GB2446125A - A mechanism for raising a tennis net - Google Patents
A mechanism for raising a tennis net Download PDFInfo
- Publication number
- GB2446125A GB2446125A GB0702148A GB0702148A GB2446125A GB 2446125 A GB2446125 A GB 2446125A GB 0702148 A GB0702148 A GB 0702148A GB 0702148 A GB0702148 A GB 0702148A GB 2446125 A GB2446125 A GB 2446125A
- Authority
- GB
- United Kingdom
- Prior art keywords
- net
- pulley
- jack
- housing
- tension
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B61/00—Tennis nets or accessories for tennis or like games, e.g. volley-ball
- A63B61/02—Posts; Revolvably-mounted posts ; Straining or adjusting devices on the posts, e.g. coin- or time operated
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
A mechanism for raising a tennis net comprises a hydraulic jack 2 contained within a support housing 1. A pulley 3 is mounted on a bearing anchored to the housing. A second pulley 5 is mounted on a bearing on the ram of the hydraulic jack. A chain or steel rope is anchored to the housing, passes over pulley 5, under pulley 3 and is attached to the net cord 10 which passes over roller 6. When actuated by the lever (8, fig 2) the hydraulic ram 12 draws the chain over the pulley, tensioning the net cord. The net may be released by opening control valve (7, fig 2) which withdraws the ram.
Description
Detailed description
Referring to figure 1. Main support housing I is preferably of suitably stout proportions and of suitable material. Hydraulic jack 2 is mounted in said housing I and is of sufficient stroke length.
Pulley 3 is mounted on a suitable bearing anchored to said housing I. Chain or steel rope 4 is anchored at one end to said housing I. Pulley 5 is mounted on a suitable bearing upon ram 12 of said hydraulic jack 2. Free roller 6 is anchored at the top end of said housing I over which net cord 10 passes. The said chain or rope 4 anchored at one end to said housing 1 passes over pulley 5 and under pulley 3 at the free end of which it is attached by suitable adaptor II to net cord 10 which passes over roller 6. Thus when the hydraulic jack ram 12 upon lever 8 actuation extends carrying said pulley 5 it drags the rope or chain around said pulley 3 to provide tension on said rope 4 which is anchored to said housing I at point 13 to tension said net cord 10.
Referring to figure 2. Hydraulic control valve knob 7 when closed allows said jack 2 to pull said net rope 10 and when opened allows said rope 10 to slacken and pay out as said jack 2 retracts. Said lack actuating lever 8 is moved in an arcuate motion to provide the pumping action to raise said jack ram 12 and so tighten said net cord 10.
Referring to figure 3 shows how this post design 9 may replace the regular post set into the court surface 14 as a means of precisely setting said rope 10 tension by a pumping action instead of rotating the usual rotary handle provided. I die
Tennis pre-set net support post
Background
Tennis top cord tension is important since it influences the trajectory of a ball as it strikes the top of the net so as to introduce a potentially uncontrolled factor into the game. It also further influences the net height since the net is usually supported between two stationary posts by the tension in the cord strung between the top of them. Net cord tension is frequently arrived at arbitrarily by the tightening mechanism situated at one or other net post which frequently results in under or over-tensioning and so is likely to result in poor ball control and post foundation damage. Typically net cord tension when in play is said to be around 400 lbf. tension.
Statement of invention
lo overcome this disadvantage one such means described herewith is where a jacking device is actuated by a hand lever that embodies a hydraulic jack which in this case together employs a direction reversing pulley or alternatively an inverted jack (not shown) but without a pulley to gain the appropriate direction of net cord tension. A ball valve within the jack is pre-set so as to limit the maximum force by an internal spring loaded pressure release valve so that precise net tension results regardless of excess actuation over a minimum number of actuations. This invention replaces a regular net post that uses a typical worm gear set.
Introduction to drawings
Figure I shows a diagrammatic internal view of the post.
Figure 2 shows a second diagrammatic but external view of the post.
Figure 3 shows an installed post on a tennis court. Cbims
Claims (4)
- I. A means of precisely limiting net cord tension irrespective ofactuating input handle over-stroking.
- 2. A means of pre-adjusting net tension level by a simple oil pressure release valve so therefore independent of user skill to achieve repeatable consistency.
- 3. A pulley arrangement that multiplies jack stroke length and facilitates upright jack mounting.
- 4. The possibility of inverting a jack of greater stroke to directly apply net cord tension without additional pulley.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0702148A GB2446125A (en) | 2007-02-05 | 2007-02-05 | A mechanism for raising a tennis net |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0702148A GB2446125A (en) | 2007-02-05 | 2007-02-05 | A mechanism for raising a tennis net |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0702148D0 GB0702148D0 (en) | 2007-03-14 |
GB2446125A true GB2446125A (en) | 2008-08-06 |
Family
ID=37891292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0702148A Withdrawn GB2446125A (en) | 2007-02-05 | 2007-02-05 | A mechanism for raising a tennis net |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2446125A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1998454A (en) * | 1933-09-12 | 1935-04-23 | Samuel E Gordon | Dividing barrier for a game and means for controlling the same |
US3645370A (en) * | 1968-12-09 | 1972-02-29 | Tennis Unlimited Inc | Apparatus for raising and lowering a tennis court net |
GB2107199A (en) * | 1981-06-26 | 1983-04-27 | David Kent Trafford | Timer-operated recreational apparatus |
DE4122270A1 (en) * | 1991-07-05 | 1993-01-07 | Udo Prof Dr Ing Schueler | Automatic net adjuster e.g. for tennis court usage control - has tensioning cable fixed to one post, passing over pulleys to tensioning unit controlled by card ticket or cash |
FR2854578A1 (en) * | 2003-05-06 | 2004-11-12 | Henri Beautheac | Tennis court net lowering and raising system, has control device assembled at outside of one post, and lowering and raising post that is mounted rotating around articulation axis |
-
2007
- 2007-02-05 GB GB0702148A patent/GB2446125A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1998454A (en) * | 1933-09-12 | 1935-04-23 | Samuel E Gordon | Dividing barrier for a game and means for controlling the same |
US3645370A (en) * | 1968-12-09 | 1972-02-29 | Tennis Unlimited Inc | Apparatus for raising and lowering a tennis court net |
GB2107199A (en) * | 1981-06-26 | 1983-04-27 | David Kent Trafford | Timer-operated recreational apparatus |
DE4122270A1 (en) * | 1991-07-05 | 1993-01-07 | Udo Prof Dr Ing Schueler | Automatic net adjuster e.g. for tennis court usage control - has tensioning cable fixed to one post, passing over pulleys to tensioning unit controlled by card ticket or cash |
FR2854578A1 (en) * | 2003-05-06 | 2004-11-12 | Henri Beautheac | Tennis court net lowering and raising system, has control device assembled at outside of one post, and lowering and raising post that is mounted rotating around articulation axis |
Also Published As
Publication number | Publication date |
---|---|
GB0702148D0 (en) | 2007-03-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |