US2504269A - Liquid dispensing apparatus of the extensible hose type - Google Patents

Description

April 18,- 1950 J. A. LOGAN LIQUID DISPENSING APPARATUS OF THE EXTENSIBLE HOSE TYPE s Sheets-Sheet 1 Filed NOV. 1, 1947 2 N 1 a R A S I I. Z 0 6 Y 2 4 1 mu M V O l m run H n, K m m 1 w M m z a o m M w "w Y J Y 1 B m m a Z 3:41.... Q 7 & v 1 "w 3 IT M J In 4. J J W u 0 "ll f o m I I I I I I I I I I l l l I I I I I I I I I I I l I 111k; r J I \l /2 1 w a u u a n H x I. mzm J h U E 1 J 1 z 1 m .7 I M 1 0. 46 I 6 2 4.. A

. J. A. LOGAN LIQUID DISPENSING APPARATUS OF THE EXTENSIBLE HOSE TYPE April 18, 1950 3 Sheets-Sheet 2 Filed NOV. 1, 1947 INVENTOR Joazpu A. Law) Apnl 18, 1950 J. A. LOGAN 2,504,269

LIQUID DISPENSING APPARATUS OF THE EXTENSIBLE HOSE TYPE Filed Nov. 1, 1947 3 Sheets-Sheet 3 INVENTOR balm/1 Al ape/v BY Cid gr ATTO NEYS Patented Apr. 18, 1950 UNITED TATES LIQUID DISPENSING APPARATUS or um nx'rrz vsmnn nose TYPE Joseph A. Logan, Hadley, Mass, assignor to Gil bert & Barker Manufacturing Company, West Springfield, Mass., a corporation of Massachusetts Application November 1, 1947, Serial No. 783,458

6 claims.) (01. 222 14) This invention relates to improvements in a liquid dispensing apparatus, suchas is used at filling stations in selling gasoline, and is a. con tinuation in part of my prior United States patent application Serial No. 748,198, flied May 15, 1947, and now abandoned. w l

The main object of the invention is to provide an improved dispensing apparatus, which retains all of the advantages disclosed'in United States patent to Hope No. 2,242,749, granted May 20, 1941, and provides additionaladvantages, which tend to make the work of the operator easier and yet tend to prevent use of the apparatus in other than the planned manner. Regarding the prior art; it is old to provide a dispensing apparatus, generally called apump,

with an extensible and retractable hose handling device.

tractable hose handling device. The Hope patand has other advantages. There is much less need for hose pulling action in the day's work, as On the other hand, any

explained in said patent. extensible and retractable hose operation in con-, junction with the pump operation causes some The routine type has the general fault. of increasing the attendants work as compared to the usual pump having no extensible and reented type, referred to, avoids to' asubstantial extent the attendants extra work-mentioned .extra work, and an attendant is under a temptation. He can pull the hose out to its full extension, fasten it out, with a latch if there is one Fig. 4 is a fragmentary sectional view-taken on the line 4 4 of Fig. 3;

Figs. 5, 6, 79nd 8 are fragmentarysectional view 'illustrative of theoperation of' thehos'e latching means; a

Fig. 9 is anenlarged sectional view showing the hose nozzle support; motor switch handle and a latch for interlocking the latter with the hose latching means; and

Figs. 10, 11 and 12 are views taken from the leftof Fig. 9 and showing'the interlocking latch in various positions.

Referring to these drawings, there is shown in Fig. 1 a conventional form of gasoline-dispenser,-

embodying an electric motor 'I for driving, as by belt 2 -andpulleys3 and I, asuitablepump 5,-

which=draws up gasoline through a suctionpipe 6, "adapted for connection to an underground supply tank, and forces the gasoline out through v a discharge conduit. Starting from the outlet of the pump,the gasoline is forced through a pipe section 1, an air separator.8,a pipe ii, a meter 10, a pipe ll, visible discharge indicators I 2, a pipe I3 and aflexible hose I41 The air separator in- I eludes the usual liquid recovery chamber (not shown) which has a float controlled connection for the return of gasoline to thesuction side of the pump and avent to the atmosphere. The hose has on its outer end. a. valved hose nozzle I5, the valve of which'may be manuallyopened and closed by a lever l6. The gasoline, forced or by improvising a latch when oneis not furnished. Then he can serve allcustomers and escape any work involved in restoring the hose 1 to non-extendedcondition and having to pull it out again for any customer. The careless prac-v tice to escape work in this Way detracts from the appearance of the pump between'operations and it definitely places a hazard around thepump due to hose extension being exposed in careless fashion. 1

The new apparatus is shownby way of its preferred example in the accompanying drawings:

Fig. 1 is a sectional elevationalviewofa-gasoline dispensing apparatus embodying the-invention;

Fig. 2 is a view, taken from the left and-at right angles to Fig. 1 and just inside 'the casing of the apparatus, showing the hose-housing com- -1- partment of the apparatus together with the'hose,

its retracting means, its latching meansand part of the interlock with the motor switch operating handle; a

Fig. 3 is a fragmentary sectional plan view. Q

taken on the line 33 of Fig. 2;

through meter [0, is measured and theamount of thegasoline dispensed and the cost of 'the gasoline dispensed, either orhboth', are indicated on a suitable register ll,=which is driven by a shaft 18 from the meter.

The dispenser alsoiincludesa suitable housing .7 for many of the elements described.- In the-form shown, thishousing includes a base l9, fromwhich upstand four angle-iron. corner posts 20,

supporting acap 2l,and fourpan'els22, each suitably secured for convenient removal'andtogether enclosingthe space between the base and: cap. The front and back panels appearin Fig. w 2 and "the two side panels appear in' Fig. 1 and. the relationship of the frontpanel with the side panels is shownsin Fig-.3. Withinthis housin zle l5. Also located outside the housing are a handle 24 for actuating the switch of motor I and a crank 25 for resetting the register i1. Part of the flexible hose 14 ,between delivery operations, is displayed in a long loop on one of the side panels 22 of the housing as will be clear from Fig. 1. The rest of the hose is normally stored within the housing in amanner such that it can be drawn out, whenever required to extend the dispensing range, and drawn back when no longer needed.

The provisions enabling extension and retraction of the hose-from the pump housing are shown in Figs. 1 and 5. From Fig. 1, it will be seen that a vertical storage well 28 is formed between the left hand side panel 22 and a partition plate 21. This plate is suitably secured to and extends between the two adjacent corner posts 29, as shown in Figs. 2 and 3. Fig. 2 shows the inner end of hose 14 secured to the last one of the series of rigid pipe sections, the section l3, which is downtumed toward the top of the hose well 26. From section l3 the hose extends downwardly into the well, around a sheave 28 and thence upwardly out of the top of the well. From Fig. 1, it will be clear that the hose, on leaving the top of the well, travels across the housing over rollers 29 and 30, rotatably mounted at their ,ends in the side walls of an underlying trough 3i, and emerges from the housing between a pair of vertically-disposed rollers 32. It will be clear that on pulling any part of the hose, which is displayed outside the housing, some of the hose stored Within the housing may be drawn out against the resistance aii'orded by sheave 28. The latter (Fig. 3) has a slidable flt between the wall 21 and the adjacent wall 22 and can move freely upand down as the hose is pulled out from the housing or retracted therein. A bumper 33 (Fig. 2) is provided in the bottom of well 28 to noiselessly arrest the sheave at the end of its downward movement. A bumper 33', of resilient material is provided on plate 21 to noiselessly arrest sheave 28 at the end of the upward movement. The sheave serves as a tensioning means for normally holding a portion of the hose within the housing; for yielding to enable withdrawal of such portion of the hose by a manual pull thereon and for retracting such portion of the hose within the housing when the manual pull is relaxed. The arrangement for handling the inside hose length is in eflect that of a festooning device.

In order to relieve the attendant from the exertion of maintaining the pull on the hose l4 in order to keep the hose extended, latching means are provided which will hold the hose in any desired number of extended positions. The latching means may be of any suitable form. In the one example shown, a slide 34 (Figs. 2 and 3) is mounted to move vertically up and down as the axis of sheave 28 moves up and down due to extension or retraction of the hose. This slide (Fig. 3) lies between the described partition plate 21 and the sheave 28 and it is slidable in a vertical channel or slideway 35 formed'in plate 21. This'slide has right angularly turned side flanges 38, which slidably engage the sides of channel 35, and a part 31, which is bent inwardly from and at right angles to one side flange 35 and slides along the bottom wall of the channel 35. This part 31 forms a latch block. The slide has suitably flxed thereto a stud 38, which extends outwardly and into an axial hole in sheave 28. Thus, as the hose i4 is pulled out and the sheave 28 is drawn upwardly in the hose well 25, the slide 34 will slide upwardly in its guiding chan nel 35, and, when the hose is drawn back by the weight of the sheave, the slide 34 will slide downwardly as the sheave 29 descends in the well.

The slide is adapted to be held in different vertical positions by latching pawls 39, (Fig. 2) which are pivotally mounted at different elevations on the back wall of channel 35 and are adapted to engage a shoulder 40 on latch block 31 of the slide. There may be as many of these pawls as desired. The construction and operation of the latching means will best be understood from Figs. 5 to 8 inclusive. Each pawl 39 consists of one arm of a three armed member 4|, which is centrally pivoted on a stud 42, fixed to the back wall of channel 35. The other two arms, marked 43 and 44 are adapted to be engaged by a leaf spring 45, fixed at one end.

as indicated, to studs 46 on said back wall. The shoulder 40 is formed about midway on the inner edge of the latch block 31. Such edge has a straight portion 41 extending from the upper end of part 31 downwardly toward the shoulder 40 in parallel relation with the sides 38 of the slide. This portion 41 emerges with a cam 48, which extends to the shoulder 48. Below the shoulder is a straight portion 49, which extends downwardly in parallel relation to the sides 38,

to the bottom of the slide 34. The spring 45' normally engages one side of both arms 43 and 44 and then holds the awl 39 horizontal or at right angles to the straight edge 41. Such'edge is so spaced that it will not engage the pawl 39 when the slide is lifted. As the slide continues to move upwardly, the cam 48 will engage pawl 39 and turn it clockwise, as indicated in Fig. 6,-

flexing spring 45, which now engages only the outer end of arm 43. As the slide continues to rise the pawl 39 leaves the lower end of cam 48 and snaps in under the shoulder 40. The pawl will now hold the slide 34, if desired. However, the slide may continue its upward travel freely, if that is desired. The lowerstraight edge 48 is so located that the pawl must be tilted in order for the slide to pass. It is tilted upwardly, as shown in Fig. '1, and will be held by the edge 48 in this position until the slide rises far enough for the lower edge of edge 48 to leave the pawl 39, when the spring 45 will snap the pawl into a horizontal position. The slide can continue upwardly until it engages another pawl 39 which will operate in the same manner as just described or it may move downwardly. Assuming that slide 34 moves downwardly, the lower edge of the latch block 31 acts as a cam to engage the now horizontal pawl 39 and tilt it downwardly. The edge 49 will maintain this downward tilt of the pawl 39, as shown in Fig. 8, so that the slide may continue its downward movement, the shoulder 49 deflecting the pawl and the latter dragging along cam 48 until the upper end of the cam passes the pawl, when the spring 45 again restores the pawl to its normal horizontal position. The operator, when pulling the hose, can feel the increased resistance, when the pawl 39 rides up on cam 48, and he can also tell by feel when the pawl snaps past the shoulder 48, so that if he wishes to latch the hose, he can relax the pull just after the shoulder 40 has passed the pawl and allow the slide to move down until the shoulder 40 is engaged by the pawl. To release the pawl, he pulls on the hose until, he can feel by the lessened resistance that the slide has been lifted above a pawl. Then, by releasing the hose, the weight of sheave 28 will pull the slide downwardly and retract the hose.

As another means of apprising the operator of the positions in which he can latch the hose, the latter may be provided with a band of contrasting color, such as shown at 50'. When the hose is pulled out until the uppermost band 50' of Fig. 1 just shows outside the pump casing, the latch block 31 will have been raised far enough to carry the locking shoulder a, little beyond the outer end of the lower pawl 33 and so that such end will still be engaged with the surface 49. In other words, the latch block is so located that it can be released and allowedto move backwardly with the assurance that the shoulder will engage the pawl 39 and be locked thereby. Similarly, the other band 5| is so located that when it just shows outside the pump casing, the shoulder on the latch block will have been raised slightly beyond the upper pawl 39 and so that the latter is held by the surface 49 properly tilted so as to engage the locking shoulder and lock the slide, when the pull on the hose is relaxed.

Since a considerable pull is necessary to extend the hose, it cannot be expected that the operator can control the movement of the slide 34 with close accuracy. For example, it would be difficult for him to pull the slide just exactly to the point where the pawl 39 would swing in under the locking shoulder to hold the slide against backward movement. Hence, the surface 49 has 'been made relatively long to give the operator an ample range within which he can stop the slide and yet be assured that the pawl will engage and lock against the locking shoulder on backward movement of the slide.

The hose nozzle support 23 has a flanged inner end, which is secured by bolts 50 to a plate which in turn is secured to a pair of angle irons 20. A shaft 52, extends through and is rotatably mounted in the support 23. The handle 24 is fixed to the outer end of shaft 52. Fixed to the inner end of this shaft is an arm 53 which is connected by a link 54 to the lever 55 of the motor switch 56. When the handle 24 is positioned as shown in Fig. 10, the motor switch is off and, when the handle is positioned, as shown in Figs. 11 or 12, the switch is on. On the handle is an ear 51, which, when the motor switch is on, moves across the outer end of the nozzle support 23 and prevents one from placing the hose nozzle on the support. When the handle 23 is in ofi" position as shown in Fig. 10, the ear 5'l is removed to one side of the support 23 so that the hose nozzle, can be hung up on it. The handle 24 can be swung only between the two extreme positions illustrated, one in Fig. and the other in Fig. 11, the motion being-limited by any suitable means as for example by the switch lever 55.

For the purpose of making the operator restore into the hose well any hose that he has drawn out, a latch is provided for holding the switch in "on" position until released by full retraction of the hose. Such latch consists of a lever 58 pivoted intermediate its ends by a stud 59 to plate 5| and having on one end a tooth to engage a shoulder 50' on the hub of arm 53. A spring 6| urges the latch into position'to engage tooth 60. The latch 58 is connected by a Bowden wire 52 to a lever 53 pivoted at one end by a stud B4 to the plate 21 and having its other end projecting into the channel 35 in the path of the slide 34. The Bowden wire has a sheath 55 fixed at one end by an anchorage it to plate 5| (Fig.

10) and fixed at the other end by an anchorage 31 to the plate 21. When the slide 34 is in its lowermost position, the lever 53 will have been moved by slide 34 far enough to lift the latch 58 out of the path of shoulder 60 or into the position shown in Fig. 10. Then, the operator may.

-if he has removed the hose nozzle H from sup-' port 23, turn on the motor switch by swinging handle 24 into the on position shown in Fig. 11. If the operator should subsequently pull some of the hose out of the casing the slide 34 will be lifted to release lever 63, thus allowing spring 6| to move the latch 58 to engage shoulder 60. Now, the motor switch is locked in on" position and the motor cannot be stopped and the hose nozzle cannot be hung up on its support 23 until the operator has caused all of the drawn out hose to be retracted, when slide 34 will engage lever 43 and move it far enough'to cause the latch 58 to be lifted out of engagement with the shoulder 50.

Considering the practical aspect of the new apparatus or pump and the improvement it affords at the filling station; Between complete operating cycles in selling gasoline, the pump stands at its best appearance to influence customers to stop within the dispensing range of its displayed outside hose length, i. e. it helps avoid unnecessary work by the attendant in pulling out hose for an extended range of delivery. This advantage was pointed out in the Hope patent. When a customer fails to drive up within the range invited by the outside hose length, the hose is extended just enough and latched. The latch is an element added in the new combination to help save work. On finishing the delivery the attendant, because of the hose device being latched to hold the extended length, would be tempted to merely hang up the hose to wait for the next customer. Such a careless operation would sometimes result if no more than a latch mechanism were added to the structure of said Hope patent. Such an addition, however, would tend to defeat one of the main purposes of the Hope structure for this reason. As the prior art structure has been commercially used, the pump attendant holds the hose under tension at the desired point of extension for delivery. He uses one hand to hold the hose and one to work the delivery nozzle. Sometimes the hose is snubbed around the car body against its finish which is bad. If the hose were merely latched, the attendant would hold the cap of the gas tank in one hand and operate the nozzle with the other. This is a customary habit. It helps the attendant to put the cap back on the gas tank where it belongs at the end of a delivery. But if he merely had the Hope apparatus latched out he could follow his habit in holding the cap for the filling opening in one hand and controlling the nozzle delivery with the other. But at the end of the delivery he would be tempted to merely hang up the hose while in latched out position. This would defeat the main purpose of the Hope apparatus. It will be noted in that apparatus, it is provided for two hand" use and the attendant hangs up the hose while the hose tension automatically returns the extended part of the hose. That arrangement overlooks the interference with the habit and the advantage of holding the gas tank cap in one'hand. But this new structure, while retaining all the advantages of the particular prior art structure, adds the advantage of both. latching out the extended hose length and avoiding the careless hanging up of 7 the hose without unlatching the festooning device or hose retracting mechanism. It does this byv preventing the attendant turning oil? the pump motor until he has unlatched said device for it to automatically restore the outside length of hose to the normal length for hanging at the side of the pump. Then boththe main purpose of the prior art structureis accomplished more certainly and the work of the attendant is substantially reduced.

In this way the requirement of the new apparatus is that it be restored to rest in that condition of its best appearance, not only for the neatness of appearance and to avoid the hazard of hose lying on the ground but also in its best condition to invite the next customer to drive up within dispensing range of the unextendeo. hose length, the normal range involving the least work on the part of the attendant. The less work he has, the faster the dispensing service is, so the customer is benefited. I

The filling station owner, his customers, and the pump attendant are all benefited when as by this invention the pump attendant will naturally and easily manipulate the pump apparatus in the most eificient manner from all points of view.

It will be understood that, if and when the interlock between the motor switch and the hose retrieving device is objectionable because of oificial regulation or otherwise, or if the interlock is not desired for any reason, it may be removed and the described latching means may be used without it. For this purpose, all that is necessary isto remove the levers 58 and 63 and the Bowden wire operating connection between them. i

The invention having been disclosed, what is claimed is:

1. In a pump apparatus of the filling station type with an extensible and retractable dispensing hose, the combination of motor-operated measuring and indicating pump mechanism, a housing for the mechanism, a hose connected at one end to said mechanism, a discharge nozzle on the other end of the hose, a support on the housing for the nozzle, a switch for the motor, an interlock device to require the switch to be opened when the nozzle is on said support, and a tensioning device normally yieldingly retaining a portion of the hose within the housing for storage and 4 applying tension to the hose to draw it back after it has been pulled out from the housin by the attendant, the remaining portion of the hose hung outside the casing for hand use in untensioncd condition to meet most of the expected dispensing service without disturbing the hose inside the housing, said tensioning device being movable from an initial position in which all the first-named portion of the hose is stored in said housing to other positions when the hose is pulled out by the attendant, a latch operable to hold the tensioning device in at least one of said lastnamed positions, said latch being releasable by the attendant to enable the tensloning device to draw back into the housing such hose as has been pulled out of it, a second latch operable to hold the motor switch in closed position when moved to such position by the attendant, and means for releasing the second latch operable by the movement of the tensionin device into its initial posihose, the apparatus including a motor operated measuring and indicating pump mechanism, a housing for said mechanism, a hose festooning device in the housing of the type operable by tension and controlled by hose pull and release for hose extension and retraction respectively, a long hose having a portion of its length normally mounted on the festooning device in retracted position and the remaining portion in a long loop hung on the outside of the housing and long enough for hand use in untensioned condition to meet most of the expected dispensing service without disturbing the hose length inside the housing, said hose passing through the housing near the top and connected to receive the measured liquid, a, dispensing nozzle at the end or the hose, a nozzle support near the top of the housing, a motor switch, all in combination with that improvement which consists in a latch mechanism operable to hold against the return tension of the festooning device when a portion of the hose is pulled out of the housing to extend the outside hose length, said latchin mechanism operable by an attendant to unlatch the festooning device for its tension to automatically return any pulled out hose length to the inside of the housing; and an interlock mechanism in operating relation to the festooning device, the nozzle support, and the motor switch to require the festooning device to be in hose retracted condition before the motor switch can be turned-off and the nozzle hung on its support; said interlock mechanism having means operable to prevent turning off the motor switch when the festooning device is not in hose retracted position.

3. In a pump apparatus of the filling station type, the combination of a motor-operated measuring and indicating pump mechanism, a housing for said mechanism, a long hose and nozzle, a nozzle support on the outside of said housing, a motor switch manually operable from outside said housing, a self-latching extensible and retractable hose handling device inside said housing, said hose having a portion of its length stored within the housing and held there by said device and the remaining portion in a loop hung on the outside of the housing and long enough for hand use in untensioned condition to meet most of the expected dispensing service without disturbing the portion of the hose within the housing means operable by way of hose pull and release to unlatch said hose handling device, an interlock mechanism operable for a part thereof to move into position to block the operation of said switch when the hose handling device is latched in hose extended position and until it is unlatched and returned to hose storage position, whereby the attendant cannot shut off the pump motor until he has restored the hose handling device to its normal inactive condition.

4. In a dispensing pump of the filling station type, wherein a motor-operated liquid measuring and indicating mechanism'is provided ina housing and a long hose, connected at one end to such mechanism, extends downwardly into a vertical hose well and then upwardly in the latter, forming an inside loop, and then extends across inside the housing and then outside through an opening in the housing and then downwardly and upwardly in an outside loop which is displayed outside the housing with its outer end having a nozzle hung from a support on the housing, and a sheave is mounted in the bight of the inside loop operable by its weight to maintain the inside loop in the hose well, rising in the well as the hose is pulled out of the housing and falling in the well to retract the hose when the latter is released; a slide having a stud on which the sheave is rotatable, a vertical slideway on one wall of said well slidably receiving said slide, a latch block fixedly connected to the slide and having a lockin shoulder, a plurality of pawls pivotally mounted on said slideway in position to be successively engaged by the shoulder on the latch block, as the hose is drawn outwardly for locking the slide in different vertical positions in its slideway and enabling the hose, when drawn outwardly, to be latched in a plurality of positions; and means for releasing the slide from each pawl for downward movement, such means being operable by pulling outwardly on the hose a certain distance and then releasing it for downward movement by the weight of the sheave.

5. In a dispensing pump of the filling station type, wherein a motor-operated liquid measuring and indicating mechanism is provided in a housing and a long hose, connected at one end to such mechanism, extends downwardly into a vertical hose well and then upwardly in the latter forming an inside loop, and then extends across inside the housing and then outside through an opening in the housing and then downwardly and upwardly in an outside loop which is displayed outside the housing with its outer end having a nozzle hung from a support on the housing, and

a sheave is mounted in the bight of the inside loop operable by its weight to maintain the inside loop in the hose well, rising in the well as the hose is pulled out of the housing and falling in the well to retract the hose, when the latter is released; a slide having a stud on which the sheave is rotatable, a, vertical slideway on one wall of said well slidably receiving said slide, a latch block fixed connected to the slide and having a locking shoulder, a plurality of pawls pivotally mounted on said slideway in position to be successively engaged by the shoulder on the latch block, as the hose is drawn outwardly, for locking the slide in different vertical positions in its slideway and enabling the hose, when drawn outwardly, to be latched in a plurality of positions; and means for releasing the slide from each pawl for downward movement, such means being operable by pulling outwardly on the hose a certain distance and then releasing it for downward movement by the weight of the sheave, said hose having marks thereon to indicate with reference to the housing the various positions in which the drawn out hose may be latched.

6. In a dispensing pump of th filling station vertical hose well and then upwardly in the lat-,

ter, forming an inside loop, and then extends across inside the housing and then outside through an opening in the housing and then downwardly and upwardly in an outside loop, which is displayed outside the housing with its outer end having a nozzle hung from a support on the housing, and a sheave is'mounted in the bight of the inside loop operable by its weight to maintain the inside loop in the hose well, rising in the well as the hose is pulled out of the housing, and falling in the well to retract the hose, when the latter is released; a vertical channel formed in one wall of the hose well and having parallel side walls and a connecting back wall, a slide mounted for vertical sliding movement in said channel and having an outer wall and two parallel sides inturned from the outer wall and engaging the sides of the channel together with a latch block inturned from one of the sides and extending part way toward the other of the sides and riding on the back wall of the channel, a stud fixed to the outer wall of the slide and On which said sheave is rotatably mounted, said latch block having a locking shoulder, a plurality of pawls pivoted to the wall of the channel at vertically spaced points and located in the plane of the latch block and in the path of the shoulder on the latter, said pawls adapted to be successively engaged by the latch block, as it moves up and down in the channel, as the hose is drawn out and retracted, each pawl operable to engage said shoulder and hold the slide against downward movement, and means for releasing the slide from any pawl for backward movement, such means operable by pulling on the hose to lift the locking shoulder a certain distance above the pawl and then releasing the hose to allow the slide to be moved downwardly.

. JOSEPH A. IOGAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,242,749 Hope May 20, 1941 2,326,636 Grise Aug. 10, 1943 2,339,308 Waugh Jan. 18, 1944

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