RU216064U1 - Construction knife - Google Patents

Abstract

The utility model relates to hand tools. SUBSTANCE: construction and mounting knife contains a body with a hollow handle and a blade position lock fixed on the handle. The knife is equipped with a lock on the handle to prevent the blade from falling out. In the body of the handle, a blade holder is made in the form of a metal guide 1.2 mm thick, in which the blade is installed. The blade is made of high-strength tool steel with a three-stage laser sharpening with a thickness of 0.7 mm. The technical result of the claimed utility model is to increase safety and accuracy when cutting. 5 z.p. f-ly, 2 pr., 3 ill.

Description

The utility model relates to hand tools, namely, construction and assembly knives with replaceable retractable segmented and trapezoidal blades, and is designed for cutting various building materials (linoleum, carpeting, wallpaper, gypsum boards, drywall, roofing materials, plastic, wood, mock-up works). Construction and assembly knives can be used both at home and by professionals.

A known knife contains a hollow handle with a bottom and a spring-loaded blade installed in it with the possibility of movement, having a base facing the cavity of the handle, as well as a blade position lock fixed on the handle, characterized in that, in order to expand functionality, the free end of the blade is made rectangular, and the blade itself is mounted in the handle with the possibility of installation movement to different lengths, while the handle is made of a cylindrical shape, on the inner surface of its cavity along the entire length, two guide grooves are made along a helical line, and on the base of the blade and side sections adjacent to base, protrusions are made for contact, respectively, with the spring and the mentioned helical grooves (RU 2040380 C1, B26B 1/08, 07/25/1995), taken as a prototype.

The main disadvantage of this knife is the lack of safety and accuracy of the cut.

The technical problem to be solved by the claimed utility model is the elimination of the above disadvantages and the creation of a construction and assembly knife that allows you to apply significant efforts when cutting without fear of slipping of the blade at the time of applying a lot of force to the knife, while maintaining accuracy, and also provides a confident grip and prevents the hand from slipping into the cut zone.

The technical result of the claimed utility model is to increase the safety and accuracy of cutting.

The technical result of the claimed utility model is achieved by a construction and assembly knife, containing a body with a hollow handle having a bottom, and a blade installed in it with the ability to move, having a base facing the handle cavity and a blade position lock fixed on the handle, according to the utility model it is equipped with a latch fixed on the handle to prevent the blade from falling out, and in the body of the handle there is a blade holder in the form of a metal guide 1.2 mm thick, in which a blade is installed, made of high-strength tool steel with a three-stage laser sharpening 0.7 mm thick.

Additionally, the body of the handle is made of aluminum alloy with rubber notches and stops or ABS plastic with rubber inserts and stops for a secure fit in the hand.

In addition, the blade fall-out lock is made in the form of a button or a lock screw, and the blade is made of SK4 or Y10A high-strength tool steel, while the guide is made of high-strength steel.

The construction and assembly knife is shown in the drawings, where

figure 1 shows a construction knife with a latch from falling out of the blade in the form of a button;

figure 2 shows a construction knife with a lock against falling out of the blade in the form of a locking screw;

figure 3 shows the procedure for replacing the cutting blade.

The construction and assembly knife contains a hollow handle (3) with a bottom and a blade (1) installed in it with the possibility of moving, and a blade position lock (5) and a lock against falling out of the blade (4) (figure 1).

The blade (1) has a base facing the cavity of the handle (3).

The blade position lock (5) is fixed on the handle, is automatic (Auto Lock) ensures secure blade fixation and uniform force transmission from the blade to the knife body (figure 1, 2).

The lock against falling out of the blade (4) can be made in the form of a button (figure 1), which reliably blocks the blade from falling out and by pressing which a safe blade change occurs.

In addition, the blade lock (4) can be made in the form of a locking screw (figure 2), which is a safe mechanism for fixing the blade and changing it. The screw lock can withstand loads up to 60 kg. To replace the cutting blade (figure 3), it is necessary to unscrew the locking screw, pull out and fold down the screw carriage. Then remove the blade position lock and the blade to be replaced. Then insert the blade, return the blade position lock to the knife body and return the screw carriage to its original position. Next, fix the locking screw to fix the blade and remove the backlash, which will make the cutting more accurate (Fig.3).

The body of the knife is made according to a two-component scheme and is a guide (2) made of high-strength steel, integrated into a lightweight, durable body made of aluminum alloy with rubber notches and stops or ABS plastic with rubber inserts and stops for a secure fit in the hand. At the same time, it should be noted that reliable fixation in the hand provides not only safety during cutting, but also improves the quality of cutting. The thickness of the steel guide (2) has been increased to 1.2 mm. This allows you to apply a force of up to 60 kg to the knife without the risk of deformation of the guide and the likelihood of injury to the user, and also improves cutting accuracy. The second feature of the guide is the reduced clearance of the guide-cutting blade pair. This leads to improved cutting accuracy by minimizing backlash and ensures safety when cutting.

These features impose a number of restrictions on the design of the guide, namely, the observance of bending radii for steel of increased thickness without violating its internal structure due to three-stage laser sharpening. To maintain the specified gap in the knife, a cutting blade with a thickness increased from 0.5 to 0.7 mm is used. A thicker blade also allows you to apply more force to the knife when cutting thick or hard materials without the risk of breaking the blade, leading to damage to the material being cut and the risk of injury.

Durable handle body with inserts and stops made of rubber, as well as notches and stops made of rubber, allows you to apply considerable effort when cutting. The rubberized body provides a strong and secure grip without fear of slipping the hand into the cutting area. Clamps of various designs securely fix the blade when working with great effort. A range of interchangeable blades made from high-strength tool steel grades (eg SK2, SK4, SK5) hold a sharp edge for a long time and retain the highest cutting ability of the tool. Thus, the claimed construction and assembly knife provides increased safety and cutting accuracy when using it.

Example 1

Construction knife HCM-50 EKF Expert (Fig.1) is designed for cutting various materials, in particular, paper, cardboard, plastic, etc. The knife is equipped with a metal guide thickened to 1.2 mm with a reduced gap between the blade for greater cutting accuracy , an ergonomic handle made of ABS plastic with rubber inserts and stops, a safe button for changing the blade and a thicker blade (0.7 mm) with a three-stage laser sharpening. The combination of these parameters allows you to speed up the cutting process, namely, to make it as accurate and safe as possible, namely, to increase the cutting accuracy by 5 times. This knife can withstand cutting force up to 25 kg.

Example 2

Construction knife 18 mm HCM-80 EKF Professional (figure 2) is designed for cutting various materials: paper, cardboard, plastic, linoleum, etc. and is equipped with a metal guide thickened to 1.2 mm with a reduced gap relative to the blade for greater accuracy cutting, an ergonomic handle made of aluminum alloy with rubber notches and stops, a safe mechanism for fixing the blade and changing it, and a thicker blade (0.7 mm) with a three-stage laser sharpening. The combination of these parameters allows you to speed up the cutting process, namely, to make it as accurate and safe as possible, namely, to increase the cutting accuracy by 5 times. This knife can withstand a cutting force of up to 60 kg and remains operational after a fall from a height of 10 m.

Claims (6)

1. A construction and assembly knife, containing a body with a hollow handle having a bottom, and a blade installed in it with the possibility of movement, having a base facing the cavity of the handle, and a blade position lock fixed on the handle, characterized in that it is equipped with a fixed on the handle the handle with a lock against falling out of the blade, and in the body of the handle there is a blade holder in the form of a metal guide 1.2 mm thick, in which a blade is installed, made of high-strength tool steel with a three-stage laser sharpening 0.7 mm thick. 2. Knife according to claim 1, characterized in that the body of the handle is made of aluminum alloy with rubber notches and stops or ABS plastic with rubber inserts and stops for secure fit in the hand. 3. Knife according to claim 1, characterized in that the latch against falling out of the blade is made in the form of a button. 4. Knife according to claim 1, characterized in that the lock against falling out of the blade is made in the form of a locking screw. 5. Knife according to claim 1, characterized in that the blade is made of high-strength tool steel grade SK4 or U10A. 6. Knife according to claim 1, characterized in that the guide is made of high strength steel.

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