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Apparatus for Repetitive Application of a Controlled Force (Patent No: 800351)

Inventor: Barker, Charles E.

Location: Calgary

Comments: N/A

Description: THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:-

1. An apparatus for repetitive application of a controlled force, which apparatus is characterized by a combination having;
(a) a vertically moving element having a weight W the said element being constrained to lineal motion,
(b) a counterweight of weight C where C is greater than W,
(c) pull up moving means operatively connecting the counterweight to the vertically moving element to tend to move the latter upwards,
(d) pull down moving means operatively connecting the counterweight to the vertically moving element to tend to move the latter downwards,
(e) means periodically to alter the effective length of one said moving means,
(f) and resilient regulating means forming an operative part of a said moving means.

2. Apparatus as described in Claim 1 in which; the pull up means is a cable leading upwards from the counterweight and around a pulley, to a point of attachment on the vertically moving element; and in which the pull down means is a cable secured to the counterweight and operatively connected to the element (e) aforesaid.

3. Apparatus as described in Claim 2 in which the means of securing the pull down cable to the counterweight is a rotatable drum constructed and arranged to wind or unwind a portion of the pull down cable around the drum, and means to lock the drum to prevent rotation thereof.

4. Apparatus as claimed in Claim 3, in which the resilient regulating means is an operative part of the pull down cable moving means.

5. Apparatus as described in Claim 1 in which the element (e) includes a rotatable cam of the vertically moving element, and means to rotate the cam.

6. Apparatus as claimed in Claim 4, in which the element (e) includes a rotatable cam of the vertically moving element, and means to rotate the cam.

7. Apparatus as described in Claim 1, in which the element (e) includes a rotatable cam of the vertically moving element, and means to rotate the cam, a lever pivoted to the vertically moving element, the lever being adapted to cooperate with the cam so that rotation of the cam shall cause the lever to oscillate about the pivot thereof, and in which an end of the pull down cable is' attached to an end of the lever remote from the cam, so that rotation of the cam causes periodic alteration of the effective length of the pull up means.

8. Apparatus as described in Claim 6 in which the element (e) further includes; a lever pivoted to the vertically moving element, the lever being adapted to cooperate with the carn so that rotation of the cam shall cause the lever to oscillate about the pivot thereof, and in which an end of the pull down cable is attached to an end of the lever remote from the cam, so that rotation of the cam causes periodic alteration of the effective length of the pull up means.

9. Apparatus as described in Claim 8 further characterized in that the vertically moving element includes a rotating shaft adapted for attachment of a tool thereto, together with a speed reduction train constructed and arranged so that rotation of the shaft aforesaid shall rotate the cam at a lower speed than that of the shaft.

10. Apparatus as described in Claim 9, wherein the reduction train is such as to rotate the cam at a speed between about six and about eighty revolutions per minute.

11. Apparatus as described in Claim 9, wherein the resilient regulating means is capable of lineal extension and has a force constant of from about three to about fifteen pounds per inch.

12. Apparatus as described in Claim 10, wherein the resilient regulating means is capable of lineal extension and has a force constant of from about three to about fifteen pounds per inch.

13. Apparatus as described in Claim 7, wherein the vertically moving element is adapted for attachment of a common hand power drill thereto, and in which the means to rotate the cam is a speed reduction train activated by rotation of a shaft of the power drill.

14. Apparatus as described in Claim 8, wherein the vertically moving element is adapted for attachment of a common hand power drill thereto, and in which the means to rotate the cam is a speed reduction train activated by rotation of a shaft of the power drill.

15. Apparatus as described in Claim 9, wherein the vertically moving element is adapted for attachment of a common hand power drill thereto, and in which the means to rotate the cam is a rotating shaft of the power drill.

16. Apparatus as described in Claim 12, wherein the vertically moving element is adapted for attachment of a common hand power drill thereto, and in which the means to rotate the cam is a rotating shaft of the power drill.

17. Apparatus as described in Claim 9, wherein the speed reduction train includes; a pair of swingingly mounted face wheels, spring means to urge the face wheels in engagement with faces of a friction disc, and to urge one face wheel in engagement with a driving friction collar of the power drill, and wherein the friction disc is slidably secured to a shaft, constructed and arranged so that drive is secured throughout a range of slidable motion of the friction disc as aforesaid.

18. Apparatus as claimed in Claim 17, wherein the spring urging means is adjustable, and is adapted to vary the force with which the face wheels are urged in engagement with the friction disc and the collar.

19. Apparatus as claimed in Claim 16, wherein the speed reduction train includes; a pair of swingingly mounted face wheels, spring means to urge the face wheels in engagement with faces of a friction disc, and to urge one face wheel in engagement with a driving friction collar of the power drill, and wherein the friction disc is slidably secured to a shaft, constructed and arranged so that drive is secured throughout a range of slidab1e motion of the friction disc as aforesaid.

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