Silent call pager

• US 3,911,416 A
• Filed: 08/05/1974
• Issued: 10/07/1975
• Est. Priority Date: 08/05/1974
• Status: Expired due to Term

• Current Assignee: Alvin Feder
• Original Assignee: Alvin Feder
• Inventors: Feder, Alvin
• Primary Examiner(s): Habecker, Thomas B.
• Assistant Examiner(s): Groody, James J.
• Application Number:
  US05/492,375
• Time in Patent Office: 428 Days
• Field of Search: 340/311,407,271 310/50,51,81,DIG.1 116/115,DIG.17 343/225
• US Class Current: 340/7.6
• CPC Class Codes: G08B 6/00 Tactile signalling systems, e.g. personal calling systems
• CPC Class Codes: H02K 7/061 using rotary unbalanced masses for generating mechanical vibrations in general B06B1/16

Abstract

A pager that produces a vibratory alerting signal when a paging signal is received. Vibrating motion is created by a motor, internal to the pager, rotating a weight. The rotating weight initially presents a small torque load to the motor, but subsequently a large vibrating motion is created because the center of gravity of the rotating weight moves further away from the axis of rotation due to centrifugal force.

Claims

1. A vibratory pager including:

a pager case;

a motor being responsive to receiving a paging signal and being mechanically coupled to said pager case;

drive shaft means attached to said motor and capable of being rotated about an axis of rotation by said motor;

weight means;

connection means for attaching said weight means to said drive shaft means, such that said weight means has a center of gravity with a first distance from the axis of rotation when said drive shaft is not being rotated, and said weight means moves, when said drive shaft means is being rotated, such that the center of gravity of said weight means is a second distance from the axis of rotation, said second distance being larger than said first distance.

2. The pager as claimed in claim 1 wherein the axis of said drive shaft means is coincident with the axis of rotation.

3. The pager as claimed in claim 2 wherein said connection means includes a pivot pin attached to said drive shaft means.

4. The pager as claimed in claim 3 wherein said pivot pin is attached substantially perpendicular to said drive shaft means.

5. The pager as claimed in claim 4 wherein the said first distance, between the center of gravity of said weight means and said axis of rotation, is approximately zero.

6. The pager as claimed in claim 5 wherein said pager case includes attachment means for mechanically coupling said pager case to a person'"'"''"'"'s body.

7. A vibratory pager including:

a case;

a motor mechanically coupled to said case;

a drive shaft attached to said motor and rotatable by said motor about an axis of rotation;

a weight attached to said drive shaft;

said motor being operative in response to receipt of a paging signal;

said drive shaft means being coincident with the axis of rotation; and

connection means for attaching said weight to said drive shaft such that said weight has a center of gravity approximately coincident with the axis of rotation of said weight, when said drive shaft is not rotated and said pager is upright, and noncoincident when said drive shaft is rotated and said pager is upright.

8. A pager as claimed in claim 7 wherein the connection means includes a pivot pin.