US1380702A - Positive-stroke pump mechanism - Google Patents

Description

P. CALLARD. POSITIVE STROKE PUMP MECHANISIVL.

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POSITIVE STROKE PUMP MECHANISM.

APPLICATION FILED APR- I8, 1918.

Patented June 7, 1921.

3 SHEETSSHEET 3.

fave/7Z5: 05677 aa/zzarcz WW fuzz/Z655: fiziw ton rod 1 actuatedby a reciprocating rack UNITED STATES ROBERT P. GALLARD, 015 FORT WAYNE, INDIANA..-

POSITIVE-STROKE PUMP MECHANISM.

Specification of Letters Patent.

Patented June 7, 1921.

Application filed April 18, 1918. Serial No. 229,343.

T 0 all 10 ham it may concern:

Be it known that I, ROBERT P. OALLARD, a citizen of the United States, residing at Fort Wayne, in the county of Allen and State of Indiana, have invented certain new and useful Improvements in Positive-Stroke Pump Mechanism, of which the following is a specification.

This invention relates to a mechanism for insuring the full stroke of a pump, or like mechanism, and for preventing the reversal of a predetermined stroke without giving visible notice thereof, so that it will be clearly evident to a customer that he is being short-measured.

The invention consists in the novel construction, combination, and arrangement of the parts. I

In the accompanying drawings Figure 1 is a view in elevation, with some parts shown in section, of a pump mechanism embodying theprinciple of this invention.

Fig. 2 is a sectional detail of the operating mechanism.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2. r

Fig. 4 is a view of the indicating mechanism.

Fig. 5 is another view of the indicating mechanism.

Fig. 6 is a sectional view taken on line 6-6 of Fig. 4; and

Fig. 7 is a sectional view taken on line 77 of Fig. 1.

In operating many well known types of dispensing apparatus, as pumps, and the like, it would be an easy matter for a dishonest person to short-measure a customer by simply reversing the mechanism before the end of the stroke. The present invention provides meansfor preventing such reversal of the mechanism until it has been positively actuated for thefull predetermined stroke forwhich it has been set.

This mechanism is described as applied to a single-acting piston pump having a pis- 2. It might also be applied to a double-acting pump of any well-known type, it being deemed unnecessary to illustrate any specific pumpstructure other than that shown. The rack is commonly actuated by a. pinion 3 mounted on a driving shaft 4:, and manually operated by means of a. crank 5.

Associated with the rack is a stroke-setting mechanism comprising a rod 6 seated at its lower end in the upper casing or manifold 7 of the pump mechanism and adapted to be raised and lowered a certain distance, or independently rotated with respect to the rack. The lower part of this rod has a circular section 8 above which it IS formed with a square section 9. At the lower end of the rack 2 is a projecting arm 10 with a fiat end which extends close to the rod 6, the squared surfaces thereof permitting an adjustment of the rod to four diiferent positions, and the circular portion 8 of the rod permitting its rotation to any one of the four positions when this arm 10 is opposite the rounded portion 8. The rod carries a collar 11 which is engaged by the arm 10 in the lowermost position of the rack, and it is only when it is in this position that the rod can be rotated. Carried by the rod are stops 12, 13 and let for limiting the strokes of the pump rack, and each of these stops carries an adjusting screw 15 with a lock nut 16 for accurately setting it to en age the arm 10. at a predetermined point. urrounding the rod at its lower end is a sleeve 17 having an internal keyway l8 and an external gear 19, and resting upon the manifold 7. The internal keyway is engaged by a key 20'carried by the rod, thus permitting the longitudinal movement of the rod without disengagement from the sleeve 17. Meshing with the gear 19 of this sleeve is a gear segment 21, (see Fig. 3), carried by a pivoted member 22 from which extends a pointer- 23 movable over a graduated scale 24 on top of the pump manifold 7 so that by the rotation of this setting member 21, as indicated by the pointer 23, the rod 6 can be rotated when the pump rack is in its lowermost position to set any one of the predetermining stops so that the desired quantity will be pumped upon the actuation of the pump rack.

At the upper end of the rod 6 is a collar .25 which also carries an adjustable limit and quantity stop 26 which is set by the rotation of the rod. The upper end of the rod is also slidably mounted in a casing part 27, the end of the rod extending through the casing and carrying a gear 28, held in place by a nut 29. \Vithin the casing a member 30 is attached to the rod between a shoulder 31 thereof, and a collar 32 secured to the rod. A tubular projection 33 extends from one side of the member 30 in which is mounted a stop member 34 having an outer angular surface and pressed outwardly therefrom by a spring 35. Attached to the casing 27 is a plate 36 having notches 37 and 38 which are engaged by the spring-pressed member 34, the notches being so arranged that this stop member 34 engages the lowermost one when the rod 6 is in its lowermost position and engages the upper notch when the rod is raised, thus limiting the rod to two positions and yieldingly holding it in either one of them until disengaged by the contact of the arm 10 carried by the rack 2. Projecting from another side of this member 30 is a T- headed projection 39, the extensions of the head lying parallel with and adjacent the rack 2.

' In the casing 27 at the back of the rack 2, that is, opposite its toothed portion, and between it and the rod 6 are guides 40 and 41, between which is a bearing plate 42 with an opening 43, through which the T-headed portion 39 of the member 30 extends, and with oppositely inclined surfaces 44 and 45. Between these surfaces and the rack bearing rollers 46 and 47 are inserted, the surfaces being so inclined that the upper roller 47 acts as a roller clutch for the rack in its downward movement, and the lower roller 46 acts as a clutch in the upward movement of the rack, each of the rollers being provided with a spring 48 which tends to hold it in the proper direction for this action. The T-headed projection 39 is so proportioned that the extremities thereof are adapted to engage one or the other, but not both of the rollers 46 and 47 for holding them out of clutching engagement, depending upon the direction of movement of the rack 2. That is, when the rack has been moved to its lowermost position so that the arm 10 engages the collar 11 and moves the rod 6 downwardly, the projection 39 will press the lowermost roller 46 out of engaging "position so that the rack can then be moved in the upward direction, and also when the rack has been moved upwardly to engage any one of the stops carried by the rod 6, the rod will be raised to its upper position moving the projection 39 out. of engagement with the lower roller 46, but into engagement with the roller 47, thereby holding it out of clutching position so that the rack may be moved downwardly. This insures the full stroke of the pump rack in either direction before it can be reversed in its direction of movement.

Above the casing 27 is a plate 49 in which is an opening 50, and through this opening a number of quantity designations corresponding to the stops on the rod 6 may be visible. These designations are carried on a roller 51 mounted in a bracket 52, the roller having a beveled gear 53 which meshes with a corresponding gear 54 which has also a spur toothed section 55 which meshes with the gear 28 carried at the upper end of the rod 6, the toothed section 55 being of suiticient length to permit the full movement of the rod without the disengagement of gear 28. It will be seen therefore that the rotation of the rod 6 by means of the setting member 22 will cause a corresponding movement of the roller 51,. the indication of pivot of this member 56 which tends to press the plate portion 57 thereof over the opening 50 as soon as the rack 2 is raised from its lowermost position. The outer face of the plate 49 may be provided with a direction or instruction plate 62 adjacent the opening 50 which will inform the customer of the operation of the device. The direction given on this plate in Fig. 1 is Full measure when open. This will inform the customer that as long as the opening 50 is closed from the inside by the plate 57 the pump rack has not been operated the full length of the stroke for which the predetermining mechanism has been set. The construction described app-lies to a singleacting pump in which the rack must be raised and then lowered to pump the required quantity, thus requiring only that the plate 57 shall uncover the designating roller 51 only for one position, namely, the lowermost of the rack. If a double-acting pump is used a second stop is provided for moving the member 56 to uncover the opening 50 when the rack is at the upper end of its stroke. In either case, as soon as the full quantity has been discharged by the full stroke of the rack, the opening 50 will be immediately uncovered, thereupon disclosing the amount actually pumped. It may happen that it is necessary to stop the pump at some time before the end of a stroke, as for example, when discharging liquid into a tank of limited capacity, such as the tank of an automobile. If the tank becomes full before the end of a strokeof the pump, the

pump cannot be reversed, and to continue the stroke of the pump in the same direction would be to waste the liquid from the remainder of the stroke, or it might be the means of short-measuring the next customer that amount of that stroke which has previously been given to the preceding customer. Means is therefore provided for permitting the reversal of the pump rack before the end of the stroke by engaging the clutching roller which would prevent its reversal, and at the same time providing an indicating means which is visible through the opening 50 to show that a short measure has been given. Secured to the operating shaft 4, (see Fig. 3), is a gear 63, meshing with which is an idler 64 for communicating movement to a gear loosely mounted on the reduced portion of a shaft 66 rotatable in the casing 27 on a center in line with the opening 43 of the bearing plate 42. Secured to the outer end of this shaft is a lever 67, and between it and the gear 65 is a spring 68 which tends to press the gear against the shoulder formed by the reduced portion, thereby making a frictional engagement between the gear 65 and the shaft 66. Keyed to the shaft 66, within the casing 27, are arms 69 which extend around the sides of the member 30 and through the opening 43 adjacent the projection 39, and the extremity of each of these arms is formed with a T-head 7 O for engaging the clutching rollers 46 and'47 in the same manner that they are enga ed by the extremities of the projection 39. he lever 67 engages a projection 71 of a cover plate 72 and holds it below the opening 50 of plate 49 against the tension of spring 73. This cover plate 72 is directly behind the plate 49 and in front of the cover plate 57, so that it in no way interferes with the operation of the member 56, and the plate 72 carries some designation, such as the Words Short measure, or the like, which will indicate to the customer that a short measure has been given whenever this plate 72 appears in the opening 50. In rotating the operating crank 5 the gear 63 attached to the operating shaft 4 causes the arms 69 to be moved upwardly or downwardly from a central'position, depending upon the direction of rotation of the operating crank. As the member 30 is shifted with the rod 6 at the ends of the stroke of the rack it might happen that in the last quarter of an inch of the travel of the rack it will be locked by one of the rollers 46 and 47 due to the shifting movement of the T-projection 39 were it not for the fact that the arms 69 do not actually move in the reverse direction until the direction of rotation of the crank 5 is reversed. This is due to the fact that the locking member 34-must be moved from one notch 37 to the, other notch 38 in changing the engagement of the T- shaped projection 39 from the lower roller 46 to the upper roller 47. It is seen therefore that 'in this movement of the rod 6 from one position to the other the arms 69 are not actually shifted to the position assumed by the projection 39 until the direction of the operatin crank is reversed. This prevents a possib e clutching interference in the last quarter of an inch or so of the travel of the rack. In order, however, to reverse the direction of rotation of the operating crank 5 at any point, for the purpose above mentioned, the lever 67 is raised from its engagement, with the projection 71 which causes a corresponding movement of the arms 69 bringing the projection 70 thereof in engagement with the upper clutch roller 47 and permitting the reverse or downward movement of the rack 2. The cover plate 72 is thereupon released and is drawn by the spring 73 over the opening 50.

It will be observed that there may be a slight movement of the shaft 66 upon which the arms 69 are mounted due to the reversal in direction of rotation of the operating crank 5 and that this will cause a corresponding movement of the lever arm 67. When the rack is moved in the downward direction the arms 69 are moved against the uppermost clutch roller 47, and this would cause the lever 67 to be raised to a slight extent. The upper edge of the plate 72, however, is located enough below the lower edge of the opening 50 so that the plate will not be moved over any portion of the opening until the lever 67 is raised manually from engagement with the projection 71.

When the stops on the rod 6 are once adjusted and set for limiting the upper travel of the rack, there is no further necessity for adjustment thereof and both the rod and the rack ma be inclosed by means of a casing 74 whic has a hinge 75 at one side and fastening devices 76 at the other side for holding the case together, a support 77 being provided for the lower end thereof which rests upon the sleeve 17 partially inclosing the lower end of the rod. In operation the rack is normally at the bottom of its stroke against the collar 11, as

shown in Fig. 1, and in this position the rod 6 may be set for limiting the stroke of the rack, as desired, by rotating the setting member 22 to any desired position, as indicated by the pointer 23. This will cause the indicating roller 51 to be correspondingly rotated, and the designation of the amount to be pumped will be visible through the opening 50. In this position the T-shaped member 39 will press the clutch roller 46 out of engaging position against the tension of its spring 48, and the arms 69 will be in the lowermost position, as shown in Fig. 2. The actuation of the rack 2 by the rotation of the crank 5 will allow the cover plate 57 51, the arms 69 will be pressed downwardly,

and the rod 6 will remain in its lowermost position until the arm 10 of the rack engages the stop which has been set in its path, whereupon the rod 6 will be raised carrying with it the projection 39, and the clutch roller 46 will be prevented from locking the rack against the small remainder of its stroke due to the shifting of the locking member 34 from the notch 37 to the notch 38. After the rack reaches this end of its stroke and sets the locking member in the upper notch 38, the operating crank 5 can be reversed in rotation causing a reverse direction of the arms 69 until they too engage the uppermost roller 47. The rack is moved downwardly until the arm 10 strikes the collar 11, and as it approaches its lowermost position the projection 60 at the upper end of the rack engages the bent extremity of the link 58 raising the plate 57 from the opening 50. In order to reverse the stroke of the rack before the upper limit of its travel is reached, the lever 67 is manually raised, thereby preventing the engagement of the clutchlng roller 47 which ordinarily would tend to prevent the downward movement of the rack until the member had been shifted. This movement of the lever 67 releases the short-measure indicating means which appears in the opening 50.

It is obvious that others skilled in the art. to which this invention :relates may make various changeswithout departing from the spirit and sec e of the invention. Although particularly. esigned and intended'for use in connection with single-acting pumps, the invention may be applied to any mechanism in which it is desired to insure a predetermined length of stroke before reversal of the mechanism.

I claim 2-- 1. In a pump, a reciprocable rack, and means including oppositely inclined surfaces adjacent the rack and a stop roller disposed between each of the surfaces and the rack, and means for alternately actuating the rollers only at the ends of the stroke of the rackto permit reverse movement thereof.

2. The combination with a reciprocable member, of means including oppositely inclined surfaces and a roller between each surface and said reciprocating member to engage the member for preventing movement in opposite directions, and mechanism engaged by the member only at the ends of its stroke to set said means for ermitting the IBVBI'SG movement Of the mem 81'.

3. The combination with a reciprocable rack, of means including two oppositely inclined surfaces and separate rotation members betweenthe surfaces and the rack for preventing movement of the rack in o posite directions, and mechanism engage by neeogzos the rack at opposite ends of its stroke to alternately set one of said members to engage and' the other member to allow movement of the rack in the reverse direction.

in, The combination with a reciprocable member, of separate stop rollers and oppositely inclined wedging surfaces therefor adjacent the member to prevent the movement of the member in opposite directions, a single device operative to directly engage one but not both of the said rollers, and a rod connected to said device and having settable stops thereon engaged by the reciprocable member for moving the device at the ends of its stroke.

5. The combination with a reciprocable member, of .op ositely inclined bearing means adjacent t e member, spring-pressed rollers cooperating with said bearing means to prevent movement of the member'in opposite directions, a longitudinally movable rod, a member carried thereby having a projection to engage one but not both of the rollers at the same time, adjustable stops carried by the rod, and a stop arm carried by the reciprocable member and movable between the stops for moving the rod at the end of the stroke of the reciprocable member to release the clutch roller Which permits the reverse movement ofthe reciprocable member.

6. The combination with a reciprocable member, of a rotatable and longitudinally movable stop rod adjacent thereto, rollers and oppositely inclined wedging surfaces adjacent the member for preventing the movement of the member in opposite directions, a device carried by the rod for engaging the said rollers and unaffected by the rotation of the rod, and stops carried by the rod and brought into engaging position by rotation thereof to limit the travel of the reciprocable member, the engagement I of said stops by the member setting said rollers to permit the reverse movement of the reciprocable' member only upon a complete movement thereof in one direction.

7. The combination with a reciprocable member, of spring-pressed rollers and oppositely inclined surfaces therefor adjacent the member for preventing its movement in opposite directions, a stop rod engaged by the member at the ends of its strokes and moved a shortdistance thereby, a projection carried by said rod for alternately engagin said rollers as the member is reciprocate and means for holding the rod in either one of two positions.

8. In a pump, the combination with a reciprocable rack having a projecting arm, of

the projection of the rack is opposite to it, a visible device arranged to indicate the movement of said rack corresponding to the stop engaged thereby, and means for obscuring said device until the stroke of said rack is completed.

9. The combination with a reciproc'able member, of means for variously limiting the length of stroke, a device at one end of-the member for indicating the length of stroke for which the means has been set, and a cover for said indicating means operated by the member only at the end of the stroke of said member.

10. In a pump, the combination with a reciprocable rack, of means for predetermining the length of stroke of the rack, an indicator in connection with said means, and a spring-pressed cover for saidindicator engaged by the rack for disclosing the indicator at one end of the stroke of said rack.

11. In a pump, the combination with a re'ciprocable rack, of a rotatable stop rod therefor, means at one end of the rod for setting it to stop the rack at different lengths of strokes, means at the other end of the rod for showing the position in which the rod has been set, and a device actuated by the rack for uncovering the indicating means when the rack is at one end of its stroke.

12. The combination with a reciprocable member, of a rotatable and longitudinally movable rod having stops settable by the rotation of the rod to limit the travel of the member, a sleeve keyed to the rod for setting it in various rotated positions and permitting the longitudinal. movement of the rod, means for gripping the member to prevent movement in opposite directions, a device carried by the rod for releasing one but not both of said gripping means at the same time and depending upon the longitudinal position of the rod, a rotatable indicator for the rod, and means continuously connecting the indicator and the rod independent of the longitudinal movement of the rod.

13. In a pump, the combination with a reciprocable rack, of a settable stop rod which is longitudinally movable into one of two positions by the engagement of the rack therewith, gripping means for the rack, a device carried by the rod for releasing one of said gripping means to permit the reverse movement of the rack only when the rack has been moved to the end of its stroke in the other direction, and emergency means for releasing one of said gripping means to permit the reverse movement of the rack before a predetermined stroke has been completed in one direction of movement.

14. The combination with a reciprocable member, of gripping means for preventing its movement in its directions of reclprocation, a stop .rod engaged by the member and member.

longitudinally movable with a projection therefrom to engage one of said grlpping means to permit the reverse movement of the member when a stroke has been completed in one direction, and an emergency device for engaging the said gripping means to permit reversal of the reciprocating member before a stroke is completed in one. direction.

15. The combination with a reciprocable member, of gripping means for preventing movement thereof in the directions of reciprocation, a stop rod for the member movable by engagement thereof into one of two positions, a device carried by the rod for engaging one but not both of said gripping,

means, and means depending upon the direction of movement of the reciprocating member for preventing the engagement of the gripping means when the rod is moved from one position to the other near the end of the stroke of the said reciprocating cating the length of movement of the mem-' ber, a cover operated by the member at one end of its stroke to disclose the indicating means, emergency means for permitting the reversal of the member between the limits of its stroke, and a visible indicator for showing that less than a full stroke of said member has been made.

18. In a single-acting pump, the combination with a rack reciprocable to pumpdifferent quantities for different return strokes thereof, gripping means tending to prevent the reciprocation of the rack in both directions, a rotatable and longitudinally movable stop member having means to rotate the rod to set diii'erent stops in the path of the rack, meanscarried by the rod for actuating the said gripping means by its longitudinal movement to permit the reversal of the rack when it completes a stroke in-the other direction, a quantity indicator which is set for the diiferent quantities upon the rotation of the rod, a perforated plate through which the said quantities are visible, a spring-pressed cover for the perforation, means carried by the rack for raising the cover at the end of its return stroke, emergency means including a manually operable handle for actuating the gripping means to permit reversal of the rack intermediate the ends of its strcke, and a spring-pressed innicater normally engagerl by the said emergency lever anal movable upon the actuation of the lever so that it is visible through the perforated plate to show that less than the neeefiee quantity for which the step rod has been set has actually been pumped.

' In testimony whereof I have signed my 10 name to this specification on this 10th day of April, A, D. 1918.

ROBERT P, (JALLARD.

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