Sturdy, Compact, Collapsible Camping Chair with a Central Tube Connector
A collapsible chair includes upper tubes, leg tubes, a tube connector and a seat back. The connector has four tubes bent in U shapes. Two bent tubes are welded to each other at the bottoms of the U shapes, and another two bent tubes are inverted and welded to each other at the tops of the inverted U shapes. The arms of the four U shapes are welded to each other. Upper holes are formed by ends of the first bent tubes, and lower holes are formed by ends of the second bent tubes. Lower ends of the upper tubes are inserted into the upper holes, and upper ends of the leg tubes are inserted into the lower holes. Upper ends of the upper tubes fit into tube receptacles in the seat back. The two back upper tubes are bent and are longer than the two straight front upper tubes.
This application is based on and hereby claims the benefit under 35 U.S.C. §119 from Korean Patent Application No. 2020140008443, filed on Nov. 18, 2014, in the Republic of Korea, the subject matter of which is incorporated herein by reference. This application is a continuation-in-part of Korean Application No. 2020140008443. In addition, this application is a continuation-in-part of, and claims priority under 35 U.S.C. §120 from, nonprovisional U.S. patent application Ser. No. 29/507,311 entitled “Collapsible Chair with a Central Hub of Crossed Poles,” filed on Oct. 27, 2014, the subject matter of which is incorporated herein by reference.
TECHNICAL FIELDThe described embodiments relate to chairs, and more particularly to portable, collapsible chairs that are suitable for camping, fishing, outdoor concerts and sporting events.
BACKGROUNDPortable chairs are convenient during outdoor activities at which seating is otherwise unavailable. Folding chairs that are commonly used in the home to save space are not sufficiently portable for most outdoor activities, such as camping, hiking, fishing, outdoor concerts and sporting events. A portable chair for outdoor activities should be light weight and compact. For example, a chair used for hiking or camping should advantageously fit into a back pack and not weigh down the hiker. The typical tube-and-canvas folding chairs used at field-side sporting events are simply too large and heavy to take along on a hike. A smaller and lighter folding chair would also be more convenient even at events on a field that is a short distance from the trunk of the user's car.
A collapsible camping chair is sought that is light-weight and compact but nevertheless sturdy and durable.
SUMMARYA sturdy, compact collapsible chair includes upper tubes, leg tubes, a central tube connector and a fabric seat back. All of the tubes are hollow and metal. The tube connector has two first short tubes and two second short tubes bent in U shapes. The first tubes are welded to each other at the bottoms of the U shapes, and the second tubes are inverted and welded to each other at the tops of the inverted U shapes. The arms of the U shapes of the first tubes are welded to arms of the U shapes of the second tubes at four locations. Upper holes are formed by the ends of the first tubes, and lower holes are formed by the ends of the second tubes. The upper tubes are formed from detachable sections. Each of the back upper tubes has an upper section, a middle section and a lower section. Each front upper tube has an upper section and a lower section. No part of the upper tubes other than the upper and lower ends contacts any part of the chair.
The lower end of each upper tube is inserted into one of the upper holes in the first bent tubes, and the upper end of each of the leg tubes is inserted into one of the lower holes in the second bent tubes. Each of the lower ends of the upper tubes has a circular cross section that is dimensioned to fit snugly into the circular circumference of a corresponding upper hole. Upper ends of the upper tubes fit into tube receptacles in the seat back. No part of the upper tubes other than the upper and lower ends contacts any part of the collapsible chair. The two back upper tubes are longer than the two front upper tubes. The lower section of each of the two back upper tubes is curved, whereas both sections of each front upper tube are straight.
A method of manufacturing the sturdy, collapsible chair includes forming tubes, a central tube connector and a seat back and then placing the tubes, connector and seat back in a bag that is less than one foot long. A plurality of upper tubes are formed in detachable sections. Each back upper tube has an upper section, a middle section and a lower section. The upper and middle sections are straight, whereas the lower section is bent. Each front upper tube has a straight upper section and a straight lower section. The upper tubes have lower ends and seat ends. A plurality of leg tubes are formed with upper ends and ground ends. The lower ends of the upper tubes and the upper ends of the leg tubes have outer diameters that are dimensioned to fit snugly into the inner diameters of the regular tube dimensions.
The central tube connector is formed by bending first short tubes and second short tubes into U shapes. The two first bent tubes are welded to each other at the bottoms of the U shapes such that four upper holes with circular circumferences are disposed at ends of the first tubes. The circular cross sections of the lower ends of the upper tubes are dimensioned to fit snugly into the circular circumferences of the upper holes. The two second bent tubes are welded to each other at the bottoms of the U shapes and then inverted such that four lower holes with circular circumferences are formed at the ends of the second bent tubes. The upper ends of the leg tubes are dimensioned to fit snugly into the lower holes of the second short bent tubes. The arms of the U shapes of the first short tubes are welded to the arms of the U shapes of the inverted second short tubes to form the central tube connector with only six welds.
An elastic cord is pulled through each of the tubes. An elastic cord is passed from each front upper tube, through an upper hole, through a first bent tube, out another upper hole and into the other front upper tube. An elastic cord also passes from each back upper tube, through an upper hole, through the other first bent tube, out another upper hole and into the other back upper tube. Similarly, an elastic cord passes from each front leg tube, through a lower hole, through a second bent tube, out another lower hole and into a back leg tube. The seat back is made with four tube receptacles disposed at locations on the seat back so as to fit over the seat ends of the upper tubes.
Other embodiments and advantages are described in the detailed description below. This summary does not purport to define the invention. The invention is defined by the claims.
The accompanying drawings, where like numerals indicate like components, illustrate embodiments of the invention.
Reference will now be made in detail to some embodiments of the invention, examples of which are illustrated in the accompanying drawings. In the description and claims below, terms such as “upper”, “top”, “up”, “down”, “lower”, “bottom”, “over” and “under” are used herein to describe relative orientations between different parts of the structure being described, and it is to be understood that the overall structure being described can actually be oriented in any way in three-dimensional space.
The leg tubes 35-38, the sections of the upper tubes 31-34, the first bent tubes 41-42, and second bent tubes 43-44 all have the same diameter. In one embodiment, the tubes have an outer diameter of one half inch. One end of each of the leg tubes 35-38 and each section of the upper tubes 31-34 has a smaller outside diameter that fits inside the inner diameter of the regular tube dimensions. For example, the lower end of the lower section of the upper tube 31 has a one-inch length with a three-eighths-inch outer diameter that fits inside the inner diameter of the first bent tube 41.
The U shapes of the second bent tubes 43-44 are inverted to open downwards. The bottoms of the two inverted U shapes of the two second tubes 43-44 are welded to each other such that four lower holes with circular circumferences are formed at the ends of the second tubes 43-44. The angle between the planes of the U shapes of the welded second tubes 43-44 is also about ninety degrees.
Returning to
The ends of the elastic cords are attached to the inside of plugs that fit into the seat ends of the upper tubes 31-34 or into the bottom ends of the leg tubes 35-38. One elastic cord passes from an end plug at the seat end of front upper tube 31, through first bent tube 41 and through front upper tube 32 to an end plug at the seat end. A second elastic cord passes from an end plug at the seat end of back upper tube 33, through first bent tube 42 and through back upper tube 34 to an end plug at the seat end. A third elastic cord passes from a ground plug at the bottom end of front leg tube 35, through second bent tube 43 and through back leg tube 38 to a ground plug at the bottom end. Finally, a fourth elastic cord passes from a ground plug at the bottom end of front leg tube 36, through second bent tube 44 and through back leg tube 37 to a ground plug at the bottom end. Thus, there are four elastic cords that each pass through the means 41-44 for forming the upper and lower holes. For example, portions of an elastic cord 69 can be seen in
In step 76, the leg tubes 35-38 are also formed from hollow metal tubes with the same diameter as the upper tubes 31-34. Each leg tube has only a single section. The leg tubes 35-38 have upper ends and lower ground ends. At the upper ends of the leg tubes 35-38 there is an upper portion that has a smaller outer diameter than the rest of the leg tubes.
In step 77, the first short tubes 41-42 and the second short tubes 43-44 are bent into U shapes. The arms of the U shapes open at an angle of somewhat less than ninety degrees, such as eighty-five degrees. The upper holes 45-46 have circular circumferences and are disposed at the ends of the first tube 41, and the upper holes 47-48 have circular circumferences and are disposed at the ends of the first tube 42. The circular cross sections of the lower ends of the upper tubes 31-34 are dimensioned to fit snugly into the circular circumferences of the upper holes 45-48. Lower holes with circular circumferences are disposed at the ends of the second tubes 43-44. The circular cross sections of the upper ends of the leg tubes 35-38 are dimensioned to fit snugly into the circular circumferences of the lower holes.
In step 78, the two first short tubes 41-42 are welded to each other at location 49 at the bottoms of the U shapes such that the upper holes 45-48 face upwards. The angle between the plane of the U shape of first tube 41 and the U shape of first tube 42 is about ninety degrees.
In step 79, the two second short tubes 43-44 are welded to each other at the location 50 at the bottoms of the U shapes. The two welded second tubes 43-44 are then inverted upside down such that the four lower holes at the ends of the second tubes face downwards.
In step 80, the four arms of the two U shapes of the first tubes 41-42 are welded to the four arms of the U shapes of the two inverted second tubes 43-44. Thus, the first tubes 41-42 are welded to the second tubes 43-44 at only the four locations 51-54.
In step 81, the seat back 40 is made with the four tube receptacles 65-68 disposed at the corners of the approximately rectangular seat back so as to fit over the seat ends of the upper tubes 31-34. The seat back 40 is made by stitching together various pieces of fabric or plastic. The tube receptacles 65-68 can be sewn as pockets into the seat back or they can be molded plastic cylinders that are glued or stitched to the corners of the seat back 40.
In step 82, an elastic cord is pulled through each front pair and back pair of upper tubes and each front and back pair of leg tubes. The two elastic cords that pass through the front pair and the back pair of upper tubes also pass through the first short bent tubes 41-42. The two elastic cords that pass through each pair of front and back leg tubes also pass through the second short bent tubes 43-44. For example, the elastic cord 69 attaches to an end plug 84 at the seat end of front upper tube 31 and is pulled through the tube 31, into upper hole 45, through the first short tube 41, out of upper hole 46, into the front upper tube 32 and attaches to an end plug at the seat end of tube 32. A second elastic cord attaches to an end plug 85 at the seat end 71 of back upper tube 33 and is pulled through the sections of tube 33, into upper hole 47, through first short bent tube 42, out upper hole 48, through the sections of back upper tube 34 and attaches to an end plug at the seat end of tube 34. Similarly, a third elastic cord that attaches to a ground plug of leg tube 35 is pulled through tube 35, into a lower hole, through second short bent tube 43, out another lower hole, through back leg tube 38 and attaches to a ground plug at the bottom end of tube 38. Finally, a fourth elastic cord passes from front leg tube 36, through second tube 44 and through back leg tube 37.
In step 83, the upper tubes 31-34, the leg tubes 35-38, the first tubes 41-42, the second tubes 43-44 and the seat back 40 are placed in a bag that is less than one foot long. All of the tube sections of the upper tubes are first detached from one another, and the tubes are detached from central tube connector 39. The tubes are then oriented relatively parallel to one another, as shown in
To assemble the collapsible chair 30, the user removes the tubes and the seat back 40 from the bag and unwraps the seat back from around the tubes. The user then aligns the tube sections with each other and with the upper and lower holes. The elastic cords tend to pull the tube sections into one another and the upper tubes into the upper holes in the first bent tubes. The elastic cords also pull the leg tubes into the lower holes in the second bent tubes. The back upper tubes 33-34 are formed when the upper sections are detachably connected to the middle sections, and the middle sections are detachably connected to the lower sections. The front upper tubes 31-32 are formed when the upper sections are detachably connected to the lower sections. To assemble the collapsible chair 30, the lower ends of the upper tubes 31-34 are detachably connected to the first tubes 41-42 by being inserted into the upper holes 45-48, and the upper ends of the leg tubes 35-38 are detachably connected to the second tubes 43-44 by being inserted into the lower holes.
Although certain specific exemplary embodiments are described above in order to illustrate the invention, the invention is not limited to the specific embodiments. Accordingly, various modifications, adaptations, and combinations of various features of the described embodiments can be practiced without departing from the scope of the invention as set forth in the claims.
Claims
1. A collapsible chair comprising:
- upper tubes with lower ends and seat ends, wherein the lower ends have circular cross sections;
- leg tubes with upper ends;
- a seat back with tube receptacles;
- two first short tubes that are bent in U shapes and that are welded to each other at the bottoms of the U shapes, wherein four upper holes with circular circumferences are formed at ends of the first tubes; and
- two second short tubes that are bent in inverted U shapes and that are welded to each other at the tops of the inverted U shapes, wherein four lower holes with circular circumferences are formed at ends of the second tubes, wherein the first tubes have arms of the U shapes that are welded to arms of the U shapes of the second tubes, wherein the lower ends of the upper tubes are detachably connected to the first tubes by being inserted into the upper holes, wherein the upper ends of the leg tubes are detachably connected to the second tubes by being inserted into the lower holes, wherein the seat ends of the upper tubes are detachably connected to the tube receptacles, and wherein no part of the upper tubes other than the lower ends and the seat ends contacts any part of the collapsible chair.
2. The collapsible chair of claim 1, wherein the upper tubes consist of two tubes of a first length and two tubes of a second length, and wherein the first length is longer than the second length.
3. The collapsible chair of claim 2, wherein each of the two tubes of the first length is bent, and wherein neither of the two tubes of the second length is bent.
4. The collapsible chair of claim 2, wherein each of the upper tubes of the first length has a lower section, a middle section and an upper section, wherein the lower end of each upper tube of the first length is disposed on the lower section of the upper tube, wherein each lower section is curved, and wherein each middle section and each upper section is straight.
5. The collapsible chair of claim 1, wherein the first tubes are welded to the second tubes at only four locations.
6. The collapsible chair of claim 1, wherein each of the upper tubes is comprised of detachable sections.
7. The collapsible chair of claim 1, wherein the circular cross section of each of the lower ends is dimensioned to fit snugly into the circular circumference of a corresponding upper hole.
8. The collapsible chair of claim 1, wherein the upper tubes consist of four tubes, and wherein the seat ends fit into the tube receptacles at four corners of the seat back.
9. The collapsible chair of claim 1, wherein the seat back is made of fabric.
10. The collapsible chair of claim 1, further comprising:
- an elastic cord that passes through one of the first short bent tubes and into one of the upper tubes.
11. A collapsible chair comprising:
- upper tubes with lower ends and seat ends, wherein the lower ends have circular cross sections;
- leg tubes with upper ends;
- a seat back with tube receptacles;
- a central tube connector with two first tubes bent in U shapes and two second tubes bent in inverted U shapes, wherein the first tubes are welded to each other at the bottoms of the U shapes, wherein the second tubes are welded to each other at the tops of the inverted U shapes, wherein four upper holes are formed at ends of the first tubes, wherein four lower holes are formed at ends of the second tubes, wherein arms of the U shapes of the first tubes are welded to arms of the inverted U shapes of the second tubes, wherein the lower ends of the upper tubes are detachably connected to the first tubes by being inserted into the upper holes, wherein the upper ends of the leg tubes are detachably connected to the second tubes by being inserted into the lower holes, wherein the seat ends of the upper tubes are detachably connected to the tube receptacles, and wherein no part of the upper tubes other than the lower ends and the seat ends contacts any part of the collapsible chair.
12. The collapsible chair of claim 11, further comprising:
- an elastic cord that passes through one of the upper tubes and into one of the upper holes.
13. The collapsible chair of claim 11, wherein the four arms of the U shapes of the first tubes are welded to the four arms of the inverted U shapes of the second tubes at four locations.
14. The collapsible chair of claim 11, wherein the upper tubes include two tubes of a first length and two tubes of a second length, and wherein the first length is longer than the second length.
15. The collapsible chair of claim 14, wherein each of the two tubes of the first length is bent, and wherein neither of the two tubes of the second length is bent.
16. The collapsible chair of claim 14, wherein each of the upper tubes of the first length has a lower section, a middle section and an upper section, wherein the lower end of each upper tube of the first length is disposed on the lower section of the upper tube, wherein each lower section is bent, and wherein each middle section and each upper section is not bent.
17. A method comprising:
- forming upper tubes with lower ends and seat ends, wherein the upper tubes are formed in sections, and wherein the lower ends have circular cross sections;
- forming leg tubes with upper ends;
- bending first tubes and second tubes into U shapes;
- welding two first tubes to each other at the bottoms of the U shapes, wherein upper holes with circular circumferences are disposed at ends of the first tubes, and wherein the circular cross sections of the lower ends are dimensioned to fit snugly into the circular circumferences of the upper holes;
- welding two second tubes to each other at the bottoms of the U shapes and inverting the two welded second tubes such that four lower holes with circular circumferences are formed at ends of the second tubes, and wherein the upper ends of the leg tubes are dimensioned to fit snugly into the lower holes;
- welding arms of the U shapes of the first tubes to arms of the U shapes of the inverted second tubes; and
- making a seat back with tube receptacles disposed at locations on the seat back so as to fit over the seat ends of the upper tubes.
18. The method of claim 17, further comprising:
- pulling an elastic cord through one of the first tubes and into one of the upper tubes.
19. The method of claim 17, wherein the first tubes are welded to the second tubes at only four locations.
20. The method of claim 17, further comprising:
- placing the upper tubes, the leg tubes, the first tubes, the second tubes and the seat back in a bag that is less than one foot long.
21-24. (canceled)
Type: Application
Filed: Jan 26, 2015
Publication Date: Apr 28, 2016
Inventor: Youn Jae Lee (Pleasanton, CA)
Application Number: 14/605,318