Cable slider with symmetric pieces
A device which can slide up and down on a chain or cable, can be loosened to attach to the chain or cable, but does not have any parts that come free when the part is loosened. The device includes first and second pieces, each made of structural material, the first and second pieces fitting together at concave and convex surfaces, to form an interlock forms inner surfaces with a through hole of a first shape that can slide along either a cable or a chain.
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This application claims priority from provisional application No. 61/374,553, filed Aug. 17, 2010, the entire contents of which are herewith incorporated by reference.
This application is a continuation of Ser. No. 13/209,643 filed Aug. 15, 2011, now U.S. Pat. No. 8,801,324, issued Aug. 12, 2014.
BACKGROUNDFor concert tours, industrial shows, and Broadway shows, it has become common to festoon electrical cables vertically up tensioned moving chain hoist chains and winch wire ropes.
Existing plastic chain/cable sliders are two piece units joined with multiple fasteners and requiring tools for installation or removal. This can be cumbersome since these existing chain sliders are often changed out by stagehands while they are installed high up on trusses, lifts, or ladders where loose tools and parts are a hazard.
SUMMARY OF THE INVENTIONThe new embodiment forms a chain/cable slider that has two matching halves that dovetail together with no tools or loose fasteners.
The nonstructural and of locking device 100 forms two spaced apart arms 105, 106 with a central shaft 107 through which a screw 161 is loosened and tightened in a way that locks the arms 105 106 and attaches the arms to the main structural cable piece 110. The other end of the cable piece 110 is also attached to a second carabiner 120. According to an embodiment, the cable piece 110 has a portion of the carabiner fed through openings 115 in the cable piece, so that the carabiner 120 cannot be separated from the cable piece 110 using a screw. In addition, the carabiner 120 can freely pivot in multiple different directions of freedom relative to the cable piece 110 and its outer surfaces 121, 122 can move within the inner surface 115 of the cable piece 110.
The cable piece 110 has a body which is formed of two attached and symmetrical parts 111, 112. Both of the symmetrical parts have a section of a hole therein, so that when the two symmetrical parts are brought together, it forms a through hole 130 through which a cable can slide, but within which the cable is held captive. In different embodiments, the through hole can be different sizes, for example the through hole can be sized for a ⅛ inch or 1/16 inch cable.
In addition, this “piece” forming the central portion has a connection area 310 that extends between the first tip and 300 and the second tip and 305. This connection piece is a structural piece that forms the structural connection between the first and second ends. As shown in
In addition, the portion has convex and concave curved surfaces. For example, there is a convex surface 320 and a concave curved surface 325.
Because of the structural support in the center when the two pieces are coupled together, one embodiment requires only a structural support between the holes at one end.
In operation, therefore, the two parts 111 112 can be easily separated by opening the screw 161. This screw 161 may be of a type that does not require any tools for tightening and loosening. The screw is loosened, but remains captive in its location so that no parts can fall. Moreover, loosening the screw preferably only removes the screw from a portion of the opening so that the end 100 remains attached to the body 110, but allows the two parts 111, 112 to separate from one another. In this configuration, the parts can be separated, and the cable can be placed through the through hole 130. The parts can then be reconnected, and the screw retightened. No tools are necessary for this operation, and no parts can come loose from this operation. Accordingly, for example the carabiner 120 can be attached onto a support during the operation, so that no parts can fall while the device 99 is being attached onto the cable.
This embodiment shown in
A second embodiment, shown in
As in the first embodiment, the chain portion 400 forms a central body which is connected at one end to a fixed portion 401 that connects together with the screw, and is connected at the other end to a freely pivotable portion 402 formed of a carabiner. The part 401 does not pivot, so loads attached at the part 401 cannot cause the part 401 to pivot. Loads attached at the 402 end, however, do cause that end to pivot.
As in the first embodiment,
A third embodiment, shown in
Each of these embodiments have the advantage that their center part is formed by two identical parts that are placed against one another. For example, in the embodiment of
As in the other embodiments, this device may include a shackle 1120 that is screwed in via a captive screw 1122 and where the screw remains captive when loosened. When this shackle has been removed or loosened, the parts can slide relative to one another to separate the two parts 1100, 1101, and allow access to the opening 1150. The device may also include a carabiner shown as 1130 at the other end.
In an embodiment, these devices can be machined on a CNC water jet machine, or can be injection molded.
The above has described shackles and carabiner as being placed into the respective holes in the device such as 1300, 1305. However, any connection part or any part of any type whatsoever can be placed through these holes.
Although only a few embodiments have been disclosed in detail above, other embodiments are possible and the inventors intend these to be encompassed within this specification. The specification describes specific examples to accomplish a more general goal that may be accomplished in another way. This disclosure is intended to be exemplary, and the claims are intended to cover any modification or alternative which might be predictable to a person having ordinary skill in the art. For example, other kinds and sizes of chain or cable can be used.
Also, the inventor intends that only those claims which use the words “means for” are intended to be interpreted under 35 USC 112, sixth paragraph. Moreover, no limitations from the specification are intended to be read into any claims, unless those limitations are expressly included in the claims.
Where a specific numerical value is mentioned herein, it should be considered that the value may be increased or decreased by 20%, while still staying within the teachings of the present application, unless some different range is specifically mentioned.
The previous description of the disclosed exemplary embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these exemplary embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A cable sliding device, comprising:
- first and second pieces, each made of structural material,
- said first and second pieces fitting together at an inner surface location, said inner surface location which interlocks the first and second pieces together, and where an area of the interlock forms inner surfaces forming a through hole of a first shape,
- said first and second pieces having a first end portion where said first and second pieces come together forming a first hole that extends through both of said first and second pieces,
- said first and second pieces having a second end portion, at an opposite end to said first end portion, where said first and second pieces come together and forming a second hole that extends through both of said first and second pieces,
- where said inner surface location which interlocks the first and second pieces together has multiple curved portions therein which press against each other when interlocked leaving no spaces therebetween other than the space of the inner surfaces forming the through hole.
2. The device as in claim 1, further comprising a clamp, connected through said second hole, holding said first and second pieces together.
3. The device as in claim 2, further comprising a removable connection, connected through said first hole, said removable connection pivotable relative to said first and second pieces and connected through said first hole.
4. The device as in claim 3, wherein said removable connection is a carabiner.
5. The device as in claim 1, wherein said through hole is round.
6. The device as in claim 5, wherein the through hole is round and of less than ⅛ inch in diameter and sized for holding a cable.
7. The device as in claim 1, wherein said hole is shaped to hold a chain with a cross shaped opening therein with surfaces that prevent rotation of the chain.
8. The device as in claim 1, further comprising a first fixed structural support attached to said first hole in said first and second piece, connected through said first hole in both said first and second piece, and said first fixed structural support being unmovable when connected between said first hole in said first piece and said second piece, and a movable support, connected to said second hole in said first and second piece, and pivotable relative to said second hole in said first and second piece.
9. The device as in claim 1, wherein said multiple curved portions include a convex portion and a concave portion on each of said first and second pieces.
11. A method of connecting a slider device to a support, comprising:
- connecting a first piece made of structural material, having first and second ends, and having holes at said first and second ends, to a second piece made of structural material, having first and second ends, with said first end of said second piece being adjacent said second end of said first piece, and said second piece having holes at said first and second ends,
- where said connecting matches said hole on said first end of said first piece with a hole on said second end of said second piece to form a first hole that extends through both said first and second pieces;
- loosening a connection part in said first hole, to allow movement between said first and second pieces and when loosened, allows rotation between said first and second pieces;
- inserting the support into an opening formed between said first and second pieces while said connection part is loosened;
- tightening said connection part; and
- sliding said slider device along the support with a device attached to said connection part.
12. The method as in claim 11, wherein said second connection part is a movable support, connected to said second hole in said first and second piece, and further comprising pivoting said second connection part relative to said second hole in said first and second piece.
13. The method as in claim 11, wherein said through hole is less than ⅛ inch in diameter and said support is a supporting cable that slides through said through hole.
14. The method as in claim 11, wherein said through hole is sized to receive a chain and said support is a chain that slides through said through hole.
15. The method as in claim 14, wherein said through hole includes inner surfaces which are sized to receive a chain in a way that prevents rotation of the chain.
16. A method, comprising:
- attaching at least a first mode connection to a structural device;
- allowing the structural device to slide on a chain;
- wherein the sliding of the structural device on the chain is done in a way that prevents rotation of the chain.
Type: Application
Filed: Aug 12, 2014
Publication Date: Dec 4, 2014
Applicant: PRODUCTION RESOURCE GROUP L.L.C. (New Windsor, NY)
Inventor: James Kempf (New Windsor, NY)
Application Number: 14/457,330
International Classification: H02G 1/06 (20060101); F16G 15/06 (20060101); F16G 11/00 (20060101); F16G 15/04 (20060101); H02G 3/30 (20060101); H02G 11/00 (20060101);