US 2787225 A
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Description (OCR text may contain errors)
April 2, 1957 l.. c. ROTTER 2,787,225
Filed Dec. 2, 1955 United States Patent O PUMP Lutwin C. Rotter, Maplewood, Mo., assignor to The McNeil Machine & Engineering Company, Akron, Ohio, a corporation of Ohio Application December 2, 1955, Serial No. 550,612
6 Claims. (Cl. 103-195) This invention relates to pumps, and more particularly to so-called lance pumps particularly adapted for pumping lubricant or the like from a drum.
Among the several objects of the invention may be noted the provision of a pump of the class described which is more easily disassembled for cleaning or repair; and the provision of a pump of the class described which is economical to construct and reliable in operation. Other objects and features will be in part apparent and in part pointed out hereinafter.
The invention accordingly comprises the constructions hereinafter described, the scope of the invention being indicated in the following claims.
In the accompanying drawings, in which one of various possible embodiments of the invention is illustrated,
Fig. l is a longitudinal section of a pump of this invention;
Fig. 2 is a cross section taken on line 2--2 of Fig. l; and,
Fig. 3 is a cross section taken on line 3-3 of Fig. l.
Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.
Referring to the drawings, a pump of this invention is shown to comprise a pump tube 1. Threaded on the upper end of the pump tube 1 is an outlet body 3. An outlet iitting 5 is threaded into the body 3 at one side. The tting 5 holds in place an outlet check Valve 7. A piston rod 9 extends through the body 3 into, the pump tube 1. Packing for the piston rod 9 is indicated at 11. Threaded in the lower end of the pump tube 1 is a cylinder 13. A plunger has a sliding sealing tit in the cylinder 13. The plunger 15 has a longitudinal passage 17 extending downward from its upper end to a lateral passage 18 adjacent its lower end. The longitudinal passage 17 terminates at the lateral passage 18. The upper end of the plunger is counterbored as indicated at 19 to form a seat 21 for a ball check valve 23. The ball 23 is retained in the counterbore 19 by a pin 25.
Threaded o-n the upper end of the plunger 15 is a head 27, having a stem 29 projecting from its upper end threaded in a tube 31. The tube 31 has a threaded connection at its upper end with the lower end of the piston rod 9. Cotter pins 33 are provided for preventing unthreading of the tube 31, the rod 9 and the stern 29. The head 27 has lateral passages 35 above the upper end of the plunger 15. It contains a ball check valve 37 which is biased by a spring 39 to seat against the upper end of the plunger 15. The spring 39 is accommodated in a recess 41 inthe head 27. Threaded on the lower end of the cylinder 13 is a cylindrical extension 43. Threaded in the lower end of the extension 43 is a priming tube 45. A shovel rod 47 extends down from the lower end of the plunger 15 into the priming tube 45. This rod extends through a priming check valve 49 located in the extension 43. It carries a priming piston 51 in the priming tube 45.
In accordance with this invention, the shovel rod 47 2,787,225 :Patented Apr. 2, 1957 ICC 2 has a special quick-'detachable connection at its upper end with the lower end of the plunger 15. For this purpose, the lower end of the plunger is provided with a recess 53 which opens downward and laterally. This recess is made of T-shape in cross section (see Fig. l) so that there is provided in the recess above its lower end an upwardly facing shoulder 55. The upper end of the shovel rod 47 is formed of T-shape in cross section corresponding to the T-shape of the cross section of the recess, having a reduced stem portion 57 and a head 59. The head 59 tits in the recess 53 above the shoulder 55 and is adapted to bear against the shoulder, and the stem 57 fits in the portion of the recess below the shoulder. The head and stem4 of the shovel rod are adapted for lateral disengagement from the recess 53 through its open side upon detachment of the extension 43 from the cylinder 13, as will be made clear.
The priming check valve 49 is xed in a sheet metal spider member 61 which has a floating tit in a counterbore 63 toward the lower end of the extension 43. The check valve 49 is adapted to seat downward against a valve seat 65 held in place by a retainer ring 67. The retainer ring is held against a spacer ring 69 by the upper end of the priming tube 45, the spacer ring being held against a shoulder 71 at the inner end of a counterbore 73 in the lower end of the extension 43 below the counterbore 63. The check valve 49 is slidable with respect to the shovel rod.
The priming tube 45 has a sen'es of longitudinal slots 75. The priming piston 51 is mounted on the shovel rod in such manner as to have lost motion in respect to the shovel rod. For this purpose, the piston 51 is slidable on a sleeve 77 threaded on the lower end of the shovel rod. The sleeve has a head 79 at its upper end. A collar 81 seats against the lower end of the sleeve. A nut 83 is threaded on the lower end of the shovel rod to hold the collar in place, and is locked thereon by a cotter pin 85. The piston 51 is adapted to slide on the sleeve within the limits imposed by the head 79 and the collar 81.
Operation is as follows:
As will be understood, the pump is inserted in -a drum of lubricant or the like. Upon an upstrol of the piston rod 9, the plunger 15 and the shovel rod 47, the priming piston 51 is lifted and forces lubricant upward into the extension 43 and the lower end of the pump cylinder 13, check valve 49 opening to admit lubricant to the latter. The lost motion between the priming piston and the shovel rod improves the priming action by delaying the upward movement of the priming piston in respect to the upward movement of the shovel rod. Upon a downstroke of the piston rod 9 and the plunger 15, check valve 49 closes, valves 23 and 37 open, and the plunger displaces lubricant from within the extension 43 and the lower end of the pump cylinder through the passages 18, 17 and 35 to the pump tube 1 and out through the fitting 5 (assuming that the pump tube 1 has been primed).
To disassemble the pump for cleaning or repair, the assembly comprising extension 43 and the priming tube 45 is disconnected from the cylinder 13 by unscrewing the extension 43 from the cylinder 13. The disconnected assembly is slid down on the shovel rod 47 to the point where the upper end of extension 4.3 is below the lower end of the plunger l5. Then the shovel rod 47 may be disconnected from the plunger 15 by lateral disengagement ofthe upper end of the rod from the recess 53. This enables the cylinder 13 to be disconnected from the pump tube, and the latter to be disconnected from the head. As is apparent, reassembly involves the reverse procedure.
ln view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.
As various changes could be made in the above constructions without departing from the scope ofthe invention, it is intended that al1 matter contained in the above description or shown in the accompanying `drawings shall be interpreted as illustrative and not4 in a, limiting sense.
1. In4 a lance' pump, apump cylinder, a cylindrical extension-detachably connectedtothe lower end' of the pump cylinder, aprirning tubeat the lower end of. the extension, aplunger. having a. sliding sealing t in the pumpcylinder and adapted, to extend out of the lower endof. the pump cylinder, a shovel'rod extending downwardfrom theilower'end of the plunger into the priming tube andcarrying a primingpistonV in theY priming tube, said ,plunger havingva recess at its ylowerend which opens downward-'and laterally, andan-.upwardly facingshoulder in the recess :above the lower endof the recess, said shovel rod extendingiupwardinto therecess and having at its upper. endi ahead fittingin the recess above the shoulder and adapted to bear against the shoulder, the upper end of the shovel rod being adaptedfor lateral disengagement from withinthe recessupon .detachment of the extension from they cylinder.
2. In` a'lancepump, apunip tube, apumpcylinder at the? lower end the the pumpftube cylindrical extension having a threaded connection withthedower end of the pump cylinder, a priming tube at the lower end ofv the extension, a piston. rod extending through the pump tube, a plungerat the lower end of the piston rod having a sliding sealinct in'` thepump cylinder and adapted to extend out of the lower end of the pump cylinder, a shovel red extending downward from the lower end of the plunger into the priming tube and carrying a. priming piston intheprimingtube, said plunger having a recess at its `lower end ywhich opens downward and laterally, and an upwardly facing shoulder in the recess above the lower end of the recess, said shovelrod extending: upward into the recess and havingat its upper. endv a head tting in the recess above lthe shoulder andadaptedito bearV against the-shoulder, the; upperf end ofttheshovel: rod being adaptedffor lateral disengagementxfrom.within the recess upon detachment of the extension .fronrthe cylinder.
3. In a lance pump, a pump tub'eeapumpcylinder at the-lowerendofithe pump tube, a.cylindrical extension having threaded', connection :with the lower end 'of the pumpgcylinder, apriming. tube.- at the lower end of the extension,1 a piston` rod: extendingthrough the :pump tube, n plunger atitheV lower. endofthe pistonfrod having a sliding ',sealingsgfit in the pumpcylinder'and `adapted to extend outof: theflowerv end of' the' pump cylinder, said plunger having.ai.lateral passage adjacent its lower end andra longitudinal passage: from its upper end to the lateral passage,` upwardly opening-checkvalve means for said-.longitudinal passage,V a shovel rod extending downward from the lower end of the plunger into the priming tube andcarryinga primingpiston in the priming tube, an upwardly opening priming check valve between the priming piston and the plunger, said plunger, below the lateral passage therein, having a recess at its lower end which opens downward and laterally, and an upwardly facing shoulder in the recessabove the lower end of the recess, said shovel rod extending upward into the recess and having at its upper end a head litting in the recess above the shoulder and adapted to bear against the shoulder, the upper end off` the sfiovelfrody being adapted for lateral disengagement from within the recess upon detachmenty of the extension from the cylinder.
4. In a lance pump, a pump tube, a pump cylinder at the lower end of the pump` tube, a cylindrical extension having a, threaded connection with the lower end of the pump cylinder, a priming tube threaded in the lower end ot the extension, a piston rod extending through the pump tube, a plunger at thellowerendof the piston rod having a sliding sealing tit in the pump cylinder' and adapted to extend out of the lower: end ot the pump cylinder, said plunger havinga lateral passage adjacent its lower end and a longitudinal passage 'from its upper end to the lateral passage, upwardly opening checlcvalve means for said'longitudinalpassage, a priming valve seat held in the extension by the upper end of the priming tube, a priming check valve in the extension above and engageable with saidseat, a shovel'rod extending downwardlfrom tlie'lower end ot the plunger slidably through the priming check valve ntothe priming tube andcarrying a priming piston in the priming^ tube, said plunger, below the lateral passage therein, having a recess at its lower end which opens downward. and laterally, and an upwardly facing shoulder in' the recess above the lower end of the recess, saidshovel rod extending upward into the recess and having at its upper end a head fitting in the recess above the shoulder and adapted to bear against the shoulder, the upper end of the shovel rod being adapted for lateraldisengagement from within the recess upon detachment of the extension from the cylinder.
5. ln a lance pump` as set forth in claim 4, the recess being ofT-shape in cross section and the upper end of the shovel rod being of corresponding. Tshape in cross section.
6'. In a lancepump as set forth in claim 5, a spider member khaving a floating tit in the extension, said priming check valve being; fixed in said spider member.
ReferencesCitedin the tile of this patent UNITED. STATES PATENTS 2,122,020 Barks lune-28, 1938 2,136,636 nouer Nov. 15., 193s 2,258,493 H1111 oct. 7, 1941 2.636.441 woerter- Apr. 2s, 1953