Air scoop with improved structure

Abstract

An air blade with an improved structure, comprising an outer housing (1) and an inner housing (2), characterized in that the outer housing (1) is made of plastic, wherein the outer housing (1) comprises a handheld section (11) and a mounting section (12), wherein an air supply channel (14) is arranged within the handheld section (11), wherein the inner housing (2) is made of metal material, wherein the inner housing (2) is embedded in the mounting section (12) and injection-molded with the outer housing (1) to form an integrated structure, wherein a mounting cavity (25) is arranged within the inner housing (2), wherein a vent hole (15) is arranged obliquely rearward and upward at the upper end of the air supply channel (14), wherein the vent hole (15) is connected to the air supply channel (14) and the mounting cavity (25).wherein an associated deflection notch (26) is arranged obliquely over the passage of the vent hole (15) at the rear end section of the inner housing (2), wherein an air passage hole (27) communicating with the mounting cavity (25) is arranged at the rear end of the deflection notch (26), wherein the vent hole (15) extends through the deflection notch (26) and communicates with the mounting cavity (25) via an air passage hole (27), wherein the vent hole (15) extends through the rear end of the mounting section (12) to form an opening (151), wherein a locking element (152) is arranged at the opening (151), wherein the vent hole (15) is injection molded together with the outer housing (1) by means of a core pin during injection molding or is formed by drilling the outer housing (1) with a drill.

Description

TECHNICAL AREA

[0001] The present utility model relates to the technical field of pneumatic tools, in particular to an air scoop. STATE OF THE ART

[0002] The air shovel is a pneumatic tool with functions such as scooping, hammering, drilling, slotting, etc., allowing a single machine to perform multiple tasks. It is primarily used for sand cleaning castings and deburring large, medium, and small castings, thus correcting openings in stone, concrete, and brick walls. The air shovel is powered by compressed air, causing the piston inside its cylinder to move back and forth. This reciprocating motion of the blade is driven by the piston, resulting in a chiseling action on metal and building materials.For example, utility model number CN217475871U discloses an air scoop in which a vent hole is arranged for connecting the air supply duct and the cylinder, wherein the vent hole is generally formed by drilling with a drill after the manufacture of the housing is complete.

[0003] However, prior art air blades have the following problems: 1. Some air blade housings in the aforementioned patents are now made entirely of metal, resulting in a tall but excessively heavy and expensive finished product. 2. Some air blade housings are made entirely of plastic, making the finished product lightweight and relatively inexpensive, but its strength does not meet the application requirements. 3. There is also an air blade housing made of a combination of metal and plastic, which reduces the weight of the finished product and provides sufficient strength, but is difficult to manufacture and results in a high reject rate.Because the vent hole used to connect the air supply duct and the cylinder must pass through both the metal and plastic sections, the two different materials place different demands on the drill speed, power, and drill bit type when processing the drill tube. Considering the processing requirements of two different materials is difficult, making the process extremely challenging and resulting in a high product scrap rate. CONTENTS OF THE PRESENT USE SAMPLE

[0004] The purpose of the present utility model is to provide an air vane structure whose housing is made of metal material and plastic and is easy to process, in order to address the above-mentioned problems in the prior art.

[0005] The objective of this utility model is achieved by the following technical solution: An improved pneumatic blade, characterized in that it consists of an outer and an inner housing. The outer housing is made of plastic and includes a handle and a mounting part. The handle has an air inlet channel. The inner housing is made of metal and is embedded in the mounting part; it is injection-molded integrally with the outer housing. The inner housing has a mounting bore. At the upper end of the air inlet channel, a vent bore is inclined upwards and backwards, connecting the air inlet channel to the mounting bore. At the rear end of the inner housing, there is a corresponding recess through which the vent bore passes. At the rear end of the recess, there is another vent bore, which connects to the mounting bore.The vent hole penetrates the rear end of the assembly part, forming an opening in which a sealing element is provided. The vent opening is either injection-molded to the outer housing using a mandrel or created by drilling an opening into the outer housing.

[0006] The outer casing occupies a large portion of the air blade; the use of plastic effectively reduces the overall weight. The mounting hole, where the air blade performs its primary function, is made of metal. This ensures the stability of the mounting hole and the overall stability of the air blade. The use of these two materials for the casing provides stability while keeping the weight low, which facilitates handling and reduces manufacturing costs. Furthermore, the inner metal casing helps regulate the center of gravity, while the outer plastic casing provides a better grip, thus significantly improving user comfort.

[0007] Since the vent opening in the inner casing has a recess, it can either be manufactured directly during injection molding or machined during drilling so that the drill bit only needs to penetrate the plastic area without simultaneously drilling through the metal. This overcomes the technical limitations of existing technologies. A vent opening that connects the ventilation opening directly to the assembly space allows air circulation and thus enables the function of the air vane. The aforementioned technical features of this solution, achieved through optimization of the mechanism and its interaction, ensure the functionality of an air vane while simultaneously reducing weight, maintaining the same casing strength, simplifying processing, and increasing the product qualification rate.

[0008] The metal used to manufacture the inner casing can be, for example, aluminum, zinc alloy, or titanium alloy.

[0009] A protective cover encloses the opening and the sealing elements of the outer casing.

[0010] The protective cover makes the air vane blade more visually appealing.

[0011] The protective cover extends from the mounting area to the outside of the handle.

[0012] The protective cover improves grip and thus increases the ease of use of the air vane blade.

[0013] The assembly compartment contains, from front to back, a cylinder, a reversing valve, and a shock absorber. A piston moves up and down inside the cylinder. The rear of the shock absorber rests against the back wall of the assembly compartment, and the front against the reversing valve.

[0014] During operation of the pneumatic excavator, the piston moves back and forth within the cylinder. In doing so, it strikes the directional control valve, causing vibrations in the workpiece. The shock absorber absorbs the kinetic energy of the piston impact, thus reducing the vibrations and preventing damage to the workpiece.

[0015] Between the cylinder and the directional control valve is a seal with a through-hole for air exchange. The seal is made of metal.

[0016] It prevents the directional control valve from directly impacting the piston. By absorbing some of the impact force, it protects the directional control valve and prevents damage from piston impact. This makes the pneumatic excavator more durable. The use of metal for the seal further increases its durability.

[0017] The directional control valve contains a valve plate that is also made of metal.

[0018] Previously, the directional control valve plates were made of wood; replacing them with metal directional control valve plates results in a longer service life and higher load-bearing capacity.

[0019] There is a groove on the outer wall of the front cylinder part, into which a rubber sleeve is inserted.

[0020] When operating a pneumatic excavator, workers grip the cylinder at the front for stabilization. Because the cylinder is made of metal, its temperature drops in cold weather. During operation, the piston moves back and forth inside the cylinder, generating heat and raising the cylinder temperature. Both excessively high and low temperatures impair grip. Furthermore, the low friction of the metal cylinder makes it difficult to hold. The rubber sleeve provides better insulation and increased friction, thus improving grip and making the cylinder easier to hold.

[0021] The air intake duct is equipped with a sealing plug. Inside the air intake duct is an opening / closing pin with a contact surface that rests against the sealing plug. An elastic element within the air intake duct presses the opening / closing pin against the sealing plug. The tip of the opening / closing pin is located above the sealing plug. A trigger with a contact rod that extends into the air intake duct to apply pressure to the opening / closing pin is also present.

[0022] This technical solution places the opening and closing pin in the air inlet channel of the handle part of the outer casing, instead of locating it on the trigger at the upper front of the handle part (as shown in patent CN217475871U). This increases the airflow through the air vane blade. With current technologies, it is difficult to directly produce the vent openings in air vane blades with the opening and closing pin located in the air inlet channel of the handle part using injection molding or machining. Applying the technical invention of this patent to this air vane structure can achieve the purpose of this patent more effectively.

[0023] The handle is equipped with an air outlet channel, the air outlet of which is directed downwards. Above the air outlet opening is an air outlet baffle with an air outlet opening.

[0024] The downward-directed exhaust flow prevents the dust generated during operation of the air vane device from being stirred up, making the device more environmentally friendly; the design of the air outlet baffle and the air outlet opening prevents an excessively strong exhaust flow from stirring up dust.

[0025] Compared to the state of the art, the present air blade offers the following advantages: The air vane housing is divided into an inner and an outer casing. The inner casing is made of metal, while the outer casing is made of plastic. This gives the air vane housing a certain degree of strength while maintaining a lightweight overall structure and low manufacturing costs. The offset notch allows the drill bit to bypass the metal section of the housing during drilling. Only one material needs to be drilled, simplifying the manufacturing process and reducing costs. Using a core drill to create through-holes is easier than using a drill bit. BRIEF DESCRIPTION OF THE DRAWING Fig. 1 is a sectional view of an air scoop; Fig. Figure 2 is a schematic representation of the explosion structure of an air scoop; Fig. Figure 3 is a schematic representation of an inner housing; Fig. 4 is a partially enlarged representation of A of Fig. 1. Reference mark: 1 outer casing; 11 Handheld section; 12 Assembly section; 13 triggers; 131 Trigger rod; 14 Air supply duct; 141 sealing plugs; 142 Boundary area; 143 Opening and closing pin; 144 Elastic element; 15 vent holes, 151 Opening; 152 Locking element; 16 Protective sleeve; 17 Air discharge duct; 171 Air outlet opening; 172 Air exhaust flap; 173 Air exhaust bore; 2 inner housings; 21 shock-absorbing cushions; 22 cylinders; 221 pistons; 222 Exclusion; 223 Rubber sleeve; 23 Diverter valve; 231 Switching valve plate; 24 sealing washer; 241 sealing washer through hole; 25 Mounting cavity; 26. Evasive notch; 27 air passage holes. DETAILED DESCRIPTION

[0026] An improved-structure air blade comprising an outer housing 1 and an inner housing 2, wherein the outer housing 1 is made of plastic, the outer housing 1 comprising a handheld section 11 and a mounting section 12, wherein an air supply channel 14 is arranged within the handheld section 11, the inner housing 2 being made of metal material, the inner housing 2 being embedded in the mounting section 12 and injection-molded with the outer housing 1 to form an integrated structure, wherein a mounting cavity 25 is arranged within the inner housing 2, wherein a vent hole 15 is arranged obliquely rearward and upward at the upper end of the air supply channel 14, the vent hole 15 being commuting with the air supply channel 14 and the mounting cavity 25, and wherein an associated deflection notch 26 is arranged obliquely across the passage of the vent hole 15 at the rear end section of the inner housing 2.wherein an air passage hole 27, connected to the mounting cavity 25, is arranged at the rear end of the deflection notch 26, wherein the vent hole 15 extends through the deflection notch 26 and is connected to the mounting cavity 25 via an air passage hole 27, wherein the vent hole 15 extends through the rear end of the mounting section 12 to form an opening 151, wherein a locking element 152 is arranged at the opening 151, wherein the vent hole 15 is injection molded together with the outer housing 1 by means of a core pin during injection molding, as in , Fig. 1, Fig. 2, Fig. 3 to Fig. 4 shown.

[0027] The outer casing 1 occupies a significant portion of the entire air blade and is made entirely of plastic, effectively reducing the overall weight. The mounting cavity 25 is where the air blade primarily operates, and the inner casing 2 is made of metal, ensuring the robustness of the mounting cavity 25 and thus the overall strength of the air blade structure. This dual-material design of the air blade casing minimizes excess weight while ensuring the casing's durability, resulting in easier handling and lower manufacturing costs.The inner housing 2 made of metal material can play the role of adjusting the center of gravity, so that the handheld section 11 of the outer housing 1 made of plastic has a better grip, which can effectively improve the ease of use of the air scoop.

[0028] By arranging the offset notch 26 at the passage of the vent bore 15 of the inner housing 2, the vent bore 15 can be directly injection molded. Alternatively, during drilling and processing, the drill only needs to pass through the plastic area without simultaneously having to pass through the metal material area, thus overcoming the technical problems existing in the prior art. An air passage 27 is arranged between the vent bore 15 and the mounting cavity 25, enabling a connection of the air passages to fulfill the air scoop function.The aforementioned technical features of this technical solution reduce the weight of the air vane, while the function of the air vane is realized through mechanism optimization and joint cooperation, thus ensuring the strength of the housing, reducing processing difficulty and improving the product qualification rate.

[0029] The processing described above, using vent holes, leaves an opening 151 at the rear end of the assembly section 12. To allow normal use of the air scoop, a locking element 152 must be provided to close the opening 151. The method for processing the vent hole 15 using a core pin is simpler than drilling with a drill bit, resulting in a lower scrap rate and thus significantly reducing manufacturing costs.

[0030] Furthermore, it is provided that a protective sleeve 16 is arranged on the outer surface of the outer housing 1, wherein the opening 151 and the locking element 152 are covered by the protective sleeve 16, the protective sleeve 16 extending from the mounting section 12 to the outer surface of the handheld section 11, as shown in Fig. 1 and Fig. 2 shown.

[0031] Furthermore, it is provided that a cylinder 22, a switching valve 23 and a shock-absorbing pad 21 are arranged successively from front to rear in the mounting cavity 25, wherein a piston 221 is arranged inside the cylinder 22, wherein the piston 221 moves back and forth inside the cylinder 22, wherein one side surface of the shock-absorbing pad 21 rests against the inner wall of the mounting cavity 25 and the other side surface rests against the switching valve 23, wherein a switching valve plate 231 made of metal is arranged inside the switching valve 23.

[0032] Furthermore, it is provided that a sealing disc 24 made of metal is arranged between the cylinder 22 and the changeover valve 23, wherein the sealing disc 24 has a sealing disc through-hole 241 for internal venting of the changeover valve 23 and the cylinder 22, wherein the sealing disc 24 can be used to resist shocks of the piston 221.

[0033] Furthermore, it is provided that a recess 222 is arranged on the outer circumferential wall of the front section of the cylinder 22, wherein a rubber sleeve 223 is arranged inside the recess 222.

[0034] Furthermore, it is provided that a sealing plug 141 is arranged on the air supply channel 14, wherein an opening and closing pin 143 is arranged inside the air supply channel, the opening and closing pin 143 having a limiting surface 142 that can bear against the sealing plug 141, wherein an elastic element 144 is further arranged inside the air supply channel 14 to exert pressure on the opening and closing pin 143 in the direction of the sealing plug 141, the elastic element 144 being generally designed as a spring, wherein the upper end of the opening and closing pin 143 is located above the sealing plug 141, and wherein a trigger 13 is arranged on the hand-held section 11, the trigger 13 having a release rod 131 that projects into the air supply channel 14 to exert pressure on the opening and closing pin 143.

[0035] Furthermore, it is provided that an air discharge channel 17 is arranged on the handheld section 11, wherein the air discharge opening 171 of the air discharge channel 17 is directed downwards, wherein an air discharge flap 172 is arranged on the air discharge opening 171, and an air discharge bore 173 is arranged on the air discharge flap 172.

[0036] Finally, it should be noted that only one specific embodiment of the present invention is described above. Of course, the present invention is not limited to the embodiment described above, and many variations are possible. All variations that can be directly deduced or associated by a person skilled in the art in this field from the disclosure of the present invention should be considered to be covered by the scope of protection of the present invention. QUOTES INCLUDED IN THE DESCRIPTION

[0000] 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

[0000] CN 217475871U [0002, 0022]

Claims

[1] Air vane with improved structure, comprising an outer casing (1) and an inner casing (2), characterized bythat the outer housing (1) is made of plastic, the outer housing (1) comprising a handheld section (11) and a mounting section (12), wherein an air supply channel (14) is arranged within the handheld section (11), the inner housing (2) being made of metal material, the inner housing (2) being embedded in the mounting section (12) and injection-molded with the outer housing (1) to form an integrated structure, wherein a mounting cavity (25) is arranged within the inner housing (2), wherein a vent hole (15) is arranged obliquely rearward and upward at the upper end of the air supply channel (14), the vent hole (15) being connected to the air supply channel (14) and the mounting cavity (25), and wherein an associated deflection notch (26) is arranged obliquely over the passage of the vent hole (15) at the rear end section of the inner housing (2).wherein an air passage hole (27) is arranged at the rear end of the offset notch (26) and is connected to the mounting cavity (25), wherein the vent hole (15) extends through the offset notch (26) and is connected to the mounting cavity (25) via an air passage hole (27), wherein the vent hole (15) extends through the rear end of the mounting section (12) to form an opening (151), wherein a locking element (152) is arranged at the opening (151), wherein the vent hole (15) is injection molded together with the outer housing (1) by means of a core pin during injection molding or is formed by drilling the outer housing (1) with a drill. [2] Air blade with improved structure according to claim 1, characterized by , that a protective sleeve (16) is arranged on the outer surface of the outer casing (1), wherein the opening (151) and the locking element (152) are covered by the protective sleeve (16). [3] Air vane with improved structure according to claim 2, characterized by , that the protective sleeve (16) extends from the mounting section (12) to the outer surface on the handheld section (11). [4] Air vane with improved structure according to claim 1, characterized by , that in the mounting cavity (25) a cylinder (22), a switching valve (23) and a shock absorbing cushion (21) are arranged successively from front to rear, wherein a piston (221) is arranged inside the cylinder (22), wherein the piston (221) moves back and forth inside the cylinder (22), wherein the rear side surface of the shock absorbing cushion (21) rests against the rear wall of the mounting cavity (25) and the front side surface rests against the switching valve (23). [5] Air vane with improved structure according to claim 4, characterized by, that a sealing disc (24) is arranged between the cylinder (22) and the changeover valve (23), wherein the sealing disc (24) has a sealing disc through-hole (241) for internal venting of the changeover valve (23) and the cylinder (22), wherein the sealing disc (24) is made of metal. [6] Air blade with improved structure according to claim 4 or 5, characterized by , that a switching valve plate (231) is arranged inside the switching valve (23), wherein the switching valve plate (231) is made of metal. [7] Air blade with improved structure according to claim 4, characterized by , that a recess (222) is arranged on the outer circumferential wall of the front section of the cylinder (22), wherein a rubber sleeve (223) is arranged inside the recess (222). [8] Air vane with improved structure according to claim 1, characterized by, that a sealing plug (141) is arranged on the air supply channel (14), wherein an opening and closing pin (143) is arranged inside the air supply channel, the opening and closing pin (143) having a limiting surface (142) that can bear against the sealing plug (141), furthermore, an elastic element (144) is arranged inside the air supply channel (14) to exert pressure on the opening and closing pin (143) in the direction of the sealing plug (141), the upper end of the opening and closing pin (143) being located above the sealing plug (141), a trigger (13) being arranged on the hand-held section (11), the trigger (13) having a release rod (131) that projects into the air supply channel (14) to exert pressure on the opening and closing pin (143). [9] Air vane with improved structure according to claim 1, characterized by, that an air discharge channel (17) is arranged on the hand-held section (11), wherein the air discharge opening (171) of the air discharge channel (17) is directed downwards, wherein an air discharge flap (172) is arranged on the air discharge opening (171), wherein an air discharge bore (173) is arranged on the air discharge flap (172).

Images