JPH0341640Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a position fixing device for a blade-sliding cutter knife.

In general, this type of cutter knife moves a blade fixed to a slider forward and backward together with the slider inside a groove-shaped blade holder with a lip, so that the tip of the blade can come out and go out, and is usually clicked onto the inner edge of the lip of the blade holder. By providing a row of V-shaped notches for the blade and separating it from the leaf spring built into the slider, the blade can be positioned in both the protruding and retracting positions.
In many cases, even though the overall length of the blade is shortened due to the renewal of the cutting edge of the blade by breaking it off, many of the blades are designed to be arbitrarily clicked.

In general, release of the blade position holding constraint with a click stopper is done not only by operating the slide, but also in heavy processing, such as cutting plywood, where there is a large cutting reaction force acting on the blade with the tip protruding. Since this occurs easily, screw locks are often used rather than click locks in this type of application, but they are extremely difficult in terms of operability.

(Prior art) Regarding locking with a click, Japanese Utility Model Publication No. 1988-8844 discloses that a locking member having a flexible arm is provided on a sliding body, and locking and releasing can be selected using a locking operation plate. Although such a cam type cutter knife has been disclosed, in this case, there is still an inconvenience in that it takes time and effort to move the lock operation plate before or after the operation of the slide operation plate.

(Problem that the invention attempts to solve) By only a single operation of moving the sliding knob forward and backward,
It is an object of the present invention to provide a position fixing device for a blade-sliding cutter knife, which has a simple structure that can first unlock the slider, and then reliably achieve relocking or preparation for relocking or relocking the slider after realizing the following movement of the slider. This is the purpose of this idea.

(Means for Solving the Problems) This invention consists of a blade holder in the shape of a groove with a lip, and a slider that can move back and forth along the groove with the blade fixed at the tip inside the groove of the blade holder. A U-shaped row of notches is provided on the inner edge of the lip of the blade holder, and the slider includes a latch that selectively engages the U-shaped row of notches by moving transversely to the advancing and retracting direction. a spring biasing the latch; and a flexible rod receiving a retracting force against the spring to release the latch, the flexible rod having an annular member at its end. a sliding knob having a protrusion that engages the annular member of the lever;
This is a position fixing tool for a blade sliding cutter knife that is attached to the slider.

Now, Fig. 1 shows the external appearance of the main parts of the click-stop slide cutter knife of this invention, in which 1 is a grip which can be made of a plastic molded body, 2 is a blade holder usually made of sheet metal molding, and 3 is a sliding cutter knife. The knob and 4 are the sliders.

The blade holder 2 generally extends in the shape of a groove with a lip, and only at its tip forms a holding part (not shown) that holds the blade between the blades.
A U-shaped notch row 2a is provided on one side of the inner edge of the lip. Note that 2b in the figure is a row of V-shaped notches provided on the other side of the inner edge of the lip when using the click-fastening method.

The slider 4 fitted inside the groove of the blade holder 2 so as to be able to move forward and backward along the groove has a protrusion 4a at its tip that locks the tail end of the blade, and a step seat 4b on which the tail end is placed, as shown in FIG. It has a rising part 4d which is sandwiched between the lips of the blade holder 2 at the latter half of the base part 4c which has been cut down as shown in FIG. A leaf spring 5 protruding from the blade holder 2 may be built in, and the leaf spring 5 may be engaged with and disengaged from the V-shaped notch row 2a of the blade holder 2, thereby controlling the click-stopping of the slider 4.

Grooves 4f are provided on both sides of the rising portion 4d,
A sliding knob 3 having a guide 3a capable of engaging with this dovetail groove 4f is made slidable over a distance between stoppers 4g and 4h provided at the front and rear of the upper surface of the rising portion 4d.

The sliding knob 3 has a roof-shaped top surface with a medium height for forward and backward movement, and also has a pin-shaped downward protrusion 3b on the lower surface that hangs down toward the lip on the opposite side of the U-shaped notch row 2a.

On the other hand, the upper surface of the slider 4 is provided with a horizontal groove 4i and its constricted portions 4j, 4k as shown in FIG. U-shaped cut row 2
with a spring 7 acting in a direction that can selectively engage b.
Place it in the horizontal groove 4i.

The latch 6 is provided with a spring receiver 8, which is preferably made of plastic such as polypropylene or nylon, which is fixed integrally with the latch 6, and a flexible rod 8a extending from the spring receiver 8 in the form of a string is connected to a ring-shaped member. 8b is integrally formed, and the downward protrusion 3b of the sliding knob 3 is inserted into and fitted into this annular member 8b.

(Operation) When the sliding knob 3 is moved forward as shown in Fig. 2b,
The downward protrusion 3b is connected to the annular member 8b as shown in FIG. 3b.
By bending the flexible rod 8a through the spring 7
While pulling out the latch 6, which is integrated with the spring receiver 8, from the U-shaped notch row 2b, the sliding knob 3 comes into contact with the stopper 4g of the slider 4, so the slider 4 is moved forward along with the slider 4, and thus the blade When the operating force applied to the sliding knob 3 is loosened at the position where the cutting tip protrudes, the latch 6 realizes selective engagement or preparation with the U-shaped notch row 2a by the restoring force of the spring 7. A clear and therefore reliable locking by the latch 6 against the reaction forces acting on the cutting edge is achieved. This operation is almost the same when the sliding knob 3 is moved backward.

(Effect of the invention) Each time the sliding knob is simply moved forward or backward, the lock by the latch on the slider and hence the blade is first released, and then the forward and backward movement of the slider occurs in a follow-up manner, allowing the blade tip to be properly extended or retracted. When the sliding knob becomes free in this extended or retracted position, a reliable relocking of the slider and thus of the blade is easily achieved, thus reducing the reaction force or resistance applied to the blade during the cutting operation by the blade. Therefore, a reliable locking of the blade against undesired retraction is achieved with simple operation.

[Brief explanation of drawings]

FIG. 1 is a plan view of the main parts, FIG. 2 is a side view of the slider, and FIG. 3 is a plan view of the slider. 2...Blade holder, 2a...U-shaped notch row,
2b...V-shaped notch row, 3...Sliding knob, 3b...
Projection, 4...Slider, 5...Leaf spring, 6...
...Latch, 7...Spring, 8a...Flexible rod,
8b...Annular member.

Claims (1)

[Claims for Utility Model Registration] A blade holder 2 in the shape of a groove with a lip,
This blade holder 2 consists of a blade that is fixed at its tip inside the groove and a slider 4 that can move forward and backward along the groove.A U-shaped notch row 2a is provided on the inner edge of the lip of the blade holder 2, and the slider 4 is configured to move forward and backward. a latch 6 selectively engaging the U-shaped row of notches 2a by transverse movement; a spring 7 biasing the latch 6 in the direction of engagement; and a spring 7 biasing the latch 6 against the spring. and a flexible rod 8a which receives a pullback force in the direction of releasing the lock, and this flexible rod 8a has an annular member 8 at its end.
b and engages with this annular member 8b.
A position fixing tool for a blade sliding type cutter knife, which is made by mounting a sliding knob 3 having a diameter of 1.b on the slider 4.