CA2064702A1 - Pump jack pole - Google Patents
Pump jack poleInfo
- Publication number
- CA2064702A1 CA2064702A1 CA 2064702 CA2064702A CA2064702A1 CA 2064702 A1 CA2064702 A1 CA 2064702A1 CA 2064702 CA2064702 CA 2064702 CA 2064702 A CA2064702 A CA 2064702A CA 2064702 A1 CA2064702 A1 CA 2064702A1
- Authority
- CA
- Canada
- Prior art keywords
- pole
- pump jack
- tubing
- facing strip
- strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/18—Scaffolds primarily resting on the ground adjustable in height
- E04G1/20—Scaffolds comprising upright members and provision for supporting cross-members or platforms at different positions therealong
Abstract
A pump jack pole (62) is comprised of an elongated metal tube (32) of rectangular configuration and a resiliently yieldable elastomeric strip (34) which is secured to one side of the tubing. The tubing (32) is comprised of an aluminum extrusion whereon there is formed a plurality of longitudinally extending closely-spaced parallel protrusions (40). The strip (34) is formed with a plurality of similarly spaced longitudinally extending grooves (50) of complementary configuration to the protrusions (40) which are interdigitated with the grooves (50).
Description
2~7~2 PC~s9(~
PUMP JACR POLE
~3ACKGROUND OF TH}~ INYENTION
The present invention relates to scaffolding ... .
equipment in general, and more particularly to upright poles util.ized with pump jacks traveling up and down thereupon.
It has been customary in various industries, for example, while working on exteriors of houses, to erect scaffolding in order to permit workers to stand at an elevation above ground surface. Typically, scaffolding systems are utilized in installations o~ aluminum or vinyl siding. Such scaffolding svstems utilize~pu~p jack poles which are laterally spaced from each other and secured to the house by a brace. Pump jacks, which include support arms for supporting a scaffolding staging, and also include .
shackles which clamp onto the upright poles, are used to travel up and down the poles. Workers stand on the~ '' scaffolding staging and operate the pump jack by means of a foot pump to thereby~move the staging up and down along the upright poles.
An improved pole used for pump jacks is'described in my U.S. Patent No.~~4,382,488. Such poles.are formed,of metal tubing and hav a rubberiæed surface provided on.:one . '~';, , :
: ':
,. . .
.
. ~ :
WO 91/03612 ~ lj 4 r~ S(3(~ 143 side of the metal pole. The metal pole is preferably of rectangular cross-section and the rubberized material is secured to the face of the metal poles by adhesive and/or rivets. Securement of the rubberized material to the metal wall of the tubular pole must be rel:iable to support the weight of a worker when he stands on the staging with the shackles of the pump ~ack gripping the pole. In the aforementioned patent, it was shown that although the shackles of the pump jack clamps the pole on two opposing sides, only one of these need be covered by rubber to still provide adequate gripp.ing of the pole and support the weight of workers on the scaffolding staging.
Due to substantial transmittal forces acting on the rubberized material when the worker's weight is applied to the staging, the adhesive connection between the rubberized strip and the metal pole must be secure. Using rivets in addition to the adhesive connection between the rubberized material and the metal wall of the pole improves the connection between the rubber and the metal pole.
However, using rivets increases labor costs as well as material expenses in producing pump jack poles.
Furthermore, should a submerged surface become damaged, it is not feasible to replace the rubberized section without the need for expensive equipment, time and cost.
Accordingly, there has been need to provide a secure connection batween the rubberized surface and the metal pole and yet provide such securement with less expensive means than that of the prior art poles.
, ;~
8UMM~.RY OF q~IE INVENTIQN
, - It is an object of the present invention to provide an improved pump jack pole of the type under ;
discussion. - -. '~
':
~, , i. ., ~ .
2~6~7~2 WO91/03S12 PCr/US90/0~
It is another object of the present invention toprovide a pump jack pole in which a resiliently yieldable elastomeric surface or strip is reliably secured to the exteriGr side of the metal tubing of the pole by the means provided on the strip and the tubing themselves, without requiring the use of any adhesive or additional fasteners for connecting them to each other.
In brief, there is provided a pump jack pole which comprises an elongated metal tubing and a resiliently yieldable elastomeric strip which faces the metal tubing and is secured to the exterior side thereof. The tubing is formed with a plurality of longitudinally extending closely spaced parallel ribs, whereas the elastomeric strip is formed with a plurality of similarly spaced longitudinally extending grooves of complementary configuration to the ribs. The ribs and the grooves are interdigitated with one another so as to provide a secure connection between the strip and the metal tubing of the pole as the strip is pressed onto the tu~ing.
In an embodimsnt, each of the ribs has a head portion of generally semi-cylindrical configuration and integrally connected to the side of the tubing by means of a comparatively narrow neck portion. The corresponding shaped grooves include a pair of arms which matingly grasp either side of the neck to rigidly secure the elastomeric surface in place.
The resiliently yieldable elastomeric matexial can be a rubberized material such as rubberized belting or the like, or a polyurethane or the like. Hereinafter, the invention will be described in more detail utilizing rubberized material by way of example. However, it should be understood that other elastomeric material are:.included.
Ths aforementioned objects1 features and advantages of the invention will, in part, be pointed out .. . . .
' ' , . : ' : ': .
WO9l/036l2 2 0 fi ~ 7 ~ 2 ` PC~/~S90/04l43 with particularity, and will, in part, become obvious fro~n the following more detailed descript:ion of the invention, taken in conjunction with the accompanying drawing which ~orms an integral part thereof.
BRIEF D~8CRIPTION OF '~HE DR~WING
In the drawing:
Fig. 1 is a perspective view of the pump jack pole of the present invention utilized as part of a scaffolding arrangement;
Fig. 2 i5 a perspective sectional view of a part of the pump jack pole according to the present invention;
Fig. 3 is an exploded perspective view of the metal tubing and a rubberized strip of a section of the pu~p jack pole of Fig. 2;
Fig. 4 is a perspective view of the pump jack poie s~ction with a joint portion of the rubberized strip extended beyond the pole section;
Fig. 5 is a cross-sectional view taken along line 5-5 of Fig. 4;
Fig. 6 is a detail 6 of Fig. 5, on an enlarged scale; and Fig. 7 is a perspective view of two adjacent pump jack pole sections joined together.
DETAILED D~SCRIPTION OF ~HE P~EFERRED_EMBODI~
Referring now to FigO 1, there are shown three pump jacks depicted generally at 10, 12 and 14. Such pump jacks aan be of a t:ype described in my U.S. Patent Nos.
4,413,828 or 4,597,471. Each pump jack i.s adapted to ride on an upright pole 16, 18 and 20, respectively and suppoxt a lover staging platform 22 and an upper shelf 24. The WO91/03612 1'C~/lSI)(J/()~
2 ~ 2 scaffolding is located as shown adjacent a building 26 on which a workman ~8 is operating. The poles are retained in place by means of braces 23 of a type described in my U.S.
Patent No. 4,446,945 and a cla~p 25 oi a type described in my U.S. Patent No. 4,432,435. The scaffolding can be used for various types of work on houses and buildings, for example placing aluminum or vinyl sid:ing on the house walls, painting, etc.
Referring now to Figs. 2 and 3, there is shown a pump jack pole 30 according to thé present inv~ntion, which ~omprises an elongated metal tubinq 32 of a substantially rectangular cross section to which is connected a rubberized strip or band 34. The latter is attached to only one side of the metal tubiny 32 and is interconnected wi.th the same by means which will be explained in detail below. All the aforementioned poles 16, 18 and 20 of the scaffolding arrangement of Fig. l are formed in the same manner as the pole 30.
As is known, while the pump jack is riding up and down the metal pole 30 it grabs into the rubber strip 34.
Therefore, serious consideration has been given for providing means which would ensure sufficient security for tightly holding the pump jack on the pole. It has been found that the pump jack satisfactorily operated when only a single side of the metal pole is coated with the rubberized surface so that the pump jack would bite into the rubberized surface and grab the same as it moves up and down. Metal tubing 32 may be formed of aluminum extrusion of a substantially rectangular configuration.
As best seen in Fig. 3 as well as in Figs. 5 and 6, the side of ~he metal tubing 32 to which rubber strip or band 34 is attached, is formed with a plurality of parallel outwardly extending elon~ated protrusions or ribs 40 each having a rounded enlarged head portion 42 of substantially ~-'091/03612 1'Cr/~;S9()/i)~
2~7~2 6 semi-cylindrical configuration and c~ connesting or neck portion 44 which connects head portion 42 with a faciny wall 46 of the aluminum tubing 32. Head portion 42 of each rib may typically be about .250" in dia~leter and about 0.l72" in height whereas the neck portion may be about .125" in width and about 0.78" in height for the tubing side wall being about 2 /8" wide. The spacing between the ribs or protrusions 40 formed on the facing wall 46 of the tubing may be about .625" for the aforementioned wall width. All these dimensions would be with normal tolerances. The strip 34 of rubber is formed with a plurality of parallel complementarily-configured elongatPd grooves or recesses 50 each having, respectively, an enlarged portion 52 which receives the head portion~42 and a narrow portion 54 formed by two opposing inwardly extending arms 56, 58 which face each other to engage and grasp therebetween the neck portion 44 of the respective rib 40.
Strip 34 which may be made of any suitable resilient elastomeric material is simply pressed onto the facing wall of the aluminum tubing 32 of the pole whereby the ribs 40 and recesses 50 are interdiyitated with each other thus providing a reliable and secure connection between the pole tubing 32 and strip 34. As the strip 34 is pressed onto the pole facin~ wall, the two opposite arms 56, 58 of each groove or recess tightly clamp around the neck portion 44 of each rib with some slight spacing allowed around the head portion 42 of each rib. The rubber strip 34 may be made of a rubberized belting material. In any event, the rubber strip is easy and relatively inexpensive to make from a continual band which is cut to desired lengths.
Although it is possi.ble to add a rivet 60 at the top and the bottom of each pole section (Fig. 7) as an extra precaution in order to prevent sliding between the rubber and the metal pole, such rivets are not a necessity and the interengayed - "
,, . , . , , , .
~091/03612 2 ~ ~ ~ 7 ~ 2 ~cr/~is~o/() ~
ribs and complementary receiving grooves or recesses provided on the two facing walls of the metal tubing and -the strip are sufficient to support the weight of an individual operating the pump jack as shown in F.ig. l. No adhesive is necessary between the rubberized stri]? and the metal pole tubin~.
It should be appreciated that opposing arms 56 and 58 formed at each groove 50 act on the neck portion 44 of each rib e~gaged therebetween in a transversal direction.
In this way sliding in the vertical direction of the rubber 34 relative to the metal pole 32, which can be caused by the worker's weight, is totally prevented even without utilization of rivets or any other fasteners. Furthermore, the rubber does.not peel off the pole~ This is a rather surprising result since the entire weight of the workers must be held by the rubber and its interconnection to the pole. It would have been thought that the weight of the worker would either cause the rubber to slide down the pole or peel off the pole. However, with the gripping of this interdigitated relationship, the rubber remains in place and supports the weight of the workers.
Figs. 3 and 4 illustrate one pole section 62 of the pump jack pole whereas Fig. 7 shows a ~oint 63 of two interconnected pole sections 62 and 64. As shown in the drawings, the pole section 62 is formed as a male portion having a rubberized surface 66 which extends past the end 70 of the pole 62 to provide a flap 72. The other pole section .
64 similarly contains a rubberized surface 74. This rubberized surface 74 represents the female end and terminates in spaced relationship from the end 76 of the pole 64. In fact, each pole i5 formed with a male and female end.
When the two pole sections 62, 64 are connected, t~e exposed flap 72 of pole 62 will overlie and can be .
~091/03612 PCr/1S~0/()~
2~7~
s pressed on-to the female end 74 of the adjacent pole 64.
This will cause tne flap 7~ to interlock with the corresponding V-shaped edge 77 of the rubberized surface 74 along a joint line 78. In order to provide a suitable joint at the rubberiæed surface, the jolning edyes are matingly beveled so that they will interfit with each other. The grooves of the flap 72 will be pressed onto the exposed ribs at the end 77 of the adjacent end. This will provide a smooth and planar rubber face even at the junctions. To provide structural support at the junction, a joint can be inserted interiorly of the poles as described in my U.S.
Patent No. 4,382,488.
In order to provide for a suitable interfitting of the mating edges of the rubberized surfaces, the ends can be cut at a suitable an~le. The joint edge 78 is shown in an inverted V-shaped cut. This will permit suitable interfitting of the two edges to provide a smooth joint thereacross. When ~lap 72 fits into the inverted V-shaped cut of the female rubberized strip 74 all the ribs or tongues outwardly protruding from the wall of the metal pole 32 will be overlapped by the flap 72 of the male section.
It is understood, however, that other types of angular cuts can be utilized~ such as, for example, a diagonal cut completely crossing laterally the rubberized sur~ace. Other interfitting mating joints can simply be utilized.
There has been disclosed heretofore the best embodiment of the invention presently contemplated.
However, it is to be understood that various changes and modifications may be made thereto without departing from the spirit of the invention.
.,, .,, ~
...... ....... . . .. . . .
., ' , '
PUMP JACR POLE
~3ACKGROUND OF TH}~ INYENTION
The present invention relates to scaffolding ... .
equipment in general, and more particularly to upright poles util.ized with pump jacks traveling up and down thereupon.
It has been customary in various industries, for example, while working on exteriors of houses, to erect scaffolding in order to permit workers to stand at an elevation above ground surface. Typically, scaffolding systems are utilized in installations o~ aluminum or vinyl siding. Such scaffolding svstems utilize~pu~p jack poles which are laterally spaced from each other and secured to the house by a brace. Pump jacks, which include support arms for supporting a scaffolding staging, and also include .
shackles which clamp onto the upright poles, are used to travel up and down the poles. Workers stand on the~ '' scaffolding staging and operate the pump jack by means of a foot pump to thereby~move the staging up and down along the upright poles.
An improved pole used for pump jacks is'described in my U.S. Patent No.~~4,382,488. Such poles.are formed,of metal tubing and hav a rubberiæed surface provided on.:one . '~';, , :
: ':
,. . .
.
. ~ :
WO 91/03612 ~ lj 4 r~ S(3(~ 143 side of the metal pole. The metal pole is preferably of rectangular cross-section and the rubberized material is secured to the face of the metal poles by adhesive and/or rivets. Securement of the rubberized material to the metal wall of the tubular pole must be rel:iable to support the weight of a worker when he stands on the staging with the shackles of the pump ~ack gripping the pole. In the aforementioned patent, it was shown that although the shackles of the pump jack clamps the pole on two opposing sides, only one of these need be covered by rubber to still provide adequate gripp.ing of the pole and support the weight of workers on the scaffolding staging.
Due to substantial transmittal forces acting on the rubberized material when the worker's weight is applied to the staging, the adhesive connection between the rubberized strip and the metal pole must be secure. Using rivets in addition to the adhesive connection between the rubberized material and the metal wall of the pole improves the connection between the rubber and the metal pole.
However, using rivets increases labor costs as well as material expenses in producing pump jack poles.
Furthermore, should a submerged surface become damaged, it is not feasible to replace the rubberized section without the need for expensive equipment, time and cost.
Accordingly, there has been need to provide a secure connection batween the rubberized surface and the metal pole and yet provide such securement with less expensive means than that of the prior art poles.
, ;~
8UMM~.RY OF q~IE INVENTIQN
, - It is an object of the present invention to provide an improved pump jack pole of the type under ;
discussion. - -. '~
':
~, , i. ., ~ .
2~6~7~2 WO91/03S12 PCr/US90/0~
It is another object of the present invention toprovide a pump jack pole in which a resiliently yieldable elastomeric surface or strip is reliably secured to the exteriGr side of the metal tubing of the pole by the means provided on the strip and the tubing themselves, without requiring the use of any adhesive or additional fasteners for connecting them to each other.
In brief, there is provided a pump jack pole which comprises an elongated metal tubing and a resiliently yieldable elastomeric strip which faces the metal tubing and is secured to the exterior side thereof. The tubing is formed with a plurality of longitudinally extending closely spaced parallel ribs, whereas the elastomeric strip is formed with a plurality of similarly spaced longitudinally extending grooves of complementary configuration to the ribs. The ribs and the grooves are interdigitated with one another so as to provide a secure connection between the strip and the metal tubing of the pole as the strip is pressed onto the tu~ing.
In an embodimsnt, each of the ribs has a head portion of generally semi-cylindrical configuration and integrally connected to the side of the tubing by means of a comparatively narrow neck portion. The corresponding shaped grooves include a pair of arms which matingly grasp either side of the neck to rigidly secure the elastomeric surface in place.
The resiliently yieldable elastomeric matexial can be a rubberized material such as rubberized belting or the like, or a polyurethane or the like. Hereinafter, the invention will be described in more detail utilizing rubberized material by way of example. However, it should be understood that other elastomeric material are:.included.
Ths aforementioned objects1 features and advantages of the invention will, in part, be pointed out .. . . .
' ' , . : ' : ': .
WO9l/036l2 2 0 fi ~ 7 ~ 2 ` PC~/~S90/04l43 with particularity, and will, in part, become obvious fro~n the following more detailed descript:ion of the invention, taken in conjunction with the accompanying drawing which ~orms an integral part thereof.
BRIEF D~8CRIPTION OF '~HE DR~WING
In the drawing:
Fig. 1 is a perspective view of the pump jack pole of the present invention utilized as part of a scaffolding arrangement;
Fig. 2 i5 a perspective sectional view of a part of the pump jack pole according to the present invention;
Fig. 3 is an exploded perspective view of the metal tubing and a rubberized strip of a section of the pu~p jack pole of Fig. 2;
Fig. 4 is a perspective view of the pump jack poie s~ction with a joint portion of the rubberized strip extended beyond the pole section;
Fig. 5 is a cross-sectional view taken along line 5-5 of Fig. 4;
Fig. 6 is a detail 6 of Fig. 5, on an enlarged scale; and Fig. 7 is a perspective view of two adjacent pump jack pole sections joined together.
DETAILED D~SCRIPTION OF ~HE P~EFERRED_EMBODI~
Referring now to FigO 1, there are shown three pump jacks depicted generally at 10, 12 and 14. Such pump jacks aan be of a t:ype described in my U.S. Patent Nos.
4,413,828 or 4,597,471. Each pump jack i.s adapted to ride on an upright pole 16, 18 and 20, respectively and suppoxt a lover staging platform 22 and an upper shelf 24. The WO91/03612 1'C~/lSI)(J/()~
2 ~ 2 scaffolding is located as shown adjacent a building 26 on which a workman ~8 is operating. The poles are retained in place by means of braces 23 of a type described in my U.S.
Patent No. 4,446,945 and a cla~p 25 oi a type described in my U.S. Patent No. 4,432,435. The scaffolding can be used for various types of work on houses and buildings, for example placing aluminum or vinyl sid:ing on the house walls, painting, etc.
Referring now to Figs. 2 and 3, there is shown a pump jack pole 30 according to thé present inv~ntion, which ~omprises an elongated metal tubinq 32 of a substantially rectangular cross section to which is connected a rubberized strip or band 34. The latter is attached to only one side of the metal tubiny 32 and is interconnected wi.th the same by means which will be explained in detail below. All the aforementioned poles 16, 18 and 20 of the scaffolding arrangement of Fig. l are formed in the same manner as the pole 30.
As is known, while the pump jack is riding up and down the metal pole 30 it grabs into the rubber strip 34.
Therefore, serious consideration has been given for providing means which would ensure sufficient security for tightly holding the pump jack on the pole. It has been found that the pump jack satisfactorily operated when only a single side of the metal pole is coated with the rubberized surface so that the pump jack would bite into the rubberized surface and grab the same as it moves up and down. Metal tubing 32 may be formed of aluminum extrusion of a substantially rectangular configuration.
As best seen in Fig. 3 as well as in Figs. 5 and 6, the side of ~he metal tubing 32 to which rubber strip or band 34 is attached, is formed with a plurality of parallel outwardly extending elon~ated protrusions or ribs 40 each having a rounded enlarged head portion 42 of substantially ~-'091/03612 1'Cr/~;S9()/i)~
2~7~2 6 semi-cylindrical configuration and c~ connesting or neck portion 44 which connects head portion 42 with a faciny wall 46 of the aluminum tubing 32. Head portion 42 of each rib may typically be about .250" in dia~leter and about 0.l72" in height whereas the neck portion may be about .125" in width and about 0.78" in height for the tubing side wall being about 2 /8" wide. The spacing between the ribs or protrusions 40 formed on the facing wall 46 of the tubing may be about .625" for the aforementioned wall width. All these dimensions would be with normal tolerances. The strip 34 of rubber is formed with a plurality of parallel complementarily-configured elongatPd grooves or recesses 50 each having, respectively, an enlarged portion 52 which receives the head portion~42 and a narrow portion 54 formed by two opposing inwardly extending arms 56, 58 which face each other to engage and grasp therebetween the neck portion 44 of the respective rib 40.
Strip 34 which may be made of any suitable resilient elastomeric material is simply pressed onto the facing wall of the aluminum tubing 32 of the pole whereby the ribs 40 and recesses 50 are interdiyitated with each other thus providing a reliable and secure connection between the pole tubing 32 and strip 34. As the strip 34 is pressed onto the pole facin~ wall, the two opposite arms 56, 58 of each groove or recess tightly clamp around the neck portion 44 of each rib with some slight spacing allowed around the head portion 42 of each rib. The rubber strip 34 may be made of a rubberized belting material. In any event, the rubber strip is easy and relatively inexpensive to make from a continual band which is cut to desired lengths.
Although it is possi.ble to add a rivet 60 at the top and the bottom of each pole section (Fig. 7) as an extra precaution in order to prevent sliding between the rubber and the metal pole, such rivets are not a necessity and the interengayed - "
,, . , . , , , .
~091/03612 2 ~ ~ ~ 7 ~ 2 ~cr/~is~o/() ~
ribs and complementary receiving grooves or recesses provided on the two facing walls of the metal tubing and -the strip are sufficient to support the weight of an individual operating the pump jack as shown in F.ig. l. No adhesive is necessary between the rubberized stri]? and the metal pole tubin~.
It should be appreciated that opposing arms 56 and 58 formed at each groove 50 act on the neck portion 44 of each rib e~gaged therebetween in a transversal direction.
In this way sliding in the vertical direction of the rubber 34 relative to the metal pole 32, which can be caused by the worker's weight, is totally prevented even without utilization of rivets or any other fasteners. Furthermore, the rubber does.not peel off the pole~ This is a rather surprising result since the entire weight of the workers must be held by the rubber and its interconnection to the pole. It would have been thought that the weight of the worker would either cause the rubber to slide down the pole or peel off the pole. However, with the gripping of this interdigitated relationship, the rubber remains in place and supports the weight of the workers.
Figs. 3 and 4 illustrate one pole section 62 of the pump jack pole whereas Fig. 7 shows a ~oint 63 of two interconnected pole sections 62 and 64. As shown in the drawings, the pole section 62 is formed as a male portion having a rubberized surface 66 which extends past the end 70 of the pole 62 to provide a flap 72. The other pole section .
64 similarly contains a rubberized surface 74. This rubberized surface 74 represents the female end and terminates in spaced relationship from the end 76 of the pole 64. In fact, each pole i5 formed with a male and female end.
When the two pole sections 62, 64 are connected, t~e exposed flap 72 of pole 62 will overlie and can be .
~091/03612 PCr/1S~0/()~
2~7~
s pressed on-to the female end 74 of the adjacent pole 64.
This will cause tne flap 7~ to interlock with the corresponding V-shaped edge 77 of the rubberized surface 74 along a joint line 78. In order to provide a suitable joint at the rubberiæed surface, the jolning edyes are matingly beveled so that they will interfit with each other. The grooves of the flap 72 will be pressed onto the exposed ribs at the end 77 of the adjacent end. This will provide a smooth and planar rubber face even at the junctions. To provide structural support at the junction, a joint can be inserted interiorly of the poles as described in my U.S.
Patent No. 4,382,488.
In order to provide for a suitable interfitting of the mating edges of the rubberized surfaces, the ends can be cut at a suitable an~le. The joint edge 78 is shown in an inverted V-shaped cut. This will permit suitable interfitting of the two edges to provide a smooth joint thereacross. When ~lap 72 fits into the inverted V-shaped cut of the female rubberized strip 74 all the ribs or tongues outwardly protruding from the wall of the metal pole 32 will be overlapped by the flap 72 of the male section.
It is understood, however, that other types of angular cuts can be utilized~ such as, for example, a diagonal cut completely crossing laterally the rubberized sur~ace. Other interfitting mating joints can simply be utilized.
There has been disclosed heretofore the best embodiment of the invention presently contemplated.
However, it is to be understood that various changes and modifications may be made thereto without departing from the spirit of the invention.
.,, .,, ~
...... ....... . . .. . . .
., ' , '
Claims (13)
1. An upright pump jack pole comprising an elongated metal tubing having a rectangular cross-sectional configuration; and a resiliently yieldable elastomeric facing strip attached to one side of said tubing; said tubing and said facing strip having two abutting sides each formed with a plurality of parallel, elongated, continuous, outwardly projecting portions extending along the entire height of said pole, said projecting portions of said tubing and said facing strip abutting each other and mutually interengaging to securely connect said elastomeric facing strip to said tubing so as to prevent slippage of said facing strip along said tubing and withstand the weight of a worker operating a pump jack to move along said pole.
2. A pump jack pole as in claim 1, wherein said facing strip is comprised of a rubberized material.
3. A pump jack pole as in claim 2, wherein said facing strip is comprised of a rubberized belting material.
4. A pump jack pole as in claim 1, wherein said facing strip is comprised of a polyurethane material.
5. A pump jack pole as in claim 1, wherein said tubing is comprised of aluminum extrusion.
6. A pump jack pole as in claim 1, wherein said portions on said abutting side of said tubing are spaced-apart longitudinal protrusions and said portions on said abutting side of said facing strip are longitudinal protrusions spaced from each other by grooves complementary with and engaging said protrusions on said abutting side of said tubing.
7. A pump jack pole as in claim 6, wherein each of said protrusions of said tubing includes a neck portion adjacent to said abutting side of said tubing and a head portion outwardly extending from said neck portion and integral therewith, and each of said grooves includes a narrower portion formed by two opposing tongues tightly clamping said neck portion, and an enlarged portion receiving said head portion.
8. A pump jack pole as in claim 7, wherein said head portion is substantially semi-cylindrical.
9. A pump jack pole as in claim 7, wherein said neck portion is substantially rectangular in cross-section.
10. A pump jack pole as in claim 1, wherein said pole is comprised of a plurality of sections joined together and having the elastomeric facing strips butting with each other.
11. A pump jack pole as in claim 10, wherein the butting elastomeric facing strips are matingly beveled so that an edge of the elastomeric facing strip of one pole section overlies the edge of the elastomeric facing strip of an adjacent section.
12. A pump jack pole as in claim 10, wherein the butting ends of the elastomeric facing strips are matingly cut along an angle with respect to the axis of elongation of the pole.
13. A pump jack pole as in claim 12, wherein said angled cut is of an inverted V-shape.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US40055089A | 1989-08-30 | 1989-08-30 | |
| US400,550 | 1989-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2064702A1 true CA2064702A1 (en) | 1991-03-01 |
Family
ID=23584053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2064702 Abandoned CA2064702A1 (en) | 1989-08-30 | 1990-07-23 | Pump jack pole |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0493391A4 (en) |
| JP (1) | JPH05502276A (en) |
| CA (1) | CA2064702A1 (en) |
| WO (1) | WO1991003612A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1670798A (en) * | 1927-05-12 | 1928-05-22 | Safety Stair Tread Company | Safety tread |
| FR709700A (en) * | 1931-01-20 | 1931-08-12 | Julius Schmidt | Exchangeable plate for staircase or similar |
| US3572799A (en) * | 1969-03-24 | 1971-03-30 | Robert E Truesdell | Resilient buffer strip |
| US3777438A (en) * | 1971-08-30 | 1973-12-11 | R Brown | Ornamental protective rail |
| US4382488A (en) * | 1980-04-24 | 1983-05-10 | Carl Anderson | Pump jack poles |
| GB2125841B (en) * | 1982-07-29 | 1986-01-29 | British Aluminium Co Plc | Flooring |
| US4685368A (en) * | 1985-03-25 | 1987-08-11 | Gardner Dennis S | Band saw joint |
| US4727695A (en) * | 1986-07-24 | 1988-03-01 | Kemeny Zoltan A | Building structure shock isolation system |
-
1990
- 1990-07-23 JP JP51109690A patent/JPH05502276A/en active Pending
- 1990-07-23 EP EP19900911606 patent/EP0493391A4/en not_active Ceased
- 1990-07-23 CA CA 2064702 patent/CA2064702A1/en not_active Abandoned
- 1990-07-23 WO PCT/US1990/004143 patent/WO1991003612A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0493391A4 (en) | 1993-02-03 |
| JPH05502276A (en) | 1993-04-22 |
| WO1991003612A1 (en) | 1991-03-21 |
| EP0493391A1 (en) | 1992-07-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |