JPH0726472B2 - Plasterer - Google Patents

Description

Detailed Description of the Invention a. TECHNICAL FIELD The present invention relates to an improvement in plastering iron.

B. Conventional technology: A traditional metal plaster iron of this kind has a back metal made of elastic metal.
By gradually reducing the thickness of the spine as it goes forward and backward from the pedestal and expanding the width to make it easier to bend, this spine is adhered to the mortarboard, and the pedestal is caulked to the spine. (Japanese Utility Model Publication No. 59-32680; hereinafter referred to as a first example), or a bar-shaped back metal having projections arranged in a row on its lower surface and a tapered pressing metal plate are heat-welded, and the back surface of the pressing metal plate is Apply adhesive,
Some of them were attached to the mortarboard body (Japanese Utility Model Publication No. 61-28843, hereinafter referred to as the second example).

In addition, a spring plate whose both ends are pressed down by the thickness of the back metal is placed on the back metal, and the back metal, the spring plate, and the column base are welded together to form an upper structure. There was also one in which the structure was adhered to a trowel plate (hereinafter referred to as a third example).

C. Problems to be solved by the invention. : The plaster trowel of the first example described above is made of elastic metal (usually 2.5 to
The work of cutting both ends of a back metal made of 3.0 mm heat-treated steel plate) into a required curved surface while cooling it without tempering requires special skill and skill.

Further, in order to fix the column base in a standing manner, it is a labor-intensive and cautious task to drill a square hole for caulking in a back metal made of a heat-treated steel plate.

In the process of cutting or punching the heat-treated steel plate, a strain is often generated during the work, or a strain is left after the process.

The plastering trowel of the second example shows that when the rear end of the trowel is lifted and the wall surface is strongly pressed by the tip of the trowel, the pressing sheet metal has a constant thickness.
Since the rod-shaped back metal has high rigidity, the trowel plate does not flex (flex) at the tip of the pressing sheet metal and the tip of the bar-shaped back metal.
This caused all sorts of "breaks in the waist" and impaired workability.

Since the plastering iron of the third example used the heat-treated spring steel plate as it was when manufacturing the spring plate,
The adjustment range of elasticity after molding was narrow, and it was inconvenient because springs of various strengths had to be prepared separately.

D. It is an object of the present invention to eliminate the drawbacks of the prior art and to inexpensively supply plastering irons that are easy to manufacture and convenient to use.

E. Structure of the Invention: The present invention will be described with reference to the drawings. (1) is an upper structure, (2) is a mortarboard, and (3) is a handle.

The upper structure (1) includes an inverted L-shaped column base (5) in which the insertion portion (4) to the handle (3) is configured as one body, a cover plate (6),
It comprises a back metal (7) made of a rigid metal, and the column base (5), the cover plate (6) and the back metal (7) are welded inseparably.

The cover plate (6) is made of a rectangular annealed carbon steel plate, and a recess (8) for accommodating the back metal (7) is provided on the lower surface of the cover plate (6). It is made equal to the thickness (t) of the back metal (7). That is, when the back metal (7) is inserted into the recess (8), the lower surface of the cover plate (6) and the lower surface of the back metal (7) are flush with each other.

In addition, (9) is the front protrusion of the cover plate (6), (10) is the front end of the recess, (11) is the top surface of the recess, (12) is the rear end of the recess, and (13) is
Is a rear protrusion.

When the width of the cover plate (6) is larger than the width of the back metal (7) plus twice the thickness (t) of the back metal (7), the recess (8) is pressed. , Cover plates (6)
The flange (14) remains on the side of.

Next, as shown in FIGS. 4 and 5, the cover plate (6) having the same width as the back metal (7) is used.
Is bent at a right angle to its longitudinal direction, and the front protrusion (9), the front portion (15), the upper surface (16), the rear portion (17), the rear protrusion (1
3), the distance between the front part (15) and the rear part (17) is made equal to the length of the back metal (7), and the front and rear protrusions (9) (13)
The height difference between the upper surface (16) and the upper surface (16) is made equal to the thickness (t) of the back metal (7).

1 and 2 and 3, the cover plate (6) has a front end (10) and a front protrusion (9) of the recess, and a rear end (12) and a rear protrusion (12) of the recess ( Since 13) and 13) are heat-treated respectively, the parts have elasticity.

Similarly, the front stage (15) and the front protrusion (9) and the rear stage (17) and the rear protrusion (1) shown in FIGS.
Since 3) and 3) are each heat-treated, elasticity is also imparted to this part.

Make sure that the back metal (7) and the cover plate (6) are not separated.
The main points are spot welded (18).

(19) is an adhesive that is elastically deformable even after bonding. The adhesive (19) may be in the form of paste or double-sided adhesive tape.

The "heat treatment" referred to here is a series of processes in which an annealed carbon steel sheet is first "quenched" and then "annealed" to give the carbon steel sheet elasticity of the required strength. Refers to the heat treatment process. Further, in the blade industry including the plastering iron manufacturing industry, the above-mentioned "series of heat treatment steps" is simply called "quenching".

F. Action: Since the plastering iron of the present invention is constructed as shown in the drawings and described above, it acts as follows.

Unlike the conventional method, it is not necessary to carefully cut the thick back metal made of elastic steel plate while cooling, so the material will be distorted during work and it will not be usable, or internal distortion will remain in the finished product. There is nothing to do.

Further, the front part and the rear part of the cover plate (6) are heat-treated to give elasticity to the parts, and the upper structure (1) and the trowel plate (2) can be elastically deformed even after being bonded. Since it is adhered with a special adhesive (19), when pressing the wall surface with the trowel plate during plastering, lift the rear end of the trowel plate (2) and apply force to the trowel plate (2). Bends to press the wall, but the front protrusion (9) of the cover plate (6) is sufficiently adhered to the trowel plate (2), and the front protrusion (9) and the front end of the recess (10) are Since it is elasticized by heat treatment, the front protrusion (9) bends according to the bending of the trowel plate (2) and transmits the pressing force applied to the handle (3) to the trowel plate (2).

At this time, since the curvature of the trowel plate (2) and the curvature of the front protrusion (9) are different, the tip of the front protrusion (9) is slightly displaced forward, but due to elastic deformation of the adhesive (19), the trowel The plate (2) and the front protrusion (9) are not separated.

The flange (14) of the cover plate (6) in FIGS. 1 and 2 may be omitted in order to adjust the appearance.

The adhesive (19) may be in the form of a paste or a double-sided adhesive tape.

G. Example: The figure shows one example of the present invention.

In the trowel used for finishing work, the trowel plate: 223 × 73 × 0.5 stainless steel plate, the back metal: 130 × 25 × 1.6 carbon steel plate, the cover plate: 185 × 25 × 0.7, the carbon steel plate partially heat-treated. Length: 45 (Unit: mm) Adhesive: Two-liquid modified silicone manufactured by ThreeBond Co., Ltd. Miyazaki No. 1 (trade name) is baked at 150 ° C. for 15 minutes Assembly of upper structure: The plaster iron of the present invention that is electrically welded is , When the rear end of the mortar plate (2) is raised and the wall is pressed by the tip of the mortar plate (2), the mortar plate (2) and the cover plate (6) do not bend at the waist and respond to changes in the applied pressure. The trowel that had a good bending property (so-called “bending condition”) and good workability was obtained.

Nitto Denko double-sided adhesive tape as the adhesive (19)
Even when No. 541 (trade name) was used at room temperature, a trowel with good bending and good workability was obtained as in the case of using the above-mentioned two-liquid modified silicone.

In addition, since the elasticity of the front protruding portion (9) of the cover plate (6) can be adjusted by adjusting the partial heat treatment of the cover plate (6), using the cover plate (6) of the same standard, The degree of bending of the mortarboard (2) could be adjusted.

J. EFFECTS OF THE INVENTION Since the plastering iron of the present invention is configured and operates as described above, it has the following effects.

・ First, form the cover plate (6) with an annealed carbon steel plate,
Next, since heat treatment is applied to necessary portions at both ends of the cover plate (6) to give elasticity to the cover plate (6), it is not necessary to perform a troublesome process such as cutting the spring steel while cooling the spring steel. There is no distortion due to the heat inside and no defective products are produced, and manufacturing is easy, and therefore products can be supplied at low cost.

-When the cover plate (6) is partially heat-treated, the elasticity of that part of the cover plate (6) can be adjusted by changing the strength of quenching and annealing. Accordingly, it is not necessary to prepare a large number of spring plates (corresponding to the cover plate) in which the types and dimensions are finely changed.

Therefore, the number of types of the cover plate (6) can be reduced, so that the manufacturing cost can be reduced.

-Also, by changing the thickness of the cover plate (6), the elasticity of the cover plate (6) can be changed, so that the degree of freedom in selecting a material is large.

[Brief description of drawings]

FIG. 1 is a perspective view of a plastering iron of the present invention, FIG. 2 is an explanatory view of a cover plate and a back metal, (a) is a plan view, (b) is a sectional view, and FIG. 3 is an assembly drawing. FIG. 4 is a perspective view of another embodiment, and FIG. 5 is an explanatory view of a cover plate and a back metal.
Is a plan view, and (b) is a cross-sectional view. In the figure, (1) …… upper structure (2) …… trowel plate (5) …… column base (6) …… cover plate (7) …… back metal (8) …… recess (t) …… Thickness of back metal (9) …… Front protrusion (10) …… Recess front end (12) …… Recess rear end (13) …… Rear protrusion (15) …… Front stage (17) …… Rear stage (18) …… Welding (19) …… Adhesive.

Claims (2)

[Claims] 1. In a plaster trowel, a recess (8) for accommodating a rigid metal back metal (7) is provided on the lower surface of a rectangular cover plate (6) made of annealed carbon steel plate, and the recess (8) is provided. The depth of 8) is made equal to the thickness (t) of the back metal (7), and the front protrusion (9) of the cover plate (6) is longer than the rear protrusion (13) of the cover plate (6). Structure, the front end of the recess (10) and the front protrusion (9), and the rear end of the recess (1
2) and the rear protruding part (13) are respectively heat-treated to give elasticity to the part, and the back plate (7) is installed in the concave part (8) of the cover plate (6) to cover the cover plate (6). ) The column base (5) is erected on the upper surface (11) of the recess (8) and the column base (5), the cover plate (6) and the back metal (7) are inseparably welded to each other. A plasterer, characterized in that the body (1) is bonded to the mortar plate (2) with an adhesive (19) that is elastically deformable even after bonding. 2. A back metal (7) having a width equal to that of the back metal (7).
A cover plate (6) made of an annealed carbon steel plate having a length longer than that of the above is bent at a right angle to the length direction, and a front protrusion (9), a front stage (15), an upper surface (16) , Rear part (17),
Without the rear protrusion (13), the distance between the front stage (15) and the rear stage (17) is made equal to the length of the back metal (7), and the front and rear protrusions (9) (13) and the upper face (16)
The height difference between and is equal to the thickness (t) of the back metal (7), and the front stage (15) and the front protrusion (9), and the rear stage (17) and the rear protrusion (13), Each of them is subjected to heat treatment to impart elasticity thereto, and a back metal (7) is inserted between the front part (15) and the rear part (17) of the cover plate (6) to cover the upper surface of the cover plate (6). The column base (5) is erected on the (16), and the column base (5), the cover plate (6) and the back metal (7) are inseparably welded together to form the upper structure (1). Plaster trowel according to claim 1.