spatula

Abstract

Spatula, characterized in that it comprises a blade (1), a left clamping plate (5), a right clamping plate (2), a locking mechanism and a handle body, wherein the left clamping plate (5) and the right clamping plate (2) are arranged opposite each other on both sides of the locking mechanism.

Description

TECHNICAL AREA The present utility model relates to the technical field of construction and renovation tools, in particular a spatula, more precisely a two-tone spatula whose blade is quickly replaceable, which is stable in the hand and can be used with minimal effort. STATE OF THE ART Putty knives are common tools used in construction and renovation for applying and smoothing mortar and filler. Conventional putty knives consist mainly of a handle and a blade. The blade is usually attached to the handle in one of three ways: (1) the blade is permanently attached to the handle and cannot be replaced; when the blade becomes worn or damaged, the entire tool must be discarded, resulting in significant material waste and high operating costs; (2) the blade is attached to the handle or blade holder with several screws; replacing the blade requires tools such as a screwdriver, which is cumbersome and inefficient; with long-term use, the screws can loosen due to vibration, causing the blade to wobble and affecting the smoothness of the plaster;(3) Simple insertion: Patent CN218990795U discloses a spatula with a plug-in connection in which the blade is inserted into the handle via locking elements and grooves; although this design allows for tool-free assembly and disassembly, the fit between the locking element and the groove relies on the radial deformation of elastic clamping pieces, and after repeated insertion and removal, plastic deformation or wear easily occurs, leading to a loose connection. Furthermore, this design only allows for the assembly and disassembly of the handle without taking into account the stability of clamping the blade and the prevention of wobbling, so it cannot meet the requirements for highly precise positioning of the blade during plastering. In summary, existing putty knives exhibit significant shortcomings in three aspects: quick blade changes, long-term clamping stability, and structural durability. This makes it difficult to guarantee both ease of use and working accuracy. There is an urgent need for a putty knife that allows for tool-free, quick blade changes while ensuring a secure locking mechanism and long-lasting, unloosened use. CONTENTS OF THE PRESENT USE SAMPLE The present utility model aims to overcome the shortcomings of the prior art and to provide a spatula that offers quick blade changes, stable clamping, a long service life and easy handling in order to solve problems such as the fact that the blade, as a consumable part, cannot be quickly and individually replaced, that the plug-in blade loosens and wobbles during long-term use, and that the operation of the locking mechanism is cumbersome and requires tools. The present utility model is realized as follows: a spatula comprising a blade, a left clamping plate, a right clamping plate, a locking mechanism and a handle body, wherein the left clamping plate and the right clamping plate are arranged opposite each other on both sides of the locking mechanism. Furthermore, the locking mechanism comprises a mounting plate, a mounting sleeve, a locking pressure element and a clamping element, wherein the locking pressure element has a C-shaped cross-section. Furthermore, the handle body also includes a rod connector, a counterpart, a handle rod and a handle sleeve. Furthermore, a positioning notch is provided at the rear end of the clamping element. Furthermore, the locking mechanism includes a locking switch located at the end section of the left terminal plate, which has a non-slip pattern or soft coating on its surface. Furthermore, two fastening elements are arranged at the rear end of the clamping element, located at the positioning notch, to attach the clamping element to the locking pressure element. Furthermore, a limiting projection is provided above the clamping element, which is connected to the rod connector. Furthermore, screws are provided on the left clamping plate and / or the right clamping plate. Furthermore, the blade is made of spring steel and has a thickness of 0.3 to 1.0 mm. Furthermore, one or more locking teeth are arranged at the end of the blade, with locking openings provided at the corresponding locations on the mounting plate. Compared to the prior art, the present utility model has the following advantages: 1. Tool-free, quick blade replacement is enabled; through the interaction of the left and right clamping plates with the locking mechanism, the present utility model allows for quick replacement of the blade as an independent wear part, while the main design elements such as clamping plates and mounting plate are reusable in the long term. This significantly reduces the generation of plastic waste and corresponds to the trend towards environmentally friendly tools; 2.The blade's wobble is reduced; the lateral limitation formed by the left and right clamping plates, as well as the clamping of the blade's rear end by the mounting plate, creates a stable clamping construction with three-point support, which reduces the blade's back-and-forth sliding and radial oscillation. This solves the technical problem of conventional plug-in spatulas loosening and wobbling after prolonged use, and ensures the plaster's evenness. BRIEF DESCRIPTION OF THE DRAWING Fig. 1 shows an exploded view of an embodiment of the present utility model; Fig. 2 shows an assembly diagram of an embodiment of the present utility model; Fig. 3 shows a side view of an embodiment of the present utility model in the assembled state; Fig. 4 shows a top view of an embodiment of the present utility model in the assembled state; Fig. 5 shows an exploded view of a working part of the spatula provided by an embodiment of the present utility model. Reference symbol list 1 Blade 2 Right clamping plate 3 Mounting plate 4 Mounting sleeve 5 Left clamping plate 6 Locking switch 7 Screw 8 Nut 9 Hex screw 10 Handle bar 11 Rotary knob 12 Handle sleeve 13 Locking pressure element 14 Rod connector 15 Counterpart 16 Clamping element 17 Fastening element 18 Insert 19 Positioning notch 20 Limiting projection DETAILED DESCRIPTION In conjunction with the accompanying drawings and embodiments, the present utility model is explained in more detail below to clarify its objective, technical solutions, and advantages. It is understood that the detailed embodiments described here serve only to illustrate the present utility model, rather than to limit its scope. The present invention relates to a spatula that differs from conventional spatulas in which the blade is either permanently attached to the main body or simply pushed on. The spatula described in this application uses a combination of a split clamping structure and a locking mechanism to enable tool-free quick blade changes as well as highly rigid and stable clamping. The spatula comprises: a blade as the working element, a left and a right clamping plate as a holding and support structure, a locking mechanism to control the clamping state, and a handle body that is held by the operator. In particular, the left and right clamping plates are the central supporting components for the blade clamping function; they are arranged at a distance from each other, with the clamping space serving to accommodate the rear end sections of the blade on both sides. The internal geometry of the left and right clamping plates is adapted to the edge contour of the blade; under the influence of the locking mechanism and the locking switch, both can move closer together or further apart, thereby applying and releasing the clamping force. The locking mechanism is the central motion conversion element of the entire technical solution. The locking mechanism converts the operator's movements, such as pushing and turning, into the clamping movement of the left and right clamping plates. The handle body serves as the power transmission interface between the operator and the tool; it is firmly connected to the left and / or right clamping plate and its shape adheres to ergonomic principles, thus providing a comfortable, non-slip, and energy-saving grip. The handle body can be designed as a single-piece construction or as an assembly made up of several parts. See Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5, the present application provides a spatula comprising a blade 1, a left clamping plate 5, a right clamping plate 2, a locking mechanism and a handle body. In one embodiment, the blade 1 can be made of carbon spring steel, for example, 65Mn spring steel strip formed by stamping and having a thickness of 0.5 mm. The front end of the blade 1 forms the working edge, the rear end and both sides form the clamping area. In particular, both the left clamping plate 5 and the right clamping plate 2 are made of ABS plastic using injection molding and are arranged spatially opposite each other on the left and right. In another embodiment, the inner clamping surfaces of the left clamping plate 5 and the right clamping plate 2 (i.e., the surfaces in direct contact with the blade 1) are provided with a net-like, non-slip pattern. This net-like, non-slip pattern consists of intersecting, fine grooves and can be produced directly during injection molding. When the left clamping plate 5 and the right clamping plate 2 clamp the blade 1, the net-like, non-slip pattern significantly increases the coefficient of friction, thus further improving the slip resistance of the blade 1, which is particularly suitable for construction sites with high loads and strong vibrations. As shown in Fig. 2 and Fig. 4, an insert 18 is provided on the right underside of the right clamping plate 2. This insert 18 is inserted from the right underside of the right clamping plate 2 into the interior of the mounting plate 3 and seals it to prevent the ingress of mud and dust during construction and to avoid impairing the normal function of the internal structure of the mounting plate; at the same time, it conceals the machining marks at the end of the mounting plate, so that the rear end has an approximately arc-shaped contour to prevent injury to the operator. The left clamping plate 5 and the right clamping plate 2 each have screw holes through which the screws 7 are inserted. The screws 7 fasten the left clamping plate 5 and the right clamping plate 2 to both sides of the locking pressure element 13; the screws 7 can be made of brass or ABS. In particular, the locking mechanism comprises the mounting plate 3, the mounting sleeve 4, the locking switch 6, the locking pressure element 13 and the fastening and clamping element 16. As shown in Figures 1 and 5, the mounting plate 3 and the mounting sleeve 4 are located between the left clamping plate 5 and the right clamping plate 2 and serve to press the blade 1 against them and fix it relative to the blade. The mounting plate 3 is a plate-shaped main component manufactured from PVC plastic using an injection molding process. The mounting sleeve 4 consists of a soft, elastic material that is applied to the gripping and contact surfaces of the mounting plate 3 using a two-component injection molding process and provides reinforcement. Once the mounting plate 3 and the mounting sleeve 4 are connected to the rear end of the blade 1, the left clamping plate 5 and the right clamping plate 2 clamp this assembly securely.Preferably, one or more locking teeth are arranged at the end of the blade, with locking openings provided at the corresponding locations on the mounting plate 3 to prevent forward and backward movement of the blade. The locking pressure element 13 forms the main body of the locking mechanism; the cross-section of the locking pressure element 13 has a substantially C-shaped structure, with the lower part serving to secure the blade 1 and the upper part to firmly connect the handle body. The locking switch 6 is arranged at the end of the left clamping plate 5 to facilitate operation by the user. The clamping element 16 engages above the locking pressure element s13, its groove engaging in the opposite direction with the projections of the locking pressure element 13. A limiting projection 20 is provided on the clamping element 16 for connection to the handle body. A threaded surface is located on the left side of the limiting projection 20, and a corresponding locking thread is provided at the lower right end of the rod connector 14, forming an adjustment and detent mechanism for setting the blade angle. Two positioning notches 19 are provided at the rear end of the clamping element 16, on which fastening elements 17 are arranged. The fastening elements 17 serve to secure the clamping element 16 to the locking pressure element 13, ensuring the mounting strength of the locking mechanism. See Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5, the handle body further comprises a rod connecting piece 14, a counterpart 15, a handle rod 10 and a handle sleeve 12. Specifically, the rod connector 14 and the clamping element 16 are screwed together by a hexagonal screw 9 and a nut 8, which pass through the limiting projection 20. The nut 8 is fixedly connected to the rotary knob 11, and the connection is tightened or loosened by turning the rotary knob 11. At the upper end of the rod connector 14 is a hollow sleeve into which the counterpart 15 is inserted. The handle 10 is a round carbon steel rod that is placed onto the upper end of the counterpart 15, with the counterpart 15 being inserted into and connected to the hollow sleeve at the upper end of the rod connector 14. The grip sleeve 12 is attached to an end of the handle 10 opposite the working end and is made of ABS material to improve slip resistance. The rotary knob 11 is attached to a side of the limiting projection 20 and serves to adjust the connection with the rod connector, thereby adjusting the angle of the handle 10 relative to the spatula. The locking switch 6, the rotary knob 11, and the locking pressure element 13 can be made of plastic or metal, with the outer surface of the locking switch 6 preferably having a non-slip pattern to facilitate manual operation. The assembly and working procedure of the spatula are as follows: For assembly, the mounting plate 3, the mounting sleeve 4 and the blade 1 are positioned accordingly, fixed with the left clamping plate 5 and the right clamping plate 2 on the left and right and the screws are tightened, thus completing the assembly. During operation, the operator firmly holds the handle sleeve 12 and applies force via the handle 10. This force is transmitted via the rod connector 14 and the clamping element 16 to the mounting plate 3 and the blade 1. The leading edge of the blade 1 contacts the wall, floor, or mortar to be smoothed, enabling tasks such as screeding and leveling. Depending on the work location, the operator can loosen the rotary knob 11 to adjust the angle of the handle 10 relative to the work area. After adjustment, the rotary knob 11 is tightened again to achieve a more comfortable working angle in various body positions. Unless otherwise specified, the plastic parts in the various embodiments of this utility model, such as the left clamping plate 5, the right clamping plate 2, the locking switch 6, the rotary knob 11, the handle sleeve 12, the locking pressure element 13, the rod connector 14, the counterpart 15, and the clamping element 16, are made of ABS engineering plastic and are manufactured by injection molding. The mounting plate 3 and the mounting sleeve 4 are made of soft PVC plastic and are manufactured by two-component injection molding or coating molding. Nut 8 is a brass or ABS nut manufactured using the insert molding process. Hex bolts 9, screws 7, and other metal parts are made of carbon steel or A3 steel and are zinc-plated or blackened for rust protection. The blade 1 consists of 65Mn spring steel strip and is manufactured by stamping, heat treatment, surface coating, and other processes. The thickness is preferably 0.3 mm to 1.0 mm, and the hardness is maintained in the range of HRC 45-52 to ensure both wear resistance and toughness. The selection of the above-mentioned materials and processes can be made taking into account cost, strength and operating environment and is not limited to a specific material. The foregoing description merely presents preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model. All modifications, equivalent replacements, or improvements made within the framework of the principles of the present utility model fall within the scope of protection of the present utility model. QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature CN 218990795U

[0002]

Claims

Spatula, characterized in that it comprises a blade (1), a left clamping plate (5), a right clamping plate (2), a locking mechanism and a handle body, wherein the left clamping plate (5) and the right clamping plate (2) are arranged opposite each other on both sides of the locking mechanism. Spatula according to claim 1, characterized in that the locking mechanism comprises a mounting plate (3), a mounting sleeve (4), a locking pressure element (13) and a clamping element (16), wherein the locking pressure element (13) has a C-shaped cross-section. Spatula according to claim 1, characterized in that the handle body comprises a rod connecting piece (14), a counterpart (15), a handle rod (10) and a handle sleeve (12). Spatula according to claim 2, characterized in that a positioning notch (19) is provided at the rear end of the clamping element. Spatula according to claim 2, characterized in that the locking mechanism further comprises a locking switch (6) located at the end section of the left clamping plate (5) and provided on its surface with a non-slip pattern or a soft coating. Spatula according to claim 4, characterized in that two fastening elements (17) are further arranged at the rear end of the clamping element (16), which are located on the positioning notch (19) to fasten the clamping element (16) to the locking pressure element (13). Spatula according to claim 2, characterized in that a limiting projection (20) is further provided above the clamping element (16), which is connected to the rod connecting piece (14). Spatula according to claim 1, characterized in that screws (7) are provided on the left clamping plate (5) and / or the right clamping plate (2). Spatula according to claim 1, characterized in that the blade (1) is made of spring steel and has a thickness of 0.3 to 1.0 mm. Spatula according to one of claims 1 to 9, characterized in that one or more locking teeth are arranged at the end of the blade (1), with locking openings being provided at the corresponding locations of the mounting plate (3).

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