US1441829A

US1441829A - Air pump

Info

Publication number: US1441829A
Application number: US374097A
Authority: US
Inventors: Charles D Brandt
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-04-15
Filing date: 1920-04-15
Publication date: 1923-01-09
Anticipated expiration: 1940-01-09

Description

Jan. 9, 1923. 1,441,829..

0. 0. BRANDT.

AIR PUMP.

FILED APR.15. 1920. 2 SHEETS-SHEET l.

' llu;

A TTOB/VEVS C. D. BRANDT.

Jan. 9,1923.

AIR PUMP.

FILED APR. 15. I920.

2 SHEEIS-SHEET 2.

q 42 Minimum 4/ 7 h v l/Vl/E/VTOR UL ad. BY 0; M ff ml g ATTORNEYS WITNESSES comprising a continuation of the axial bore l atcnted .illan. Q, llhiilli.

llll l lrrltln starry;

ones. are n. nnannr, or new roan, n. r;

nrn rmirr.

Application filed April 15, 19230... Serial No. 374,097.

il o all 10/1/0712, may concern l lie it known. that I, CrrARLns ll). BRAND'J, a citizen of the United States, and resident of Richmond Hill, borough and county of (Queens, city and State of NewfYork, have invented certain new and useful llniprove ments in Air Pun'lps, of whichthe following is a specification.

llly invention relates to air pumps and more particularly to that type thereof which is manually operatedjand is. used primarily for inflating pneumatic tires. The object of my invention is to provide a novel construction whereby the general serviceability and efficiency of the pump is increased and whereby its cost of production and maintenance is reduced to a minimum. My in vention will befully describedhereinafter and the features of novelty will be pointed out in the appended claims.

In the accompanying drawings, which show an example of my invention without defining its limits, Fig. 1 is anelevation of a pump embodying my invention; Fig. 2 is a cross section thereof on the line 2--2 of Fig. 1; Fig. 3 is a detail sectional view of the handle construction; Fig. l is adetail view of the piston rod; Fig. 5 is a section on the line 5-5 of Fig. 3; Fig. 6 is a similar view on the line 6-43 of Fig. 5; Figs. 7 and 8 are detail sections illustrating the cap tlastening; Fig. 9 is asectional "elevation of the plunger; Figs. 10 and 1.1 are sectional views on the lines.10- -1O and 11- 11 respectively of Fig. 9; Fi9x12 is a detail section of the locking Washer; and Figs. 13,14, 15,16 and 17 are detail views illustrating the stirrup construction. 1 i

As shown in the illustrated example the pump comprises the customary cylinder or barrel 10 of any suitable length and di ameter and the base 1]. to which one end of said cylinder is attached. The means whereby the cylinder and, base are connect ed rernresents one of the novel features of theinvention. By reference to Fig. 13 it will be seen that the one end of the cylinder 11ft) projects into a tubular neck 12 of the base .1 l and is formed with an enlargement 13 which within a complemental recess 1. .1:

'15 of said neck 12. With-this arrangement (o-operating shoulders 16 and 17 are prorid ul respectively in the neck 12 and on the evlindcr 11.0 and by engagement which each.

1 other prevent a separation of the cylinderand base in an axial direction. In order to positively lock said cylinder and base together against relative rotation or other relative movement, the baseis formed with an internal annular flange 18 which flares out wardly and engages the cylinder 10 beneath. the shoulder 17 as shown in Fig.13.

The base 11 with its tubular neck 1 12, bore15, continuing recess 14: and internal annular flange 18which in its initial condition occupies an upright position as shown by dotted lines in 13, may be produced in any convenient manneras by casting, it being understood that the diameter of the here 1.5 is such as to snugly fit. about the cylinder 10 when the latter is connected with the base 11. i

The cylinder 10in its original condition may be of. approximately even diameter throughout andis combined with the base 11 by inserting its one end into the bore 15 until it engages the end face thereof. In this position :the cylinder 10 projects between the recess 14: and the flange 18; by means of suitable mechanism this end of the cylinder 10 is expanded until the shoulder 17 is forced into firmsurface engagement with the shoulder 16. After this has been done the flange 18 is expanded, bymeans of a suitable tool, until its periphery is located beneath the shorilderl'? and in firm, rigid engagement therewith, it being under: stood that the parts are proportioned and located so as to secure thisresult.

lVith this arrangement, which is very simple and economical to produce, the cylinder 10 and base 11 are rigidly and securely fastened together against relative movement.

in all directions including rotation.

T he invention includes further a novel means whereby the stirrup may be conveniently connected with the base so as to be readily detached therefrom.

In the illustrated example which has been cho en. for (lGSUllPlIlVQ purposes, this means coiinprises a locking member 19 which is rotatably mounted upon the base 11 and extends therefrom as shown in Fig. 13 and which is formed with a preferably elongated head 20. The base 11 is further formed with lugs 21 located in spaced pairs at the corners oi the base if the latter is of rectangular form and being correspondingly arranged it the base is of other configuration.

ber 22 as shown in Figs. 13 and 15 or it may The I. stirrup ntiay comprise a rigid metallic memcomprise members 23 hinged together as shown in Figs. 16 and 17. In the latter case, which constitutes a folding stirrup, the hinge thereof is located within the confines of the base 11 when connected therewith; the purpose of this will appear more fully hereinafter.

In any case the

members

22 and 23 are provided with preferably elongated slots 24: having a width'andlengthito permit the passage therethrough of the head when the latter is -in registry with said slots and to prevent its withdrawal when said head is turned through'an arc of 45 sous'to extend transversely across said slots. The stirrup in the forms illustrated includes depending longitudinal flanges 25 which engage the lugs'2l and-prevent rotation 'ofthe stirrup relatively to the base about the major axis of-thelpump; it will beunderstood thatthese flanges 25xare not absolutely necessary and that the width of the stirrup is always such that it fits nicely between the lugs 21.

To'connect the stirrup with the base, the head 20 of the locking member 19 is passed through the slot 2% and then turned through anarc of forty-five degrees so as to extend transversely to the slot. The parts are so arranged and proportioned that the head 20, when turned as described, will bear against the stirrup and thus by pressing it against the base rigidly secure it in position; the lugs 21 prevent-rotation of the stirrup about the axis of the'pump. To-detach thestirrup it is simply necessary to turn the head 20 untilit registers with the slot 2i whereupon thelstirrup may be readily removed; With the arrangement described the pump and stirrup may be easily disconnected to facilitatecarrying in a tool receptacle and may be quickly'conneeted when the pump desired for use. If the hinged stirrup is used it is connected and disconnected in the same way as described but preferably occupies a position at right-angles to that/of the solid stirrup when connected with said base. In this form the members 23 may be folded up when the stirrup is detached from the ba 11 if for any reason this is desired. By having the hinge located within the confines of the base 11 the latter forms a stop whereby pivotal movement on the hinge is prevented when the pump pistonis actuated, particularly in an upward direction.

At-the end opposite to that at which the base ll is located the cylinder 10 is provided with the customary cap 26 having the usual axial opening for the passage of the piston rod. In the present instance this cap instead of being screw-threaded upon the cylinder 10 as is usually the case is connected there with in a novel manner. As shown in the illustrated example the cap 26 is formed with an annular flange 27 which [its over the cylinder 10 and is provided with one or more apertures :28, two located at diametrically opposite points being preferred. 'lhcsc apertures are arranged to register with similar apertures 29 formed at appro n'iatc points in the cylinder 10 and accommmlate fastening devices in the form of studs hav ing heads 30 and shanks 31 split in a lengthwise direction amlprovided with notches 32: the members comprising the split shank 31 are resilient and normally tend to spread apart as shown in Fig. 7. The studs arc inserted into the apertures 2% and .29 by pressing the shank members togidhcr; said members spreading apart because of their inherent resiliency as soon as the notches 2E2 register with the flange .27 and thus preventing said studs from being unintentionally withdrawn from said apertures. It will be understood that the shanks 31 are of such length as not to project inwardly beyond the inner surface of the cylinder ll) and that the notches 32 are located so as to snap over the peripheral surface of the apertures .28 when the heads 30 are in engagement with the-outer surface of the flange 27. \Vith this arrangement the cap 26 is positively loe-kcd upon thecylindcr 10 against unintentional removal in a simple and eflieient manner; to remove the cap the members of the shanks 31 are brought together against their resiliency, for instance. by exerting an outward pull upon the heads 30 suflicient to disconnect the notches 32 from the flange 2T.

Inaddition to the parts so far describcd the pump includes the customary packing cup or the like 133 carried by the stem or piston rod 31. which projects through the cap 26 and at its outer end is provided with an operating handle 3?. in the present invention both the packing cup or the like 33 and handle 35 are connected with the piston rod34 in a novel and cllicient manner.

As shown in the drawings the piston rod custom-34 is provided with

projections

36 and 37 which are located in co-operating pairs spaced from earl] other in the direction of the axis ol said stem 34 as shown in Fig. 9. In the preferred

form thcsc projections

36 and 37 comprise integral parts of the tcm formed by lmsctting the metal thereof by means of a suitable tool. The arrangement includes l'urther u mclallic d rshcd mcmbcr 3e having a central opcning Elf) and recesse Jill located preferably at diamclrically oppd site points of said opening for thc accommodation of said projections 3?. in assembling the parts this member 38 placed upon thc stem 3,. in proper position with the rcccsscs 14:0 in registry with the projcctions 2i? and moved lengthwise ol said stcm: as soon as said member 38 passes beyond said projections 37 it may be given a quartcr turn to bring the recesses lll out o.' registry wilh lllc projections Ill). The lcnglbwlsc movcmcul is then continued until said member finally ill! .lllll menses rests upon" said projections 36 as shown in Fig. 9. i The packihgeup or thelilze 33 whirh comprises a cup shaped meinber of leather or similar material having-an axialopening;- is nextplaeed upon the stem 34 in proper position and forced beyond the pr i jeetions 37 into engagement with the l'llel'llbtl 38. The device whereby the member 38 and packing cup orthelihe 33 are loclted in position oomprise's au'ietal washer 41-1. having an axial opening 4.2 and diametrically opposite recesses 'slz l'and beii'ig provided with sloping portions 'et'l which extend from the recesses 43 along the periphery ot the axial openin}: 4-2. ll1is-washer ll isplared upon the stemi-rl by passing" the retesses 4 3 over the projections 37 and isnioved into engagement with the'bottom ot the"pl.unger 33 so" as to lie within. the same as shown in Fig. 9. To this position the lower ends 01 the sloping pmrtions lei lie slightly below the projections 37 so that, when the washer 4]. is given a ('lIHH'tGl turn said IJIOjGCtlOI'lS ride along said sloping portions and come to rest upon the surfaceoit said w sher. i'ltf-l this happensa wedging action exerted upon the projections 3'7 whiel securely clamps the packing cup or the like 33 between the member 38 and the washer L1. andv firmly fixes all three elements between the projections 36 and S7 in this way the packing; cup or the like 33 is "fastened securely upon the stem 34 without shrew-threading any oi the parts in the ous-.

tou'iary manner and without requiring the use of any screws or other extrai'ieous fasten inn devices.

Any suitable means may be provided for preventing unintentional rotation of the washer 41 whereby its efiicieuey as looking medium might. be interfered with. For insta.uce,tl1e washer ell. may be provided with depressions 41 located preferably at (ha metrically opposite points between the reeesses a3 and arranged to receive the projertions 37 when the washer has been turned to its locking position. If desired the depressions may be duplicated upon both faces oi the washmll. to receive both pairs of projections 37 and 96 although one set oil? (.lQ:} ')].QSSl01'lS will generally be 'lfouml suliirient tor the intended purpose. in any case the eo-o ieration of the depressions and the pro" jeel ions will 'u'ercnt uuintei'itional rotation of said. washer ll ili'oi'n its locking position. .lleresses ll may be provided for the accommodation ot a suitable tool for facilitating the manipulation of said washer.

in the illustrated example the handle which may be eonstruited of wood or other suitable material and ot conventional size and shape provided with a transverse opening into which a ietal socket member 45 is tilted and held by i rielion and by means of projections it; wl ieh rxtmul into grooves t? formed in said landle and also preventrotation of the latter relatively to said socket member so. The latter is constructed with an end wall 4-8 and is internally screwthreaded for the reception of an externally srrew-threaded tuljmlar bushing: l provided having an (awning; ot substai'itially the same diameter as and in registry with the bore of the bushing a9 as illustrated in Fig. 3. The stem 34-. is jn'mided. with lugshl-l located preferably at diametrically opposite points andv prel'erabl y formed by iuisetting the metal oiwhich the stem constructed illoronneet thehandle' with the stem the latter inserted through the opening 51 and projected into the bushing a9 witl the lugs in registry with and moving lengtlr wise ot the slots untils the end face of the stem 3d: eontacts with the end wall 48. The stem and handle are'then rotated. relatively to each other in a directionto move the'lugs into the transverse portions ol? said bay-' onet slots 50. The parts are so proportioned that as this occurs. the lugs will bear against the lower walls of the transverse portions of the bayonet slots 50 and will force the end face of the stem 3% against the end wall 48 under pressure so that a wedging action is exerted between said lower walls (if? the slots 50 and the end wall 4L8 of the soelcet member 4.5. ln this way not only the/handle itselt lirmly locked upon the stem 13% but the bi'ishing 4-9, in addition, is securely fixed in the member 45 against relative rotation and unintentional displacement. The handle may be readily detached by a reverse movement to bring the lugs from the transverse portions of the slots 50 into the longitudinal portions thereot; in this position of the parts the stem may be readily withdrawn from the bushing and thus separated from the handle.

The pump with the novel Matures herein enumerated and described represents an or- ;anizcatimi of maximum etlirienry and aim .Itity in which all parts may he eronoini rally produceifl and assembled. The disassemblilui' oi the pumps may also be ilCQOlll.

plished without a u ireriahle ellort whereby the packing of the pump in a tool kit or otherwise is facilitated.

Various ehanges in the specific form shown and described maybe made within the scope of the claims without departing from the spirit of my invention.

l claim:

1. The combination oi an end member. a tubular member extending into the same eooperatinr shoulders on said members whereby a separation thereot in a axial. dirm-tion is prevented and means comprising an integral portion of said end member whereby an internal pressure is exerted upon said shoulders to clamp them together.

2. In an air pump, the combination of a base. a neck projecting from said base and provided with an axial bore, an annular shoulder forming a continuation of said bore, a pump cylinder fitted within said bore, an annular shoulder forming a continuation ot said cylinder and fitted against the annular shoulder of said neck and an annular flange-comprising an integral part of said base and-extending beneath and in engagement with the annular shoulder of said cylinder to clamp same against the shoulder of said neck.

3. In an air pump, the combination of a base, a pump cylinder carried thereby, a stirrup member comprising two sez-tions hinged together and provided with a slot in registry with the hinged connection, said stirrup member extending transversely beneath and beyond said base and alocking member rotatably mounted on said base and arrangedto project through andtransversely across said slot to detachably lock said stirrup member on said base.

4. In an air pump. the combination of a base, a pump cylinder carried thereby. a stirrup member provided with a slot and extending transversely beneath and beyond said base and a locking member rotatably mounted on said base and arranged to project through and transversely across said slot to detachably lock said stirrup member on said base.

5. In an air pump. the combination of a base. depending fianues extendin; along opposite edges thereoi. a pump cylinder carried by said base. a stirrup member located beneath said base and between the flanges thereof. said stirrup member bein; provided with an elongated slot. a lo(-kin; member rotatahlymounted on said base and an elongated head arranged to pass through said slot and transversely across the same in sur- 'l"a :e ennzmement with said stirrup member to detachably lock same upon said base.

In testimony whereof I have hereunto set my hand.

CHARLES D. BRANDT.