PH26400A

PH26400A - Mechanical jack hammer

Info

Publication number: PH26400A
Application number: PH36983A
Authority: PH
Inventors: Benito C Lao
Original assignee: Benito C. Lao
Priority date: 1988-05-27
Filing date: 1988-05-27
Publication date: 1992-07-02

Description

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MECHANICAL JACK HAMMER kJ A 16 P3 ®

BACKGROUND OF THE INVENTION : Co

Heretofore, most of the conventional jack hammer used for construction purposes, particularly for soil and concrete works are of the pneumatic type. This type of jack hammer, in order to operate, requires a supply of large volumes of pressurized air and fluid. This means a huge compressor and means storing : and distributing fluid is needed as a part or a major component of the jack hammer. Furthermore, the use of either a diesel or gasoline engine is most of the time necessary to run the compressor or to function as a power source in remote areas.

Construction wise, conventional jack hammers of the o pneumatic type require the use of precision components. e.g. pneumatic cylinder, piston rods, gas reservoirs, hydraulic circuits and precision valves which in a long run will heavily add to the cost of maintenance following the occurence of mechanical failure. in view of the foregoing, one could conclude that the use and maintenance of a pneumatic jack hammer is costly. A practical drawback could be pointed out as regards to the availability of power source in remote areas and at the same time maintaining the different components of the jack hammer

GPhge from wear and tear. Moreover, air "compressors and supply lines for fluid and lubrication accompanying the pneumatic jack hammers could be a hazard to health due to gu bes arising plug from exhaust air from the major components.

The present invention features a mechanical jack hammer consisting of two moving parts and though manually operated, is . —-2— } ye portable and as efficient as pneumatic type jack hammer, and specially adaptable in remote and rural area.

SUMMARY OF THE INVENTION

The present invention for a mechanical jack hammer comprises a main tubular body having a metal ring fixedly secured on the upper opening portion thereof, a metal sleeve fixedly secured at the lower portion thereof, both main tubular . body and sleeve are provided each with oppositely disposed and aligned holes, a cylindrical plunger having a head portion and a metal ring welded around said plunger proximate the bottom portion thereof, and a hammer tool in the form of a tool bit or a wedge type bit detachably secured at the lower portion of said tubular body. Said hammer tool is secured to said tubular body by means of a cylindrical sleeve having a central annular groove and slidably fitted on the upper section of said hammer tool. ~ Said annular groove is locked by means of a bolt and nut passing through the holes provided for in the sleeve and main tubular body. The present invention also provides different types of hammer tool attachments depending on the purpose or type of soil or concrete work to be done. This provision includes a circular or rectangular compact base and is effective for soil compacting purposes.

The present invention aims to eliminate the difficulties and drawbacks of the conventional jack hammer by introducing a simple mechanical jack hammer suitable in the construction of roads, buildings. mining works, irrigation canals, stone crushing and other soil/ground breaking works.

Another object of the invention is to cut-off use and maintenance expenses during operation by introducing a . mechanical jack hammer which is simple in construction, easy to maintain and yet efficient in performance. : 5 . BRIEF DESCRIPTION OF THE DRAWINGS: ’ FIGURE 1 is a perspective view of my new invention for a mechanical jack hammer:

FIGURE 2 is a cross sectional view taken along line 2-2 of

Figure 1;

FIGURE 2a is a sectional view showing the hammer tool in its lowest position:

FIGURE 3 is a partial view of the upper portion of the hammer tool:

FIGURE 3a is a perspective of a wedge type bit;

FIGURE 3b is a cut-away view of the lower portion of the another embodiment of the manner tool;

FIGURE 3c is a perspective view of the circular compact base;

FIGURE 3d is a perspective view showing another embodiment of the compact base; and

FIGURE 4 is a partial exploded view of the mechanical jack hammer.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to the drawings in detail, Figures 1 and 2 show an embodiment of the present invention for a mechapjcal jack hammer 1 comprising a main tubular body 4. a cylindrical plunger 2, and a hammer tool 7 detachably secured at the lower portion of said main tubular body. Since the mechanical jack jack hammer of the present invention is designed for heavy soil and concrete works, high carbon steel will be use as the main material in manufacturing the different components of the jack hammer. } 5 The main tubular body 4 as shown in Figures 1 and 2 is provided with a metal ring 4a at the upper opening portion , thereof. (A steel pipe could be used for the main tubular body of the jack hammer.) Said metal ring 4a is fixedly secured by welding the same on the upper opening portion of said tubular body. The metal ring 4a serves as a centering guide and at the same time. as a stopper for the moving cylindrical plunger 2.

Said cylindrical plunger 2 having a smaller diameter than the main tubular body is slidably fitted on said tubular body and is provided with a metal ring 2a welded around said plunger proximate the bottom portion thereof. Said metal ring 2a serves as an internal centering guide and as stopper during the displacement operation of the plunger. Plunger 2 is further provided with a head portion 3 preferably of cylindrical cross section and made from heavy metal or steel to serve the purpose of adding weight to the plunger and increase the ramming load or force.

At the lower portion of the main tubular body, as shown in

Figures 1, 2 and 4, metal sleeve 5 is fixedly secured thereon to reinforce said tubular body in absorbing shocks coming from the impact of vibration produced in the hammer tool and transfered phage to the different components of the jack hammer during operation.

Said tubular body and sleeve are each provided with holes 5a and are aligned to receive bolt and nut 5b to lock the hammer tool at the lower portion of the tubular body.

The hammer tool 7 as shown in Figure 2 of lesser diameter that the main tubular body 4 is a generally cylindrical elongated body consisting of a head portion 7a, a spike portion 7b disposed at the lower portion of said elongated body: a cylindrical sleeve 7c slidably fitted at the upper section of said hammer tool. A circular plate 7e is centrally inserted into said elongated body and fixedly secured at the middle section thereof. Said circular plate 7e is preferably welded unto the elongated body of hammer tool 7. Cylindrical sleeve 7c is provided at the middle portion thereof with an annular groove 7d. This annular groove is adapted to be detachably secured in the lower portion of the main tubular body. A pair of bolt and nut 5b is received through aligned holes 5a provided in the tubular body and sleeve and locks the cylindrical sleeve 7c through annular grooves 7d. This eventually secures the upper part of the hammer tool inside the main tubular body. This locks the hammer tool to the tubular tube since the cylindrical sleeve 7c will remain in the locked position while the upper part of hammer tool 7 is vertically displaced during operation.

Figure 2 and 2a show how the hammer tool is displaced. Upon impact of the plunger 2 and the head portion 7a of the hammer tool at point P, the upper part of the hammer tool will slide down until the lower surface of head portion 7a is in contact with the upper surface of cylindrical sleeve 7¢ at point "O" o (see Fig. 2a). The cylindrical sleeve’ 7c is adapted to slide in the upper section of the hammer tool since circular plate 7e

: fixedly secured at the middle section of the hammer tool will also serve as a stopper for said cylindrical sleeve.

In another embodiment of the invention, the hammer tool instead of a spike formed at the lower section, said portion is made cylindrical as shown by portion 7f in Fig. 3B. This portion is provided with a hole 7g and is detachably secured to a compact base 8 or 9 as shown in Figs. 3c and 3D.

The Compact Basdoould either be circular or rectangular in cross section. Both types consist of a plate (Ba, 9a), a platform (8b, 9b) centrally disposed on said plate, and a pair of vertical walls 10 oppositely disposed on said platform defining a central channel adapted to receive portion 7f of the hammer tool. Portion 7f is detachably secured by a bolt and nut received through holes provided on said pair of vertical walls and hole 7g provided on portion 7f. Said vertical walls are each provided on the sides thereof with triangular supports 10a : angularly disposed thereto.

Also, in another embodiment of the invention a wedge 11 is formed at the lower section of the hammer tool in lieu of the spike or portion 7a as shown in Fig. 3A.

To operate the mechanical jack hammer, the upper part of : : the hammer tool is inserted inside the main tubular body at the lower portion thereof, and detachably secured at the cylindrical sleeve 7c by means of a bolt and nut received through the aligned holes provided on the sleeve 5 and the main tubular body 4 and to the annular groove 7d of the cylindrical sleeve. Said . sleeve serves as a stopper for the hammer tool as the upper section of said hammer tool is vertically displaced by the plunger. fy y —

A pair of generally U-shaped handles 6 is provided along the length of said main tubular body.

Since the hammer tool and plunger are both movable parts, the vibration coming from the impact generated at the points P, 0, and lower part of the hammer tool will be evenly distribuated through the body thereby breakage of specific components is prevented,

The foregoing description and drawings are illustrative but are not to be taken as limiting. Other variations and modifications are possible without departing from from the spirit and scope of the present invention.

Claims

CLAIMS: ' ‘

1. A mechanical jack hammer comprising: a main tubular body consisting of a ring fixedly secured on the upper opening portion thereof, a sleeve fixedly secured on the lower portion thereof, said tubular body and sleeve are each provided with a pair of oppositely disposed and aligned holes, and a pair of generally U-shaped handles disposed along the length of said tubular body: a cylindrical plunger consisting of a head portion, a ring fixedly secured around said plunger proximate the bottom portion thereof, said plunger being adapted to be slidably fitted on said main tubular body; and a hammer tool having a generally cylindrical elongated body consisting of a head portion and a spike portion disposed at the lower section thereof, a cylindrical sleeve slidably fitted on the upper section of said elongated body. said cylindrical sleeve being provided with an annular groove centrally disposed thereon, and a circular plate fixedly secured at the middle portion of said elongated body. said cylindrical sleeve being adapted to be detachably secured inside the lower portion of said main tubular body by locking said annular groove with a pair of bolt and nut provided on the aligned holes of said main tubular body and sleeve, and said circular plate being adapted to hold said slidable 2 cylindrical sleeve within the upper section of said elongated y body.

‘

2. A mechanical jack hammer in accordance with claim 1 -Q-

wherein said hammer tool having a generally cylindrical elongated body being provided with a compact base portion at the : lower section thereof.

3. A mechanical jack hammer in accordance with claim 2 wherein said compact base portion consists of a circular base plate, a circular platform centrally disposed thereon: a pair of vertical walls oppositely disposed on said platform thereby rg defininga oan channel, said vertical walls being provided . with triangular supports angularly disposed on the side$ hago thereof, said central channel being adapted to receive the lower section of said hammer tool. and said hammer tool being adapted to be detachably secured on said compact base.

4. A mechanical jack hammer in accordance with claim 3 wherein said compact base is rectangular in cross section. EE BENT C. LAO Inventor ® -10 i