Patent Application
20250065362
The present invention relates to a caulking gun.
A conventional dual-cartridge caulking gun includes two push rods arranged in parallel, and a lever of the dual-cartridge caulking gun is pressed to drive the two push rods to synchronously squeeze two sealants with different components, which allows the two sealants to be mixed in a predetermined ratio and solidify as desired. The sealants with different compositions have different fluidity and viscosity, and the force required to squeeze the sealants is different. However, when the lever of the conventional dual-cartridge caulking gun is pressed, the lever can only generated a fixed torque to drive the two push rods to move, and the torque cannot be adjusted to meet different requirements, which causes problems such as incorrect ratio of the two sealants, or incorrect squeezing amounts of the two sealants. In addition, the cartridge sleeve of the conventional dual-cartridge caulking gun has a complicated structure, a large volume and a heavy weight and is inconvenient to operate.
The present invention is, therefore, arisen to obviate or at least mitigate the above-mentioned disadvantages.
The main object of the present invention is to provide a caulking gun, which is convenient to replace sealants, and a torque generated by a lever of the caulking gun is adjustable.
To achieve the above and other objects, the present invention provides a caulking gun, including: a gun body, a cartridge sleeve, two push rods, a driving member, a lever and a switch mechanism. The cartridge sleeve is swingably connected to the gun body and configured to receive two sealants. The two push rods are disposed on the gun body and are movable in a moving direction to squeeze the two sealants. The driving member is movably disposed on the gun body and drives the two push rods to move. The lever is disposed on the gun body and is swingable about a pivot center, and the lever includes an abutting portion which is abuttable against the driving member. The switch mechanism is disposed between the gun body and the lever and includes a switch member being movable between a first position and a second position relative to the gun body. When the switch member is in the first position, the abutting portion generates a first torque to urge the driving member; when the switch member is in the second position, the abutting portion generates a second torque different from the first torque to urge the driving member.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.
Please refer to
The cartridge sleeve 20 is swingably connected to the gun body 10 and configured to receive two sealants (the two sealants may be two separate bottles or be combined into a pair). The two push rods 30 are disposed on the gun body 10 and are movable in a moving direction P to squeeze the two sealants. The driving member 40 is movably disposed on the gun body 10 and drives the two push rods 30 to move. The lever 50 is disposed on the gun body 10 and is swingable about a pivot center R1, and the lever 50 includes an abutting portion 51 which is abuttable against the driving member 40. The switch mechanism 60 is disposed between the gun body 10 and the lever 50 and includes a switch member 61 being movable between a first position and a second position relative to the gun body 10. When the switch member 61 is in the first position and the lever 50 is actuated, the abutting portion 51 generates a first torque to urge the driving member 40; when the switch member 61 is in the second position and the lever 50 is actuated, the abutting portion 51 generates a second torque different from the first torque to urge the driving member 40. Therefore, the cartridge sleeve 20 is convenient to replace the two sealants, and a force that the abutting portion 51 urging the driving member 40 to move is changeable, and a force or a distance that the two push rods 30 pushing the two sealants is adjustable according to properties of the two sealants.
The gun body 10 includes an end surface 11 facing toward the cartridge sleeve 20 and an extending arm 12 extending from the end surface 11 in a direction remote from the driving member 40, and the two push rods 30 are disposed through the end surface 11. The extending arm 12 is located at a side of the two push rods 30 in a radial direction lateral to the moving direction P, and the cartridge sleeve 20 is swingably connected with the extending arm 12. In the moving direction P, the end surface 11 and the cartridge sleeve 20 define a gap G therebetween. Therefore, the cartridge sleeve 20 is smoothly swung, and the gap G is configured to receive a head portion of the two sealants, which provides a wide application range. Specifically, the cartridge sleeve 20 includes a barrel portion 21 and a connecting portion 22 radially protruding from the barrel portion 21, and the barrel portion 21 defines a receiving hole 211 configured to receive the two sealants. The connecting portion 22 is detachably connected with the gun body 10 by a first pin member 23 so that the cartridge sleeve 20 can be replaced quickly to assemble another two sealants of different size. For example, as shown in
Preferably, the extending arm 12 has a first blocking portion 121, and the cartridge sleeve 20 has a second blocking portion 24. When the cartridge sleeve 20 is swung in a direction away from the end surface 11, the first blocking portion 121 is interferingly blocked with the second blocking portion 24 in a swinging direction of the cartridge sleeve 20 so as to restrict a rotation angle of the cartridge sleeve 20 and avoid over-swinging. In this embodiment, the first blocking portion 121 is located between the end surface 11 and the first pin member 23 and is a blocking shoulder disposed on a side of the extending arm 12, and the second blocking portion 24 is a blocking projection disposed on a side of one of the two protruding ears 222 remote from the barrel portion 21. Therefore, a maximum rotation angle of the cartridge sleeve 20 relative to the end surface 11 is approximately limited to 90 degrees, which is convenient to assemble and disassemble the two sealants and provides good structural strength. Preferably, the caulking gun 1 further includes a first elastic member 90 elastically abutted against and between the connecting portion 22 and the gun body 10. In this embodiment, the first elastic member 90 is a torsion spring sleeved to the first pin member 23, which has a simple structure and is easy to assemble. When the cartridge sleeve 20 is released, the first elastic member 90 is elastically abutted against the connecting portion 22, and the cartridge sleeve 20 is automatically swung relative to the gun body 10, which is easy to operate. In other embodiments, the maximum rotation angle of the cartridge sleeve is changeable to meet different requirements; the first elastic member may be a flat spring or other elastic structures.
The caulking gun 1 further includes an engaging mechanism 70 disposed on a side of the gun body 10 remote from the lever 50, and the cartridge sleeve 20 is swingably connected to a side of the gun body 10 adjacent to the lever 50. The engaging mechanism 70 is releasably engaged with the cartridge sleeve 20 in the swinging direction of the cartridge sleeve 20, and the cartridge sleeve 20 trends to swing away from the end surface 11 due to gravity when the engaging mechanism 70 releases the cartridge sleeve 20. Specifically, the engaging mechanism 70 includes an engaging member 71, a second pin member 72 connecting the engaging member 71 with the gun body 10 and a second elastic member 73. The engaging member 71 includes a first end portion 711 and a second end portion 712 located at two opposite sides of the second pin member 72, and the first end portion 711 includes a hooked portion 713 being blockable with the connecting portion 22. The second elastic member 73 is elastically abutted against and between the second end portion 712 and the gun body 10 so that the engaging member 71 has a tendency to swing in a direction toward the first end portion 711. By pressing the second end portion 712 to compress the second elastic member 73, the hooked portion 713 is moved away from the connecting portion 22, and the cartridge sleeve 20 can be swung. Preferably, the first end portion 711 further includes a protruding portion 714 spaced apart from the hooked portion 713, and the flange 221 is engageable between the hooked portion 713 and the protruding portion 714. The flange 221 has a recession 224 disposed thereon and corresponding to the hooked portion 713, and at least a portion of the hooked portion 713 is engaged within the recession 224 for stable engagement. In the moving direction P, the engaging member 71 non-protrudes beyond the extending arm 12 so that the hooked portion 713 effectively resists a torque generated by the cartridge sleeve 20 so as to have stable engagement and avoid damage of components. As viewed in the radial direction, the second pin member 72 is located between the switch mechanism 60 and the first pin member 23, which is convenient to operate.
As viewed in the radial direction, a first distance D1 is defined between the pivot center R1 of the lever 50 and a pivot center R2 of the cartridge sleeve 20, and a second distance D2 is defined between the end surface 11 and the pivot center R2 of the cartridge sleeve 20. The second distance D2 is larger than or equal to ⅕ (preferably ¼) of the first distance D1, which ensures that the pivot center R2 of the cartridge sleeve 20 and the switch mechanism 60 keep a sufficient distance therebetween for easy and smooth operation.
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In this embodiment, the two push rods 30 are arranged up and down, and the driving member 40 is directly connected with one of the two push rods 30; the caulking gun 1 further includes a connecting member 80, and the two push rods 30 are detachably connected with the connecting member 80 so that the two push rods 30 are co-movable. When the lever 50 is actuated, the two push rods 30 are moved asynchronously, one of the two sealants with lower viscosity corresponds to one of the two push rods 30 indirectly connected with the driving member 40, or the switch member 61 is operated to adjust the pushing force and/or pushing distance of the two push rods 30 so as to have desired squeezing effect. In other embodiments, the two push rods may be arranged left and right; the driving member may be directly connected with the two push rods so that the two push rods are moved synchronously to provide the same pushing force.
Specifically, an imaginary plane F passing through the pivot center R2 of the cartridge sleeve 20 and parallel to the moving direction P is defined. When the switch member 61 is moved from the first position to the second position, the pivot center R1 of the lever 50 is changed from a side of the imaginary plane F to another side of the imaginary plane F so as to provide the first torque or the second torque and good caulking effect. In this embodiment, the first arcuate groove 52 and the second arcuate groove 13 are through grooves being circumferentially closed respectively; as viewed in the radial direction, the first arcuate groove 52 and the second arcuate groove 13 are partially overlapped with each other when the lever 50 is not actuated, and the first shaft 62 is closer to the abutting portion 51 than the second shaft 63. When the lever 50 is actuated and the first shaft 62 serves as the pivot center R1, the second shaft 63 is movable along the second arcuate groove 13, and the first shaft 62 and the first arcuate groove 52 are immovable relative to each other since the lever 50 is interfered with the gun body 10 in a swinging direction of the lever 50. The lever 50 can be smoothly swung without being restricted by the switch member 61, and the switch mechanism 60 has a compact structure and a small volume.
The gun body 10 further includes an assembling hole 14, and the switch mechanism 60 further includes a positioning member 64 disposed within the assembling hole 14 and surrounding the switch member 61. The positioning member 64 is elastically deformable to restrict the switch member 61 to one of the first position and the second position, which has a simple structure and is easy to assemble. In this embodiment, the positioning member 64 includes a first positioning groove 641 and a second positioning groove 642, the first positioning groove 641 is remote from the abutting portion 51 relative to the second positioning groove 642. When the switch member 61 is located within the first positioning groove 641, the switch member 61 is free of interference with the first shaft 62 and the second shaft 63. When the switch member 61 is located within the second positioning groove 642, the switch member 61 is interfered with the second shaft 63, which has a simple structure and is easy to assemble. A moving direction of the switch member 61 is lateral to an extending direction of the second arcuate groove 13 so as to be stably blocked with the second shaft 63.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
