Motor and piston assembly for percussive massage device
A self-contained reciprocation mechanism is coupleable within an enclosure of a percussive massage device and is configured to receive an applicator head for stimulating a user's muscles. The self-contained reciprocation mechanism includes a spatial positioning bracket, a semi-cylindrical bracket, a piston, a motor, a crank, and a reciprocation linkage. The spatial positioning bracket is configured to receive the other interconnected components of the self-contained reciprocation mechanism and position said components relative to each other at close predetermined tolerances to assure that the interconnected components are properly positioned to provide consistent operating characteristics. The self-contained reciprocation mechanism is coupled within the enclosure using screws which extend through mounting tabs of the spatial positioning bracket.
1. A self-contained reciprocation mechanism coupleable within an enclosure of a percussive massage device and configured to receive an applicator head, the self-contained reciprocation mechanism comprising:
a spatial positioning bracket including a motor mounting portion, a downwardly open semi-cylindrical end portion, and a downwardly open partially cylindrical middle portion positioned between the motor mounting portion and the semi-cylindrical end portion, the semi-cylindrical end portion and the partially cylindrical middle portion extending along a longitudinal direction;
a semi-cylindrical bracket coupleable to the semi-cylindrical end portion of the spatial positioning bracket to define a cylindrical passageway along the longitudinal direction;
a piston slidably positioned within the cylindrical passageway, the piston having a first piston end and a second piston end, the piston constrained to move only along the longitudinal direction through the cylindrical passageway, the second piston end configured to receive the applicator head;
a motor coupled to the motor mounting portion of the spatial positioning bracket, the motor including a rotatable shaft extending below the motor mounting portion, the shaft having a central axis oriented perpendicular to the longitudinal direction;
a crank including a central bore configured to receive the shaft of the motor such that the crank is positioned below the motor mounting portion of the spatial positioning bracket, the crank further including a downwardly extending post offset from the central axis of the shaft; and
a reciprocation linkage having a first linkage end and a second linkage end, the first linkage end coupled to the post of the crank, the second linkage end coupled to the first piston end.
2. The self-contained reciprocation mechanism as defined in claim 1 , wherein:
the first linkage end includes a first linkage end upper surface and the second linkage end includes a second linkage end upper surface positioned parallel to both the first linkage end upper surface and the longitudinal direction; and
the second linkage end upper surface is offset above the first linkage end upper surface.
3. The self-contained reciprocation mechanism as defined in claim 1 , wherein:
the first linkage end includes a first linkage end receptacle configured to receive a first linkage end ball bearing coupler; and
the first linkage end ball bearing coupler is configured to receive the downwardly extending post of the crank.
4. The self-contained reciprocation mechanism as defined in claim 1 , wherein:
the second linkage end includes a second linkage end receptacle configured to receive a second linkage end ball bearing coupler; and
the first piston end includes a piston pin configured to extend through the second linkage end ball bearing coupler positioned in the second linkage end receptacle.
5. The self-contained reciprocation mechanism as defined in claim 1 , further comprising:
a cylindrical sleeve positioned within the cylindrical passageway; and
a cylindrical body positioned within the cylindrical sleeve, the cylindrical body configured to slidably receive the piston therethrough.
6. The self-contained reciprocation mechanism as defined in claim 5 , wherein:
the cylindrical passageway includes a circumferential passageway channel defined along an inner surface of the cylindrical passageway;
the cylindrical sleeve includes a radially extending sleeve rim configured to be received by the circumferential passageway channel of the cylindrical passageway to prevent movement of the cylindrical sleeve along the longitudinal direction.
7. The self-contained reciprocation mechanism as defined in claim 6 , wherein:
the cylindrical sleeve includes a circumferential sleeve channel defined along an inner surface of the cylindrical sleeve within the radially extending sleeve rim; and
the cylindrical body includes a radially extending body rim configured to be received by the circumferential sleeve channel of the cylindrical sleeve to prevent movement of the cylindrical body along the longitudinal direction.
8. The self-contained reciprocation mechanism as defined in claim 6 , wherein
the circumferential passageway channel of the cylindrical passageway is positioned nearer to the partially cylindrical middle portion of the spatial positioning bracket than to a free end of the semi-cylindrical end portion of the spatial positioning bracket.
9. The self-contained reciprocation mechanism as defined in claim 1 , wherein:
the motor mounting portion of the spatial positioning bracket includes an upper motor mounting surface parallel with the longitudinal direction; and
the spatial positioning bracket includes a plurality of mounting tabs, each of the plurality of mounting tabs including an upper mounting tab surface coplanar with the upper motor mounting surface, and a central mounting tab bore perpendicular to the longitudinal direction.
10. The self-contained reciprocation mechanism as defined in claim 9 , wherein:
each of the plurality of mounting tabs is integrally formed as part of one or more of the motor mounting portion or the partially cylindrical middle portion of the spatial positioning bracket.
11. The self-contained reciprocation mechanism as defined in claim 9 , further comprising:
a plurality of rubber grommets, each positioned through the central mounting tab bore of a respective one of the plurality of mounting tabs, the plurality of rubber grommets configured to dampen vibrations from the motor to the enclosure of the percussive massage device when the self-contained reciprocation mechanism is coupled to the enclosure.
12. A battery-powered percussive massage applicator comprising:
a main enclosure including a first enclosure portion coupleable to a second enclosure portion, the main enclosure including a cavity defined between the first and second enclosure portions, the cavity at least extending along a longitudinal direction and including a front opening;
a reciprocation unit coupleable to one of the first enclosure portion or the second enclosure portion within the cavity, the reciprocation unit comprising:
a spatial positioning bracket including a motor mounting portion, a semi-cylindrical end portion, and a middle portion positioned between the motor mounting portion and the semi-cylindrical end portion, the semi-cylindrical end portion and the middle portion extending along the longitudinal direction;
a semi-cylindrical bracket coupleable to the semi-cylindrical end portion of the spatial positioning bracket to define a cylindrical passageway along the longitudinal direction;
a piston slidably positioned within the cylindrical passageway, the piston having a first piston end and a second piston end, the piston constrained to move only along the longitudinal direction through the cylindrical passageway;
a motor coupled to the motor mounting portion of the spatial positioning bracket, the motor including a rotatable shaft extending through a central hole of the motor mounting portion, the shaft having a central axis oriented perpendicular to the longitudinal direction;
a crank coupled to the shaft of the motor, the crank including a post offset from and parallel to the central axis of the shaft and extending away from the motor mounting portion of the spatial positioning bracket; and
a reciprocation linkage having a first linkage end and a second linkage end, the first linkage end coupled to the post of the crank, the second linkage end coupled to the first piston end; and
an applicator head having a first applicator end and a second applicator end, the first applicator end of the applicator head coupled to the second piston end of the piston, the second applicator end of the applicator head exposed outside the cavity of the main enclosure.
13. The percussive massage applicator as defined in claim 12 , wherein:
at least the second piston end is configured to extend outwardly from the front opening of the cavity.
14. The percussive massage applicator as defined in claim 12 , wherein:
the spatial positioning bracket includes a plurality of mounting tabs, each of the plurality of mounting tabs including a central mounting tab bore perpendicular to the longitudinal direction; and
the central mounting tab bore of each of the plurality of mounting tabs configured to receive a screw for coupling the spatial positioning bracket to one of the first enclosure portion or the second enclosure portion of the main enclosure within the cavity.
15. The percussive massage applicator as defined in claim 14 , further comprising:
a plurality of rubber grommets, each positioned through the central mounting tab bore of a respective one of the plurality of mounting tabs, the plurality of rubber grommets configured to dampen vibrations from the motor to the main enclosure of the percussive massage applicator.
16. The percussive massage applicator as defined in claim 12 , wherein:
the first linkage end includes a first linkage end upper surface, and the second linkage end includes a second linkage end upper surface positioned parallel to both the first linkage end upper surface and the longitudinal direction; and
the second linkage end upper surface is offset above the first linkage end upper surface relative to the longitudinal direction.
17. The percussive massage applicator as defined in claim 16 , wherein:
the motor mounting portion of the spatial positioning bracket is offset from the second linkage end upper surface in a direction perpendicular to the longitudinal direction.
18. The percussive massage applicator as defined in claim 12 , further comprising:
a cylindrical sleeve positioned within the cylindrical passageway; and
a cylindrical body positioned within the cylindrical sleeve, the cylindrical body configured to slidably receive the piston therethrough.
19. The percussive massage applicator as defined in claim 18 , wherein:
the cylindrical passageway includes a circular passageway channel defined along an inner surface of the cylindrical passageway and configured to receive a radially extending sleeve rim of the cylindrical sleeve; and
the cylindrical sleeve includes a circular sleeve channel defined along an inner surface of the cylindrical sleeve and aligned with the radially extending sleeve rim of the cylindrical sleeve, the circular sleeve channel of the cylindrical sleeve configured to receive a radially extending body rim of the cylindrical body.
20. The percussive massage applicator as defined in claim 18 , wherein:
a distal end of the spatial positioning bracket opposite the motor mounting portion aligns with free ends of the cylindrical sleeve and the cylindrical body.