US1840111A

US1840111A - Grease gun

Info

Publication number: US1840111A
Application number: US269223A
Authority: US
Inventors: Kreidel Hans
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-03-02
Filing date: 1928-04-11
Publication date: 1932-01-05
Anticipated expiration: 1949-01-05

Description

H. KREIDEL Jan. 5, 1932.

GREASE-GUN Filed April 11. 1928 lidera-.rented dan, 5, 1932 EAN S KREDEL, 0K4 WESBAIDEN, GERMANY GREASE GUN Application led April 1l., 1928, Serial No.

The present invention relates to a lubri eating gun having a suction and pressure piston adapted to be actuated by hand, the front portion of the gun being formed as ahigh pressure pump mechanism of which `the spring actuated Working and sliding cylinder guided in the bottom of the gun forms a coinmon outflow passage for the lubricant and in which the high pressure pump mechanism automatically comes into operation as soon as a higher resistance is opposed to the outflow ofI the lubricant and the outflow nozzle must be pressed more strongly upon the point to be lubricated, the entire lubricating gun now sliding forwardly on the working and sliding cylinder and the ejection pistonof the high pressure pump mechanism enters the cylinder. The lubricating gun maybe used as an ordinary lubricating gun and as a high pressure lubricating gun. ln the iirst method oi operation the complete charge of lubricant can be ejected successively in small quantities or also at one operation by means of the suction and pressure piston. ln the second method of operation, however, it is only possible to edect the ejection in separate quantities, under high pressure, which correspond to the amount by which the ejection piston .or the high pressure pump mechanism penetrates into the Working and sliding cylinder is preferably constructed Without valves so that by means thereof, when withdrawing the suction and pressure piston provided in the gun cylinder, the lubricant is also drawn from a supply container, the lubricating gun being thus capable oibeing lilled in a. simple manner. The Working and sliding cylinder and the ejection piston of the high pressure pump mechanism are under the action ci a single spring which forces them axially apart, this spring holding both the cylinder head against the bottom of the gun, and also pressing the perforated supporting plate or the supporting bar of the ejection piston on a shoulder or the gun cylinder in a manner as to be detachable and removable. The packing of the Working and sliding .cylinder in the bottom of the gun is edected by means of a packing disc tted over and bearing against' the latter, which disc is alternately exposed to the action aeazea, alla in Germany March a, 192e.

of the spring of the high pressure pump mechanism and the pressure of the lubricant. The accompanying drawings show an example of construction in accordance with the invention in longitudinal section,.in four different positions.

Figure l shows the lubricating gun in the position of rest, completely empty and with a protecting cap screwed over the Working and sliding cylinder and the nozzle.

Figure 2 shows the lubricating gun With the nozzle inserted in the supply of lubricant, Whilst the gun suction and pressure piston is drawn back and consequently has effected the :Filling of the gun. y

Figure 3 shows the lubricating gun When lubricating a ball bearing When no Jfriction is opposed, and Figure Ll shows the high pressure pump mechanism in operation for overcoming a resistance which is opposed to the outdow of the lubricant when lubricating a sliding bearing.

a indicates the gun cylinder for the receptionof the lubricant and provided with a bot.- tom b and a cover c. By means or a depression formed in the cylinder there is obtained an inwardly directed projection or shoulder d. Above this is located the suction and pressure piston e of the gun, of Which the piston rod f is passed through the cover c and outside is provided with a suitable hand-piece g. This suction and pressure piston e consists of tivo leather cups having the bottoms thereof pressed against one another or together by l means of a spring e1 bearing against a disc f1 secured to the end of the piston rod.

ln the front portion of the gun cylinder a there l is mounted the high pressure pump mechanism. This consists of ther valveless working and sliding cylinder it and the ejection piston t" between Which is located the compressible spring 7a which moves ath-em axially apart. The Working and slidirg cylinder 7l, is guided in the strengthen@dY portion of the gun bottom b and is provided with a separate .nozzle l for application to the point to be lubricated. lnstead of the nozzle shown any other suitable nozzle may be used.. @n

the Worlring and sliding cylinder i, there is.

ice

fitted a packing disc m el leather or the like which tightly surrounds it and bears loosely against the gun bottom b. The strengthened head 71,1 of the Working and sliding cylinder also bears against the gun bottom or the packing disc 'mplaced 'thereon and against the somewhat enlarged end thereof bears the compressible spreading spring ln the head of the Working and sliding cylinder L is secured a packing disc n oi' leather or the like which serves for packing the ejection piston relatively to the internal space oli' 'the 'working and sliding cylinder. The ejection piston t is secured to an annular disc 0 provided with passages 01, which disc 0 is constantly pressed against thc inner rib or shoulder [Z of' the gun cylinder a. The gun bottom is provided with an outwardly eX- tending screwed extension b1 on which there may be screwed, when the lubricating gun is not in use, a cap p for protecting the projecting part of the Working and sliding cylinder and the nozzle thereof. When the gun is to be used 'the cap is removed. When it is desired to fill the lubricating gun with lubricant the nozzle Zis dipped into the supply oit lubricant and the suction and pressure piston e is drawn back in the direction of the arrow. (Figure 2.) is this can only be moved as far as the rib or shoulder d air is contained in the iront portion of the lubricating gun cylinder, containing the high pressure pump mechanism, before the lubricating gun is used for the lirst time7 which air must be ejected by moving the suction and pressure piston to and fro a number of times. j

When all the air has been removed 'then on pulling back the suction and pressure piston lubricant is drawn in thus llorvingthrough the nozzle Z and the Working and sliding cylinder h and past the ejection piston i and finally through the openings o1 in the annular disc o to below the suction and pressure piston and filling the entire free space of the gun cylinderk a. li it is now desired to operate upon a point to be lubricated with the lubrieating gun which .is non7 ready for use and which point does not oppose any resistance to the lubricant, as is for example the case when lubricating and filling ball bearings, (Figure 3) and annular bearings or when filling lubricant containers of dillerent types7 as also when simply ejecting the lubricating material, as is the case with the usual lubrieating gun, slight pressure on the hand-piece g of the suction and pressure piston e, in the directicn of the arrow (Figure 3), suffices to cause the lubricant to flow out and flow into the point to be lubricated or into the container-in question.

As soon as any considerable re istance is ed to the lubricant at the point of leavnozzle, as is itor example the cn f eating sliding bearings (Fix ure a higher pressure must be exerted on the hand-piece g of the suction and pressure piston e. By means of the increased pressure thus exerted the lubricant is compressed in the gun cylinder and as soon` as the pressure exceeds the tension of the spring It the Whole gun moves over the Working and sliding cylinder It of the high pressure pump mechanism somewhat forwardly and the ejection piston thereof enters the cylinder ll. A portion olf the lubricant contents olf the cylinder corresponding with the depth of penetration of the piston?,l into the cylinder it is thus expelled or ejected under a high pressure. llfnis high pressure corresponds with the dili'erential ratio of the two pistons e and z' and overcomes the resistances which occur at the outlet rom the nozzle L vl/hen pressing the nozzle Z against the point to be lubricated a tight joint must be formed between the tWo parts which can be obtained in a suitable manner for example by suitable construction of the parts bearing upon one another' and the surfaces thereof as also by a suitable application pressure1 lThis tight oint, Which when pressing the lubricatin gun downwardly prevents the lubricant from escaping laterally also prevents during the return movement of the lubricating gun or' atmospheric air being drawn in as long as the nozzle remains seated on the lubricating hole. Consequently there is formed in the Working and sliding cylinder la Whilst the ejection piston i moves out of it under the action of the expanding spring it, a vacuum by means of which lubricant is drawn from the supply contained in the gun cylinder a at 'the moment at Whichithe free end of the ejection piston z' moves out of the working and sliding cylinder la. During the return movement of the lubricating gun on the Working and sliding cylinder L the nozzle Z is held pressed against the pointto be lubricated by the action of the compressed spring is. lhe suction of lubricant into the Working and sliding cylinder it from the supply contained in the gun cylinder during the relieving from pressure of the device is supported by the pressure v'of the suction and pressure piston e which is under the direct action of the hand and exerted directly on the lubricant before i and after the tensioning of the spring 75.

lll

lll)

pump mechanism can be moved from the front out of the gun cylinder.

I claim as my invention:

l. In a lubricating gun ofthe class described, a low pressure cylinder forming a container for lubricant, a piston reciprocable in said cylinder and making an air tight and lubricant tight seal therewith when moved in both directions, a high pressure cylinder 30 supplied from said low pressure cylinder, a A piston for discharging lubricant from said high pressure cylinder, means for connecting said high pressure cylinder in open communication with a part requiring lubrication, and a handle for moving said low pressure piston in one direction to cause said gun to discharge lubricant and for moving said loW pressure piston in a second direction to rell said gun with a new charge of lubricant 2o through the high pressure cylinder.

2. In lubricating apparatus of the class described, a low pressure cylinder forming a lubricant reservoir, a low pressure piston reciprocable in said cylinder, said low pressure piston including reversed cup leathers for eii'ecting an air and lubricant tight seal between said piston and cylinder when said piston is moved in either direction, a high pressure cylinder in communication with said "i0 low pressure cylinder, a piston for said high pressure cylinder, a nozzle attached to said high pressure cylinder-and providing an open outlet passageway therefor, and a handle for reciprocating the low pressurepiston to cause discharge of lubricant under low pressure when moved in one direction and to suck in lubricant through the high pressure cylinder into the low pressure cylinder when moved in the other direction. v

ec 3. In a lubricating gun of the class described, a low pressure cylinder ormingra container for lubricant, a piston reciprocable in said cylinder and making an air-tight and lubricant-tight seal therewith when moved in either direction, a high pressure cylinder in-'aXial alignment therewith and supplied from said low pressure cylinder, a piston for discharging lubricant from said high pressure cylinder, means for connecting said high pressure cylinder in open communication with a part requiring lubrication, and a handle for moving said low pressure piston in one direction to cause said gun to discharge lubricant and for moving said low pressure piston in an opposite direction to re-fill said gun with a new charge of lubricant through the high pressure cylinder.

In witness whereof I have hereunto set my hand.

G0 HANS KREIDEL.