US2874933A - Power actuated pin puller - Google Patents

Description

Feb. 24, 1959 Y l .1. E. Flrucl-rr` A2,874,933

' POWER ACTUATED PIN PULLER' Filed March 16. 1955 3 SheetS-Shet 1 INVENTGR. JACOB E. FEUGHT ATTORNEY Feb. 24, 1959 J. E. FEucHT 2,874,933

POWER ACTUATED PIN FULLER f Filed March 1e, 1955 s 'sheets-sheet 2 IIB INI/ENTOR. JACOB E. FEUCHT Fb. 24, 1959 J. E. FEUCHT POWER ACTUATED PIN FULLER 3 Sheets-Sheet Filed March 16, 1955 Ihn,

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INVENTOR. JACOB E. FEUCHT FIG. I4

ATTORNEY United States Patent l 2,874,933 A POWER A'CTUATED PIN PULLER Jacob E. Feucht, Garfield Heights, Ohio, assigner to Cleveland Rock Drill Division, Westinghouse Air Brake "Company, Pittsburgh, Pa., a corporation of Pennsylvania Application March 16, i955, Serial No. 494,646 2 Claims. (Cl. 25d- 18) This invention relates broadly to pin pnllers and more specifically to a power actuated pin puller having a vibrro tory impact element operatively associated therewith.

In the construction of buildings, highways or any structure utilizing concrete the common practice is to employ either wooden or metallic forms during the pouring and setting of the concrete. The metallic forms usually consist of several parts joined together by pins `or the like and when one part or section of a form is joined to another, pins are the means used to secure the sections together. While the use of pins in assemblingthe various parts of the metallic forms, and in connecting one sec- `tion to another, has been very satisfactory, considerable diil'iculty has been encountered in attempting to separate one section of a form from another.

It has been ascertained that quite often the pins used in metallic forms become so frozen or anchored in the `forms as to almost preclude `their removal therefrom. This freezing or anchoring of the pins in the forms is due, in the majority of instances to the concrete overflowing the form or splashing upon the pins during the pouring operation. Thus as the concrete hardens the pins become anchored or frozen in the froms so that a considerable amount of time and effort is usually expended in effecting the removal of the pins before the forms may be stripped from the concrete and used again at another location.

While the pin or bolt pullers of present day construction are readily capable of removing the pins or bolts from metalliciorms, under normal conditions, they very often are not able to eiiect the removal of any pins or Abolts that are frozen or anchored in the forms. This is due in a large measure to the fact that pin pullers of prior construction are capable of exterting only a constant pull upon the pin which is insuflicient to break the pin loose from `its frozen or anchored condition.

j The present invention is directed to a structure that `is designed to effect the ready removal of form pins that may Ibe anchored or frozen in the forms. l,

` One of the objects ,of the present vinvention is to provide apin puller having means to impart a vibratory force for loosening frozen or anchored pins in metallic concrete forms. t j t Another object is to provide a pinjpuller having Ia vibrator mounted thereon adjacent the pin gripping device to impart a vibratory force to a form pin for loosening the pin as a lifting pressure is applied to the pin.

`Anotheuobject is to provide a pin puller having a recting impacts to the pin gripping device in an upwardly `valve member adapted to control the vibrator when suiii- `cient lifting pressure has been imparted to the pin puller for loosening frozen or anchored iorm pins.

Still further objects are to` provide a pin puller having j `a vibrator associated therewith which iscompact, posi- `tivein its operation and economicalof manufacture.

Other objects and advantages more or less ancillary 'to 'the foregoing and the manner in which all of the various `vibrator associated with the pin gripping device for dij 'ice objects are realized will appear in the following descri ition, which considered in connection with the accompanying drawings, sets forth the preferred embodiment of the invention.

Referring to the drawings wherein the preferred embodiment of the invention is illustrated:

Figure 1 is a iront elevational view of a pin puller embodying the present invention with a portion thereof shown in section;

Figure 2 is a top plan view of the pin puller of the present invention, looking in the direction of the arrows 2-2 of Figure l; j ,j

Figure 3 is a vertical sectional view showing the air inlet conduit and valve member with actuating handle, the view being taken on a plane indicated by line 3--3 of Figure 2;;A

4Figure 4 is a vertical sectional view of the control valve of the pin puller showing the valve in position for delivering air to the cylinders of the pin puller, the View being taken on a plane indicated by line 4-4 of Figure 3;

Figure 5 is a vertical sectional View of the control valve illustrated in Figure 4 and showing the valve in a closed position; j

Figure 6 is a vertical sectional view of the control valve illustrated in Figure 4 and showing the valve in position to vent or exhaust the cylinders of the pin puller;

Figure 7 is a vertical sectional view of the control valve showing a spring loaded ball `member for limiting the indexing movement of the control valve actuating member, the view being taken on a plane indicated by line '7-7 of Figure 3;

Figure 8 is a vertical sectional View through the vibrator member of the pin puller showing the piston at the top of its travel, the view being taken on a plane indicated by line li-S of Figure 2; v

Figure 9 is a view similar to Figure 8 only showing `the piston at the bottom of its path of travel;

`Figure l0 is a horizontal sectional view showing a portion of the pin gripping mechanism of the pin puller, `the view being taken on a plane indicated by the line lil-1i) of Figure l;

Figure ll is a horizontal sectional view of another portion of the pin gripping mechanism of the pin puller, the view being taken on a plane indicated by the line lle-'- 11 of Figure l;

Figure l2 is a horizontal sectional view of another portion of the pin gripping mechanism of the pin puller, -the view being taken on a plane` indicated by the line l12--12 of Figure l;

Figure i3 is an enlarged view of a fragmentary portion of one of the air cylinders of Figure 1 showing the hydraulic cylinder associated therewith with the ball valve mechanism in one position of operation;

Figure `l4 is a view similar to Figure 13 only showing the ball valve mechanism in another position of operation; and

Figure l5 is a horizontal sectional view showing a detailed arrangement of the hydraulic cylinder ball valve mechanism, the view being taken on a plane indicated by line 15--15 of Figure 14.

Referring tothe drawings there is shown in Figure l a pin puller of the air-hydraulic type comprising a pair of spaced cylinders 2li, each having a work or ground engaging point or projection 21. In as much as both of the air-hydraulic cylinders 20` are identical in construction and mode of operation a detailed description will be given of only one cylinder. i

`Thercylinder 20 has slidably positioned therein, adjacent its upper end, a piston 22 which is formed with a- 'block member 36 through. a bushing 59.

an inner cylinder or tube 25. The enlarged end portion 24 of the tube 25 is adapted to have a sliding lit within the cylinder 2t) in a manner comparable with that of the piston 22, while the tube 25 is spaced throughout its length from the inner surface of the cylinder 20. The piston 22 and enlarged end portion 24 of the tube 25 have interposed therebetween an annular packing 27 which engages the inner surface of the cylinder to prevent air or fluid from flowing past the piston 22.

The lower or bottom end of the tube has a plug 28 threaded therein which plug is formed with an internally threaded recess 29 for the reception of the reduced inner end portion 30 of the ground engaging projection 21. The lower or bottom end of the cylinder 29 is formed with a collar or spacing member 31 on its inner surface which is adapted to have a sliding iit with the external surface of the inner cylinder or tube 25. The inner tub 25 is filled with a fluid 32.

The upper end of the cylinder 20 has threaded thereon a cap or closure member 34 which is formed with a radially projecting external arm 35 that terminates in an enlarged annular block member 36. The cap or closure member 34 has a depending rod 37 mounted therein which extends through the piston 22 and into the tube 25 where it terminates adjacent the plug 28. The upper end of the rod 37 is formed with a reduced portion 33 that extends through 'an aperture in the cap 34 for engagement with a locking nut 39. The cap 34 and piston 22 are provided with suitable packing rings 40 and 41, respectively, for sealing the rod in said cap and piston. The lower end of the rod 37 has an annular disk or plug 43, Figures 13-15, mounted thereon which acts as a dashpot in the fluid 32 Within the tube 25.

As shown in Figures 13-15, the rod 37 is formed with a reduced lower end portion 44 which extends through the plug 43 terminating in an annular recess provided in the bottom surface of said plug. The reduced end portion 44 has a nut 45 threaded thereon for retaining the plug 43 on the end of the rod 37, which nut is spaced from the portion of the plug 43 defining the recess so that an annular passage 46 is formed between the nut 45 and plug 43, Figures 13 and 14. The plug 43 is formed with a plurality of spaced passages 47, Figures 14 and l5, that provide communicationV between the top of the plug 43 and the annular passage 46 so that uid may How from one side of the plug to the other. The spaced passages 47 are counterbored throughout a portion of their length Vto dene valve seats for ball check valves 48 which are restricted in their movement within the counterbored portion of the passages 47 by pins 49. The plug 43 is also formed with by-pass passageways 50 adjacent the counterbored portions of passages 47 which will permit the plug 43 to move through the fluid 32 in the tube 25 at a faster rate in one direction of .movement than in the other direction. Y

The, closure member 34, for the cylinder 20, Figure 1, and the arm 35 are formed with an inner passageway 52 which communicates at one end with a chamber 53 in the upper portion of the cylinder 20 superjacent the piston 22. The other end of the passageway 52 communicates with a passage 54 that extends through the block member 36. The passage 54Figures 3-6, has radiating therefrom a passage 55 which in turn communicates with a passage 56 in which is mounted a rotatable sleeve valve 57. The sleeve valve 57 is formed with a stem 58, Figure 3, which projects outwardly from one side of the The outer end of the valve stem 58 has a knurled handle 66 threaded thereon and secured thereto by a pin 61. Thus upon rotation of the knurled handle 60 the sleeve valve 57 can be rotated or indexed from one position to another therebycontrolling the passage of air under pressure through the various passages tothe chamber 53; The

block member 36-has formed thereon, diametrically opposite the handle,60,r-n outwardly projecting air inlet nipple 62 which is coupled at its free end with a hose or con'- duit 63 that is in turn connected to a suitable source of air under pressure, not shown. The nipple 62 delivers air under pressure to the sleeve valve 57 by way of a passage 64, Figure 4, provided in the block member 36. The sleeve valve member 57 is formed with a port 65, Figure 4, that communicates with passage 56 fior deliver ing air under pressure to passageway 52. The sleeve valve member 57 is also formed with an annular recess 66, Figure 6, which extends over a portion of the valve to provide communication between passage 56 and an exhaust or outlet port 67 formed in the block member 36 for venting the chamber 53 of the cylinder 20.

As shown in Figure 7, the block member 36 is bored for the reception of a spring loaded ball 69 that engages spaced detents or recesses 76 formed in the sleeve valve 57.

A plug 71 is threaded in the bore in the block member 36 for engaging and urging the spring 72 and in turn the ball 69 into the detents in the sleeve valve member 57. The amount of pressure required to rotate the handle 60 and in turn the sleeve valve member. 57 is determined by the lplug 71 and spring 72. T he knurled handle 60 and the nipple 62 constitute hand grips for the tool operator.

As shown in Figure 1 the cylinders 20 have interposed therebetween, slightly below the central portion thereof, a cross arm or plate 74 which terminates in outwardly projecting bosses 75 that engage the inner surfaces of said cylinders, Figure 2. Each of the bosses 75 are bored to receive the ends of yoke members 76 which extend around the cylinders 20 with nuts 77 threaded on the ends of the yoke members for securely anchoring or at'- taching the cross arm 74 to the cylinders 20. The cross arm 74 is formed with a central recessed portion 78, in the lower face thereof, for the reception of the head 79 of a depending stud member Si). The head 79 of the stud member 80 is secured to the cross arm 74 by bolts 81.

The stud 8i), Figures 1 and 11, is provided with a transversely extending bore adjacent its lower end for the reception `of a pin 83, the ends of which extend beyond the respective faces of the stud 80 for carrying and supe porting a pair of opposed outwardly extending arms 84 and 85. The ends of the arms S4 have a pin 86 freely mounted therein and a pin S7 is freely mounted in the ends of the arms 85. The pin 86 has mounted thereon intermediate the arms 84 a boss 8S of a depending link 89, Figure l, and the pin S7 has mounted thereon intermediate the arms a boss 90 of a depending link 91. The depending links S9 and 91 are formed adjacent their lower ends with bosses 92 and 93, respectively, which have pins 94 and 95, respectively, extending therethrough for supporting the spaced arms 96 and 97 of a plate member 9S, Figure l2. The bosses 92 and 93 have formed integrally therewith on their lower faces inwardly extending jaw members 99. The plate member 98 has formed integrally therewith a pair of spaced upwardly projecting guide members 19t) which extend between the arms 84 and 85 on opposite sides of the stud 80 and terminate in a rectangular shaped collar 101 that encircles the stud 80, Figure l0.

The cross arm or plate 74 has mounted on the top or upper surface thereof a vibrator member 163. The bolts 81, which secured the head 79 of the stud member 80 to the lower surface of the cross arm 74, extend through said cross arm and into the vibrator 193 for securely an-choring the vibrator to the cross arm. The vibrator 193 is formed with a vertically extending annular recess 154 constituting a cylinder, Figure 8, in which an elongated tubular piston is adapted to reciprocate 'upon the introduction and exhausting of air under pressure. The piston 165 has formed therein, and extending downwardly from the top surface thereof, a passage 106 which terminates at a point slightly below the center of the piston in a radially extending passageway 167. The pisaardgas to a point slightly above the center of the piston where it communicates with an angled passageway 109. The recess or cylinder 104 is provided at approximately the central portion thereof with an annular recess or groove 110 which is adapted to register with the passageways 107 and 109 and in turn passages 106 and 108, respectively, during the path of movement of the piston 105. The annular groove 110 communicates with a vertically extending passageway 111, formed in the vibration 103, which passageway communicates with a conduit or hose 112 which is connected to the vibrator by a suitable fitting 114. The conduit 112 is provided with a suitable fitting 115 on its other end, Figure 1, which is threaded into the block member 36 and communicates with passage 54. The vibrator 103, Figure 8, is provided in one face thereof with exhaust ports 116 and 117 which cornmunicate with the top and bottom portions, respectively, of the cylinder 104.

In the operation of the pin puller the points or projections 21 are set upon the form in order to take the counter force when the cylinders 20 are actuated by air under pressure. With the pin puller so supported the handle 60 is rotated one detent or recess under the action of spring 72 and ball 69 which rotates the sleeve valve 57 so that port 65 of said valve registers with passage 56. Upon the registering of port 65 with passage 56 air under pressure is delivered from conduit 63 through the sleeve valve 57 passages 5655-54-52 to the chamber 53 at the upper end of each of the cylinders 20. As the air under pressure Hows into chamber 53 it acts against piston 22 and the cylinder cap 34 causing cylinders 20 to be extended, which action raises the cross arm 74 and in turn the lever operated gripping device consisting of the links 89-91 and jaw members 99. As the cross arm 74 is raised the jaw members 99 are caused to move towards one another about the pins 94-95 and 86u87 for gripping the form pin P, Figure l.

When the air rst Hows into chamber 53 for extending or raising the cylinders 20 and cross arrn 74 with jaw members 99 the air pressure will be relatively low. However, as the cross arm 74 rises and the jaw members 99 engage the form pin P a pulling tension will be put upon the form pins P which will cause the air pressure to rise in the cylinder chamber 53 until it reaches the pressure of the air being supplied or delivered through the conduit 63. Furthermore a hydraulic ram eiect is developed through the movement of rod 37 and the dashpot metering plug 43 through the uid 32 in the tube 25 contemporaneous with the raising or elevating of the cylinders 20. When air is rst delivered to chamber 53 the pressure of the air in the chamber and the passages leading thereto from the sleeve valve 57 is relatively low so that the vibrator 103 remains inoperative during the low pressure period. However, as a pulling force or tension is placed upon the form pin P through the jaw members 99 the pressure of the air will start to increase and this increased air pressure will cause the vibrator 103 to operate and its speed and blow intensity will increase as the charnber 53 and cylinder 20 air pressure increases.

The air under pressure that is delivered to the vibrator ilows through conduit 112 to passage 111 from where it is directed to the annular groove 110. The air liows from groove 110 through passageway 107 and passage 106 to the top of cylinder 104 where it forces piston 105 from the position shown in Figure 8 to that of Figure 9. With the piston in the position of Figure 9 passageway 109 and passages 108 are brought into registry with the annular groove 110 for delivering air to the bottom of cylinder 104 to force piston 105 upwardly in the cylinder. It is to be noted that when piston 105 is in either its lower or upper position that the respective exhaust ports are in communication with the top and bottom portions of the cylinder for exhausting the air therein. `The speed or reciprocatory movement of the piston 105 increases as the air pressure builds up in the system so that piston imparts a vibratory force and impacts in an upward direction to the cross arm 74 and in turn the form pin P through the jaw members 99. The vibratory force and impacts created by the reciprocatory movement of the piston will cause the form pin P to be vibrated so that it will gradually become free from its frozen or anchored condition.

When it is desired to stop the action of the vibrator 103 but to still maintain the cylinders 20 in an extended or elevated position the handle 60 may be rotated another notch or recess so that the sleeve valve 57 is rotated to Where port 65 is moved out of registry with passage 56, Figure 5. Upon the removal of form pin P the sleeve valve 57I may be rotated through handle 60 to the position of Figure 6 wherein outlet port 67 is brought into communication with chamber 53 through the various passages. As the air from chamber 53 is vented to the atmosphere cylinders 20 will gradually return to their original or initial position. The movement of cylinders is controlled by the passage of the rod 37 and dashpot metering plug 43 through the fluid 32 in the tube 25. It is to be noted that the use of air and hydraulic cylinders 20 and 25 causes the action or movement of the cylinders 20 to be smooth and even thus eliminating the possibility of the pin puller from jumping if the jaw members 99 should happen to slip oi of the form pin P or if the form pin P is suddenly loosened.

I claim:

1. A pin puller comprising a pair of spaced cylinders each having a piston therein, a plate member interposed between and connected to said cylinders, depending jaw members carried by said plate member, a vibrating member mounted on said plate member for imparting a vibratory force and impact to said jaw members, a source of air under pressure connected to said cylinders and vibrating member for extending the cylinders with respect to the pistons to apply a pulling tension upon a pin engaged by said jaw members prior to actuating said vibrating member, a rotatable valve member for controlling the air delivered to said cylinders and vibrating member, a spring loaded ball member engageable with recesses in said valve member for holding said valve member in a plurality of predetermined positions during its rotative movement, said valve member, in one of its positions, controlling the delivery of air under pressure to said cylinders and vibrating member.

2. A pin puller comprising a pair of spaced cylinders, a plate member interposed between and connected to said cylinders, depending jaw members carried by said plate member, a vibrating member mounted on said plate member for imparting a vibratory force and an impact to said jaw members, a piston in each of said cylinders, said pistons having a reduced end portion connected to a uid filled tube positioned within Vsaid cylinders, a rod connected to each of said cylinders and extending through the piston into the uid in said tube, a dashpot plug secured to the end of the rod within said tube for coutrolling the movement of the cylinder with respect to the piston, a source of air under pressure connected to said vibrating member and to said cylinders intermediate the pistons and the top of the cylinder, valve means for controlling the lair delivered to said cylinders and vibrating means for extending the cylinders with respect to the pistons while moving the dashpot plug through said fluid to apply a pulling tension upon a pin engaged by said jaw members prior to said vibrating member being actuated. i

References Cited in the file of this patent UNITED STATES PATENTS Kenny July 28, 1953

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