Canvas stretcher

Abstract

To provide a canvas stretcher that uses a ratchet mechanism to tighten the canvas in stages without fail in the work of stretching and tightening the canvas to the board and releases painters, by turning its one-touch screw once, from burden of futile work caused by the fact that the canvas rotates only in one direction when the position at which the canvas edge is pulled and gripped is moved repeatedly and the repeating work is done.SOLUTION: The canvas stretcher is characterized in that it consists of: a main body bifurcated at a ratchet section into a lever section and a leg section; and two canvas gripping clips arranged at opposite positions for gripping the canvas so as to pull the canvas toward the main body via a tension belt on one side and via a tension relief section on the other side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This relates to an instrument used when stretching canvas cloth (hereinafter referred to as canvas) onto a canvas board. [Background technology]

[0002] Conventionally, when stretching a canvas on a canvas board having a wooden frame, the common method has been to grasp the edge of the canvas with pliers and pull it with a lever while fastening it to the frame with nails or staplers. A canvas stretcher using turnbuckles is also known (see Patent Document 1). Also, a canvas tensioner that utilizes a hand vice is known (see Patent Document 2). Ratchet mechanisms have been used in various forms in tightening devices such as packing straps. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jitszen No. 57-53400 Publication [Patent Document 2] Jitszen No. 63-112100 Publication Summary of the Invention [Problem to be solved by the invention]

[0004] The prior art shown in Patent Document 1 has a long, thin metal body (turnbuckle) with reciprocal reverse thread hooks on both ends of the length, and while turning the body, the clips holding both ends of the canvas are pulled toward the center to tighten the tension, and then turned in the opposite direction to loosen and remove the canvas. However, the canvas cannot be loosened or removed unless it is turned in the opposite direction the number of times required for pulling and tightening. In addition, there is a concern that the holding force of the clips on both ends is not very strong. In this series of operations, the turnbuckle must be kept above the board throughout the entire operation in order to rotate it by hand, and it continues to swing unstably in the air, and irregular, unstable, and uneven forces are constantly applied to both ends of the stretched canvas. From experience, it is difficult to complete the stretching process neatly and efficiently. In the prior art shown in Patent Document 2, the weight of the hand vice is extremely heavy, which is inconvenient for women in particular. In addition, even if the edge of the canvas is firmly grasped, the important thing in stretching a canvas is how to stabilize it horizontally and vertically without any shaking, and how to pull and tighten the canvas with the right amount of force to achieve the most suitable tension, but this crucial point is unclear and is left to the discretion of the user. Here, as in the above-mentioned Document 1, the entire process of operating the tool must be carried out in the air, and since the tool is much heavier than the turnbuckle, the irregularity, instability, and unevenness of the force applied to the canvas are all the more pronounced. This is a very worrying stress for those who want to start creating a painting quickly. This application provides a tool that can be used by anyone, male or female, and allows the artist to quickly determine the tension and stability that feels right to them, in as few steps as possible, and once the work of fixing the canvas has been completed, eliminates the tedious and laborious process of having to go back the way you came, and instead provides a tool that allows the artist to quickly tighten and release the clips that have been tightly gripping the canvas with a small twist, releasing the canvas and allowing the artist to remove the clips themselves. [Means for solving the problem]

[0005] This is a tool used to precisely position the canvas on the canvas board (hereinafter referred to as the board) vertically and horizontally. A main body equipped with a ratchet mechanism (hereinafter referred to as the ratchet part), A canvas that is folded from the front surface to the back surface through the wooden frame of the board, that is, the board frame. A canvas gripping clip that firmly grips the canvas to pull and tighten it from the opposing edge frames in the vertical and horizontal directions to the center side of the back surface of the board, It is composed of these two major elements, For the convenience of explanation, the shape of the main body is modeled after a step ladder. The part corresponding to the handle where the needle is set in the step ladder is called the lever part, and the part corresponding to the arm where the needle is pressed is called the leg part. The following explanation will be made accordingly. In the main body, the ratchet part is provided in the starting area that branches into two parts, namely the lever part and the leg part, In the lever part, It has a groove-shaped concave space on the back side when viewed from the leg part. The upper edge of the groove wall slides in a form that covers the concave space and is connected to a coil spring fixed to a part near the ratchet part of the groove. At the other end side of the groove, that is, at the end part of the lever part, a neutral lever is provided in a form that is detachably clip-fixed, In the leg part, It is wound around the rotation axis of the ratchet part. The end part of the tension belt that extends to the outside (opposite side of the leg part) is equipped with a canvas gripping clip. At the end part of the leg part that extends in the opposite direction, a spring-type tension relaxation part is provided, and the end part of the tension relaxation part is equipped with a canvas gripping clip, Both of these two canvas gripping clips are closed at one end (opposite side of the leg part), and the upper and lower two pieces are open at the other end (opposite side of the canvas). In the central part of the opening, an opening and closing spring that expands and contracts vertically is provided, and a wing nut is provided on the outside of the upper piece. It is possible to freely adjust the gripping strength of the opening part that holds the canvas, Unless a very special situation occurs, in the adjustment of the canvas tension degree, without a kind of wasteful effort such as neutralizing the ratchet function - relaxing the tension belt - turning the lever back, the operation can be restarted with just a slight twist of the wing nut, Thus, while the conventional ratchet mechanism and the associated neutralization mechanism are applied to the work procedures specific to canvas stretching, the desired tension can be quickly achieved while maintaining stability in the tensioning work, and the process of fixing a taut canvas to the frame can be completed in one go with almost no hassle, without the need to turn the lever back to its original position via the neutral lever operation, allowing you to focus on creating a painting in a comfortable atmosphere. This is a canvas stretcher having the above features. Effect of the Invention

[0006] (i) The tool can be removed from the hands and placed with its legs in contact with the board surface, like the legs of a seat on which a person sits. This relieves the user from the weight of the tool and the instability of operation when stretching a canvas, and allows the user to reliably and quickly achieve the desired tension. (b) With conventional devices, the degree of tension of the canvas that felt optimal when held in the hand was inevitably subject to slight errors once the canvas was removed from the hand. With this device, however, the canvas can be attached to the stretcher at the optimal tension. (c) Whether you need to redo an adjustment or have completed the desired stretching, you can enjoy the unique advantage of the ratchet mechanism, which irreversibly turns the ratchet wheel one jaw at a time in one direction only, without being bothered by the negative advantage that comes with it (you cannot go back one jaw at a time).With a single twist of the thumbscrew, you can start redoing the adjustment or remove the canvas in an instant. (ii) It can be used by anyone, regardless of the difference in muscle strength between men and women, or by people who get frustrated with fine adjustments or redoing work. (e) The structure is simple and clear, so regardless of dexterity or clumsiness, you can achieve the desired results in a short amount of time and move on to creating something. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of the appearance of the present invention; [Diagram 2] A side view of the canvas gripping clip that is part of the present invention. [Diagram 3]A cross-sectional view of the canvas gripping clip shown in Figure 2. [Figure 4] FIG. 1 is a perspective view of the appearance of the present invention in a used state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The following describes the embodiment and usage of the present invention. This is a tool used to neatly stretch and set a canvas on a canvas board for painting. It consists of a main body (1) equipped with a ratchet part (5); It is composed of two major elements: canvas holding clips (2), which firmly grasp the canvas (S), which is folded from the front to the back of the board (B) via the board frame (F), and canvas holding clips (2), which pull and taut the canvas (S) from the opposing board frames (F) vertically and horizontally to the center of the back of the board (B). The main body (1) is split into two parts, a lever part (3) and a leg part (4), starting from the ratchet part (5), and has a shape resembling a sideways V. In the lever portion (3), It has a groove-shaped recessed space on the back side when viewed from the leg portion (4), and is equipped with a neutral lever (10) that slides along the upper edge of the groove wall in a manner that covers the recessed space, is connected to a coil spring (11) fixed to a portion of the groove near the ratchet portion (5), and forms a detachable fixed portion (12) that is detachably clip-fixed at the other end side of the groove, i.e., the terminal portion of the lever portion (3). In the leg (4), A canvas gripping clip (2a) is provided at the end of the tension belt (6) which is rolled up around the rotating shaft of the ratchet section (5) and extends outward (opposite the leg section), and a spring-type tension relief section (7) is provided at the end of the leg section which extends in the opposite direction, and a canvas gripping clip (2b) is provided at the end of the tension relief section (7). Both of these canvas gripping clips (2) are closed at one end (the side facing the leg) and have two openings, one above and one below, at the other end (the side facing the canvas). In the center of the opening is an opening / closing spring (8) that expands and contracts vertically, and a wing screw (9) is provided on the outside of the upper piece, allowing the gripping strength of the opening that holds the canvas (S) to be freely adjusted. The present invention has the above-mentioned configuration, and its usage will be explained below. When using this, the canvas is placed under the board and the frame, folded back through the vertical (or horizontal) opposing board frames, the present invention is placed on the board surface in the middle of the opposing sides, the canvas holding clip (2a) and the canvas holding clip (2b) hold both ends of the canvas (S) at the point where they are almost parallel to the horizontal (or vertical) board frame (F), the thumbscrew (9) is quickly tightened to fix it, and the lever part (3) is rotated one step at a time with a ratchet to pull the canvas (S) from both ends toward the center and tighten it. Even if the canvas becomes a little too tight during this process, the excessive tension is automatically relaxed by the automatic spring adjustment of the tension relief part (7). When the appropriate tension is achieved, the canvas is fixed to the frame (F) in that state with nails or staplers. This operation is repeated several times, shifting the position of the edge of the canvas (S) that is gripped by the canvas gripping clip (2). Conventionally, the tool must be removed from the canvas (S) each time, and this has traditionally been a problem due to the negative advantage of the ratchet mechanism (irreversible rotation in only one direction). However, with the use of this invention, the tool can be removed and released from the canvas (S) with a single twist of the thumbscrew (9), allowing the work point to be moved to the next position immediately. In this way, once the canvas (S) has been secured to the vertical board frame (F), the same procedure can be used to quickly secure the canvas (S) to the horizontal board frame (F). Previously, this was the most tedious and tedious procedure that artists had to go through because there was no other way, but now, with just one quick touch, this is a blessing for artists who want to get down to creative work in a good mood; it cannot be described as simply "reducing preparation time." [Explanation of symbols]

[0009] 1 Main unit 2 Canvas Clips 2a Canvas clip 2b Canvas clip 3 Lever section 4 legs 5 Ratchet section 6 Tension Belt 7 Tension relief section 8 Opening and closing spring 9 Thumb screws 10 Neutral lever 11 Coil spring 12 Detachable fixing part B Board F Board Frame S canvas

Claims

1. A stretching tool used to stretch a canvas onto a canvas board, A main body having a lever part and a leg part each having a neutral lever, the lever part and the leg part being bifurcated from a ratchet part as a starting point; The whole body is placed on the board surface via the legs, which grip the canvas and pull it towards the body to tighten it. A canvas stretcher comprising:

2. In the legs, A canvas stretcher as described in claim 1, characterized in that at one end, it has a canvas gripping clip at the end of the tensioning belt that is rolled up around the rotating shaft of the ratchet section and extends outward (towards the canvas on the side opposite the leg section), and at the other end, it has a spring-type tension relief section and another identical canvas gripping clip at the end of the tension relief section.

3. On two canvas clips, Both are closed at one end (opposite the legs) and open at the top and bottom at the other end (opposite the canvas). A spring that expands and contracts vertically is installed in the center of the opening, and a thumbscrew is installed on the outside of the upper piece, allowing the strength with which the opening grips the canvas to be freely adjusted.

2. A canvas stretcher as claimed in claim 1, characterized in that:

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