AU2015201378A1

AU2015201378A1 - Floor closer

Info

Publication number: AU2015201378A1
Application number: AU2015201378A
Authority: AU
Inventors: Zhou Xiaoming
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-03-18
Filing date: 2015-03-17
Publication date: 2015-10-08
Also published as: KR20150108782A; JP2015180799A

Abstract

A floor closer includes a main body, a piston, an elastic member, a force adjustment assembly, an end cap, and a tail cap. The main body has an accommodation cavity and a first accommodation hole. The accommodation cavity 5 has two open ends. The first accommodation hole communicates with the accommodation cavity. The piston and the elastic member are accommodated in the accommodation cavity. One end of the elastic member is against the piston. The force adjustment assembly includes an adjustment nut, a bevel gear, an adjustment shaft, and a force adjustment rod. The adjustment nut, the bevel gear, and the 10 adjustment shaft are accommodated in the accommodation cavity. One end of the adjustment nut is against another end of the elastic member opposite the piston. The bevel gear is against another end of the adjustment nut opposite the elastic member. One end of the adjustment shaft is inserted through the bevel gear and the adjustment nut. One end of the force adjustment rod is inserted through the first 15 accommodation hole to lean against the bevel gear. Another end of the force adjustment rod extends out of the main body through the first accommodation hole. The end cap and the tail cap are adapted to seal the two open ends of the accommodation cavity, respectively. One end of the piston, opposite the elastic member, is against the tail cap. Another end of the adjustment shaft is against the 20 end cap. The floor closer is capable of adjusting the force to close the door. -II 130 f h13

Description

Australian Patents Act 1990 - Regulation 3.2 ORIGINAL COMPLETE SPECIFICATION STANDARD PATENT Invention Title Floor closer The following statement is a full description of this invention, including the best method of performing it known to me/us:- BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor closer. 5 2. Description of the Prior Art A glass door generally uses a floor closer (known as a floor spring). It is necessary to embed a cement box in advance. This increases labor and influences the progress of work. An improved floor closer is a piston-type floor closer. Compared to the floor spring, there is no need to embed the cement box in advance 10 for the piston-type floor closer. It is convenient for use. However, this piston-type floor closer only has a stationary force to close the door. The force to close the door is not adjustable. The same type of floor closer cannot be applied to different specifications of glass doors. Making a selection brings problems to clients. 15 Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems. SUMMARY OF THE INVENTION The primary object of the present invention is to provide a floor closer capable of adjusting the force to close the door. 20 In order to achieve the aforesaid object, the floor closer of the present invention comprises a main body, a piston, an elastic member, a force adjustment assembly, an end cap, and a tail cap. The main body has an accommodation cavity and a first accommodation hole. The accommodation cavity has two open ends. The first accommodation hole communicates with the accommodation cavity. The piston is 25 accommodated in the accommodation cavity. The elastic member is accommodated in the accommodation cavity. One end of the elastic member is against the piston. The force adjustment assembly comprises an adjustment nut, a bevel gear, an adjustment shaft, and a force adjustment rod. The adjustment nut, the bevel gear, and the adjustment shaft are accommodated in the accommodation cavity. One end of the adjustment nut is against another end of the elastic member opposite the piston. The bevel gear is against another end of the adjustment nut 5 opposite the elastic member. One end of the adjustment shaft is inserted through the bevel gear and the adjustment nut. One end of the force adjustment rod is inserted through the first accommodation hole to lean against the bevel gear. Another end of the force adjustment rod extends out of the main body through the first accommodation hole. The end cap and the tail cap are adapted to seal the two 10 open ends of the accommodation cavity, respectively. One end of the piston, opposite the elastic member, is against the tail cap. Another end of the adjustment shaft is against the end cap. In an embodiment, the floor closer further comprises a camshaft and a roller assembly. The main body further has a second accommodation hole. The middle 15 portion of the piston is formed with a first through hole, a second through hole, and a third through hole. The first through hole communicates with the second through hole. One end of the roller assembly is accommodated in the first through hole. Another end of the roller assembly is accommodated in the second through hole. The camshaft is inserted through the third through hole. One end of the camshaft 20 extends out of the main body through the second accommodation hole. The middle portion of the roller assembly is against the camshaft. In an embodiment, the floor closer further comprises a first bearing and a second bearing fitted on two ends of the camshaft. The first bearing and the second bearing are deep groove ball bearings. The deep groove ball bearings each have an inner 25 annular height higher than an outer annular height. In an embodiment, the floor closer further comprises a safety valve. The end of the piston is formed with a first piston hole. The safety valve is accommodated in the first piston hole and leans against the tail cap. In an embodiment, the floor closer further comprises a base assembly. The 30 base assembly comprises an installation base, a connecting shaft, and a stop cover. The installation base is installed on an external support. The installation base has a base accommodation trough. The connecting shaft is accommodated in the base accommodation trough. The stop cover is disposed on the installation base to cover the connecting shaft. The middle portion of the connecting shaft is formed with a square shaft accommodation trough. The end of the camshaft, extending out of the main body, is accommodated in the square shaft accommodation trough. 5 In an embodiment, the installation base is formed with a plurality of first adjustment holes, a plurality of second adjustment holes, and a plurality of third adjustment holes. The plurality of first adjustment holes cooperate with a plurality of fasteners to hold against the connecting shaft for left and right adjustment of the connecting shaft. The plurality of second adjustment holes cooperate with a plurality 10 of fasteners for up and down adjustment of the installation base. The plurality of third adjustment holes cooperate with a plurality of fasteners to hold against the connecting shaft for front and rear adjustment of the connecting shaft. In an embodiment, the installation base and the stop cover are in a circular shape. 15 In an embodiment, the floor closer further comprises a closing door valve and a speed adjustment valve disposed on the main body. The main body is formed with an oil passageway, a first oil hole, and a second oil hole. First ends of the closing door valve and the speed adjustment valve are located inside the main body. Second ends of the closing door valve and the speed adjustment valve extend out of 20 the main body. The oil passageway, the first oil hole, and the speed adjustment valve form a first hydraulic pressure oil passage. The oil passageway, the second oil hole, and the closing door valve form a second hydraulic pressure oil passage. In an embodiment, the second ends of the closing door valve and the speed adjustment valve, extending out of the main body, are perpendicular to an extending 25 direction of the accommodation cavity. In an embodiment, the floor closer further comprises a first outer cover and a second outer cover. The first outer cover and the second outer cover are detachably disposed at two opposing sides of the main body. Through the force adjustment assembly, when the force adjustment rod of the 30 floor closer is turned clockwise, the force adjustment rod brings the bevel gear to rotate, and the bevel gear brings the adjustment shaft to rotate, and then the adjustment shaft brings the adjustment nut to move and compress the elastic member so as to enhance the force to close the door. When the force adjustment rod is turned counterclockwise, the force adjustment rod brings the bevel gear to rotate, and the bevel gear brings the adjustment shaft to rotate, and then the 5 adjustment shaft brings the adjustment nut to move and release the elastic member so as to lower the force to close the door. Thus, the force to close the door can be adjustable. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view of the floor closer in accordance with an embodiment of 10 the present invention; FIG. 2 is an exploded view showing the exterior parts of the main body of the floor closer of FIG. 1; FIG. 3 is a sectional view taken along line III-III of FIG. 1; FIG. 4 is an enlarged view of FIG. 3; 15 FIG. 5 is a schematic view showing the installation base and the connecting shaft of the floor closer of FIG. 1; FIG. 6 is a schematic view showing the floor closer of FIG. 1 when in use; FIG. 7 is a sectional view showing the main body of the floor closer of FIG. 1 seen from another angle; and 20 FIG. 8 and FIG. 9 are schematic views showing the oil passages. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. Referring to FIG. 1 and FIG. 2, a floor closer 200 in accordance with an 25 embodiment of the present invention comprises a main body 10, a piston 20, an elastic member 30, a force adjustment assembly 40, an end cap 50, and a tail cap 60.

The main body 10 is substantially in a rectangular shape. The main body 10 is formed by extrusion, which is manufactured conveniently. The main body 10 has an accommodation cavity 12 and a first accommodation hole 14. The accommodation cavity 1 extends longitudinally from one end of the 5 main body 10 to another end of the main body 10. The accommodation cavity 12 has two open ends located at two end surfaces of the main body 10. The first accommodation hole 14 is disposed on a side wall of the main body 10. The first accommodation hole 14 communicates with the accommodation cavity 12. The extending direction of the first accommodation hole 14 is perpendicular to the 10 extending direction of the accommodation cavity 12. The main body 10 has an accommodation groove 16 which extends longitudinally from one end of the main body 10 to another end of the main body 10. The accommodation cavity 12 and the accommodation groove 16 are parallel. The main body 10 further has a second accommodation hole (not shown in the 15 drawings). The second accommodation hole is disposed at one side of the main body 10 opposite the accommodation groove 16. The second accommodation hole communicates with the accommodation cavity 12. The extending direction of the second accommodation hole is perpendicular to the extending direction of the accommodation cavity 12. The extending direction of the second accommodation 20 hole is perpendicular to the extending direction of the first accommodation hole 14. Referring to FIG. 2 and FIG. 3, the piston 20 is accommodated in the accommodation cavity 12. The piston 20 is substantially in a cylindrical shape. The piston 20 comprises a first piston wall 21, a second piston wall 22, a first piston head 23, and a second piston head 24. Two ends of the first piston wall 21 are 25 connected with the first piston head 23 and the second piston head 24, respectively. One end of the second piston wall 22 is connected with the second piston head 24. A first gap (not numbered in the drawings) is defined between another end of the second piston wall 22 and the first piston head 23. A second gap (not numbered in the drawings) is defined between the first piston wall 21 and the second piston wall 30 22. The first piston wall 21 is formed with a first through hole (not numbered in the drawings). The second piston wall 22 is formed with a second through hole (not numbered in the drawings). The first through hole and the second through hole are coaxial. The first through hole and the second through hole face the second gap to communicate with each other. The first piston wall 21 is further formed with a third through hole. The third through hole faces the first gap. 5 The first piston head 23 is formed with a first piston hole 232. The second piston head 24 is formed with a second piston hole (not shown in the drawings). The first piston hole 232 communicates with the first gap and the second gap. The elastic member 30 is accommodated in the accommodation cavity 12. One end of the elastic member 30 is against the second piston head 24. In this 10 embodiment, the elastic member 30 is a spiral spring. It is understood that in other embodiments, the elastic member 30 can be in other shapes. Referring to FIG. 2 and FIG. 4, the force adjustment assembly 40 comprises an adjustment nut 41, a bevel gear 42, an adjustment shaft 43, and a force adjustment rod 44. The adjustment nut 41, the bevel gear 42, and the adjustment shaft 43 are 15 accommodated in the accommodation cavity 12. One end of the adjustment nut 41 is against another end of the elastic member 30 opposite the piston 20. The bevel gear 42 is against another end of the adjustment nut 41 opposite the elastic member 30. One end of the adjustment shaft 43 is inserted through the bevel gear 42 and the adjustment nut 41. One end of the force adjustment rod 44 is inserted through 20 the first accommodation hole 14 to lean against the bevel gear 42. Another end of the force adjustment rod 44 extends out of the main body 10 through the first accommodation hole 14 and to be located outside the main body 10 and perpendicular to the side wall of the main body 10, namely, perpendicular to the extending direction of the accommodation cavity 12. 25 The end cap 50 and the tail cap 60 are disposed at the two ends of the main body 10, respectively, to seal the two open ends of the accommodation cavity 12. Preferably, in order to ensure their seal function, the present invention further comprises an end cap seal ring 52 fitted on the end cap 50 and a tail cap seal ring 62 fitted on the tail cap 60. 30 Another end of the piston 20, opposite the elastic member 30, is against the tail cap 60. Another end of the adjustment shaft 43 is against the end cap 50.

Through the force adjustment assembly 40, when the force adjustment rod 44 of the floor closer 200 is turned clockwise, the force adjustment rod 44 brings the bevel gear 42 to rotate, and the bevel gear 42 brings the adjustment shaft 43 to rotate, and then the adjustment shaft 43 brings the adjustment nut 41 to move and compress the 5 elastic member 30 so as to enhance the force to close the door. When the force adjustment rod 44 is turned counterclockwise, the force adjustment rod 44 brings the bevel gear 42 to rotate, and the bevel gear 42 brings the adjustment shaft 43 to rotate, and then the adjustment shaft 43 brings the adjustment nut 41 to move and release the elastic member 30 so as to lower the force to close the door. Thus, the 10 force to close the door can be adjustable, enabling the same type of floor closer to be applied to glass doors of different specifications. The client doesn't worry about which type of floor closer. Preferably, the floor closer 200 further comprises a safety valve 70. The safety valve 70 is accommodated in the first piston hole 232 and leans against the tail cap 15 60. Referring to FIG. 2, preferably, the floor closer 200 further comprises a camshaft 80, a first bearing 90, a second bearing 100, and a roller assembly 110. The camshaft 80 comprises a first connecting 81, a cam disc 82, a second connecting shaft 83, and a square shaft 84 which are connected in series. Wherein, 20 the cam disc 82 is an involute cam disc. Referring to FIG. 3, a portion of the camshaft 80 is accommodated in the accommodation cavity 12, and the square shaft 84 of the camshaft 80 extends out through the second accommodation hole of the main body 10 to be located outside the main body 10. Preferably, in order to ensure the seal function, the floor closer 200 further comprises a seal cover 120. The seal 25 cover 120 is adapted to seal the second accommodation hole. The middle portion of the seal cover 120 is formed with a through hole. The square shaft 84 extends out of the seal cover 120 through the through hole. The first bearing 90 is fitted on the first connecting shaft 81. The second bearing 100 is fitted on the second connecting shaft 83. In order to enhance the seal function, the second bearing 100 30 and the seal cover 120 are provided with seal rings (not shown in the drawings). Preferably, the first bearing 90 and the second bearing 100 are deep groove ball bearings. The deep groove ball bearings each have an inner annular height higher than an outer annular height. A normal deep groove ball bearing has an inner annular height equal to an outer annular height. The conventional floor closer uses a needle bearing. The needle bearing is unable to bear the axial force, which needs a spacer disposed at the bottom to 5 support the axial force brought by the door to the camshaft 80. Due to flat contact, the camshaft 80 and the space will generate a great friction during rotation. This will influence the smoothness of opening and closing the door. Once the spacer suffers a lot of wear and tear, the needle bearing will be damaged to shorten the service life of the product. The present invention uses the deep groove ball bearings having the 10 inner annular height higher than the outer annular height to bear the axial force so as to improve the friction brought by the door, such that the door can be opened or closed smoothly to enhance the service life of the product. The middle portion of the roller assembly 110 is located in the second gap of the piston 20. One end of the roller assembly 110 is accommodated in the first through 15 hole, and another end of the roller assembly 110 is accommodated in the second through hole. The outer wall of the middle portion of the roller assembly 110 is against the outer wall of the cam disc 82. Referring to FIG. 1, the floor closer 200 further comprises a base assembly 130. The base assembly 130 comprises an installation base 131, a connecting shaft 132, 20 and a stop cover 133. The base assembly 130 further comprises expansion screws 134, fixing screws 135, first adjustment screws 136, and second adjustment screws 137. Referring to FIG. 5, the installation base 131 is in a circular shape. The middle portion of the installation base 131 has a base accommodation trough (not shown in 25 the drawings). The connecting shaft 132 is accommodated in the base accommodation trough. The installation base 131 is formed with four installation holes 1311. The four installation holes 1311 are located around the base accommodation trough. The installation base 131 is further formed with four first adjustment holes 1312, four second adjustment holes 1313, and two third adjustment 30 holes 1314. The four first adjustment holes 1312 and the four second adjustment holes 1313 are located around the base accommodation trough. The two third adjustment holes 1314 are located at two sides of the base accommodation trough, respectively. The middle portion of the connecting shaft 132 is formed with a square shaft accommodation trough 1321. All of the installation base 131, the connecting shaft 132, and the stop cover 133 5 are made of type 304 stainless steel. Referring to FIG. 1 and FIG. 6, to install the floor closer 200, an external support, such as the floor, is made four holes by drilling, and the four expansion screws 134 are placed into the four holes, and then the four fixing screws 135 are screwed and locked, such that the installation base 131 is installed on the floor. 10 The connecting shaft 132 is placed in the base accommodation trough, and then one end of a glass door 300 is placed in the accommodation groove 16 of the main body 10. A press plate 141 and two spacers 142 are placed in the accommodation groove 16. The press plate 141, one spacer 142, the glass door 300, and the other spacer 142 are arranged in order. The other end of the glass door 300 is fixed with 15 a door clip 400. One end of the camshaft 80 extends out of the seal cap 120, namely, one end of the square shaft 84 of the camshaft 80, opposite the second connecting shaft 83, is accommodated in the square shaft accommodation trough 1321 of the connecting shaft 132. Four first adjustment screws 136 are inserted into the four first adjustment holes 1312 and locked, respectively. Four second 20 adjustment screws 137 are inserted into the four second adjustment holes 1313 and locked, respectively. Two first adjustment screws 136 are inserted into the two third adjustment holes 1314 and locked, respectively. After that, the stop cover 133 is disposed on the installation base 13 to cover the connecting shaft 132 so as to complete installation of the floor closer 200. 25 There is no need to embed a cement box on the floor in advance for using the floor closer 200. The floor closer 200 can be installed directly, is convenient for use, saves manpower, and accelerates the progress of work. The floor closer 200 is smaller than the floor spring, which is convenient for use. When it is necessary to hide the base assembly 130, the floor can be provided with a corresponding 30 accommodation trough to receive the base assembly 130. There is no need to fill cement, and it can be operated easily.

Preferably, the installation base 131 and the stop cover 133 are in a circular shape. They are pleasing to the eye and won't hit and damage cleaning tools during cleaning. The connecting shaft 132 of the base assembly 130 is accommodated in the 5 base accommodation trough of the installation base 131, with the six first adjustment screws 136 to cooperate with the four first adjustment holes 1312 and the two third adjustment holes 1314 so as to adjust the position of the connecting shaft 132 relative to the installation base 131 and to fix the connecting shaft 132 on the installation base 131. Wherein, the four first adjustment holes 1312 cooperate with 10 four of the first adjustment screws 136 to achieve left and right adjustment of the connecting shaft 132; the two third adjustment holes 1314 cooperate with two of the first adjustment screws 136 to achieve front and rear adjustment of the connecting shaft 132; and the four second adjustment holes 1313 cooperate with the four second adjustment screws 137 to achieve up and down adjustment of the installation base 15 131. Because one end of the square shaft 84 is accommodated in the connecting shaft 132 and the connecting shaft 132 is accommodated in the base accommodation trough of the installation base 131, the up and down adjustment of the installation base 131 and the front and rear adjustment as well as the left and 20 right adjustment of the connecting shaft 132 also bring up and down, front and rear, left and right adjustment of the square shaft 84. This can offset the deviation of installation and lower the requirements for installation, so it is very convenient for installation. It is understood that the number of the first adjustment holes 1312 is not limited 25 to four, the number of the second adjustment holes 1313 is not limited to four, and the number of the third adjustment holes 1314 is not limited to two. The number can be adjustable according to the size of the installation base 131 and the connecting shaft 132. The fasteners to cooperate with the first adjustment holes 1312, the second adjustment holes 1313, and the third adjustment holes 1314 are not limited to 30 the first adjustment screws 136 and the second adjustment screws 137, which can be bolts, cap screws, or the like. Preferably, referring to FIG. 2, the floor closer 200 further comprises a closing door valve 150 and a speed adjustment valve 160. Referring to FIG. 7, the main body 10 is provided with an oil passageway 170, a first oil hole 171, and a second oil hole 172. Both the closing door valve 150 and the speed adjustment valve 160 are disposed on the main body 10. First ends of 5 the closing door valve 150 and the speed adjustment valve 160 are located inside the main body 10, and second ends of the closing door valve 150 and the speed adjustment valve 160 extend out of the main body 10 and are perpendicular to the side wall of the main body 10, namely, perpendicular to the extending direction of the accommodation cavity 12. The second ends extending out of the main body 10 are 10 adjustment ends. The oil passageway 170, the first oil hole 171, and the speed adjustment valve 160 form a first hydraulic pressure oil passage. The oil passageway 170, the second oil hole 172, and the closing door valve 150 form a second hydraulic pressure oil passage. Referring to FIG. 3, when the door is opened, the camshaft 80 of the floor closer 15 200 is fixed and the other parts are turned along with the door. When the camshaft 82 is fixed, the roller assembly 110 leaning against the outer wall of the cam disc 82 will have a relative motion on the curved surface of the cam disc 82. Because the cam disc 82 is designed to be involute. The radius becomes increasingly large, so the roller assembly 110 is farther away from the axis of the cam disc 82. The piston 20 20 is pushed to approach the elastic member 30 so as to compress the elastic member 30 and increase the stored energy of the spring. The hydraulic pressure oil at the rear end of the elastic member 30 passes through the safety valve 70 on the piston 20 and flows to the tail cap 60. When the door is closed, the stored energy of the elastic member 30 of the floor closer 200 is released. The piston 20 is pushed 25 away from the elastic member 30 to bring the roller assembly 110 to move on the involute cam disc 82 and to slowly approach the axis of the cam disc 82, namely, to turn around the axis of the cam disc 82 for closing the door. The front end of the piston of the normal piston-type floor closer uses steel balls as a one-way oil seal. In case the door is closed forcibly, the interior parts will be 30 damaged. The front end of the piston 20 of the present invention is provided with the safety valve 70. In case the door is closed forcibly, the safety valve 70 will release pressure so as to protect the interior parts. This is beneficial to prolong the service life of the floor closer 200.

When the door is closed normally, the oil in the chamber between the safety valve 70 and the tail cap 60 will pass the oil passageway 170, the first oil hole 171, the second oil hole 172, the closing door valve 150, and the speed adjustment valve 160 and flow to the chamber at one side of the elastic member 30. The speed to 5 close the door is adjusted and controlled by the flow rate passing through the first hole 171 and the second oil hole 172. Specifically, referring to FIG. 8, when the door is closed from 90 degrees, the oil will flow in from the first oil hole 171 and flow out from the speed adjustment valve 160. The speed adjustment valve 160 is adapted to control the flow rate so as to control the speed to close the door. This moment, 10 the piston 20 blocks the second oil hole 172 and the hydraulic pressure oil passes the first hydraulic pressure oil passage. Referring to FIG. 9, when the piston 20 is further moved to block the first oil hole 171, the second oil hole 172 will not be blocked. The oil flows in from the closing door valve 150 and flows out from the second oil hole 172. The closing door valve 150 controls the flow rate, and the 15 hydraulic pressure oil flows through the second hydraulic pressure passage to control the speed to close the door. The portions of the closing door valve 150 and the speed adjustment valve 160, extending out of the main body 10, are located at the side surface of the main body 10 and perpendicular to the side wall of the main body 10, namely, perpendicular to 20 the extending direction of the accommodation cavity 12. They are disposed perpendicularly relative to the door, providing large space during adjustment and convenient operation. Referring to FIG. 1, the floor closer 200 further comprises a first outer cover 180 and a second outer cover 190. The first outer cover 180 and the second outer cover 25 190 are detachably disposed at two sides of the main body 10. Specifically, the first outer cover 180 and the second outer cover 190 are detachably disposed at the two sides of the main body 10 through fasteners, respectively. When installed, after the base assembly 130 is installed on the floor, the main body 10 is installed on the base assembly 130 and the glass door 300 is fixed to the 30 accommodation groove 16. After that, the first outer cover 180 and the second outer cover 190 are installed to the two opposing sides of the main body 10, respectively.

The first outer cover 180 and the second outer cover 190 are adapted to protect the main body 10, the piston 20, and the other parts so as to prolong the service life of the floor closer 200. Although particular embodiments of the present invention have been described 5 in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims. Throughout this specification and the claims which follow, unless the context 10 requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. The reference in this specification to any prior publication (or information derived 15 from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates. 20

Claims

1. A floor closer, comprising: a main body, the main body having an accommodation cavity and a first accommodation hole, the accommodation cavity having two open ends, the first 5 accommodation hole communicating with the accommodation cavity; a piston, the piston being accommodated in the accommodation cavity; an elastic member, the elastic member being accommodated in the accommodation cavity, one end of the elastic member being against the piston; a force adjustment assembly, the force adjustment assembly comprising an 10 adjustment nut, a bevel gear, an adjustment shaft, and a force adjustment rod, the adjustment nut, the bevel gear, and the adjustment shaft being accommodated in the accommodation cavity, one end of the adjustment nut being against another end of the elastic member opposite the piston, the bevel gear being against another end of the adjustment nut opposite the elastic member, one end of the adjustment shaft 15 being inserted through the bevel gear and the adjustment nut, one end of the force adjustment rod being inserted through the first accommodation hole to lean against the bevel gear, another end of the force adjustment rod extending out of the main body through the first accommodation hole; an end cap and a tail cap, the end cap and the tail cap being adapted to seal the 20 two open ends of the accommodation cavity respectively, one end of the piston, opposite the elastic member, being against the tail cap, another end of the adjustment shaft being against the end cap.

2. The floor closer as claimed in claim 1, further comprising a camshaft and a roller assembly, the main body further having a second accommodation hole, a 25 middle portion of the piston being formed with a first through hole, a second through hole, and a third through hole, the first through hole communicating with the second through hole, one end of the roller assembly being accommodated in the first through hole, another end of the roller assembly being accommodated in the second through hole, the camshaft being inserted through the third through hole, one end of the camshaft extending out of the main body through the second accommodation hole, a middle portion of the roller assembly being against the camshaft.

3. The floor closer as claimed in claim 2, further comprising a first bearing and a second bearing fitted on two ends of the camshaft, the first bearing and the second 5 bearing being deep groove ball bearings, the deep groove ball bearings each having an inner annular height higher than an outer annular height.

4. The floor closer as claimed in claim 2, further comprising a safety valve, the end of the piston being formed with a first piston hole, the safety valve being accommodated in the first piston hole and leaning against the tail cap. 10

5. The floor closer as claimed in claim 2, further comprising a base assembly, the base assembly comprising an installation base, a connecting shaft, and a stop cover, the installation base being installed on an external support, the installation base having a base accommodation trough, the connecting shaft being accommodated in the base accommodation trough, the stop cover being disposed on the installation 15 base to cover the connecting shaft, a middle portion of the connecting shaft being formed with a square shaft accommodation trough, the end of the camshaft, extending out of the main body, being accommodated in the square shaft accommodation trough.

6. The floor closer as claimed in claim 5, wherein the installation base is formed 20 with a plurality of first adjustment holes, a plurality of second adjustment holes, and a plurality of third adjustment holes, the plurality of first adjustment holes cooperating with a plurality of fasteners to hold against the connecting shaft for left and right adjustment of the connecting shaft, the plurality of second adjustment holes cooperating with a plurality of fasteners for up and down adjustment of the installation 25 base, the plurality of third adjustment holes cooperating with a plurality of fasteners to hold against the connecting shaft for front and rear adjustment of the connecting shaft.

7. The floor closer as claimed in claim 5, wherein the installation base and the stop cover are in a circular shape. 30

8. The floor closer as claimed in claim 1, further comprising a closing door valve and a speed adjustment valve disposed on the main body, the main body being formed with an oil passageway, a first oil hole, and a second oil hole, first ends of the closing door valve and the speed adjustment valve being located inside the main body, second ends of the closing door valve and the speed adjustment valve extending out of the main body, the oil passageway, the first oil hole, and the speed 5 adjustment valve forming a first hydraulic pressure oil passage, the oil passageway, the second oil hole, and the closing door valve forming a second hydraulic pressure oil passage.

9. The floor closer as claimed in claim 8, wherein the second ends of the closing door valve and the speed adjustment valve, extending out of the main body, are 10 perpendicular to an extending direction of the accommodation cavity.

10. The floor closer as claimed in claim 1, further comprising a first outer cover and a second outer cover, the first outer cover and the second outer cover being detachably disposed at two opposing sides of the main body.