Patent US4852875A successfully refreshed from Google Patents.
US4852875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racquet swing training apparatus
Assignee: Individual
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Filing: 1987-12-15
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Granted: 1989-08-01
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Expires: 2007-12-15
Abstract
Abstract A swing training apparatus for use with a hand held sports implement having a head and a handle with a longitudinal axis extending between the head and handle includes a housing that is mounted to the implement at a position adjacent the head. A sleeve carried by the housing defines a bore with a bore axis generally parallel to the implement longitudinal axis. A slug is carried by the sleeve in the bore and has a metallic portion defining a first electrical contact. A spring is used to bias the slug into a position spaced away from the implement head. A second electrical contact is positioned to engage the first contact when a preset centripetal force urges the slug to travel toward the implement head when the implement is swung with sufficient force. An indicator emits an audible signal and emits the signal as the implements reaches the preset centrifugal force threshhold. Sufficient centripetal force thus moves the slug and causes it to engage the first and second contacts closing a circuit to the indicator. The apparatus can be adjusted to measure different centripeal threshholds. The performer receives audible information at the moment of peak centripeal force. Ideally, that moment should occur at impact. The apparatus works as a training device to aid the performer improve his/her timing.
Inventors
- 👤 Jim McLennan
- 👤 Richard Davis
- 👤 Donald Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:24
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/36; A63B69/3623; A63B69/3632; A63B69/3635; A63B69/38
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
193 words
A swing training apparatus for use with a hand held sports implement having a head and a handle with a longitudinal axis extending between the handle and the head, comprising: a. a support; b. means for attaching the support to the implement at a position adjacent to the head; c. the support having a bore generally parallel to the longitudinal axis of the implement when the support is attached thereto in an operating position; d. a magnetic slug shiftably mounted in the bore; e. means for biasing the slug in one direction to cause it to return to an initial rest position after the slug moves in response to force applied thereto during a swinging of the implement; f. magnetic sensor means normally spaced from the magnetic slug for producing an electrical output signal proportional to the proximity of the magnetic slug to the sensor means; and g. transducer means for generating a measured signal as the implement is swung and when the magnetic slug is moved to a position that approaches the linear magnetic sensor means, the signal changing in value depending upon the proximity of the slug to the sensor means.
Claim 2
Dependent Claim
193 words
A swing training apparatus for use with a hand held sports implement having a head and a handle with a longitudinal axis extending between the handle and the head, comprising: a. a support; b. means for attaching the support to the implement at a position adjacent to the head; c. the support having a bore generally parallel to the longitudinal axis of the implement when the support is attached thereto in an operating position; d. a magnetic slug shiftably mounted in the bore; e. means for biasing the slug in one direction to cause it to return to an initial rest position after the slug moves in response to force applied thereto during a swinging of the implement; f. magnetic sensor means normally spaced from the magnetic slug for producing an electrical output signal proportional to the proximity of the magnetic slug to the sensor means; and g. transducer means for generating a measured signal as the implement is swung and when the magnetic slug is moved to a position that approaches the linear magnetic sensor means, the signal changing in value depending upon the proximity of the slug to the sensor means.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1, wherein the slug is affixed to directly the supporting and biasing means.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1, wherein a sleeve defines said bore, the sleeve being a non-metallic tube.
Claim 5
Dependent Claim
10 words
The apparatus of claim 3, wherein the slug is magnetized.
Claim 6
Dependent Claim
15 words
The apparatus of claim 4, wherein the signal emitting means includes a Hall Effect Sensor.
Claim 7
Dependent Claim
31 words
The apparatus of claim 5, wherein the signal emitting means includes a transistor triggered in response to the travel of the magnetized slug to a position adjacent the Hall Effect Sensor.
Claim 8
Dependent Claim
14 words
The apparatus of claim 6, wherein the signal emitting means includes a piezoelectric transducer.
Claim 9
Dependent Claim
14 words
The apparatus of claim 1, wherein the signal emitting means includes a magnetic switch.
Claim 10
Dependent Claim
21 words
The apparatus of claim 1 further comprising means for adjusting the amount of force needed to activate the signal emitting means.
Claim 11
Dependent Claim
20 words
The apparatus of claim 9, wherein the adjusting means includes means for changing the position of the second electrical contact.
Claim 12
Dependent Claim
28 words
The apparatus of claim 1, wherein the generating means generates a value that is proportional to the force applied to the implement during a swinging of the implement.
Claim 13
Dependent Claim
199 words
A swing training apparatus for use with a hand held sports implement having a head and a handle with a longitudinal axis extending between the handle and the head, comprising: a. a support; b. means for attaching the support to the implement at a position adjacent to the head; c. the support having a bore generally parallel to the longitudinal axis of the implement when the support is attached thereto in an operating position; d. a magnetic slug shiftably mounted in the bore; e. means for biasing the slug in one direction to cause it to return to an initial rest position after the slug moves in response to force applied thereto during a swinging of the implement; f. magnetic responsive switch means including a switch body normally spaced from the magnetic slug for producing an electrical output signal as the magnetic slug approaches the switch body so that a signal is produced at a predetermined adjustable position prior to a contact of the magnetic slug and the switch body; g. means for generating a signal as the implement is swung and when the magnetic slug is moved to a position that approaches but before contacting the switch body.
Claim 14
Dependent Claim
199 words
A swing training apparatus for use with a hand held sports implement having a head and a handle with a longitudinal axis extending between the handle and the head, comprising: a. a support; b. means for attaching the support to the implement at a position adjacent to the head; c. the support having a bore generally parallel to the longitudinal axis of the implement when the support is attached thereto in an operating position; d. a magnetic slug shiftably mounted in the bore; e. means for biasing the slug in one direction to cause it to return to an initial rest position after the slug moves in response to force applied thereto during a swinging of the implement; f. magnetic responsive switch means including a switch body normally spaced from the magnetic slug for producing an electrical output signal as the magnetic slug approaches the switch body so that a signal is produced at a predetermined adjustable position prior to a contact of the magnetic slug and the switch body; g. means for generating a signal as the implement is swung and when the magnetic slug is moved to a position that approaches but before contacting the switch body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |