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DE-112022005547-B4 - Grease filling device for manual grease gun

DE112022005547B4DE 112022005547 B4DE112022005547 B4DE 112022005547B4DE-112022005547-B4

Abstract

A grease filling device for a manual grease gun, wherein the device has the following features: a cylindrical storage tank (100) configured to store grease, which is supplied through a check valve (102) at one end of the same; a cover (200) having an air passage (202) on one side to allow air to enter the cargo tank (100) and a through-hole (204) formed in the middle of the same, and configured to be screwed onto an upper section (104) of the cargo tank (100); a cylinder (300) which is vertically coupled to the cover (200) at the center of a lower surface of the cover (200), creating a coaxial passage with the through-hole (204) of the cover (200), and which extends adjacent to a bottom section of the loading tank (100); a piston (400) which is coupled to an inner surface of the cylinder (300) via a packing element (410) at a bottom section thereof in a sealed manner and is configured to be detachably connected to a manual grease gun (1) at a top section thereof, making it possible for the piston to rise and fall within the cylinder (300) by moving the manual grease gun (1) up and down; a first valve arrangement (500) located in a lower part of the piston (400) to open a passage in response to the piston (400) descending, in order to draw the grease within the cylinder (300) into the piston (400) by a pumping force, or to close the passage in response to the piston (400) rising; and a second valve assembly (600) installed in the lower part of the cylinder (300) to close the passage in response to the piston (400) descending, or to open the passage in response to the piston descending (400) rises to draw the grease inside the charging tank (100) into the cylinder (300) by means of the pumping force.

Inventors

  • Duk-haeng Cho

Assignees

  • Duk-haeng Cho

Dates

Publication Date
20260513
Application Date
20221021
Priority Date
20211119

Claims (7)

  1. A grease filling device for a manual grease gun, wherein the device has the following features comprising: a cylindrical storage tank (100) configured to store grease supplied through a check valve (102) at its base; a cover (200) having an air passage (202) on one side to allow air into the storage tank (100) and a through-hole (204) formed at its center, configured to be screwed onto an upper section (104) of the storage tank (100); a cylinder (300) coupled vertically to the cover (200) at its center on a lower surface, forming a coaxial passage with the through-hole (204) of the cover (200), and extending adjacent to a bottom section of the storage tank (100); a piston (400) which is coupled to an inner surface of the cylinder (300) via a packing element (410) at a bottom section thereof in a sealed manner and is configured to be detachably connected to a manual grease gun (1) at a top section thereof, making it possible for the piston to rise and fall within the cylinder (300) by moving the manual grease gun (1) up and down; a first valve device (500) arranged in a lower part of the piston (400) to open a passage in response to the piston (400) falling in order to draw grease into the piston (400) within the cylinder (300) by a pumping force, or to close the passage in response to the piston (400) rising; and a second valve assembly (600) installed in the lower part of the cylinder (300) to close the passage in response to the piston (400) sinking, or to open the passage in response to the piston (400) rising, in order to draw the grease inside the charging tank (100) into the cylinder (300) by the pumping force.
  2. The device according to Claim 1 , wherein the piston (400) has a screw with an internal thread (404) formed on a top section thereof, which is to be coupled to a screw with an external thread (10a) formed on a front opening section of the manual grease gun (1).
  3. The device according to Claim 1 , wherein the first valve assembly (500) has the following features: a first head (512) positioned on an upper surface of an annular first stop bead (402) formed at a predetermined height from the bottom section of the piston (400); a first shaft (510) connected to a center of a lower surface of the first head (512) to pass through a center of the first stop bead (402); a first nut (520) attached to a bottom section of the first shaft (510); and a first coil spring (530) positioned between an edge of the lower surface of the first stop bead (402) and an upper surface of the first nut (520) to apply elasticity so that the first head (512) sits firmly on the upper surface of the first stop bead (402).
  4. The device according to Claim 3 , wherein the first head (512), the first shaft (510), the first nut (520) and the first coil spring (530) are supported on the first stop bead (402) with a predetermined gap by an inner surface of the piston (400) so that the first head (512) rises and falls to open and close the passage on the base of the first head (512) which contacts or moves away from the upper surface of the first stop bead (402).
  5. The device according to Claim 1 , wherein the second valve assembly (600) has the following features: an annular housing (610) positioned on a lower surface of an annular second stop bead (302) formed at a predetermined height within the cylinder (300); a second head (622) positioned on an upper surface of the housing (610); a second shaft (620) connected to the center of a lower surface of the second head (622) to pass through a center of the housing (610); a second nut (630) attached to a bottom section of the second shaft (620); a second coil spring (640) positioned between an inner edge of the lower surface of the housing (610) and an upper surface of the second nut (630) to apply elasticity so that the second head (622) sits firmly on the upper surface of the housing (610); a third nut (650) attached to a bottom section of the cylinder (300); and a third coil spring (660) positioned between an outer edge of the lower surface of the housing (610) and an upper surface of the third nut (650) to apply elasticity so that the housing (610) rises and falls.
  6. The device according to Claim 5 , wherein the housing (610) has a plurality of recesses (612) formed on an outer peripheral surface thereof, wherein Passages in upper, lower and lateral directions are open at predetermined intervals along the circumferential direction of the housing to collect the grease remaining in the upper part of the cylinder (300) into the lower part of the second valve assembly (600) when the housing (610) is separated from the second stop bead (302) by a pumping force of the downward-moving piston.
  7. The device according to Claim 1 , which further comprises an annular pressure plate (700) positioned between an inner surface of the loading tank (100) and an outer surface of the cylinder (300) to press down the grease inside the loading tank (100).

Description

Technical field The invention relates to a grease filling device for a manual grease gun and in particular to a grease filling device for a manual grease gun which can connect the manual grease gun to a charging tank and load the grease into the charging tank using a pumping action. Technical background Traditional manual grease guns, as in 1 Illustrated, they consist of a body 10 in the shape of a tube containing grease, and a nozzle 15 located at the front of the body 10 to release the grease. The fat inside the body 10 is dispensed to the outside via a pumping mechanism which includes a dispensing element (not shown) mounted inside the body 10 in a piston-like manner and a dispensing handle 13 which is connected to the dispensing element via a connection 14. In this case, a removable cap 12 is screwed onto the front section of the body 10, the nozzle 15 is connected to the cap 12 via the connection 14, and the nozzle 15 discharges the grease contained in the body 10 to the outside when the grease is pumped. In the drawing, the unspecified reference numeral 17 denotes a pull ring connected to the output element. However, conventional manual grease guns configured in this way have a disadvantage in that, when all the grease inside the body 10 is used up, refilling is carried out by detaching the cap 12 from the front section of the body 10, connecting a front opening section of the body 10 to a charging tank (not shown), and using a direct suction method via the pump mechanism to load the grease from the charging tank into the body 10. This results in air inclusions forming at a suction point during several suction operations, leading to improper loading. In addition, a significant problem arises when rags are used to clean the grease that has accumulated on the front opening section of the body 10, resulting in a substantial amount of residual grease and increased grease consumption. If the contaminated rags are left at the work site, this not only causes inconvenience for workers and the facility due to grease stains, but also poses pollution risks to the environment. The CH 166 887 A Disclosing a hydraulic grease gun, the grease gun comprises a container with a movable bottom connected to a piston arranged in a hydraulic pressure cylinder. Hydraulic fluid is forced into the pressure cylinder by means of a first piston pump. Lubricant is then delivered to a point of use by means of a second piston pump, the piston pumps being driven by a common actuating lever. The DE 10 2022 118 743 B4 reveals a grease filling device that includes an oil cup, a removable guide seat, a screw rod, a piston, a press section and a rotary actuation section. The US 2007 / 0 034 451 A1 Disclosure reveals a pneumatic grease applicator in which grease is continuously supplied from an external source through a bottom nozzle of a container under a pneumatically induced driving force. Sealing elements are provided between a holding device that holds a bearing onto which grease is to be applied and a pressure device, as well as between the side wall of the container, to prevent grease leakage. The KR 10 2019 0 117 980 A reveals a grease injection device for a grease gun. State-of-the-art technical documents Patent document Patent document 1: KR 20 0 415 572 Y1 revelation Technical problem statement The present invention serves to solve the above problems, and it is an object thereof to provide a grease filling device for a manual grease gun which is capable of being filled quickly and completely without air entrapment, of preventing grease accumulation on a front opening section of the manual grease gun in order to reduce grease consumption, and of improving environments around the work site by eliminating the use of rags for cleaning the manual grease gun. Technical solution To solve the above problem, a grease filling device for a manual grease gun comprises a cylindrical storage tank configured to hold grease supplied through a check valve at its base; a cover having an air passage on one side to introduce air into the storage tank and a through-hole formed at its center, configured to be screwed onto an upper section of the storage tank; a cylinder vertically coupled to the cover at its center, forming a coaxial passage with the through-hole of the cover, and extending adjacent to a base section of the storage tank; a piston sealed to an inner surface of the cylinder via a packing element at its base section, configured to be detachably connected to a manual grease gun at its upper section, allowing the piston to rise and fall within the cylinder by moving the manual grease gun up and down; and a A first valve assembly, arranged in a lower part of the piston, to open a passage in response to the piston descending, in order to draw the grease inside the cylinder into the piston by a pumping force, or to close the passage in response to the piston descending, and a second valve assembly, installed in the lower part of the cylinder