped intersection midway, and a spring metal band at the front end. A pair of piece opening/closing operating levers 10 which are connected and integrated so as to be able to raise and lower are kept in an elastically biased state at all times in the expansion direction by the plate 11 and are made to be separate and independent from each other, so that the expansion elastic pressure of the metal band plate 11 is Engagement claws 3 bent from the rear end of the working piece 1 are arranged in groove rails 21 arranged in rows along the longitudinal direction of the operating lever 10 so that they are supported by the piece 1 for both cases. It is assembled by freely engaging only the slides, and when the slides are operated, the front end of the piece 1 for both cases comes out and goes out from the lead-out window 12 opened in the center of the metal band plate 11, and the metal Both ends of the band plate 11 are inserted into the holding groove 13 and the burial hole 14 which are continuously opened at the front end of the operating lever 10, and are fixed and integrated with the fixing device 15, while the screw fastening body is An operating lever pivot structure for an opening/closing work tool, characterized in that a pair of knobs 6 and 7 are formed projecting from a penetrating pivot shaft 2 so as to sandwich the operating levers 10 from both the left and right sides.