US1279481A - Lifting-truck. - Google Patents

Description

fm v

W. STUEBING, 1R..

-LIFIING TRUCK.

APPLICATION FILED APR. I2` I9I.

,279548 l Patwed Sept. 1T, ISHS.

www@

1 tension when the Jr., a citizen of the United vsired to lower the locking parts l check mechanism, and

`innrra.n erariale regresa erntet 'WILLIAM STUEBING, 3R., OF CINCINNATI, OHIO, ASSIGNOR TO THE STUEBING TRUCK COMPANY, OF CINCINNATI, OHIO, A. CORPORATION OF OHIO.

:ferme-TRUCK.

Specicaton of Letters Patent.

Patented Sept., 1*?, 1913.

Application filed April 12, 1916. .Serial No.'90,756.

To all w hom t may concer/n:

Be it lznown that I, WILLIAM S'r'UnisiNc, States, residing at the cityv of Cincinnati, in the county of Ilaiiiilton and State of Ohio, have invented certain new and useful Improvements in Lifting-'I`rucks, of which the following is a specification.

My invention relates to check mechanism used in connection with lifting trucks, which check aiu-,l govern the downward movement of the lifting platform of such lifting trucks,

keeping the same from falling suddenly or with a thud gand it relates more particularly te means connected with said check mecha- `nism so that the elevating platforin'can he pulled down into normal position when it is empty and unloaded.

r1`he lifting platform, when raised, is usually locked in position, so that the load can he moved to any point, and when it is dethe loaded lifting` platform, are released, and the fluid check-will allow the load to gradually fall with the elevating platform, to normal position. f

`When the lifting` platform is not loaded or empty and is in'an elevated position, and it is desired to lower thel same, itis first unlocked from its elevated position and the operator presses on said lifting platform with his foot or stands thereon in order to start it on its downward course; I overcome this hy a spring I use in connection with my check. vmechanism which is placed at a lifting platform is elevated and when released the tension of the spring pulls down said platform.V

In the accompanying drawing, part of this specification.

Figure 1, is i plan view of forming the liftiii g truck,

Fig. 2, is a side view, the elevating platform being raised,

Fig. 3, is a similar view with the elevating platform partly lowered,

Fig. 4, is a longitudinal section of the Fig. 5, is Fig. 4.

The truck is formed of a lower 'frame consisting of 'a front head 1, two rearwardly extending connecting hars 2 connected to across-section on line 55 of 'connect a spring 27.

part beingin full lines,v

the pawl 30, and lextending forward the back axle 3 and connected in the front with the head 1 through the pins 1 and 5. This lifting'or elevating platform of the truck consists of two links 6, fulcrumed on the shaft 3 and carrying at their other hear ing ends the shaft 7, see Fig. 1. To the shaft T I connect on both sides the link bars 8, extending forward to the front of the truck and connected through the pins 9 to the links v10. The links 10 in turn are connected through pins .4 to the. front head. I l

In the front head 1, I carry the bearing 12 and through this bearing I operate the fork 13 carrying at its bottoni end the bear inUs.15-15, and through these bearings I a shaft 16 and on said shaft I place the two front wheels 1T on the outside of the fork 13, the shaft 16 making a hearing for the said wheels. On the shaft 3 I place the rear wheels 18, thus constructing a four wheeled device.

The fork 13 with its bearing 19 operating in bearing 12 will allow the two front wheels 17 Ato swivel as in the manner of wagons.

The fork 13 is constructed with a flange 4.0, which flange. acts as a thrust hearing against the face\ of the bearing 12 on head 1 thus supporting, through the agency of the wheels 17 and forl 13, the head 1.

At the other end of fork 13, I carry the two bearings 20-20, through these bearin gs I place the shaft 21 in such a position as to lock the fork 13 between lower face .of nearing 12 in the head 1. Iiv

otally connected on shaft 21 and operating between the bearings 20-20 of fork 13, I connect the handle, lever or tongue 22.

At the lower end of the handle 22 I provide the bearing point 23, to which I connect the hook 24 through pin 25. Entending away from hearing 23 is a short arm' 26. Between the tongue 22 and the hookv 2a, I The short arin 26 acts as a stop for hook 24 limiting its travel, when the spring 27 operates hook hack into its normal position, which operation will be hereinafter described.

On the top of the head 1, I-place the bean ing 28 carrying a pin 29, which pin supports pawl, I provide the treadle 31; the twc ha ing made integral and operate on .the pin 29 as a pivotal point.

to pull said on the g the upper and To the pawl 30 l connect the spring 32 -which at its other end is fastened to front head l at point 33. i

@n the elevating platform l connect the bridge 3l extending across the platform and connecting at each side with link bars Sw, and en the bridge, at its front l place an engaging hoolr 35 for the hook 24 and another engaging hooli; 36 for the pawl 30.

At the rear the bridge 3l is provided with a raised abutment 37 which limits the forward movement of the platform upon which the articles to be lifted are placed; these platformsare usually made of wood and are raised so that the truck can be placed under them when down in order to elevate the same.

lo operate the truck when the elevating platform in its lowest position, the operator forces the hook 24 down into engagement with the hook 35 on bridge 34, as shown in lliig. 2, the handle is then pulled into a horizontal position forcin r the link bars 8 which are connected to the bridge 34, to elevate on the links 10 and allow the pawl 30 to engage with the hook 36 on bridge 34, thus locking the elevated platform with its load, and to disengage the hook 24 the operator again raises handle 22 and this forces the hook .fl rearwardly, until it passes out of contact with the hook 35, and then, through the spring 2? the hook 24 is .quickly and automatically pulled up into normal position against stop 26, sce Fig. 5; the spring 27 having heen placed at tension when the hook 24 was rst placed into engagement with the hook 35.

After the platform is raised and locked into position and the hook 24 has automatically been released from hook 35, the tongue or lever 22 is then free to turn in a complete circle laterally, thus allowing the fork 13 which carries the two front wheels 17 to turn in all directions. l/V hen the elevating platforn'l is down the handle, and frontjw'eels can also be moved laterally and in 'a'.Y circle the saine as when the platform is elevated; thus it will be seen that the handle and wheels are free to turn in all directions when the platform is down or up,

lin order to lower the elevating platform aft-er it has been elevated, the operator steps on treadle part 31 of pawl 30, thus disconnecting pawl 30 from hook 36, allowing the platform to desceml.

. l will now describe my fluid check and its operation. ln order to carry out my invention, l attach, to the cross-bar 38, on the lower frame part 2, two dii/'erging liars 50Min), which at their forward ends are attached to the side links 2-2. 'To said cross bar 38, ll attach a fork 5l and in this fork l fulcrum the rear end 52 of the check, through niediinn hfpin 53. To the rear end 52 of the check l attach the cylinder 54 of said check nera/iai.

and into this cylinder passes the piston` rod Un the piston rod, at its real', latach a piston or piston head 56. rl`he pistonicarries a washer or piston ring 57 to keep 1t tight against the insidewall of the cylinder.

At one end of the piston I place a valve 58, held against the piston` by spring 59, which spring is held in place by a washer held by pin 61. llhroagli the piston l place the passage ways or elongated slots 62, in the present instance using three. Through the valve 58, I place aby-pass 63, throughwhlch oil can pass into an annular recess 64 in the piston into the space 71 in cylinder in front of the piston, when the loaded or unloaded elevating platform is lowered.

At its forward end the cylinder 54 is closed by a cap .or head 65, into which is placed a stuffing box 66, and a stuli'er 67. The piston rod 55 is pivotally attached toa forked part 68, which in turn is connected to short arm 69, made integral with the bridge 3l of the lifting or elevating platform.

Around the piston rod 55 and between the piston 56 and the part or head 65, I place a coiled spring 70.

lt will readily he apparent that when the elevating or lifting platform, with the load, is elevated, as above set forth in the operation of the truck itself, the upward and forward movement, by reason of piston rod 55 heilig connected as described to bridge 34 on the elevating platform, will follow the operation of said lifting platform and move upward and forward therewith; thus pulling out said piston rod 55 and piston 56 and connections, and thus place a tension on the spring 70, the oil in space Z 1, during this opveration being forced through the elongated slots 62 in the piston 56 into the space 72 back of the piston; the force lifting valve 58 oil its seat and when the lifting operation is complete, the spring 59 forces valve 58 again against the piston 56 and as long as the platform remains elevated, the parts will remain in this position, but, as soon as the elevating platform is released, the oil in the space 72 in rear of the piston which has passed there during the liftin operation, will slowly run or seep throng luy-pass 63 into the annular recess 64 in the piston, into space 7l forward of the piston 56, this opera'- tion continues until the oil has passed into said space Z1 forward of the piston 56, Vby this tune the lifting platform is down in position again. A

This fluid check will operatel perfectly when a load is on the lifting or elevatin i platform and the locking means are release and various forms of fluid checks have been used for this purpose, but when the platn form is in an elevated position and locked, without a load, it has been necessary when the locking mechanism has been released to give the elevating platform an initial down- Iso ward movement by some manual means, as for instance, by standing on the platform or pushing downward upon it; but with my spring which is placed at a tension when the elevating platform has been pulled up or lifted, will by itself pull down the lifting platform without the interposition of manf ual means, and this is one of the features 'of my invention.

It will be understood that this check and a tension device may be used by me in connection with any form of lifting truck and it will also be evidentthat the same is capable of some modification, and I- do'not Wish to limit myself to the precise construction herein shown and described.l

lVbat I claim as new and my invention and-desire to secure by Letters Patent, s:

l. In a lifting truck, a frame, a platform elevatable with respect to said frame, means to hold said platform in elevated position,l a fluid check device connected to said frame and platform, and a spring carried by said check device, said spring being arranged to be stressed by. said check device when the platform is elevated Vwhereby upon the release of said platform from its holding means an initial downward impetus is given said platform b v said spring.

2. ln a lifting truck, a frame, a platform elevatable with respect to said frame, means to bold said platform in elevated position, a fluid check device connected to said frame, and platform, a spring carried by said check device, said spring being arranged to be elevatable with respect to said frame, means to hold said platform in elevated position, a

fluid check device connected to said frame and platform, a spring, said spring operating in connection with said Huid check and arranged to be placed under strain when the platform is elevated, whereby upon the re lease ofv said platform from lts holding means'an initial downward impetus is given i said platform by said spring.

4. In a lifting truck, a frame, a platform elevatable with respect to said frame, means to hold said platform in elevated position, a iiuid check device connected to said frame and platform, a spring, said spring arranged to be placed under strain when the platform is elevated, whereby upon the release of said platform from its holding means an initial downward impetus is given said platform by said spring.

Signed at Cincinnati, Hamilton county, Ohio, this 25th day of January, 1916.

wiLLrAM STUEBING, JR.

lVitnesses 4 JOHN WV. STREHLI,

L. DUNLAR.

Images