# Patent

## Title
Quick disconnect coupling

## Abstract

A quick disconnect coupling including a first hub, a shaft fixedly connected to the first hub, the shaft being non-round in cross-section, and a second hub having a non-round recess extending therethrough, the non-round recess being sized to closely receive the shaft such that the second hub is capable of sliding along the shaft and is prevented from rotating about the shaft, wherein rotation of the first hub results in corresponding rotation of the second hub.

## Background
CROSS-REFERENCE TO RELATED APPLICATION AND CLAIM TO PRIORITY
This application is a divisional of application Ser. No. 11/094,870, filed Mar. 31, 2005 now abandoned, which claims priority from U.S. Provisional Patent App. No. 60/558,535 filed on Apr. 1, 2004, the disclosures of which are incorporated herein by reference and to which priority is claimed.


BACKGROUND
The present application relates to coupling devices and, more particularly, to coupling devices capable of being quickly disconnected.
Coupling devices are typically used on various types of equipment to transfer power from a first rotating shaft to a second rotating shaft. It is often desirable to disconnect a coupling such that equipment embodying the coupling may be cleaned. However, often times, it may be quite time consuming to disconnect the couplings.
Accordingly, there is a need for coupling devices that may be quickly disconnected and reconnected.
SUMMARY
A first aspect of the quick disconnect coupling includes a first hub, a shaft fixedly connected to the first hub, the shaft being non-round in cross-section, and a second hub having a non-round recess extending therethrough, the non-round recess being sized to closely receive the shaft such that the second hub is capable of sliding along the shaft and is prevented from rotating about the shaft, wherein rotation of the first hub results in corresponding rotation of the second hub.
A second aspect of the quick disconnect coupling includes a male coupling member having at least two jaws thereon, a female coupling member having at least two recesses for receiving the jaws, and a spider having at least four wings extending therefrom, the spider being shaped to be received within the female coupling member such that each of the recesses includes at least two of the wings, wherein each jaw of the male coupling member is positioned between two wings of the spider when the male coupling member is engaged with the female coupling member.
A third aspect of the quick disconnect coupling includes a drive shaft, a motor, and a coupling device for transferring rotational power from the motor to the drive shaft, the coupling device including a first hub, a non-round shaft fixedly connected to the first hub, a second hub closely and slidably received over the non-round shaft, the second hub having a recess for receiving the drive shaft, and a spring for biasing the first hub away from the second hub, wherein the first hub is connected to the motor and the second hub is selectively connectable to the drive shaft.
Other aspects of the quick disconnect coupling will be apparent from the following description, the accompanying drawings, and the appended claims.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A is a front perspective view of a first aspect of the quick disconnect coupling;
FIG. 1B is a side elevational view of the quick disconnect coupling of FIG. 1A;
FIG. 2 is a front perspective view of the quick disconnect coupling of FIG. 1A embodied on a motor for use with a piece of equipment having a drive shaft;
FIG. 3 is an exploded perspective view of a second aspect of the quick disconnect coupling;
FIG. 4A is a front perspective view of the quick disconnect coupling of FIG. 3 in an engaged position; and
FIG. 4B is a front elevational view, in section, of the quick disconnect coupling of FIG. 4A.



DETAILED DESCRIPTION
As shown in FIGS. 1A and 1B, a first aspect of the quick disconnect coupling, generally designated 10, includes a male hub 12, a female hub 14, a non-round shaft 16, a spring 17 and a pin 22.
The non-round shaft 16 may be attached to or integral with (i.e., shaft 16 is connected to) the male hub 12 and may include a slot 18 extending axially along the non-round shaft 16 and through a surface of the non-round shaft 16. The non-round shaft 16 may have any shape in cross-sectional view (taken perpendicular to the axis of the shaft) other than circular, hence the designation as non-round. For example, in cross-sectional view, the non-round shaft 16 may be square, rectangular, triangular, pentagonal, hexagonal or elliptical.
The female hub 14 may include a first end 24, a second end 36 and a non-round recess 20 extending axially through the length of the female hub 14. The non-round recess 20 is non-round in shape, as described above, and has a shape corresponding to the shape of the non-round shaft 16 such that the non-round shaft 16 may be closely received within the non-round recess 20. The female hub 14 may slide relative to the male hub 12 along the non-round shaft 16 and rotation of the male hub 12 (and corresponding rotation of the non-round shaft 16) results in rotation of the female hub 14 due to the non-round shape of the shaft 16 and recess 20.
The spring 17 may be a coil spring and may be position coaxially over the non-round shaft 16 and between the male hub 12 and female hub 14 to bias the female hub 14 away from the male hub 12. The pin 22 may be inserted through an opening 21 in the first end 24 of the female hub 14 such that the pin 22 engages the slot 18 in the non-round shaft 16, thereby restricting movement of the female hub 14 relative to the male hub 12 along the shaft 16.
As shown in FIG. 2, the quick disconnect coupling 10 may be attached to a motor 26 for connecting the motor 26 to a drive shaft 34 of a piece of equipment 28. The drive shaft 34 may include an end portion 42 and may be shaped to be received within the recess 20 of the female hub 14 (i.e., non-round in shape) such that rotation of the female hub 14 results in corresponding rotation of the drive shaft 34 when the drive shaft 34 is received within the recess 20.
The motor 26 may be slideably mounted onto the piece of equipment 28 by sliding a pair of wings 32 of the piece of equipment 28 between the body of the motor 26 and flanges 30.
The male hub 12 of the coupling 10 may be fixedly attached to the shaft (not shown) of the motor 26. The female hub 14 may then be attached to the drive shaft 34 of the equipment 28 as follows: First, the female hub 14 is retracted against the bias of the spring 17 and toward the male hub 12. Then, the motor 26 may be slid onto the equipment 28 as described above (i.e., via flanges 30). When the female hub 14 is released, thereby allowing the spring 17 to bias the female hub 14 to its forward and engaged position, the drive shaft 34 of the equipment 28 is received within the recess 20 of the female hub 14 such that power from the motor 26 may be transferred to the drive shaft 34 by rotation of the male hub 12 which results in rotation of the non-round shaft 16 which results in rotation of the female hub 14 and corresponding rotation of the drive shaft 34.
The quick disconnect coupling 10 may be disconnected from the drive shaft 34 as follows: The female hub 14 may be retracted against the bias of the spring 17 into close proximity with the male hub 12 such that the drive shaft 34 is no longer received within the recess 20 and the second end 36 of the female hub 14 is cleared from an end portion 42 of the drive shaft 34. The motor 26 may then be slid off of the equipment 28.
As shown in FIGS. 3, 4A and 4B, a second aspect of the quick disconnect coupling, generally designated 50, includes a male coupling member 52, a female coupling member 54, a spider 56 and a connector such as a washer 58 and screw 60 assembly.
The male coupling member 52 may be generally cylindrical in shape and include a first end 71 and a second end 73. Three jaws 62 may be spaced equidistantly about the periphery of the second end 73 and extend axially from the male coupling member 52. Each jaw 62 may include a beveled surface 63 and be tapered to a point 65. The first end 71 may include a recess 70 having a slot 72 therein. The recess 70 may receive a first shaft (not shown) having a notch (not shown) that engages the slot 72 for preventing rotation of the first shaft relative to the male coupling member 52 such that rotation of the first shaft results in corresponding rotation of the male coupling member 52.
The female coupling member 54 may be generally cylindrical in shape and include a first end 80 and a second end 82. Three recesses 64 may be spaced equidistantly about the periphery of the first end 80 for receiving the three jaws 62 of the male coupling member 52. Each recess 64 may additionally include a secondary recess 69 for receiving the tapered point 65 of the jaw 62. As shown in FIG. 4B, the second end 82 may include a recess 84 having a slot 86 therein. The recess 84 may receive a second shaft (not shown) having a notch (not shown) that engages the slot 86 for preventing rotation of the second shaft relative to the female coupling member 54 such that rotation of the second shaft results in corresponding rotation of the female coupling member 54 and rotation of the female coupling member 54 results in corresponding rotation of the second shaft.
As best shown in FIG. 3, the spider 56 includes six wings 66 equidistantly spaced and extending radially from the center of the spider 56. The spider 56 is received within the first end 80 of the female coupling member 54 such that each recess 64 receives two wings 66 of the spider 56. The spider 56 may be made of a soft or hard polymeric material such as urethane or any other suitable rigid material.
The spider 56 may be fixedly attached to the female coupling member 54 by any suitable connector, such as a washer 58 and screw 60 assembly such that the spider 56 is fixed onto the female coupling member 54 thereby preventing the spider 56 from easily falling away from the coupling assembly 50 when the coupling assembly 50 is disconnected.
Accordingly, the male coupling member 52 may be connected to a first shaft 53 and the female coupling member 54 may be connected to a second shaft 55 and the two shafts 53, 55 may be coupled by engaging the male coupling member 52 with the female coupling member 54, as shown in FIG. 4A. The spider 56 creates a tight fit between the jaws 62 and recesses 64 and allows for the transfer of rotational power between the male and female coupling members 52, 54 even if the first and second shafts 53, 55 are not perfectly aligned. The beveled surface 63 and tapered point 65 of each jaw 62 guide the jaws 62 into engagement with the recesses 64 such that each jaw 62 is positioned between two wings 66 in the recess 64 and the tapered point 65 engages the secondary recess 69. Therefore, as the male coupling member 52 rotates due to the rotation of the first shaft 53, the female coupling member 54 and second shaft 55 rotate accordingly.
The coupling assembly 50 may be disconnected by withdrawing the jaws 62 of the male coupling member 52 from the recesses 64 of the female coupling member 54. When disconnected, the spider 56 remains connected to the female coupling member 54 by the washer 58 and screw 60 assembly, thereby simplifying the disassembly process.
Although the quick disconnect coupling is shown and described with respect to certain aspects, it is obvious that modifications will occur to those skilled in the art upon reading and understanding the specification. The quick disconnect coupling includes all such modifications and is limited only by the scope of the claims.

## Claims

1. A quick disconnect coupling comprising:
a male coupling member having at least two jaws thereon, said jaws having a beveled surface and an end which tapers to a point;
a female coupling member having at least two recesses for receiving said jaws and at least two secondary recesses for receiving the tapered end of said jaws; and
a spider having at least four wings extending therefrom, said spider being shaped to be received within said female coupling member such that each of said recesses includes at least two of said wings, wherein each jaw of said male coupling member is positioned between two wings of said spider when said male coupling member is engaged with said female coupling member.

2. The quick disconnect coupling of claim 1, wherein said secondary recesses are concave.

3. The quick disconnect coupling of claim 2, wherein said concave secondary recesses have a parabolic shape.

4. The quick disconnect coupling of claim 1, wherein the secondary recesses receive the entire tapered and beveled portion of said jaws.

5. A quick disconnect coupling comprising:
a male coupling member having at least two jaws thereon, at least one of said jaws having a beveled surface and an a tapered end;
a female coupling member having at least two recesses for receiving said jaws;
at least one secondary recess for receiving the end of said beveled and tapered jaw; and
a spider having at least four wings extending therefrom, said spider being shaped to be received within said female coupling member such that each of said recesses includes at least two of said wings, wherein each jaw of said male coupling member is positioned between two wings of said spider when said male coupling member is engaged with said female coupling member.

6. The quick disconnect coupling of claim 5 further comprising a connector for fixedly connecting said spider to said female coupling member.

7. The quick disconnect coupling of claim 6 wherein said connector is a washer and screw assembly.

8. The quick disconnect coupling of claim 5 wherein each of said jaws extends axially from said male coupling member.

9. The quick disconnect coupling of claim 5 wherein each of said jaws are spaced equidistantly about said male coupling member.

10. The quick disconnect coupling of claim 5 wherein said male coupling member is connected to a first shaft and said female coupling member is connected to a second shaft such that rotation of said first shaft is translated into corresponding rotation of said second shaft when said male coupling member is engaged with said female coupling member.

11. The quick disconnect coupling of claim 5, wherein the end of said jaw tapers to a point.

12. The quick disconnect coupling of claim 5, wherein said secondary recess is concave.

13. The quick disconnect coupling of claim 12, wherein said concave secondary recess has a parabolic shape.

14. The quick disconnect coupling of claim 12, wherein the secondary recess receives the entire tapered and beveled portion of said jaw.